High-temperature heat pump rotary dehumidifier

Abstract

The invention discloses a high-temperature heat pump rotary dehumidifier, and belongs to the technical field of dehumidifiers. The invention provides a high-temperature heat pump rotary dehumidifier. The high-temperature heat pump rotary dehumidifier comprises a dehumidification rotary wheel and a cascade type high-temperature heat pump used for providing regeneration air for a regeneration area of the dehumidification rotary wheel. The cascade high-temperature heat pump comprises an evaporator, a low-stage compressor, a heat exchanger, a high-stage compressor and a condenser; the evaporator, the low-stage compressor and the heat exchanger are connected in series to form a low-pressure loop, and the heat exchanger, the high-stage compressor and the condenser are connected in series to form a high-pressure loop. The cascade high-temperature heat pump is adopted to provide regeneration air for regeneration of the dehumidification rotating wheel, high air outlet temperature can be provided to meet the regeneration requirement of the dehumidification rotating wheel, meanwhile, a traditional mode completely depending on steam heating and electric heating is abandoned, and the overall energy consumption of the rotating wheel dehumidifier can be remarkably reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of dehumidifiers, and particularly relates to a high-temperature heat pump rotary dehumidifier. Background Art

[0002] In industrial production fields such as lithium battery production, food production, precision instruments, chemical industry, and medicine, if the humidity is not controlled, it will seriously affect the product quality. Among various dehumidification methods, the rotary dehumidifier with good dehumidification performance is widely used. The rotary dehumidifier uses a honeycomb-structured dehumidification rotor to adsorb and process water vapor in the air and reduce the air humidity. During the dehumidification process, the dehumidification rotor slowly rotates driven by a driving device. When the dehumidification rotor reaches the saturation state of adsorbing water molecules in the adsorption area, it enters the regeneration area for desorption and regeneration by high-temperature air. This process repeats continuously, and dry air is continuously generated and sent into the specified space after temperature adjustment to achieve the purpose of controlling temperature and humidity.

[0003] Currently, the commonly used regeneration heating methods for industrial rotary dehumidifiers are electric heating and steam heating. For example, the Chinese utility model patent with the application number 201720331376.X discloses a rotary regeneration energy-saving system for a dehumidifier, including a steam regeneration heater. A first pipe connected to the air inlet end of the regeneration area passes through the steam regeneration heater. The inlet end of the steam regeneration heater is connected to the steam supply main pipe through a second pipe. The rotary regeneration energy-saving system also includes a condensate recovery heat exchanger. The first pipe passes through the condensate recovery heat exchanger before passing through the steam regeneration heater. The outlet end of the steam regeneration heater is connected to the inlet end of the condensate recovery heat exchanger through a third pipe. This system improves the utilization rate of steam, enables the regeneration gas to reach a higher temperature, thereby improving the regeneration effect and reducing the use cost. However, these commonly used regeneration heating methods only account for about half of the total energy consumption of the industrial rotary dehumidifier in terms of regeneration energy consumption, and the energy consumption is relatively large. At the same time, the current electricity load of air-conditioning refrigeration and dehumidification equipment has accounted for more than 1 / 5 of the total grid load. Therefore, researching a more energy-saving and efficient regeneration heating method for rotary dehumidifiers is of great value for improving the economic benefits of enterprises and national low-carbon environmental protection. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a high-temperature heat pump rotary dehumidifier that can reduce the energy consumption of the rotary dehumidifier.

[0005] To solve the above technical problems, the technical solution adopted by the present invention is as follows: A high-temperature heat pump rotary dehumidifier includes a dehumidification rotor and a cascade high-temperature heat pump for supplying regeneration air to the regeneration area of the dehumidification rotor; the cascade high-temperature heat pump includes an evaporator, a low-stage compressor, a heat exchanger, a high-stage compressor, and a condenser; the evaporator, the low-stage compressor, and the heat exchanger are connected in series to form a low-pressure circuit, and the heat exchanger, the high-stage compressor, and the condenser are connected in series to form a high-pressure circuit.

