Compressed air and steam cogeneration plant

Abstract

The present invention provides a compressed air and steam co-generation device, comprising: an air compressor body; an oil-gas cylinder, connected to the air compressor body, for separating compressed air and lubricating oil; a lubricating oil circulation path, connected to the air compressor body and the oil-gas cylinder in sequence; an evaporator, connected to the lubricating oil circulation path; a refrigerant circulation path, connected to the evaporator; a condenser, connected to the refrigerant circulation path; a steam forming path, connected to the condenser; wherein the lubricating oil of the air compressor body enters the lubricating oil circulation path, the lubricating oil on the lubricating oil circulation path and the refrigerant on the refrigerant circulation path perform heat exchange in the evaporator, and the refrigerant on the refrigerant circulation path and the water on the steam forming path perform heat exchange in the condenser to form steam. No additional heat source or complex energy conversion link is required, thereby improving energy utilization efficiency, simplifying the system structure, and reducing equipment cost and floor space.

Description

Technical Field

[0001] The invention relates to a compressed air and steam co-generation device. Background Art

[0002] At present, the demand for compressed air and steam in industrial production is growing. Compressed air is widely used in pneumatic tools, automatic control, spraying, cleaning and other fields, while steam plays an important role in heating, drying, sterilization, power generation and other fields. Traditionally, compressed air and steam are produced independently, that is, using air compressors and steam boilers for production respectively. This method has problems such as low energy utilization efficiency, large equipment investment, and large land occupation. Therefore, how to improve energy utilization efficiency, reduce production costs, and reduce equipment footprint has become an important issue that needs to be solved in the field of compressed air and steam production.

[0003] In recent years, with the increasing awareness of energy conservation and environmental protection, energy recovery technology has received more and more attention. In the process of compressed air production, air compressors generate a lot of waste heat, which is usually discharged into the environment, resulting in energy waste. In order to improve energy efficiency, some researchers have begun to explore the recycling of waste heat generated in the compressed air production process for steam production, thereby achieving the co-production of compressed air and steam.

[0004] The existing compressed air and steam cogeneration technology mainly includes a cogeneration system based on a thermal power unit. This type of system uses the steam generated by the thermal power unit as a heat source to drive a steam turbine or a back pressure machine to generate electricity, and the waste heat generated is used for steam production. For example, Document 1 (Application Publication Number: CN113339774A) discloses a multi-energy cogeneration system and a regulation method based on the cascade utilization of steam from a thermal power unit. The system includes a boiler, a steam turbine, a condenser, a cooling tower, a circulating water pump, a rotating baffle, a back pressure machine, an air compressor, an air purification device, an air cooling device, an air energy storage device, an air heating device, a steam user and a compressed air user. Its technical solution is to use the high-parameter reheated steam of the steam turbine to first produce compressed air, and then to meet the needs of steam users; at the same time, on the low-pressure steam user side, the steam energy is recycled to produce compressed air energy, and then meet the needs of low-pressure steam users. In addition, the system also uses an air energy storage device to meet the peak load requirements of the power grid.

[0005] However, the above-mentioned prior art solutions have the following technical problems:

[0006] Complex system and high investment cost: Cogeneration systems based on thermal power units are usually large in scale and complex in structure. They need to be equipped with large equipment such as boilers and steam turbines. They have high investment costs and complex operation and maintenance. They are not suitable for small and medium-sized enterprises or independent compressed air stations. For example, the system in Reference 1 is too complex, containing a large number of components and complex control logic, resulting in high system costs and difficulty in popularization and application.

[0007] There are many energy conversion links and large efficiency losses: In the cogeneration system based on thermal power units and absorption refrigeration, energy needs to undergo multiple conversions, such as steam-mechanical energy-electric energy-thermal energy. Each link will produce energy losses, resulting in low overall energy utilization efficiency.

[0008] Low control accuracy: Existing cogeneration systems usually lack precise control over compressed air and steam parameters, making it difficult to meet the needs of different users. For example, although Document 1 can achieve multi-energy cogeneration, its control strategy is mainly focused on grid peak regulation, and the control accuracy of compressed air and steam parameters is limited, making it difficult to meet users' needs for steam at different temperatures and pressures. At the same time, Document 1 does not mention the control of the lubricating oil temperature of the air compressor, which may affect the operating efficiency and service life of the compressor.

