CN105241115A - Steam compressing-jet coupling refrigeration circulating device and method - Google Patents

Abstract

The invention discloses a steam compressing-jet coupling refrigeration circulating device and method. According to the steam compressing-jet coupling refrigeration circulating device and method, heat is released by means of exhaust gas of a refrigeration compressor. The steam compressing-jet coupling refrigeration circulating device comprises a compressor, a generator, a condenser, a throttling valve, a gas-liquid separator, an evaporator, an ejector, a liquid booster pump, a liquid level controller, an electromagnetic valve, a pressure sensor and the like. According to the circulating system, a condensed saturated liquid refrigerant delivered into the generator through the booster pump is heated by means of superheated steam coming out of an exhaust port of the refrigeration compressor, saturated gas under the generation pressure is generated, and flash evaporation gas separated out by the gas-liquid separator after the saturated gas is used ejecting and throttling is used as working steam of the ejector; in this way, the situation that the flash evaporation gas enters the evaporator, and consequentially the limited heat exchange area of the evaporator cannot be well used is avoided, the gas transmitting amount of the compressor is definitely reduced on the premise that the refrigerating capacity is not changed, and thus power consumption of the compressor is reduced.

Description

Vapor compression-jet coupled refrigeration cycle device and method

technical field

The invention relates to a vapor compression-jet coupled refrigeration cycle system utilizing the exhaust sensible heat of a refrigeration compressor, which can effectively improve the heat transfer coefficient of an evaporator, reduce the power consumption of a compressor, and thereby increase the refrigeration coefficient.

Background technique

In the traditional compression refrigeration cycle, the liquid refrigerant cooled and condensed by the condenser will flash out gaseous refrigerant when throttling, and this part of gaseous refrigerant will not only not generate cooling capacity in the evaporator after entering the evaporator, but will also occupy The heat transfer area of the evaporator affects the evaporation of the liquid refrigerant, thereby reducing the heat transfer efficiency and cooling capacity of the evaporator. At the same time, this part of the low-pressure gas that does not produce cooling capacity will be sucked into the compressor, increasing the power consumption of the compressor.

In the present invention, the exhaust sensible heat of the compressor is used to realize the exhaust of the refrigeration compressor, and the indirect heating and gasification of the saturated liquid refrigerant pressurized by the liquid booster pump to the generation pressure in the generator produces a higher pressure gas, which is used as The working steam of the ejector used for the flash gas separated by the gas-liquid separator after injection throttling prevents the flash gas from entering the evaporator so that the limited heat exchange area of the evaporator cannot be well utilized. At the same time, it can be obtained Under the premise of the same cooling capacity, the air delivery capacity of the compressor is reduced, and the power consumption of the compressor is reduced. A vapor compression-injection coupled refrigeration cycle utilizing the sensible heat of compressor discharge is realized.

Contents of the invention

Technical problem: the object of the present invention is to address the deficiencies in the prior art, and propose a vapor compression-injection coupled refrigeration cycle device and method that utilizes the sensible heat of the exhaust of the refrigeration compressor. Combined with the advantages of simple structure, low cost, no moving parts, reliable operation, and suitable for use in any flow pattern including two-phase flow, the gaseous refrigerant flashed by throttling does not enter the evaporator and occupy the exchange rate. The heat area affects the heat transfer coefficient, and is not sucked by the compressor to increase the power consumption of the compressor. The refrigeration coefficient of the system is effectively improved without increasing the complexity of the system.

Technical content: A vapor compression-jet coupled refrigeration cycle device of the present invention is: the output end of the compressor is connected to the input end of the heat exchange tube in the steam generator, and the output end of the heat exchange tube in the steam generator is connected to the condenser The input end and the output end of the condenser are divided into two paths, the first path is connected to the input end of the gas-liquid separator through the throttle valve, and the second path is connected to the input end of the steam generator through the liquid booster pump; the liquid of the gas-liquid separator The output end is connected to the input end of the compressor through the evaporator; the gas output end of the gas-liquid separator is divided into two paths, the first path is connected to the first input end of the injector through the first solenoid valve, and the second path is connected to the first input end of the injector through the second solenoid valve. The input end of the compressor; the gas output end of the steam generator is connected to the second input end of the ejector through the third electromagnetic valve, and the output end of the ejector is connected to the input end of the condenser.

