CN103994652B - Thin layer drying experimental facilities and drying process thereof - Google Patents

Thin layer drying experimental facilities and drying process thereof Download PDF

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Publication number
CN103994652B
CN103994652B CN201410240579.9A CN201410240579A CN103994652B CN 103994652 B CN103994652 B CN 103994652B CN 201410240579 A CN201410240579 A CN 201410240579A CN 103994652 B CN103994652 B CN 103994652B
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valve
hothouse
air
hot air
experimental facilities
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CN201410240579.9A
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Chinese (zh)
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CN103994652A (en
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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

This invention proposes a kind of thin layer drying experimental facilities, comprising: the constant temperature and humidity machine (1) being arranged on the air intake initial position of whole experimental facilities; With constant temperature and humidity machine (1) joining blower fan (3); Be arranged on the manual air register (2) that the inlet scoop of constant temperature and humidity machine (1) and blower fan (3) is middle; By the joining heater of air outlet (5) of pipeline and blower fan (3); The hot air duct (8) of being drawn by the air outlet of heater (5), being connected with the two ends of hothouse (20) through two-way branch; Air velocity transducer (11,14), Temperature Humidity Sensor (6,12 on hot air duct (8) is installed, 13) and valve (7,10,15,16) the present invention also proposes the drying process that this thin layer drying experimental facilities a kind of adopts.

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 cooked mode comparatively extensive at present, how to select rational drying parameter (as medium temperature, wind speed, Grain-Layer thickness etc.) concerning critical.China's grain machinery dry amount increases year by year, particularly the Northeast is generally annual March extremely next year in November drying time, because environment temperature is low in the meantime, grain moisture content is high, the features such as uniform moisture degree difference, the problems such as after grain drying ubiquity energy consumption for drying is high, dry, quality is low, moisture is restive.And its rational drying parameter can be determined for different cereal by this thin layer drying experimental facilities, not only can solve the problem, and automatically can control based theoretical for realizing grain drying, make that the grain drying of grain drying particularly extremely frigid zones reaches energy-conservation, efficient, the desirable job state of high-quality.

Summary of the invention

In order to solve the problems referred to above that Grain Drying Process exists, main purpose of the present invention is by key parameter proportionings such as rational drying medium temperature, depth of grain layer, wind speed under this thin layer drying experimental facilities determination different condition, thus 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 being arranged on whole experimental facilities; Blower fan joining with constant temperature and humidity machine; Be arranged on the manual air register that the inlet scoop of constant temperature and humidity machine and blower fan is middle; By the joining heater of air outlet of pipeline and blower fan; The hot air duct of being drawn by the air outlet of heater, being 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 vents side; First air velocity transducer and the second Temperature Humidity Sensor are arranged on the one end near hothouse on hot air duct, and the second air velocity transducer and the 3rd Temperature Humidity Sensor are arranged on the other end near hothouse on hot air duct; 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, 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 and are then cut off by hot blast, they are opened and then make hot blast through-flow, second valve installation is in the position near the first air velocity transducer, be positioned on the sidewall of hot air duct, its closedown then makes hot blast flow through in the duct, its unlatching then makes hot blast flow out from valve, 3rd valve installation is in the position near the second air velocity transducer, and be positioned on the sidewall of hot air duct, 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 the inside that material room is arranged on 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 respectively by resistant to elevated temperatures flexible link.

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, first valve, the second valve, the 3rd valve, the 4th valve are metal hard-sealing manually-operated gate, hot air duct becomes the single-pieces such as elbow, threeway, straight tube by double-deck stainless steel seam, fills silicate aluminum board heat-barrier material between two-layer corrosion resistant plate.

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

According to the preferred embodiment of the present invention, appearance material room in hothouse is formed by stainless steel seam, holding material room is by the diameter 200mm cylinder of corrosion resistant plate seam, have by the volume at 20 removable or fixing order stainless steel cloth intervals of two panels in cylinder, for hold different-thickness by experiment cereal, barrel is provided with round mouth with a lid, is convenient to handling by experiment cereal.Hold material totally 6, room, one is that Grain-Layer thickness can regulate arbitrarily between 1-5cm, and all the other 5 the appearance material rooms being Grain-Layer thickness and being fixed as 10cm, 20cm, 30cm, 40cm, 50cm respectively, 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: the position of the switch extremely a kind of switch combination state regulating the first valve, the second valve, the 3rd valve, the 4th valve; Start constant temperature and humidity machine, be adjusted to desirable original air humiture; Start blower fan, and manually the frequency converter of air register or blower fan is adjusted to required wind speed; Start heater, and setting tests air themperature accordingly; After temperature stabilization, close blower fan, open the lid of hothouse, the appearance material room that cereal is housed is put in hothouse, start blower fan; Regulate the wind speed in hot air duct and hot blast temperature, utilize data handling system pick-up transducers signal; Shut down in dry run and change wind direction.

