Energy-saving refrigeration system and process

Abstract

The present invention discloses an energy-saving refrigeration system and process in the field of refrigeration technology, including: a generator, an evaporator, an absorber, an expansion valve, a solution pump and a pressure reducing valve. The refrigeration system also includes a generator and an ejector heat exchange component; the generator and an ejector heat exchange component includes an auxiliary generator, a first heat exchanger, an ejector and a second heat exchanger. In the present application, an auxiliary generator is provided to replace the condenser in the original heat-driven refrigeration unit, so that the heat of the high-pressure gaseous refrigerant desorbed from the generator is recovered and utilized, and the consumption of public utility circulating water is reduced, thereby improving the COP of the unit and reducing energy consumption; in the present application, an ejector is provided to eject the low-pressure gaseous refrigerant coming out of the evaporator, so that it is pressurized to become a medium-pressure gaseous refrigerant, thereby improving the absorption efficiency of the absorber, thereby enhancing the refrigeration performance of the unit, and compared with adding a gas compressor to the unit, the energy consumption of the unit is greatly reduced.

Description

Technical Field

[0001] The present invention relates to the field of refrigeration technology, in particular to an energy-saving refrigeration system and process. Background Art

[0002] like Figure 2 As shown in the figure, the heat-driven refrigeration unit uses low-grade waste heat to drive the thermal working medium and performs refrigeration through the phase change of the working medium (such as ammonia). The main equipment includes a generator 1, a condenser 2, an evaporator 3, an absorber 4, a solution pump 6, etc. Figure 2 As shown, the low-grade waste heat is used to heat the generator 1, and the mixed solution (referred to as rich liquid) with a certain concentration of refrigerant is delivered from the absorber 4 by the solution pump 6, so that most of the low-boiling-point refrigerant in the rich solution is desorbed, and becomes a high-pressure gaseous refrigerant and enters the condenser 2, and is condensed into a high-pressure liquid refrigerant by the circulating water. The high-pressure liquid refrigerant is decompressed into a low-pressure liquid refrigerant through the expansion valve 5, and the low-pressure liquid refrigerant enters the evaporator 3, absorbs the heat of the medium (coolant) to be cooled, and vaporizes into a low-pressure gaseous refrigerant, and the low-pressure gaseous refrigerant enters the absorber 4. The high-pressure lean liquid remaining in the generator 1 after the generation process is decompressed into a low-pressure lean liquid through the pressure reducing valve, enters the absorber, and is mixed and absorbed with the low-pressure gaseous refrigerant coming out of the evaporator 3, and is restored to the original concentration to become a room-temperature rich liquid. The room-temperature rich liquid is pressurized by the solution pump 6 and sent to the generator 1 to continue circulating. The circulating water is first used to cool the solution in the absorber 4, and then used to cool the condenser 2.

[0003] The high-pressure gaseous refrigerant desorbed from the generator 1 has a high heat content and is condensed into a high-pressure liquid refrigerant by circulating water in the condenser. The heat of the liquid refrigerant is taken away by the circulating water, resulting in part of the heat being wasted and increasing the consumption of the utility circulating water.

[0004] In addition, as one of the core equipment of the unit, the refrigeration efficiency of the unit is proportional to the absorption efficiency of the absorber 4. For the absorber 4, the higher the absorption pressure (that is, the higher the pressure of the incoming low-pressure gaseous refrigerant), the higher the absorption efficiency; the lower the refrigeration temperature, the lower the evaporation pressure, that is, the lower the absorption pressure; if a compressor is set between the evaporator 3 and the absorber 4, the low-pressure gaseous refrigerant coming out of the evaporator 3 is introduced into the compressor, and then sent to the absorber 4 after pressurization, the absorption pressure can be increased, but for gas compression, the energy consumption of the compressor is extremely high. Summary of the invention

[0005] The object of the present invention is to provide an energy-saving refrigeration system and process to solve the problem proposed in the above background technology that the high-pressure gaseous refrigerant desorbed from the generator has a high heat content and is condensed into a high-pressure liquid refrigerant by circulating water in the condenser, and its heat is carried away by the circulating water, resulting in part of the heat being wasted and increasing the consumption of circulating water for public works.

[0006] To achieve the above object, the present invention provides the following technical solutions: an energy-saving refrigeration system, comprising: a generator, an evaporator, an absorber, an expansion valve, a solution pump and a pressure reducing valve, the refrigeration system also comprising a generator and an ejector heat exchange component;

[0007] The generator-ejector heat exchange component includes an auxiliary generator, a first heat exchanger, an ejector and a second heat exchanger. The auxiliary generator uses the rich liquid discharged from the absorber to recover the heat of the high-pressure and high-temperature gaseous refrigerant discharged from the generator. The ejector uses the gaseous refrigerant generated by the rich liquid under the action of recovered heat to pressurize the gaseous refrigerant discharged from the evaporator. The first heat exchanger and the second heat exchanger are used to heat the rich liquid entering the generator. The first heat exchanger and the second heat exchanger are also used to cool the lean liquid and gaseous refrigerant entering the absorber.

