Green Bean Production Line
Green Bean production line is to a process producing bean into powder or mixing the material with other material to produce snacks foods.
Washing->Drying-> Grinding
- What’s your capacity: how many KG per hour?
- What’s process you want?
- What’s the ratio of fresh to dry material?
- How many mesh you want after grinding?
- What’s your factory space reserve?
Drying Machine for reference:
Grinding Machine for reference
Large WFM -Series Ultrafine Grinding Vibration Mill
- Production Capacity: 10-2000kg/h
- Feeding Size: ≤ 10 mm
- Crushing fineness: 80-320mesh
- Motor power: 13.37-119kw
- Machine Weight:950-5500kg
- Price: USD10,800~USD37,384.
Other Bean Production Line
Industrial Green Bean dryer machine Youtube Video
Parameters:
Design basis of high temperature heat pump unit
The heat pump unit is manufactured according to the following standards:
“Heating ventilation and air conditioning design Code” GB50019-2003
Code for Fire Protection Design of High-rise Civil Buildings, 2001 edition (GB50045-95)
“Heating Ventilation and Air conditioning Design Manual” GBJ16-87
Air Conditioning and Refrigeration Technical Manual
Heating, Air Conditioning and Refrigeration Manual
Practical Heating and Air Conditioning Design Manual
General Safety requirements for household and similar electrical appliances GB4706.1-92
Special requirements for the safety of heat pumps, air conditioners and dehumidifiers for household and similar electrical appliances GB4706.32-92
2.2 Device Configuration Calculation
1, the main structure of high temperature heat pump drying system
High temperature heat pump drying system is mainly composed of heat pump unit, temperature and humidity control system, oven box, hot air circulation and moisture removal system.
Diagram
Technical requirements for drying
| Name | Parameter | Requirement | |
| Material | Medicine | Drying quantity (fresh products) | |
| Material fresh dry ratio | 5:5 | 24h drying quantity (fresh products) | |
| Moisture content before drying | 55-40% | Drying temperature | less than 90℃ |
| Ambient temperature condition | 5-20℃ | Ambient humidity condition | |
| Machine Mode | heating method | ||
| 16 sets10P | |||
| Fresh condition | Powder | ||
| Site conditions (space conditions, electricity conditions) | 1, drying equipment: length (26 meters)x width (6 meters)x height (3.6 meters).2, plant size: length 30 meters x width 12 meters x height 6 meters (for reference only). 3, 7 layers of circulating network belt.4, power consumption 150KW per hour | ||
| Customer requirements for drying equipment | Automatic circulating hot air dryer (layer by layer air supply system). | ||
A single set of ZL-340 automatic circulating hot air dryer system making table
| NO. | Name | Specs | Unit | Quantity |
| 1 | ZL-340 Drying Line | 2.7m wide net belt, feeder, feed ramp, feed hopper, discharge conveyor, material :304 stainless steel. 2, slag tray, layer by layer air supply pipe, air return pipe, wet plate, column, track, bracket, gear, bearing, shaft, chain, frame, transmission system, material: carbon steel. 3, PLC intelligent control cabinet, material: carbon steel spray 4 Drying line network with the number of layers: 7 layers 5, in and out of the material direction: one in one out | Set | 1 |
| high temperature heat pump | 10P 7.8KW | Unit | 16 | |
| 2 | Dehumidifying fan | Power 0.25KW | Unit | 8 |
| 3 | Axial flow fan | 4# Power 0.37KW | Unit | 64 |
| 4 | Heat exchange core | 600*600 | Unit | 10 |
| 5 | Drying line making | Production, installation, commissioning | Item | 1 |
| 6 | Auxiliary materials | China Standard | lot | 1 |
| 7 | Training | Training of management and operation personnel | Item | 1 |
Trade Capacity
| International Commercial Terms(Incoterms): | FOB, CIF, CFR | Terms of Payment: | LC, T/T, PayPal, Western Union |
| Average Lead Time | 60 working days | Main Markets | North America, South America, Europe, Southeast Asia/ Mideast, East Asia(Japan/ South Korea), Australia, Domestic |
| Nearest Port: | Ningbo Port; Shanghai Port | Factory Address: | JiangSu, China |
Green Bean:
Green bean long bean, Vigna unguiculata, kidney beans.
