CN103994652A - Thin-layer drying experimental equipment and drying technology thereof - Google Patents

Thin-layer drying experimental equipment and drying technology thereof Download PDF

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Publication number
CN103994652A
CN103994652A CN201410240579.9A CN201410240579A CN103994652A CN 103994652 A CN103994652 A CN 103994652A CN 201410240579 A CN201410240579 A CN 201410240579A CN 103994652 A CN103994652 A CN 103994652A
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valve
hothouse
hot air
air
heater
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CN201410240579.9A
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Chinese (zh)
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CN103994652B (en
Inventor
温海江
陈武东
马文军
赵妍
应卫东
许才花
孙鹏
车刚
李喜陆
候艳芳
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黑龙江省农副产品加工机械化研究所
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Abstract

The invention provides thin-layer drying experimental equipment. The equipment comprises a constant temperature and humidity machine (1), a fan (3), manual control dampers (2), a heater (5), a hot air pipeline (8), wind speed sensors (11 and 14), temperature and humidity sensors (6, 12 and 13) and valves (7, 10, 15 and 16). The constant temperature and humidity machine is installed at the air inlet initial position of the whole experimental equipment. The fan (3) is connected with the constant temperature and humidity machine (1) in a linkage mode. The manual control dampers (2) are arranged between the constant temperature and humidity machine and an air suction opening of the fan (3). The heater (5) is connected with an air outlet of the fan (3) in a linkage mode through a pipeline. The hot air pipeline (8) is led out of the air outlet of the heater (5) and connected with the two ends of a drying chamber (20) through two branches in a linkage mode. The wind speed sensors (11 and 14), the temperature and humidity sensors (6, 12 and 13) and the valves (7, 10, 15 and 16) are arranged on the hot air pipeline (8). The invention further provides a drying technology adopted for the thin-layer drying experimental equipment.

Description

Thin layer drying experimental facilities and drying process thereof

Technical field

The present invention relates to Cereals Processing Machines, relate more specifically to a kind of grain thin layer drying experimental facilities and drying process thereof.

Background technology

Along with the modern development of Tendency of Agricultural Machinery in China, after grain harvest, dry process technology is also in continuous progress, but for current comparatively extensive cooked mode, the rational drying parameter of How to choose (as medium temperature, wind speed, Grain-Layer thickness etc.) is concerning critical.China's grain machinery dry amount increases year by year, particularly the Northeast is generally annual November to March next year drying time, because environment temperature is low in the meantime, grain moisture content is high, the features such as the moisture uniformity is poor, high, the dry problems such as quality is low afterwards, moisture is restive of grain drying ubiquity energy consumption for drying.And can determine its rational drying parameter for different cereal by this thin layer drying experimental facilities, not only can address the above problem, and can automatically control based theoretical for realizing grain drying, make grain drying particularly the grain drying of extremely frigid zones reach energy-conservation, efficient, high-quality desirable job state.

Summary of the invention

The problems referred to above that exist in order to solve Grain Drying Process, main purpose of the present invention is by this thin layer drying experimental facilities, to determine under different condition reasonably the key parameter proportionings such as drying medium temperature, depth of grain layer, wind speed, thereby reduce grain drying energy consumption, improve the quality after grain drying.

For this reason, the present invention proposes a kind of thin layer drying experimental facilities, comprises the constant temperature and humidity machine of the air intake initial position that is arranged on whole experimental facilities; With the joining blower fan of constant temperature and humidity machine; Be arranged on the middle manual air register in inlet scoop of constant temperature and humidity machine and blower fan; By the joining heater of air outlet of pipeline and blower fan; The hot air duct that air outlet by heater is drawn, connected with the two ends of hothouse through two-way branch; Be arranged on the first Temperature Humidity Sensor on the hot air duct of heater air outlet one side; The first air velocity transducer and the second Temperature Humidity Sensor are arranged on one end of close hothouse on hot air duct, and the second air velocity transducer and the 3rd Temperature Humidity Sensor are arranged on the other end of close hothouse on hot air duct; The first valve, the second valve, the 3rd valve and the 4th valve installation four positions on hot air duct.

