阅读说明：本技术 一种热敏性物料闭路循环吸附除湿二级干燥系统 (Thermosensitive material closed-loop circulating adsorption dehumidification secondary drying system ) 是由 程榕 董晨晨 杨阿三 郑燕萍 孙勤 李琰君 贾继宁 屠美玲 于 2020-05-29 设计创作，主要内容包括：本申请公开了一种热敏性物料闭路循环吸附除湿二级干燥系统,包括干燥器,干燥器包括第一干燥区和第二干燥区。第一干燥区顶部出气口通接有第一气固分离器,第一气固分离器的出气口依次通过第一预冷器、第一蒸发器与第二蒸发器的进气口由管路连接,第二蒸发器出气口分为两路,一路通过第一级除湿转轮的吸附除湿区、用于预热的第一冷凝器、第一循环风机和第一加热器与第一干燥区底部进气口由管路连接,构成一级干燥气体循环回路。本申请采用了两路闭路循环系统,对热敏性物料进行干燥时,即保持了其活性,又有较好的干燥效果。(The application discloses a closed-loop circulating adsorption dehumidification secondary drying system for thermosensitive materials, which comprises a dryer, wherein the dryer comprises a first drying area and a second drying area. The gas outlet of the top of the first drying area is connected with a first gas-solid separator, the gas outlet of the first gas-solid separator is connected with the gas inlet of the second evaporator through a pipeline sequentially through the first precooler, the first evaporator and the second evaporator, the gas outlet of the second evaporator is divided into two paths, and one path is connected with the gas inlet of the bottom of the first drying area through the adsorption dehumidifying area of the first-stage dehumidifying rotating wheel, the first condenser for preheating, the first circulating fan and the first heater to form a first-stage drying gas circulation loop. The application adopts two closed-loop circulating systems, so that the activity of the thermosensitive material is kept when the thermosensitive material is dried, and a better drying effect is achieved.)

1. A closed-loop circulating adsorption dehumidification secondary drying system for heat-sensitive materials is characterized by comprising a dryer (1) and a wet material feeding device, wherein the dryer (1) comprises a first drying area (I) and a second drying area (II) which are communicated with each other through a gas circuit, the wet material feeding device is used for discharging the wet materials into the first drying area (I), and a discharge hole in the side part of the second drying area (II) is communicated with a product collecting box through a star-shaped discharger; introducing gases with different temperatures and humidities into a bottom air inlet of the first drying area (I) and a bottom air inlet of the second drying area (II); the air inlet temperature in the first drying area (I) is higher than the air inlet temperature in the second drying area (II);

the gas outlet at the top of the first drying area (I) is connected with a first gas-solid separator (2), the gas outlet of the first gas-solid separator (2) is connected with the gas inlet of a second evaporator (5) for condensation through a pipeline sequentially through a first precooler (3), a first evaporator (4) for cooling and the gas inlet of the second evaporator (5) for condensation, the gas outlet of the second evaporator (5) is divided into two paths, and one path is connected with the gas inlet at the bottom of the first drying area (I) through an adsorption dehumidification area (a) of a first-stage dehumidification rotating wheel (6), a first condenser (7) for preheating, a first circulating fan (8) and a first heater (9) to form a first-stage drying gas circulation loop;

the other path of air outlet of the second evaporator (5) is connected with the air inlet of the cold blowing area (c) of the first-stage dehumidification rotating wheel (6) through a pipeline, the air outlet of the cold blowing area (c) of the first-stage dehumidification rotating wheel (6) is connected with the air inlet of the first precooler (3) through a second condenser (12), a second heater (13) and a desorption regeneration area (d) of the first-stage dehumidification rotating wheel (6) which are used for preheating, and a first regeneration fan (14) is connected with the air inlet of the first precooler through a pipeline, so that a first-stage regeneration gas circulation loop is formed.

2. The closed-loop adsorption dehumidification secondary drying system for the heat-sensitive materials as claimed in claim 1, wherein the dryer (1) is a convection dryer, a fluidized bed dryer, a box dryer or an air dryer; the inlet air drying gas in the first drying area (I) is the same as that in the second drying area (II), and air or nitrogen is adopted.

