A water-cooled compressed air supply system and control method thereof

Abstract

A water-cooled compressed air supply system, which uses a two-position regulated refrigeration compressor to consume low-cost valley electricity and flat electricity to make ice and store cold, and then uses chilled water with convenient flow regulation to achieve freeze drying, air intake pretreatment, oil cooling and compressed air post-cooling of compressed air, and uses cold energy in a cascaded manner. Through the setting of a front heat exchanger of the air compressor, the temperature of the chilled water is much lower than the ambient air temperature, and the heat exchange efficiency of water cooling is higher. The energy efficiency overcomes the problem of low energy efficiency and high failure rate of the air compressor caused by high temperature. The convenient flow regulation of chilled water overcomes the problem of low energy efficiency operation of partial load when the traditional dryer is selected according to the worst working conditions, resulting in low-efficiency operation of low-flow compressed air supply. In addition, the cooling of the system oil and air is mostly obtained by valley electricity, which can reduce the operating cost. After the refrigeration system is changed to ice making at night, the operating conditions are stable and there is no problem of partial load operation. This embodiment also provides a control method for water-cooled compressed air supply.

Description

Technical Field

[0001] The invention relates to the technical field of air compressors, and in particular to a water-cooled compressed air supply system and a control method thereof. Background Art

[0002] Compressed air, as an important power energy source second only to electric energy in modern industry, is widely used in many industrial production fields such as chemical industry, textile, shipbuilding, etc. due to its clean, pollution-free, safe and easy to transport characteristics. It is an indispensable and important part of the industrial production process. At the same time, the compressed air supply system composed of air compressors, gas storage tanks, filters and post-treatment cold dryers or adsorption dryers also consumes 9.5% to 10% of the total electricity generated in the country. Especially in the daytime operation process with high temperature and high humidity in summer, the industrial gas consumption is the largest and the energy consumption of the gas supply system is the highest. At this time, the electricity consumption is the peak electricity with high electricity prices, which will not only increase the power supply pressure of the power grid, but also bring huge economic burden to enterprises. In addition, the high suction temperature will increase the failure rate of the compressor. In the context of increasingly prominent energy and environmental issues, it is imperative to reduce the energy consumption and operating costs of compressed air systems.

[0003] The refrigerated compressor air dryer of the compressed air supply system is the most commonly used post-processing dryer. The energy consumption of the dryer is the most important energy-consuming equipment after the air compressor. When selecting the equipment, the dryer is required to ensure the maximum air supply and the pressure dew point temperature requirements of the compressed air supplied to the user at the highest inlet temperature and humidity. However, in most industrial applications, there is a phenomenon of large air consumption during the day and small air consumption at night; in addition, the aftercooler in the air compressor is mostly an air-cooled heat exchanger, and the temperature and humidity of the ambient air also have a great impact on the inlet temperature and humidity of the dryer, which makes the dryer run at partial load and low energy efficiency for a long time outside the daytime in summer, resulting in a lot of energy waste.

[0004] At present, the aftercoolers used for cooling the lubricating oil heat exchanger and cooling the compressed air in the air compressor unit are generally air-cooled tube-fin heat exchangers. The fans used are also selected according to the worst working conditions, and most of them are driven by fixed-frequency motors. This also leads to the problem of fan energy waste under low gas consumption and low ambient temperature conditions. In addition, affected by the heat transfer temperature difference, the achievable cooled oil temperature and compressed air temperature are also limited by the ambient temperature.

[0005] The energy waste of the dryer and air compressor fan due to deviation from the design working conditions, and the resulting increase in operating costs, are urgent problems that need to be solved in the compressed air supply system, which requires the adoption of an economically feasible energy regulation solution. In addition, the compressed air supply system has the current situation of high energy consumption during peak power and low energy consumption during valley power. The use of valley power will help reduce the operating cost of the air supply system.

[0006] In order to use valley electricity for energy regulation of the compressed air system, ensure stability when operating in a high-temperature environment in summer, and achieve high energy efficiency and low cost of the system when operating with variable air supply, the present invention designs a water-cooled compressed air supply system and a control method thereof. Summary of the invention

[0007] In view of the shortcomings of the prior art, the present invention provides a water-cooled compressed air supply system and a control method thereof, which can use valley electricity for energy regulation of the compressed air system, ensure stability when operating in a high-temperature environment in summer, and achieve high energy efficiency and low cost of the system when operating with variable air supply.