Legume cowpea is an annual climbing plant, 2 to 4 meters long. The pod is droopy, how much it expands when it is tender, and the tender pod is used as a vegetable. The variety can be roughly white (light green), green, red and striped in color according to the pod. The seeds are reniform, 8-12 mm long; Flower and fruit in summer.
Beans originated in West Africa, and China is the secondary origin center. There are records of cowpea (i.e., cowpea) in the Tujing Materia Medica of the Northern Song Dynasty, and poems about cowpea by Su Shi. In the Ming Dynasty, cowpea was recorded in various books such as Benmin Tuzuan and Compendia of Materia Medica, showing that cowpea was widely cultivated in the Ming Dynasty. Nowadays, cowpea is cultivated in tropical and temperate areas of Africa and Asia. Beans are heat-resistant vegetables, resistant to high temperature, not resistant to frost, seeds in 25~35℃, germination faster, need good sunshine during flowering and pod, otherwise it will cause falling flowers and pods; The adaptability of bean roots to soil is wide, but it is better to have fertile, well-drained and breathable soil.
Beans are rich in protein and a small amount of carotene, vitamin B and vitamin C, is a vegetable with high nutritional value, so beans are also known as “meat in vegetables”, [9] the carbohydrates contained in beans can play a similar role to food, often eaten as the main course; Beans have the function of strengthening the spleen, stomach and kidney, the fiber in beans is conducive to reducing cholesterol in the human body, but also to strengthen gastrointestinal peristalsis and prevent constipation.
Cowpea provides easy digestion, absorption of high-quality protein, appropriate amount of carbohydrates and a variety of vitamins, trace elements and so on. Cowpea contains B vitamins to maintain normal digestive gland secretion and gastrointestinal peristalsis function, inhibit cholinase activity, can help digestion, increase appetite. The vitamin C contained in cowpea can promote the synthesis of antibodies and improve the antiviral ability of the body. Cowpea’s phospholipid can promote insulin secretion and participate in sugar metabolism, which is an ideal food for diabetic patients. How to eat: rural areas are generally simple stir-fried chili, smothered meat, fried braised meat, pot loat soup, because dry beans are highly nutritious, cold free, very warm, very suitable for female friends in the month to eat. Stir-fried food should be steamed before cooking, pot soup can be briefly soaked together pot pot.
Introduction to heat pump drying technology
There are many forms of Industrial Heat pump dryer machine, according to the circulation of the drying medium (air) can be divided into open circuit, partial exhaust gas circulation and closed circuit three, most of the closed circuit heat pump drying system as shown in Figure 2-1.
Figure 2-1 Closed circuit heat pump drying system
The closed circuit heat pump drying system has two internal and external working cycles, that is, the refrigerant circulation in the heat pump system and the drying medium drying cycle. The refrigerant in the evaporator absorbs the heat from the exhaust gas discharged by the drying system, so that the liquid evaporates into vapor; After compression by compressor, sent to the condenser; Under high pressure, the working medium of the heat pump condenses and liquefies, and the released high temperature condensing heat heats the low temperature dry air from the evaporator. After heating the low temperature dry air to the required temperature, it is discharged into the drying chamber for recycling as the drying medium. After liquefaction, the heat pump working medium is returned to the evaporator through the expansion valve, and so the cycle is repeated. At the same time, most of the water vapor in the exhaust gas is condensed in the evaporator and discharged directly.
The heat pump part of the system takes the form of an auxiliary condenser. The advantage of this structure is that it is flexible and convenient to control the drying temperature, and the auxiliary condenser has a high heat transfer coefficient, and no special technical heat exchanger is required. In addition, if the auxiliary condenser is used to heat the outside air to pre-dry the material, the condensation heat with a relatively high temperature can be recovered, saving energy and improving the efficiency of the system. The purpose of setting the bypass in the evaporator is to make the hot and humid air through the evaporator better match the cooling capacity in the evaporator, and give full play to the dehumidification ability of the evaporator. At the same time, the heat load of the condenser and evaporator can be adjusted to make it better matched to reduce loss and strengthen the heat transfer of the condenser, taking into account the respective requirements of the heat pump and the drying unit.
