Multi-stage regenerative dehumidifier based on air expansion refrigeration cycle

Abstract

The utility model discloses a multistage regenerative dehumidifier based on air expansion refrigeration circulation, which belongs to the technical field of dehumidifier equipment and comprises an air circulation system and a control system. The air circulation system comprises an air inlet, a compressor, an air cooling heat exchanger, a first heat regenerator and an air outlet which are sequentially connected through a second pipeline, and further comprises a first heat regenerator, a second heat regenerator and an expansion machine which are sequentially connected through a first pipeline in a double-pipe mode. The control system comprises an external program control module, a first pressure sensor, a second pressure sensor, a temperature sensor, an electric heating device and an electromagnetic valve. The device can control dew point temperature and humidity, is good in dehumidification effect, low in energy consumption, simple in structure, flexible to operate, safe, reliable, environment-friendly and pollution-free, and is suitable for various application scenes.

Description

Technical Field

[0001] The utility model relates to the technical field of dehumidifier equipment, and particularly relates to a multi-stage regenerative dehumidifier based on an air expansion refrigeration cycle. Background Technique

[0002] With the continuous development of technology, people gradually find that air humidity has an important impact on production and life. In life, air humidity affects people's living comfort and physical health; in production, the breeding and livestock industries have strict requirements for air humidity, and reasonable air humidity also has a crucial impact on the storage time.

[0003] In the prior art, the principles of rotary dehumidifiers and refrigeration dehumidifiers are mainly adopted. A dehumidifier is disclosed in Chinese Patent CN110418921A, which dehumidifies air by means of air expansion refrigeration. However, it only conducts one-stage cooling and dehumidification, and the temperature reduction is relatively high, resulting in poor dehumidification effect. Moreover, the device uses mechanical heat energy to inhibit defrosting, with poor defrosting effect, and there is a situation of ice blockage in the pipeline after running for a period of time.

[0004] The utility model is provided with a multi-stage regenerative dehumidification device and a defrosting device, which can cool the air to -140°C at the lowest, reduces energy consumption by means of air heat exchange, and realizes dew point temperature regulation, moisture content regulation and defrosting work through a control system. Content of the Utility Model

[0005] The utility model aims to overcome the above-mentioned disadvantages existing in the prior art, and provides a multi-stage regenerative dehumidifier device based on an air expansion refrigeration cycle, which realizes the controllable functions of dew point temperature and humidity; uses air expansion refrigeration, and the lowest dew point temperature can reach -140°C; solves the problem of equipment occupation area, is suitable for both large-space and large-flow dehumidification work and small-space and small-range dehumidification work; at the same time, it realizes waste gas utilization, energy conservation and environmental protection.

[0006] The technical solution adopted by the utility model to solve its technical problems is as follows:

[0007] The utility model is realized in such a way that a multi-stage regenerative dehumidifier device based on an air expansion refrigeration cycle is constructed, and the device includes an air circulation system and a control system.

[0008] The air circulation system includes a dehumidifier air outlet, a dehumidifier air inlet, a compressor, an air-cooled heat exchanger, a first regenerator, a second regenerator, an expander, a first pipeline, and a second pipeline. The dehumidifier air inlet is connected to the air inlet of the compressor through the second pipeline. The air outlet of the compressor is connected to the air inlet of the air-cooled heat exchanger through the second pipeline. The air outlet of the air-cooled heat exchanger is connected to the inlet a of the first regenerator through the second pipeline. The outlet h of the first regenerator is connected to the dehumidifier air outlet through the second pipeline, the outlet b is connected to the inlet c of the second regenerator through the first pipeline, and the inlet g is connected to the inlet f of the second regenerator through the first pipeline. The outlet d of the second regenerator is connected to the air inlet of the expander through the first pipeline, and the inlet e is connected to the air outlet of the expander through the first pipeline. A second pipeline is provided between the dehumidifier air outlet and the dehumidifier air inlet;

[0009] The control system includes an external program control module, a first pressure sensor provided on the first pipeline at the inlet c of the second regenerator, a second pressure sensor provided on the first pipeline at the outlet d of the second regenerator, and a temperature sensor.

