CN110849137A - Compressor exhaust gas fractional condensation preheating device based on runner drying and regeneration method - Google Patents
Compressor exhaust gas fractional condensation preheating device based on runner drying and regeneration method Download PDFInfo
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- CN110849137A CN110849137A CN201910662374.2A CN201910662374A CN110849137A CN 110849137 A CN110849137 A CN 110849137A CN 201910662374 A CN201910662374 A CN 201910662374A CN 110849137 A CN110849137 A CN 110849137A
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- 238000001035 drying Methods 0.000 title claims abstract description 71
- 238000009833 condensation Methods 0.000 title claims abstract description 27
- 230000005494 condensation Effects 0.000 title claims abstract description 27
- 238000011069 regeneration method Methods 0.000 title claims abstract description 26
- 230000008929 regeneration Effects 0.000 claims abstract description 19
- 239000000463 material Substances 0.000 claims abstract description 10
- 238000007791 dehumidification Methods 0.000 claims description 11
- 238000010438 heat treatment Methods 0.000 claims description 11
- 239000003507 refrigerant Substances 0.000 claims description 11
- 238000005485 electric heating Methods 0.000 claims description 4
- 238000005265 energy consumption Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 238000003795 desorption Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 239000003463 adsorbent Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/06—Controlling, e.g. regulating, parameters of gas supply
- F26B21/08—Humidity
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
- B01D53/06—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with moving adsorbents, e.g. rotating beds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/26—Drying gases or vapours
- B01D53/261—Drying gases or vapours by adsorption
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/02—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure
- F26B21/04—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure partly outside the drying enclosure
Abstract
The invention discloses a compressor exhaust gas fractional condensation preheating device based on rotary wheel drying, which comprises an evaporator, a front-stage condenser, a rear-stage condenser and a drying box for drying materials, wherein an outlet of the drying box is connected with an inlet of the evaporator, an outlet of the evaporator is opposite to a dehumidifying rotary wheel, gas in the evaporator enters the front-stage condenser after passing through the dehumidifying rotary wheel, the front-stage condenser is connected with the rear-stage condenser, and gas in the rear-stage condenser is connected with the inlet of the drying box through a first heater. According to the compressor exhaust gas fractional condensation preheating device based on the runner drying, the front-stage condenser is used for runner regeneration and the rear-stage condenser is used for material drying based on a fractional condensation mode, and meanwhile, the rear-stage condensation heat release can be adjusted and supplemented to the front-stage regeneration according to the heat demand, so that the reasonable configuration of heat energy is realized.
Description
Technical Field
The invention relates to a compressor exhaust gas fractional condensation preheating device based on runner drying and a regeneration method, and belongs to the field of agricultural machinery.
Background
The drying of agricultural products is an important means for the storage thereof. The common drying types include three modes of radiation, conduction and convection drying, wherein the convection drying is widely applied due to the simple equipment and the wide application range. Convection drying generally has adjustable parameters of wind temperature, wind speed and drying medium humidity, but the temperature has an upper limit in each drying stage, and the quality of agricultural products can be damaged when the temperature exceeds the upper limit; the air quantity is not suitable to be adjusted too large, and the air quantity exceeding the optimal air quantity is not beneficial to carrying out sufficient heat exchange between the drying medium and the materials. The humidity of the drying medium is not limited in most drying stages, and low humidity can improve the drying rate and realize low-temperature drying, so that the humidity is an ideal adjusting parameter.
