CN102914138B - Internally-arranged air blower oast based on humidity control - Google Patents

Abstract

The invention discloses a drying room with a built-in fan based on humidity control for materials that are not suitable for flow, including a heat preservation wall, an air circulation system, a heating system, a material loading system, and a temperature and humidity control system; the drying room is based on variable temperature drying technology. In combination with the humidity control drying technology, the moisture content of the air inside the drying room varies between 20-90g/kg dry air, and the temperature of the heating system varies with the drying state of the material within 20-80°C. The invention has the advantages of simple structure, uniform temperature and humidity distribution at each point inside the drying room, significantly reduced drying energy consumption, good preservation of nutritional components and color of materials, and guaranteed quality after drying. The invention has strong adaptability to materials and is suitable for drying most agricultural products.

Description

A drying room with built-in fan based on humidity control

technical field

The invention belongs to the technical field of drying, and particularly relates to a drying room with a built-in fan based on humidity control for materials that are not suitable for flow.

Background technique

The traditional drying room achieves the effect of turbulence by setting up one or more rows of agitating fans on both sides of the wall, but it cannot ensure that the temperature and humidity of the materials in the front and rear, upper and lower sides of the material cart are uniform, so it is derived from arranging plates, turning fruits, The necessary but time-consuming and labor-intensive manual operations such as leaving the house are inefficient, long drying time, high energy consumption and production costs, and will inadvertently cause a certain amount of artificial pollution.

Place two or more axial flow fans as an air circulation unit in the middle of the drying room, and combine with the air deflector to form an air circulation loop, which can ensure the consistency of temperature, humidity and wind speed at different positions of the materials in the left and right feeding carts , At the same time, the air circulation system adopts continuous or intermittent work mode, which improves the uniformity of material drying. When the humidity values at different monitoring points inside the drying room differ by a maximum of 3%, multiple axial flow fans together form a circulation loop to form a pulsating mass transfer process of drying-slowing-drying-slowing-drying, which not only ensures drying It is more uniform and also reduces energy consumption. In the drying process, the fluid quality control method and the humidity control theory are used to combine the variable temperature drying technology with the humidity control drying technology. On the one hand, it can make full use of the moisture absorption capacity of the heating medium, inhibit the crusting on the surface of the material, and promote the escape of internal moisture. On the other hand, it can greatly enhance the heat transfer efficiency of the medium and improve the convective heat transfer coefficient, so that the time for the material to reach the final moisture content is greatly reduced, saving energy consumption, and avoiding reversing and drying Wait for time-consuming and labor-intensive operations to improve the drying efficiency of the drying room.

In most current patents on the structure of the drying room, the hot air is heated by the radiator installed on the inner wall of the drying room and disturbed by the upper rotating fan. Although the structure of the drying room disclosed in Chinese patent 200720076299.4 can achieve precise temperature control, it cannot achieve the consistency of the temperature and humidity of the drying room environment in different positions, so that the uniformity of the drying process cannot be guaranteed, and the drying time is too long. Material quality is not uniform.

Contents of the invention

The purpose of the present invention is to overcome the existing problems in the drying process of materials that are not suitable for flow in the drying room of the prior art, and to provide a drying room with built-in fans based on humidity control in combination with variable temperature control drying technology and humidity control drying technology. Simple, can ensure the uniformity of the material drying process, low drying cost and energy consumption, short drying time, good shape and quality after drying, clean production process, environmental protection, strong adaptability to materials, etc., so as to meet modern industrialization production and development requirements. A drying room with a built-in fan based on humidity control, which is composed of an air circulation system, a heating system, a material loading system, a temperature and humidity control system, and a thermal insulation wall 2. The drying room is based on the temperature control drying technology and combines the Humidity control drying technology, and with the change of air moisture content inside the drying room, the temperature of the heating system also changes. The air velocity inside the drying room is 0-20m/s, and the air humidity content is 20-90g/kg dry air The heating system varies with the drying state of the material within 20-80°C. The humidity control drying technology includes: (1) During the entire drying process of the drying room, the moisture is not discharged in the early stage of drying, and the moisture is forced to discharge after the air moisture content increases to a set value between 20-90g/kg dry air , the air moisture content keeps decreasing, and when the set equilibrium point is reached, the moisture discharge stops, and the moisture content in the drying room continues to increase. After entering the next drying stage, the air moisture content and the set parameters of the equilibrium point are compared with the previous stage. (2) The air circulation system inside the drying room adopts a continuous or intermittent working method. When the humidity values of different monitoring points inside the drying room differ by a maximum of 3%, two or more axial flow The fans form an air circulation loop to equalize the temperature and humidity at various points inside the environment.