3. The closed-loop adsorption and dehumidification secondary drying system for the heat-sensitive materials as claimed in claim 1, wherein a second gas-solid separator (15) is connected to a gas outlet at the top of the second drying area (II), and a gas outlet of the second gas-solid separator (15) is connected with a gas inlet at the bottom of the second drying area (II) through a pipeline in sequence through a second precooler (16), a third evaporator (17) for cooling, a fourth evaporator (18) for cooling, an adsorption and dehumidification area (a) of a second-stage dehumidification rotating wheel (19), a third condenser (20) for preheating, a second circulating fan (21) and a third heater (22) to form a secondary drying gas circulation loop;

and the outlet of the cold blowing area (c) of the second-stage dehumidification rotating wheel (19) is sequentially connected with the inlet of the cold blowing area (c) of the second-stage dehumidification rotating wheel (19) through a second regeneration fan (25), a fourth condenser (26) for preheating, a fourth heater (27), the desorption regeneration area (d) of the second-stage dehumidification rotating wheel (19), a third precooler (28), a fifth evaporator (29) for cooling, a sixth evaporator (30) for condensing and a cold blowing area (c) of the second-stage dehumidification rotating wheel (19) through pipelines to form a second-stage regeneration gas circulation loop.

4. The closed-loop adsorption and dehumidification secondary drying system for the heat-sensitive materials as claimed in claim 1, wherein a second gas-solid separator (15) is connected to a gas outlet at the top of the second drying area (II), and a gas outlet of the second gas-solid separator (15) is connected with a gas inlet at the bottom of the second drying area (II) through a pipeline in sequence through a third evaporator (17) for cooling, a fourth precooler (37), an adsorption and dehumidification area (a) of a second-stage dehumidification rotating wheel (19), a third condenser (20) for preheating, a second circulating fan (21) and a third heater (22) to form a secondary drying gas circulation loop;

and the outlet of the cold blowing area (c) of the second-stage dehumidification rotating wheel (19) is connected with the inlet of the cold blowing area (c) of the second-stage dehumidification rotating wheel (19) through a second regeneration fan (25), a fourth condenser (26) for preheating, a fourth heater (27), a desorption regeneration area (d) of the second-stage dehumidification rotating wheel (19) and a fifth evaporator (29) for cooling in sequence through pipelines to form a second-stage regeneration gas circulation loop.

5. The closed-cycle adsorption dehumidification secondary drying system for heat-sensitive materials as claimed in claim 3 or 4, further comprising a third compressor (31) and a third throttle valve (32); the fourth condenser (26) and the fifth evaporator (29) both adopt heat exchanger structures, and the outlet of the third compressor (31) is connected with the inlet of the third compressor (31) through a hot channel of the fourth condenser (26), a third throttle valve (32) and a cold channel of the fifth evaporator (29) in sequence by pipelines to form a three-stage heat pump circulating system; and a heat exchange medium is filled in the circulating pipeline of the three-stage heat pump circulating system.

6. The closed-loop circulation adsorption dehumidification secondary drying system for the heat-sensitive materials as claimed in claim 3 or 4, further comprising a second compressor (23) and a second throttle valve (24); the third evaporator (17) and the third condenser (20) both adopt heat exchanger structures, and the outlet of the second compressor (23) is connected with the inlet of the second compressor (23) through a hot channel of the third condenser (20), a second throttle valve (24) and a cold channel of the third evaporator (17) in sequence by pipelines to form a two-stage heat pump circulating system; and a heat exchange medium is filled in the circulating pipeline of the secondary heat pump circulating system.