[0010] Preferably, the utility model includes three operating modes, namely an initial cooling mode, a dehumidifying air supply mode, and a defrosting heating mode. The first pressure sensor, the second pressure sensor, and the temperature sensor transmit the detected information to the program control module through signal lines. The program control module controls the compressor, the air-cooled heat exchanger, the expander, solenoid valve 1, solenoid valve 2, solenoid valve 3, solenoid valve 4, solenoid valve 5, solenoid valve 6, and solenoid valve 7 to change the equipment operating mode.

[0011] In the initial cooling mode: Solenoid valve 1, solenoid valve 2, solenoid valve 4, solenoid valve 5, solenoid valve 6, and solenoid valve 7 are closed, and solenoid valve 3 is opened. The compressor, the air-cooled heat exchanger, and the expander operate. In the dehumidifying air supply mode: Solenoid valve 3 and solenoid valve 4 are closed, and solenoid valve 1, solenoid valve 2, solenoid valve 5, solenoid valve 6, and solenoid valve 7 are opened. The compressor, the air-cooled heat exchanger, and the expander operate. In the defrosting heating mode: Solenoid valve 2 and solenoid valve 3 are closed, and solenoid valve 1, solenoid valve 4, solenoid valve 5, solenoid valve 6, and solenoid valve 7 are opened. The compressor operates, and the air-cooled heat exchanger and the expander stop operating.

[0012] Preferably, a filter is provided at the dehumidifier air inlet, and the filter can prevent sundries from entering the instrument.

[0013] Preferably, the compressor and the expander adopt a co-bearing design. The bearing uses an oil-free air suspension bearing. The compressor sucks the air to be processed at the dehumidifier air inlet, heats and pressurizes the air, and then circulates the air to the air-cooled heat exchanger; at the same time, it provides high-pressure gas for the expander. The high-pressure air passes through the expander to reduce the temperature and pressure, recover part of the compression work, and reduce energy consumption; the speed of the compressor is adjustable and can be used to control the temperature at the outlet of the expander.

[0014] Preferably, a two-way pipe two is arranged inside the regenerator one. One is the cooling and dehumidifying pipe two, which is located between the air inlet a and the air inlet b, and the other is the cold air supply pipe two, which is located between the air inlet g and the air outlet h.

[0015] Preferably, a two-way pipe two is arranged inside the regenerator two. One is the cooling and dehumidifying pipe two, which is located between the air inlet c and the air outlet d, and the other is the cold air supply pipe two, which is located between the air inlet e and the air outlet f.

[0016] Preferably, a frost catcher is arranged at the outlet of the expander. The air outlet of the frost catcher is connected to the air inlet e of the regenerator two through the pipe one, and the frost catcher captures the condensed frost at the outlet of the expander.

[0017] Preferably, solenoid valves one, two, three, four, five, six and seven are arranged on the pipe one and the pipe two, and the installation positions are as follows: solenoid valve one is arranged on the pipe two at the outlet of the filter; solenoid valve two is arranged on the pipe two at the air outlet of the dehumidifier; solenoid valve three is arranged on the pipe two between the air inlet and the air outlet of the dehumidifier; solenoid valve four is arranged on the regenerative circuit pipe one between the regenerator one and the regenerator two; solenoid valve five is arranged on the pipe one outside the air outlet b of the regenerator one; solenoid valve six is arranged on the pipe one outside the air outlet d of the regenerator two; solenoid valve seven is arranged at the lowest point at the bottom of the frost catcher.

[0018] Preferably, the surface of the pipe one is wrapped with heat insulation material; the surfaces of the regenerator two, the expander and the frost catcher are wrapped with heat insulation material.

[0019] Preferably, multiple groups of the air circulation system can be arranged in parallel.

