CN113565740B - Air compressor air suction pretreatment system and control method thereof - Google Patents

Abstract

An air compressor suction pretreatment system and its control method, the system includes an air compressor, a heat exchanger, a closed cooling tower, a water chiller, a cold water tank, a circulating water pump, a spray pump and a control valve, and a water circuit of the heat exchanger The outlet is connected to the inlet of the closed cooling tower, the outlet of the closed cooling tower is connected to the water inlet of the evaporator of the chiller, the water outlet of the evaporator of the chiller is connected to the inlet of the cold water tank, the outlet of the cold water tank is connected to the inlet of the water pump, and the outlet of the water pump is connected to the electric tee The regulating valve, the electric three-way regulating valve, one path is connected to the inlet of the waterway of the heat exchanger, the other path is connected to the outlet of the waterway of the heat exchanger, and the air outlet of the heat exchanger is connected to the inlet of the air compressor. The invention adopts the combined operation of the closed cooling tower and the water chiller, uses cold water to cool down the air at the suction end of the air compressor, and uses sensors to precisely control the suction temperature of the air compressor to avoid the suction of the air compressor with liquid , which solves the problems of high energy consumption and low stability of the air compressor caused by the high suction temperature.

Description

Air compressor suction pretreatment system and control method thereof

technical field

The invention belongs to the technical field of compressed air, and in particular relates to an air compressor suction pretreatment system and a control method thereof.

Background technique

Air compressors are widely used in chemical, pharmaceutical, textile, shipbuilding and other fields, and are an indispensable and important part of the production process. In the production process of most factories, the energy consumption of the air compressor accounts for 10% to 35% of the total energy consumption. Therefore, under the same compression ratio, how to effectively reduce the energy consumption of the air compressor to compress the unit volume of air is currently an expert. Scholars' research hotspots.

At present, the energy-saving methods for air compressors are divided into two categories. The first category is for the internal structure transformation of the air compressor itself, frequency conversion transformation, friction loss reduction, etc.; the second category is for the treatment of the air at the front end of the air compressor, such as pre-cooling, intermediate cooling, terminal cooling, waste heat recovery and other measures. For a given air compressor, its energy consumption is determined by both the suction state and the exhaust state. When the intake pressure is constant, the operating efficiency of the compressor decreases with the increase of its suction temperature, and the suction The higher the temperature, the higher the exhaust temperature, and the higher exhaust temperature will cause the viscosity of the lubricating oil to decrease, which will cause failure. The research on air compressor exhaust treatment has been relatively mature, but the current research on air compressor suction pretreatment is still very scarce. Especially when the intake air temperature is improperly controlled, when the surface temperature of the heat exchanger is lower than the air dew point temperature, the moisture in the air will condense, causing the compressor to absorb liquid, which will cause the compressor to malfunction.

How to effectively pretreat the suction end of the air compressor, reduce the energy consumption of the air compressor, and at the same time avoid water droplets on the suction of the air compressor, so as to ensure the normal operation of the air compressor, this is a problem to be solved.

Contents of the invention

The object of the present invention is to provide an air compressor suction pretreatment system and a control method thereof in view of the problems existing in the above-mentioned prior art.

For realizing the purpose of the present invention, the technical scheme that the present invention adopts is:

An air compressor suction pretreatment system, including a water chiller 200, a closed cooling tower 100, a heat exchanger 301, a cold water tank 302, a circulating water pump 303, an electric three-way regulating valve 304, a filter 401, and an air compressor 402 ; wherein the closed cooling tower 100 includes a spray pump 101, a fan 102, a water receiver 103, a spray port 104, a heat exchange coil 105, and an air intake grille 106; the chiller 200 includes a chiller evaporator 201, refrigeration compressor 202, chiller condenser 203, throttle valve 204;