The refrigeration cycle method of the vapor compression-injection coupling refrigeration cycle device of the present invention is: the method utilizes the vapor compression injection coupling refrigeration cycle of the sensible heat exhausted by the refrigeration compressor, and realizes the exhaust of the refrigeration compressor by controlling the opening and closing of the electromagnetic valve. The indirect heating gasification in the generator is pressurized by the liquid booster pump to the saturated liquid refrigerant under the pressure, and the saturated gas under the pressure is produced, which is used as the flash gas separated by the gas-liquid separator after ejector throttling Working steam for the ejector. It prevents the flash gas from entering the evaporator, so that the limited heat exchange area of the evaporator cannot be well utilized. At the same time, under the premise of the same cooling capacity, the air delivery volume of the compressor can be reduced, and the power consumption of the compressor can be reduced.

The method of using the vapor compression ejection coupled refrigeration cycle with the exhaust sensible heat of the refrigeration compressor is as follows: the saturated liquid refrigerant condensed by the condenser is divided into two paths, one path is throttled by the throttle valve and enters the gas-liquid separator, and the saturated liquid refrigerant after separation Enter the evaporator, absorb the heat of the object to be cooled in the evaporator and vaporize (state point a), be sucked by the refrigerant into the compressor, and be compressed into a high-temperature and high-pressure gas (state point b) and enter the generator to cool down (state point c) Then enter the condenser to condense; the other way passes through the liquid booster pump to pressurize into the generator, and control the start and stop of the booster pump through the liquid level controller to achieve the purpose of controlling the liquid level in the generator;

At the start-up stage of the system, since the liquid refrigerant in the generator (state point h) is heated and vaporized by the superheated steam (state point b) discharged from the compressor, it takes a certain amount of time to reach the working pressure of the ejector, so temporarily close the third solenoid valve . At this time, the ejector cannot work because there is no working steam, so the first solenoid valve should be closed, and the second solenoid valve should be opened, so that the flash gas (state point g) separated by the gas-liquid separator is directly sucked into the compressor;

When the pressure difference between the generator and the condenser reaches 0.3MPa, close the second solenoid valve, open the first solenoid valve and the third solenoid valve, and the injector starts to work. The flash gas refrigerant (state point g) from the gas-liquid separator enters the condenser to condense after being injected by the ejector to increase the pressure (m state point).

Beneficial effects: the system uses the superheated steam from the exhaust port of the refrigeration compressor to heat the condensed saturated liquid refrigerant sent by the booster pump in the gasification generator to generate higher pressure gas, which is used as an ejection section The working steam of the flash gas separated by the gas-liquid separator after flowing. Since the flash gas generated after throttling by the throttle valve is separated and introduced into the condenser by the ejector, this not only prevents the flash gas from entering the evaporator, so that the limited heat exchange area of the evaporator cannot be well utilized, but at the same time , under the premise of the same cooling capacity, the air delivery capacity of the compressor must be reduced, reducing the power consumption of the compressor; if the air delivery volume of the compressor remains unchanged, there is no flash gas in the compressor air delivery , the refrigeration capacity of the evaporator will be improved. Preliminary estimates can be obtained: if the flash gas volume accounts for 10% of the gas delivery capacity of the compressor, the refrigerating cycle system of the invention will increase the refrigerating capacity by 10% compared with the original system.

Description of drawings

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

Figure 1 is a flow chart of a vapor compression-injection coupled refrigeration cycle system utilizing sensible heat exhausted by a refrigeration compressor.