[0008] Preferably, the secondary rich liquid outlet of the sub-generator is connected to the secondary rich liquid inlet of the second heat exchanger, the rich liquid inlet of the sub-generator is connected to the rich liquid outlet of the first heat exchanger, the gaseous refrigerant outlet of the sub-generator is connected to the gaseous refrigerant inlet of the first heat exchanger, and the gaseous refrigerant outlet of the first heat exchanger is connected to the ejector.

[0009] Preferably, the gaseous refrigerant inlet of the sub-generator is connected to the gaseous refrigerant outlet of the generator, the liquid refrigerant outlet of the sub-generator is connected to the expansion valve, the rich liquid inlet of the first heat exchanger is connected to the solution pump, the ejector is connected to the gaseous refrigerant outlet of the evaporator, the secondary rich liquid outlet of the second heat exchanger is connected to the secondary rich liquid inlet of the generator, and the lean liquid inlet and outlet of the second heat exchanger are respectively connected to the lean liquid outlet and the pressure reducing valve of the generator.

[0010] Preferably, the auxiliary generator, the first heat exchanger, the ejector and the second heat exchanger are integrated into a composite generator-ejector heat exchanger, and the composite generator-ejector heat exchanger comprises a tube-sheet heat exchanger, a heat exchanger and an ejector;

[0011] The tube-sheet heat exchanger comprises a shell and two tube-box barrel sections respectively arranged at both ends of the shell. A first heat exchange tube connecting the two tube-box barrel sections is arranged in the shell. A partition plate is arranged in the tube-sheet heat exchanger. The partition plate divides the inner cavity of the tube-sheet heat exchanger into a preheating cavity and a generating cavity isolated from each other. The preheating cavity and the generating cavity both comprise a shell, a tube-box barrel section and a first heat exchange tube.

[0012] Preferably, the two tube box sections of the preheating chamber are respectively provided with a high-pressure and high-temperature lean liquid inlet and a high-pressure and normal-temperature lean liquid outlet, and the shell of the preheating chamber is provided with a high-pressure secondary rich liquid outlet;

[0013] The two pipe box cylinder sections of the generating chamber are respectively provided with a high-pressure liquid refrigerant outlet and a high-pressure and high-temperature gaseous refrigerant inlet, the shell of the generating chamber is provided with a high-pressure medium-temperature rich liquid inlet, and the shell of the generating chamber is provided with a connecting port for connecting with the shell of the preheating chamber.

[0014] Preferably, the partition plate comprises a first partition plate arranged in the shell and a second partition plate arranged in the tube box barrel section, and the first partition plate is penetrated by an opening, and the opening is a communicating port.

[0015] Preferably, the heat exchanger comprises a cylinder segment and two tube sheets respectively arranged at both ends of the inner cavity of the cylinder segment, a second heat exchange tube is arranged between the two tube sheets, one end of the cylinder segment is communicated with the shell of the generating cavity, the other end of the cylinder segment is provided with a conical shell, the cylinder segment is provided with a high-pressure normal-temperature rich liquid inlet and a high-pressure medium-temperature rich liquid outlet between the two tube sheets, and the high-pressure medium-temperature rich liquid outlet is communicated with the high-pressure medium-temperature rich liquid inlet;

[0016] The ejector comprises an air inlet chamber, a mixing chamber, a reducing pipe, a buffer pipe and a pressure diffuser pipe which are connected in sequence. A nozzle for communicating with the conical shell is arranged in the air inlet chamber.

[0017] Preferably, a first baffle for supporting the first heat exchange tube is provided in the shell of the preheating chamber and the generating chamber, and a second baffle for supporting the second heat exchange tube is provided in the cylinder section.

[0018] Preferably, an energy-saving refrigeration system process, using the above energy-saving refrigeration system, comprises the following steps:

[0019] S1: After the rich liquid is discharged from the absorber and transported by the solution pump and preheated by the first heat exchanger to become a high-pressure medium-temperature rich liquid, it enters the auxiliary generator and is heated by the high-pressure and high-temperature gaseous refrigerant discharged from the generator, desorbing the secondary high-pressure and high-temperature gaseous refrigerant. The high-pressure medium-temperature rich liquid then becomes a high-pressure secondary rich liquid. After the high-pressure and high-temperature gaseous refrigerant absorbs heat, it condenses itself into a high-pressure liquid refrigerant.

