A compressed air purification system

Abstract

The application discloses a compressed air purification system, comprising a compressed air inlet, a first control valve, a filtering device, a second control valve, a compressed air outlet, an air storage tank, a third control valve, a fourth control valve, a fifth control valve, a cleaning air outlet and a control unit. The filtering device is used to realize the purification function of compressed air, the air storage tank is used to store part of compressed air to realize the self-cleaning function of the filtering device, and the control unit controls the opening and closing states of the first control valve, the second control valve, the third control valve, the fourth control valve and the fifth control valve. The application realizes the compressed air purification function and the system self-cleaning function, reduces the manual maintenance frequency, reduces the on-site cleaning and filter screen replacement work and cost, and improves the use convenience and service life of the compressed air purification system.

Description

Technical Field

[0001] This invention relates to the field of compressed air energy storage and power generation technology, and in particular to a compressed air purification system. Background Technology

[0002] Against the backdrop of global efforts to address climate change, my country has clearly proposed a dual-carbon strategic goal of "peaking carbon by 2030 and achieving carbon neutrality by 2060," making energy structure transformation an inevitable trend. The installed capacity of new energy power generation, represented by wind power and photovoltaics, continues to expand, gradually becoming the main energy source for the new power system. However, wind power, photovoltaics, and other new energy power generation methods have significant randomness, intermittency, and volatility, and their large-scale grid connection poses a severe challenge to the safe and stable operation of the power system. To mitigate fluctuations in new energy output, enhance grid regulation capabilities, and ensure power supply reliability, energy storage technology is considered a key component supporting the construction of the new power system. Among numerous energy storage technologies, salt cavern compressed air energy storage, with its advantages of low cost, large scale, high efficiency, and good adaptability to geographical resources, has been rapidly demonstrated and promoted in China in recent years, showcasing broad application prospects.

[0003] Salt cavern compressed air energy storage systems utilize artificial cavities formed by the leaching of underground salt rock layers as storage containers. During the energy storage phase, an electric motor drives a compressor to compress air and inject it into the salt cavern for storage. During the energy release phase, the high-pressure air is released to drive a turbine for power generation. However, as natural or artificially modified underground gas storage spaces, salt caverns are in long-term contact with groundwater, salt layers, and rock matrix. During the gas storage process, phenomena such as particulate matter shedding, salt precipitation, and moisture condensation can easily occur. When the system enters the energy release phase, the high-pressure air drawn from the salt cavern often carries a large amount of solid impurities and chemical pollutants, mainly including rock fragments, salt particles, chlorides, halides, and liquid water or high-humidity air. These impurities, after entering the surface process system with the high-speed airflow, can cause various forms of damage to critical equipment such as heat exchangers, turbine blades, and pipe valves, including erosion, corrosion, scaling, and blockage, severely reducing equipment efficiency and service life, and even causing safety accidents. Currently, conventional air filtration devices such as filter cartridges, filter bags, or cyclone separators can intercept larger particles to some extent, but they are ineffective at removing micron-sized dust, soluble salt spray, and halides, and their separation effect on high-humidity, salt-containing vapors is limited. Furthermore, due to the complex composition and strong adhesion of impurities, filter screens or cartridges are easily clogged, and frequent on-site disassembly and replacement not only significantly increases maintenance costs but also affects the continuous and stable operation of the system. Summary of the Invention

[0004] This invention provides a compressed air purification system that realizes compressed air purification and system self-cleaning functions, reduces the frequency of manual maintenance, reduces on-site cleaning and filter replacement work and costs, and improves the ease of use and service life of the compressed air purification system.

[0005] The present invention provides a compressed air purification system, including a compressed air inlet, a first control valve, a filter device, a second control valve, a compressed air outlet, an air storage tank, a third control valve, a fourth control valve, a fifth control valve, a cleaning air outlet, and a control unit. The filtration device includes a first filter inlet, a first filter outlet, a first cleaning inlet, and a first cleaning outlet; the first filter inlet is connected to the second end of the first control valve, the first end of the first control valve is connected to the compressed air inlet, the first filter outlet is connected to the first end of the second control valve, and the second end of the second control valve is connected to the compressed air outlet. The air storage tank includes an air storage port; the air storage port is connected to the second end of the third control valve and the second end of the fourth control valve respectively; the first end of the third control valve is connected to the first end of the second control valve; the first end of the fourth control valve is connected to the first cleaning air inlet. The first cleaning air outlet is connected to the second end of the fifth control valve, and the first end of the fifth control valve is connected to the cleaning air outlet. The control unit is connected to the first control valve, the second control valve, the third control valve, the fourth control valve, and the fifth control valve, respectively. The control unit is configured to, upon receiving a start purification command, control both the first and second control valves to be in the open state, and control both the fourth and fifth control valves to be in the closed state, so that the filter device can purify the compressed air; it is also configured to, upon receiving a stop purification command, control both the first and second control valves to be in the closed state, and control both the fourth and fifth control valves to be in the open state, so that the compressed air in the air tank can clean the filter device.

[0006] Optionally, it also includes a first pressure detection device; The first pressure detection device is connected to the air storage port and is used to detect the pressure inside the air storage tank and obtain a first pressure value; The control unit is connected to the first pressure detection device and is used to control the third control valve to be in the open state when it receives the start purification command and the first pressure value is less than the preset pressure threshold.

[0007] Optionally, the filtration device includes a first filter, a separator, and a sixth control valve; The first filter includes a first filter inlet, a first cleaning inlet, and a first cleaning outlet; the separator includes a first separation inlet, a first impurity outlet, and the first filter outlet. The first cleaning air inlet is connected to the first end of the sixth control valve, and the second end of the sixth control valve is connected to the first separation air inlet; The control unit is connected to the sixth control valve and is used to control the sixth control valve to be in the open state when the purification start command is received, so that the first filter and the separator can purify the compressed air.

[0008] Optionally, the separator is a combined cyclone separator, which includes a lower cyclone separation unit and an upper cleaning unit; the compressed air purification system also includes a main cleaning water inlet and a seventh control valve. The lower cyclone separator unit includes the first separation air inlet and the first impurity outlet; the upper cleaning unit includes the first cleaning water inlet, the first cleaning water outlet and the first filter air outlet; the first cleaning water inlet is connected to the second end of the seventh control valve, and the first end of the seventh control valve is connected to the main cleaning water inlet; the upper cleaning unit is connected to the lower cyclone separator unit. The control unit is connected to the seventh control valve and is used to control the seventh control valve to be in the open state when the purification start command is received, so that cleaning water enters the combined cyclone separator and the combined cyclone separator purifies the compressed air.