Among them: compressor 1, generator 2, condenser 3, throttle valve 4, gas-liquid separator 5, evaporator 6, ejector 7, liquid booster pump 8, liquid level controller 9, first solenoid valve 10. The second solenoid valve 11, the third solenoid valve 12, the first pressure sensor 13, and the second pressure sensor 14; a, b, c, d, e, f, g, h, i, j, k, m are each status point.

Fig. 2 is a vapor compression-jet coupled refrigeration system cycle P-h diagram utilizing sensible heat exhausted by a refrigeration compressor.

detailed description

Compared with the ordinary refrigeration system, a vapor compression-jet coupled refrigeration cycle device utilizing the exhaust sensible heat of the refrigeration compressor of the present invention increases:

A gas-liquid separator for separating the flashed gaseous refrigerant after throttling;

A booster pump for boosting the pressure of the condensed liquid refrigerant;

A liquid level controller for sensing the liquid level of the generator and controlling the start and stop of the booster pump;

A steam generator set up to use the sensible heat of the exhaust of the compressor to generate higher pressure working steam for the operation of the ejector;

Ejectors for injecting throttling flashed gaseous refrigerant;

Several solenoid valves for switching processes and controlling flow;

Several pressure transducers are used to measure the pressure of the container.

This system can effectively improve the heat transfer coefficient of the evaporator, and effectively reduce the power consumption of the compressor under the premise of constant cooling capacity, thus significantly improving the system cooling coefficient

Its structure is:

The output end of the compressor 1 is connected to the input end of the heat exchange tube in the steam generator 2, the output end of the heat exchange tube in the steam generator 2 is connected to the input end of the condenser 3, and the output end of the condenser 3 is divided into two paths, the first One path is connected to the input end of the gas-liquid separator 5 through the throttle valve 4, and the second path is connected to the input end of the steam generator 2 through the liquid booster pump 8; the liquid output end of the gas-liquid separator 5 is connected to the compressor through the evaporator 6 The input end of the machine 1; the gas output end of the gas-liquid separator 5 is divided into two paths, the first path is connected to the first input end of the injector 7 through the first solenoid valve 10, and the second path is connected to the compressor through the second solenoid valve 11 1; the gas output of the steam generator 2 is connected to the second input of the injector 7 through the third electromagnetic valve 12, and the output of the injector 7 is the input of the condenser 3.

The method is:

The saturated liquid refrigerant after cooling and condensing by the condenser is divided into two paths, one path passes through the throttle valve to reduce temperature and pressure, and the other path passes through the liquid booster pump to pressurize into the generator, and the liquid level controller controls the refrigerant according to the liquid level of the generator. The booster pump starts and stops to achieve the purpose of controlling the liquid level of the generator.

In the system start-up stage, since the saturated liquid refrigerant (state point h) pressurized by the liquid booster pump in the generator to the generation pressure is heated and gasified to the generation pressure by the superheated steam (state point b) coming out of the compressor discharge port It takes a certain amount of time for the saturated gas to be lowered, so temporarily close the third solenoid valve. At this time, the ejector cannot work because there is no working steam, so the first solenoid valve should be closed, and the second solenoid valve should be opened, so that the flash gas (state point g) separated by the gas-liquid separator is directly sucked into the compressor instead of After passing through the evaporator, the flash gas is prevented from entering the evaporator, so that the limited heat transfer area of the evaporator cannot be well utilized and the heat transfer coefficient is reduced.