[0020] Through research and improvement, the utility model provides a multi-stage regenerative dehumidifier based on the air expansion refrigeration cycle, which has the following advantages:

[0021] 1. The utility model is provided with an air-cooled heat exchanger, a regenerator one and a regenerator two, which can perform multi-stage cooling and dehumidification, and has good dehumidification effect. The air heat exchange method is used for cooling, reducing energy consumption and saving resources.

[0022] 2. The utility model is equipped with a program control module, and the dew point temperature adjustment and moisture content adjustment are realized through the control system, with flexible operation and suitable for various application scenarios.

[0023] 3. The utility model is provided with a control system, and an initial cooling mode, a dehumidifying air supply mode and a defrosting heating mode are arranged inside the control system, and the equipment performance is excellent.

[0024] 4. The air circulation system of the present utility model adopts a modular design and can be used in series with multiple groups. It is suitable for dehumidification work with large space and large flow rate, and is also suitable for dehumidification work with small space and small flow rate.

[0025] 5. The compressor and expander of the present utility model adopt the same bearing design, and the bearing adopts an oil-free air suspension bearing, which reduces energy consumption and saves resources.

[0026] 6. The present utility model has few components, high system reliability, simple equipment control and small floor area.

[0027] 7. The present utility model is provided with heat preservation facilities, which not only avoid the heat dissipation of the air inside and outside the pipeline, save resources, improve the dehumidification effect, but also avoid frostbite or scalding and improve safety.

[0028] 8. The working principle of the present utility model belongs to physical change, which is environmentally friendly and pollution-free. Description of the Drawings

[0029] Figure 1 is the system circulation diagram of the present utility model;

[0030] Figure 2 is the operating temperature parameter diagram of the present utility model;

[0031] Figure 3 is the initial cooling mode operation flow chart of the present utility model;

[0032] Figure 4 is the dehumidification air supply mode operation flow chart of the present utility model;

[0033] Figure 5 is the defrosting heating mode operation flow chart of the present utility model.

[0034] Among them: 1. Outlet of the dehumidifier; 2. Inlet of the dehumidifier; 3. Filter; 4. Compressor; 5. Air-cooled heat exchanger; 6. Regenerator I; 7. Regenerator II; 8. Expander; 9. Frost catcher; 10. Pipeline I; 10'. Closed pipeline I; 11. Pipeline II; 11'. Closed pipeline II; 12. Pressure sensor I; 13. Pressure sensor II; 14. Temperature sensor; 101. Solenoid valve I; 102. Solenoid valve II; 103. Solenoid valve III; 104. Solenoid valve IV; 105. Solenoid valve V; 106. Solenoid valve VI; 107. Solenoid valve VII. Detailed Embodiments

[0035] In order to enable those skilled in the art to better understand the technical solutions in the present utility model, the following will combine the appended Figures 1-5 in the embodiments of the present utility model to elaborate on the operation mode of the present utility model, assuming that the air dew point temperature is set to -80°C.

[0036] Such asFigure 1 and Figure 2 As shown in Figure 2 , the system circulation diagram and an operating temperature parameter diagram of the present utility model are presented. The instrument of the present utility model is equipped with a program control module, which can realize the reading and control of temperature, pressure, the rotational speed parameters of the compressor 4 and the expander 8, and the control of the air-cooled heat exchanger 5. The system controls the rotational speed of the compressor, thereby controlling the air temperature at the outlet d position, that is, controlling the air dew point temperature, to achieve the best dehumidification effect.

[0037] Example 1, initial cooling mode, as shown in Figure 2 and Figure 3 shown.

[0038] In the described operating mode: close solenoid valve 101, solenoid valve 102, solenoid valve 104, solenoid valve 105, solenoid valve 106 and solenoid valve 107, open solenoid valve 103, turn on the fan of the air-cooled heat exchanger 5, operate the compressor 4 and the expander 8, and the air circulates inside the equipment. The pipes at the dehumidifier inlet 2 and the dehumidifier outlet 1 are the closed pipe 11'. The circulation process is: compressor - air-cooled heat exchanger - inlet a - outlet b - inlet c - outlet d - expander - defroster - inlet e - outlet f - inlet g - outlet h - compressor. After the dual cooling effects of the air-cooled heat exchanger 5 and the expander 8, the air temperature inside the circulation will gradually decrease. When the temperature at the outlet d position of the regenerator 2 reaches -80°C, the initial cooling state is completed.