[0009] Optionally, it also includes a heat exchanger, a heating water inlet, a heating water outlet, and an eighth control valve; The heat exchanger includes a heat exchange air inlet, a heat exchange air outlet, a heat exchange hot water inlet, and a heat exchange hot water outlet; the heat exchange air inlet is connected to the second end of the eighth control valve, the first end of the eighth control valve is connected to the first filter outlet, and the heat exchange air outlet is connected to the first end of the second control valve. The heating water inlet is connected to the hot water exchange inlet; the heating water outlet is connected to the hot water exchange outlet. The control unit is connected to the eighth control valve and is used to control the eighth control valve to be in the open state when the purification start command is received, so that the heat exchanger removes water mist from the compressed air.

[0010] Optionally, it also includes an auxiliary electric heating device and a temperature detection device; The two ends of the auxiliary electric heating device are respectively connected to the heating water inlet and the hot water exchange inlet; The temperature detection device is connected to the heating water inlet and is used to detect the temperature of the heating water inlet to obtain the heating water temperature value; The control unit is connected to the auxiliary electric heating device and the temperature detection device respectively, and is used to control the auxiliary electric heating device to turn on when the heating water temperature is less than a preset temperature threshold.

[0011] Optionally, it also includes a ninth control valve, a tenth control valve, a second cleaning water outlet, and a main cleaning water inlet; The first end of the ninth control valve is connected to the main inlet of the cleaning water, and the second end of the ninth control valve is connected to the outlet of the heat exchange air. The first end of the tenth control valve is connected to the heat exchange air inlet, and the second end of the tenth control valve is connected to the second cleaning water outlet. The control unit is connected to the ninth control valve and the tenth control valve respectively. When the control unit receives the stop purification command, in the first stage, it controls the ninth control valve and the tenth control valve to be in the open state, and controls the third control valve to be in the closed state, so that cleaning water enters the heat exchanger to clean the heat exchanger.

[0012] Optionally, the control unit is further configured to, upon receiving the stop purification command, in the second stage, control the ninth control valve to be in a closed state, and control the third control valve and the tenth control valve to be in an open state, so that the compressed air in the air tank dries the heat exchanger; The second stage follows the first stage.

[0013] Optionally, the filtration device further includes a second filter and a twelfth control valve; the compressed air purification system further includes an eleventh control valve, a second pressure detection device, a third pressure detection device, a fourth pressure detection device, and a fifth pressure detection device. The second filter includes a second filter inlet and a second cleaning inlet; the second filter inlet is connected to the second end of the eleventh control valve, and the first end of the eleventh control valve is connected to the compressed air inlet; the second cleaning inlet is connected to the first end of the twelfth control valve; and the second end of the twelfth control valve is connected to the first separation inlet. The second pressure detection device is connected to the first filter inlet and is used to detect the pressure of the first filter inlet and obtain a second pressure value; the third pressure detection device is connected to the first cleaning inlet and is used to detect the pressure of the first cleaning inlet and obtain a third pressure value; the fourth pressure detection device is connected to the second filter inlet and is used to detect the pressure of the second filter inlet and obtain a fourth pressure value; the fifth pressure detection device is connected to the second cleaning inlet and is used to detect the pressure of the second cleaning inlet and obtain a fifth pressure value. The air control unit is connected to the second pressure detection device, the third pressure detection device, the fourth pressure detection device, the fifth pressure detection device, the eleventh control valve, and the twelfth control valve, respectively. The control unit is used to control the first control valve and the sixth control valve to be in a closed state and to control the eleventh control valve and the twelfth control valve to be in an open state when it receives the start purification command and the difference between the second air pressure value and the third air pressure value is greater than a preset differential pressure threshold, so that the second filter can purify the compressed air. The control unit is further configured to, upon receiving the start purification command and when the difference between the fourth pressure value and the fifth pressure value of the air is greater than the preset differential pressure threshold, control the first control valve and the sixth control valve to be in the open state, and control the eleventh control valve and the twelfth control valve to be in the closed state, so that the first filter can purify the compressed air.

[0014] Optionally, it also includes a thirteenth control valve, a fourteenth control valve, and a fifteenth control valve; The first end of the thirteenth control valve is connected to the first cleaning air inlet; the second end of the thirteenth control valve is connected to the first end of the fourth control valve; the first end of the fourteenth control valve is connected to the first end of the fourth control valve, and the second end of the fourteenth control valve is connected to the second cleaning air inlet. The second filter further includes a second cleaning air outlet; the second end of the fifteenth control valve is connected to the second cleaning air outlet, and the first end of the fifteenth control valve is connected to the cleaning air outlet; The control unit is connected to the thirteenth control valve, the fourteenth control valve, and the fifteenth control valve, respectively. The control unit is used to control the fourth control valve, the thirteenth control valve, and the fifth control valve to be in an open state, and to control the fourteenth control valve and the fifteenth control valve to be in a closed state when the difference between the second pressure value and the third pressure value of the air is greater than the preset differential pressure threshold, so that the compressed air in the air storage tank cleans the first filter; The control unit is also configured to, when the difference between the fourth pressure value and the fifth pressure value of the air is greater than the preset differential pressure threshold, control the fourth control valve, the fourteenth control valve and the fifteenth control valve to be in the open state, and control the thirteenth control valve and the fifth control valve to be in the closed state, so that the compressed air in the air storage tank cleans the second filter.

[0015] The compressed air purification system provided by this invention incorporates a filter device and an air storage tank. When the control unit receives a start purification command, it controls the compressed air to flow through the filter device before entering the compressed air energy release system. This achieves filtration of the compressed air, preventing impurities in the compressed air from damaging the heat exchanger and turbine in the compressed air energy release system, thus extending the service life and maintenance cycle of the heat exchanger and turbine. Simultaneously, part of the filtered compressed air is stored in the air storage tank. When the control unit receives a stop purification command, it controls the compressed air to flow from the air storage tank through the filter device and then exit the compressed air purification system. This achieves a self-cleaning function for the filter device, reducing the frequency of manual maintenance, minimizing on-site cleaning and filter replacement work and costs, and improving the ease of use and service life of the compressed air purification system.

[0016] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of a compressed air purification system provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of another compressed air purification system provided in an embodiment of the present invention; Figure 3This is a schematic diagram of the structure of another compressed air purification system provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of another compressed air purification system provided in an embodiment of the present invention; Figure 5 This is a schematic diagram of the structure of another compressed air purification system provided in an embodiment of the present invention; Figure 6 This is a schematic diagram of another compressed air purification system provided in an embodiment of the present invention. Detailed Implementation

[0019] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0020] The terminology used in the embodiments of this invention is for the purpose of describing specific embodiments only and is not intended to limit the invention. It should be noted that directional terms such as "upper," "lower," "left," and "right" described in the embodiments of this invention are used to describe the angles shown in the accompanying drawings and should not be construed as limiting the embodiments of this invention. Furthermore, in the context, it should be understood that when referring to an element being formed "on" or "below" another element, it can be formed not only directly on or below the other element, but also indirectly on or below it through intermediate elements. The terms "first," "second," etc., are used for descriptive purposes only and do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0021] The term "comprising" and its variations as used in this invention are open-ended, meaning "including but not limited to". The term "based on" means "at least partially based on". The term "one embodiment" means "at least one embodiment".