[0020] S2: The high-pressure liquid refrigerant enters the evaporator after being decompressed by the expansion valve, absorbs the heat of the refrigerant and vaporizes into a low-pressure gaseous refrigerant. The sub-high-pressure and high-temperature gaseous refrigerant desorbed from the auxiliary generator enters the first heat exchanger, preheats the high-pressure room-temperature rich liquid delivered by the solution pump, and becomes a sub-high-pressure room-temperature gaseous refrigerant;

[0021] S3: The sub-high-pressure normal-temperature gaseous refrigerant enters the ejector, pressurizes the low-pressure gaseous refrigerant discharged from the evaporator, and enters the absorber;

[0022] S4: The high-pressure secondary rich liquid discharged from the auxiliary generator enters the second heat exchanger, is preheated by the high-pressure and high-temperature lean liquid discharged from the generator, and then enters the generator for circulation. After the high-pressure and high-temperature lean liquid is cooled, it is reduced in pressure by the pressure reducing valve and enters the absorber, where it absorbs the medium-pressure gaseous refrigerant ejected from the ejector and becomes a low-pressure, room-temperature rich liquid for circulation.

[0023] Preferably, an energy-saving refrigeration system process, using the above energy-saving refrigeration system, comprises the following steps:

[0024] S1: The high-pressure and high-temperature gaseous refrigerant discharged from the generator enters the first heat exchange tube of the generator chamber, heats the high-pressure medium-temperature rich liquid preheated by the heat exchanger, desorbs the second-high-pressure and high-temperature gaseous refrigerant, and the high-pressure medium-temperature rich liquid becomes a high-pressure second-rich liquid. After the high-pressure and high-temperature gaseous refrigerant absorbs heat, it condenses itself into a high-pressure liquid refrigerant;

[0025] S2: The second high-pressure and high-temperature gaseous refrigerant enters the second heat exchange tube of the heat exchanger, preheats the rich liquid delivered by the solution pump, enters the ejector, pressurizes the low-pressure gaseous refrigerant discharged from the evaporator, and enters the absorber;

[0026] S3: The high-pressure secondary rich liquid enters the shell of the preheating chamber through the opening, preheats the high-pressure and high-temperature lean liquid flowing in the first heat exchange tube of the preheating chamber, and then goes to the generator to continue circulating. After the high-pressure and high-temperature lean liquid is cooled, it is reduced in pressure by the pressure reducing valve and enters the absorber, where it absorbs the medium-pressure gaseous refrigerant ejected by the ejector and becomes a low-pressure and room-temperature rich liquid for circulation.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] In the present application, by setting up a secondary generator to replace the condenser in the original heat-driven refrigeration unit, the heat of the high-pressure gaseous refrigerant desorbed from the generator is recovered and utilized, and the consumption of utility circulating water is reduced, thereby improving the COP of the unit and reducing energy consumption;

[0029] In the present application, an ejector is provided to eject the low-pressure gaseous refrigerant from the evaporator, so that the low-pressure gaseous refrigerant is pressurized to become a medium-pressure gaseous refrigerant, thereby improving the absorption efficiency of the absorber, thereby enhancing the refrigeration performance of the unit, and greatly reducing the energy consumption of the unit compared to adding a gas compressor to the unit;

[0030] In the present application, by setting the first heat exchanger and the second heat exchanger, the rich liquid entering the generator is preheated to reduce the input of the generator heat source, and the temperature of the lean liquid and gaseous refrigerant entering the absorber is reduced to improve the absorption efficiency, so as to achieve efficient utilization of the internal energy of the system, reduce energy consumption, and improve the COP of the unit;

[0031] In the present application, the auxiliary generator, the ejector, the first heat exchanger and the second heat exchanger are integrated into one device, which can reduce the cost of equipment and pipelines, greatly reduce the footprint of the unit, and facilitate the skid-mounting of the unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the energy-saving refrigeration system of the present invention;

[0033] Figure 2 It is a schematic diagram of a heat-driven refrigeration unit in the prior art;

[0034] Figure 3 It is a schematic diagram of the connection structure between the refrigeration system of the present invention and the composite type generating ejector heat exchanger;

[0035] Figure 4 It is a schematic cross-sectional structure diagram of the composite type generating and ejecting heat exchanger of the present invention;

[0036] Figure 5 For the present invention Figure 4 Schematic diagram of the cross-sectional structure along the BB plane.

[0037] In the figure: 1, generator; 2, condenser; 3, evaporator; 4, absorber; 5, expansion valve; 6, solution pump; 7, pressure reducing valve; 8, auxiliary generator; 9, first heat exchanger; 10, ejector; 101, air inlet chamber; 102, nozzle; 103, mixing chamber; 104, reducing pipe; 105, buffer pipe; 106, pressure expansion pipe; 11, second heat exchanger; 12, shell; 121, preheating chamber; 122, generating chamber; 13, tube box barrel section; 14, partition plate; 141, first partition plate; 142, second partition plate Plate; 15, first heat exchange tube; 16, opening; 17, first baffle; 18, high-pressure liquid refrigerant outlet; 19, high-pressure and high-temperature lean liquid inlet; 20, high-pressure and high-temperature gaseous refrigerant inlet; 21, high-pressure and normal-temperature lean liquid outlet; 22, high-pressure secondary rich liquid outlet; 23, high-pressure and medium-temperature rich liquid inlet; 24, heat exchanger; 241, cylinder section; 242, second heat exchange tube; 243, high-pressure and normal-temperature rich liquid inlet; 244, high-pressure and medium-temperature rich liquid outlet; 245, second baffle; 246, tube sheet; 247, conical shell. DETAILED DESCRIPTION

[0038] 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.