A typical rotary dehumidification system generally comprises a rotary wheel, a surface cooler, a heater and the like. Fresh air or return air is cooled and dehumidified by a surface cooler and then enters the rotating wheel for dehumidification, the rotating wheel is filled with an adsorbent, and the surface of the rotating wheel is divided into a dehumidification and regeneration area. In the dehumidification process, the runner slowly rotates under drive arrangement drives, after the runner reached saturation state in dehumidification regional adsorption of moisture, gets into regeneration zone and carries out desorption regeneration by high temperature air, and this process circulation goes on, and the dry box is sent into after heating or cooling to the processing air-out after the dehumidification drying. Although some patents propose a rotary wheel dehumidification system based on a heat pump system, energy-saving dehumidification is realized, namely an evaporator is used for replacing a surface cooler, a condenser is used for releasing evaporation heat, the cyclic utilization of energy is realized, and the condensation heat is used for drying materials. However, the regeneration temperature of the rotating wheel generally needs about 120 ℃, and the room temperature and the condensation temperature are not high, so that the energy consumption is large when electric heating is needed.
Disclosure of Invention
The purpose of the invention is as follows: in order to overcome the defects in the prior art, the invention provides a compressor exhaust gas fractional condensation preheating device and a regeneration method based on rotary wheel drying.
The technical scheme is as follows: in order to solve the technical problems, the exhaust fractional condensation preheating device of the compressor based on the rotary wheel drying comprises an evaporator, a front-stage condenser, a rear-stage condenser and a drying box for drying materials, wherein an outlet of the drying box is connected with an inlet of the evaporator; the refrigerant passing through the evaporator is compressed by the compressor, then passes through the front-stage condenser and then enters the rear-stage condenser, and the refrigerant in the rear-stage condenser enters the evaporator through a pipeline; the front-stage condenser heats the regenerated inlet air from the environment, certain electric heating is used for assisting in carrying out regeneration treatment on the rotating wheel, and the air dehumidified by the rotating wheel enters the drying box after being heated by the rear-stage condenser and then is subjected to auxiliary heating according to needs. Meanwhile, the later stage condensation heat can also be preferentially distributed to the runner for regeneration according to the requirement.
Preferably, a tee joint device is arranged between the outlet of the drying box and the evaporator, the tee joint device comprises a return air inlet, a fresh air inlet and an air outlet, the return air inlet is provided with a return air inlet valve, the fresh air inlet is provided with a fresh air inlet valve, the first windward side of the evaporator is connected with the air outlet, gas enters the evaporator from the first windward side and is discharged from the second windward side to dehumidify the dehumidifying rotating wheel, and the second windward side is provided with a temperature and humidity sensor.
Preferably, the temperature and humidity sensor detects temperature t ℃, humidity d and enthalpy i equal to 1.01t + (2500+1.84t) d.
Preferably, the temperature and humidity sensor is connected with a controller, and the controller is in signal connection with a return air inlet valve and a fresh air inlet valve respectively.
A regeneration method of a compressor exhaust gas fractional condensation preheating device based on runner drying comprises the following steps:
(1) connecting all the systems;
(2) the controller controls a fresh air inlet valve to be communicated with air outside the system, and the return air at the outlet of the drying box is closed, so that the whole system works normally;
(3) after 4-5min, the controller calculates the last enthalpy value I of the temperature and humidity sensor1The controller controls the fresh air inlet valve to close air outside the system, opens the return air inlet valve, connects return air of the drying box, and after 5-8 s, the controller calculates the enthalpy value I of the temperature and humidity sensor2；
(4) When I is1-I2When the value is larger than zero, the controller controls a return air inlet valve to close the return air of the system, opens a fresh air inlet valve, utilizes outdoor air to dry, and repeats the step (3); if when I1-I2When the value is less than or equal to zero, the controller controls the fresh air inlet valve to close the system fresh air, opens the return air inlet valve, and begins to utilize the return air for drying until the drying is finished.
In the invention, because the traditional box type drying comprises open type, semi-open type and closed type, for example, closed type drying, under the condition of environmental permission, the early-stage return air humidity is large, the temperature is low and the utilization is not suitable, so the open type drying is needed in the early stage, when reaching a certain degree, the return air humidity is small, and the temperature is high, the fresh air can be shut down to utilize the return air for drying, so that the air energy can be better utilized, and the energy-saving drying is realized.