7. The closed-loop circulation adsorption dehumidification secondary drying system for the heat-sensitive materials as claimed in claim 3 or 4, further comprising a first throttle valve (11) and a first compressor (10); the first evaporator (4), the first condenser (7) and the second condenser (12) all adopt heat exchanger structures, the outlet of the first compressor (10) is connected with the inlet of the first throttle valve (11) through a hot channel of the second condenser (12) and a hot channel of the first condenser (7) in sequence by a pipeline, the outlet of the first throttle valve (11) is connected with the inlet of the first compressor (10) through a cold channel of the first evaporator (4) by a pipeline, and a primary heat pump circulating system is formed; and a heat exchange medium is filled in the circulating pipeline of the primary heat pump circulating system.

8. The closed-loop circulation adsorption dehumidification secondary drying system for the heat-sensitive materials as claimed in claim 4, further comprising a fourth throttle valve (35), a fourth compressor (34) and a fifth condenser (33); the second evaporator (5) and the fifth condenser (33) both adopt heat exchanger structures, and the outlet of the fourth compressor (34) is connected with the inlet of the fourth compressor (34) through a hot channel of the fifth condenser (33), a fourth throttle valve (35) and a cold channel of the second evaporator (5) in sequence by pipelines to form a four-stage heat pump circulating system; and a heat exchange medium is filled in the circulating pipeline of the four-stage heat pump circulating system.

9. The closed-loop circulation adsorption dehumidification secondary drying system for the heat-sensitive materials as claimed in claim 3, further comprising a fourth throttle valve (35), a fourth compressor (34) and a fifth condenser (33); the second evaporator (5), the fourth evaporator (18), the sixth evaporator (30) and the fifth condenser (33) all adopt heat exchanger structures; the outlet of the fourth throttling valve (35) is divided into three paths, and is respectively connected with the inlet of a fourth compressor (34) through a cold channel of the second evaporator (5), a cold channel of the fourth evaporator (18) and a cold channel of the sixth evaporator (30), and the outlet of the fourth compressor (34) is connected with the inlet of the fourth throttling valve (35) through a hot channel of a fifth condenser (33) to form a four-stage heat pump circulating system; and heat exchange media are filled in the circulating pipelines of the four-stage heat pump circulating system.

10. The closed-loop circulation adsorption dehumidification secondary drying system for the heat-sensitive materials as claimed in claim 3, wherein the air outlet pipeline of the second evaporator (5) is connected with a first liquid discharge pipe, the first liquid discharge pipe is provided with a control valve, and condensate obtained by condensation of the second evaporator (5) is discharged through the first liquid discharge pipe; an air outlet pipeline of the sixth evaporator (30) is connected with a second liquid discharge pipe, a control valve is arranged on the second liquid discharge pipe, and condensate obtained by condensation of the sixth evaporator (30) is discharged through the second liquid discharge pipe;

the wet material feeding device comprises a feeding bin, a star-shaped discharging device and a spiral feeding machine, wherein the feeding bin is connected with the inlet of the spiral feeding machine through a pipeline, and the outlet of the spiral feeding machine is connected with the material inlet of the first drying area (I) through a pipeline.

Technical Field

The invention relates to a closed-loop circulating adsorption dehumidification secondary drying system for thermosensitive materials.

Background

The heat-sensitive materials are unstable materials, and are very sensitive to drying temperature and drying time in the process of drying the materials. Since the thermosensitive material is easily decomposed, polymerized, oxidized, and the like, if the thermosensitive material is dried at a high temperature for a long time, the components thereof are seriously damaged, thereby causing a great economic loss, and the occurrence of such a phenomenon should be avoided as much as possible in industrial production. In the drying process of heat-sensitive materials, both drying temperature and drying time are very important control factors. In the prior art, methods for drying heat-sensitive materials generally include spray drying, vacuum freeze drying, hot air drying, microwave drying and the like. The spray drying can be divided into two methods of airflow type atomizer drying and high-speed centrifugal type atomizer drying, but the spray drying process of the two methods easily causes the wall sticking phenomenon, and the wall sticking materials can be deteriorated at high temperature for a long time to influence the nutritional ingredients of the product; in addition, in the spray drying process, a small amount of heat-sensitive materials are entrained in the drying tail gas in the form of dust and are finally discharged into the atmosphere to form fine haze particles in the air, so that the health of people is affected. When the heat-sensitive material is dried by adopting a vacuum freeze drying mode, the processes of pre-freezing, sublimation drying, desorption drying and the like are generally needed, although the heat-sensitive material is not easy to deteriorate in the drying process, and the nutrient content of the final product is higher; however, the vacuum freeze drying mode is adopted, so that the energy consumption in the drying process is large, the time consumption is long, the production cost is high, and the industrial large-scale continuous production is not facilitated. The heat-sensitive materials are dried by adopting a hot air drying mode, although the hot air drying time is short, the hot air drying temperature is usually relatively high, the heat-sensitive materials are easy to be subjected to surface hardening and serious drying shrinkage due to high temperature, and the heat-sensitive materials are also subjected to more deterioration due to short-time high temperature, so that certain adverse effects are generated on the nutritional ingredients of the product.