According to the preferred embodiment of the present invention, the first valve and the 4th valve installation are in the both sides of the first Temperature Humidity Sensor, be arranged in the pipeline of hot air duct, they are closed hot blast are cut off, they are opened and make hot blast through-flow, the second valve is arranged on the position near the first air velocity transducer, be positioned on the sidewall of hot air duct, it is closed and makes hot blast flow through in pipeline, its unlatching makes hot blast flow out from valve, the 3rd valve installation, in the position near the second air velocity transducer, is positioned on the sidewall of hot air duct, and its effect is identical with the second valve.

According to the preferred embodiment of the present invention, heater support is arranged on the below of blower fan and heater, and heater support is formed by angle steel seam.

According to the preferred embodiment of the present invention, hold and expect that chamber is arranged on the inside of hothouse, workbench is arranged on the below of hothouse, and LOAD CELLS is arranged between hothouse and workbench, and the two ends of hothouse are connected with hot air duct by resistant to elevated temperatures flexible link respectively.

According to the preferred embodiment of the present invention, the shell of heater and framework are that stainless-steel sheet seam forms, in-built finned electrothermal tube.

According to the preferred embodiment of the present invention, the first valve, the second valve, the 3rd valve, the 4th valve are metal hard-sealing manually-operated gate, hot air duct is become the single-pieces such as elbow, threeway, straight tube by double-deck stainless steel seam, fill silicate aluminum board heat-barrier material between two-layer corrosion resistant plate.

According to the preferred embodiment of the present invention, also comprise the data handling system of the parts of equipment being carried out to electric-control system and the pick-up transducers signal of electric power control.

According to the preferred embodiment of the present invention, appearance material chamber in hothouse is formed by stainless steel seam, holding material chamber is the diameter 200mm cylinder being formed by corrosion resistant plate seam, in cylinder, there is the volume being formed by two 20 removable or fixing order stainless steel cloth intervals, for hold different-thickness by experiment cereal, barrel is provided with round mouth with a lid, is convenient to handling by experiment cereal.Hold totally 6 of material chambers, one is that Grain-Layer thickness can regulate arbitrarily between 1-5cm, and all the other 5 is the appearance material chamber that Grain-Layer thickness is fixed as respectively 10cm, 20cm, 30cm, 40cm, 50cm, can select one of them according to different test requirements documents.

The present invention also proposes a kind of drying process of described thin layer drying experimental facilities, comprises the following steps: regulate the position of the switch of the first valve, the second valve, the 3rd valve, the 4th valve to a kind of switch combination state; Start constant temperature and humidity machine, be adjusted to desirable original air humiture; Start blower fan, and be adjusted to required wind speed by the frequency converter of manual air register or blower fan; Start heater, and set corresponding experiment air themperature; After temperature stabilization, close blower fan, open the lid of hothouse, the appearance material chamber that cereal is housed is put in hothouse, start blower fan; Regulate wind speed and hot blast temperature in hot air duct, utilize data handling system pick-up transducers signal; In dry run, shut down and change wind direction.

According to the preferred embodiment of the present invention, can realize by the switch combination of described valve the conversion of two kinds of wind directions: the first valve opening, the second valve closing, the 3rd valve opening, the 4th valve closing, at this moment the hot air flow in hothouse is to being wind direction B, and air speed value is detected by the first air velocity transducer; The first valve closing, the second valve opening, the 3rd valve closing, the 4th valve opening, at this moment the hot air flow in hothouse is to being wind direction C, air speed value is detected by the second air velocity transducer.The method can go out to apply now more two-way ventilating drying machine, subtend fan drying machine operation principle by real simulation, the time interval that converts wind direction by difference draws the influence degree to cereal drying uniformity, for dryer design provides rational wind direction transformation parameter, can improve the drying uniformity of drying machine, improve dried grain quality, shorten the drying time of cereal, greatly improve the production efficiency of existing drying machine.