[0039] This process is a closed-loop circulation of the system.

[0040] Example 2, dehumidification and air supply mode, as shown in Figure 2 and Figure 4 shown.

[0041] In the described operating mode: close solenoid valve 103, solenoid valve 104, solenoid valve 106 and solenoid valve 107, open solenoid valve 101 and solenoid valve 102, open solenoid valve 105 when discharging condensed water and close it at other times. The pipe between the dehumidifier inlet 2 and the dehumidifier outlet 1 is the closed pipe 11'. Turn on the fan of the air-cooled heat exchanger 5, operate the compressor 4 and the expander 8, and the equipment starts to dehumidify the external air. The air dehumidification process is: dehumidifier inlet - filter - compressor - air-cooled heat exchanger - inlet a - outlet b - inlet c - outlet d - expander - defroster - inlet e - outlet f - inlet g - outlet h - dehumidifier outlet.

[0042] (1) In the first step of the process, the air to be processed enters the device from the air inlet of the dehumidifier, passes through the filter 3, and then enters the compressor 4. After being compressed, heated, and pressurized by the compressor 4 (air temperature: 70°C), it circulates to the air-cooled heat exchanger 5, where the air to be processed is initially cooled (air temperature: 35°C).

[0043] (2) In the second step of the process: The air to be processed that has been initially cooled circulates to the first recuperator 6 and is secondarily cooled (air temperature: 5°C) through the a-b process. The cooling method is air heat exchange. The air flowing into the inlet a has a temperature of 35°C, and the air flowing into the inlet g has a temperature of 0°C. Through the heat energy exchange between the air flowing through the inlet a - outlet b and the inlet g - outlet h, the air flowing out of the outlet b has a temperature of 5°C, and the air flowing out of the outlet h has a temperature of 30°C. Some water vapor will be condensed during the heat exchange process and discharged through the solenoid valve five 105 installed on the outer pipeline of the outlet b of the first recuperator 6. The solenoid valve five 105 is controlled by the control system and is periodically opened for drainage, and the air to be processed is secondarily cooled in the first recuperator 6.

[0044] (3) In the third step of the process, the processed air that has been secondarily cooled is circulated to the second recuperator 7 and is tertiarily cooled (air temperature: -80°C, reaching the designed dew point temperature) through the inlet c - outlet d process. The cooling method is air heat exchange. The air flowing into the inlet c has a temperature of 5°C, and the air flowing into the inlet e has a temperature of -85°C. Through the heat energy exchange between the air flowing through the inlet c - outlet d and the inlet e - outlet f, the air flowing out of the outlet d has a temperature of -80°C, and the air flowing out of the outlet f has a temperature of 0°C. Some water vapor will be condensed into frost during the heat exchange process and accumulate in the pipeline near the outlet d, and the air to be processed is tertiarily cooled in the second recuperator 7.

[0045] (4) In the fourth step of the process, the processed air is circulated to the expander 8, where it is depressurized and cooled (air temperature: -85°C). It then passes through the frost catcher 9 and is sent back to the second recuperator 7, and is discharged through the inlet e - outlet f - inlet g - outlet h - the air outlet of the dehumidifier. This process is a heat regeneration process, providing low-temperature guarantee for the secondary cooling and tertiary cooling of the air; A small amount of water vapor will be condensed into frost during the cooling process of the expander 8 and stored in the frost catcher 9.

[0046] This process is an open cycle system.

[0047] Example 3, defrosting heating mode, as Figure 2 and Figure 5 shown.