The heat-sensitive materials are dried by adopting a microwave drying mode, the drying and heating speed is difficult to control, in addition, the materials are easy to tear and even burn, and the production safety is difficult to guarantee. In addition, in the traditional drying process, the dry tail gas is usually dedusted by a gas-solid separator or a bag-type dust remover, and the dedusted tail gas is directly discharged into the atmosphere. However, the gas-solid separator or the bag-type dust collector has limited dust removal capability, and the tail gas after dust removal inevitably carries certain dust which is discharged into the atmosphere to cause pollution.

Disclosure of Invention

Aiming at the technical problems in the prior art, the invention aims to provide a closed-loop circulating adsorption dehumidification secondary drying system for heat-sensitive materials.

The heat-sensitive material closed-loop circulating adsorption dehumidification secondary drying system is characterized by comprising a dryer and a wet material feeding device, wherein the dryer comprises a first drying area and a second drying area which are communicated through a gas circuit, the wet material feeding device is used for discharging wet materials into the first drying area, and a discharge hole in the side part of the second drying area is communicated with a product collecting box through a star-shaped discharger; gas with different temperatures and humidities is introduced into the gas inlet at the bottom of the first drying area and the gas inlet at the bottom of the second drying area; the air inlet temperature in the first drying area is higher than that in the second drying area;

a gas outlet at the top of the first drying area is connected with a first gas-solid separator, a gas outlet of the first gas-solid separator is connected with a gas inlet of a second evaporator for condensation through a first precooler, a first evaporator for cooling and a gas inlet of the second evaporator for condensation in sequence, a gas outlet of the second evaporator is divided into two paths, and one path is connected with a gas inlet at the bottom of the first drying area through an adsorption dehumidifying area of a first-stage dehumidifying runner, a first condenser for preheating, a first circulating fan and a first heater to form a first-stage drying gas circulation loop;

the other path of air outlet of the second evaporator is connected with the air inlet of the cold blowing area of the first-stage dehumidification rotating wheel through a pipeline, the air outlet of the cold blowing area of the first-stage dehumidification rotating wheel is connected with the air inlet of the first precooler through a second condenser, a second heater, a desorption regeneration area of the first-stage dehumidification rotating wheel and a first regeneration fan which are used for preheating, and a first regeneration gas circulation loop is formed.

The closed-loop circulating adsorption dehumidification secondary drying system for the thermosensitive materials is characterized in that the dryer is a dryer for convection drying and adopts a fluidized bed dryer, a van dryer or an airflow dryer; the air inlet drying gas of the first drying area is the same as that of the second drying area, and air or nitrogen is adopted.

The closed-loop circulation adsorption dehumidification secondary drying system for the thermosensitive materials is characterized in that a gas outlet at the top of a second drying area is communicated with a second gas-solid separator, and a gas outlet of the second gas-solid separator is connected with a gas inlet at the bottom of the second drying area through a pipeline sequentially by a second precooler, a third evaporator for cooling, a fourth evaporator for cooling, an adsorption dehumidification area of a second-stage dehumidification rotating wheel, a third condenser for preheating, a second circulating fan and a third heater to form a secondary drying gas circulation loop;

and the cold blowing area outlet of the second-stage dehumidification rotating wheel is connected with the cold blowing area inlet of the second-stage dehumidification rotating wheel through a second regeneration fan, a fourth condenser for preheating, a fourth heater, a desorption regeneration area of the second-stage dehumidification rotating wheel, a third precooler, a fifth evaporator for cooling and a sixth evaporator for condensing in sequence by pipelines to form a second-stage regeneration gas circulation loop.