[0009] Poor adaptability: Existing cogeneration systems usually rely on specific heat sources or operating conditions, have poor adaptability, and are difficult to promote and apply to different occasions. Summary of the invention

[0010] The present invention aims to solve the problems existing in the above-mentioned prior art and provide a compressed air and steam co-generation device with simple structure, low cost, precise control and strong adaptability. The present invention cleverly uses the lubricating oil of the air compressor itself as a heat exchange medium, and recycles the waste heat generated by the compressor through the refrigerant circulation for steam production.

[0011] The present invention solves the above technical problems by the following means. The present invention provides a compressed air and steam co-generation device, comprising: an air compressor body; an oil-gas cylinder, which is connected to the air compressor body and is used to separate compressed air and lubricating oil; a lubricating oil circulation path, which is sequentially connected to the air compressor body and the oil-gas cylinder; an evaporator, which is connected to the lubricating oil circulation path; a refrigerant circulation path, which is connected to the evaporator; a condenser, which is connected to the refrigerant circulation path; and a steam forming path, which is connected to the condenser; wherein the lubricating oil of the air compressor body enters the lubricating oil circulation path, the lubricating oil on the lubricating oil circulation path and the refrigerant on the refrigerant circulation path are heat-exchanged in the evaporator, and the refrigerant on the refrigerant circulation path and the water on the steam forming path are heat-exchanged in the condenser to form steam. The device realizes the co-generation of compressed air and steam by introducing the high-temperature lubricating oil discharged from the air compressor into the evaporator, heating the refrigerant, and transferring heat to water to generate steam by using the refrigerant circulation. This design cleverly utilizes the air compressor's own lubricating oil circulation, without the need for additional heat sources or complex energy conversion links, thereby improving energy efficiency, simplifying the system structure, and reducing equipment costs and floor space.

[0012] Preferably, the refrigerant circulation path includes a variable frequency compressor. By adjusting the power of the refrigerant circulation through the variable frequency compressor, the steam output and temperature can be accurately controlled to meet the needs of different users, further improve energy utilization efficiency, and enhance the flexibility of the device.

[0013] Preferably, the lubricating oil circulation path also includes: a temperature sensor for detecting the lubricating oil temperature; a temperature control valve, whose inlet is connected to the outlet of the evaporator, whose first outlet is connected to the inlet of the air-cooled / water-cooled heat exchanger, and whose second outlet is connected to the outlet of the air-cooled / water-cooled heat exchanger, and the temperature control valve controls the flow of lubricating oil flowing through the air-cooled / water-cooled heat exchanger according to the detection result of the temperature sensor.

[0014] Through the temperature control valve and air-cooled / water-cooled heat exchanger, the temperature of the lubricating oil can be accurately controlled to ensure the stable operation of the air compressor, extend its service life, and improve the reliability of the system.

[0015] Preferably, the lubricating oil circulation path further includes: an oil filter located after the air-cooled / water-cooled heat exchanger, for filtering the lubricating oil. The oil filter can remove impurities in the lubricating oil, improve the cleanliness of the lubricating oil, further protect the air compressor, extend its service life, and reduce maintenance costs.

[0016] Preferably, the steam forming path includes: a vapor-liquid separator and a pump connected to the condenser, and the pump is connected between the vapor-liquid separator and the condenser. The combination of the vapor-liquid separator and the pump can effectively separate steam and water, accurately control the temperature and pressure of the steam, meet the needs of different users, and improve the quality of steam.

[0017] Preferably, when the variable frequency compressor stops running, the temperature control valve controls the flow of lubricating oil flowing through the air-cooled / water-cooled heat exchanger according to the lubricating oil temperature detected by the temperature sensor. When the lubricating oil temperature is lower than or equal to the target temperature, the temperature control valve prevents the lubricating oil from flowing through the air-cooled / water-cooled heat exchanger; when the lubricating oil temperature is higher than the target temperature, the temperature control valve controls a portion of the lubricating oil to flow through the air-cooled / water-cooled heat exchanger. This control strategy allows the lubricating oil temperature to be accurately controlled even when steam preparation is not required, further improving the flexibility of system operation and energy efficiency, and reducing unnecessary energy consumption.

