Cross-type absorption and re-absorption heat pump device based on GAX circulation

Abstract

The invention provides a cross-type absorption and re-absorption heat pump device based on GAX circulation, which comprises a low-pressure generator, a high-pressure absorber, a low-pressure absorber and a high-pressure generator, the low-pressure absorber comprises a cooling absorber and a GAX absorber which are communicated with each other, and the high-pressure generator comprises a GAX generator and an external heating generator which are communicated with each other; an outlet of the cooling absorber and an air outlet of the GAX generator are both communicated with an inlet of the high-pressure absorber, an outlet of the high-pressure absorber is communicated with an inlet of the low-pressure generator, an outlet of the low-pressure generator and an outlet of the cooling absorber are both communicated with an inlet of the heat exchange pipeline, and the heat exchange pipeline penetrates through the cooling absorber. An outlet of the heat exchange pipeline is communicated with an inlet of the GAX generator, and an outlet of the external heating generator is communicated with the GAX absorber. According to the technical scheme provided by the invention, the problem that the COP (coefficient of performance) of the absorption heat pump in the related technology is increased in a limited manner can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of heat pump devices, and in particular to a cross-absorption and reabsorption heat pump device based on a GAX cycle. Background Art

[0002] Due to the rapid development of the global economy, the consumption of primary energy has increased dramatically, leading to the depletion of fossil fuel reserves and negative environmental impacts such as greenhouse gas emissions and water acidification. However, more than 70% of the world's energy consumption is provided by power plants that burn fossil energy, resulting in a large amount of greenhouse gases being released into the atmosphere. In addition, about 72% of the world's energy consumption is discharged in the form of waste heat, which not only leads to low energy utilization efficiency, but also causes thermal pollution, posing a threat to the balance of the ecosystem and human health. Therefore, the development of efficient energy recovery and reuse technology is crucial to the development of today's society.

[0003] Among the related technologies, absorption heat pump, as a refrigeration and heating device driven by low-grade heat source, has shown great application potential in the field of industrial waste heat recovery. At present, the technology to improve the performance of heat pumps mainly focuses on improving heat transfer efficiency and optimizing the system cycle process, such as system model innovation, the use of nanofluids, and the adoption of membrane absorbers and generators with high surface area to volume ratio.

[0004] However, the absorption heat pump in the related art still has the problem of limited improvement in COP (coefficient of performance), and even when the temperature of the heat source is too high, there is a risk of performance degradation. Summary of the invention

[0005] The present invention provides a cross-type absorption and reabsorption heat pump device based on GAX cycle to solve the problem of limited COP improvement of absorption heat pump in related art.

[0006] The present invention provides a cross-absorption and reabsorption heat pump device based on GAX cycle. The cross-absorption and reabsorption heat pump device based on GAX cycle comprises a low-pressure generator, a high-pressure absorber, a low-pressure absorber and a high-pressure generator. The low-pressure absorber comprises a cooling absorber and a GAX absorber which are connected. The high-pressure generator comprises a GAX generator and an external heating generator which are connected. The outlet of the cooling absorber and the air outlet of the GAX generator are both connected to the inlet of the high-pressure absorber, the outlet of the high-pressure absorber is connected to the inlet of the low-pressure generator, the outlet of the low-pressure generator and the outlet of the cooling absorber are both connected to the inlet of a heat exchange pipeline, the heat exchange pipeline is penetrated in the cooling absorber, the outlet of the heat exchange pipeline is connected to the inlet of the GAX generator, and the outlet of the external heating generator is connected to the GAX absorber.

[0007] Furthermore, the cross-absorption and reabsorption heat pump device based on the GAX cycle also includes a connecting main pipe, a first connecting branch pipe and a second connecting branch pipe. The outlet of the cooling absorber is connected to the inlet of the connecting main pipe, the inlet of the first connecting branch pipe and the inlet of the second connecting branch pipe are respectively connected to the outlet of the connecting main pipe, the outlet of the first connecting branch pipe is connected to the inlet of the high-pressure absorber, and the outlet of the second connecting branch pipe is connected to the inlet of the heat exchange pipeline.