[0006] The beneficial effects of the present invention are as follows: The rotary dehumidifier provided by the present invention uses a cascade high-temperature heat pump to supply regeneration air for the regeneration of the dehumidification rotor, which can provide a relatively high outlet air temperature to meet the regeneration requirements of the dehumidification rotor. At the same time, it abandons the traditional mode that completely relies on steam heating and electric heating, and can significantly reduce the overall energy consumption of the equipment. The cascade high-temperature heat pump can be integrated in a separate box body. In practical applications, only the box body equipped with the cascade high-temperature heat pump needs to be connected to the corresponding position of the rotary dehumidifier through an air duct. The position is relatively free, the installation is convenient, and it is convenient to carry out energy-saving transformation on the existing rotary dehumidifier. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 is the working principle diagram of a high-temperature heat pump rotary dehumidifier according to a specific embodiment of the present invention; Figure 2 is the structural schematic diagram of a high-temperature heat pump rotary dehumidifier according to a specific embodiment of the present invention; Figure 3 is the working principle diagram of another high-temperature heat pump rotary dehumidifier according to a specific embodiment of the present invention; Figure 4 is the structural schematic diagram of another high-temperature heat pump rotary dehumidifier according to a specific embodiment of the present invention; Reference Numeral Explanation: 1, evaporator; 2, low-stage compressor; 3, heat exchanger; 4, high-stage compressor; 5, condenser; 6, primary filter; 7, dehumidification rotor; 71, regeneration area; 72, dehumidification area; 8, heat exchanger; 9, auxiliary heater. SPECIFIC EMBODIMENTS

[0008] To describe the technical content, the achieved objectives, and the effects of the present invention in detail, the following is described in conjunction with the embodiments and with reference to the accompanying drawings.

[0009] Please refer to Figures 1 to 4 , a high-temperature heat pump rotary dehumidifier, including a dehumidification rotor and a cascade high-temperature heat pump for supplying high-temperature and low-humidity regeneration air to the regeneration area of the dehumidification rotor; the cascade high-temperature heat pump includes an evaporator, a low-stage compressor, a heat exchanger, a high-stage compressor, and a condenser; the evaporator, the low-stage compressor, and the heat exchanger are connected in series to form a low-pressure circuit, and the heat exchanger, the high-stage compressor, and the condenser are connected in series to form a high-pressure circuit.

[0010] As can be seen from the above description, the beneficial effects of the present invention are as follows: By adopting a cascade high-temperature heat pump, the temperature of the regenerated air can be effectively increased, enabling it to basically or fully meet the requirements for the regeneration of the dehumidifying rotor. Compared with traditional steam heating or electric heating, the energy consumption required for the regeneration of the dehumidifying rotor can be significantly reduced.

[0011] Refer to Figures 1 to 2 , in one or more embodiments, a primary filter and a supply air fan are sequentially provided in front of the evaporator. The supply air fan can specifically be an axial flow fan, which is used to perform primary filtration on the fresh air drawn from the outside.

[0012] Refer to Figures 1 to 2 , in one or more embodiments, the high-temperature heat pump rotary dehumidifier has a first fresh air duct and a second fresh air duct; The first fresh air duct is sequentially provided with an evaporator and the dehumidification area of the dehumidifying rotor; The second fresh air duct is sequentially provided with a condenser and the regeneration area of the dehumidifying rotor.

[0013] For the above-mentioned cascade high-temperature heat pump, the fresh air on the first fresh air duct is cooled after passing through the evaporator. This part of the fresh air is directly sent into the front surface cooler section of the rotary dehumidifier, that is, it is first cooled in front of the surface cooler between the evaporator and the dehumidification area of the dehumidifying rotor, which can greatly reduce the cooling load required for the front surface cooler section of the rotary dehumidifier. And the fresh air on the second fresh air duct, after passing through the condenser, the temperature rises above 95 °C and can be sent into the regeneration area of the dehumidifying rotor. Compared with directly heating the fresh air to the regeneration temperature, the high-temperature steam and electric energy consumption required for the regeneration process of the rotary dehumidifier are greatly reduced.