[0008] To achieve the above object, the present invention provides the following technical solutions: On the one hand, a water-cooled compressed air supply system is provided, including an air compressor subsystem, a chilled water circulation subsystem and a refrigeration ice storage subsystem, wherein the air compressor system includes an air intake filter, a preheat exchanger, an air compressor, an oil separator, an oil cooler, an aftercooler, a first air storage tank, a prefilter, a heat regenerator, a dry heat exchanger, a afterfilter and a second air storage tank, wherein one of the outlet pipes of the air intake filter is connected to the a1 inlet of the preheat exchanger via a first stop valve, and the other is connected to the a2 outlet pipe of the preheat exchanger via a second stop valve, and the a 2 outlet is connected to the air compressor inlet through a pipeline, the air compressor outlet is connected to the oil separator barrel, the lubricating oil outlet at the bottom of the oil separator barrel is connected to the c1 inlet of the oil cooler through a pipeline, and is connected back to the air compressor through the c2 outlet, the air outlet of the oil separator barrel is connected to the pre-filter through the e1 inlet and e2 outlet of the aftercooler and the first air storage tank, and the pre-filter outlet is connected to the second air storage tank through a pipeline in sequence through the g1 inlet of the regenerator, the h1 and h2 interfaces of the dry heat exchanger, the g2 outlet of the regenerator and the after-filter; The chilled water circulation subsystem includes an ice storage tank, a circulating water pump, a dry heat exchanger, a front heat exchanger, an oil cooler and an aftercooler. The chilled water outlet of the ice storage tank is connected to the inlet of the circulating water pump. The outlet of the circulating water pump is connected to the i1 inlet of the dry heat exchanger through a flow regulating valve. The i2 outlet of the dry heat exchanger is connected to the inlet of the first three-way regulating valve. The first outlet of the first three-barrel regulating valve is connected to the b1 inlet of the front heat exchanger. The b2 outlet of the front heat exchanger is connected to the second outlet of the first three-way regulating valve through a pipeline and is connected to the inlet of the second three-way regulating valve. The first outlet of the second three-way regulating valve is connected to the d1 inlet of the oil cooler. The second outlet of the second three-way regulating valve is connected to the f1 inlet of the aftercooler. The d2 outlet of the oil cooler and the f2 outlet of the aftercooler are connected back to the ice storage tank through a pipeline. The refrigeration ice storage subsystem includes a refrigeration compressor, a condenser, a throttle valve, an evaporation coil and an ice storage pool. The refrigeration compressor outlet is connected to the condenser, the throttle valve and the evaporation coil in sequence, and the evaporation coil outlet is connected back to the refrigeration compressor inlet. The evaporation coil is arranged in the ice storage pool.

[0009] Furthermore, a travel switch is provided on the upper part of the ice storage tank, a first temperature controller is provided on the chilled water outlet pipeline of the ice storage tank, and the travel switch and the first temperature controller are connected to the refrigeration compressor via a signal line.

[0010] Furthermore, a second temperature controller is provided on the air outlet pipeline of the front heat exchanger and is connected to the first three-way regulating valve through a signal line. A third temperature controller is provided on the lubricating oil outlet pipeline of the oil cooler and is connected to the second three-way regulating valve through a signal line.

[0011] Furthermore, a dew point temperature controller is provided on the g2 outlet pipeline of the regenerator and is connected to the flow regulating valve via a signal line.