This invention thin layer drying experimental facilities is mainly used in all kinds of cereal thin layer drying tests, by simulating corresponding environment, through air heat, cereal is dried, change heating-up temperature and rotation speed of fan, can obtain the influence degree of different wind speed to cereal rate of drying under constant temperature, or the influence degree of different wind-warm syndrome to cereal rate of drying under constant wind speed condition, can also hold the thickness that material chamber changes Grain-Layer by replacing, through test draw dry in cereal layer thickness optimum data, determine the rational proportion between each parameter, for actual drying machine dry different cereal under varying environment condition provides the most rational drying parameter, for design efficient energy-saving, after dry, grain quality is constant, the crop dryer of function admirable provides experimental data accurately, best parameter proportioning is provided, reach and improve drying machine drying efficiency, guarantee drying quality, reduce the final goal of energy consumption for drying.This invention is applicable to the application such as institution of higher education laboratory and R&D institution, the simulated experiment of drying machine manufacturing enterprise.

Outstanding effect of the present invention is to compare with the existing thin layer drying experimental provision of blowing vertically, and this invention thin layer drying experimental facilities adopts horizontal blast vertically to weigh by experiment material.Existing thin layer drying experimental facilities Air Flow and material metage are all on gravity direction, this just causes Air Flow to produce pressure to being weighed cereal, this pressure can produce severe jamming to the weighing results of experiment cereal, the present invention is because the pressure that air-flow produces is in the horizontal direction, on the not impact of vertically weighing, can directly record the changes in weight of the material that is dried, greatly improve the weighing precision of experiment cereal.

Accompanying drawing explanation

Fig. 1 is the top view of thin layer drying experimental facilities of the present invention.

Constant temperature and humidity machine as shown in Figure 1,1; 2, manual air register; 3, blower fan; 4, heater frame; 5, heater; 6, the first Temperature Humidity Sensor; 7, the first valve; 8, hot air duct; 9, pipeline fixing bracket; 10, the second valve; 11, the first air velocity transducer; 12, the second Temperature Humidity Sensor; 13, the 3rd Temperature Humidity Sensor; 14, the second air velocity transducer; 15, the 3rd valve; 16; The 4th valve; 17, workbench; 18, LOAD CELLS; 19, hold material chamber; 20, hothouse; 21, electric-control system; 22, data handling system.

The specific embodiment

Referring to Fig. 1, this invention thin layer drying experimental facilities mainly consists of following several parts:

Be arranged on the constant temperature and humidity machine 1 of the air intake initial position of whole experimental facilities, can heat and humidification air, and guarantee that temperature and humidity is constant, the needed amblent air temperature condition of simulated experiment in certain condition and scope.

Blower fan 3 is connected with constant temperature and humidity machine 1, in the middle of the inlet scoop of constant temperature and humidity machine 1 and blower fan 3, be provided with manual air register 2, by the aperture of manual adjustments air door, control the systematic air flow of experiment use, the effect of blower fan 3 is mainly for drying experiment provides needed air, and regulates the required air mass flow of experiment by controlling the frequency converter of rotation speed of fan.

By the joining heater 5 of air outlet of pipeline and blower fan 3, shell and framework are that stainless-steel sheet seam forms, and in-built finned electrothermal tube, for the needed air of heat run, and by controlled by electric-control system 21 electrothermal tube grouping, obtain testing desired accurate wind-warm syndrome.

Heater support 4 is arranged on the below of blower fan 3 and heater 5, and for fixed support heater 5 and blower fan 3, this heater support 4 is formed by angle steel seam.

The hot air duct 8 that air outlet by heater 5 is drawn, connected with the two ends of hothouse 20 through two-way branch, pipe diameter 200mm, by double-deck stainless steel seam, become the single-pieces such as elbow, threeway, straight tube, between two-layer corrosion resistant plate, fill silicate aluminum board heat-barrier material, reduce heat loss.

The first Temperature Humidity Sensor 6 is arranged on the hot air duct 8 of heater 5 air-out one sides, air themperature and humidity after main acquisition testing is heated by heater 5.

Be arranged on the pipeline fixing bracket 9 of hot air duct 8 belows, with four steel pipe posts, support respectively four airtight valves of metal (the first valve 7, the second valve 10, the 3rd valve 15 and the 4th valve 16), column is fixed on ground by expansion bolt, between each column, by angle steel, connect, pipeline is above become one.