[0039] Example 1

[0040] See also Figure 1 An energy-saving refrigeration system includes: a generator 1, an evaporator 3, an absorber 4, an expansion valve 5, a solution pump 6 and a pressure reducing valve 7. The refrigeration system also includes a generator and an evaporator heat exchange component.

[0041] See also Figure 1 The ejector heat exchange assembly includes a secondary generator 8, a first heat exchanger 9, an ejector 10 and a second heat exchanger 11;

[0042] Among them, the secondary rich liquid outlet of the sub-generator 8 is connected to the secondary rich liquid inlet of the second heat exchanger 11, the rich liquid inlet of the sub-generator 8 is connected to the rich liquid outlet of the first heat exchanger 9, the gaseous refrigerant outlet of the sub-generator 8 is connected to the gaseous refrigerant inlet of the first heat exchanger 9, and the gaseous refrigerant outlet of the first heat exchanger 9 is connected to the ejector 10; the gaseous refrigerant inlet of the sub-generator 8 is connected to the gaseous refrigerant outlet of the generator 1, the liquid refrigerant outlet of the sub-generator 8 is connected to the expansion valve 5, the rich liquid inlet of the first heat exchanger 9 is connected to the solution pump 6, the inlet of the ejector 10 is connected to the gaseous refrigerant outlet of the evaporator 3, the outlet of the ejector 10 is connected to the gaseous refrigerant inlet of the absorber 4, the secondary rich liquid outlet of the second heat exchanger 11 is connected to the secondary rich liquid inlet of the generator 1, and the lean liquid inlet and outlet of the second heat exchanger 11 are respectively connected to the lean liquid outlet of the generator 1 and the pressure reducing valve 7.

[0043] It should be noted that the outlet of the expansion valve 5 is communicated with the liquid refrigerant inlet of the evaporator 3 , and the outlet of the pressure reducing valve 7 is communicated with the lean liquid inlet of the absorber 4 .

[0044] An energy-saving refrigeration system process comprises the following steps:

[0045] First, the heat source enters the generator 1, heats the rich liquid (rich liquid refers to high-pressure secondary rich liquid) inside the generator 1, desorbs the high-pressure and high-temperature gaseous refrigerant, and the rich liquid becomes a high-pressure and high-temperature lean liquid after the refrigerant is removed, and the used heat source is discharged from the generator 1;

[0046] Second, the low-pressure room-temperature rich liquid discharged from the absorber 4 is conveyed by the solution pump 6 to be pressurized into a high-pressure room-temperature rich liquid and enters the first heat exchanger 9 for preheating. After becoming a high-pressure medium-temperature rich liquid, it enters the auxiliary generator 8. The high-pressure and high-temperature gaseous refrigerant is introduced from the generator 1 into the auxiliary generator 8 as a heat source to heat the high-pressure medium-temperature rich liquid and desorb the secondary high-pressure and high-temperature gaseous refrigerant. The high-pressure medium-temperature rich liquid then becomes a high-pressure secondary rich liquid. After the high-pressure and high-temperature gaseous refrigerant absorbs heat, it condenses itself into a high-pressure liquid refrigerant.

[0047] Third, the high-pressure liquid refrigerant is decompressed by the expansion valve 5 and becomes a low-pressure liquid refrigerant, and enters the evaporator 3, absorbs the heat of the refrigerant in the evaporator 3 and vaporizes into a low-pressure gaseous refrigerant. The sub-high-pressure and high-temperature gaseous refrigerant desorbed from the auxiliary generator 8 enters the first heat exchanger 9, preheats the high-pressure room-temperature rich liquid delivered by the solution pump 6, and heats the high-pressure room-temperature rich liquid to become a high-pressure medium-temperature rich liquid, which absorbs heat and becomes a sub-high-pressure room-temperature gaseous refrigerant.

[0048] Fourth, the sub-high-pressure normal-temperature gaseous refrigerant enters the ejector 10, which acts as an ejection source to eject the low-pressure gaseous refrigerant from the evaporator 3, turning it into a medium-pressure gaseous refrigerant, and then enters the absorber 4 to be absorbed;

[0049] Fifth, the high-pressure secondary rich liquid discharged from the auxiliary generator 8 enters the second heat exchanger 11, is preheated by the high-pressure and high-temperature lean liquid discharged from the generator 1, and then enters the generator 1 for subsequent circulation. The high-pressure and high-temperature lean liquid is cooled to become a high-pressure normal-temperature lean liquid, and is reduced in pressure by the pressure reducing valve 7 to become a low-pressure normal-temperature lean liquid, and enters the absorber 4 to absorb the medium-pressure gaseous refrigerant ejected by the ejector 10, and is restored to its original concentration (the heat generated in this process is absorbed by the circulating water passed into the absorber 4), and becomes a low-pressure normal-temperature rich liquid. The low-pressure normal-temperature rich liquid is pressurized by the solution pump 6 to become a high-pressure normal-temperature rich liquid, and is sent to the first heat exchanger 9 to continue the subsequent circulation.