[0018] Preferably, the refrigerant circulation path further includes: a throttling device located between the condenser and the evaporator. The addition of the throttling device allows the refrigerant to be throttled and depressurized before entering the evaporator, thereby improving the refrigeration efficiency, thereby increasing the steam yield and reducing energy consumption.

[0019] Preferably, the variable frequency compressor adjusts its operating frequency according to the lubricating oil temperature detected by the temperature sensor. When the lubricating oil temperature is lower than the target temperature, the variable frequency compressor reduces the operating frequency to reduce the heat exchange in the evaporator; when the lubricating oil temperature is higher than the target temperature, the variable frequency compressor increases the operating frequency to increase the heat exchange in the evaporator. This control strategy of adjusting the operating frequency of the variable frequency compressor according to the lubricating oil temperature realizes the precise control of the lubricating oil temperature and steam production, improves the response speed and stability of the system, and further optimizes the energy utilization efficiency.

[0020] Preferably, the air compressor further comprises an air filter connected to the air compressor body and used to filter the air entering the air compressor body. The use of the air filter can effectively remove impurities in the air, improve the quality of the compressed air, protect the air compressor, extend its service life, and reduce maintenance costs.

[0021] Preferably, in the lubricating oil circulation path, the oil cylinder is located between the air compressor body and the evaporator, and the temperature control valve is located between the evaporator and the oil filter. This arrangement of components optimizes the circulation path of the lubricating oil, improves the heat exchange efficiency, and simplifies the system structure, making it more compact and easier to maintain.

[0022] The present invention builds a bridge connecting the air compression system and the refrigerant cycle by cleverly utilizing the lubricating oil of the air compressor itself as a heat exchange medium. After the lubricating oil comes out of the air compressor, it carries a large amount of waste heat. The present invention does not directly discharge this waste heat into the environment, but instead introduces it into the evaporator to heat the refrigerant for steam generation. This method effectively recovers the waste heat generated in the compressed air production process, realizes the co-production of compressed air and steam, and thus solves the problems of low energy utilization efficiency, complex system, high cost, etc. in the prior art. Since the lubricating oil itself circulates in the air compressor, using it as a heat exchange medium does not require an additional pump or piping system, simplifies the system structure, reduces costs, and improves reliability. At the same time, the present invention also realizes precise control of the lubricating oil temperature and steam parameters through control means such as variable frequency compressors and temperature control valves, further improves the energy utilization efficiency and the flexibility of system operation, and better meets the diverse needs of users. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic structural diagram of a compressed air and steam cogeneration device according to one embodiment of the present invention. DETAILED DESCRIPTION

[0024] The present invention will be described more clearly and completely below by way of embodiments in conjunction with the accompanying drawings.

[0025] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the structures shown in the accompanying drawings are only schematic and do not constitute any limitation to the present invention.

[0026] Figure 1 FIG. 1 is a schematic diagram of the structure of a compressed air and steam cogeneration device according to an embodiment of the present invention. Figure 1 As shown, the compressed air and steam co-generation device involved in this embodiment includes: an air compressor body 2; an oil-gas cylinder 3, which is connected to the air compressor body 2; a lubricating oil circulation path, which is connected to the air compressor body 2 and the oil-gas cylinder 3 in sequence; an evaporator 5, which is connected to the lubricating oil circulation path; a refrigerant circulation path, which is connected to the evaporator 5; a condenser 11, which is connected to the refrigerant circulation path; and a steam forming path, which is connected to the condenser 11; wherein the lubricating oil of the air compressor body 2 enters the lubricating oil circulation path, the lubricating oil on the lubricating oil circulation path and the refrigerant on the refrigerant circulation path perform heat exchange with each other in the evaporator 5, and the refrigerant on the refrigerant circulation path and the water on the steam forming path perform heat exchange with each other in the condenser 11 to form steam.