One outlet of the filter 401 is connected to the pipeline between the outlet b of the heat exchanger 301 and the suction port of the air compressor 402 through the first solenoid valve 403, and the other outlet is connected to the inlet a of the heat exchanger 301 by a pipeline for heat exchange. The outlet b of the device 301 is connected to the suction port of the air compressor 402 by a pipeline; the outlet d of the heat exchanger 301 is connected to the inlet m of the closed cooling tower 100 by a pipeline, and the outlet n of the closed cooling tower 100 is connected to The inlet e of the chiller evaporator 201 is connected to the pipeline between the outlet f of the chiller evaporator 201 and the cold water tank 302 through the third electromagnetic valve 306, and the outlet f of the chiller evaporator 201 is connected to the inlet of the cold water tank 302 by a pipeline , the outlet of the cold water tank 302 is connected to the inlet of the circulating water pump 303 by a pipeline, the outlet of the circulating water pump 303 is connected to the inlet i of the electric three-way regulating valve 304 by a pipeline, and the outlet k of the electric three-way regulating valve 304 is connected to the inlet c of the heat exchanger 301 by a pipeline. The outlet j of the electric three-way regulating valve 304 is connected to the pipeline between the outlet d of the heat exchanger 301 and the inlet m of the closed cooling tower 100 by a pipeline;

The outlet of the refrigeration compressor 202 is connected to the inlet of the chiller condenser 203 by a pipeline, the outlet of the condenser 203 of the chiller is connected to the inlet h of the evaporator 201 of the chiller through a throttle valve 204, and the outlet g of the evaporator 201 of the chiller is connected to The inlet of the refrigeration compressor 202; the inside of the closed cooling tower 100 is provided with a fan 102, a water receiver 103, a spray port 104, a heat exchange coil 105, and an inlet grille 106 from top to bottom. The outlet of the solution at the bottom of 100 is connected to the inlet of the spray pump 101 by a pipeline, and the outlet of the spray pump 101 is connected to the spray port 104 on the top of the closed cooling tower 100 by a pipeline;

Further preferably, the chiller 200 is a frequency conversion medium temperature chiller;

Further preferably, when the cooling load of the chiller 200 is below 70kW, the condenser 203 of the chiller adopts an air-cooled condenser; when the cooling load of the chiller 200 is above 70kW, the condenser 203 of the chiller adopts a water-cooled condenser;

Further preferably, a first temperature controller 404 is provided on the pipeline between the outlet of the filter 401 and the inlet a of the heat exchanger 301, and the first temperature controller 404 is connected to the spray pump 101 and the fan 102 through wires; On the outlet b of the heat exchanger 301, the outlet of the first electromagnetic valve 403, and the suction pipeline of the air compressor 402, that is, the pipeline before the connection point of the first electromagnetic valve 403 is provided with a second temperature controller 405, and the second temperature controller 405 is connected to the electric three-way regulating valve 304 through a wire; the pipeline between the outlet n of the closed cooling tower 100 and the inlet of the second solenoid valve 305 is provided with a third temperature controller 307, and the third temperature controller 307 is connected through a wire Connected to the fan 102 and the refrigeration compressor 202; the outlet f of the chiller evaporator 201 and the outlet of the third electromagnetic valve 306 and the inlet pipeline of the cold water tank 302, that is, the pipeline before the connection point of the third electromagnetic valve 306 is provided with a fourth temperature A controller 308, the fourth temperature controller 308 is connected to the refrigeration compressor 202 through wires;

The control method of a kind of air compressor suction pretreatment system of the present invention, specific content and method are:

When the ambient temperature is lower than the set temperature of the first temperature controller 404, the first electromagnetic valve 403 is opened, the closed cooling tower 100 and the water chiller 200 are not operated, and the temperature control of the intake air of the air compressor is not carried out;

When the ambient temperature was higher than the set temperature of the first temperature controller 404, the spray pump 101 and the blower fan 102 were turned on, and the closed cooling tower 100 started to work. At this time, when the water temperature of the closed cooling tower 100 outlet n was lower than the first When the set temperature of the three temperature controllers 307, the chiller 200 does not work, the third electromagnetic valve 306 is opened, and the fan 102 speed of the closed cooling tower 100 is controlled by the third temperature controller 307, so that the outlet of the closed cooling tower 100 The water temperature of n is stable at the control temperature; when the water temperature of closed cooling tower 100 outlet n is higher than the set temperature of the third temperature controller 307 plus one degree Celsius, the refrigeration compressor 202 and the second electromagnetic valve 305 are opened, and the third solenoid valve is closed. Electromagnetic valve 306, water chiller 200 starts to work, and the frequency of refrigeration compressor 202 is controlled by the fourth temperature controller 308, so that the water temperature of the outlet f of the evaporator 201 of the chiller is stabilized at the control temperature; the second temperature controller 405 controls the electric three Through the valve opening of the regulating valve 304, the air temperature at the outlet b of the heat exchanger 301 is stabilized at the control temperature;

Further preferably, the frequency of the fan 102 is proportional to the temperature of the outlet water at the outlet n of the closed cooling tower 100;

Further preferably, the valve opening at the outlet k of the three-way regulating valve 304 is proportional to the air temperature at the outlet b of the heat exchanger 301;

Further preferably, the frequency of the refrigeration compressor 202 is proportional to the outlet water temperature of the evaporator 201 outlet f of the chiller.

