Heat and power cogeneration system and method for coupling terrestrial heat source absorption heat pump with organic Rankine cycle

Abstract

The invention relates to the technical field of low-grade energy, in particular to a combined heat and power system and method for coupling a geothermal source absorption heat pump with an organic Rankine cycle. Comprising a heat pump cycle unit and an organic Rankine cycle unit which are connected. The heat pump cycle unit comprises a generator, a heat pump condenser, a heat pump evaporator, an absorber and a heat pump regenerator, efficient utilization of medium and low temperature geothermal resources is achieved by coupling heat pump cycle and organic Rankine cycle, and the system has the advantages of being simple in structure, high in operation and adjustment flexibility, capable of promoting new energy consumption, safe, stable, high in efficiency and the like. And the method has important significance on utilization of medium and low temperature geothermal resources and other low-grade waste heat.

Description

Technical Field

[0001] The present invention relates to the technical field of low-grade energy, and in particular to a heat and power cogeneration system and method of a geothermal source absorption heat pump coupled with an organic Rankine cycle. Background Art

[0002] Energy security is a top priority for national development. In this context, geothermal energy, as a clean and sustainable form of energy, has demonstrated unique advantages. Geothermal energy is not only low-cost, but its operation is not affected by climate change and can achieve uninterrupted power supply. In addition, geothermal power generation does not require the construction of complex energy storage systems, and can effectively complement renewable energy sources with greater volatility, such as wind and solar energy. Therefore, promoting geothermal power generation is of great significance to improving the structure of renewable energy and ensuring the safe and stable supply of energy.

[0003] At present, my country's geothermal energy has achieved commercial power generation in high-temperature geothermal sources and has achieved good results. However, in the utilization of medium- and low-temperature geothermal resources with more abundant reserves, it faces the following problems. At present, medium- and low-temperature geothermal energy is mainly used for direct heat utilization. Due to the slow progress of medium- and low-temperature geothermal power generation technology, existing technologies such as flash evaporation, semiconductor temperature difference power generation, Kalina cycle and organic Rankine cycle still have deficiencies in efficiency and reliability, resulting in low output power density, poor economy, and difficulty in achieving large-scale development. Summary of the invention

[0004] In response to the problems mentioned in the prior art, the present invention proposes a combined heat and power system and method of a geothermal absorption heat pump coupled with an organic Rankine cycle, which can efficiently improve the utilization rate of medium and low temperature geothermal energy, increase the output power, and thus achieve large-scale development.

[0005] In order to achieve the above object, the present invention adopts the following technical solution: The present invention discloses a combined heat and power system of a geothermal absorption heat pump coupled with an organic Rankine cycle, comprising a heat pump cycle unit and an organic Rankine cycle unit connected to each other; The heat pump circulation unit includes a generator, a heat pump condenser, a heat pump evaporator, an absorber and a heat pump regenerator; The cold phase outlet and solution outlet of the generator are connected to the hot phase inlet of the heat pump condenser and the cold phase inlet of the heat pump regenerator respectively, the cold phase outlet of the heat pump regenerator is connected to the hot phase solution inlet of the absorber, the hot phase outlet of the absorber is connected to the hot phase inlet of the heat pump regenerator, the heat pump regenerator is connected to the cold phase inlet of the generator, the hot phase outlet of the heat pump condenser is connected to the cold phase inlet of the heat pump evaporator, and the cold phase outlet of the heat pump evaporator is connected to the hot phase inlet of the absorber; The organic Rankine cycle unit includes an expander, a heat engine regenerator and a heat engine condenser; the cold phase outlet of the heat engine regenerator is connected to the cold phase inlet of the absorber, the cold phase outlet of the absorber is connected to the inlet of the expander, the expander outlet is connected to the hot phase inlet of the heat engine regenerator, the hot phase outlet of the heat engine regenerator is connected to the hot phase inlet of the heat engine condenser, and the hot phase outlet of the heat engine condenser is connected to the cold phase inlet of the heat engine regenerator.

[0006] As a further improvement of the present invention, it also includes a cooling tower, and the cold phase end of the heat engine condenser is connected to the cooling tower.

[0007] As a further improvement of the present invention, it also includes a geothermal source, the hot phase end of the generator is connected to the geothermal source, and the hot phase end of the heat pump evaporator is connected to the geothermal source; the input temperature of the geothermal source is 90°C, and the output temperature is 80°C.

[0008] As a further improvement of the present invention, it also includes a secondary heating network, and the cold phase end of the heat pump condenser is connected to the secondary heating network; the inlet temperature of the secondary heating network is 50°C, and the outlet temperature is 35°C.