[0050] Example 2

[0051] As a further optimized solution of Example 1, please refer to Figure 3 and Figure 4 , the auxiliary generator 8, the first heat exchanger 9, the ejector 10 and the second heat exchanger 11 are integrated into a composite generator ejector heat exchanger (the generator ejector heat exchange components are integrated into one device); the composite generator ejector heat exchanger includes a tube-sheet heat exchanger, a heat exchanger 24 and an ejector 10;

[0052] See also Figure 4 and Figure 5The tube-sheet heat exchanger includes a shell 12 and two tube-box barrel sections 13, the two tube-box barrel sections 13 are respectively arranged at the two ends of the shell 12, a first heat exchange tube 15 is arranged in the inner cavity of the shell 12, the first heat exchange tube 15 connects the two tube-box barrel sections 13, a partition plate 14 is arranged in the inner cavity of the tube-sheet heat exchanger, the partition plate 14 divides the inner cavity of the tube-sheet heat exchanger into a preheating chamber 121 and a generating chamber 122 isolated from each other, the preheating chamber 121 is located below the generating chamber 122, the preheating chamber 121 and the generating chamber 122 both include the shell 12, the tube-box barrel section 13 and the first heat exchange tube 15.

[0053] See also Figure 4 The two tube box barrel sections 13 of the preheating chamber 121 are respectively provided with a high-pressure and high-temperature lean liquid inlet 19 and a high-pressure and normal-temperature lean liquid outlet 21, and the bottom wall of the shell 12 of the preheating chamber 121 is provided with a high-pressure secondary rich liquid outlet 22; the two tube box barrel sections 13 of the generating chamber 122 are respectively provided with a high-pressure liquid refrigerant outlet 18 and a high-pressure and high-temperature gaseous refrigerant inlet 20, and the top wall of the shell 12 of the generating chamber 122 is provided with a high-pressure and medium-temperature rich liquid inlet 23, and the shell 12 of the generating chamber 122 is provided with a connecting port, through which the shell 12 of the generating chamber 122 is connected with the shell 12 of the preheating chamber 121;

[0054] Among them, see Figure 4 The partition plate 14 includes a first partition plate 141 and two second partition plates 142. The first partition plate 141 is arranged in the inner cavity of the shell 12, dividing the shell 12 into two upper and lower parts. The two second partition plates 142 are respectively arranged in the inner cavities of the two pipe box barrel sections 13, dividing the inner cavity of the pipe box barrel section 13 into two upper and lower parts. An opening 16 is penetrated through the bottom of the first partition plate 141. The opening 16 is a connecting port. The opening 16 connects the shell 12 of the generating chamber 122 with the shell 12 of the preheating chamber 121.

[0055] See also Figure 4The heat exchanger 24 includes a cylinder section 241, which is vertically mounted on the top wall of the shell 12. The bottom end of the cylinder section 241 is connected to the shell 12 of the generating chamber 122. Tube sheets 246 are provided on both the upper and lower sides of the inner cavity of the cylinder section 241. A second heat exchange tube 242 is provided between the two tube sheets 246. A conical shell 247 is provided at the top of the cylinder section 241. The second heat exchange tube 242 connects the shell 12 of the generating chamber 122 with the conical shell 247. A high-pressure and normal-temperature rich liquid inlet 243 is provided at the top of the side wall of the cylinder section 241. The side wall of the cylinder section 241 A high-pressure medium-temperature rich liquid outlet 244 is provided at the bottom, a high-pressure normal-temperature rich liquid inlet 243 and a high-pressure medium-temperature rich liquid outlet 244 are located between two tube sheets 246, and the high-pressure medium-temperature rich liquid outlet 244 is connected to the high-pressure medium-temperature rich liquid inlet 23; the ejector 10 includes an air intake chamber 101, a mixing chamber 103, a reducing pipe 104, a buffer pipe 105 and a diffuser pipe 106 which are connected in sequence, a nozzle 102 is installed in the air intake chamber 101, the outlet of the nozzle 102 faces the mixing chamber 103, and the conical shell 247 is connected to the inlet of the nozzle 102 through a bend pipe.