[0012] On the other hand, a water-cooled compressed air supply control method is provided, comprising: (1) Refrigeration ice storage control method In the normal power stage, you can manually choose whether to store cold and make ice. In the valley power stage, the system automatically stores cold and makes ice. When storing cold and making ice, the refrigeration compressor is turned on, and the heat absorbed by the refrigerant in the evaporator coil is used to cool the water in the ice storage tank and make ice. The travel switch is used to determine whether the maximum ice storage capacity has been reached. When the maximum ice storage capacity has been reached, the travel switch controls the refrigeration compressor to shut down and stop ice storage. During operation, once the water temperature at the outlet of the ice storage tank is higher than the set temperature of the first temperature controller, the first temperature controller controls the refrigeration compressor to start and cool the water in the ice storage tank; (2) Intake pretreatment control method According to the ambient temperature, the switch of the first stop valve and the second stop valve is controlled manually or by installing a second ambient temperature controller 126, that is, when the ambient temperature is not high, the first stop valve is closed and the second stop valve is opened, and the ambient air filtered by the suction filter directly enters the air compressor for compression; when the ambient temperature is high, the first stop valve is opened and the second stop valve is closed, and the ambient air filtered by the suction filter enters the front heat exchanger for suction pretreatment, and enters the air compressor after being cooled, cooled and dehumidified by chilled water, and the first three-way regulating valve is controlled by the second temperature controller to adjust the chilled water flow entering the front heat exchanger to control the air compressor suction temperature; when the temperature is higher than the set temperature of the second temperature controller, the opening of the first three-way regulating valve is adjusted to increase the chilled water flow entering the front heat exchanger; when the ambient air does not enter the front heat exchanger, the chilled water directly flows into the second three-way regulating valve through the second outlet of the first three-way regulating valve; (3) Oil cooling temperature control method The outlet lubricating oil temperature of the oil cooler is controlled by the third temperature controller to control the opening of the second three-way regulating valve, and the chilled water flow entering the oil cooler is controlled. When the outlet oil temperature of the oil cooler increases, the chilled water flow entering the oil cooler is increased, and vice versa, the remaining chilled water flows into the aftercooler to cool the compressed air. (4) Compressed air dew point temperature control method The dew point temperature controller on the G2 compressed air outlet pipeline of the regenerator is used to control the opening of the flow control valve, and the dew point temperature of the compressed air is controlled by regulating the chilled water circulation flow. When the dew point temperature of the outlet compressed air increases, the opening of the flow control valve is increased to increase the chilled water flow.