[0022] It should be noted that the concepts of "first" and "second" mentioned in this invention are only used to distinguish the corresponding contents and are not used to limit the order or interdependence.

[0023] It should be noted that the terms "a" and "a plurality of" used in this invention are illustrative rather than restrictive. Those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0024] Figure 1 This is a schematic diagram of a compressed air purification system provided in an embodiment of the present invention, as shown below. Figure 1 As shown, the compressed air purification system includes a compressed air inlet 101, a first control valve 1, a filter device 201, a second control valve 2, a compressed air outlet 102, an air storage tank 202, a third control valve 3, a fourth control valve 4, a fifth control valve 5, a cleaning air outlet 103, and a control unit (not shown in the figure). The filter device 201 includes a first filter inlet 2011, a first filter outlet 2012, a first cleaning air inlet 2013, and a first cleaning air outlet 2014. The first filter inlet 2011 is connected to the second end of the first control valve 1, the first end of the first control valve 1 is connected to the compressed air inlet 101, the first filter outlet 2012 is connected to the first end of the second control valve 2, and the second end of the second control valve 2 is connected to the compressed air outlet 102. Air storage tank 202 includes an air storage port 2021, which is connected to the second end of the third control valve 3 and the second end of the fourth control valve 4. The first end of the third control valve 3 is connected to the first end of the second control valve 2, and the first end of the fourth control valve 4 is connected to the first cleaning air inlet 2013. The first cleaning air outlet 2014 is connected to the second end of the fifth control valve 5, and the first end of the fifth control valve 5 is connected to the cleaning air outlet 103. The control unit is connected to the first control valve 1, the second control valve 2, the third control valve 3, the fourth control valve 4, and the fifth control valve 5. The control unit is used to control the first control valve 1 and the second control valve 2 to be in the open state and the fourth control valve 4 and the fifth control valve 5 to be in the closed state when a purification start command is received, so that the filter device 201 can purify the compressed air. It is also used to control the first control valve 1 and the second control valve 2 to be in the closed state and the fourth control valve 4 and the fifth control valve 5 to be in the open state when a purification stop command is received, so that the compressed air in the air storage tank 202 can clean the filter device 201.

[0025] Because compressed air stored in underground salt caverns carries a large amount of complex impurities such as rock fragments, salt particles, chlorides, and high-humidity water vapor, it is necessary to filter the compressed air before using it for energy release to ensure that the compressed air entering the energy release system is clean. Figure 1As shown, the compressed air inlet 101 can be connected to the salt cavern. When the control unit receives the start purification command, the control unit controls the first control valve 1 and the second control valve 2 to be in the open state, and controls the fourth control valve 4 and the fifth control valve 5 to be in the closed state. At this time, compressed air is input into the filter device 201 through the compressed air inlet 101. The filter device 201 filters out a large number of impurities such as rock chips and salt particles carried by the compressed air. Then, the compressed air is output to the compressed air energy release system through the compressed air outlet 102. Since the impurities in the compressed air have been filtered out, the damage caused by the impurities in the compressed air to the heat exchanger and turbine in the compressed air energy release system is avoided.

[0026] Further, refer to Figure 1 The compressed air purification system also includes an air storage tank 202. When the control unit receives a purification start command, it can also control the third control valve 3 to open. At this time, part of the compressed air that has passed through the filter device 201 is output to the compressed air release system through the compressed air outlet 102, and the other part is stored in the air storage tank 202. It is understood that when the compressed air stored in the air storage tank 202 reaches a set value, the control unit can control the third control valve 3 to close to ensure that the use of compressed air by the compressed air release system is not affected.

[0027] Since impurities carried by the compressed air are adsorbed onto the filter screen of the filter device 201 when filtering compressed air, in order to reduce the frequency of manual maintenance of the filter device 201, when the control unit receives a stop purification command, it can control both the first control valve 1 and the second control valve 2 to be closed, and control both the fourth control valve 4 and the fifth control valve 5 to be open. (Refer to...) Figure 1 At this time, the compressed air stored in the air tank 202 will enter the filter device 201 through the first cleaning air inlet 2013. In the filter device 201, the compressed air will blow the impurities adsorbed on the filter screen toward the first cleaning air outlet 2014, and finally discharge the compressed air purification system through the cleaning air outlet 103. Thus, the purpose of self-cleaning of the filter device 201 is achieved.

[0028] This invention, through the installation of a filter device and an air storage tank in the compressed air purification system, allows the compressed air to flow through the filter device before entering the compressed air energy release system upon receiving a purification start command. This achieves air filtration, preventing impurities in the compressed air from damaging the heat exchanger and turbine in the compressed air energy release system, thus extending their service life and maintenance cycle. Simultaneously, the filtered compressed air is partially stored in the air storage tank. Upon receiving a purification stop command, the compressed air flows from the air storage tank through the filter device and is then discharged from the compressed air purification system. This achieves a self-cleaning function for the filter device, reducing the frequency of manual maintenance, minimizing on-site cleaning and filter replacement work and costs, and improving the ease of use and service life of the compressed air purification system.

[0029] Optionally, continue to refer to Figure 1 The compressed air purification system also includes a first pressure detection device 203. The first pressure detection device 203 is connected to the air storage port 2021 and is used to detect the pressure inside the air storage tank 202 and obtain a first pressure value. The control unit is connected to the first pressure detection device 203 and is used to control the third control valve 3 to be in the open state when a purification start command is received and the first pressure value is less than a preset pressure threshold.

[0030] When the control unit receives the start purification command, to prevent excessive compressed air storage in the air tank 202 from affecting the compressed air release system's use of compressed air, the first pressure detection device 203 can detect the pressure inside the air tank 202 and obtain a first pressure value. Only when the first pressure value is less than a preset pressure threshold indicates that the air tank 202 contains only a small amount of compressed air, which cannot be used to clean the filter device 201. At this time, the control unit can control the third control valve 3 to be in the open state, allowing the compressed air filtered by the filter device 201 to enter the air tank 202. Furthermore, when the first pressure value in the air tank 202 detected by the first pressure detection device 203 is greater than or equal to the preset pressure threshold, it indicates that the air tank 202 has sufficient compressed air. At this time, the control unit can control the third control valve 3 to be in the closed state, so that all the filtered compressed air is input into the compressed air release system.