[0009] As a further improvement of the present invention, a first booster pump is provided between the hot phase outlet of the heat pump condenser and the cold phase inlet of the heat pump evaporator; a second booster pump is provided between the generator solution outlet and the cold phase inlet of the heat pump regenerator; A third booster pump is provided between the hot phase outlet of the heat engine condenser and the cold phase inlet of the heat engine regenerator; An expansion valve is provided between the heat pump regenerator and the cold phase inlet of the generator.

[0010] As a further improvement of the present invention, the hot phase inlet temperature of the generator is 79°C, and the hot phase outlet temperature is 74°C; the absorber reaction temperature is 135°C, and the pressure is 38.6 kPa.

[0011] As a further improvement of the present invention, the solution in the generator is a lithium bromide solution, the mass fraction of the solution at the generator inlet is 57%, and the mass fraction of the solution at the solution outlet is 60%.

[0012] As a further improvement of the present invention, the compression ratio of the first booster pump and the first booster pump is 2.5, the expansion ratio of the expansion valve is 2.5, the compression ratio of the third booster pump is 8.4, and the expansion ratio of the expander is 8.4.

[0013] As a further improvement of the present invention, the circulating working fluid of the organic Rankine cycle unit is R1233zd(E).

[0014] A method for a combined heat and power system of a geothermal absorption heat pump coupled with an organic Rankine cycle, wherein when the heat pump circulation unit is in operation, water in a lithium bromide solution in a generator absorbs heat and evaporates to become water vapor, then enters a heat pump condenser, releases heat and condenses, then enters a heat pump evaporator after being pressurized by a first booster pump, then enters an absorber after absorbing heat and evaporating in the heat pump evaporator, the lithium bromide solution in the generator becomes a concentrated solution, then enters a heat pump regenerator after being pressurized by a second booster pump, then enters an absorber after absorbing heat in the heat pump evaporator, at which time the lithium bromide solution is mixed with water vapor to become a dilute lithium bromide solution, releases heat, then enters the heat pump regenerator, further releases heat, then is depressurized by an expansion valve, and then returns to the generator, completing a heat pump cycle; When the organic Rankine cycle unit is running, the low-temperature, low-pressure saturated liquid working medium passes through the third booster pump and enters the heat engine regenerator. After absorbing heat, it enters the absorber to absorb heat and evaporates to a vapor state. It then enters the expander to expand and do work, causing the temperature and pressure of the working medium to drop. It then enters the heat engine regenerator to release heat, enters the heat engine condenser, releases heat, and condenses to a low-temperature, low-pressure saturated liquid state, completing the organic Rankine cycle.

[0015] Compared with the prior art, the present invention has achieved the following technical effects: The present invention improves the quality of medium and low temperature geothermal sources through a heat pump circulation unit, thereby obtaining a heat source with a higher temperature, and then generates electricity through an organic Rankine cycle unit, so that the organic Rankine cycle unit can obtain higher power generation efficiency and have a higher output power density, thereby achieving efficient and reasonable utilization of medium and low temperature geothermal energy, and at the same time the system has high adjustment flexibility.

[0016] The heat pump circulation unit in the present invention can meet the user's low-temperature heating needs while improving the quality of geothermal heat, expand the application scenarios of the system, improve the comprehensive benefits of the system, maintain good thermal economy, and reduce waste in the energy conversion process.

[0017] The heat regenerator provided in the present invention recovers and utilizes the waste heat in the circulation process, which is beneficial to reducing the irreversible loss of the system and improving the operating efficiency of the system.

[0018] The present invention adopts the organic Rankine cycle, which is an environmentally friendly technology that efficiently utilizes low-temperature thermal energy and converts it into electrical energy. It has a variety of working fluid options, wide applicability and simple system advantages. In addition, the cold source of the thermoelectric conversion cycle of the present invention is cold water, and there is no additional low-temperature cold storage device, which saves the cost of supporting cold storage equipment and related cold storage materials. It has a simple and compact structure and high cost performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0020] Figure numerals: 1. Generator; 2. Heat pump condenser; 3. First booster pump; 4. Heat pump evaporator; 5. Absorber; 6. Heat pump regenerator; 7. Expansion valve; 8. Second booster pump; 9. Expansion machine; 10. Heat engine regenerator; 11. Heat engine condenser; 12. Third booster pump; 13. Cooling tower; 14. Geothermal source; 15. Secondary heating network. DETAILED DESCRIPTION

[0021] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0022] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0023] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0024] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0026] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0027] It should also be understood that the terms used in the present specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the present specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0028] It should be further understood that the term "and / or" used in the present description and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0029] Various structural schematic diagrams of the embodiments disclosed in the present invention are shown in the accompanying drawings. These figures are not drawn to scale, and some details are magnified and some details may be omitted for the purpose of clear expression. The shapes of various regions and layers shown in the figures and the relative sizes and positional relationships therebetween are only exemplary, and may deviate in practice due to manufacturing tolerances or technical limitations, and those skilled in the art may additionally design regions / layers with different shapes, sizes, and relative positions according to actual needs.