[0013] According to the water-cooled compressed air supply system and control method thereof of the above-mentioned embodiment of the present invention, the cold compressed air supply system includes an air compressor subsystem, a chilled water circulation subsystem and a refrigeration ice storage subsystem. Through a two-position regulated refrigeration compressor, low-cost valley electricity and flat electricity are consumed to make ice and store cold, and then the flow-controlled chilled water is used to simultaneously realize freeze drying, air intake pretreatment, oil cooling and compressed air post-cooling of the compressed air, and the cold energy is utilized in a cascade manner; and through the setting of a front heat exchanger of the air compressor, the chilled water temperature is much lower than the ambient air temperature, and the heat exchange efficiency of water cooling is higher, which can It can effectively overcome the problem of low energy efficiency and high failure rate of air compressor caused by high temperature, so it can overcome the limitation of ambient temperature on oil cooling temperature, effectively control the lubricating oil temperature, and ensure high energy efficiency operation of air compressor. In addition, the convenience of chilled water flow regulation overcomes the problem of low energy efficiency operation of partial load when traditional cold dryers are selected according to the worst working conditions, resulting in low flow compressed air supply. In addition, the cooling energy of system oil and air is basically obtained by valley electricity, which can greatly reduce the operating cost of the air supply system. After the refrigeration system is changed to ice making at night, the operating conditions are stable and there is no problem of partial load operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solution of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0015] Figure 1 It is a structural schematic diagram of a water-cooled compressed air supply system provided in one embodiment of the present invention. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] See also Figure 1In this embodiment, a water-cooled compressed air supply system includes an air compressor subsystem, a chilled water circulation subsystem and a refrigeration ice storage subsystem. The air compressor system includes an air intake filter 100, a preheat exchanger 101, an air compressor 103, an oil separator 104, an oil cooler 105, an aftercooler 106, a first air storage tank 107, a prefilter 108, a regenerator 109, a dry heat exchanger 110, a afterfilter 111 and a second air storage tank 112. One of the outlet pipes of the air intake filter 100 is connected to the a1 inlet of the preheat exchanger 101 through a first stop valve 113, and the other is connected to the a2 outlet pipe of the preheat exchanger 101 through a second stop valve 114. The air intake filter 100 is used to filter ambient air. In this way, when the ambient temperature is not high, the first stop valve 114 is connected to the a2 outlet pipe of the preheat exchanger 101. The check valve 113 is closed, and the second stop valve 114 is opened. The ambient air filtered by the intake filter 100 directly enters the air compressor 103 for compression. When the ambient temperature is high, the first stop valve 113 is opened, and the second stop valve 114 is closed. The ambient air filtered by the intake filter 100 enters the preheat exchanger 101 for intake pretreatment. The a2 outlet of the preheat exchanger 101 is connected to the inlet of the air compressor 103 via a pipeline. A second temperature controller 126 is provided on the air outlet pipeline of the preheat exchanger 101, and is connected to the first three-way regulating valve 118 via a signal line. The lubricating oil outlet pipeline of the oil cooler 105 is provided with a third temperature controller 127, and is connected to the second three-way regulating valve 119 via a signal line. The preheat exchanger 101 The air is used for air intake pretreatment, and is cooled and dehumidified by chilled water before entering the air compressor 103. The first three-way regulating valve 118 is controlled by the second temperature controller 126 to adjust the chilled water flow entering the front heat exchanger 101, so as to control the air intake temperature of the air compressor. When the temperature is higher than the set temperature of the second temperature controller 126, the opening of the first three-way regulating valve 118 is adjusted to increase the chilled water flow entering the front heat exchanger 101. When the ambient air does not enter the front heat exchanger 101, the chilled water flows directly into the second three-way regulating valve 118 through the second outlet of the first three-way regulating valve 118. The outlet of the air compressor 103 is connected to the oil separator 104. The lubricating oil outlet at the bottom of the oil separator 104 is connected to the c1 inlet of the oil cooler 105 through a pipeline, and is connected back to the air compressor 103 through the c2 outlet. The lubricating oil temperature at the outlet of the oil cooler 105 is controlled by the third temperature controller 127 to control the opening of the second three-way regulating valve 119, and the flow of chilled water entering the oil cooler 127 is controlled. The air outlet of the oil separator 104 is connected to the pre-filter 108 through the e1 inlet and e2 outlet of the aftercooler 106 and the first air storage tank 107.The outlet of the pre-filter 108 is connected to the second air storage tank 112 through a pipeline in sequence through the g1 inlet of the regenerator 109, the h1 and h2 interfaces of the drying heat exchanger 110, the g2 outlet of the regenerator 109 and the post-filter 111. When the outlet oil temperature of the oil cooler 105 increases, the flow rate of chilled water entering the oil cooler 105 increases, otherwise it decreases, and the remaining chilled water all flows into the post-cooler 106 to cool the compressed air; The chilled water circulation subsystem includes an ice storage tank 115, a circulating water pump 116, a dry heat exchanger 110, a front heat exchanger 101, an oil cooler 105 and an aftercooler 106. The chilled water outlet of the ice storage tank 115 is connected to the inlet of the circulating water pump 116. The outlet of the circulating water pump 116 is connected to the i1 inlet of the dry heat exchanger 110 through a flow regulating valve 117. The i2 outlet of the dry heat exchanger is connected to the inlet of the first three-way regulating valve 118. The first outlet of the first three-way regulating valve 118 is connected to the b1 inlet of the front heat exchanger 101. The b2 outlet of the front heat exchanger 101 is connected to the second outlet of the first three-way regulating valve 118 through a pipeline, and is connected to the inlet of the second three-way regulating valve 119. The first outlet of the second three-way regulating valve 119 is connected to the d1 inlet of the oil cooler 105. The second outlet of the second three-way regulating valve 119 is connected to the d2 inlet of the oil cooler 105. The outlet is connected to the f1 inlet of the aftercooler 106, a dew point temperature controller 128 is provided on the g2 outlet pipeline of the regenerator 109, and is connected to the flow regulating valve 117 through a signal line, and the d2 outlet of the oil cooler 105 and the f2 outlet of the aftercooler 106 are connected back to the ice storage tank 115 through a pipeline. In this way, the dew point temperature controller 128 on the g2 compressed air outlet pipeline of the regenerator 109 is used to control the opening of the flow regulating valve 117, and the dew point temperature of the compressed air is controlled by regulating the circulation flow of the chilled water. When the dew point temperature of the outlet compressed air increases, the opening of the flow regulating valve 117 is increased to increase the chilled water flow. Through the setting of the front heat exchanger 101, the chilled water temperature is much lower than the ambient air temperature, and the heat exchange efficiency of water cooling is higher, and the energy efficiency overcomes the problem of low energy efficiency and high failure rate of the air compressor caused by high temperature.