In the invention, the problem of conversion between fresh air and circulating air is controlled by the following program: the temperature and humidity of fresh air and return air after passing through the evaporator are respectively measured by a temperature and humidity sensor, and an enthalpy value is calculated and marked as I1、I2When I is2≥I1The return air is utilized in time, I2＜I1Fresh air is utilized.
The present invention utilizes the fractional condensation technology, i.e. the refrigerant passes through the front-stage condenser to release heat after coming out of the compressor, and can heat the air to T0(T0＞Tc，TcAt the condensation temperature) and assisted by electrical heating to complete the regeneration. The refrigerant is condensed by a post-stage condenser to release heat and then used for heating materials according to needs. Aiming at the problems of large energy consumption and high air temperature of desorption regeneration of the rotating wheel, the exhaust preheating of the compressor is utilized to realize fractional condensation, the efficient utilization of heat is realized, and the regeneration energy consumption is effectively reduced.
In the invention, a front-stage condenser and a rear-stage condenser are connected in series, refrigerant passing through an evaporator is compressed by a compressor, then passes through the front-stage condenser and then enters the rear-stage condenser, air dehumidified by a rotating wheel is heated by the rear-stage condenser and then enters a drying box after being subjected to auxiliary heating according to needs, and the front-stage condenser heats regeneration inlet air from the environment and regenerates the rotating wheel by being assisted with certain electric heating. Meanwhile, the heating load of the post-stage condensation heat release in low-temperature drying is low, and the heat can be adjusted and supplemented to the pre-stage regeneration.
Has the advantages that: compared with the prior art, the invention has the following advantages:
1. a grading condensation mode is established by arranging a first-stage condenser and a second-stage condenser, so that energy-saving regeneration is realized. When a single condenser is adopted in the prior art, all heat is used for drying materials, electric auxiliary heat is adopted in the regeneration process, and after two condensers are adopted, the front-stage condenser is used for regeneration and heating, obviously, the energy is saved compared with the electric auxiliary heat, and moreover, because the front-stage condenser is smaller than the rear-stage condenser, the front-stage condenser can heat air to a temperature higher than the condensation temperature, and high-grade heat energy is obtained. Meanwhile, the scheme can also realize reasonable distribution of the rear-stage energy.
2. Based on the fractional condensation mode, the preceding-stage condenser is used for runner regeneration, and the later-stage condenser is used for material drying, so that the efficient configuration of heat energy is realized.
3. The condenser is connected in series, the condensing area of the rear-stage condenser is several times of that of the front-stage condenser, and the acquisition of high-grade heat energy is promoted. The heating capacity of the rear-stage condenser is about 5 times of that of the front-stage condenser, when the refrigerant enters the front-stage condenser, the refrigerant can enter a two-phase region from an overheated state, although the total heat provided by the stage is not large, the air can be heated to a higher temperature, high-grade heat energy is obtained, and the heat energy is improved
Efficiency, and reduced energy consumption of electric auxiliary heating.
Drawings
FIG. 1 is a system diagram of the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings.
As shown in fig. 1, the exhaust gas fractional condensation preheating device of the compressor based on the rotary wheel drying of the present invention comprises an evaporator 1, a pre-stage condenser 6, a post-stage condenser 7 and a drying box 9 for drying materials, wherein an outlet of the drying box 9 is connected with an inlet of the evaporator 1, an outlet of the evaporator 1 is opposite to a dehumidifying rotary wheel 11, gas in the evaporator 1 enters the post-stage condenser 7 after passing through the dehumidifying rotary wheel and a dehumidifying fan 10, the pre-stage condenser 6 is connected with the post-stage condenser 7 in series, and gas in the post-stage condenser 7 is connected with the inlet of the drying box 9 through a first heater. The pre-stage condenser 6 heats the regeneration intake air from the environment by the second heater 5, heats the dehumidification rotor 4 by the dehumidification rotor after heating, and discharges the heated air by the fan 3. The refrigerant passing through the evaporator is compressed by the compressor 2, passes through the front stage condenser 6, and then enters the rear stage condenser 7, and the refrigerant in the rear stage condenser 7 enters the evaporator 1 through a pipeline.