At this stage, the saturated liquid refrigerant (state point h) charged by the liquid booster pump to the generation pressure in the generator is being heated and vaporized by the superheated steam (state point b) coming out of the exhaust port of the compressor. When the pressure difference between the generator and the condenser reaches 0.3MPa, close the second solenoid valve 2, and open the first solenoid valve and the third solenoid valve. Due to the closing of the second solenoid valve and the opening of the first solenoid valve, the flash gas refrigerant (state point g) coming out of the gas-liquid separator will not be sucked into the compressor, but will be injected to increase the pressure through the ejector To state point m, the pressure at state point m at this time is the condensation pressure (specific process: the working steam at state point i under the generation pressure first expands to state point j in the ejector expansion chamber, and at this time the refrigerant gas at state point g Inhaled into the receiving chamber, the two are mixed in the mixing chamber of the injector to form a state point k, and then the diffuser of the injector is boosted to a state point m). The c state point and the m state point enter the condenser to condense to the d state point, and then divide into two paths, one path is pressurized by the liquid booster pump and enters the generator, and the other path enters the throttling valve to throttle to the e state point. The flash gas (g state point) is separated by the gas-liquid separator and injected into the condenser by the ejector for cooling. At this time, only liquid refrigerant enters the evaporator for evaporation and refrigeration (state point f), so the effective heat transfer area and heat transfer coefficient of the evaporator will be improved. State point f The liquid refrigerant gasifies and absorbs heat in the evaporator to complete cooling and becomes a saturated gas (state point a), which is sucked by the compressor and compressed into a high-temperature and high-pressure gas (state point b), which releases sensible heat when passing through the generator. After falling to state point c, it enters the condenser to condense to state point d. So far, the vapor compression-injection coupled refrigeration cycle using the sensible heat of the refrigeration compressor exhaust has been completed.

Claims (3)

1. both vapor compression-injection Combined Refrigeration Cycle device, it is characterized in that: the input going out heat-exchange tube in termination steam generator (2) of compressor (1), the input of the output termination condenser (3) of heat-exchange tube in this steam generator (2), the output of condenser (3) divides two-way, the first via connects the input of gas-liquid separator (5) by choke valve (4), and the second tunnel connects the input of steam generator (2) by liquid booster pump (8); What the fluid output port of gas-liquid separator (5) connect compressor (1) by evaporimeter (6) enters end; The gas output end of gas-liquid separator (5) divides two-way, the first via connects the first input end of injector (7) by the first magnetic valve (10), and what the second tunnel connect compressor (1) by the second magnetic valve (11) enters end; The gas output end of steam generator (2) connects the second input of injector (7), the input of the output condenser (3) of injector (7) by the 3rd magnetic valve (12).

2. the refrigerating and circulating method of both vapor compression as claimed in claim 1-injection Combined Refrigeration Cycle device, it is characterized in that: the both vapor compression that the method utilizes refrigeration compressor to be vented sensible heat sprays Combined Refrigeration Cycle, realize refrigeration compressor exhaust indirect heating and gasifying in generator by the keying of Controlling solenoid valve and be pressurized to the saturated liquid cold-producing medium occurred under pressure by liquid booster pump, produce the saturated gas occurred under pressure, as after injection throttling through the working steam of the flash gas of gas-liquid separator separates injector used.

3. the refrigerating and circulating method of both vapor compression-injection Combined Refrigeration Cycle device as claimed in claim 2, it is characterized in that the method utilizing refrigeration compressor to be vented the both vapor compression injection Combined Refrigeration Cycle of sensible heat is: the saturated liquid cold-producing medium after condenser condenses divides two-way, one tunnel enters gas-liquid separator through choke valve throttling, saturated liquid after separation enters evaporimeter, absorb in evaporimeter cooled object heat and after gasifying cooled dose sucked by compressor, enter condenser condenses again after the gas being compressed into HTHP enters generator cooling; Another road enters in generator through liquid booster pump supercharging, controls booster pump start and stop, reach the object of liquid level in control generator by fluid level controller;

At system start-up phase, because liquid refrigerant in generator is needed the regular hour by the superheated steam heating and gasifying that compressor is discharged, so temporarily first close the 3rd magnetic valve.Now injector cannot work because not having working steam, therefore will close the first magnetic valve, opens the second magnetic valve, and the flash gas after gas-liquid separator separates is directly sucked by compressor;

When generator and condenser pressure reduction reach 0.3MPa, close the second magnetic valve, open the first magnetic valve, the 3rd magnetic valve, injector is started working.After the boosting of injector injection, condenser condenses is entered from gas-liquid separator flash distillation gaseous refrigerant out.