The closed-loop circulation adsorption dehumidification secondary drying system for the thermosensitive materials is characterized in that a gas outlet at the top of a second drying area is communicated with a second gas-solid separator, and a gas outlet of the second gas-solid separator is connected with a gas inlet at the bottom of the second drying area through a third evaporator for cooling, a fourth precooler, an adsorption dehumidification area of a second-stage dehumidification rotating wheel, a third condenser for preheating, a second circulating fan and a third heater which are sequentially connected with one another through a pipeline to form a secondary drying gas circulation loop;

and the cold blowing area outlet of the second-stage dehumidification rotating wheel is connected with the cold blowing area inlet of the second-stage dehumidification rotating wheel through a second regeneration fan, a fourth condenser for preheating, a fourth heater, a desorption regeneration area of the second-stage dehumidification rotating wheel, a fifth evaporator for cooling and a pipeline in sequence to form a second-stage regeneration gas circulation loop.

The closed-loop circulating adsorption dehumidification secondary drying system for the thermosensitive materials is characterized by further comprising a third compressor and a third throttle valve; the fourth condenser and the fifth evaporator both adopt heat exchanger structures, and the outlet of the third compressor is connected with the inlet of the third compressor through a hot channel of the fourth condenser, a third throttle valve and a cold channel of the fifth evaporator in sequence by pipelines to form a three-stage heat pump circulating system; and a heat exchange medium is filled in the circulating pipeline of the three-stage heat pump circulating system.

The closed-loop circulating adsorption dehumidification secondary drying system for the heat-sensitive materials is characterized by further comprising a second compressor and a second throttling valve; the third evaporator and the third condenser both adopt heat exchanger structures, and the outlet of the second compressor is connected with the inlet of the second compressor through a hot channel of the third condenser, a second throttle valve and a cold channel of the third evaporator in sequence by pipelines to form a secondary heat pump circulating system; and a heat exchange medium is filled in the circulating pipeline of the secondary heat pump circulating system.

The closed-loop circulating adsorption dehumidification secondary drying system for the thermosensitive materials is characterized by further comprising a first throttling valve and a first compressor; the first evaporator, the first condenser and the second condenser all adopt heat exchanger structures, the outlet of the first compressor is connected with the inlet of the first throttle valve through a hot channel of the second condenser and a hot channel of the first condenser in sequence by a pipeline, and the outlet of the first throttle valve is connected with the inlet of the first compressor through a cold channel of the first evaporator by a pipeline to form a primary heat pump circulating system; and a heat exchange medium is filled in the circulating pipeline of the primary heat pump circulating system.

The closed-loop circulating adsorption dehumidification secondary drying system for the thermosensitive materials is characterized by further comprising a fourth throttling valve, a fourth compressor and a fifth condenser; the second evaporator and the fifth condenser both adopt heat exchanger structures, and the outlet of the fourth compressor is connected with the inlet of the fourth compressor through a pipeline sequentially through the hot channel of the fifth condenser, the fourth throttle valve and the cold channel of the second evaporator to form a four-stage heat pump circulating system; and a heat exchange medium is filled in the circulating pipeline of the four-stage heat pump circulating system.

The closed-loop circulating adsorption dehumidification secondary drying system for the thermosensitive materials is characterized by further comprising a fourth throttling valve, a fourth compressor and a fifth condenser; the second evaporator, the fourth evaporator, the sixth evaporator and the fifth condenser all adopt heat exchanger structures; the outlet of the fourth throttling valve is divided into three paths, the three paths are respectively connected with the inlet of a fourth compressor through a cold channel of the second evaporator, a cold channel of the fourth evaporator and a cold channel of the sixth evaporator, and the outlet of the fourth compressor is connected with the inlet of the fourth throttling valve through a hot channel of the fifth condenser to form a four-stage heat pump circulating system; and heat exchange media are filled in the circulating pipelines of the four-stage heat pump circulating system.