[0018] The refrigeration ice storage subsystem includes a refrigeration compressor 120, a condenser 121, a throttle valve 122, an evaporation coil 123 and an ice storage tank 115. The refrigeration compressor 120 is a two-position regulated refrigeration compressor. The outlet of the refrigeration compressor 120 is connected to the condenser 121, the throttle valve 122 and the evaporation coil 123 in sequence. The outlet of the evaporation coil 123 is connected back to the inlet of the refrigeration compressor 120. The evaporation coil 123 is arranged in the ice storage tank 115. In this way, the two-position regulated refrigeration compressor 120 consumes low-cost valley electricity and flat electricity to make ice and store cold, and then the flow-adjustable chilled water is used to realize freeze drying of compressed air, air intake pretreatment, oil cooling and compressed air post-cooling, and the cold energy is utilized in a cascade.

[0019] In this embodiment, a travel switch 124 is provided on the upper part of the ice storage tank 115, and a first temperature controller 125 is provided on the chilled water outlet pipe of the ice storage tank 115. The travel switch 124 and the first temperature controller 125 are connected to the refrigeration compressor 120 via a signal line. Accordingly, if Figure 1 As shown, an embodiment of the present invention provides a control method for a water-cooled compressed air supply system, comprising: (1) Refrigeration ice storage control method In the normal power stage, you can manually select whether to store cold and make ice. In the valley power stage, the system automatically stores cold and makes ice. When storing cold and making ice, the refrigeration compressor 120 is turned on, and the heat absorbed by the refrigerant in the evaporating coil 123 is used to cool the water in the ice storage tank 115 to make ice. The travel switch 124 is used to determine whether the maximum ice storage capacity has been reached. When the maximum ice storage capacity has been reached, the travel switch 124 controls the refrigeration compressor 120 to shut down and stop storing ice. During operation, once the water temperature at the outlet of the ice storage tank 115 is higher than the set temperature of the first temperature controller 125, the first temperature controller 125 controls the refrigeration compressor 120 to start, and cools the water in the ice storage tank 115; (2) Intake pretreatment control method According to the ambient temperature, the first stop valve 113 and the second stop valve 114 are controlled manually or by installing a second ambient temperature controller 126. That is, when the ambient temperature is not high, the first stop valve 113 is closed, the second stop valve 114 is opened, and the ambient air filtered by the air intake filter 100 directly enters the air compressor 103 for compression. When the ambient temperature is high, the first stop valve 113 is opened, the second stop valve 114 is closed, and the ambient air filtered by the air intake filter 100 enters the front heat exchanger 101 for air intake pretreatment and is cooled by refrigerated water. After cooling and dehumidifying, the water enters the air compressor 103 again, and controls the first three-way regulating valve 118 through the second temperature controller 126 to adjust the flow of chilled water entering the front heat exchanger 101, so as to control the suction temperature of the air compressor. When the temperature is higher than the set temperature of the second temperature controller 126, the opening of the first three-way regulating valve 118 is adjusted to increase the flow of chilled water entering the front heat exchanger 101. When the ambient air does not enter the front heat exchanger 101, the chilled water flows directly into the second three-way regulating valve 119 through the second outlet of the first three-way regulating valve 118; (3) Oil cooling temperature control method The outlet lubricating oil temperature of the oil cooler 105 is controlled by the third temperature controller 127 to control the opening of the second three-way regulating valve 119, and the flow of chilled water entering the oil cooler 127 is controlled. When the outlet oil temperature of the oil cooler 105 increases, the flow of chilled water entering the oil cooler 105 is increased, and vice versa, the flow of chilled water entering the oil cooler 105 is reduced, and the remaining chilled water all flows into the aftercooler 106 to cool the compressed air; (4) Compressed air dew point temperature control method The dew point temperature controller 128 on the g2 compressed air outlet pipeline of the regenerator 109 is used to control the opening of the flow regulating valve 117, and the dew point temperature of the compressed air is controlled by regulating the chilled water circulation flow. When the dew point temperature of the outlet compressed air increases, the opening of the flow regulating valve 117 is increased to increase the chilled water flow.