The air circulation system includes one or more air circulation units, and each unit is composed of two or more axial flow fans 12 and air deflectors 6, the axial flow fans 12 are placed in the middle of the drying room in parallel, and the air deflectors 6 Close to the heat dissipation pipe 5 and fixed to the position of the fan, the wind deflector 6 is composed of a baffle 10 and a bracket 9;

The heating system includes a heat dissipation pipe 5, a heater device 17, a pressure pump 16, a heating medium and a heating medium inlet and outlet pipeline 7, and the finned heat dissipation pipe 5 stands on the inner side of the left and right walls, and is respectively connected with the inlet and outlet pipelines 7, The pressure pump 16 is connected to the heater device 17;

The material loading system is composed of a material trolley 3 and a guide rail 11. The material trolley 3 is horizontally placed on the guide rail 11 in the drying room and arranged symmetrically from left to right. The material trolley 3 is welded to the vehicle frame by a material rack 19 for loading a material tray 8 18, the caster 20 is affixed to the bottom of the vehicle frame 18;

Described temperature-humidity control system comprises temperature-humidity automatic control device 15, temperature-humidity sensor 14, air inlet 4 and exhaust fan 1, and the signal input terminal of temperature-humidity automatic control device 15 is connected with the signal line of temperature-humidity sensor 14, and signal The output end is connected to the control line of the pressure pump 16 and the exhaust fan 1. The temperature and humidity sensor 14 is inserted through the wall insulation layer to the inside of the drying room away from the heat dissipation pipe 5. The air inlet 4 is opened on the left and right walls. The exhaust fan 1 is placed on the top and communicated with the inside of the drying room.

The two or more axial flow fans 12a and 12b of the air circulation unit adopt different directions to form local positive pressure and negative pressure areas, and combined with the air deflector 6 to form an air circulation loop.

The heat dissipation pipe 5 has fins, and the installation position of the heat dissipation pipe 5 is close to the wall to ensure that the air entering the drying room by the air inlet 4 is heated immediately; In the axial flow area on the right wall that deviates from the center line of the axial flow fan 12, the moisture exhaust fan 1 located on the top of the drying room realizes forced and rapid moisture removal from the drying room when it is turned on, and automatically removes moisture through the air intake hole when it is turned off.

The air moisture content and balance point parameters in the early stage of drying should be set to avoid condensation on the surface of the material due to the material temperature being lower than the dew point temperature in a high-humidity environment. The axial flow fan 12 adopts a continuous or intermittent working mode , when the humidity values at different monitoring points inside the drying room differ by a maximum of 3%, the axial flow fans start at the same time to form a circulation loop.

The control range of the wind speed inside the drying room is 0-20m/s, the temperature control range is 20-80°C with an accuracy of ±0.5°C, the humidity monitoring range is 0-100%RH with an accuracy of ±2.0%RH.

Compared with the existing technology, a built-in drying room for fans based on humidity control with the above structural characteristics mainly has the following advantages:

1. In terms of material drying, the present invention adopts the air circulation structure in the middle of the fan, combined with variable temperature drying technology and humidity control drying technology, to ensure the consistency of temperature, humidity and wind speed at different positions of the material, so as to achieve a uniform drying process and ensure The shape and quality of the dried material.

2. In terms of production cost and energy consumption, the present invention uses the fluid quality control method and humidity control theory to guide the drying process. On the one hand, it can make full use of the moisture absorption capacity of the heating medium, suppress the crusting on the surface of the material, and promote the escape of internal moisture. On the other hand, it can greatly enhance the heat transfer efficiency of the medium and improve the convective heat transfer coefficient, so that the time for the material to reach the final moisture content is greatly reduced, saving energy consumption and reducing costs.

3. In terms of material adaptability, the present invention can adapt to materials with large differences in particle size, shape and density, and is suitable for drying most agricultural products.

Description of drawings

Fig. 1 is the front view of the structure diagram of a built-in fan drying room based on humidity control in the present invention

Fig. 2 is a top view of the structure of a fan built-in drying room based on humidity control according to the present invention, which is a sectional view of plane A-A in Fig. 1

In the figure, 1 row of tidal fans; 2 thermal insulation wall; 3 feeding cart; 4 air intake hole; 5 cooling pipe; 6 wind deflector; 7 inlet and outlet pipes; Axial flow fan; 13 heat preservation door; 14 temperature and humidity sensor; 15 automatic temperature and humidity control device; 16 pressure pump; 17 heater device; 18 frame; 19 material rack; 20 casters.