In the invention, a three-way device is arranged between the outlet of the drying box 9 and the evaporator 1, the three-way device comprises a return air inlet 15, a fresh air inlet 18 and an air outlet 19, the return air inlet 15 is provided with a return air inlet valve 16, the return air outlet 13 is provided with a return air outlet valve 14, the fresh air inlet is provided with a fresh air inlet valve 17, the first windward side of the evaporator 1 is connected with the air outlet, gas enters the evaporator 1 from the first windward side and is discharged from the second windward side to dehumidify the dehumidifying rotor, and the second windward side is provided with a temperature and humidity sensor 12. The temperature detected by the temperature and humidity sensor 12 is t ℃, the humidity is d, and the enthalpy value i is 1.01t + (2500+1.84t) d. The temperature and humidity sensor 12 is connected with a controller, and the controller is respectively in signal connection with a return air inlet valve and a fresh air inlet valve.
A regeneration method of a compressor exhaust gas fractional condensation preheating device based on runner drying comprises the following steps:
(1) connecting all the systems;
(2) the controller controls a fresh air inlet valve to be communicated with air outside the system, the return air at the outlet of the drying box 9 is closed, and the whole system works normally;
(3) after 4-5min, the controller calculates the last enthalpy value I of the temperature and humidity sensor 121The controller controls the fresh air inlet valve to close air outside the system, opens the return air inlet valve, connects the return air of the drying box 9, and after 5-8 s, the controller calculates the enthalpy value I of the temperature and humidity sensor 122；
(4) When I is1-I2When the value is larger than zero, the controller controls a return air inlet valve to close the return air of the system, opens a fresh air inlet valve, utilizes outdoor air to dry, and repeats the step (3); if when I1-I2When the value is less than or equal to zero, the controller controls the fresh air inlet valve to close the system fresh air, opens the return air inlet valve, and begins to utilize the return air for drying until the drying is finished.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.
Claims (5)
1. The utility model provides a compressor exhaust fractional condensation preheating device based on runner is dry which characterized in that: the drying device comprises an evaporator, a front-stage condenser, a rear-stage condenser and a drying box for drying materials, wherein an outlet of the drying box is connected with an inlet of the evaporator, an outlet of the evaporator is opposite to a dehumidifying rotating wheel, gas in the evaporator enters the rear-stage condenser after passing through the dehumidifying rotating wheel, the rear-stage condenser is connected with the front-stage condenser, and the gas in the rear-stage condenser is connected with the inlet of the drying box through a first heater; the refrigerant passing through the evaporator is compressed by the compressor, then passes through the front-stage condenser and then enters the rear-stage condenser, and the refrigerant in the rear-stage condenser enters the evaporator through a pipeline; the front-stage condenser heats the regenerated inlet air from the environment, certain electric heating is used for carrying out regeneration treatment on the rotating wheel, and the air dehumidified by the rotating wheel is heated by the rear-stage condenser and then is subjected to auxiliary heating as required and then enters the drying box.
2. The rotary wheel drying-based compressor exhaust gas fractional condensation preheating device of claim 1, wherein: be equipped with three-way device between the export of drying cabinet and the evaporimeter, three-way device contains return air intake, new trend air intake and air outlet, the return air intake is equipped with the return air inlet valve, goes out at the new trend air intake and is equipped with the new trend air inlet valve, and the first windward side and the air outlet of evaporimeter are connected, and gas gets into the evaporimeter from first windward side, discharges from the second windward side, dehumidifies the dehumidification runner, is equipped with temperature and humidity sensor at the second windward side.
3. The rotary wheel drying-based compressor exhaust gas fractional condensation preheating device of claim 2, wherein: the temperature and humidity sensor detects temperature t ℃, humidity d and enthalpy i equal to 1.01t + (2500+1.84t) d.