Compared with the prior art, the technical solution of the present invention has the following technical effects:

The invention prepares cold water through the combined operation of the closed cooling tower and the water chiller, and uses the cold water to perform cooling pretreatment on the ambient air, which improves the operating efficiency of the air compressor, reduces the exhaust temperature of the air compressor, and prevents When the viscosity of the lubricating oil decreases and the air compressor malfunctions. Through the precise control of multiple temperature controllers, the stable operation of the system is ensured, and at the same time, the suction temperature of the air compressor is accurately controlled at the set temperature to avoid the air sucked by the air compressor with liquid droplets, which will cause the air compressor to run incorrectly. Good, in case of failure. The combination of closed cooling tower and water chiller can make good use of the natural cold source on the one hand, and reduce the load of the chiller through the pretreatment of the closed cooling tower, which can reduce the initial investment and operation cost of the system. Combined with the control strategy of the invented system, the most energy-saving air intake temperature control operation scheme can be selected according to the change of the ambient temperature, and the payback period of equipment investment can be reduced.

Description of drawings

Fig. 1 is a system configuration diagram of one of the embodiments of the present invention;

Fig. 2 is a system configuration diagram of the second embodiment of the present invention;

In the figure: 100 is a closed cooling tower, 101 is a spray pump, 102 is a fan, 103 is a water eliminator, 104 is a spray outlet, 105 is a heat exchange coil, 106 is an air inlet grille, and 200 is a water chiller , 201 is the chiller evaporator, 202 is the refrigeration compressor, 203 is the chiller condenser, 204 is the throttle valve, 205 is the cooling water pump, 206 is the cooling tower, 301 is the heat exchanger, 302 is the cold water tank, 303 is Circulating water pump, 304 is the electric three-way regulating valve, 305 is the second solenoid valve, 306 is the third solenoid valve, 307 is the third temperature controller, 308 is the fourth temperature controller, 401 is the filter, 402 is the air pressure Machine, 403 is the first electromagnetic valve, 404 is the first temperature controller, 405 is the second temperature controller.

Detailed ways

In order to make the purpose and technical solutions of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings of the embodiments of the present invention. Apparently, the described embodiments are some, not all, embodiments of the present invention. Based on the described embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

As shown in Figure 1, an air compressor suction pretreatment system includes a water chiller 200, a closed cooling tower 100, a heat exchanger 301, a cold water tank 302, a circulating water pump 303, an electric three-way regulating valve 304, and a filter 401, air compressor 402; closed cooling tower 100 is composed of spray pump 101, fan 102, water collector 103, spray outlet 104, heat exchange coil 105, air inlet grille 106; chiller 200 is composed of chiller Evaporator 201, refrigeration compressor 202, chiller condenser 203, throttle valve 204;

One outlet of the filter 401 is connected to the pipeline between the outlet b of the heat exchanger 301 and the suction port of the air compressor 402 through the first solenoid valve 403, and the other outlet is connected to the inlet a of the heat exchanger 301 by a pipeline for heat exchange. The outlet b of the device 301 is connected to the suction port of the air compressor 402 by a pipeline; the outlet d of the heat exchanger 301 is connected to the inlet m of the closed cooling tower 100 by a pipeline, and the outlet n of the closed cooling tower 100 is connected to The inlet e of the chiller evaporator 201 is connected to the pipeline between the outlet f of the chiller evaporator 201 and the cold water tank 302 through the third electromagnetic valve 306, and the outlet f of the chiller evaporator 201 is connected to the inlet of the cold water tank 302 by a pipeline , the outlet of the cold water tank 302 is connected to the inlet of the circulating water pump 303 by a pipeline, the outlet of the circulating water pump 303 is connected to the inlet i of the electric three-way regulating valve 304 by a pipeline, and the outlet k of the electric three-way regulating valve 304 is connected to the inlet c of the heat exchanger 301 by a pipeline. The outlet j of the electric three-way regulating valve 304 is connected to the pipeline between the outlet d of the heat exchanger 302 and the inlet m of the closed cooling tower 100 by a pipeline;