[0008] Furthermore, a first flow dividing piece is arranged on the first connecting branch pipe, and a second flow dividing piece is arranged on the second connecting branch pipe.

[0009] Furthermore, a first solution pump is arranged on the connecting main pipe.

[0010] Furthermore, the cross-absorption and reabsorption heat pump device based on the GAX cycle also includes a control element, which is signal-connected to the first flow diverter and the second flow diverter, respectively, to control the operation of the first flow diverter and the second flow diverter.

[0011] Furthermore, the cooling absorber includes a water-cooled absorber and a solution-cooled absorber. The water-cooled absorber, the solution-cooled absorber and the GAX absorber are connected in sequence. The outlet of the cooling absorber is arranged at the water-cooled absorber. The heat exchange pipeline is arranged through the solution-cooled absorber.

[0012] Furthermore, the cross-absorption and reabsorption heat pump device based on the GAX cycle also includes a solution heat exchanger, the outlet of the high-pressure absorber is connected to the inlet of the low-pressure generator through a first pipeline, the outlet of the low-pressure generator and the inlet of the heat exchange pipeline are connected through a second pipeline, and the first pipeline and the second pipeline are both arranged in the solution heat exchanger.

[0013] Furthermore, a first throttle valve is provided on the first pipeline, and the first throttle valve is located between the solution heat exchanger and the low-pressure generator.

[0014] Furthermore, a second solution pump is provided on the second pipeline, and the second solution pump is located between the solution heat exchanger and the low-pressure generator.

[0015] Furthermore, the outlet of the external heating generator is connected to the GAX absorber through a third pipeline, and a second throttle valve is arranged on the third pipeline.

[0016] By applying the technical solution of the present invention, the cross-type absorption and reabsorption heat pump device based on the GAX cycle includes a low-pressure generator, a high-pressure absorber, a low-pressure absorber and a high-pressure generator. The low-pressure absorber includes a cooling absorber and a GAX absorber connected to each other, and the high-pressure generator includes a GAX generator and an external heating generator connected to each other. By replacing the evaporator and the condenser in the traditional absorption heat pump cycle with a low-pressure generator and a high-pressure absorber, respectively, an absorption-reabsorption solution cycle is formed. The internal structure of the high-pressure generator is designed as a GAX generator and an external heating generator, and the internal structure of the low-pressure absorber is designed as a cooling absorber and a GAX absorber, so as to provide part of the absorbed heat as a driving heat source to the GAX generator, thereby reducing the required heat source heat and effectively improving the system COP. Unlike the traditional absorption heat pump cycle, the absorption and reabsorption process of the low-pressure side and high-pressure side absorbers of the technical solution of the present invention depends on a binary mixture (ammonia-water). Therefore, the high pressure and low pressure are not only limited by the saturation temperature, but also by the saturation concentration of the binary mixture. Under given operating conditions, the internal high and low pressures can be adjusted by changing the internal solution concentration difference, and vice versa, to obtain the system cycle COP under different operating conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0018] Figure 1 A schematic diagram of a cross-absorption and reabsorption heat pump device based on a GAX cycle provided according to an embodiment of the present invention is shown.

[0019] The above drawings include the following reference numerals:

[0020] 10. Low voltage generator;

[0021] 20. High pressure absorber;

[0022] 30. Low-pressure absorber; 31. Cooling absorber; 311. Water-cooling absorber; 312. Solution-cooling absorber; 32. GAX absorber;

[0023] 40. High voltage generator; 41. GAX generator; 42. External heating generator;

[0024] 50. Heat exchange pipeline;

[0025] 61. connecting main pipe; 62. first connecting branch pipe; 63. second connecting branch pipe; 64. first flow dividing piece; 65. second flow dividing piece; 66. first solution pump;

[0026] 70. solution heat exchanger; 71. first pipeline; 72. second pipeline; 73. first throttle valve; 74. second solution pump;

[0027] 81. Third pipeline; 82. Second throttle valve. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings 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. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. All other embodiments obtained by ordinary technicians in this field without creative work based on the embodiments of the present invention are within the scope of protection of the present invention.