Characteristics of heat pump drying technology
(1) Saving energy
Saving energy is the starting point for the initial application of heat pumps and is also the main advantage. Heat pump low temperature (15 ~ 45℃) when drying wood can save 40% ~ 70% of energy consumption. The optimum temperature for drying rice is 35 ~ 50℃. The temperature is low, but it requires a lot of heat. The efficiency of the traditional dryer is only 3% to 5%, and the drying efficiency of the heat pump will be significantly improved. The cloth has strict requirements on the drying temperature, and the heat pump dryer can not only meet this requirement, but also save about 50% energy than the traditional dryer. Heat pump drying technology can save up to 90% of energy in vegetable dehydration. In recent years, more and more researchers have also confirmed the energy-saving characteristics of heat pump drying units.
(2) Good quality of dry products
Heat pump drying is a mild drying method that is close to natural drying. The evaporation rate of the surface water is close to the migration rate of the internal water to the surface, so that the dried goods have good quality, good color and high product grade. The vitamins with low retention of aromatic volatile substances, poor heat resistance and great color change were obtained by ordinary drying method. For example, the gingerol retention rate of ginger obtained by a drum dryer is only 20%, while the gingerol retention rate obtained by a heat pump is as high as 96%. Van Blarcom and Mason’s tests show that even at 50 ° C, the heat pump drying of macadamia nuts will not appear the above Browning phenomenon, and can better maintain the original color, flavor and nutrient composition of the nuts.
(3) Drying parameters are easy to control and can be adjusted in a wide range
During the heat pump drying process, the temperature, humidity and circulation flow of the circulating air can be accurately and effectively controlled, and the temperature adjustment range is -20 ~ 100℃ (with an auxiliary heating device), and the relative humidity adjustment range is 15% ~ 80%, which is suitable for the drying of heat-sensitive materials.
(4) Environmentally friendly
Material drying not only requires improving product quality and saving energy consumption, but also must be environmentally friendly. Based on the same evaluation criteria, the global warming impact of heat pumps is small compared to the CO2 released by electricity. Environmental friendliness is the advantage of heat pump drying. At present, the application of heat pump to reduce CO2 emissions is advocated abroad, and it will be further applied.
| Business Type: | Manufacturer/Factory | Main Products: | Mill, grinder, granulator, mixer, Crushing Equipment |
| Number of Employees: | 100 | Year of Establishment: | 2014.05 |
| Production Capacity | 5000Set/Year | After-sales Service: | Technical Support; on-line teach lessons |
| R&D Capacity: | ODM, OEM | Annual Output Value: | US$5 Million – US$10 Million |
| No. of R&D Staff: | 5 | No. of Production Lines: | 6 |
LK Mixer is a professional manufacturer for grinder, mixer and pulverizer. These machines are widely used in pharmaceutical, cosmetic, health care products and chemical industries. Our main product including granulating machine, grinder, mixer, dryer, etc. All mechanical products in accordance with the China GMP design requirements. And also we have other certifications such as CE, UL for motors.
Business Philosophy
“Quality is the main policy of sales” and “integrity is the principle of success” are the business philosophy of our people. We carry out one-year warranty, lifelong maintenance service, with technical consultation, with material test machine and other services, and long-term supply of equipment. Welcome new and old customers to negotiate cooperation!
Certifications:
Electric Cabinet with UL Certification
Cyclone Processor and Motors:
Spare Parts:
Small Machine Packing:
Small machine packed with export fumigation-free wooden cases, goes with bulk shipment or in container.
When packing small machines for sea shipment, it is important to take measures to ensure that the machines are protected from damage during transit. Here are some general steps that a manufacturer may follow when packing small machines for sea shipment:
- Clean and dry the machine: Before packing, the machine should be thoroughly cleaned and dried to prevent any moisture or debris from causing damage during transit.
- Disassemble the machine: If possible, the machine should be disassembled into its component parts to reduce its overall size and make it easier to pack.
- Wrap the machine in protective material: The machine should be wrapped in a layer of protective material, such as bubble wrap or foam, to protect it from scratches and impact during transit.
- Place the machine in a sturdy box: The wrapped machine should then be placed in a sturdy box that is appropriate for the size and weight of the machine. The box should be made of durable material, such as corrugated cardboard or plywood, and should be able to withstand the rigors of sea transit.