The closed-loop circulating adsorption dehumidification secondary drying system for the thermosensitive materials is characterized in that an air outlet pipeline of the second evaporator is connected with a first liquid discharge pipe, a control valve is arranged on the first liquid discharge pipe, and condensate obtained by condensation of the second evaporator is discharged through the first liquid discharge pipe; an air outlet pipeline of the sixth evaporator is connected with a second liquid discharge pipe, a control valve is arranged on the second liquid discharge pipe, and condensate obtained by condensation of the sixth evaporator is discharged through the second liquid discharge pipe; wet material feed arrangement includes feeding storehouse, star discharger and spiral feeder, and the feeding storehouse passes through star discharger is connected by the pipe connection with the import of spiral feeder, and the export of spiral feeder is connected by the pipe connection with the material import of first dry zone.

The dehumidifying rotating wheel is divided into an adsorption dehumidifying area, a cooling area and a desorption regenerating area, and the gas is adsorbed by the adsorption dehumidifying area to obtain dry gas with lower temperature and lower relative humidity for drying heat-sensitive materials; the regeneration gas desorbs the desorption regeneration area, and the adsorption and desorption cycle is repeated, so that dry gas can be continuously obtained, the continuous operation of rotating wheel dehumidification is completed, and thermosensitive materials can be continuously dried. In order to solve the above-mentioned dust discharged into the atmosphere, this system employs a closed-loop circulation system. When the heat-sensitive material closed-loop circulating adsorption dehumidification secondary drying system is used for drying heat-sensitive wet materials, the drying process is divided into a first drying stage and a second drying stage.

The first drying stage process is as follows: after the drying gas is dehumidified by the first-stage dehumidifying rotating wheel, under the operation action of the circulating fan, the drying gas is heated and heated, then the drying gas is introduced into the first drying area to dry wet materials, and after the tail gas discharged from the top of the first drying area is subjected to gas-solid separation, the tail gas is subjected to preliminary cooling and dehumidification, enters the first-stage dehumidifying rotating wheel to be further dehumidified, and is circulated.

The second drying stage process is as follows: after the drying medium is dehumidified by the second-stage dehumidification rotating wheel, under the operation action of the circulating fan, the drying medium is heated and heated, and then is introduced into the second drying area to dry wet materials, and after the tail gas discharged from the top of the second drying area is subjected to gas-solid separation, the tail gas is subjected to preliminary cooling and dehumidification, enters the second-stage dehumidification rotating wheel to be dehumidified, and is circulated and reciprocated.

The first drying stage and the second drying stage respectively constitute relatively independent closed cycles. Different from the traditional way for drying heat-sensitive materials, the temperature and the humidity of the drying gas in the first drying stage process are not consistent with those of the drying gas in the second drying stage process: after being dehumidified by the primary dehumidifying rotary wheel, the temperature of the drying gas is 25-37 ℃, the drying gas is further heated and then is introduced into the first drying area to dry the wet material, the first drying stage is completed, and the drying speed is high; the drying gas is dehumidified and heated by the second-stage dehumidifying wheel, and then the thermosensitive material is dried, so that the activity and the drying effect of the thermosensitive material are ensured, and the moisture content is dried to meet the requirement. Compared with the traditional thermosensitive material drying system, the closed-loop circulating adsorption dehumidification secondary drying system ensures the activity of thermosensitive materials, greatly reduces the energy consumption, shortens the reaction time and completes the continuous industrial production of material dehumidification.

In the first-stage dehumidification rotating wheel and the second-stage dehumidification rotating wheel, the dehumidification area, the regeneration area and the cold blowing area of the dehumidification rotating wheel are mutually coupled, so that the dehumidification rotating wheel can continuously work, a large amount of heat-sensitive materials can be dried, the drying time is greatly shortened, and the industrial application is carried out.

