CN107144113A - A kind of drying system for high temperature production technology - Google Patents

Abstract

The invention is a drying system for medium and high temperature production process, which integrates the drying room and the setting room into one production workshop area, and realizes the seamless link of the product production process in the workshop. The production process and system workshop can be applied to medium and high temperature Food production process with the same drying process and drying workshop structure; it has the advantages of reducing the number of front-line workers and labor intensity, saving production costs, improving production efficiency and economic efficiency, and is characterized in that microwave auxiliary equipment is installed near the cargo entrance door. The heater pre-dries the goods, and an infrared auxiliary heater is installed near the goods exit door to re-dry the dry goods, so as to realize the medium and high temperature production of the drying system.

Description

A drying system for medium and high temperature production process

technical field

The invention relates to the technical field of drying production of food, fruits and vegetables, in particular to a drying system and production process for food, fruits and vegetables, wood and other products suitable for medium-high temperature drying process.

Background technique

At present, there are tens of thousands of food, fruit and vegetable drying production enterprises with a certain scale in the country. Less use of heat pump drying method. Natural air-drying is a backward air-drying method, which has the disadvantages of low production efficiency, perishable products, and poor hygienic conditions, which affects the quality and market value of its products. Therefore it is of great significance to invent a novel production process and system suitable for medium and high temperature drying.

The traditional drying method is open drying with blast hot air. The air is heated by a hot air stove burning fossil fuels to form hot air with high temperature, low relative humidity and strong drying capacity. The hot air blows the material under the drive of the blower. , to achieve the purpose of hot air drying. The drying workshop adopted is mainly designed for the coal-fired hot air drying method. The thawing of materials and the pre-treatment process are all manually processed, which has the disadvantages of obvious energy waste, large space occupation, and low production efficiency. In addition, the old workshop uses open air circulation to dry the products, and the quality of the products after drying has declined significantly. For these shortcomings, the present invention proposes a sizing and drying automatic workshop. The new workshop is a new workshop for medium and high temperature drying products such as hawthorn cakes using heat pump dryers. The workshop consists of two parts, the parallel heat pump control room and the drying room. After the fresh air enters from the fresh air inlet, it goes through the heat pump unit for dehumidification and heating. Then, driven by the blower, the high-temperature and low-humidity air is sent into the drying room for direct shaping and drying. The production efficiency of the new workshop is improved under the same floor space. And the closed air circulation loop is used to dry the product, the dried product has no direct contact with the outside air, and the produced product is more hygienic and safe.

After searching, the invention patent of the dried fruit drying method applied for by the application number CN201610519856 provides a dried fruit drying device, which can make the heat energy circulate evenly inside the drying chamber in the drying room and reduce the temperature difference during drying. But the latter patent is only applicable to the drying of preserved fruit in small batches, and is not suitable for the drying of large-scale products.

Contents of the invention

The task of the present invention is to overcome the shortcomings in the prior art, and to construct a new type of integrated workshop on the basis of the existing production process and the structure of the drying workshop. The drying room and the setting room are concentrated in one production workshop area. Realize the seamless link of the product production process in the workshop. The production process and system workshop are suitable for medium and high temperature food production processes with the same drying process and drying workshop structure. It has the advantages of reducing the number and labor intensity of front-line workers, saving production costs, and improving production efficiency and economic efficiency.

The purpose of the present invention is achieved through the following technical solutions:

A drying system for a medium-high temperature production process, including a heat pump unit and a drying chamber tunnel system. The drying room tunnel system includes the air supply duct, the drying room, the return air duct, the fresh air inlet door, the cargo inlet door, the cargo outlet door, the cargo shelf, the shelf adjustment door, the intermediate process door, the air supply outlet deflector, the return Air outlet deflector, thermal insulation wall, infrared auxiliary heater, microwave auxiliary heater and exhaust channel opening. The air-supply duct is a channel through which the fan sends air reaching a specified temperature and humidity into the drying chamber. Shelves for drying goods are arranged in the air-supply duct, and the dried goods are placed on the drying shelves. The return air duct is a channel for sending the air flowing through the material back to the heat pump unit, and cargo shelves are also arranged in the return air duct. The fresh air inlet door is a channel through which fresh air enters the system, and is mixed with part of the return air to achieve a suitable temperature and humidity. The goods inlet door and the goods outlet door are connected with the goods shelf guide rails to facilitate the transportation of materials after the relevant processes are completed. The cargo shelf is used for placing the materials to be dried and for transporting the materials in each process step. The shelf adjustment door is used to adjust the position of the drying shelf, and can be used as an inspection door for inspecting the passage of the exhaust fan. The intermediate process door can be used as an inspection door, and can also be used as an access channel for intermediate process goods shelves in the drying process. The deflector at the air supply port and the deflector at the return air port guide the air to reduce wind resistance, and the deflector at the air inlet redirects the air passing through the heat pump unit and guides it into the drying room. After passing through the deflector of the return air outlet, it returns to the heat pump unit to complete the next cycle. The thermal insulation wall adopts the thermal insulation board with fireproof function to reduce heat exchange with the outside world. In order to improve the drying efficiency, the infrared auxiliary heater and the microwave auxiliary heater are heat sources for auxiliary heating of the air when the temperature of the dried material is high or the moisture diffusion is slow. The infrared auxiliary heater is installed in the tunnel near the cargo exit door , The microwave auxiliary heater is installed in the tunnel near the cargo entrance door. The air exhaust passage is a passage for discharging a part of the return air out of the drying chamber, and is installed on the top of the return air outlet of the drying chamber, and the fan is used to complete the exhaust work.