- Add packing material: The box should be filled with packing material, such as packing peanuts or air pillows, to provide cushioning and prevent the machine from shifting during transit.
- Seal the box: The box should be securely sealed with high-quality packing tape to prevent it from opening during transit.
- Label the box: The box should be clearly labeled with the machine’s name, weight, and any other relevant information, as well as the destination address and contact information.
Overall, the goal is to pack the small machine in a way that will protect it from damage during transit and ensure that it arrives at its destination in good condition. It is important to follow proper packing procedures and use high-quality packing materials to minimize the risk of damage during sea shipment.
Large Machine Packing:
Packing a large machine for sea shipment can be a complex and challenging task. However, with careful planning and attention to detail, it is possible to pack a large machine for sea shipment in a way that will ensure that it arrives at its destination in good condition. Here are some general steps that a manufacturer may follow when packing up a large machine for sea shipment:
- Clean and prepare the machine: Before packing, the machine should be thoroughly cleaned and prepared. All fluids, such as oil or coolant, should be drained, and any loose or detachable parts should be removed.
- Disassemble the machine: If possible, the machine should be disassembled into its component parts to reduce its overall size and make it easier to pack. Each part should be carefully labeled and numbered to ensure that it can be easily reassembled at the destination.
- Protect delicate parts: Delicate or fragile parts should be wrapped in protective material, such as bubble wrap or foam, to protect them from damage during transit.
- Build a custom crate: A custom crate should be built around the machine to provide a secure and sturdy enclosure. The crate should be made of durable material, such as plywood, and should be designed to fit the machine snugly. The crate should also include braces or supports to prevent the machine from shifting during transit.
- Add cushioning material: The crate should be filled with cushioning material, such as packing peanuts or air pillows, to provide extra protection and prevent the machine from moving or shifting during transit.
- Securely fasten the machine: The machine should be securely fastened to the crate to prevent it from moving or shifting during transit. This may involve using straps, bolts, or other fasteners to hold the machine in place.
- Seal and label the crate: The crate should be securely sealed with high-quality packing tape, and should be clearly labeled with the machine’s name, weight, and any other relevant information. The destination address and contact information should also be clearly marked on the crate.
Overall, packing a large machine for sea shipment requires careful planning and attention to detail. It is important to use high-quality materials and follow proper packing procedures to ensure that the machine arrives at its destination in good condition. A professional packing and shipping company may be consulted to ensure that the machine is properly packed and prepared for sea shipment.
Customer Side Machine Groups Showcase Videos:
Dust Collector Shipment
Shipment – Packing Method
Two Large Industrial Grinder Ready to Ship
Shipment Show Case:
Operation Instruction
General Provisions
The operation instructions for a commercial grinder may vary depending on the specific model and manufacturer. However, here are some general guidelines that may apply to many high speed grinders:
- Safety precautions: Before operating the high speed grinder, it is important to review all safety precautions and warnings provided in the user manual. Safety precautions may include wearing appropriate personal protective equipment, such as eye protection and hearing protection, and avoiding loose clothing or jewelry that could become caught in the grinder.
- Preparation: The high speed grinder should be placed on a stable and level surface, and all necessary components should be assembled according to the manufacturer’s instructions. The grinder should also be connected to a power source that is appropriate for its voltage and wattage.
- Loading the grinder: The material to be ground should be loaded into the grinder according to the manufacturer’s instructions. Overloading the grinder may cause damage to the machine and result in poor grinding performance.
- Starting the grinder: The grinder should be started according to the manufacturer’s instructions. This may involve pressing a button, turning a dial, or flipping a switch. The user should ensure that their hands are clear of the grinder and that the material to be ground is positioned properly.
- Adjusting the speed and settings: The speed and other settings of the high speed grinder may be adjusted according to the material being ground and the desired outcome. The user should follow the manufacturer’s instructions for making adjustments to the grinder.
- Monitoring the grinding process: The user should monitor the grinding process to ensure that it is progressing smoothly and that the material is being ground to the desired size and consistency. Any issues or abnormalities should be addressed promptly to prevent damage to the machine.