[0027] The refrigerant circulation path includes a variable frequency compressor 10. The lubricating oil circulation path also includes: a temperature sensor 6, a temperature control valve 7, whose inlet is connected to the outlet of the evaporator 5, whose first outlet is connected to the inlet of the air-cooled / water-cooled heat exchanger 8, and whose second outlet is connected to the outlet of the air-cooled / water-cooled heat exchanger 8; the air-cooled / water-cooled heat exchanger 8. The temperature control valve 7 controls the flow of lubricating oil flowing through the air-cooled / water-cooled heat exchanger 8 according to the detection result of the temperature sensor 6.

[0028] The lubricating oil circulation path also includes: an oil filter 9 located after the air-cooling / water-cooling heat exchanger 8 .

[0029] The steam forming path includes: a vapor-liquid separator 13 communicating with the condenser 11 and a pump 14 , wherein the pump 14 is connected between the vapor-liquid separator 13 and the condenser 11 .

[0030] When the variable frequency compressor 10 stops running, the temperature control valve 7 controls the flow of lubricating oil flowing through the air-cooled / water-cooled heat exchanger 8 according to the lubricating oil temperature detected by the temperature sensor 6. When the lubricating oil temperature is lower than or equal to the target temperature, the temperature control valve 7 prevents the lubricating oil from flowing through the air-cooled / water-cooled heat exchanger 8; when the lubricating oil temperature is higher than the target temperature, the temperature control valve 7 controls a part of the lubricating oil to flow through the air-cooled / water-cooled heat exchanger 8.

[0031] The refrigerant circulation path further includes: a throttling device 12 located between the condenser 11 and the evaporator 5 .

[0032] The variable frequency compressor 10 adjusts its operating frequency according to the lubricating oil temperature detected by the temperature sensor 6. When the lubricating oil temperature is lower than the target temperature, the variable frequency compressor 10 reduces the operating frequency to reduce the heat exchange in the evaporator 5; when the lubricating oil temperature is higher than the target temperature, the variable frequency compressor 10 increases the operating frequency to increase the heat exchange in the evaporator 5.

[0033] There is also an air filter 1 which is communicated with the air compressor body 2.

[0034] In the lubricating oil circulation path, the oil cylinder 3 is located between the air compressor body 2 and the evaporator 5 , and the temperature control valve 7 is located between the evaporator 5 and the oil filter 9 .

[0035] Specifically, the compressed air and steam cogeneration device provided in this embodiment mainly consists of the following parts:

[0036] Air compression system: includes air filter 1, air compressor body 2 and oil-gas cylinder 3. The outside air is first filtered by air filter 1 and then enters air compressor body 2. Air compressor body 2 adopts a screw compressor, for example, and is provided with a male rotor and a female rotor meshing with each other. The gaps between the rotors and between the rotors and the housing are extremely small. The air is compressed into high-temperature and high-pressure gas through the high-speed rotation of the rotors. The compressed high-temperature and high-pressure gas is mixed with lubricating oil and enters oil-gas cylinder 3. Oil-gas cylinder 3 adopts a cyclone separation structure, for example, and uses centrifugal force to separate the lubricating oil from the oil-gas mixture. The separated compressed air is cooled by air-cooled / water-cooled heat exchanger 4 and then output from compressed air outlet b.

[0037] Lubricating oil circulation path: includes oil and gas cylinder 3, evaporator 5, temperature sensor 6, temperature control valve 7, air-cooled / water-cooled heat exchanger 8 and oil filter 9. The lubricating oil separated from the oil and gas cylinder 3 enters the evaporator 5, exchanges heat with the refrigerant, and reduces the temperature. The temperature sensor 6 is, for example, a Pt100 thermistor, installed at the outlet of the evaporator 5, and is used to monitor the temperature of the lubricating oil in real time. The temperature control valve 7 is a three-way valve, whose inlet is connected to the outlet of the evaporator 5, the first outlet is connected to the inlet of the air-cooled / water-cooled heat exchanger 8, and the second outlet is connected to the outlet of the air-cooled / water-cooled heat exchanger 8. The temperature control valve 7 controls the flow of lubricating oil flowing through the air-cooled / water-cooled heat exchanger 8 according to the detection result of the temperature sensor 6, thereby accurately controlling the temperature of the lubricating oil. The air-cooled / water-cooled heat exchanger 8 is, for example, a plate heat exchanger, which is provided with a plurality of parallel heat exchange plates, and the lubricating oil and the cooling medium (air or water) flow between adjacent plates respectively to exchange heat. The lubricating oil after passing through the temperature control valve 7 and the air-cooling / water-cooling heat exchanger 8 is finally filtered through the oil filter 9 and returned to the air compressor body 2. The oil filter 9 is, for example, a bag filter, which can effectively remove impurities in the lubricating oil and ensure the cleanliness of the lubricating oil.