According to the preferred embodiment of the present invention, the conversion of two kinds of wind directions can be realized: the first valve opening by the switch combination of described valve, second valve closing, 3rd valve opening, 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; First valve closing, the second valve opening, the 3rd valve closing, the 4th valve opening, the hot air flow at this moment in hothouse is to being wind direction C, and 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 influence degree to the grain dry uniformity is drawn by the time interval of difference conversion wind direction, for dryer design provides rational wind direction to convert parameter, the drying uniformity of drying machine can be improved, 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, by simulating corresponding environment, through air heat, drying is carried out to cereal, change heating-up temperature and rotation speed of fan, under can obtaining constant temperature, different wind speed is to the influence degree of grain dry speed, or different wind-warm syndrome is to the influence degree of grain dry speed under constant wind speed condition, the thickness that material room changes Grain-Layer can also be held by changing, Grain-Layer thickness optimum data in drying is drawn through test, determine the rational proportion between each parameter, for actual drying machine under difficult environmental conditions dry different cereal the most rational drying parameter is provided, for design efficient energy-saving, after dry, grain quality is constant, the crop dryer of function admirable provides experimental data accurately, best parameters adjusting is provided, reach and improve drying machine drying efficiency, ensure drying quality, reduce the final goal of energy consumption for drying.This invention is applicable to institution of higher education laboratory and the application such as R&D institution, the simulated experiment of drying machine manufacturing enterprise.

Outstanding effect of the present invention is compared with 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 flowing with material metage is all on gravity direction, this just causes air to flow to being weighed cereal generation pressure, this pressure can produce severe jamming to the weighing results of experiment cereal, the present invention due to the pressure that air-flow produces be in the horizontal direction, on not impact of vertically weighing, directly can record the weight change of dried material, 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.

As shown in Figure 1,1, constant temperature and humidity machine; 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; 4th valve; 17, workbench; 18, LOAD CELLS; 19, material room is held; 20, hothouse; 21, electric-control system; 22, data handling system.

Detailed description of the invention

See Fig. 1, this invention thin layer drying experimental facilities is formed primarily of following a few part:

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 ensure that temperature and humidity is constant, the environmental weather conditions in certain condition and scope required for simulated experiment.

Blower fan 3 and constant temperature and humidity machine 1 are connected, manual air register 2 is provided with in the centre, inlet scoop of constant temperature and humidity machine 1 and blower fan 3, manually the aperture of damper carrys out the systematic air flow of Control release, the effect of blower fan 3 mainly for drying experiment provides required air, and regulates the air mass flow needed for experiment by the frequency converter controlling 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 air of heat run, and by electrothermal tube grouping being controlled by electric-control system 21 respectively, obtain the accurate wind-warm syndrome required by testing.

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

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

Be arranged on the pipeline fixing bracket 9 below hot air duct 8, four airtight valves of metal (the first valve 7, second valve 10, the 3rd valve 15 and the 4th valve 16) are supported respectively with four steel pipe posts, column is fixed on ground by expansion bolt, by Bolted angle connection between each column, pipeline is above made to become to be integrated.

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

First valve 7, second valve 10, 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 different valve switch combination can obtain two kinds of different hot air flows to, thus test cereal is commutated drying, 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 and are then cut off by hot blast, they are opened and then make hot blast through-flow, 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, its closedown then makes hot blast flow through in the duct, its unlatching then makes hot blast flow out from valve, 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 the hot air flow at this moment 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 the hot air flow at this moment 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 below hothouse 20, forms with steel plate seam, above for fixing hothouse 20 and LOAD CELLS 18; Hold the inside that material room 19 is arranged on hothouse 20, for placing dried cereal, formed by stainless steel seam, totally 6 parts, an appearance material room being Grain-Layer thickness and can regulating arbitrarily between 1-5cm, all the other 5 the appearance material rooms being Grain-Layer thickness and being fixed as 10cm, 20cm, 30cm, 40cm, 50cm respectively; LOAD CELLS 18 is arranged between hothouse 20 and workbench 17, holds the weight change signal of dried cereal in material room 19 for gathering, and transfers the signal to the computer and carry out statistical analysis; Hothouse 20 is openable lid above, inside is provided with the pallet placing the capacity feeder holding material room 19, hothouse two ends are connected with hot air duct 8 respectively by resistant to elevated temperatures flexible link, can reduce like this and vibrate interference to LOAD CELLS 18 by hot air duct 8.