[0048] The opening condition of the operating mode: The pressure difference detected by the first pressure sensor 12 and the second pressure sensor 13 reaches the set value, that is, the frost amount in the pipeline near the outlet d reaches the set mass, and the defrosting heating mode starts to operate;

[0049] In the described operating mode: Solenoid valve two 102, solenoid valve three 103, and solenoid valve five 105 are closed, solenoid valve one 101, solenoid valve four 104, solenoid valve six 106, and solenoid valve seven 107 are opened. The pipeline between the air inlet g and the outlet of regenerator one 6 is the closed pipeline two 11′, and the pipeline between solenoid valve four 104 and the air inlet g of regenerator one 6 is the closed pipeline one 10′. The fan of the air-cooled heat exchanger 5 is turned off, the expander 8 stops operating, the electric heating device is turned on, and the compressor 4 operates. The equipment starts defrosting, and the operating process is as follows: dehumidifier air inlet - filter - compressor - air inlet a - air outlet b - air inlet c - air outlet d - expander - frost catcher - air inlet e - air outlet f - solenoid valve four.

[0050] (1) In the first step of the described process, external air enters the equipment from the dehumidifier air inlet, passes through the filter 3, and then enters the compressor 4. After being compressed, heated, and pressurized by the compressor 4 (air temperature 70°C), it circulates to regenerator one 6. No heat exchange occurs in regenerator one 6, and the hot air is directly transmitted to regenerator two 7 (air temperature 70°C). Under the dual action of the electric heating device and the high-temperature air, the frost in regenerator two starts to melt into water and is discharged through solenoid valve six 106.

[0051] (2) In the second step of the described process, the high-temperature gas enters the frost catcher 9 through the expander 8. The high-temperature gas gradually melts the frost in the frost catcher 9 into water, which is discharged through the solenoid valve seven 107 set at the lowest point of the bottom of the frost catcher 9.

[0052] (3) In the third step of the described process, the gas passing through the frost catcher exits the equipment through the air inlet e - air outlet f and solenoid valve four 104.

[0053] (4) In the fourth step of the described process, after the pressure difference detected by pressure sensor one 12 and pressure sensor two 13 reaches the set value, this mode ends, and the initial cooling mode or the dehumidification air supply mode starts.

[0054] The instrument of the present utility model adopts a modular design. Under a set of control systems, multiple sets of air circulation systems can be set. The more air circulation systems are set, the faster the air treatment speed and the larger the processing capacity, which can solve the problem of dehumidification in large spaces.

[0055] In the description of the present utility model, the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "vertical", "horizontal", etc. is based on the orientation or positional relationship shown in the drawings. It is only for describing the present utility model and does not require the present utility model to be constructed or operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. The "connected" and "connected" in the present utility model should be understood in a broad sense. For example, it can be a connection or a detachable connection; it can be a direct connection or an indirect connection through an intermediate component. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0056] The above is the preferred operation mode of the present utility model. The description of the specific operation mode is only for better understanding the idea of the present utility model. For those of ordinary skill in the art, several improvements or equivalent substitutions can also be made according to the principle of the present utility model, and these improvements or equivalent substitutions are also regarded as falling within the protection scope of the present utility model.

Claims

1. A multi-stage heat recovery dehumidifier based on an air expansion refrigeration cycle, comprising a compressor, an expander, and an air-cooled heat exchanger, characterized in that: It also includes air circulation systems and control systems; The air circulation system comprises a dehumidifier air outlet (1), a dehumidifier air inlet (2), a compressor (4), an air-cooled heat exchanger (5), a regenerator 1 (6), a regenerator 2 (7), an expander (8), a pipeline 1 (10) and a pipeline 2 (11); the dehumidifier air inlet (2) is connected to the air inlet of the compressor (4) via the pipeline 2 (11); the air outlet of the compressor (4) is connected to the air inlet of the air-cooled heat exchanger (5) via the pipeline 2 (11); the air outlet of the air-cooled heat exchanger (5) is connected to the air inlet of the regenerator 1 (6) via the pipeline 2 (11); air port a, the air outlet h of the regenerator 1 (6) is connected to the air outlet (1) of the dehumidifier through the pipe 2 (11), the air outlet b is connected to the air inlet c of the regenerator 2 (7) through the pipe 1 (10), the air inlet g is connected to the air inlet f of the regenerator 2 (7) through the pipe 1 (10), the air outlet d of the regenerator 2 (7) is connected to the air inlet of the expander (8) through the pipe 1 (10), the air inlet e is connected to the air outlet of the expander (8) through the pipe 1 (10), and the pipe 2 (11) is arranged between the air outlet (1) of the dehumidifier and the air inlet (2) of the dehumidifier; The control system comprises an external program control module, a pressure sensor (12) arranged on the pipe (10) at the air inlet (c) of the second heat exchanger (7), a pressure sensor (13) and a temperature sensor (14) arranged on the pipe (10) at the air outlet (d) of the second heat exchanger (7).