The first air velocity transducer 11 and the second Temperature Humidity Sensor 12 are arranged on one end of close hothouse 20 on hot air duct 8, for detection of wind speed and the aerial temperature and humidity of wind direction B in hothouse 20; The second air velocity transducer 14 and the 3rd Temperature Humidity Sensor 13 are arranged on the other end of close hothouse 20 on hot air duct 8, for detection of wind speed and the aerial temperature and humidity of wind direction C contrary in hothouse 20.

The first valve 7, the second valve 10, the 3rd valve 15 and the 4th valve 16 are metal hard-sealing manually-operated gate, be arranged on four positions of hot air duct 8, by the combination of different valve switch can obtain two kinds of different hot air flows to, thereby making to test cereal can commutate dry, wherein the first valve 7 and the 4th valve 16 are arranged on the both sides of the first Temperature Humidity Sensor 6, be arranged in the pipeline of hot air duct 8, they are closed hot blast are cut off, they are opened and make hot blast through-flow, the second valve 10 is arranged on the position near the first air velocity transducer 11, be positioned on the sidewall of hot air duct 8, it is closed and makes hot blast flow through in pipeline, its unlatching makes hot blast flow out from valve, the 3rd valve 15 is arranged on the position near the second air velocity transducer 14, be positioned on the sidewall of hot air duct 8, its effect is identical with the second valve 10, the switches set of four valves amounts to two states: 1. the first valve 7 is opened, and the second valve 10 is closed, and the 3rd valve 15 is opened, and the 4th valve 16 is closed, and at this moment the hot air flow in hothouse 20 is to being wind direction B, and air speed value is detected by the first air velocity transducer 11, 2. the first valve 7 is closed, and the second valve 10 is opened, and the 3rd valve 15 is closed, and the 4th valve 16 is opened, and at this moment the hot air flow in hothouse 20 is to being wind direction C, and air speed value is detected by the second air velocity transducer 14.

Workbench 17 is arranged on hothouse 20 belows, forms, above for fixedly hothouse 20 and LOAD CELLS 18 with steel plate seam; Hold and expect that chamber 19 is arranged on the inside of hothouse 20, for placing the cereal that is dried, by stainless steel seam, formed, totally 6 parts, one is the appearance material chamber that Grain-Layer thickness can regulate arbitrarily between 1-5cm, and all the other 5 is the appearance material chamber that Grain-Layer thickness is fixed as respectively 10cm, 20cm, 30cm, 40cm, 50cm; LOAD CELLS 18 is arranged between hothouse 20 and workbench 17, for gathering, holds the changes in weight signal of cereal that is dried in material chamber 19, and transfers the signal to the computer and carry out statistical analysis; Hothouse 20 is openable lid above, inside is provided with the pallet of placing the capacity feeder that holds material chamber 19, hothouse two ends are connected with hot air duct 8 by resistant to elevated temperatures flexible link respectively, can reduce like this by hot air duct 8 interference of vibration to LOAD CELLS 18.

Electric-control system 21 is connected with thermometric instrument, frequency converter, motor, blower fan etc. in experimental facilities by cable.

Data handling system 22 is comprised of computer and process software, Real-time Collection the first Temperature Humidity Sensor 6, the second Temperature Humidity Sensor 12 and the 3rd Temperature Humidity Sensor 13, the first air velocity transducer 11 and the second air velocity transducer 14, the signal of LOAD CELLS 18, after analyzing and processing, can draw the change curve between different parameters, the data file showing and generate be got off simultaneously.

Thin layer drying experimental facilities important technological parameters of the present invention is as follows:

1, temperature range: 15-150 ℃;

2, humidity range: 35-85%RH;

3, accuracy of temperature control: ± 0.5 ℃;

4, humidity precision: ± 0.3%;

5, wind speed range: 0-20m/s;

6, measuring wind speed precision: ± 2%FS;

7, scope: the 0-20kg that weighs;

8, weighing precision grade: 0.1;

9, general power: 65.85KW.