[0030] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0031] like Figure 1As shown, the present invention is a combined heat and power system of a geothermal absorption heat pump coupled with an organic Rankine cycle, comprising a connected heat pump cycle unit and an organic Rankine cycle unit; the heat pump cycle unit comprises a generator 1, a heat pump condenser 2, a heat pump evaporator 4, an absorber 5 and a heat pump regenerator 6; the cold phase outlet and the solution outlet of the generator 1 are respectively connected to the hot phase inlet of the heat pump condenser 2 and the cold phase inlet of the heat pump regenerator 6, the cold phase outlet of the heat pump regenerator 6 is connected to the hot phase solution inlet of the absorber 5, the hot phase outlet of the absorber 5 is connected to the hot phase inlet of the heat pump regenerator 6, and the heat pump regenerator 6 is connected to the cold phase inlet of the generator 1. The hot phase outlet of the heat pump condenser 2 is connected to the cold phase inlet of the heat pump evaporator 4, and the cold phase outlet of the heat pump evaporator 4 is connected to the hot phase inlet of the absorber 5; the organic Rankine cycle unit includes an expander 9, a heat engine regenerator 10 and a heat engine condenser 11; the cold phase outlet of the heat engine regenerator 10 is connected to the cold phase inlet of the absorber 5, the cold phase outlet of the absorber 5 is connected to the inlet of the expander 9, the outlet of the expander 9 is connected to the hot phase inlet of the heat engine regenerator 10, the hot phase outlet of the heat engine regenerator 10 is connected to the hot phase inlet of the heat engine condenser 11, and the hot phase outlet of the heat engine condenser 11 is connected to the cold phase inlet of the heat engine regenerator 10. The embodiment is provided with two subsystems, namely a heat pump circulation unit and an organic Rankine cycle unit. The heat pump circulation unit adopts lithium bromide solution as the working fluid, which can upgrade the quality and temperature of medium and low temperature geothermal energy to obtain a higher temperature heat source. At the same time, it can generate a low temperature heat source to meet the heating needs of users. The working fluid of the organic Rankine cycle passes through the heat exchange flow channel arranged in the absorber 5 of the heat pump, and utilizes the high temperature heat source generated by the heat pump to generate electricity, thereby realizing cogeneration of heat and power.

[0032] The heat engine condenser 11 also includes a cooling tower 13, and the cold phase end of the heat engine condenser 11 is connected to the cooling tower 13. In the embodiment, the cooling tower 13 is used to release the heat of the heat engine condenser 11, which is conducive to full utilization of the heat, thereby improving the overall heat utilization rate of the system.

[0033] It also includes a geothermal source 14, the hot phase end of the generator 1 is connected to the geothermal source 14, and the hot phase end of the heat pump evaporator 4 is connected to the geothermal source 14; the input temperature of the geothermal source 14 is 90° C., and the output temperature is 80° C. The geothermal source 14 in the embodiment is used to provide heat to the generator 1 and the heat pump evaporator 4, and the temperature set by the geothermal source 14 meets the actual heating conditions and heating needs.

[0034] It also includes a heating secondary pipe network 15, and the cold phase end of the heat pump condenser 2 is connected to the heating secondary pipe network 15; the inlet temperature of the heating secondary pipe network 15 is 50° C., and the outlet temperature is 35° C. In the embodiment, the heating secondary pipe network 15 is used to provide heat to the heat pump condenser 2. The temperature set by the heating secondary pipe network 15 meets the actual heating conditions and heating needs, which is conducive to the implementation of the project.

[0035] A first booster pump 3 is provided between the hot phase outlet of the heat pump condenser 2 and the cold phase inlet of the heat pump evaporator 4; a second booster pump 8 is provided between the solution outlet of the generator 1 and the cold phase inlet of the heat pump regenerator 6; a third booster pump 12 is provided between the hot phase outlet of the heat engine condenser 11 and the cold phase inlet of the heat engine regenerator 10; an expansion valve 7 is provided between the heat pump regenerator 6 and the cold phase inlet of the generator 1.