Detailed ways

The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

Figure 1 and Figure 2 are the structural front view and structural top view of the present invention respectively, a kind of drying room with built-in fan based on humidity control includes air circulation system, heating system, material loading system, temperature and humidity control system and thermal insulation wall composition .

When the axial flow fans 12a and 12b are working, the hot air flows through the impellers of the fans and accelerates to dry the materials in the feeder. The temperature of the airflow gradually decreases, and the humidity gradually increases to become a low-temperature and high-humidity gas, which is then continuously heated by the cooling pipes inside the left and right walls. , and successively guide the hot air flow back to the air in the reverse direction under the function of the air deflector, so as to realize the drying of the material on the other side under the adsorption of negative pressure, thereby completing the air circulation loop of the unit and the material drying process; at the same time, heating The system connects the heater device with the finned cooling tube through the pressure pump. When the temperature sensor detects that the airflow temperature is close to the set value of the stage, the speed of the pressure pump is controlled to suppress the flow speed of the heat transfer medium to achieve precise temperature control.

Combining the fluid quality control method and the humidity control theory, when the drying room is in the dehumidification stage, the humidity sensor detects that the internal gas humidity is higher than the stage set value, and the temperature and humidity automatic control device controls the dehumidification fan to turn on. Wherein, the air intake hole includes multiple rows, and is opened in the axial flow area deviated from the center line of the fan on the left and right walls. When the moisture exhaust fan is turned on, the external dry air enters the drying room through the air inlet under the action of the axial flow and is immediately heated under the action of the heat dissipation pipe. At the same time, the moisture exhaust fan is forced to discharge moisture outward, and the overall effect is reduced. The moisture content of the air in the drying room is controlled to complete the rapid regulation process of the air humidity in the drying room. After the transition of the dehumidification phase, the humidity of the air inside the drying room is lower than the set value, the dehumidification fan is turned off, and the air flows through the air intake holes on the left and right walls to realize automatic slow dehumidification.

The specific working process of the present invention is: 1. open the temperature and humidity automatic control device 15, set the temperature and humidity parameters of different stages, open the axial flow fan 12, the heater device 17, the pressure pump 16 and the exhaust fan 1 in turn; 2. will need to be dried The materials are evenly placed in the material tray 8 and placed on the material trolley 3; ③When the airflow temperature in the drying room reaches the preset value, push the material trolley 3 along the track 11 to the corresponding fan drying area in the drying room to ensure that the material in the material tray 8 They are all washed and wrapped by the airflow, and then the insulation door 13 is closed tightly, and the materials start to dry under the set parameters.

During the material drying process, the drying stage and temperature and humidity technical parameters are set according to the material characteristics and the psychrometric chart to ensure that the medium conducts heat transfer with a high enthalpy, and at the same time, the condensation of the material in the early stage of drying should be avoided; the temperature and humidity are automatically The control device 15 monitors and controls the opening and closing of the moisture exhaust fan 1 located on the top of the drying room and the working status of the heater device 17 and the pressure pump 16 through the sensor 14 to adjust the temperature and humidity of the airflow in the drying room; change the frequency of the motor frequency converter to adjust the axis The outlet wind speed of the flow fan 12, and work in a continuous or intermittent manner under the humidity control mode. When the humidity values of different monitoring points inside the drying room differ by a maximum of 3%, the fan is in the working state, forming a dry-slow-slow-dry-slow -Drying pulsating mass transfer process achieves the purpose of evenly heating the material and saving energy during the drying process.

The invention has strong adaptability to materials and is suitable for drying most agricultural products.

The above is only used to illustrate the technical solution of the present invention and not to limit it. Any changes or substitutions that can be easily imagined by those skilled in the art within the technical scope disclosed in the present invention shall be covered by the protection of the present invention. within range. Therefore, the protection scope of the present invention should be determined by the protection scope of the claims.