The outlet of the refrigeration compressor 202 is connected to the inlet of the chiller condenser 203 by a pipeline, the outlet of the condenser 203 of the chiller is connected to the inlet h of the evaporator 201 of the chiller through a throttle valve 204, and the outlet g of the evaporator 201 of the chiller is connected to The inlet of the refrigeration compressor 202; the inside of the closed cooling tower 100 is provided with a fan 102, a water receiver 103, a spray port 104, a heat exchange coil 105, and an inlet grille 106 from top to bottom. The outlet of the solution at the bottom of 100 is connected to the inlet of the spray pump 101 by a pipeline, and the outlet of the spray pump 101 is connected to the spray port 104 on the top of the closed cooling tower 100 by a pipeline.

The chiller 200 is a frequency conversion medium temperature chiller, the energy efficiency of the medium temperature chiller is high, and the outlet water temperature of the evaporator 201 of the chiller is high, when the cold water exchanges heat with the ambient air, it can avoid condensation of moisture in the air and ensure the air pressure is high. Machine 402 aspirates without water droplets.

When the cooling load of the chiller 200 is below 70kW, as shown in Figure 1, the condenser 203 of the chiller adopts an air-cooled condenser; when the cooling load of the chiller 200 is above 70kW, as shown in Figure 2, the condenser 203 of the chiller adopts A water-cooled condenser is added with a cooling water system composed of a cooling water cooling pump 205 and a cooling tower 206.

The pipeline between the outlet of the filter 401 and the inlet a of the heat exchanger 301 is provided with a first temperature controller 404, and the first temperature controller 404 is connected to the spray pump 101 and the blower fan 102 through wires; the heat exchanger A second temperature controller 405 is provided on the pipeline before the connection point between the outlet b of 301 and the first electromagnetic valve 403 on the suction pipeline of the air compressor 402, so that only the air temperature at the outlet b of the heat exchanger 301 is precisely controlled to ensure In the case of refrigeration system operation, the air temperature at the outlet b of the heat exchanger 301 is stable at the set temperature, and the second temperature controller 405 is connected to the electric three-way regulating valve 304 through a wire; the outlet n of the closed cooling tower 100 is connected to the A third temperature controller 307 is arranged on the pipeline between the inlets of the second electromagnetic valve 305, and the third temperature controller 307 is connected to the blower fan 102 and the refrigeration compressor 202 by wires; 302 The fourth temperature controller 308 is installed on the pipeline before the connection point of the third solenoid valve 306 of the inlet pipeline, so that only the temperature of the cold water at the outlet f of the evaporator 201 of the chiller is accurately controlled to ensure that the chiller 200 is running. The temperature of the cold water at the outlet f of the unit evaporator 201 is stabilized at the set temperature, and the fourth temperature controller 308 is connected to the refrigeration compressor 202 through wires.

A control method of an air compressor suction pretreatment system of the present invention, specifically:

When the ambient temperature is lower than the 32°C set by the first temperature controller 404, the first electromagnetic valve 403 is opened, and the closed cooling tower 100 and the chiller 200 are not running at this time, and the temperature control of the intake air of the air compressor is not performed. After the ambient air passes through the filter 401 to filter impurities, it passes through the first solenoid valve 403 and then enters the air compressor 402 to perform the compression process;