[0056] See also Figure 3 and Figure 4 The high-pressure and high-temperature gaseous refrigerant inlet 20 of the generating chamber 122 is connected to the gaseous refrigerant outlet of the generator 1, the high-pressure and high-temperature liquid refrigerant outlet 18 of the generating chamber 122 is connected to the expansion valve 5, the high-pressure and normal-temperature rich liquid inlet 243 of the heat exchanger 24 is connected to the solution pump 6, the air inlet of the air inlet chamber 101 of the ejector 10 is connected to the gaseous refrigerant outlet of the evaporator 3, the air outlet of the diffuser 106 of the ejector 10 is connected to the gaseous refrigerant inlet of the absorber 4, the high-pressure secondary rich liquid outlet 22 of the preheating chamber 121 is connected to the secondary rich liquid inlet of the generator 1, the high-pressure and high-temperature lean liquid inlet 19 of the preheating chamber 121 is connected to the lean liquid outlet of the generator 1, and the high-pressure and normal-temperature lean liquid outlet 21 of the preheating chamber 121 is connected to the pressure reducing valve 7.

[0057] In this embodiment, as a further optimized solution, please refer to Figure 4The shells 12 of the preheating chamber 121 and the generating chamber 122 are both provided with a plurality of first baffles 17, the first baffles 17 are used to support the first heat exchange tube 15, and the plurality of first baffles 17 are sequentially distributed along the length extension direction of the first heat exchange tube 15, the plurality of first baffles 17 in the preheating chamber 121 are staggeredly installed on the upper and lower inner walls of the preheating chamber 121, and the plurality of first baffles 17 in the generating chamber 122 are staggeredly installed on the front and rear inner walls of the generating chamber 122, and a curved flow is formed between the plurality of first baffles 17. The passage is formed to extend the residence time of the high-pressure, medium-temperature rich liquid in the generating chamber 122, and also extend the residence time of the high-pressure secondary rich liquid in the preheating chamber 121; a plurality of second baffles 245 are provided in the inner cavity of the cylinder section 241, and the plurality of second baffles 245 are used to support the second heat exchange tube 242; the plurality of second baffles 245 are staggeredly installed on the inner walls on the left and right sides of the cylinder section 241, and a curved flow passage is formed between the plurality of second baffles 245, so that the contact time of the secondary high-pressure, high-temperature gaseous refrigerant with the second heat exchange tube 242 is increased.

[0058] It should be noted that, when the ejection heat exchange component is integrated into one device, the energy-saving refrigeration system process includes the following steps:

[0059] First, the high-pressure and high-temperature gaseous refrigerant discharged from the generator 1 enters the first heat exchange tube 15 of the generating chamber 122 through the high-pressure and high-temperature gaseous refrigerant inlet 20, and the solution pump 6 inputs the high-pressure normal-temperature rich liquid into the interior of the cylinder section 241 from the high-pressure and normal-temperature rich liquid inlet 243. After being preheated into a high-pressure medium-temperature rich liquid by the sub-high-pressure and high-temperature gaseous refrigerant flowing in the second heat exchange tube 242, it is discharged from the cylinder section 241 through the high-pressure medium-temperature rich liquid outlet 244, and then enters the shell 12 of the generating chamber 122 through the high-pressure medium-temperature rich liquid inlet 23, and is heated by the high-pressure and high-temperature gaseous refrigerant in the first heat exchange tube 15 of the generating chamber 122 to desorb the sub-high-pressure and high-temperature gaseous refrigerant, and the high-pressure medium-temperature rich liquid becomes a high-pressure sub-rich liquid. After the high-pressure and high-temperature gaseous refrigerant absorbs heat, it condenses itself into a high-pressure liquid refrigerant.

[0060] Second, the high-pressure liquid refrigerant is discharged from the high-pressure liquid refrigerant outlet 18 and is decompressed into a low-pressure liquid refrigerant by the expansion valve 5, and then enters the evaporator 3, absorbs the heat of the refrigerant and vaporizes into a low-pressure gaseous refrigerant, and the sub-high-pressure and high-temperature gaseous refrigerant rises and enters the second heat exchange tube 242 of the cylinder section 241, preheats the high-pressure room-temperature rich liquid delivered by the solution pump 6, and becomes a sub-high-pressure room-temperature gaseous refrigerant after absorbing heat. The sub-high-pressure room-temperature gaseous refrigerant is discharged from the second heat exchange tube 242, and enters the mixing chamber 103 through the conical shell 247 and the nozzle 102, and acts as an ejection source to eject the low-pressure gaseous refrigerant coming out of the evaporator 3 (the low-pressure gaseous refrigerant enters from the air inlet of the air inlet chamber 101, and then is introduced into the mixing chamber 103), so that it becomes a medium-pressure gaseous refrigerant (in this process, the gaseous refrigerant passes through the reducing tube 104, the buffer tube 105 and the pressure expander tube 106 in turn), and enters the absorber 4 to be absorbed;