[0029] like Figure 1 As shown, the embodiment of the present invention provides a cross-type absorption and reabsorption heat pump device based on GAX cycle, which includes a low-pressure generator 10, a high-pressure absorber 20, a low-pressure absorber 30 and a high-pressure generator 40. The low-pressure absorber includes a cooling absorber 31 and a GAX absorber 32 connected to each other, and the high-pressure generator includes a GAX generator 41 and an external heating generator 42 connected to each other. Among them, the outlet of the cooling absorber 31 and the gas outlet of the GAX generator 41 are both connected to the inlet of the high-pressure absorber 20, the outlet of the high-pressure absorber 20 is connected to the inlet of the low-pressure generator 10, the outlet of the low-pressure generator 10 and the outlet of the cooling absorber 31 are both connected to the inlet of the heat exchange pipeline 50, the heat exchange pipeline 50 is arranged in the cooling absorber 31, the outlet of the heat exchange pipeline 50 is connected to the inlet of the GAX generator 41, and the outlet of the external heating generator 42 is connected to the GAX absorber 32.

[0030] The cross-type absorption and reabsorption heat pump device based on the GAX cycle provided in this embodiment is applied, and the evaporator and condenser in the traditional absorption heat pump cycle are replaced by the low-pressure generator 10 and the high-pressure absorber 20, respectively, to form an absorption-reabsorption solution cycle. The internal structure of the high-pressure generator 40 is designed as a GAX generator 41 and an external heating generator 42, and the internal structure of the low-pressure absorber 30 is designed as a cooling absorber 31 and a GAX absorber 32, so as to provide part of the absorption heat as a driving heat source to the GAX generator 41, which plays a role in reducing the required heat source heat, and can effectively improve the system COP. Unlike the traditional absorption heat pump cycle, the absorption and reabsorption process of the low-pressure side and high-pressure side absorbers of this embodiment depends on the binary mixture (ammonia-water). Therefore, the high pressure and low pressure are not only limited by the saturation temperature, but also by the saturation concentration of the binary mixture. Under given operating conditions, the internal high pressure and low pressure can be adjusted by changing the internal solution concentration difference, and vice versa, so as to obtain the system cycle COP under different working conditions.

[0031] It should be noted that the COP improvement of a conventional absorption heat pump is limited when the heat source temperature is above 100°C. The cross-absorption and reabsorption heat pump device based on the GAX cycle provided in this embodiment can have a higher COP when the heat source temperature is above 100°C.

[0032] like Figure 1 As shown, the cross-type absorption and reabsorption heat pump device based on the GAX cycle also includes a connecting main pipe 61, a first connecting branch pipe 62 and a second connecting branch pipe 63. The outlet of the cooling absorber 31 is connected to the inlet of the connecting main pipe 61, the inlet of the first connecting branch pipe 62 and the inlet of the second connecting branch pipe 63 are respectively connected to the outlet of the connecting main pipe 61, the outlet of the first connecting branch pipe 62 is connected to the inlet of the high-pressure absorber 20, and the outlet of the second connecting branch pipe 63 is connected to the inlet of the heat exchange pipeline 50. The medium flowing out of the outlet of the cooling absorber 31 first enters the connecting main pipe 61, and then flows to the high-pressure absorber 20 through the first connecting branch pipe 62, and flows to the heat exchange pipeline 50 through the second connecting branch pipe 63, so as to realize the diversion of the medium in the connecting main pipe 61.

[0033] Specifically, a first flow divider 64 is provided on the first connecting branch pipe 62, and a second flow divider 65 is provided on the second connecting branch pipe 63. The first flow divider 64 can be used to control the flow of the first connecting branch pipe 62, and the second flow divider 65 can be used to control the flow of the second connecting branch pipe 63, thereby controlling the flow ratio between the first connecting branch pipe 62 and the second connecting branch pipe 63.