When the ambient temperature is higher than the 32°C set by the first temperature controller 404, the first temperature controller 404 sends a signal to turn on the spray pump 101 and the blower fan 102, and the closed cooling tower 100 starts to work. When the water temperature at the outlet n of the cooling tower 100 is lower than the 23°C set by the third temperature controller 307, the chiller 200 does not work, the third electromagnetic valve 306 is opened, and the cold water cooled by the closed cooling tower 100 passes through the third electromagnetic valve. The valve 306 enters the cold water tank 302, and the fan 102 speed of the closed cooling tower 100 is controlled by the third temperature controller 307, so that the water temperature at the outlet n of the closed cooling tower 100 is stabilized at the set 23°C, and when the closed cooling When the outlet water temperature of the tower 100 reaches 23°C, the fan 102 operates at full load; when the water temperature at the outlet n of the closed cooling tower 100 reaches 24°C, it means that the ambient temperature is relatively high, and the fan 102 cannot reduce the water temperature to 23°C, at this time, it is necessary to turn on the chiller 200, supplement the cooling load of the air compressor 402 with insufficient air suction cooling, turn on the refrigeration compressor 202 and the second solenoid valve 305, close the third solenoid valve 306, and the chiller 200 starts to work. The cold water cooled by the closed cooling tower 100 enters the evaporator 201 of the chiller through the second solenoid valve 305 to exchange heat with the refrigerant, and enters the cold water tank 302 after the temperature is further lowered, and the frequency of the refrigeration compressor 202 is controlled by the fourth temperature controller 308 , so that the water temperature at the outlet f of the chiller evaporator 201 is stabilized at 18°C; the valve opening of the electric three-way regulating valve 304 is controlled by the second temperature controller 405, so that the air temperature at the outlet b of the heat exchanger 301 is stabilized at 26°C.

The frequency of the fan 102 is proportional to the temperature of the outlet water at the outlet n of the closed cooling tower 100. When the temperature of the outlet water at the outlet n of the closed cooling tower 100 increases, the frequency of the fan 102 is increased to enhance the exchange of spray water and circulating water. heat, thereby reducing the outlet water temperature of the fluid cooling tower 100;

The valve opening at the outlet k of the electric three-way regulating valve 304 is proportional to the air temperature at the outlet b of the heat exchanger 301. When the air temperature at the outlet b of the heat exchanger 301 rises, the electric three-way regulating valve will be increased The opening of the valve at the outlet k of 304 is reduced to reduce the opening of the valve at the outlet j of the electric three-way regulating valve to increase the flow of cold water entering the heat exchanger 301, thereby reducing the air temperature at the outlet b of the heat exchanger 301;

The frequency of the refrigeration compressor 202 is directly proportional to the outlet water temperature of the chiller evaporator 201 outlet f. When the outlet water temperature of the chiller evaporator 201 outlet f rises, the frequency of the refrigeration compressor 202 is increased to increase the refrigerant and circulation. The heat exchange of water reduces the outlet water temperature of the outlet f of the chiller 201.

Although the present invention is disclosed above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, so the protection scope of the present invention should be based on the scope defined in the claims.

Claims (6)