[0020] According to the water-cooled compressed air supply system and control method thereof of the above-mentioned embodiment of the present invention, the cold compressed air supply system includes an air compressor subsystem, a chilled water circulation subsystem and a refrigeration ice storage subsystem. Through a two-position regulated refrigeration compressor, low-cost valley electricity and flat electricity are consumed to make ice and store cold, and then the flow-controlled chilled water is used to simultaneously realize freeze drying, air intake pretreatment, oil cooling and compressed air post-cooling of the compressed air, and the cold energy is utilized in a cascade manner; and through the setting of a front heat exchanger of the air compressor, the chilled water temperature is much lower than the ambient air temperature, and the heat exchange efficiency of water cooling is higher, which can It can effectively overcome the problem of low energy efficiency and high failure rate of air compressor caused by high temperature, so it can overcome the limitation of ambient temperature on oil cooling temperature, effectively control the lubricating oil temperature, and ensure high energy efficiency operation of air compressor. In addition, the convenience of chilled water flow regulation overcomes the problem of low energy efficiency operation of partial load when traditional cold dryers are selected according to the worst working conditions, resulting in low flow compressed air supply. In addition, the cooling energy of system oil and air is basically obtained by valley electricity, which can greatly reduce the operating cost of the air supply system. After the refrigeration system is changed to ice making at night, the operating conditions are stable and there is no problem of partial load operation.

[0021] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0022] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A water-cooled compressed air supply system, characterized in that: The invention comprises an air compressor subsystem, a chilled water circulation subsystem and a refrigeration ice storage subsystem. The air compressor system comprises an air intake filter 100, a preheat exchanger 101, an air compressor 103, an oil separator 104, an oil cooler 105, an aftercooler 106, a first air storage tank 107, a prefilter 108, a regenerator 109, a drying heat exchanger 110, a afterfilter 111 and a second air storage tank 112. One of the outlet pipes of the air intake filter 100 is connected to the a1 inlet of the preheat exchanger 101 through a first stop valve 113, and the other is connected to the a2 outlet pipe of the preheat exchanger 101 through a second stop valve 114. The a2 outlet of the preheat exchanger 101 is connected to the a1 inlet of the preheat exchanger 101 through a pipe. The inlet of the air compressor 103 and the outlet of the air compressor 103 are connected to the oil separator barrel 104. The lubricating oil outlet at the bottom of the oil separator barrel 104 is connected to the c1 inlet of the oil cooler 105 through a pipeline, and is connected back to the air compressor 103 through the c2 outlet. The air outlet of the oil separator barrel 104 is connected to the inlet of the pre-filter 108 through the e1 inlet and e2 outlet of the aftercooler 106 and the first air storage tank 107. The outlet of the pre-filter 108 is connected to the second air storage tank 112 through a pipeline in sequence through the g1 inlet of the regenerator 109, the h1 and h2 interfaces of the drying heat exchanger 110, the g2 outlet of the regenerator 109 and the after-filter 111; The chilled water circulation subsystem includes an ice storage tank 115, a circulating water pump 116, a dry heat exchanger 110, a front heat exchanger 101, an oil cooler 105 and an aftercooler 106. The chilled water outlet of the ice storage tank 115 is connected to the inlet of the circulating water pump 116. The outlet of the circulating water pump 116 is connected to the i1 inlet of the dry heat exchanger 110 through a flow regulating valve 117. The i2 outlet of the dry heat exchanger is connected to the inlet of the first three-way regulating valve 118. The first outlet of the first three-barrel regulating valve 118 is connected to the front heat exchanger 101. The b1 inlet of the preheat exchanger 101, the b2 outlet of the preheat exchanger 101 is connected to the second outlet of the first three-way regulating valve 118 through a pipeline, and are connected to the inlet of the second three-way regulating valve 119. The first outlet of the second three-way regulating valve 119 is connected to the d1 inlet of the oil cooler 105, and the second outlet of the second three-way regulating valve 119 is connected to the f1 inlet of the aftercooler 106. The d2 outlet of the oil cooler 105 and the f2 outlet of the aftercooler 106 are connected back to the ice storage tank 115 through a pipeline. The refrigeration ice storage subsystem includes a refrigeration compressor 120, a condenser 121, a throttle valve 122, an evaporation coil 123 and an ice storage pool 115. The outlet of the refrigeration compressor 120 is connected to the condenser 121, the throttle valve 122 and the evaporation coil 123 in sequence. The outlet of the evaporation coil 123 is connected back to the inlet of the refrigeration compressor 120. The evaporation coil 123 is arranged in the ice storage pool 115.