Adopt 1 pair of air of constant temperature and humidity machine to heat and humidification, and guarantee that temperature and humidity is constant, the needed amblent air temperature condition of simulated experiment in certain condition and scope.Blower fan 3 air quantity can regulate by the manual adjustments door 2 of fans entrance, also can by frequency converter within the specific limits governing speed complete air quantity and regulate.Heater 5 shells and framework are that stainless-steel sheet seam forms, and take certain Insulation, in-built finned electrothermal tube, for the needed air of heat run, and by electrothermal tube grouping is subject to respectively to electric control system controls, obtain testing desired accurate wind-warm syndrome.Described valve 7,10,15,16 adopts metal hard-sealing manually-operated gate, can guarantee that good sealing again can be high temperature resistant.Hot air duct 8 is become the single-pieces such as elbow, threeway, straight tube by double-deck stainless steel seam, fill silicate aluminum board heat-barrier material between two-layer corrosion resistant plate, effectively reduces heat loss.

After electric-control system 21 and related sensor install, confirm that constant temperature and humidity machine 1 inner blower and outer blower fan 3 are after forward, can carry out test operation by the following step.

Regulate the position of the switch of 4 sealed valves (the first valve 7, the second valve 10, the 3rd valve 15, the 4th valve 16) to a kind of switch combination state;

Start constant temperature and humidity machine 1, be adjusted to desirable original air humiture;

Start blower fan 3, and be adjusted to required wind speed by manual air register 2 or blower fan 3 frequency converters;

Start heater 5, and set corresponding experiment air themperature;

After temperature stabilization, close blower fan 2, open the lid of hothouse 20, the appearance material chamber 19 that cereal is housed is put in hothouse 20, cover lid, starts blower fan 2, at this moment because blower fan 2 air quantity change, also needs further to regulate wind speed and the hot blast temperature in hot air duct 8, microcomputer carries out finishing analysis with regard to the every data that gather simultaneously, and draws corresponding change curve;

In dry run, shut down and change wind direction, to improve uniform drying.

By simulating corresponding environmental condition, just can carry out the test of cereal thin layer drying.By changing respectively heating-up temperature and rotation speed of fan, can record the influence degree of different wind speed to cereal rate of drying under constant temperature, or the influence degree of different wind-warm syndrome to cereal rate of drying under constant wind speed condition, can also hold the thickness that material chamber 19 changes Grain-Layer by replacing, through test draw dry in cereal layer thickness optimum data, determine the rational proportion between each parameter, complete raising drying efficiency, guarantee drying quality, reduce the target of energy consumption for drying.Compare with the existing thin layer drying experimental provision of blowing vertically, this invention thin layer drying experimental facilities adopts horizontal blast vertically to weigh by experiment material, can effectively eliminate the impact of blast on weighing precision.

Claims (10)