1. A control method of an air compressor suction pretreatment system, based on a system comprising a water chiller (200), a closed cooling tower (100), a heat exchanger (301), a cold water tank (302), a circulating water pump ( 303), electric three-way regulating valve (304), filter (401), air compressor (402); closed cooling tower (100) is composed of spray pump (101), fan (102), water eliminator (103 ), spray outlet (104), heat exchange coil (105), air intake grille (106); the water chiller (200) is composed of chiller evaporator (201), refrigeration compressor (202), chiller condensing device (203), throttle valve (204); The outlet of the filter (401) is connected to the pipeline between the outlet b of the heat exchanger (301) and the suction port of the air compressor (402) through the first electromagnetic valve (403), and the other way is connected to the air compressor (402) through a pipeline. The inlet a of the heat exchanger (301) and the outlet b of the heat exchanger (301) are connected to the suction port of the air compressor (402) by pipes; the outlet d of the heat exchanger (301) is connected to the inlet of the closed cooling tower (100) by pipes m, the outlet n of the closed cooling tower (100) is connected to the inlet e of the chiller evaporator (201) through the second solenoid valve (305), and the other is connected to the chiller evaporator (201) through the third solenoid valve (306). ) outlet f and the cold water tank (302), the outlet f of the chiller evaporator (201) is connected to the inlet of the cold water tank (302) by a pipeline, and the outlet of the cold water tank (302) is connected to the circulating water pump (303) by a pipeline The inlet and the outlet of the circulating water pump (303) are connected to the inlet i of the electric three-way regulating valve (304) by pipes, the outlet k of the electric three-way regulating valve (304) is connected to the inlet c of the heat exchanger (301) by pipes, and the electric three-way regulating The outlet j of the valve (304) is connected to the pipeline between the outlet d of the heat exchanger (302) and the inlet m of the closed cooling tower (100) by a pipeline; The outlet of the refrigeration compressor (202) is connected to the inlet of the chiller condenser (203) by a pipeline, and the outlet of the chiller condenser (203) is connected to the inlet h of the chiller evaporator (201) through a throttle valve (204). The outlet g of the unit evaporator (201) is connected to the inlet of the refrigeration compressor (202) by a pipeline; the inside of the closed cooling tower (100) is sequentially provided with a fan (102), a water eliminator (103), a sprinkler Sprinkler (104), heat exchange coil (105), air intake grille (106), the outlet of the solution at the bottom of the closed cooling tower (100) is connected to the inlet of the spray pump (101) by pipes, and the spray pump (101) ) outlet is connected to the spray port (104) on the top of the fluid cooling tower (100) by a pipeline; The pipeline between the outlet of the filter (401) and the inlet a of the heat exchanger (301) is provided with a first temperature controller (404), and the first temperature controller (404) is connected to the spray pump (101 ) and fan (102); the pipeline before the connection point of the outlet b of the heat exchanger (301) and the first electromagnetic valve (403) on the suction pipeline of the air compressor (402) is provided with a second temperature controller ( 405), the second temperature controller (405) is connected to the electric three-way regulating valve (304) by wires; There is a third temperature controller (307), and the third temperature controller (307) is connected to the blower fan (102) and the refrigeration compressor (202) by wires; ) A fourth temperature controller (308) is arranged on the pipeline before the connection point of the third electromagnetic valve (306) of the inlet pipeline, and the fourth temperature controller (308) is connected to the refrigeration compressor (202) through wires; It is characterized in that the content and method of the control method are: When the ambient temperature is lower than the set temperature of the first temperature controller (404), the first electromagnetic valve (403) is opened, the closed cooling tower (100) and the chiller (200) are not operated, and the air compressor is not operated. gas for temperature control; When the ambient temperature was higher than the set temperature of the first temperature controller (404), the spray pump (101) and fan (102) were turned on, and the closed cooling tower (100) started to work. At this time, when the closed cooling tower (100) When the water temperature at the outlet n is lower than the set temperature of the third temperature controller (307), the water chiller (200) does not work, the third electromagnetic valve (306) is opened, and the third temperature controller (307) ) to control the fan (102) rotating speed of the closed cooling tower (100), so that the water temperature of the closed cooling tower (100) outlet n is stabilized at the control temperature; when the water temperature of the closed cooling tower (100) outlet n is higher than the third temperature When the set temperature of the controller (307) is increased by one degree Celsius, the refrigeration compressor (202) and the second solenoid valve (305) are opened, the third solenoid valve (306) is closed, and the water chiller (200) starts working, and the Four temperature controllers (308) control the frequency of the refrigeration compressor (202), so that the water temperature at the outlet f of the chiller evaporator (201) is stabilized at the control temperature; the electric three-way regulating valve (304) is controlled by the second temperature controller (405) ) valve opening, so that the air temperature at the outlet b of the heat exchanger (301) is stabilized at the control temperature. 2. The control method of an air compressor suction pretreatment system according to claim 1, characterized in that, the water chiller (200) is a variable frequency medium temperature chiller. 3. The control method of a kind of air compressor suction pretreatment system according to claim 1, characterized in that, when the cooling load of the water chiller (200) is below 70kW, the condenser (203) of the chiller adopts an air-cooled type Condenser, when the cooling load of the chiller (200) is more than 70kW, the condenser of the chiller (203) adopts a water-cooled condenser. 4. The control method of a kind of air compressor suction pretreatment system according to claim 1, is characterized in that, the outlet water temperature of described blower fan (102) frequency and closed cooling tower (100) outlet n is proportional . 5. The control method of a kind of air compressor suction pretreatment system according to claim 1, characterized in that, the valve opening at the outlet k of the electric three-way regulating valve (304) is the same as that of the heat exchanger (301) The air temperature at outlet b is directly proportional. 6. The control method of a kind of air compressor suction pretreatment system according to claim 1, characterized in that, the frequency of the refrigeration compressor (202) is proportional to the temperature of the outlet water at the outlet f of the evaporator (201) of the chiller Proportional relationship.

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