A double-effect absorption refrigeration system

Abstract

The utility model discloses a kind of double-effect absorption refrigeration systems in absorption refrigeration technical field, comprising: first absorption refrigeration unit and second absorption refrigeration unit, the first absorption refrigeration unit includes first generator, first condenser, first evaporator and first absorber, and the second absorption refrigeration unit includes second generator, second condenser, second evaporator and second absorber;The first condenser is integrated into generation condensing compounder with second generator;The application uses double-effect cascade refrigeration, and the gaseous refrigerant generated by the first generator of first absorption refrigeration unit is used as heat source to heat the generator of second absorption refrigeration unit, for whole system, improve heat source utilization rate, and the gaseous refrigerant of first generator is formed liquid refrigerant after being absorbed heat, need not use circulating water to condense again, reduce circulating water consumption.

Description

Technical Field

[0001] This utility model relates to the field of absorption refrigeration, specifically to a dual-effect absorption refrigeration system. Background Technology

[0002] In existing refrigeration technologies, conventional cascade refrigeration systems typically employ two independent refrigeration cycles coupled together to achieve lower-temperature cooling output. The low-temperature cooling generated by the first refrigeration cycle is used to cool the condenser and / or absorber in the second refrigeration cycle, thereby reducing the condensation temperature or absorption temperature of the second cycle and enabling it to operate stably at a lower evaporation temperature, thus expanding the low-temperature application range of the refrigeration system. However, existing cascade refrigeration systems have the following shortcomings: the first and second cycles are usually two independently operating refrigeration units with low system integration and a lack of synergistic utilization of thermal energy between them. Specifically, the high-temperature waste heat generated during the first cycle during the refrigeration process is not effectively recovered and utilized, resulting in energy waste, and requires circulating water for cooling, which increases the consumption of circulating water. Utility Model Content

[0003] The purpose of this invention is to provide a dual-effect absorption refrigeration system that solves the problems existing in the current cascade refrigeration system.

[0004] This utility model achieves the above-mentioned objective through the following technical solution: a dual-effect absorption refrigeration system, comprising: a first absorption refrigeration unit and a second absorption refrigeration unit, wherein the first absorption refrigeration unit comprises a first generator, a first condenser, a first evaporator and a first absorber, and the second absorption refrigeration unit comprises a second generator, a second condenser, a second evaporator and a second absorber. The first condenser and the second generator are integrated into a generator-condenser combination unit, which is used to heat the rich liquid in the second absorption chiller unit by using the gaseous refrigerant produced by the first generator as a heat source and condense and liquefy the gaseous refrigerant.

[0005] Preferably, the first absorption chiller unit further includes a first pressure reducing valve, a first throttle valve, and a first circulating pump, and the second absorption chiller unit further includes a second pressure reducing valve, a second throttle valve, and a second circulating pump.

[0006] Preferably, the first evaporator and the second absorber are integrated into an evaporation-absorption composite unit, which is used to cool the second absorber of the second absorption refrigeration unit by using the liquid refrigerant condensed in the first absorption refrigeration unit.

[0007] Preferably, the first evaporator and the second condenser are integrated into an evaporator-condenser combination unit, which is used to cool the second condenser in the second absorption refrigeration unit using the liquid refrigerant condensed in the first absorption refrigeration unit.

[0008] Preferably, the refrigerant of the first absorption chiller is water, and the refrigerant of the second absorption chiller is ammonia.

[0009] Preferably, both the condensation-generating composite unit and the evaporation-absorption composite unit include a first shell, two first tube box sections respectively disposed on both sides of the first shell, a first heat exchange tube disposed in the first shell and used to connect the two first tube box sections, and a first liquid distribution assembly disposed in the first shell. Each of the two first tube sections is provided with a first flow guide port, and the first shell is provided with three first communication ports.

[0010] Preferably, the evaporator-condenser includes a second shell, two second tube box sections respectively disposed on both sides of the second shell, a second heat exchange tube disposed inside the second shell and used to connect the two second tube box sections, and a second liquid distribution assembly disposed inside the second shell. Each of the two second tube box sections is provided with a second flow guide port, and the second shell is provided with two second communication ports.