[0038] Refrigerant circulation path: includes evaporator 5, variable frequency compressor 10, condenser 11 and throttling device 12. After absorbing heat from the lubricating oil in the evaporator 5, the refrigerant evaporates into gaseous state and then enters the variable frequency compressor 10. The variable frequency compressor 10, for example, adopts a scroll compressor, and its operating frequency can be adjusted according to the lubricating oil temperature detected by the temperature sensor 6, so as to control the heat exchange amount in the evaporator 5 and realize accurate control of the lubricating oil temperature. The variable frequency compressor 10 compresses the refrigerant into high-temperature and high-pressure gas and then sends it to the condenser 11. The condenser 11 adopts a shell and tube heat exchanger, for example, in which the refrigerant flows on the shell side and the water flows on the tube side, and the two exchange heat. The refrigerant transfers heat to the water in the condenser 11 and condenses into liquid state, and then enters the evaporator 5 again after throttling and reducing the pressure through the throttling device 12, completing a cycle. The throttling device 12 adopts an electronic expansion valve, for example, which can accurately control the flow rate of the refrigerant.

[0039] Steam formation path: includes condenser 11, pump 14 and vapor-liquid separator 13. Water is sent into the tube side of condenser 11 by pump 14, and its temperature rises after absorbing heat from refrigerant. The heated water enters vapor-liquid separator 13. Vapor-liquid separator 13 adopts a gravity separation structure, for example, to separate steam and water by the density difference between the two. When the water temperature reaches the target temperature, steam will be generated by continuing to absorb heat. The generated steam is output from steam outlet c. The pressure inside vapor-liquid separator 13 can be adjusted by a pressure control device to control the temperature and pressure of steam. Vapor-liquid separator 13 is also provided with a water replenishment port d, which is used to replenish desalted water or softened water to ensure water quality and reduce the generation of scale.

[0040] In this embodiment, the target temperature of the lubricating oil is set to 60-70°C, and the target temperature of the steam is set to 100-150°C.

[0041] The working process of the device of the present invention is as follows:

[0042] First, air enters from the air inlet a, passes through the air filter 1, and then enters the air compressor body 2, where it is compressed into high-temperature and high-pressure gas. The compressed high-temperature and high-pressure gas is mixed with the lubricating oil and then enters the oil-gas cylinder 3 to separate the lubricating oil. The separated compressed air is cooled by the air-cooled / water-cooled heat exchanger 4 and then output from the compressed air outlet b.

[0043] The high-temperature lubricating oil separated from the oil-gas cylinder 3 enters the lubricating oil circulation path. The lubricating oil exchanges heat with the refrigerant in the evaporator 5 to reduce the temperature. The temperature sensor 6 monitors the temperature of the lubricating oil in real time and transmits the signal to the temperature control valve 7 and the variable frequency compressor 10. The temperature control valve 7 controls the flow of lubricating oil flowing through the air-cooled / water-cooled heat exchanger 8 according to the temperature of the lubricating oil, and accurately controls the temperature of the lubricating oil. When steam preparation is not required, that is, the variable frequency compressor 10 stops running, if the lubricating oil temperature is lower than the target temperature, the temperature control valve 7 will completely prevent the lubricating oil from flowing through the air-cooled / water-cooled heat exchanger 8; if the lubricating oil temperature is higher than the target temperature, the temperature control valve 7 will control a part of the lubricating oil to flow through the air-cooled / water-cooled heat exchanger 8 for cooling. The lubricating oil is filtered through the oil filter 9 and then returned to the air compressor body 2.