- Shutting down the grinder: When the grinding process is complete, the grinder should be shut down according to the manufacturer’s instructions. The user should ensure that the machine is completely stopped and that all moving parts have come to a complete stop before attempting to clean or service the grinder.
Overall, the operation instructions for a commercial grinder may involve a number of steps and safety precautions. It is important to carefully review the manufacturer’s instructions and follow proper operating procedures to ensure safe and effective use of the machine.
Preparation Work
Before running a commercial grinder, there are several important preparation steps that should be taken to ensure safe and effective operation of the machine. Here are some general guidelines for preparing to run a high speed grinder:
- Read the user manual: The first step in preparing to run a high speed grinder is to carefully read the user manual provided by the manufacturer. The user manual will provide important information about the specific model of grinder being used, including its features, specifications, and safety precautions.
- Select the appropriate grinding wheel: The grinding wheel used in a high speed grinder should be selected based on the material being ground and the desired outcome. It is important to use the correct type of grinding wheel to prevent damage to the machine and ensure optimal grinding performance.
- Inspect the grinder: Before running the grinder, it is important to inspect it for any signs of damage or wear. The user should check for loose or missing components, cracks or other signs of damage to the machine’s housing or other parts, and any other issues that could affect the grinder’s operation.
- Install the grinding wheel: The grinding wheel should be installed according to the manufacturer’s instructions, making sure that it is securely fastened and aligned properly. The user should also check the wheel for any cracks or other signs of damage before installation.
- Secure the workpiece: The workpiece to be ground should be securely clamped or held in place before starting the grinder. This will help to ensure safe and effective operation and prevent the workpiece from becoming dislodged or damaged during grinding.
- Connect the power source: The high speed grinder should be connected to a power source that is appropriate for its voltage and wattage. It is important to use a properly grounded power source to ensure safe and reliable operation of the machine.
- Test run: Before beginning actual grinding operations, it may be useful to perform a test run to ensure that the grinder is functioning properly and that the grinding wheel is aligned and balanced properly. The user should follow the manufacturer’s instructions for performing a test run.
By following these preparation steps, users can ensure safe and effective operation of a high speed grinder and achieve optimal grinding results.
Treatment of inspection
Inspection of a commercial grinder is an important maintenance procedure that helps ensure safe and effective operation of the machine. Here are some general guidelines for inspecting a high speed grinder:
- Disconnect power source: Before performing any inspection or maintenance on a high speed grinder, the power source should be disconnected to prevent accidental startup.
- Check for wear and damage: The user should inspect the grinder for any signs of wear or damage, such as cracks in the housing, worn or damaged grinding wheels, or loose or missing parts. Any issues should be addressed promptly to prevent further damage to the machine.
- Check alignment and balance of grinding wheel: The grinding wheel should be inspected for proper alignment and balance, as these factors can affect the quality of the grinding operation. If the grinding wheel is not properly aligned or balanced, it should be adjusted or replaced as necessary.
- Check for proper lubrication: The high speed grinder should be inspected for proper lubrication, as inadequate lubrication can cause excessive wear and damage to the machine’s moving parts. The user should follow the manufacturer’s instructions for lubrication, and add lubricant as necessary.
- Inspect electrical components: The electrical components of the high speed grinder, including the wiring, switches, and control panel, should be inspected for any signs of wear, damage, or loose connections. Any issues should be addressed promptly to prevent electrical problems.
- Test run: After completing the inspection, it may be useful to perform a test run of the high speed grinder to ensure that it is functioning properly and that any issues have been addressed.
By following these inspection guidelines, users can help ensure safe and effective operation of a high speed grinder and minimize the risk of damage or injury during grinding operations.
Operation Attention
Running a commercial grinder can be a dangerous operation if proper precautions are not taken. Here are some general guidelines for safe operation of a high speed grinder:
- Personal protective equipment: The user should wear appropriate personal protective equipment, such as safety glasses, hearing protection, and gloves, to prevent injury from flying debris, noise, and contact with the grinding wheel.
- Secure workpiece: The workpiece being ground should be securely clamped or held in place to prevent it from becoming dislodged during grinding.
- Use proper grinding wheel: The user should select the appropriate grinding wheel for the material being ground and ensure that it is installed correctly and securely. The grinding wheel should be inspected for cracks or other damage before use.