[0014] Refer to Figures 3 to 4 , in one or more embodiments, it further includes a heat exchanger; the heat exchanger is used to recover the heat of the exhaust air discharged from the regeneration area of the dehumidifying rotor and exchange heat with the fresh air passing through the evaporator. Preferably, the heat exchanger is an aluminum foil core heat recovery device.

[0015] Refer to Figures 3 to 4 , in one or more embodiments, the high-temperature heat pump rotary dehumidifier has a fresh air duct and a return air duct; The fresh air duct is sequentially provided with an evaporator, a heat exchanger, a condenser and the regeneration area of the dehumidifying rotor; The return air duct is sequentially provided with the regeneration area of the dehumidifying rotor and a heat exchanger.

[0016] The return air duct is the heat recovery air duct for the regeneration exhaust air of the dehumidifying rotor, which is used to recover the waste heat of the exhaust air and preheat the fresh air.

[0017] Refer to Figures 3 to 4, in one or more embodiments, the heat exchanger includes a fresh air duct and a return air duct; the fresh air passes through the evaporator and then enters the condenser through the fresh air duct; the return air discharged from the regeneration area of the dehumidifying rotor is discharged through the return air duct; the fresh air and the return air achieve heat exchange in the heat exchanger. The heat exchanger is an "air-air" heat exchanger. The fresh air is cooled after passing through the evaporator, then enters the heat exchanger, exchanges heat with the high-temperature and high-humidity gas discharged from the regeneration area of the dehumidifying rotor, is heated up and enters the condenser, and is further heated after passing through the condenser and then enters the regeneration area of the dehumidifying rotor.

[0018] For the above-mentioned cascade high-temperature heat pump, the fresh air in the fresh air duct (such as 35°C, relative humidity 75%) first passes through the evaporator in the low-pressure circuit. The evaporator absorbs the heat of the fresh air, cools and dehumidifies it. Then the fresh air cooled to 20°C enters the "air-air" heat exchanger and exchanges heat with the return air discharged from the 55°C regeneration area in the heat exchanger, and the temperature of the fresh air rises to about 40°C. At the same time, the heat of the regenerated fresh air absorbed by the evaporator is discharged to the heat exchanger. At this time, the condensation temperature on the condensation side of the low-pressure stage compression system is about 60°C. As the evaporation side of the high-pressure stage compression system, the condensation temperature of the high-pressure stage can reach about 105°C. After recovering the heat, the fresh air at about 40°C is heated to about 100°C after passing through the condenser and then can be sent to the regeneration area of the dehumidifying rotor. Without relying on any electric heaters or steam heaters, the regeneration of the dehumidifying rotor can be realized, greatly reducing the energy consumption required in the regeneration process of the rotary dehumidifier. At the same time, due to the use of the regenerated exhaust air from the dehumidifying rotor, the evaporation temperature of the heat pump system is increased, the heat absorption of the system is larger, the compressor power consumption of the cascade heat pump system is reduced, and the COP value of the system is improved.

[0019] Refer to Figure 2 and 4 , in one or more embodiments, an auxiliary heater is further included, and an auxiliary heater is provided between the condenser and the regeneration area of the dehumidifying rotor. The auxiliary heater is used to further heat the fresh air heated by the cascade high-temperature heat pump. According to the actual required regeneration temperature, further heating or not using the auxiliary heater can be selected.

[0020] In one or more embodiments, the temperature of the fresh air after passing through the cascade high-temperature heat pump rises above 95°C.

[0021] In one or more embodiments, different refrigerants are used in the low-pressure circuit and the high-pressure circuit. Specifically, the refrigerant used in the low-pressure circuit is R410A, and the refrigerant used in the high-pressure circuit is R245fa. The low-pressure stage circuit uses R410A refrigerant and a DC variable frequency system to adjust the load; the high-pressure stage circuit uses R245fa refrigerant, and its critical temperature is 153.9°C, and theoretically the highest outlet air temperature can reach about 145°C.