[0044] The refrigerant circulates in the refrigerant circulation path. After absorbing the heat of the lubricating oil in the evaporator 5, the refrigerant evaporates into a gaseous state and then enters the variable frequency compressor 10. The variable frequency compressor 10 adjusts its operating frequency according to the temperature of the lubricating oil to control the heat exchange in the evaporator 5. The compressed refrigerant enters the condenser 11, transfers the heat to the water and condenses into a liquid state, and then enters the evaporator 5 again after throttling and reducing the pressure through the throttling device 12. The working medium is in a liquid state before entering the throttling device 12. After entering the throttling device 12, it is throttled and discharged into a gas-liquid two-phase state. After that, it enters the evaporator 5 to absorb the heat of the lubricating oil from the oil and gas cylinder 3 and evaporates into a gaseous state. The gaseous working medium enters the variable frequency compressor 10 again and is compressed to a high-temperature and high-pressure gaseous state and then discharged. Finally, it enters the condenser 11 to exchange heat with water, cools down and condenses into a liquid state, and enters the throttling device 12 again for throttling, thereby forming a cycle, thereby transferring the heat of the lubricating oil in the evaporator 5 to the water in the condenser 11.

[0045] Water circulates in the steam formation path. Water is pumped into the condenser 11 by the pump 14, and after absorbing heat from the refrigerant, the temperature rises and enters the vapor-liquid separator 13. When the water temperature reaches the target temperature, it continues to absorb heat to generate steam, which is output from the steam outlet c. The pressure of the vapor-liquid separator 13 can be adjusted by a pressure control device to control the temperature and pressure of the steam. The vapor-liquid separator 13 is also provided with a water replenishment port d for replenishing demineralized water or softened water.

[0046] The high-temperature lubricating oil separated from the oil-gas cylinder 3 first enters the evaporator 5, exchanges heat with the working medium coming out of the throttling device 12 for cooling, and then is discharged from the evaporator 5 and enters the temperature control valve 7 for flow distribution. One part passes through the air-cooled / water-cooled heat exchanger 8, and the other part does not pass through the air-cooled / water-cooled heat exchanger 8. Finally, the two parallel lubricating oil branches are merged, and the lubricating oils of the two are mixed and returned to the air compressor body 2.

[0047] By means of the variable frequency operation of the variable frequency compressor 10, the heat exchange amount in the evaporator 5 is adjusted to realize the control of the temperature at the temperature sensor 6. When the temperature of the temperature sensor 6 is lower than the target oil supply temperature of the air compressor body 2, the variable frequency compressor 10 reduces the frequency to reduce the heat exchange amount in the evaporator 5, so that the oil temperature at the temperature sensor 6 is increased to the target oil supply temperature; when the temperature of the temperature sensor 6 is higher than the target oil supply temperature of the air compressor body 2, the variable frequency compressor 10 increases the frequency to increase the heat exchange amount in the evaporator 5, so that the oil temperature at the temperature sensor 6 is decreased to the target oil supply temperature.

[0048] When it is not necessary to prepare steam, the variable frequency compressor 10 stops running, and the evaporator 5 does not cool the lubricating oil at this time, and the oil temperature of the device can be controlled by the temperature control valve 7. When the temperature of the temperature sensor 6 is less than or equal to the target oil supply temperature of the air compressor body 2, the temperature control valve 7 controls the lubricating oil not to flow through the air cooling / water cooling heat exchanger 8, but directly enters the oil filter 9, and enters the air compressor body 2 after filtering; when the temperature of the temperature sensor 6 is greater than the target oil supply temperature of the air compressor body 2, the temperature control valve 7 controls a part of the lubricating oil to enter the air cooling / water cooling heat exchanger 8 to exchange heat with air or water for cooling, and the other part is directly mixed with the lubricating oil at the outlet of the air cooling / water cooling heat exchanger 8, so that the temperature of the mixed lubricating oil is equal to or close to the target oil supply temperature of the air compressor body 2, and then the lubricating oil is filtered through the oil filter 9 and enters the air compressor body 2.