[0011] The beneficial effects of this utility model are as follows: 1. The double-effect cascade refrigeration is adopted. The gaseous refrigerant generated by the first generator of the first absorption refrigeration unit is used as a heat source to heat the generator of the second absorption refrigeration unit. For the whole system, the heat source utilization rate is improved. In addition, the gaseous refrigerant of the first generator is converted into liquid refrigerant after absorbing heat, and there is no need to use circulating water for condensation, which reduces the consumption of circulating water. 2. The first refrigerant in this application is water, whose condensation temperature can easily be made above 100°C, making it convenient to use as a heat source to heat the generator of the second cycle. Its refrigeration efficiency is relatively high. The second refrigerant is ammonia, which can produce a higher temperature than water refrigerant. 3. The refrigerant in the first cycle directly enters the condenser or absorber of the second cycle to evaporate and cool it, reducing the two-step indirect heat exchange between the refrigerant and further improving the system efficiency, enabling the entire system to achieve efficient deep cooling. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of the dual-effect absorption refrigeration system of this utility model; Figure 2 This is a schematic diagram of one embodiment of the dual-effect absorption refrigeration system of this utility model; Figure 3 This is a schematic diagram of another embodiment of the dual-effect absorption refrigeration system of this utility model; Figure 4 This is a schematic diagram of the structure of the generator-condenser complex of this utility model; Figure 5This is a schematic diagram of the evaporator-condenser composite structure of this utility model.

[0013] In the diagram: 1. First generator; 2. First evaporator; 3. First pressure reducing valve; 4. First absorber; 5. First throttle valve; 6. First circulating pump; 7. Generator-condenser combination unit; 701. First housing; 702. First tube box section; 703. First heat exchange tube; 704. First liquid distribution assembly; 8. Second condenser; 9. Second pressure reducing valve; 10. Second evaporator; 11. Second absorber; 12. Second circulating pump; 13. Second throttle valve; 14. Evaporator-absorption combination unit; 15. Evaporator-condenser combination unit; 151. Second housing; 152. Second tube box section; 153. Second heat exchange tube; 154. Second liquid distribution assembly. Detailed Implementation

[0014] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0015] Example 1 Please see Figure 1 A dual-effect absorption refrigeration system includes: a first absorption refrigeration unit and a second absorption refrigeration unit; the first absorption refrigeration unit includes a first generator 1, a first condenser, a first evaporator 2 and a first absorber 4, and the second absorption refrigeration unit includes a second generator, a second condenser 8, a second evaporator 10 and a second absorber 11; the first condenser and the second generator are integrated into a generator-condenser combination unit 7, which serves as both the condensation device of the first absorption refrigeration unit and the generator of the second absorption refrigeration unit.

[0016] It should be noted that a heat source is introduced into the first generator 1 to heat the rich liquid therein, causing the refrigerant to decompose and form a high-pressure gaseous refrigerant (labeled as the first high-pressure gaseous refrigerant). This gaseous refrigerant then enters the generator-condenser-combiner 7, serving as a heat source for the second absorption chiller unit. It heats the rich liquid in the second absorption chiller unit, causing the refrigerant to decompose and form a high-pressure gaseous refrigerant (labeled as the second high-pressure gaseous refrigerant). The second high-pressure gaseous refrigerant then enters the second condenser 8, where it is condensed by external circulating water into a second high-pressure liquid refrigerant. The liquid refrigerant is then depressurized by the second pressure reducing valve 9. Then, it enters the second evaporator 10, absorbs heat from the external refrigerant and vaporizes into the second low-pressure gaseous refrigerant. After that, it enters the second absorber 11, absorbs the low-pressure lean liquid from the generator-condenser 7 after it has been processed, and forms a rich liquid. Then, it is transported to the generator-condenser 7 for circulation by the second circulation pump 12. The first high-pressure gaseous refrigerant absorbs heat in the generator-condenser 7 and condenses into the first gaseous refrigerant. The first gaseous refrigerant is depressurized by the first pressure reducing valve 3 and then enters the first evaporator 2 for circulation. The subsequent process is the same as the working mode of the second absorption chiller unit.