[0031] Optionally, Figure 2 This is a schematic diagram of another compressed air purification system provided in an embodiment of the present invention, as shown below. Figure 2As shown, the filtration device includes a first filter 204, a separator 205, and a sixth control valve 6. The first filter 204 includes a first filter inlet 2011, a first cleaning inlet 2013, and a first cleaning outlet 2014. The separator 205 includes a first separation inlet 2051, a first impurity outlet 2052, and a first filter outlet 2012. The first cleaning inlet 2013 is connected to a first end of the sixth control valve 6, and the second end of the sixth control valve 6 is connected to the first separation inlet 2051. A control unit is connected to the sixth control valve 6 and, upon receiving a start purification command, controls the sixth control valve 6 to be in an open state, so that the first filter 204 and the separator 205 can purify the compressed air.

[0032] To achieve optimal purification by filtering out different impurities in compressed air, such as... Figure 2 As shown, the filtration device includes a first filter 204, a separator 205, and a sixth control valve 6. When the control unit receives the start purification command, it controls the sixth control valve 6 to be in the open state. At this time, compressed air is output from the compressed air inlet 101 through the first filter 204 and the separator 205 to the compressed air outlet 102, thereby realizing the purification of compressed air.

[0033] Specifically, the first filter 204 can be a basket filter, capable of filtering out large solid particles of 5 mm or larger from the compressed air and adsorbing the impurities onto the filter screen. For example, the first filter 204 can be made of carbon steel. The separator 205 can filter out medium-sized solid particles and liquid water from the compressed air, and discharges the separated solid impurities and liquid water from the first impurity discharge port 2052. (Reference) Figure 2 The compressed air purification system also includes a solid-liquid impurity outlet 104 and a sixteenth control valve 16. A first impurity outlet 2052 is connected to the second end of the sixteenth control valve 16, and the first end of the sixteenth control valve 16 is connected to the solid-liquid impurity outlet 104. Simultaneously, the control unit is also connected to the sixteenth control valve 16. When the control unit receives a purification start command, it controls the sixteenth control valve 16 to be open, allowing impurities separated by the separator 205 to be discharged from the compressed air purification system through the solid-liquid impurity outlet 104.

[0034] It should be noted that when the control unit receives a stop purification command, the control unit will control the first control valve 1, the second control valve 2, the sixth control valve 6, and the sixteenth control valve 16 to be closed, and control the fourth control valve 4 and the fifth control valve 5 to be open. This allows the compressed air in the air tank 202 to enter the first filter 204 through the first cleaning inlet 2013. In the first filter 204, the compressed air will blow the impurities adsorbed on the filter screen toward the first cleaning outlet 2014, and finally discharge the compressed air purification system through the cleaning air outlet 103. This achieves the purpose of cleaning the first filter 204 with the compressed air in the air tank.

[0035] In an alternative embodiment, Figure 3 This is a schematic diagram of another compressed air purification system provided in an embodiment of the present invention, as shown below. Figure 3 As shown, separator 205 is a combined cyclone separator, which includes a lower cyclone separation unit 205a and an upper cleaning unit 205b. The compressed air purification system also includes a cleaning water main inlet 105 and a seventh control valve 7. The lower cyclone separation unit 205a includes a first separation inlet 2051 and a first impurity outlet 2052. The upper cleaning unit 205b includes a first cleaning water inlet 2053, a first cleaning water outlet 2054, and a first filtered outlet 2012. The first cleaning water inlet 2053 is connected to the second end of the seventh control valve 7, and the first end of the seventh control valve 7 is connected to the cleaning water main inlet 105. The upper cleaning unit 205b is connected to the lower cyclone separation unit 205a. The control unit is connected to the seventh control valve 7 and is used to control the seventh control valve 7 to be in the open state when a purification start command is received, so that cleaning water enters the combined cyclone separator, thereby purifying the compressed air through the combined cyclone separator.

[0036] To further reduce the concentration of halide ions in compressed air, separator 205 can be a combined cyclone separator, which includes a lower cyclone separation unit 205a and an upper cleaning unit 205b, with the upper cleaning unit 205b and the lower cyclone separation unit 205a internally connected. (Reference) Figure 3The lower cyclone separator 205a includes a first separation inlet 2051 and a first impurity outlet 2052. Compressed air filtered by the first filter 204 first enters the lower cyclone separator 205a. The lower cyclone separator 205a can separate medium-sized solid impurities of 8μm and above from the compressed air and discharge the impurities through the first impurity outlet 2052. For example, the lower cyclone separator 205a can be made of carbon steel. Furthermore, the compressed air purified by the lower cyclone separator 205a enters the upper cleaning unit 205b. The upper cleaning unit 205b also includes a packing area. When the control unit receives the start purification command, it controls the seventh control valve 7 to be in the open state. At this time, cleaning water enters the packing area of ​​the upper cleaning unit 205b through the cleaning water inlet 105. When the compressed air passes through the packing area from bottom to top, the halogen ions carried in the compressed air will come into close contact with the cleaning water and dissolve in the cleaning water. The concentration of halogen ions in the compressed air passing through the packing area is less than 10 ppm. Furthermore, the cleaning water containing dissolved halogen ions flows out of the combined cyclone separator through the first cleaning water outlet 2054.

[0037] like Figure 3 As shown, the compressed air purification system also includes a main drain outlet 106 for cleaning water and a seventeenth control valve 17. The main drain outlet 106 is connected to the first end of the seventeenth control valve 17, and the second end of the seventeenth control valve 17 is connected to the first cleaning water outlet 2054. A control unit is also connected to the seventeenth control valve 17. When the control unit receives a purification start command, it controls the seventeenth control valve 17 to be open, allowing the cleaning water containing dissolved halogen ions to be discharged from the compressed air purification system through the main drain outlet 106. Furthermore, a separation plate is included at the top of the upper cleaning unit 205b to achieve gas-liquid separation. The separated liquid is also discharged from the compressed air purification system through the main drain outlet 106, ensuring that the droplet diameter in the compressed air at the first filter outlet 2012 is no greater than 8 μm. For example, the upper cleaning unit 205b can be made of stainless steel of 316L or higher.

[0038] In summary, when the control unit receives a start purification command, it opens the first, second, sixth, seventh, sixteenth, and seventeenth control valves and closes the fourth and fifth control valves, thereby purifying the compressed air using the first filter and separator. Simultaneously, it controls the opening and closing of the third control valve based on the pressure in the air tank. When the control unit receives a stop purification command, it closes the first, second, sixth, seventh, sixteenth, and seventeenth control valves and opens the fourth and fifth control valves, using the compressed air from the air tank to clean the first filter. Thus, this embodiment of the invention employs a multi-stage, targeted sequential impurity removal method, achieving step-by-step separation of impurities in the compressed air and ensuring separation efficiency. It should be noted that the compressed air purification system is not limited to using a first filter and separator; multiple stages of filtration can be implemented according to actual needs.