[0061] Third, the high-pressure secondary rich liquid enters the shell 12 of the preheating chamber 121 through the opening 16, and the high-pressure and high-temperature lean liquid discharged from the generator 1 enters the first heat exchange tube 15 of the preheating chamber 121 through the high-pressure and high-temperature lean liquid inlet 19. After preheating the high-pressure secondary rich liquid, it flows out from the high-pressure secondary rich liquid outlet 22 and continues to circulate in the generator 1. The high-pressure and high-temperature lean liquid absorbs heat in the preheating chamber 121 and is cooled into a high-pressure normal-temperature lean liquid. It is discharged from the high-pressure normal-temperature lean liquid outlet 21, and is reduced in pressure by the pressure reducing valve 7 to become a low-pressure normal-temperature lean liquid. It enters the absorber 4, absorbs the medium-pressure gaseous refrigerant ejected by the ejector 10, and is restored to its original concentration to become a low-pressure normal-temperature rich liquid. The low-pressure normal-temperature rich liquid is pressurized by the solution pump 6 to become a high-pressure normal-temperature rich liquid, and is sent to the heat exchanger 24 to continue the subsequent circulation.

[0062] 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. An energy-saving refrigeration system, comprising: Generator (1), evaporator (3), absorber (4), expansion valve (5), solution pump (6) and pressure reducing valve (7), characterized in that: the refrigeration system also includes a generator and ejector heat exchange component; The generator-ejector heat exchange assembly comprises an auxiliary generator (8), a first heat exchanger (9), an ejector (10) and a second heat exchanger (11); the auxiliary generator (8) utilizes the rich liquid discharged from the absorber (4) to recover the heat of the high-pressure and high-temperature gaseous refrigerant discharged from the generator (1); the ejector (10) utilizes the rich liquid to generate gaseous refrigerant under the action of the recovered heat to pressurize the gaseous refrigerant discharged from the evaporator (3); the first heat exchanger (9) and the second heat exchanger (11) are used to heat the rich liquid entering the generator (1); and the first heat exchanger (9) and the second heat exchanger (11) are also used to cool the lean liquid and gaseous refrigerant entering the absorber (4).

2. An energy-saving refrigeration system according to claim 1, characterized in that: The secondary rich liquid outlet of the auxiliary generator (8) is connected to the secondary rich liquid inlet of the second heat exchanger (11), the rich liquid inlet of the auxiliary generator (8) is connected to the rich liquid outlet of the first heat exchanger (9), the gaseous refrigerant outlet of the auxiliary generator (8) is connected to the gaseous refrigerant inlet of the first heat exchanger (9), and the gaseous refrigerant outlet of the first heat exchanger (9) is connected to the ejector (10).

3. An energy-saving refrigeration system according to claim 2, characterized in that: The gaseous refrigerant inlet of the auxiliary generator (8) is connected to the gaseous refrigerant outlet of the generator (1), the liquid refrigerant outlet of the auxiliary generator (8) is connected to the expansion valve (5), the rich liquid inlet of the first heat exchanger (9) is connected to the solution pump (6), the ejector (10) is connected to the gaseous refrigerant outlet of the evaporator (3), the secondary rich liquid outlet of the second heat exchanger (11) is connected to the secondary rich liquid inlet of the generator (1), and the lean liquid inlet and outlet of the second heat exchanger (11) are respectively connected to the lean liquid outlet of the generator (1) and the pressure reducing valve (7).

4. An energy-saving refrigeration system according to claim 3, characterized in that: The auxiliary generator (8), the first heat exchanger (9), the ejector (10) and the second heat exchanger (11) are integrated into a composite generator-ejector heat exchanger, wherein the composite generator-ejector heat exchanger comprises a tube-sheet heat exchanger, a heat exchanger (24) and an ejector (10); The tube-sheet heat exchanger comprises a shell (12) and two tube box barrel sections (13) respectively arranged at both ends of the shell (12); a first heat exchange tube (15) communicating with the two tube box barrel sections (13) is arranged in the shell (12); a partition plate (14) is arranged in the tube-sheet heat exchanger; the partition plate (14) divides the inner cavity of the tube-sheet heat exchanger into a preheating cavity (121) and a generating cavity (122) which are isolated from each other; the preheating cavity (121) and the generating cavity (122) both comprise the shell (12), the tube box barrel section (13) and the first heat exchange tube (15).

5. An energy-saving refrigeration system according to claim 4, characterized in that: The two pipe box cylinder sections (13) of the preheating chamber (121) are respectively provided with a high-pressure and high-temperature lean liquid inlet (19) and a high-pressure and normal-temperature lean liquid outlet (21), and the shell (12) of the preheating chamber (121) is provided with a high-pressure secondary rich liquid outlet (22); The two tube box cylinder sections (13) of the generating chamber (122) are respectively provided with a high-pressure liquid refrigerant outlet (18) and a high-pressure and high-temperature gaseous refrigerant inlet (20); the shell (12) of the generating chamber (122) is provided with a high-pressure and medium-temperature rich liquid inlet (23); and the shell (12) of the generating chamber (122) is provided with a connecting port for connecting with the shell (12) of the preheating chamber (121).