[0017] In this embodiment, as a further optimization, please refer to... Figure 1 The first absorption chiller unit also includes a first pressure reducing valve 3, a first throttle valve 5, and a first circulating pump 6. The second absorption chiller unit also includes a second pressure reducing valve 9, a second throttle valve 13, and a second circulating pump 12. The first throttle valve 5 is located between the first generator 1 and the first absorber 4 and is used to reduce the pressure of the lean liquid delivered from the first generator 1 to the first absorber 4. The first circulating pump 6 is used to input the rich liquid discharged from the first absorber 4 into the first generator 1. The first pressure reducing valve 3 is used to reduce the pressure of the liquid refrigerant (the liquid refrigerant is produced by the first generator 1) discharged from the generator-condenser 7. The connection method and function of the second pressure reducing valve 9, the second throttle valve 13, and the second circulating pump 12 in the second absorption chiller unit are the same as those in the first absorption chiller unit, and will not be described in detail here.

[0018] In this embodiment, as a further optimization, please refer to... Figure 1 The first absorption chiller uses water as its refrigerant, and its condensation temperature can easily reach above 100°C, making it convenient as a heat source to heat the generator of the second absorption chiller. Its refrigeration efficiency is relatively high, such as the lithium bromide chiller. The second absorption chiller uses ammonia as its refrigerant, which can produce temperatures higher than that of water refrigerant.

[0019] Example 2 As a further optimization of Example 1, please refer to Figure 2The first evaporator 2 and the second absorber 11 are integrated into an evaporation-absorption complex 14. The high-pressure gaseous refrigerant produced by the first generator 1 absorbs heat in the generator-condenser complex 7 and becomes a high-pressure liquid refrigerant. It is then depressurized into a low-pressure liquid refrigerant by the first pressure reducing valve 3 and introduced into the evaporation-absorption complex 14 as a cold source. The lean liquid produced in the generator-condenser complex 7 and the gaseous refrigerant produced by the second evaporator 10 enter the interior of the evaporation-absorption complex 14 and mix. The heat generated by the mixing is carried away by the low-pressure liquid refrigerant in the pipe. After absorbing heat, the low-pressure liquid refrigerant vaporizes into a low-pressure gaseous refrigerant and then enters the first absorber 4.

[0020] In this embodiment, as a further optimization, please refer to... Figure 4 Both the generating-condensing composite unit 7 and the evaporating-absorbing composite unit 14 include a first housing 701, two first tube box sections 702 respectively disposed on both sides of the first housing 701, a first heat exchange tube 703 disposed inside the first housing 701 and used to connect the two first tube box sections 702, and a first liquid distribution assembly 704 (including pipes and nozzles disposed on the pipes) disposed at the top of the inner cavity of the first housing 701; each of the two first tube box sections 702 is provided with a first guide port, and the first housing 701 is provided with three first connecting ports, two of which are located at the top of the first housing 701 and one of which is located at the bottom of the first housing 701; taking the generating-condensing composite unit 7 as an example... For example, the first guide port on the left is the inlet of the first high-pressure gaseous refrigerant, and the first guide port on the right is the outlet of the first high-pressure liquid refrigerant; the two first connecting ports on the upper side are respectively the rich liquid inlet (connected to the first liquid distribution assembly 704) and the second high-pressure gaseous refrigerant outlet, and the first connecting port on the lower side is the lean solution outlet; taking the evaporation-absorption composite unit 14 as an example, the first guide port on the left is the inlet of the first low-pressure gaseous refrigerant, and the first guide port on the right is the outlet of the first low-pressure liquid refrigerant; the two first connecting ports on the upper side are respectively the lean liquid inlet (connected to the first liquid distribution assembly 704) and the second low-pressure gaseous refrigerant inlet, and the first connecting port on the lower side is the rich solution outlet.