- Adjust grinding wheel speed: The speed of the grinding wheel should be adjusted according to the manufacturer’s instructions to ensure optimal grinding performance and prevent damage to the machine or workpiece.
- Avoid excessive pressure: The user should avoid applying excessive pressure to the grinding wheel, as this can cause the wheel to overheat and wear out more quickly.
- Avoid overheating: The high speed grinder should not be operated continuously for extended periods of time, as this can cause overheating and damage to the machine.
- Monitor grinding operation: The user should closely monitor the grinding operation to ensure that the workpiece is being ground properly and that the grinding wheel is functioning correctly.
- Disconnect power source: After completing grinding operations, the power source should be disconnected to prevent accidental startup.
By following these guidelines, users can operate a high speed grinder safely and effectively, and achieve optimal grinding results. It is important to follow the manufacturer’s instructions and all applicable safety regulations when operating any type of machinery.
Installation Layout:
Application examples of heat pump drying technology
(1) Tobacco drying
Aiming at the problems such as the quality of tobacco curing in China and the defects of current domestic energy-saving baking facilities, the research team of Hangzhou Zhenheat-resistant Equipment Co., Ltd. has developed a high temperature heat pump tobacco automatic drying system for nearly ten years, which has been promoted and applied in tobacco, edible fungi, crop baking and other fields. The equipment has obtained the national invention patent, and the thermal efficiency ratio of the testing equipment reaches 1∶3 ~ 5). The tobacco curing monitor developed by the company has obtained the national utility model patent, adopts the digital temperature sensor, the accuracy is up to 0.1℃, and has a variety of built-in baking “expert system”, and has the online adjustment function, which can realize the automatic control of temperature and humidity of tobacco curing under different ecological conditions.
Since 1998, this project has studied the main physiological and biochemical changes affecting the curing process of tobacco leaves and their relationship with the curing environmental conditions, revealing the essence of the formation of curing quality of tobacco leaves. The research and development of heat pump flue-cured tobacco drying system suitable for China’s national conditions, condensing and dehumidification of dense curing room and its automatic control equipment, the highest thermal efficiency ratio of about 5, stable baking performance, can effectively and accurately achieve the baking process requirements of the indicators, to ensure the internal and appearance quality of tobacco, drying 1kg of dry tobacco consumption is only 1kW/h, the process pollution reaches zero emissions. With China’s power supply gradually reaching a rich degree, this technology has broad application prospects.
(2) Drying of wood
Wood drying is one of the most successful applications of heat pump drying technology. Although drying wood with heat pump technology takes more time than conventional air drying, the significant energy saving effect and high drying quality make heat pump drying technology one of the main means of wood drying processing, especially suitable for those with high commercial value and difficult to dry “precious wood”. In recent years, Beijing Forestry University has been committed to the theoretical research of wood heat pump drying (1992, Zhang Biguang; 1996, Zhang Biguang), has accumulated a lot of experimental data and practical experience, and in actual operation, the energy saving effect and drying effect are ideal.
(3) Drying of grains
Grain drying is one of the main research and application fields of heat pump drying technology. The United States experimented with air/air heat pumps for grain drying in 1950. The actual field test shows that the water removal rate of the electrothermal drying grain is about 1.1 kg/kW·h, and the water removal rate of the heat pump drying grain is about 1.8 kg/kW·h, and the latter is about 40% less than the former energy consumption. At present, heat pump drying technology in developed countries such as the United Kingdom and Germany has been widely used in grain drying practice.
(4) Drying of tea
Using heat pump to dry tea, energy consumption per ton of tea is about 1250kW·h(equivalent to 0.45t standard fuel); Flue gas or hot air drying tea consumes about 1833 kW·h per ton of tea (equivalent to 0.66 t standard fuel), which is about 32% energy savings. At the same time, it can control the best temperature state, improve product quality, and prevent excessive drying of tea. Using heat pump drying technology, the loss of soluble tannic acid can be reduced by 1%-13%.
(5) Seed drying
The low temperature drying characteristics of heat pump drying technology are more suitable for seed drying. The relevant researchers used heat pump drying machines to dry corn, soybean, rice and Chinese cabbage seeds respectively.