2. A water-cooled compressed air supply system according to claim 1, characterized in that: A travel switch 124 is provided on the upper part of the ice storage tank 115 , and a first temperature controller 125 is provided on the chilled water outlet pipeline of the ice storage tank 115 . The travel switch 124 and the first temperature controller 125 are connected to the refrigeration compressor 120 via a signal line.

3. A water-cooled compressed air supply system according to claim 1, characterized in that: A second temperature controller 126 is provided on the air outlet pipeline of the front heat exchanger 101, and is connected to the first three-way regulating valve 118 through a signal line. A third temperature controller 127 is provided on the lubricating oil outlet pipeline of the oil cooler 105, and is connected to the second three-way regulating valve 119 through a signal line.

4. A water-cooled compressed air supply system according to claim 1, characterized in that: A dew point temperature controller 128 is provided on the g2 outlet pipeline of the regenerator 109 and is connected to the flow regulating valve 117 via a signal line.

5. The control method of the water-cooled compressed air supply system according to any one of claims 1 to 4, characterized in that: include: (1) Refrigeration ice storage control method In the normal power stage, you can manually select whether to store cold and make ice. In the valley power stage, the system automatically stores cold and makes ice. When storing cold and making ice, the refrigeration compressor 120 is turned on, and the heat absorbed by the refrigerant in the evaporating coil 123 is used to cool the water in the ice storage tank 115 to make ice. The travel switch 124 is used to determine whether the maximum ice storage capacity has been reached. When the maximum ice storage capacity has been reached, the travel switch 124 controls the refrigeration compressor 120 to shut down and stop storing ice. During operation, once the water temperature at the outlet of the ice storage tank 115 is higher than the set temperature of the first temperature controller 125, the first temperature controller 125 controls the refrigeration compressor 120 to start, and cools the water in the ice storage tank 115; (2) Intake pretreatment control method According to the ambient temperature, the first stop valve 113 and the second stop valve 114 are controlled manually or by installing a second ambient temperature controller 126. That is, when the ambient temperature is not high, the first stop valve 113 is closed, the second stop valve 114 is opened, and the ambient air filtered by the air intake filter 100 directly enters the air compressor 103 for compression. When the ambient temperature is high, the first stop valve 113 is opened, the second stop valve 114 is closed, and the ambient air filtered by the air intake filter 100 enters the front heat exchanger 101 for air intake pretreatment and is cooled by refrigerated water. After cooling and dehumidifying, the water enters the air compressor 103 again, and controls the first three-way regulating valve 118 through the second temperature controller 126 to adjust the flow of chilled water entering the front heat exchanger 101, so as to control the suction temperature of the air compressor. When the temperature is higher than the set temperature of the second temperature controller 126, the opening of the first three-way regulating valve 118 is adjusted to increase the flow of chilled water entering the front heat exchanger 101. When the ambient air does not enter the front heat exchanger 101, the chilled water flows directly into the second three-way regulating valve 119 through the second outlet of the first three-way regulating valve 118; (3) Oil cooling temperature control method The outlet lubricating oil temperature of the oil cooler 105 is controlled by the third temperature controller 127 to control the opening of the second three-way regulating valve 119, and the flow of chilled water entering the oil cooler 127 is controlled. When the outlet oil temperature of the oil cooler 105 increases, the flow of chilled water entering the oil cooler 105 is increased, and vice versa, the flow of chilled water entering the oil cooler 105 is reduced, and the remaining chilled water all flows into the aftercooler 106 to cool the compressed air; (4) Compressed air dew point temperature control method The dew point temperature controller 128 on the g2 compressed air outlet pipeline of the regenerator 109 is used to control the opening of the flow regulating valve 117, and the dew point temperature of the compressed air is controlled by regulating the chilled water circulation flow. When the dew point temperature of the outlet compressed air increases, the opening of the flow regulating valve 117 is increased to increase the chilled water flow.

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