The heat pump unit includes a heating section, a power room, a preheating section and an energy recovery section. The heating section mainly includes the condenser of the heat pump unit, which is responsible for heating the dehumidified air to make the air reach the temperature required for drying. The power chamber includes a compressor and a blower. The compressor is responsible for providing the power required for the refrigerant cycle. The blower is used to provide air circulation power throughout the drying room. In the preheating section, part of the heating section is installed between the power chamber and the energy recovery section to preheat the air entering the power chamber, improve the dryness of the air, and prevent damage to electrical equipment. The energy recovery section is mainly composed of the evaporator of the heat pump unit, which recovers the residual air energy of the return air, so as to achieve the function of energy recovery and improve the efficiency of the unit. The circulating air in the drying room is fresh air which enters the return air duct from the fresh air inlet and mixes with part of the return air. After passing through the energy recovery section of the heat pump unit for dehumidification, it passes through the power room and flows through the heating section of the heat pump unit for heating to reach the set value. The temperature is sent into the drying room to realize the circulation of air between the drying room and the heat pump unit.

Taking the manufacturing and drying process of hawthorn cake as an example, the content of the present invention is introduced. The manufacturing process of hawthorn cake mainly includes six parts: beating, scraping, drying, peeling, stewing, finished product processing and packaging. The beating is to mix the hawthorn with white sugar and other ingredients after being boiled, and add appropriate water and pour it into a beater to make a slurry. The scraper is to spread the adjusted pulp on the glass, and scrape it into a wet sheet with a thickness of about 1.5mm with a scraper or other tools. The drying is to put the scraped glass plate on the carrier frame, push it into the drying room through the cargo entrance door, wait for the basic fixed shape, and the surface will not stick to hands, and push the carrier frame out through the intermediate process door. The peeling process is to peel off the semi-wet cake from the glass plate, put it on the screen, and push it into the drying room with the goods rack for further drying. When the water content of the cake meets the requirements, put the goods on the shelf The rack is pushed out by the exit door. The process of stewing slices is to separate the dried cake slices layer by layer with wrapping paper, and stack them in the slice stewing chamber, so that the white sugar of the cake slices is fully melted and evenly diffused into the cake slices. Finished product processing or packaging refers to cutting and packaging the stewed pie slices into finished products. Among them, drying, peeling and stewing are the main processing techniques. Drying is the process of sending the hawthorn cake slurry on the cargo shelf to the drying workshop to remove moisture. The air inlet temperature of the drying workshop is 65~70℃. The treated air is guided into the drying chamber through the deflector to dry the hawthorn cake. Part of the dried air is discharged into the atmosphere through the air outlet, and the other part is mixed with fresh air to continue the next cycle. In the production process, after the heat pump unit is turned on, it goes through the pulping and scraping process. Place dry materials on the cargo rack, which is accessed through the cargo inlet. After the drying process, it is taken out through the middle process door to perform the peeling process. Then it is sent to the drying room by the process door to continue the peeling process. After peeling, the semi-finished hawthorn cakes are taken out from the export of goods, subjected to the stewing process, and then to the finished product processing and packaging process to complete the entire production process.

Description of drawings

Fig. 1 is a schematic diagram of a drying system of a medium-high temperature production process according to an embodiment of the present invention.

detailed description

The technical solutions of the present invention will be described below through specific embodiments in conjunction with the accompanying drawings.