Professor Ma Yitai of Tianjin University confirmed that heat pump drying is a good seed drying method through the experiment of heat pump drying seeds, which can ensure the drying quality of seeds, improve the drying temperature, reduce the relative humidity of dry air, reduce the initial moisture content, and shorten the drying time. When the dry air flow rate is low, the dry air flow rate has little effect on the drying rate. The germination rate and healthy germination rate of Chinese cabbage seeds are most affected by drying temperature. It is recommended that the drying temperature of Chinese cabbage seeds should not exceed 40℃. When conditions permit, the hot drying can be performed by intermittent drying with double drying chambers and lower temperatures, thereby improving the drying quality of the seeds.
(6) Drying of food
More and more attention has been paid to the application of heat pump drying technology to the drying of food materials. On the one hand, in the past, the drying of heat-sensitive materials such as food was generally freeze-dried, but the drying cost was too high; On the other hand, the drying conditions of heat pump drying are mild, the drying parameters are easy to control, and the products with similar freeze-drying quality can be obtained. When the heat pump dries food materials, the drying temperature can be adjusted within the norm of -20 ~ 60℃, and the appropriate control method is used. The heat pump drying system can achieve freeze-drying under normal pressure. Chua et a1. (2000) They applied the two-stage evaporation heat pump drying system designed by themselves, and set different drying medium temperatures according to different agricultural products, resulting in good product quality, and the loss of color and vitamin C in the whole drying process decreased by 87% and 20% respectively. In recent years, the application of heat pump drying food materials at home and abroad is shown in Table 2-1.
Table 2-1 Food products dried by heat pump
| Researcher | Drying object | Research Result |
| Chua et al.(1998)Chua et al.(2000)[Singapore] | Aquatic products, seafood, mushrooms, fruits, oysters | Product quality is improved |
| Prasertdan et al(1998)[Thailand] | Banana | Suitable for heat pump drying and low operating costs |
| Gongli Zhaoxihe（2004）[China] | Grain | Find out the best drying conditions of heat pump under the premise of ensuring the quality of rice supplies |
| Mcyer and Greyvcostein(1992)[South Africa] | Grain | There is a minimum drying time that makes drying the most economical |
| Fumaoling Zhangjiqin (2001)[China] | Vegetables (Vegetable dehydration) | Energy saving 90%, good product quality |
| Stro and Kranner(1994)[Norway] | Seafood (fish) | Heat pump drying can very well maintain the product’s porosity, complex water, texture and color |
Drying principle of high temperature heat pump
Heat pump drying equipment is composed of heat pump system and hot air drying circulation system. The heat pump system provides high temperature heat source for the hot air drying system and reduces the humidity of the hot air. To supplement the lost heat of the system, the hot air drying system, through the circulation of hot air and direct contact with the material, to provide evaporating water heat, take away the water in the material. The so-called “heat pump” is an energy-saving device that consumes a certain amount of mechanical work, absorbs low-grade heat energy in the environment or waste, and improves it to become available heat energy. Just like the “pump”, a certain amount of mechanical work is used to raise the water from a low level to the required level.
A heat pump system consists of a compressor, a condenser, a throttling device, and an evaporator, as shown in Figure 5-1. The working medium running in the system absorbs the heat in the drying chamber to discharge the hot and humid air in the evaporator, evaporates from the low-pressure liquid working medium into low-pressure steam, and becomes the steam of high temperature and high pressure by the compressor; In the condenser, the high-temperature and high-pressure working medium steam releases heat to heat the air entering the drying chamber, and the working medium itself condenses from the gas into a high-pressure liquid; Through the throttling device, the liquid working medium produces a blocking effect, reduces the pressure and temperature, becomes a low-pressure low-temperature liquid, and re-enters the evaporator to absorb the heat of the hot and humid gas, so that the low temperature heat is transmitted to the high temperature medium through repeated cycles, forming a heat pump cycle.