[0034] In this embodiment, the first flow dividing member 64 and the second flow dividing member 65 are both flow dividing valves.

[0035] In this embodiment, a first solution pump 66 is disposed on the communication main pipe 61. The first solution pump 66 is used to provide a driving force for the medium flowing out of the outlet of the cooling absorber 31 to flow.

[0036] The cross-absorption and reabsorption heat pump device based on the GAX cycle further includes a control component, which is respectively connected to the first flow diverter 64 and the second flow diverter 65 by signals to control the operation of the first flow diverter 64 and the second flow diverter 65. The use of the control component to control the operation of the first flow diverter 64 and the second flow diverter 65 can improve the automation of the device.

[0037] like Figure 1 As shown, in this embodiment, the cooling absorber 31 includes a water cooling absorber 311 and a solution cooling absorber 312. The water cooling absorber 311, the solution cooling absorber 312 and the GAX absorber 32 are connected in sequence, the outlet of the cooling absorber 31 is arranged at the water cooling absorber 311, and the heat exchange pipeline 50 is arranged through the solution cooling absorber 312. The water cooling absorber 311 and the solution cooling absorber 312 cooperate to improve the heat exchange effect.

[0038] like Figure 1 As shown, in this embodiment, the cross-type absorption and reabsorption heat pump device based on the GAX cycle also includes a solution heat exchanger 70, the outlet of the high-pressure absorber 20 is connected to the inlet of the low-pressure generator 10 through a first pipeline 71, and the outlet of the low-pressure generator 10 and the inlet of the heat exchange pipeline 50 are connected through a second pipeline 72, and the first pipeline 71 and the second pipeline 72 are both arranged in the solution heat exchanger 70. A first throttle valve 73 is arranged on the first pipeline 71, and the first throttle valve 73 is located between the solution heat exchanger 70 and the low-pressure generator 10. A second solution pump 74 is arranged on the second pipeline 72, and the second solution pump 74 is located between the solution heat exchanger 70 and the low-pressure generator 10.

[0039] The solution is cooled and throttled through the solution heat exchanger 70 and the first throttle valve 73. The solution at the outlet of the low-pressure generator 10 is heated and pressurized through the solution heat exchanger 70 and the second solution pump 74.

[0040] like Figure 1 As shown, in this embodiment, the outlet of the external heating generator 42 is connected to the GAX absorber 32 through the third pipeline 81, and a second throttle valve 82 is provided on the third pipeline 81. The dilute ammonia solution is sent to the low-pressure absorber 30 after being reduced in pressure and throttled by the second throttle valve 82.

[0041] In order to facilitate understanding of the cross-type absorption and reabsorption heat pump device based on the GAX cycle provided in this embodiment, the following is an explanation in conjunction with the solution loop:

[0042] The heat pump device is divided into two solution loops;

[0043] The saturated concentrated ammonia solution coming out of the cooling absorber 31 is pressurized by the first solution pump 66 to form a high-pressure concentrated ammonia solution, which is then split into two streams with the same concentration and different flow rates;

[0044] The solution of one of the solution loops is sent to the high-pressure absorber 20 and mixed with the ammonia vapor at the outlet of the GAX generator 41 to undergo an absorption process, thereby forming a saturated solution at the outlet of the high-pressure absorber 20;

[0045] After the solution is cooled and throttled by the solution heat exchanger 70 and the first throttle valve 73, it is sent to the low-pressure generator 10 to generate saturated dilute ammonia solution and steam by absorbing heat from the air;

[0046] The outlet solution of the low-pressure generator 10 is heated and pressurized by the solution heat exchanger 70 and the second solution pump 74, and then mixed with the outlet solution of the second flow divider 65 and sent to the solution cooling absorber 312 to recover part of the absorption heat, and then sent to the GAX generator 41;

[0047] The solution in the GAX generator 41 absorbs heat from the GAX heat exchanger and the driving heat source to form a saturated dilute ammonia solution and ammonia vapor. The ammonia vapor is sent to the high-pressure absorber 20 for absorption, while the dilute ammonia solution is sent to the low-pressure absorber 30 after being reduced in pressure and throttled by the second throttle valve 82, and is once again mixed with the outlet steam of the low-pressure generator 10 to complete the absorption process.