An embodiment of the present invention provides a drying system for a medium-high temperature production process, please refer to FIG. 1 , including: a drying chamber tunnel system and a heat pump unit. The drying room tunnel system includes air supply duct, return air duct, air supply outlet deflector 1, fresh air inlet door 5, cargo inlet door 7, shelf adjustment door 8, exhaust air passage opening 9, return air outlet deflector 10 , Insulation wall 11, intermediate process door 12, goods shelf 13, infrared auxiliary heater 14, goods export door 15 and microwave auxiliary heater 17. The air supply port of the heat pump unit passes the air supply port deflector 1 to guide air into the air supply duct, and the air flows into the return air duct through the return air deflector 10 after drying the goods in the air supply duct. The drying room, return air duct, and air supply duct are all isolated from the external environment by the thermal insulation wall 11 . The goods inlet door 7, the goods outlet door 15, the shelf adjustment door 8 and the middle process door 12 are heat and air insulated from the outside world, and are well sealed. The goods inlet door 7 and the goods outlet door 15 are connected with the guide rails of the goods shelf 13, so as to facilitate the transportation of materials after completing related processes. The cargo shelf 13 is divided into a flat partition for drying and an iron frame shelf for peeling off, and is used for shelving the materials that need to be dried and the transportation of the materials in each process step. The shelf adjustment door 8 can be used to adjust the position of the cargo shelf. The middle process door 12 is responsible for taking out the products after the shaping process is completed, and after performing the peeling process, it is sent into the return air channel for the stewing process. The middle insulation wall 2 and the insulation wall body 11 adopt a certain thickness of insulation board to reduce heat exchange with the outside. The infrared auxiliary heater 14 is installed at the entrance of the air supply duct close to the cargo outlet door 15, and is used for auxiliary heating of materials with higher temperature required for drying to improve drying efficiency; the microwave auxiliary heater 17 is installed in the drying area near the cargo inlet door 7. inside the tunnel.

The heat pump unit is composed of a compressor, an evaporator installed in the air duct, a condenser, a preheating section 16, a liquid receiver, a dry filter, and a throttle valve. The power chamber 4 composed of the compressor and the fan also includes devices such as a liquid reservoir, a dry filter, a throttle valve, and the like. The blower is located in the power chamber 4 and provides power for air circulation. The heating section 3 is installed at the air outlet end and is composed of the condenser of the heat pump unit, which is used to heat the dehumidified air so that the temperature reaches the temperature required by the drying room. The energy recovery section 6 is installed at the inlet of the return air and is composed of the evaporator of the heat pump unit, used for energy recovery and improving the efficiency of the heat pump unit. The central control room is used to control the start and stop of the power room 4 of the whole system. The preheating section 16 is installed in the middle of the power chamber 4 and the energy recovery section 6, and is used to preheat the air entering the power chamber, improve the dryness of the air, and prevent damage to electrical equipment.

Claims (2)

1. a kind of drying system for high temperature production technology, including：Hothouse tunnel system and source pump, its feature It is that hothouse tunnel system includes supply air duct, hothouse, fresh air inlet door, return airway, import of goods door, export of goods Door, goods shelf, shelf adjustment door, middle process door, air outlet deflector, return air inlet deflector, heat-preserving wall, infrared ray is auxiliary Help heater, Microwave-assisted firing device and air exhaust passage mouthful；Air enters hothouse from supply air duct by air outlet deflector, Material is dried, source pump is returned to by a return air inlet deflector part, air reprocessed, another part air Pass through air exhaust passage mouthful discharge hothouse；Goods is placed on goods shelf, is entered hothouse from import of goods door, is adjusted by shelf After whole door, middle process door, from export of goods door submitting hothouse；Source pump include bringing-up section, power house, preheating section and Energy regenerating section；Bringing-up section is made up of the condenser of source pump；Power house includes compressor and blower fan, and compressor is responsible for offer Power required for refrigerant circulation, blower fan is used for providing the air circulation power in whole hothouse；Preheating section is by part Bringing-up section is arranged between power house and energy regenerating section, for preheating the air into power house, is improved air mass dryness fraction, is prevented Damage electrical equipment；Energy regenerating section is mainly made up of the evaporator of source pump.

2. a kind of drying system for high temperature production technology according to claims 1, it is characterized in that, microwave radiation technology Heater is arranged near import of goods door in tunnel, and the pre-dried of early stage is carried out to material；Infrared ray auxiliary heater In export of goods door nearby tunnel, the drying process in later stage is carried out to material.