[0039] Optionally, Figure 4 This is a schematic diagram of another compressed air purification system provided in an embodiment of the present invention, as shown below. Figure 4 As shown, the compressed air purification system also includes a heat exchanger 206, a heating water inlet 107, a heating water outlet 108, and an eighth control valve 8. The heat exchanger 206 includes a heat exchange air inlet 2061, a heat exchange air outlet 2062, a heat exchange hot water inlet 2063, and a heat exchange hot water outlet 2064. The heat exchange air inlet 2061 is connected to the second end of the eighth control valve 8, the first end of the eighth control valve 8 is connected to the first filter outlet 2012, and the heat exchange air outlet 2062 is connected to the first end of the second control valve 2. The heating water inlet 107 is connected to the heat exchange hot water inlet 2063, and the heating water outlet 108 is connected to the heat exchange hot water outlet 2064. The control unit is connected to the eighth control valve 8 and is used to control the eighth control valve 8 to be in the open state when a purification start command is received, so that the heat exchanger 206 removes water mist from the compressed air.

[0040] To further purify compressed air and remove water mist, such as Figure 4As shown, the compressed air purification system also includes a heat exchanger 206, which includes a heat exchange air inlet 2061, a heat exchange air outlet 2062, a hot water inlet 2063, and a hot water outlet 2064. The compressed air purification system also includes an eighteenth control valve 18 and a nineteenth control valve 19. The hot water inlet 2063 is connected to the first end of the eighteenth control valve 18, the second end of the eighteenth control valve 18 is connected to the heating water inlet 107, the hot water outlet 2064 is connected to the first end of the nineteenth control valve 19, and the second end of the nineteenth control valve 19 is connected to the heating water outlet 108.

[0041] Simultaneously, the control unit is connected to both the eighteenth control valve 18 and the nineteenth control valve 19. When the control unit receives a start purification command, it controls the eighth control valve 8, the eighteenth control valve 18, and the nineteenth control valve 19 to be in the open state. At this time, heated water from outside the compressed air purification system enters the heat exchanger 206 through the heated water inlet 107. Simultaneously, the compressed air purified by the first filter 204 and the separator 205 also enters the heat exchanger 206. The heated water and compressed air exchange heat in the heat exchanger 206 to heat the water mist in the compressed air to above the dew point temperature, thereby removing the water mist from the compressed air. Further, the heated water, after completing the heat exchange with the compressed air, is discharged from the compressed air purification system through the heated water outlet 108. For example, the heated water can be the remaining hot water stored in the compressed air release system after heating the compressed air.

[0042] In an alternative embodiment, such as Figure 4 As shown, the compressed air purification system also includes an auxiliary electric heating device 207 and a temperature detection device 208. The two ends of the auxiliary electric heating device 207 are connected to the heating water inlet 107 and the hot water exchange inlet 2063, respectively. The temperature detection device 208 is connected to the heating water inlet 107 and is used to detect the temperature of the heating water inlet 107 to obtain the heating water temperature value. The control unit is connected to both the auxiliary electric heating device 207 and the temperature detection device 208, and is used to control the auxiliary electric heating device 207 to turn on when the heating water temperature value is lower than a preset temperature threshold.

[0043] To ensure that the temperature of the heating water input into the heat exchanger 206 from the heating water inlet 107 is high enough to heat the water mist in the compressed air to above the dew point temperature, a temperature detection device 208 can be installed at the heating water inlet 107 to detect the temperature of the heating water inlet 107 and obtain the heating water temperature value. This allows the heating water to be heated in time when the temperature is not high, ensuring that the water mist in the compressed air is completely removed.

[0044] Based on this, the auxiliary electric heating device 207 is set between the heating water inlet 107 and the hot water exchange inlet 2063. When the heating water temperature detected by the temperature detection device 208 is less than the preset temperature threshold, the control unit controls the auxiliary electric heating device 207 to turn on so as to heat the heating water.

[0045] It should be noted that the reference Figure 4 The first end of the third control valve 3 is connected to the first end of the second control valve 2. Therefore, when the control unit controls the third control valve 3 to be in the open state, the compressed air entering the air storage tank 202 is compressed air that has been de-watered by the heat exchanger 206.

[0046] When heat exchanger 206 heats compressed air to remove water mist, halides and chlorides in the water mist will precipitate and adhere to the inside of the heat exchange tubes of heat exchanger 206. Therefore, in an optional embodiment, Figure 5 This is a schematic diagram of another compressed air purification system provided in an embodiment of the present invention, as shown below. Figure 5 As shown, the compressed air purification system also includes a ninth control valve 9, a tenth control valve 10, a second cleaning water outlet 109, and a main cleaning water inlet 105.

[0047] The first end of the ninth control valve 9 is connected to the main inlet of cleaning water 105, and the second end of the ninth control valve 9 is connected to the outlet of heat exchange air 2062. The first end of the tenth control valve 10 is connected to the inlet of heat exchange air 2061, and the second end of the tenth control valve 10 is connected to the outlet of the second cleaning water 109. The control unit is connected to the ninth control valve 9 and the tenth control valve 10 respectively. When receiving a stop purification command, the control unit controls the ninth control valve 9 and the tenth control valve 10 to be in the open state in the first stage, and controls the third control valve 3 to be in the closed state, so that cleaning water enters the heat exchanger 206 to clean the heat exchanger 206.

[0048] When the control unit receives a stop purification command, it indicates that the compressed air purification system can begin self-cleaning. At this time, the control unit will control the control valves related to the purification function to be in the closed state, that is, control the first control valve 1, the second control valve 2, the sixth control valve 6, the seventh control valve 7, the eighth control valve 8, the sixteenth control valve 16, the seventeenth control valve 17, the eighteenth control valve 18, and the nineteenth control valve 19 to be in the closed state, and control the control valves related to the self-cleaning function to be in the open state.

[0049] Furthermore, the self-cleaning function of the compressed air purification system can be divided into two stages. In the first stage, the control unit controls the ninth control valve 9 and the tenth control valve 10 to be in the open state, and controls the third control valve 3 to be in the closed state. At this time, cleaning water enters the heat exchanger 206 through the ninth control valve 9 from the cleaning water inlet 105. In the heat exchanger 206, the halides and chlorides adsorbed on the heat exchange tubes are dissolved, and then discharged from the heat exchange air inlet 2061 to the second cleaning water outlet 109, thus achieving self-cleaning of the heat exchanger 206. For example, the heat exchanger 206 can be made of 2205 or 2507 double-sided stainless steel, which has stronger corrosion resistance.

[0050] Further, after cleaning the heat exchanger 206 with cleaning water, the process proceeds to the second stage. In the second stage, the control unit controls the ninth control valve 9 to be closed, and controls the third control valve 3 and the tenth control valve 10 to be open, so that the compressed air in the air tank 202 dries the heat exchanger 206. The second stage follows the first stage. (Reference) Figure 5 When the control unit controls the ninth control valve 9 to be closed and controls the third control valve 3 and the tenth control valve 10 to be open, the compressed air stored in the air tank 202 will enter the heat exchanger 206 through the third control valve 3 to dry the heat exchanger 206, and then be discharged from the second cleaning water outlet 109 through the tenth control valve 10. In this way, the heat exchanger 206 is kept dry after self-cleaning.