4. The rotary wheel drying-based compressor exhaust gas fractional condensation preheating device of claim 3, wherein: the temperature and humidity sensor is connected with the controller, and the controller is in signal connection with the return air inlet valve and the fresh air inlet valve respectively.
5. The regeneration method of the compressor exhaust gas fractional condensation preheating device based on the runner drying as claimed in claim 4, characterized by comprising the following steps:
(1) connecting all the systems;
(2) the controller controls a fresh air inlet valve to be communicated with air outside the system, and the return air at the outlet of the drying box is closed, so that the whole system works normally;
(3) after 4-5min, the controller calculates the last enthalpy value I of the temperature and humidity sensor1The controller controls the fresh air inlet valve to close air outside the system, opens the return air inlet valve, connects return air of the drying box, and after 5-8 s, the controller calculates the enthalpy value I of the temperature and humidity sensor2；
(4) When I is1-I2When the value is larger than zero, the controller controls a return air inlet valve to close the return air of the system, opens a fresh air inlet valve, utilizes outdoor air to dry, and repeats the step (3); if when I1I2When the value is less than or equal to zero, the controller controls the fresh air inlet valve to close the system fresh air, opens the return air inlet valve, and begins to utilize the return air for drying until the drying is finished.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
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| CN2019100587846 | 2019-01-22 | ||
| CN201910058784 | 2019-01-22 |
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| CN110849137A true CN110849137A (en) | 2020-02-28 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113877363A (en) * | 2021-09-14 | 2022-01-04 | 徐州徐工施维英机械有限公司 | Low-concentration VOCs waste gas energy-saving treatment method and device |
| CN115720926A (en) * | 2022-11-29 | 2023-03-03 | 农业农村部南京农业机械化研究所 | Pipeline temperature control-based edible fungus rotating wheel heat pump combined drying system regulation and control method |
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| US20140165637A1 (en) * | 2011-08-25 | 2014-06-19 | Jun Ma | Coupled air-conditioning device |
| CN104019643A (en) * | 2013-02-28 | 2014-09-03 | 中国科学院理化技术研究所 | Agricultural product heat pump drying system with waste heat recovery function |
| CN204854181U (en) * | 2015-06-18 | 2015-12-09 | 彭福明 | Drying device is united to dehumidification microwave |
| CN106196346A (en) * | 2016-07-04 | 2016-12-07 | 迪思特空气处理设备(常熟)有限公司 | A kind of energy-efficient low dew point rotary dehumidifier |
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| CN210638472U (en) * | 2019-07-22 | 2020-05-29 | 农业农村部南京农业机械化研究所 | Compressor exhaust fractional condensation preheating device based on runner drying |
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2019
- 2019-07-22 CN CN201910662374.2A patent/CN110849137A/en active Pending
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| CN2424431Y (en) * | 2000-05-25 | 2001-03-21 | 华南理工大学 | Adsorbing rotary drier |
| US20140165637A1 (en) * | 2011-08-25 | 2014-06-19 | Jun Ma | Coupled air-conditioning device |
| CN102716644A (en) * | 2012-06-20 | 2012-10-10 | 马军 | Vapor compression type heat pump and rotary wheel adsorptive dehumidification coupled operation dryer |
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| CN210638472U (en) * | 2019-07-22 | 2020-05-29 | 农业农村部南京农业机械化研究所 | Compressor exhaust fractional condensation preheating device based on runner drying |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113877363A (en) * | 2021-09-14 | 2022-01-04 | 徐州徐工施维英机械有限公司 | Low-concentration VOCs waste gas energy-saving treatment method and device |
| CN115720926A (en) * | 2022-11-29 | 2023-03-03 | 农业农村部南京农业机械化研究所 | Pipeline temperature control-based edible fungus rotating wheel heat pump combined drying system regulation and control method |
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