[0022] Refer toFigures 1 to 2 , Embodiment 1 of the present invention is as follows: A high-temperature heat pump rotary dehumidifier includes a dehumidifier, a cascade high-temperature heat pump, and an auxiliary heater; the cascade high-temperature heat pump is used to provide high-temperature and low-humidity regeneration air to the dehumidifier; The dehumidifier includes a front surface cooler, a dehumidification rotor 7, and a rear surface cooler; One end of the auxiliary heater is connected to the air inlet of the regeneration area of the dehumidification rotor 7 of the dehumidifier, and the other end is connected to the air outlet of the condenser 5 of the cascade high-temperature heat pump; The cascade high-temperature heat pump includes a primary filter 6, a supply axial flow fan, an evaporator 1, a low-stage compressor 2, a heat exchanger 3, a high-stage compressor 4, and a condenser 5; the evaporator 1, the low-stage compressor 2, and the heat exchanger 3 are connected in series to form a low-pressure circuit, and the heat exchanger 3, the high-stage compressor 4, and the condenser 5 are connected in series to form a high-pressure circuit; the refrigerant used in the low-pressure circuit is R410A, and the refrigerant used in the high-pressure circuit is R245fa; The high-temperature heat pump rotary dehumidifier includes a first fresh air duct, a second fresh air duct, and a third fresh air duct; The first fresh air duct is sequentially provided with a primary filter 6, a supply axial flow fan, an evaporator 1, a front surface cooler, and the dehumidification area 72 of the dehumidification rotor 7; The second fresh air duct is sequentially provided with a condenser 5 and the regeneration area of the dehumidification rotor 7; The third fresh air duct is sequentially provided with a primary efficiency filter, a front surface cooler, the dehumidification area 72 of the dehumidification rotor 7, and a rear surface cooler; The fresh air entering the first fresh air duct, under the action of the supply axial flow fan, first passes through the primary filter 6 for filtration, then enters the evaporator 1, is cooled by the evaporator 1 and then sent to before the front surface cooler of the dehumidifier, mixes with the fresh air entering the third fresh air duct and filtered by the primary efficiency filter, and then passes through the front surface cooler of the dehumidifier, the dehumidification area 72 of the dehumidification rotor 7, and the rear surface cooler in sequence and is sent to the workshop; the fresh air entering the second fresh air duct enters the condenser 5, is heated by the condenser 5 and then enters the auxiliary heater, is heated again and then enters the regeneration area of the dehumidification rotor 7 for the regeneration of the dehumidification rotor 7.

[0023] , Embodiment 2 of the present invention is as follows: On the basis of Embodiment 1, the fresh air at 35°C and 75% RH enters the first fresh air duct, the second fresh air duct, and the third fresh air duct respectively; The fresh air entering the first fresh air duct is cooled to 20°C after passing through the evaporator 1, then mixes with the fresh air entering the second fresh air duct, and then passes through the front surface cooler, the dehumidification area 72 of the dehumidification rotor 7, and the rear surface cooler in sequence and is sent to the workshop; The fresh air entering the second fresh air duct is heated, dehumidified to 95°C and 0.4% RH after passing through the condenser 5, then enters the auxiliary heater and is heated to 100°C, and finally is sent to the regeneration area of the dehumidification wheel 7. After the regeneration of the dehumidification wheel 7 is realized, it is discharged outdoors.

[0024] When the regeneration air volume is 4000 m³ / h, the high-temperature heat pump dehumidification wheel of Example 1 is adopted, and the heating energy consumption is saved by 47% compared with the electric heating cost of the dehumidification wheel and 23% compared with the steam heating cost.