[0051] It is worth mentioning that when the control unit receives the stop purification command, the control unit can control the fourth control valve 4 and the fifth control valve 5 to be in the open state in the first stage, or in the second stage, so as to achieve self-cleaning of the first filter 204. This application does not limit this.

[0052] In addition, the compressed air purification system may also include a first impurity concentration sensor and a second impurity concentration sensor. The first impurity concentration sensor is connected to the cleaning air outlet 103 and the control unit, respectively, to detect the impurity concentration at the cleaning air outlet 103 and obtain a first impurity concentration value. Further, when the first impurity concentration value is less than a preset impurity concentration threshold, it indicates that the first filter 204 has been cleaned, and the control unit controls the fourth control valve 4 and the fifth control valve 5 to be closed. The second impurity concentration sensor is connected to the second cleaning water outlet 109 and the control unit, respectively, to detect the impurity concentration at the second cleaning water outlet 109 and obtain a second impurity concentration value. Further, when the second impurity concentration value is less than a preset impurity concentration threshold, it indicates that the heat exchanger 206 has been cleaned and can enter the second stage. The control unit controls the ninth control valve 9 to be closed and controls the third control valve 3 and the tenth control valve 10 to be open, so that the compressed air in the air tank 202 dries the heat exchanger 206. It should be noted that this application does not restrict the method for judging the degree of cleanliness of impurities in the first filter 204 and heat exchanger 206, and it can also be determined based on the cleaning time.

[0053] Furthermore, such as Figure 5 As shown, the compressed air purification system also includes a twentieth control valve 20. The first end of the twentieth control valve 20 is connected to the main inlet 105 for cleaning water. The second end of the twentieth control valve 20 is connected to the first end of both the seventh control valve 7 and the ninth control valve 9. The control unit is also connected to the twentieth control valve 20. When the compressed air purification system needs to use cleaning water, the control unit always controls the twentieth control valve 20 to be in the open state. That is, when the control unit controls either the seventh control valve 7 or the ninth control valve 9 to be in the open state, it will simultaneously control the twentieth control valve 20 to be in the open state.

[0054] Optionally, Figure 6 This is a schematic diagram of another compressed air purification system provided in an embodiment of the present invention, as shown below. Figure 6 As shown, the filtration device also includes a second filter 209 and a twelfth control valve 12. The compressed air purification system also includes an eleventh control valve 11, a second pressure detection device 210, a third pressure detection device 211, a fourth pressure detection device 212, and a fifth pressure detection device 213. The second filter 209 includes a second filter inlet 2091 and a second cleaning inlet 2092. The second filter inlet 2091 is connected to the second end of the eleventh control valve 11, the first end of the eleventh control valve 11 is connected to the compressed air inlet 101, the second cleaning inlet 2092 is connected to the first end of the twelfth control valve 12, and the second end of the twelfth control valve 12 is connected to the first separation inlet 2051.

[0055] The second pressure detection device 210 is connected to the first filter inlet 2011 and is used to detect the pressure of the first filter inlet 2011 and obtain a second pressure value. The third pressure detection device 211 is connected to the first cleaning inlet 2013 and is used to detect the pressure of the first cleaning inlet 2013 and obtain a third pressure value. The fourth pressure detection device 212 is connected to the second filter inlet 2091 and is used to detect the pressure of the second filter inlet 2091 and obtain a fourth pressure value. The fifth pressure detection device 213 is connected to the second cleaning inlet 2092 and is used to detect the pressure of the second cleaning inlet 2092 and obtain a fifth pressure value. The control unit is connected to the second pressure detection device 210, the third pressure detection device 211, the fourth pressure detection device 212, the fifth pressure detection device 213, the eleventh control valve 11, and the twelfth control valve 12, respectively.

[0056] The control unit is configured to, upon receiving a purification start command and when the difference between the second and third pressure values ​​exceeds a preset differential pressure threshold, control the first control valve 1 and the sixth control valve 6 to be closed, and control the eleventh control valve 11 and the twelfth control valve 12 to be open, so that the second filter 209 purifies the compressed air. The control unit is also configured to, upon receiving a purification start command and when the difference between the fourth and fifth pressure values ​​exceeds a preset differential pressure threshold, control the first control valve 1 and the sixth control valve 6 to be open, and control the eleventh control valve 11 and the twelfth control valve 12 to be closed, so that the first filter 204 purifies the compressed air.

[0057] Since the first filter 204 is located at the front end of the entire compressed air purification system, it is more prone to clogging. Therefore, a second filter 209 is added to the compressed air purification system so that when the first filter 204 is clogged, the compressed air purification system can filter through the second filter 209, thus preventing the entire compressed air purification system from failing to work due to the clogging of the first filter 204, thereby improving the working reliability of the compressed air purification system.

[0058] Specifically, a second pressure detection device 210 and a third pressure detection device 211 are respectively installed at the first filter inlet 2011 and the first cleaning inlet 2013 to detect the air pressure before and after the first filter 204. When the air pressure difference before and after the first filter 204 is large, it indicates that the first filter 204 may be blocked, and it can no longer filter compressed air. Therefore, when the difference between the second pressure value detected by the second pressure detection device 210 and the third pressure value detected by the third pressure detection device 211 is greater than the preset pressure difference threshold, the control unit controls the first control valve 1 and the sixth control valve 6 to be closed, and controls the eleventh control valve 11 and the twelfth control valve 12 to be open, so that the compressed air enters the second filter 209, where the compressed air is initially filtered, and then enters the separator 205.

[0059] Similarly, a fourth pressure detection device 212 and a fifth pressure detection device 213 are respectively installed at the second filter inlet 2091 and the second cleaning inlet 2092 to detect the air pressure before and after the second filter 209. When the air pressure difference before and after the second filter 209 is large, it indicates that the second filter 209 may be blocked, and it can no longer filter compressed air. Therefore, when the difference between the fourth pressure value detected by the fourth pressure detection device 212 and the fifth pressure value detected by the fifth pressure detection device 213 is greater than the preset pressure difference threshold, the control unit controls the first control valve 1 and the sixth control valve 6 to be in the open state, and controls the eleventh control valve 11 and the twelfth control valve 12 to be in the closed state, so that the compressed air enters the first filter 204, where the compressed air is initially filtered, and then enters the separator 205.