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 made up of computer and process software, Real-time Collection first Temperature Humidity Sensor 6, second Temperature Humidity Sensor 12 and the 3rd Temperature Humidity Sensor 13, first air velocity transducer 11 and the second air velocity transducer 14, the signal of LOAD CELLS 18, the change curve between different parameters can be drawn after analyzing and processing, will to show and the data file generated is got off simultaneously.

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

1, temperature range: 15-150 DEG C;

2, humidity range: 35-85%RH;

3, accuracy of temperature control: ± 0.5 DEG C;

4, humidity precision: ± 0.3%;

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

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

7, weigh scope: 0-20kg;

8, weighing precision grade: 0.1;

9, general power: 65.85KW.

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

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

Regulate the position of the switch of 4 sealed valves (the first valve 7, 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 manually air register 2 or blower fan 3 frequency converter are adjusted to required wind speed;

Start heater 5, and setting tests air themperature accordingly;

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

Shut down in dry run and change wind direction, to improve uniform drying.

Just cereal thin-layer drying can be carried out by simulating corresponding environmental condition.By changing heating-up temperature and rotation speed of fan respectively, under can recording constant temperature, different wind speed is to the influence degree of grain dry speed, or different wind-warm syndrome is to the influence degree of grain dry speed under constant wind speed condition, the thickness that material room 19 changes Grain-Layer can also be held by changing, draw Grain-Layer thickness optimum data in drying through test, determine the rational proportion between each parameter, complete raising drying efficiency, ensure drying quality, reduce the target of energy consumption for drying.Compared with 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, effectively can eliminate the impact of blast on weighing precision.

Claims (9)

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 constant temperature and humidity machine (1) joining blower fan (3);
Be arranged on the manual air register (2) that the inlet scoop of constant temperature and humidity machine (1) and blower fan (3) is middle;
By the joining heater of air outlet (5) of pipeline and blower fan (3);
The hot air duct (8) of being drawn by the air outlet of heater (5), being 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 side;
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);
Be arranged on the first valve (7) on hot air duct (8), second valve (10), 3rd valve (15) and the 4th valve (16), wherein, 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 and are then cut off by hot blast, they are opened and then make hot blast through-flow, 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), its closedown then makes hot blast flow through in the duct, its unlatching then makes hot blast flow out from valve, 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).
2. thin layer drying experimental facilities as claimed in claim 1, it 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.
3. the thin layer drying experimental facilities according to any one of claim 1-2, it is characterized in that, hold the inside that material room (19) is arranged on 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) respectively by resistant to elevated temperatures flexible link.
4. the thin layer drying experimental facilities according to any one of claim 1-2, is characterized in that, the shell of heater (5) and framework are that stainless-steel sheet seam forms, in-built finned electrothermal tube.
5. the thin layer drying experimental facilities according to any one of claim 1-2, it is characterized in that, 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) becomes elbow, threeway or straight tube by double-deck stainless steel seam, fills silicate aluminum board heat-barrier material between two-layer corrosion resistant plate.
6. the thin layer drying experimental facilities according to any one of claim 1-2, is characterized in that, also comprises and carries out the electric-control system (21) of Electric control and the data handling system (22) of pick-up transducers signal to the parts of equipment.
7. the thin layer drying experimental facilities according to any one of claim 1-2, it is characterized in that, appearance material room (19) in hothouse (20) is formed by stainless steel seam, comprise 6 capacity feeders, a capacity feeder being Grain-Layer thickness and can regulating arbitrarily between 1-5cm, all the other 5 capacity feeders being Grain-Layer thickness and being fixed as 10cm, 20cm, 30cm, 40cm, 50cm respectively.
8. a drying process for the thin layer drying experimental facilities according to any one of claim 1-7, comprises the following steps:
Regulate the position of the switch extremely a kind of switch combination state of the first valve (7), the second valve (10), the 3rd valve (15), the 4th valve (16);
Start constant temperature and humidity machine (1), be adjusted to desirable original air humiture;
Start blower fan (3), and manually the frequency converter of air register (2) or blower fan (3) is adjusted to required wind speed;
Start heater (5), and setting tests air themperature accordingly;
After temperature stabilization, close blower fan (3), open the lid of hothouse (20), the appearance material room (19) that cereal is housed is put in hothouse (20), start blower fan (3);
Regulate the wind speed in hot air duct (8) and hot blast temperature, utilize data handling system (22) pick-up transducers signal;
Shut down in dry run and change wind direction.
9. drying process as claimed in claim 8, be is characterized in that, can be realized the conversion of two kinds of wind directions by the switch combination of described valve:
First valve (7) is opened, second valve (10) is closed, 3rd valve (15) is opened, 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);
First valve (7) is closed, second valve (10) is opened, 3rd valve (15) is closed, 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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CN105767163B (en) * 2016-03-28 2017-06-16 吉林大学 A kind of vertical wet thermal control speed thin-layer drying platform and drying means
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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