Compared with the prior art, the invention has the following beneficial effects:

1. the system dries the heat-sensitive material into two relatively independent stages, wherein the first drying stage comprises a constant speed stage or a constant speed stage and a partial speed reduction stage, and the second drying stage comprises a speed reduction stage or a partial speed reduction stage. When the thermosensitive wet material is dried, the temperature of the drying gas in the first drying stage is higher than that of the drying gas in the second drying stage, so that the drying speed and the drying period in the first drying stage are fast and short. The drying gas temperature in the second stage is relatively low, and although the drying period is prolonged due to the relatively low temperature, the drying effect is affected due to the excessively high temperature, and the optimum drying temperature exists. The drying system can maximize the speed of drying the thermosensitive materials, simultaneously ensures the activity of the thermosensitive materials and the continuity of the production of the dehumidification rotating wheel, and the nutrient components and the structure of the obtained product are not damaged after the thermosensitive materials pass through the closed-loop circulation adsorption and dehumidification secondary drying system.

2. The set of closed-loop circulation adsorption dehumidification two-stage drying system adopts a method of combining the dehumidification rotating wheel with the dryer, so that the continuous work of the dehumidification rotating wheel is realized, the rotating wheel dehumidification system adopts the two-stage dehumidification rotating wheel, and the dried gas obtained through rotating wheel dehumidification has low temperature and relative humidity and can be suitable for drying heat-sensitive materials with extremely strict drying requirements.

3. Compared with the traditional method for drying heat-sensitive materials, the adsorption and dehumidification two-stage drying system also adopts a heat pump circulating system. The heat pump circulation system comprises a first drying stage and a second drying stage which are respectively independent, the heat pump circulation system of the first drying stage is composed of two heat pump circulation units, and the heat pump circulation system of the second drying stage is composed of two heat pump circulation units. The COP of the first dry stage heat pump cycle unit may reach 3.28 and the COP of the second dry stage heat pump cycle unit may reach 3.9. The heat pump circulation units in the first drying stage and the second drying stage are mutually independent, so that the heat pump circulation units arranged in the way are energy-saving, and the arrangement is compact and neat, and is convenient for connecting pipelines.

4. The closed cycle adsorption dehumidification secondary drying system recovers the energy of a cold blowing area and uses the energy in a desorption regeneration area; the closed circulation system basically does not discharge the air after drying the heat-sensitive materials to the outside, does not form haze particles, and does not influence the health of people.

Drawings

FIG. 1 is a schematic structural diagram of a closed-loop adsorption dehumidification secondary drying system for heat-sensitive materials according to the present application;

FIG. 2 is a second schematic structural diagram of a closed-loop adsorption dehumidification secondary drying system for heat-sensitive materials according to the present application;

in the figure: 1-a dryer, 2 and 15-a first gas-solid separator and a second gas-solid separator respectively;

3. 16, 28, 37-are respectively a first precooler, a second precooler, a third precooler and a fourth precooler;

4. 5, 17, 18, 29, 30-first, second, third, fourth, fifth evaporators, respectively; 6-a first-stage dehumidification rotating wheel and 19-a second-stage dehumidification rotating wheel;

7. 12, 20, 26 and 33 are respectively a first condenser, a second condenser, a third condenser, a fourth condenser and a fifth condenser;

8. 21-a first circulating fan and a second circulating fan respectively;

9. 13, 22, 27-first, second, third, fourth heaters, respectively;

10. 23, 31, 34-are respectively a first compressor, a second compressor, a third compressor and a fourth compressor;

11. 24, 32, 35-are respectively a first throttle valve, a second throttle valve, a third throttle valve and a fourth throttle valve;

14. 25-a first and a second regenerative fan, respectively;

36-axial flow fan, I-first drying area, II-second drying area, a-adsorption dehumidification area, d-desorption regeneration area, c-cold blowing area, WP-wet material, DP-dry material, CL-condensate and CA-cold air.

Detailed Description

The present invention is further illustrated by the following examples, which should not be construed as limiting the scope of the invention.