[0060] Continue to refer to Figure 6To further improve the service life of the compressed air purification system, the system also includes an online self-cleaning function for the first filter 204 and the second filter 209. This means that while purifying the compressed air, the system can simultaneously clean either the first filter 204 or the second filter 209. In an optional embodiment, the compressed air purification system further includes a thirteenth control valve 13, a fourteenth control valve 14, and a fifteenth control valve 15. The first end of the thirteenth control valve 13 is connected to the first cleaning inlet 2013, the second end of the thirteenth control valve 13 is connected to the first end of the fourth control valve 4, the first end of the fourteenth control valve 14 is connected to the first end of the fourth control valve 4, and the second end of the fourteenth control valve 14 is connected to the second cleaning inlet 2092. The second filter 209 also includes a second cleaning outlet 2093, the second end of the fifteenth control valve 15 is connected to the second cleaning outlet 2093, and the first end of the fifteenth control valve 15 is connected to the cleaning air outlet 103. The control unit is connected to the thirteenth control valve 13, the fourteenth control valve 14, and the fifteenth control valve 15, respectively. The control unit is used to control the fourth control valve 4, the thirteenth control valve 13, and the fifth control valve 5 to be in the open state, and to control the fourteenth control valve 14 and the fifteenth control valve 15 to be in the closed state, when the difference between the second pressure value and the third pressure value is greater than a preset differential pressure threshold, so that the compressed air in the air tank 202 cleans the first filter 204. The control unit is also used to control the fourth control valve 4, the fourteenth control valve 14, and the fifteenth control valve 15 to be in the open state, and to control the thirteenth control valve 13 and the fifth control valve 5 to be in the closed state, when the difference between the fourth pressure value and the fifth pressure value is greater than a preset differential pressure threshold, so that the compressed air in the air tank 202 cleans the second filter 209.

[0061] When the difference between the second and third pressure values ​​exceeds a preset differential pressure threshold, it indicates that the first filter 204 is clogged. At this time, the control unit controls the compressed air to be filtered by the second filter 209, and can also control the compressed air in the air tank 202 to clean the first filter 204. Specifically, when the difference between the second and third pressure values ​​exceeds the preset differential pressure threshold, the control unit controls the fourth control valve 4, the thirteenth control valve 13, and the fifth control valve 5 to be open, and controls the fourteenth control valve 14 and the fifteenth control valve 15 to be closed. At this time, the compressed air in the air tank 202 enters the first filter 204 through the fourth control valve 4 and the thirteenth control valve 13, blowing the impurities in the first filter 204 toward the cleaning air outlet 103, thereby realizing the online cleaning function of the first filter 204.

[0062] Similarly, when the difference between the fourth and fifth pressure values ​​exceeds a preset differential pressure threshold, it indicates that the second filter 209 is clogged. At this time, while controlling the compressed air to be filtered by the first filter 204, the control unit can also control the compressed air in the air tank 202 to clean the second filter 209. Specifically, when the difference between the fourth and fifth pressure values ​​exceeds the preset differential pressure threshold, the control unit controls the fourth control valve 4, the fourteenth control valve 14, and the fifteenth control valve 15 to be open, and controls the thirteenth control valve 13 and the fifth control valve 5 to be closed. At this time, the compressed air in the air tank 202 enters the second filter 209 through the fourth control valve 4 and the fourteenth control valve 14, blowing the impurities in the second filter 209 toward the cleaning air outlet 103, thereby realizing the online cleaning function of the second filter 209.

[0063] Understandably, after the first filter 204 or the second filter 209 has been cleaned using compressed air from the air tank 202, the control unit can also control the third control valve 3 to be in the open state so that compressed air enters the air tank 202 to replenish the compressed air in the air tank 202.

[0064] Furthermore, such as Figure 6 As shown, the compressed air purification system also includes a twenty-first control valve 21. The first end of the twenty-first control valve 21 is connected to the cleaning air outlet 103, and the second end of the twenty-first control valve 21 is connected to the first end of both the fifth control valve 5 and the fifteenth control valve 15. At the same time, the control unit is also connected to the twenty-first control valve 21. When cleaning the first filter 204 or the second filter 209, the control unit always controls the twenty-first control valve 21 to be in the open state. That is to say, when the control unit controls either the fifth control valve 5 or the fifteenth control valve 15 to be in the open state, it will also control the twenty-first control valve 21 to be in the open state at the same time.

[0065] The embodiments of the present invention realize the online self-cleaning function of the first filter and the second filter, thereby extending the service life of the compressed air purification system.

[0066] It is worth mentioning that the air passage of the aforementioned compressed air purification system can be set according to the pressure range of the salt cavern, typically 7-20 MPa.g, and the operating temperature range can be the maximum of the temperature range of the salt cavern and the heating water. Furthermore, the heating water temperature must be higher than the dew point temperature of the compressed air at the salt cavern outlet, typically allowing a margin of 5-10℃, meaning the operating temperature range of the compressed air purification system can be 20-70℃. Further, the pressure of the air storage tank is fluctuating, ranging from 0.1 to x MPa, where x is the pressure at the salt cavern outlet. To save costs, the pressure of the air storage tank can also be reduced to 0.1-5 MPa.

[0067] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, combinations, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A compressed air purification system, characterized in that, It includes a compressed air inlet, a first control valve, a filter device, a second control valve, a compressed air outlet, an air tank, a third control valve, a fourth control valve, a fifth control valve, a cleaning air outlet, and a control unit; The filtration device includes a first filter inlet, a first filter outlet, a first cleaning inlet, and a first cleaning outlet; the first filter inlet is connected to the second end of the first control valve, the first end of the first control valve is connected to the compressed air inlet, the first filter outlet is connected to the first end of the second control valve, and the second end of the second control valve is connected to the compressed air outlet. The air storage tank includes an air storage port; the air storage port is connected to the second end of the third control valve and the second end of the fourth control valve respectively; the first end of the third control valve is connected to the first end of the second control valve; the first end of the fourth control valve is connected to the first cleaning air inlet. The first cleaning air outlet is connected to the second end of the fifth control valve, and the first end of the fifth control valve is connected to the cleaning air outlet. The control unit is connected to the first control valve, the second control valve, the third control valve, the fourth control valve, and the fifth control valve, respectively. The control unit is configured to, upon receiving a start purification command, control both the first and second control valves to be in the open state, and control both the fourth and fifth control valves to be in the closed state, so that the filter device can purify the compressed air; it is also configured to, upon receiving a stop purification command, control both the first and second control valves to be in the closed state, and control both the fourth and fifth control valves to be in the open state, so that the compressed air in the air tank can clean the filter device.

2. The compressed air purification system according to claim 1, characterized in that, It also includes a first pressure detection device; The first pressure detection device is connected to the air storage port and is used to detect the pressure inside the air storage tank and obtain a first pressure value; The control unit is connected to the first pressure detection device and is used to control the third control valve to be in the open state when it receives the start purification command and the first pressure value is less than the preset pressure threshold.