Figure 5-2 shows the hot air flow of the hot air drying circulation system. The gas discharged from the drying chamber is a hot and humid gas with a high moisture content. Its state is at point A in the h-d figure shown in Figure 5-3, and its relative humidity is about 70 ~ 80%. When passing through the evaporator of the heat pump, the surface temperature of the evaporator is lower than the dew point temperature of the air, which not only reduces the temperature of the air but also condenses the water vapor on the surface of the evaporator. It is discharged from the system as liquid water. The gas leaves the evaporator and becomes low temperature and wet. At point b in Figure 5-3, the relative humidity is generally in ψ=95-97%. The dehumidified gas is heated isohumid in the heat pump condenser, which increases the gas temperature and reduces the relative humidity at the same time. Point C in Figure 5-3 becomes a dry hot gas and enters the drying chamber. In the drying chamber, the dry hot gas is in direct contact with the material to be dried, providing the heat of the material drying, and also taking away the water. The air in the drying chamber is in the process of isoenthalpy humidification and cooling, and returns to point a in Figure 5-3 when it leaves the drying chamber. As can be seen from Figure 5-3, water △d = da-dc can be removed per kilogram of gas through one cycle.
From the above heat pump drying principle, the difference with the general drying process is that there is no wet and hot gas emissions, through the two closed circulation system, the water in the material is eventually eliminated as liquid water. There are two advantages to adopting this principle:
(1) Energy saving: in heat pump drying. The sensible heat and latent heat are recovered without discharge of moist and hot gas, and the lost heat is supplemented by solar energy, which only consumes a certain mechanical work.
(2) No pollution to the environment: Because the heat pump drying is carried out in a closed environment, no toxic and harmful gases are produced in the drying process, and the pollution to the surrounding environment can be reduced to the lowest level.
Comparison of principle of ordinary drying unit and dehumidification drying unit
The main principle of heat pump used in the drying process is to use the heat pump evaporator to absorb the heat in the outside air, or to recover the waste heat of the exhaust gas during the drying process, through the compressor to do work, the energy is transported (transferred) to the drying box, the hot air in the drying box after repeated cycle heating, absorbing the moisture in the material, cooling and humidifying itself. After hot air dehumidification or condensation dehumidification, the water in the material is discharged and taken away, and finally the continuous drying of the material is achieved.
Characteristics of heat pump technology drying
- (1) Low energy consumption – the heat pump drying device can recover the sensible heat and latent heat of hot and humid air in operation, and the energy is fully and rationally utilized, which is a recognized high-efficiency and energy-saving equipment.
- (2) Does not pollute the environment – because the whole process of heat pump drying is carried out in a closed system, there is no need to discharge humidity to the surrounding environment, and at the same time, it will not discharge toxic and harmful gases. If the inlet and outlet system is completely enclosed in the pipeline, the entire operation will maintain a clean environment. This is a unique advantage over other drying methods.
- Good drying quality – the drying medium in the heat pump drying device is circulated in a closed space; It is not affected by external climate conditions, and runs smoothly under the same conditions all year round, so it can ensure the consistency of dry quality.
Customize according to your request:
- Can connect with packing Machine, sealing machine, Drying Machine, Sifter Vibrating Screen machine, or any other machines in procedure;
- Connector with other machines can be customized.
- Capacity can be customized;
- Procedure progress can be customized;
- Voltage can be customized;
- Special functions can be customized;
- Chargers and cables length can be customized;
- Electric cabinet can be customized;
- Logos, package can be customized, OEM your brand;
About LKMixer
LKMixer is a professional manufacturer for fertilizer production line, grinder, mixer and granulator, shredder. These machines are widely used in food, pharmaceutical, cosmetic, health care products and chemical industries. The Food materials like Peanut, mushroom, seeds, potato, bean, tobacco, salt, cannabis, tea, Sugar, corn, Coffee, rice, pepper, grain as so on. Grinders have many types such as Pulse Dust Grinder which suitable for zero pollution environment, Turbine Mill which is suitable for coffee bean, 12-120mesh all can meet, Ultrafine Grinding Mill covers 80-200mesh, and also Winnowing Dust Grinder or other grinding machines like SF Hammer. Welcome to contact us for details. Contact us for more information. Proposal, catalog, quotation. Mobile/WhatsApp: +86 18019763531 Tel: +86 21 66037855 Email: sales@lkmixer.com
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Mushroom Production Line Customization Solution:
Drying Machine + Grinding Machine + Sifter Machine + Mixing Machine + Packing Machine:
Production Line Customization Videos(See More Videos):
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