[0048] Among them, a throttle valve and a solution pump are installed in the cycle to achieve the required working pressure and ensure the stable operation of the cycle.

[0049] In this embodiment, an air pipeline is provided through the low-pressure generator 10 , and an inlet and an outlet of the air pipeline are both located outside the low-pressure generator 10 .

[0050] In other embodiments, the two solution loops can be designed to operate in parallel or in alternating mode, so as to dynamically adjust the flow distribution under different working conditions, optimize the concentration difference of the solution, and further improve the COP of the system. This solution requires the addition of a control system, but it can enhance the adaptability of the system under complex load conditions.

[0051] Alternatively, a new absorber design can be used, for example, by improving the internal structure of the absorber and strengthening the heat exchange mechanism to reduce the efficiency loss caused by uneven flow or insufficient heat exchange during the absorption process. The modular absorber design can also make the system more flexible to cope with different operating conditions.

[0052] Among them, the cross-absorption and reabsorption heat pump device based on the GAX cycle provided in this embodiment can expand the application range and increase the heating temperature at low ambient temperatures. Under given operating conditions, using a variety of internal heat recovery technologies, the heat pump device can operate under ambient air temperatures of -15.6°C.

[0053] It should be noted that the cross-absorption and reabsorption heat pump device based on the GAX cycle provided in this embodiment has the following beneficial effects:

[0054] 1) Saving equipment parts: Since the stable operation of the system can be achieved by adjusting the mass flow at the inlet of the high-pressure absorber 20, and the cross-solution mixing design is adopted, the system does not need distillation, so the rectifier is omitted. In contrast, the traditional heat pump needs to install a rectifier after the generator to ensure the mass balance between the two.

[0055] 2) Having a larger degassing range: By effectively utilizing the solution at the outlet of the low-pressure generator 10, the solution concentration at the outlet of the GAX generator 41 is increased, so that the degassing range of the two solution cycles is increased, and the COP of the system is improved.

[0056] 3) Improve economic and environmental benefits. Since the present invention uses flue gas waste heat as a driving heat source, it saves fuel costs, reduces pollutant emissions, and is beneficial to energy conservation, emission reduction and environmental sustainability.

[0057] 4) Lower working pressure: Since the evaporator and condenser are replaced by a low-pressure generator and a high-pressure absorber, the solution concentration at the outlet of the high-pressure absorber is lower than that at the outlet of the condenser. When the outlet temperature of the absorber remains unchanged, the working pressure is lower. Since the system adopts the GAX cycle, it has more obvious advantages under higher driving heat sources.

[0058] 5) Large mass transfer potential energy: In the traditional absorption-reabsorption cycle, the solution at the outlet of the low-pressure generator is directly sent to the high-pressure absorber to mix with steam after being pressurized by a pump and heat exchanged by a solution heat exchanger. In the solution cycle of the present invention, the concentration of the solution sent to the high-pressure absorber is lower, which is more conducive to the heat and mass transfer process.