3. The compressed air purification system according to claim 1, characterized in that, The filtration device includes a first filter, a separator, and a sixth control valve; The first filter includes a first filter inlet, a first cleaning inlet, and a first cleaning outlet; the separator includes a first separation inlet, a first impurity outlet, and the first filter outlet. The first cleaning air inlet is connected to the first end of the sixth control valve, and the second end of the sixth control valve is connected to the first separation air inlet; The control unit is connected to the sixth control valve and is used to control the sixth control valve to be in the open state when the purification start command is received, so that the first filter and the separator can purify the compressed air.

4. The compressed air purification system according to claim 3, characterized in that, The separator is a combined cyclone separator, which includes a lower cyclone separation unit and an upper cleaning unit; the compressed air purification system also includes a main cleaning water inlet and a seventh control valve. The lower cyclone separator unit includes the first separation air inlet and the first impurity outlet; the upper cleaning unit includes the first cleaning water inlet, the first cleaning water outlet and the first filter air outlet; the first cleaning water inlet is connected to the second end of the seventh control valve, and the first end of the seventh control valve is connected to the main cleaning water inlet; the upper cleaning unit is connected to the lower cyclone separator unit. The control unit is connected to the seventh control valve and is used to control the seventh control valve to be in the open state when the purification start command is received, so that cleaning water enters the combined cyclone separator and the combined cyclone separator purifies the compressed air.

5. The compressed air purification system according to claim 1, characterized in that, It also includes a heat exchanger, a heating water inlet, a heating water outlet, and an eighth control valve; The heat exchanger includes a heat exchange air inlet, a heat exchange air outlet, a heat exchange hot water inlet, and a heat exchange hot water outlet; the heat exchange air inlet is connected to the second end of the eighth control valve, the first end of the eighth control valve is connected to the first filter outlet, and the heat exchange air outlet is connected to the first end of the second control valve. The heating water inlet is connected to the hot water exchange inlet; the heating water outlet is connected to the hot water exchange outlet. The control unit is connected to the eighth control valve and is used to control the eighth control valve to be in the open state when the purification start command is received, so that the heat exchanger removes water mist from the compressed air.

6. The compressed air purification system according to claim 5, characterized in that, It also includes auxiliary electric heating devices and temperature detection devices; The two ends of the auxiliary electric heating device are respectively connected to the heating water inlet and the hot water exchange inlet; The temperature detection device is connected to the heating water inlet and is used to detect the temperature of the heating water inlet to obtain the heating water temperature value; The control unit is connected to the auxiliary electric heating device and the temperature detection device respectively, and is used to control the auxiliary electric heating device to turn on when the heating water temperature is less than a preset temperature threshold.

7. The compressed air purification system according to claim 5, characterized in that, It also includes a ninth control valve, a tenth control valve, a second cleaning water outlet, and a main cleaning water inlet; The first end of the ninth control valve is connected to the main inlet of the cleaning water, and the second end of the ninth control valve is connected to the outlet of the heat exchange air. The first end of the tenth control valve is connected to the heat exchange air inlet, and the second end of the tenth control valve is connected to the second cleaning water outlet. The control unit is connected to the ninth control valve and the tenth control valve respectively. When the control unit receives the stop purification command, in the first stage, it controls the ninth control valve and the tenth control valve to be in the open state, and controls the third control valve to be in the closed state, so that cleaning water enters the heat exchanger to clean the heat exchanger.

8. The compressed air purification system according to claim 7, characterized in that, The control unit is also configured to, in the second stage, control the ninth control valve to be closed and control the third and tenth control valves to be open when receiving the stop purification command, so that the compressed air in the air tank dries the heat exchanger; The second stage follows the first stage.

9. The compressed air purification system according to claim 3, characterized in that, The filtration device further includes a second filter and a twelfth control valve; the compressed air purification system further includes an eleventh control valve, a second pressure detection device, a third pressure detection device, a fourth pressure detection device, and a fifth pressure detection device; The second filter includes a second filter inlet and a second cleaning inlet; the second filter inlet is connected to the second end of the eleventh control valve, and the first end of the eleventh control valve is connected to the compressed air inlet; the second cleaning inlet is connected to the first end of the twelfth control valve; and the second end of the twelfth control valve is connected to the first separation inlet. The second pressure detection device is connected to the first filter inlet and is used to detect the pressure of the first filter inlet and obtain a second pressure value; the third pressure detection device is connected to the first cleaning inlet and is used to detect the pressure of the first cleaning inlet and obtain a third pressure value; the fourth pressure detection device is connected to the second filter inlet and is used to detect the pressure of the second filter inlet and obtain a fourth pressure value; the fifth pressure detection device is connected to the second cleaning inlet and is used to detect the pressure of the second cleaning inlet and obtain a fifth pressure value. The air control unit is connected to the second pressure detection device, the third pressure detection device, the fourth pressure detection device, the fifth pressure detection device, the eleventh control valve, and the twelfth control valve, respectively. The control unit is used to control the first control valve and the sixth control valve to be in a closed state and to control the eleventh control valve and the twelfth control valve to be in an open state when it receives the start purification command and the difference between the second air pressure value and the third air pressure value is greater than a preset differential pressure threshold, so that the second filter can purify the compressed air. The control unit is further configured to, upon receiving the start purification command and when the difference between the fourth pressure value and the fifth pressure value of the air is greater than the preset differential pressure threshold, control the first control valve and the sixth control valve to be in the open state, and control the eleventh control valve and the twelfth control valve to be in the closed state, so that the first filter can purify the compressed air.

10. The compressed air purification system according to claim 9, characterized in that, It also includes the thirteenth control valve, the fourteenth control valve, and the fifteenth control valve; The first end of the thirteenth control valve is connected to the first cleaning air inlet; the second end of the thirteenth control valve is connected to the first end of the fourth control valve; the first end of the fourteenth control valve is connected to the first end of the fourth control valve, and the second end of the fourteenth control valve is connected to the second cleaning air inlet. The second filter further includes a second cleaning air outlet; the second end of the fifteenth control valve is connected to the second cleaning air outlet, and the first end of the fifteenth control valve is connected to the cleaning air outlet; The control unit is connected to the thirteenth control valve, the fourteenth control valve, and the fifteenth control valve, respectively. The control unit is used to control the fourth control valve, the thirteenth control valve, and the fifth control valve to be in an open state, and to control the fourteenth control valve and the fifteenth control valve to be in a closed state when the difference between the second pressure value and the third pressure value of the air is greater than the preset differential pressure threshold, so that the compressed air in the air storage tank cleans the first filter; The control unit is also configured to, when the difference between the fourth pressure value and the fifth pressure value of the air is greater than the preset differential pressure threshold, control the fourth control valve, the fourteenth control valve and the fifteenth control valve to be in the open state, and control the thirteenth control valve and the fifth control valve to be in the closed state, so that the compressed air in the air storage tank cleans the second filter.

Images