[0025] Refer to Figures 3 to 4 , Example 3 of the present invention is as follows: A high-temperature heat pump dehumidification wheel, comprising a dehumidifier and a cascade high-temperature heat pump; the cascade high-temperature heat pump is used to provide high-temperature and low-humidity regeneration air for the dehumidifier; The dehumidifier includes a primary filter, a front surface cooler, a dehumidification wheel 7 and a rear surface cooler; The cascade high-temperature heat pump includes a primary filter 6, a supply air axial flow fan, an evaporator 1, a low-stage compressor 2, a heat exchanger 3, a high-stage compressor 4, a condenser 5 and an aluminum foil core heat recovery device (heat exchanger 8); the evaporator 1, the low-stage compressor 2 and the heat exchanger 3 are connected in series to form a low-pressure circuit, and the heat exchanger 3, the high-stage compressor 4 and the condenser 5 are connected in series to form a high-pressure circuit; the refrigerant used in the low-pressure circuit is R410A, and the refrigerant used in the high-pressure circuit is R245fa; The high-temperature heat pump dehumidification wheel includes a fresh air duct, a return air duct and a dehumidified air duct; On the fresh air duct, there are successively arranged a primary filter 6, a supply air axial flow fan, an evaporator 1, an aluminum foil core heat recovery device, a condenser 5 and the regeneration area 71 of the dehumidification wheel 7; On the return air duct, there are successively arranged the regeneration area 71 of the dehumidification wheel 7 and a heat exchanger 8; The aluminum foil core heat recovery device includes a fresh air duct and a return air duct; the fresh air passes through the evaporator 1 and then enters the condenser 5 through the fresh air duct; the return air discharged from the regeneration area 71 of the dehumidification wheel 7 is discharged through the return air duct; the fresh air and the return air realize heat exchange in the aluminum foil core heat recovery device; On the dehumidified air duct, there are successively arranged a primary filter, a front surface cooler, the dehumidification area 72 of the dehumidification wheel 7 and a rear surface cooler; The fresh air entering the fresh air duct is first filtered by the primary filter 6 under the action of the supply axial flow fan, then enters the evaporator 1. After being cooled by the evaporator 1, it enters the fresh air duct of the aluminum foil core heat recovery unit. At the same time, the return air discharged from the regeneration area 71 of the dehumidification wheel 7 is sent into the return air duct. The fresh air and the return air exchange heat in the aluminum foil core heat recovery unit; subsequently, the return air is discharged to the outside, and the heated fresh air enters the condenser 5. After being heated by the condenser 5, it is sent to the regeneration area 71 of the dehumidification wheel 7 to realize the regeneration of the dehumidification wheel 7, and then becomes the return air and is sent into the return air duct; The fresh air entering the dehumidification air duct passes through the primary filter, the front surface cooler, the dehumidification wheel 7 and the rear surface cooler in sequence and is sent into the workshop.

[0026] Embodiment 4 of the present invention is as follows: On the basis of Embodiment 3, the fresh air at 35°C and 75% RH is respectively sent into the fresh air duct and the dehumidification air duct; The fresh air entering the fresh air duct is cooled to 20°C after passing through the evaporator 1, and then enters the aluminum foil core heat recovery unit. The return air at 55°C discharged from the dehumidification wheel 7 also enters the aluminum foil core heat recovery unit. After heat exchange, the return air is discharged outdoors at 45°C, while the fresh air is heated to 40°C and then enters the condenser 5. After being heated by the condenser 5, it reaches 100°C, and finally is sent to the regeneration area of the dehumidification wheel 7. After realizing the regeneration of the dehumidification wheel 7, it becomes the return air and is sent into the aluminum foil core heat recovery unit. When the regeneration air volume is 4000 m³ / h, using the high-temperature heat pump dehumidification wheel of Embodiment 3, the heating energy consumption is saved by 58% compared with the electric heating cost of the dehumidification wheel and 38% compared with the steam heating cost.