[0049] The present invention realizes the co-production of compressed air and steam through the above structure and working process, improves energy utilization efficiency, reduces operating costs, and reduces the area occupied by equipment.

Claims

1. A compressed air and steam co-generation device, characterized in that: include: Air compressor body (2); An oil-gas cylinder (3), connected to the air compressor body (2), and used for separating compressed air and lubricating oil; A lubricating oil circulation path is sequentially connected to the air compressor body (2) and the oil and gas cylinder (3); an evaporator (5), connected to the lubricating oil circulation path; A refrigerant circulation path, connected to the evaporator (5); A condenser (11) connected to the refrigerant circulation path; a steam forming path, communicating with the condenser (11); The lubricating oil of the air compressor body (2) enters the lubricating oil circulation path, the lubricating oil on the lubricating oil circulation path and the refrigerant on the refrigerant circulation path perform heat exchange in the evaporator (5), and the refrigerant on the refrigerant circulation path and the water on the steam forming path perform heat exchange in the condenser (11) to form steam.

2. The compressed air and steam co-generation device according to claim 1, characterized in that: The refrigerant circulation path includes a variable frequency compressor (10).

3. The compressed air and steam co-generation device according to claim 2, characterized in that: The lubricating oil circulation path also includes: a temperature sensor (6) for detecting the temperature of the lubricating oil; a temperature control valve (7), an inlet of which is connected to the outlet of the evaporator (5), a first outlet of which is connected to the inlet of the air-cooling / water-cooling heat exchanger (8), and a second outlet of which is connected to the outlet of the air-cooling / water-cooling heat exchanger (8), and the temperature control valve (7) controls the flow rate of the lubricating oil flowing through the air-cooling / water-cooling heat exchanger (8) according to the detection result of the temperature sensor (6).

4. The compressed air and steam co-generation device according to claim 3, characterized in that: The lubricating oil circulation path also includes: an oil filter (9) located after the air-cooling / water-cooling heat exchanger (8) and used for filtering the lubricating oil.

5. The compressed air and steam co-generation device according to claim 4, characterized in that: The steam forming path comprises: a vapor-liquid separator (13) and a pump (14) which are in communication with the condenser (11); the pump (14) is connected between the vapor-liquid separator (13) and the condenser (11).

6. The compressed air and steam co-generation device according to claim 5, characterized in that: When the variable frequency compressor (10) stops running, the temperature control valve (7) controls the flow rate of the lubricating oil flowing through the air-cooling / water-cooling heat exchanger (8) according to the lubricating oil temperature detected by the temperature sensor (6); when the lubricating oil temperature is lower than or equal to a target temperature, the temperature control valve (7) prevents the lubricating oil from flowing through the air-cooling / water-cooling heat exchanger (8); when the lubricating oil temperature is higher than the target temperature, the temperature control valve (7) controls a portion of the lubricating oil to flow through the air-cooling / water-cooling heat exchanger (8).

7. The compressed air and steam co-generation device according to claim 2, characterized in that: The refrigerant circulation path also includes a throttling device (12) located between the condenser (11) and the evaporator (5).

8. The compressed air and steam co-generation device according to claim 7, characterized in that: The variable frequency compressor (10) adjusts its operating frequency according to the lubricating oil temperature detected by the temperature sensor (6); when the lubricating oil temperature is lower than a target temperature, the variable frequency compressor (10) lowers its operating frequency to reduce the heat exchange amount in the evaporator (5); when the lubricating oil temperature is higher than the target temperature, the variable frequency compressor (10) increases its operating frequency to increase the heat exchange amount in the evaporator (5).

9. The compressed air and steam co-generation device according to claim 1, characterized in that: Also includes: An air filter (1) is connected to the air compressor body (2) and is used for filtering the air entering the air compressor body (2).

10. The compressed air and steam co-generation device according to claim 4, characterized in that: In the lubricating oil circulation path, the oil cylinder (3) is located between the air compressor body (2) and the evaporator (5), and the temperature control valve (7) is located between the evaporator (5) and the oil filter (9).

Images