[0021] Example 3 As a further optimization of Example 1, please refer to Figure 3 The first evaporator 2 and the second condenser 8 are integrated into an evaporative-condensing composite unit 15. The first high-pressure gaseous refrigerant produced by the first generator 1 absorbs heat in the evaporative-condensing composite unit 7 and becomes a high-pressure liquid refrigerant. It is then depressurized into a low-pressure liquid refrigerant by the first pressure reducing valve 3 and introduced into the evaporative-condensing composite unit 15 as a cold source. The second high-pressure gaseous refrigerant generated in the evaporative-condensing composite unit 7 enters the evaporative-absorption composite unit 14 and is condensed into a second high-pressure liquid refrigerant by the cold source. The low-pressure liquid refrigerant absorbs heat and vaporizes into a low-pressure gaseous refrigerant, which then enters the first absorber 4.

[0022] In this embodiment, as a further optimization, please refer to... Figure 5 The evaporator-condenser 15 includes a second housing 151, two second tube box sections 152 respectively disposed on both sides of the second housing 151, a second heat exchange tube 153 disposed inside the second housing 151 and used to connect the two second tube box sections 152, and a second liquid distribution assembly 154 (including pipes and nozzles disposed on the pipes) disposed at the top of the inner cavity of the second housing 151. Each of the two second tube box sections 152 is provided with a second guide port, and the second housing 151 is provided with two second connecting ports. The left second guide port is the inlet of the second high-pressure gaseous refrigerant, and the right second guide port is the outlet of the second high-pressure liquid refrigerant. The two second connecting ports are the inlet of the first low-pressure liquid refrigerant and the outlet of the first low-pressure gaseous refrigerant, respectively.

[0023] The embodiments described above are merely examples of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these modifications and improvements all fall within the protection scope of this utility model.

Claims

1. A dual-effect absorption refrigeration system, comprising: The first absorption refrigeration unit and the second absorption refrigeration unit are characterized in that the first absorption refrigeration unit includes a first generator (1), a first condenser, a first evaporator (2) and a first absorber (4), and the second absorption refrigeration unit includes a second generator, a second condenser (8), a second evaporator (10) and a second absorber (11). The first condenser and the second generator are integrated into a generator-condenser complex (7), which uses the gaseous refrigerant produced by the first generator (1) as a heat source to heat the rich liquid in the second absorption chiller and condense and liquefy the gaseous refrigerant.

2. The double-effect absorption refrigeration system according to claim 1, characterized in that, The first absorption chiller unit also includes a first pressure reducing valve (3), a first throttle valve (5) and a first circulating pump (6), and the second absorption chiller unit also includes a second pressure reducing valve (9), a second throttle valve (13) and a second circulating pump (12).

3. The double-effect absorption refrigeration system according to claim 1, characterized in that, The first evaporator (2) and the second absorber (11) are integrated into an evaporation-absorption complex (14), which is used to cool the second absorber (11) of the second absorption refrigeration unit by using the liquid refrigerant condensed in the first absorption refrigeration unit.

4. The double-effect absorption refrigeration system according to claim 1, characterized in that, The first evaporator (2) and the second condenser (8) are integrated into an evaporation-condensation composite unit (15), which is used to cool the second condenser (8) in the second absorption refrigeration unit by using the liquid refrigerant condensed in the first absorption refrigeration unit.

5. A double-effect absorption refrigeration system according to claim 1, characterized in that, The refrigerant of the first absorption chiller is water, and the refrigerant of the second absorption chiller is ammonia.

6. A double-effect absorption refrigeration system according to claim 3, characterized in that, The condensation-generating composite unit (7) and the evaporation-absorbing composite unit (14) both include a first shell (701), two first tube box sections (702) respectively disposed on both sides of the first shell (701), a first heat exchange tube (703) disposed in the first shell (701) and used to connect the two first tube box sections (702), and a first liquid distribution assembly (704) disposed in the first shell (701). Each of the two first tube box sections (702) is provided with a first flow guide port, and the first shell (701) is provided with three first communication ports.

7. A double-effect absorption refrigeration system according to claim 4, characterized in that, The evaporator-condenser (15) includes a second shell (151), two second tube box sections (152) respectively disposed on both sides of the second shell (151), a second heat exchange tube (153) disposed in the second shell (151) and used to connect the two second tube box sections (152), and a second liquid distribution assembly (154) disposed in the second shell (151). The two second tube box sections (152) are each provided with a second flow guide port, and the second shell (151) is provided with two second communication ports.

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