[0027] In summary, for the commonly used regeneration heating method, only the regeneration energy consumption accounts for about half of the total energy consumption of the industrial rotary dehumidifier, indicating a huge energy-saving potential. At the same time, the temperature of the regenerated air is about 50°C, which has the value of recycling. Directly discharging it outdoors also causes energy waste. The high-temperature heat pump rotary dehumidifier provided by the present invention abandons the traditional method of relying entirely on steam heating and electric heating to realize the regeneration of the rotary wheel, and introduces a cascade high-temperature heat pump to produce high-temperature regeneration air. The cascade high-temperature heat pump can provide a higher outlet air temperature by using two-stage compression, which can greatly reduce the energy consumption of the rotary dehumidifier. At the same time, it can realize the heat recovery of the regeneration exhaust air of the rotary dehumidifier, avoid energy waste, and achieve energy-saving and environmental-friendly green production. At the same time, for the high-temperature heat pump rotary dehumidifier provided by the present invention, there is no need for users to purchase brand-new equipment. The cascade high-temperature heat pump can be centrally installed in a modular box body, and the box body is provided with convenient interfaces for corresponding pipelines. During the construction site, it can be connected to the existing rotary dehumidifier through an air duct, so as to carry out energy-saving transformation for the current huge market. For example, for a large lithium battery workshop, the cost of adding a single cascade high-temperature heat pump is only about 1 / 4 of that of a new device, but the cost of regenerative heating required for a single rotary dehumidifier that can be reduced annually is more than 3 times that of adding a cascade high-temperature heat pump, which can greatly reduce the operating cost of enterprises.

[0028] The above are only the embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in the relevant technical fields, shall be similarly included in the patent protection scope of the present invention.

Claims

1. A high-temperature heat pump rotary dehumidifier, characterized in that: It includes a dehumidification wheel and a cascade high-temperature heat pump for providing regeneration air to the regeneration zone of the dehumidification wheel; the cascade high-temperature heat pump includes an evaporator, a low-stage compressor, a heat exchanger, a high-stage compressor and a condenser; the evaporator, the low-stage compressor and the heat exchanger are connected in series to form a low-pressure circuit, and the heat exchanger, the high-stage compressor and the condenser are connected in series to form a high-pressure circuit.

2. The high-temperature heat pump rotary dehumidifier according to claim 1, characterized in that: A primary filter and an air supply fan are sequentially arranged in front of the evaporator.

3. The high-temperature heat pump rotary dehumidifier according to claim 1, characterized in that: It has a first fresh air passage and a second fresh air passage; The first fresh air path is provided with a dehumidification zone of an evaporator and a dehumidification wheel in sequence; The second fresh air path is provided with a condenser and a regeneration zone of a dehumidification wheel in sequence.

4. The high-temperature heat pump rotary dehumidifier according to claim 1, characterized in that: It also includes a heat exchanger; the heat exchanger is used to recover the heat of the exhaust air discharged from the regeneration area of ​​the dehumidification wheel and exchange heat with the fresh air passing through the evaporator.

5. The high-temperature heat pump rotary dehumidifier according to claim 4, characterized in that: It has fresh air path and return air path; The fresh air path is provided with an evaporator, a heat exchanger, a condenser and a regeneration zone of a dehumidification wheel in sequence; The return air path is provided with a regeneration zone of a dehumidification wheel and a heat exchanger in sequence.

6. The high-temperature heat pump rotary dehumidifier according to claim 5, characterized in that: The heat exchanger includes a fresh air duct and a return air duct; the fresh air passes through the evaporator and enters the condenser through the fresh air duct; the return air discharged from the regeneration area of ​​the dehumidification wheel is discharged through the return air duct; The fresh air and the return air exchange heat in the heat exchanger.

7. The high-temperature heat pump rotary dehumidifier according to claim 4, characterized in that: The heat exchanger is an aluminum foil core heat recovery device.

8. The high-temperature heat pump rotary dehumidifier according to claim 1, characterized in that: The temperature of the fresh air after passing through the cascade high-temperature heat pump rises to above 95°C.

9. The high-temperature heat pump rotary dehumidifier according to claim 1, characterized in that: It also includes an auxiliary heater, which is used to further heat the fresh air after being heated by the cascade high-temperature heat pump.

10. The high-temperature heat pump rotary dehumidifier according to claim 1, characterized in that: The low-pressure circuit and the high-pressure circuit use different refrigerants.

Images