1. a thin layer drying experimental facilities, comprising:
Be arranged on the constant temperature and humidity machine (1) of the air intake initial position of whole experimental facilities;
With the joining blower fan of constant temperature and humidity machine (1) (3);
Be arranged on the middle manual air register (2) in inlet scoop of constant temperature and humidity machine (1) and blower fan (3);
By the joining heater of air outlet (5) of pipeline and blower fan (3);
The hot air duct (8) that air outlet by heater (5) is drawn, connected with the two ends of hothouse (20) through two-way branch;
Be arranged on the first Temperature Humidity Sensor (6) on the hot air duct (8) of heater (5) air outlet one side;
The first air velocity transducer (11) and the second Temperature Humidity Sensor (12) are arranged on the upper one end near hothouse (20) of hot air duct (8), and the second air velocity transducer (14) and the 3rd Temperature Humidity Sensor (13) are arranged on the upper other end near hothouse (20) of hot air duct (8);
The first valve (7), the second valve (10), the 3rd valve (15) and the 4th valve (16) are arranged on four positions on hot air duct (8).
2. thin layer drying experimental facilities as claimed in claim 1, it is characterized in that, the first valve (7) and the 4th valve (16) are arranged on the both sides of the first Temperature Humidity Sensor (6), be arranged in the pipeline of hot air duct (8), they are closed hot blast are cut off, they are opened and make hot blast through-flow, the second valve (10) is arranged on the position near the first air velocity transducer (11), be positioned on the sidewall of hot air duct (8), it is closed and makes hot blast flow through in pipeline, its unlatching makes hot blast flow out from valve, the 3rd valve (15) is arranged on the position near the second air velocity transducer (14), be positioned on the sidewall of hot air duct (8), its effect is identical with the second valve (10).
3. the thin layer drying experimental facilities as described in any one in claim 1-2, is characterized in that, heater support (4) is arranged on the below of blower fan (3) and heater (5), and heater support (4) is formed by angle steel seam.
4. the thin layer drying experimental facilities as described in any one in claim 1-3, it is characterized in that, hold and expect that chamber (19) is arranged on the inside of hothouse (20), workbench (17) is arranged on the below of hothouse (20), LOAD CELLS (18) is arranged between hothouse (20) and workbench (17), and the two ends of hothouse (20) are connected with hot air duct (8) by resistant to elevated temperatures flexible link respectively.
5. the thin layer drying experimental facilities as described in any one in claim 1-4, is characterized in that, the shell of heater (5) and framework are that stainless-steel sheet seam forms, in-built finned electrothermal tube.
6. the thin layer drying experimental facilities as described in any one in claim 1-5, it is characterized in that, the first valve (7), the second valve (10), the 3rd valve (15), the 4th valve (16) are metal hard-sealing manually-operated gate, hot air duct (8) is become the single-pieces such as elbow, threeway, straight tube by double-deck stainless steel seam, fill silicate aluminum board heat-barrier material between two-layer corrosion resistant plate.
7. the thin layer drying experimental facilities as described in any one in claim 1-6, is characterized in that, also comprises the data handling system (22) of the parts of equipment being carried out to electric-control system (21) and the pick-up transducers signal of electric power control.
8. the thin layer drying experimental facilities as described in any one in claim 1-7, it is characterized in that, appearance material chamber (19) in hothouse (20) is formed by stainless steel seam, comprise 6 capacity feeders, one is the capacity feeder that Grain-Layer thickness can regulate arbitrarily between 1-5cm, and all the other 5 is the capacity feeder that Grain-Layer thickness is fixed as respectively 10cm, 20cm, 30cm, 40cm, 50cm.
9. a drying process for the thin layer drying experimental facilities as described in claim 1-8, comprises the following steps:
Regulate the position of the switch of the first valve (7), the second valve (10), the 3rd valve (15), the 4th valve (16) to a kind of switch combination state;
Start constant temperature and humidity machine (1), be adjusted to desirable original air humiture;
Start blower fan (3), and be adjusted to required wind speed by the frequency converter of manual air register (2) or blower fan (3);
Start heater (5), and set corresponding experiment air themperature;
After temperature stabilization, close blower fan (3), open the lid of hothouse (20), the appearance material chamber (19) that cereal is housed is put in hothouse (20), start blower fan (3);
Regulate wind speed and hot blast temperature in hot air duct (8), utilize data handling system (22) pick-up transducers signal;
In dry run, shut down and change wind direction.
10. drying process as claimed in claim 9, is characterized in that, can realize by the switch combination of described valve the conversion of two kinds of wind directions:
The first valve (7) is opened, the second valve (10) is closed, and the 3rd valve (15) is opened, and the 4th valve (16) is closed, at this moment the hot air flow in hothouse (20) is to being wind direction (B), and air speed value is detected by the first air velocity transducer (11);
The first valve (7) is closed, the second valve (10) is opened, and the 3rd valve (15) is closed, and the 4th valve (16) is opened, at this moment the hot air flow in hothouse (20) is to being wind direction (C), and air speed value is detected by the first air velocity transducer (14).
CN201410240579.9A 2014-06-03 2014-06-03 Thin layer drying experimental facilities and drying process thereof CN103994652B (en)

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Application Number Priority Date Filing Date Title
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CN103994652B CN103994652B (en) 2016-01-13

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CN105767163A (en) * 2016-03-28 2016-07-20 吉林大学 Vertical type damp-heat and speed-controlled thin layer drying experiment stand and drying method thereof
CN110579090A (en) * 2019-08-23 2019-12-17 广东工业大学 Material drying device and drying method for material to reach target water content

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Publication number Priority date Publication date Assignee Title
CN105767163A (en) * 2016-03-28 2016-07-20 吉林大学 Vertical type damp-heat and speed-controlled thin layer drying experiment stand and drying method thereof
CN110579090A (en) * 2019-08-23 2019-12-17 广东工业大学 Material drying device and drying method for material to reach target water content

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