6. An energy-saving refrigeration system according to claim 5, characterized in that: The partition plate (14) comprises a first partition plate (141) arranged in the shell (12) and a second partition plate (142) arranged in the pipe box barrel section (13); an opening (16) is provided through the first partition plate (141); the opening (16) is a communication port.

7. An energy-saving refrigeration system according to claim 6, characterized in that: The heat exchanger (24) comprises a cylinder section (241) and two tube sheets (246) respectively arranged at two ends of the inner cavity of the cylinder section (241); a second heat exchange tube (242) is arranged between the two tube sheets (246); one end of the cylinder section (241) is connected to the shell (12) of the generating cavity (122); the other end of the cylinder section (241) is provided with a conical shell (247); a high-pressure normal-temperature rich liquid inlet (243) and a high-pressure medium-temperature rich liquid outlet (244) are arranged on the cylinder section (241) between the two tube sheets (246); the high-pressure medium-temperature rich liquid outlet (244) is connected to the high-pressure medium-temperature rich liquid inlet (23); The ejector (10) comprises an air inlet chamber (101), a mixing chamber (103), a reducing pipe (104), a buffer pipe (105) and a diffuser pipe (106) which are connected in sequence, and a nozzle (102) for communicating with a conical shell (247) is provided in the air inlet chamber (101).

8. An energy-saving refrigeration system according to claim 7, characterized in that: A first baffle (17) for supporting a first heat exchange tube (15) is provided in the shells (12) of the preheating chamber (121) and the generating chamber (122), and a second baffle (245) for supporting a second heat exchange tube (242) is provided in the cylinder section (241).

9. An energy-saving refrigeration system process, using an energy-saving refrigeration system as claimed in claim 3, characterized in that: The following steps are involved: S1: The rich liquid is discharged from the absorber (4), transported by the solution pump (6), and preheated by the first heat exchanger (9) to become a high-pressure medium-temperature rich liquid. The rich liquid then enters the auxiliary generator (8), where it is heated by the high-pressure high-temperature gaseous refrigerant discharged from the generator (1), desorbs the secondary high-pressure high-temperature gaseous refrigerant, and the high-pressure medium-temperature rich liquid becomes a high-pressure secondary rich liquid. After the high-pressure high-temperature gaseous refrigerant absorbs heat, it condenses itself into a high-pressure liquid refrigerant. S2: The high-pressure liquid refrigerant is decompressed by the expansion valve (5) and enters the evaporator (3), where it absorbs the heat of the refrigerant and vaporizes into a low-pressure gaseous refrigerant. The sub-high-pressure and high-temperature gaseous refrigerant desorbed from the auxiliary generator (8) enters the first heat exchanger (9), where it preheats the high-pressure room-temperature rich liquid delivered by the solution pump (6) and becomes a sub-high-pressure room-temperature gaseous refrigerant. S3: the sub-high-pressure normal-temperature gaseous refrigerant enters the ejector (10), pressurizes the low-pressure gaseous refrigerant discharged from the evaporator (3), and enters the absorber (4); S4: The high-pressure secondary rich liquid discharged from the auxiliary generator (8) enters the second heat exchanger (11), is preheated by the high-pressure and high-temperature lean liquid discharged from the generator (1), and then enters the generator (1) for circulation. After the high-pressure and high-temperature lean liquid is cooled, it is reduced in pressure by the pressure reducing valve (7) and enters the absorber (4), where it absorbs the medium-pressure gaseous refrigerant ejected from the ejector (10) and becomes a low-pressure and room-temperature rich liquid, which is then circulated.

10. An energy-saving refrigeration system process, using an energy-saving refrigeration system as claimed in claim 8, characterized in that: The following steps are involved: S1: the high-pressure and high-temperature gaseous refrigerant discharged from the generator (1) enters the first heat exchange tube (15) of the generator chamber (122), heats the high-pressure medium-temperature rich liquid preheated by the heat exchanger (24), desorbs the secondary high-pressure and high-temperature gaseous refrigerant, and the high-pressure medium-temperature rich liquid becomes a high-pressure secondary rich liquid. After the high-pressure and high-temperature gaseous refrigerant absorbs heat, it condenses itself into a high-pressure liquid refrigerant; S2: the second high-pressure and high-temperature gaseous refrigerant enters the second heat exchange tube (242) of the heat exchanger (24), preheats the rich liquid delivered by the solution pump (6), enters the ejector (10), pressurizes the low-pressure gaseous refrigerant discharged from the evaporator (3), and enters the absorber (4); S3: The high-pressure secondary rich liquid enters the shell (12) of the preheating chamber (121) through the opening (16), preheats the high-pressure and high-temperature lean liquid flowing in the first heat exchange tube (15) of the preheating chamber (121), and then goes to the generator (1) to continue circulating. After the high-pressure and high-temperature lean liquid is cooled, it is reduced in pressure by the pressure reducing valve (7) and enters the absorber (4), where it absorbs the medium-pressure gaseous refrigerant ejected by the ejector (10), becomes a low-pressure and room-temperature rich liquid, and then circulates.

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