2. The multi-stage heat recovery dehumidifier based on air expansion refrigeration cycle according to claim 1 is characterized in that: A filter (3) is provided at the air inlet (2) of the dehumidifier.

3. The multi-stage heat recovery dehumidifier based on air expansion refrigeration cycle according to claim 1, characterized in that: The compressor (4) and the expander (8) adopt the same bearing design, and the bearing adopts an oil-free air suspension bearing.

4. The multi-stage heat recovery dehumidifier based on air expansion refrigeration cycle according to claim 1, characterized in that: A two-way pipe (11) is arranged inside the regenerator (6), one cooling and dehumidifying pipe (11) is located between the air inlet a and the air outlet b, and the other is a cold air supply pipe (11) is located between the air inlet g and the air outlet h.

5. The multi-stage heat recovery dehumidifier based on air expansion refrigeration cycle according to claim 1, characterized in that: A two-way pipe (11) is arranged inside the second regenerator (7), one cooling and dehumidifying pipe (11) is located between the air inlet c and the air outlet d, and the other is a cold air supply pipe (11) is located between the air inlet e and the air outlet f.

6. The multi-stage heat recovery dehumidifier based on air expansion refrigeration cycle according to claim 1, characterized in that: An electric heating device is provided on the second pipe (11) between the air inlet c and the air outlet d in the second regenerator (7).

7. The multi-stage heat recovery dehumidifier based on air expansion refrigeration cycle according to claim 1, characterized in that: A frost catcher (9) is provided at the outlet of the expander (8), and the air outlet of the frost catcher (9) is connected to the air inlet e of the second heater (7) through a pipe one (10).

8. The multi-stage heat recovery dehumidifier based on air expansion refrigeration cycle according to claim 1, characterized in that: Solenoid valve one (101), solenoid valve two (102), solenoid valve three (103), solenoid valve four (104), solenoid valve five (105), solenoid valve six (106) and solenoid valve seven (107) are arranged on the pipeline one (10) and the pipeline two (11), and the arrangement positions are as follows: solenoid valve one (101) is arranged on pipeline two (11) at the outlet of the filter (3); solenoid valve two (102) is arranged on pipeline two (11) at the air outlet (1); solenoid valve one (101) is arranged on pipeline two (11) at the air inlet (2); A solenoid valve three (103) is arranged on the pipe two (11) between the first heat exchanger (6) and the air outlet (1); a solenoid valve four (104) is arranged on the heat recovery loop pipe one (10) between the first heat exchanger (6) and the second heat exchanger (7); a solenoid valve five (105) is arranged on the pipe one (10) outside the air outlet b of the first heat exchanger (6); a solenoid valve six (106) is arranged on the pipe one (10) outside the air outlet d of the second heat exchanger (7); and a solenoid valve seven (107) is arranged at the lowest point of the bottom of the frost catcher (9).

9. The multi-stage heat recovery dehumidifier based on air expansion refrigeration cycle according to claim 1, characterized in that: The surface of the first pipe (10) is wrapped with a heat-insulating material; and the surfaces of the second regenerator (7), the expander (8) and the frost catcher (9) are wrapped with a heat-insulating material.

10. The multi-stage heat recovery dehumidifier based on air expansion refrigeration cycle according to claim 1, characterized in that: The air circulation system can be arranged in multiple groups in parallel.

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