[0059] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0060] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present invention. Meanwhile, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to actual proportional relationships. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being only exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0061] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0062] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0063] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only to facilitate the distinction between corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0064] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A cross-absorption and reabsorption heat pump device based on GAX cycle, characterized in that: The cross-type absorption and reabsorption heat pump device based on the GAX cycle comprises a low-pressure generator (10), a high-pressure absorber (20), a low-pressure absorber (30) and a high-pressure generator (40), wherein the low-pressure absorber comprises a cooling absorber (31) and a GAX absorber (32) connected to each other, and the high-pressure generator comprises a GAX generator (41) and an external heating generator (42) connected to each other; The outlet of the cooling absorber (31) and the gas outlet of the GAX generator (41) are both connected to the inlet of the high-pressure absorber (20), the outlet of the high-pressure absorber (20) is connected to the inlet of the low-pressure generator (10), the outlet of the low-pressure generator (10) and the outlet of the cooling absorber (31) are both connected to the inlet of a heat exchange pipeline (50), the heat exchange pipeline (50) is penetrated by the cooling absorber (31), the outlet of the heat exchange pipeline (50) is connected to the inlet of the GAX generator (41), and the outlet of the external heating generator (42) is connected to the GAX absorber (32).

2. The cross-type absorption and reabsorption heat pump device based on the GAX cycle according to claim 1 is characterized in that: The cross-absorption and reabsorption heat pump device based on the GAX cycle also includes a connecting main pipe (61), a first connecting branch pipe (62) and a second connecting branch pipe (63); the outlet of the cooling absorber (31) is connected to the inlet of the connecting main pipe (61); the inlet of the first connecting branch pipe (62) and the inlet of the second connecting branch pipe (63) are respectively connected to the outlet of the connecting main pipe (61); the outlet of the first connecting branch pipe (62) is connected to the inlet of the high-pressure absorber (20); and the outlet of the second connecting branch pipe (63) is connected to the inlet of the heat exchange pipeline (50).

3. The cross-type absorption and reabsorption heat pump device based on the GAX cycle according to claim 2 is characterized in that: The first connecting branch pipe (62) is provided with a first flow dividing member (64), and the second connecting branch pipe (63) is provided with a second flow dividing member (65).

4. The cross-type absorption and reabsorption heat pump device based on the GAX cycle according to claim 2 is characterized in that: The communication main pipe (61) is provided with a first solution pump (66).

5. The cross-type absorption and reabsorption heat pump device based on the GAX cycle according to claim 3 is characterized in that: The cross-absorption and reabsorption heat pump device based on the GAX cycle also includes a control element, which is respectively connected to the first flow divider (64) and the second flow divider (65) by signals to control the operation of the first flow divider (64) and the second flow divider (65).

6. The cross-type absorption and reabsorption heat pump device based on GAX cycle according to claim 2, characterized in that: The cooling absorber (31) comprises a water-cooled absorber (311) and a solution-cooled absorber (312); the water-cooled absorber (311), the solution-cooled absorber (312) and the GAX absorber (32) are connected in sequence; the outlet of the cooling absorber (31) is arranged at the water-cooled absorber (311); and the heat exchange pipeline (50) is passed through the solution-cooled absorber (312).

7. The cross-type absorption and reabsorption heat pump device based on the GAX cycle according to claim 1 is characterized in that: The cross-absorption and reabsorption heat pump device based on the GAX cycle also includes a solution heat exchanger (70), the outlet of the high-pressure absorber (20) and the inlet of the low-pressure generator (10) are connected through a first pipeline (71), the outlet of the low-pressure generator (10) and the inlet of the heat exchange pipeline (50) are connected through a second pipeline (72), and the first pipeline (71) and the second pipeline (72) are both arranged in the solution heat exchanger (70).

8. The cross-type absorption and reabsorption heat pump device based on the GAX cycle according to claim 7, characterized in that: The first pipeline (71) is provided with a first throttle valve (73), and the first throttle valve (73) is located between the solution heat exchanger (70) and the low-pressure generator (10).

9. The cross-type absorption and reabsorption heat pump device based on the GAX cycle according to claim 7, characterized in that: The second pipeline (72) is provided with a second solution pump (74), and the second solution pump (74) is located between the solution heat exchanger (70) and the low-pressure generator (10).

10. The cross-type absorption and reabsorption heat pump device based on GAX cycle according to claim 1, characterized in that: The outlet of the external heating generator (42) is connected to the GAX absorber (32) through a third pipeline (81), and a second throttle valve (82) is provided on the third pipeline (81).

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