Claims (6)

1. A built-in drying room for fans based on humidity control, characterized in that: It is composed of an air circulation system, a heating system, a material loading system, a temperature and humidity control system and a thermal insulation wall (2). The temperature of the heating system also changes with the change of the air moisture content inside the drying room. The air velocity inside the drying room is 0-20m/s, the air moisture content changes between 20-90g/kg dry air, and the heating system changes between 20-20m/s Changes with the dry state of the material within 80°C; among them, The air circulation system includes one or more air circulation units, and each unit is composed of two or more axial flow fans (12) and deflectors (6), and the axial flow fans (12) are placed in the drying room in parallel In the middle part, the wind deflector (6) is close to the heat dissipation pipe (5) and fixed to the position of the fan, and the wind deflector (6) is composed of a baffle (10) and a bracket (9); The heating system includes a heat dissipation pipe (5), a heater device (17), a pressure pump (16), a heating medium and a heating medium inlet and outlet pipe (7), and the finned heat dissipation pipe (5) stands on the left and right walls The inner side of the body is connected to the inlet and outlet pipeline (7), the pressure pump (16) and the heater device (17) respectively; The material loading system is composed of a feed truck (3) and a guide rail (11). The feed truck (3) is placed horizontally on the guide rail (11) in the drying room and arranged symmetrically from left to right. The feed truck (3) is loaded with material The material frame (19) of the dish (8) is welded on the vehicle frame (18), and the caster (20) is fixedly connected to the bottom of the vehicle frame (18); The temperature and humidity control system comprises an automatic temperature and humidity control device (15), a temperature and humidity sensor (14), an air inlet (4) and a dehumidification fan (1), and the signal input terminal of the temperature and humidity automatic control device (15) is connected to the The signal line of the temperature and humidity sensor (14) is connected, the signal output end is connected with the control line of the pressure pump (16) and the exhaust fan (1), and the temperature and humidity sensor (14) is inserted into the inside of the drying room through the wall insulation At the position of the radiating pipe (5), the air inlet (4) is opened on the left and right walls, and the exhaust fan (1) is placed on the top and communicated with the inside of the drying room. the 2. according to the built-in drying room of a kind of blower fan based on humidity control described in claim 1, it is characterized in that, described humidity control drying technology comprises: (1) in the whole drying process of drying room, do not drain moisture in the early stage of drying , when the air moisture content increases to the set value between 20 ~ 90g/kg dry air, the forced dehumidification will start, and the air moisture content will continue to decrease. After reaching the set balance point, the dehumidification will stop, and the moisture content in the drying room will decrease again. Continue to increase, and after entering the next drying stage, the air moisture content and the set parameters of the equilibrium point will decrease sequentially compared with the previous stage, and this will continue until the end of the drying process; (2) The air circulation system inside the drying room adopts continuous or intermittent work In this way, when the humidity values of different monitoring points inside the drying room differ by a maximum of 3%, two or more axial flow fans form an air circulation loop to balance the temperature and humidity of each point inside the environment. the 3. The built-in drying room of a kind of fan based on humidity control according to claim 1, characterized in that, two or more axial flow fans (12a and 12b) of the air circulation unit adopt different turning directions to form local normal The pressure and negative pressure areas, combined with the wind deflector (6), together form an air circulation loop. the 4. The built-in drying room of a kind of blower fan based on humidity control according to claim 1, is characterized in that, described radiating pipe (5) has fin, and the installation position of radiating pipe (5) is close to the wall, guarantees by The air that enters the drying room through the air inlet (4) is heated immediately; the air inlet (4) includes multiple rows and is opened on the left and right walls in the axial flow area that deviates from the center line of the axial flow fan (12). The dehumidification blower (1) located on the top of the drying room realizes the forced and rapid dehumidification of the drying room when it is turned on, and automatically dehumidifies through the air intake hole when it is turned off. the 5. The built-in drying room of a kind of blower fan based on humidity control according to claim 2, it is characterized in that, the moisture content of the air in the early stage of drying and the balance point parameters should avoid that the material is in a high-humidity environment due to the temperature of the material when setting. Condensation occurs on the surface when the temperature is lower than the dew point, and the axial flow fan (12) adopts a continuous or intermittent working mode. When the humidity values at different monitoring points inside the drying room differ by a maximum of 3%, the axial flow fans start at the same time to form a cycle circuit. the 6. A humidity-controlled drying room with a built-in fan according to any one of claims 1-5, wherein the control range of the wind speed inside the drying room is 0 to 20 m/s, and the temperature control range is 20～80℃, the accuracy is ±0.5℃, the humidity monitoring range is 0～100%RH, the accuracy is ±2.0%RH. the