[0036] The hot phase inlet temperature of the generator 1 is 79°C, and the hot phase outlet temperature is 74°C; the reaction temperature of the absorber 5 is 135°C, and the pressure is 38.6 kPa. The parameters of the generator 1 and the absorber 5 in the embodiment are the preferred parameters obtained after optimization, which is conducive to more efficient operation of the heat pump and better performance.

[0037] The solution in the generator 1 is a lithium bromide solution, the mass fraction of the solution inlet of the generator 1 is 57%, and the mass fraction of the solution outlet is 60%. In the embodiment, the lithium bromide solution is a circulating working fluid of the heat pump circulation unit. The use of this working fluid is conducive to obtaining a higher absorption temperature and generating a higher temperature heat source. At the same time, the lithium bromide aqueous solution has strong absorption capacity and good chemical stability, which is conducive to the safe and stable operation of the system.

[0038] The compression ratio of the first booster pump 3 and the first booster pump 3 is 2.5, the expansion ratio of the expansion valve 7 is 2.5, the compression ratio of the third booster pump 12 is 8.4, and the expansion ratio of the expander 9 is 8.4. The operating parameters in the embodiment are the preferred parameters obtained after optimization, which are conducive to improving the working efficiency of the system; this embodiment can adjust the flow rate and output temperature of the heating secondary pipe network 15 and the output temperature of the absorber 5 by changing the geothermal water flow rate and the compression ratio of the first booster pump 3 and the second booster pump and the expansion ratio of the expansion valve 7, thereby adjusting the power generation power of the organic Rankine cycle and realizing the adjustment of the heating and power generation ratio of the system. This is conducive to meeting the heat and electricity load requirements under different scenarios and conditions.

[0039] The circulating working fluid of the organic Rankine cycle unit is R1233zd(E). This working fluid has a high critical temperature and is environmentally friendly, efficient, safe, stable and highly applicable, which is conducive to the efficient and stable operation of the system.

[0040] When the present invention is used, when the heat pump circulation unit is running, the water in the lithium bromide solution in the generator 1 absorbs heat and evaporates into water vapor, then enters the heat pump condenser 2, releases heat and condenses, then enters the heat pump evaporator 4 after being pressurized by the first booster pump 3, then enters the absorber 5 after absorbing heat and evaporating in the heat pump evaporator 4, the lithium bromide solution in the generator 1 becomes a concentrated solution, then enters the heat pump regenerator 6 after being pressurized by the second booster pump, then enters the absorber 5 after absorbing heat in the heat pump evaporator 4, at this time, the lithium bromide solution is mixed with water vapor to form a dilute lithium bromide solution, releases heat, then enters the heat pump regenerator 6, further releases heat, then returns to the generator 1 after being depressurized by the expansion valve 7, and completes the heat pump cycle; When the organic Rankine cycle unit is running, the low-temperature and low-pressure saturated liquid working medium is compressed to a low-temperature and high-pressure supercooled liquid state by the third booster pump 12, and then enters the heat engine regenerator 10. After absorbing heat and the temperature rises, it enters the absorber 5 to absorb heat and evaporate to a high-temperature and high-pressure superheated vapor state, and then enters the expander 9 to expand and do work, so that the temperature and pressure of the working medium drops, and then enters the heat engine regenerator 10 to release heat, and enters the heat engine condenser 11 to release heat and condense to a low-temperature and low-pressure saturated liquid state, completing the organic Rankine cycle.

[0041] When the system is operated as described above, when the inlet flow rate of the generator 1 is 10 kg / s, the flow rate of the geothermal source 14 is 61 kg / s, the working fluid flow rate of the organic Rankine cycle is 17 kg / s, the flow rate of the secondary heating network 15 is 6.5 kg / s, and the cold water flow rate of the cooling tower 13 is 85 kg / s. At this time, the net output power of the organic Rankine cycle is 588 kW, which achieves a precise match between the heat supply of the heat pump and the heat consumption of the organic Rankine cycle, which is beneficial to the improvement of the overall thermal efficiency.

[0042] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the attached claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0043] In addition, it should be understood that although this specification is described in accordance with the implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation modes that can be understood by those skilled in the art. The above content is only to illustrate the technical idea of ​​the present invention, and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution according to the technical idea proposed by the present invention shall fall within the protection scope of the claims of the present invention.

Claims

1. A combined heat and power system of a geothermal absorption heat pump coupled with an organic Rankine cycle, characterized in that: It includes a connected heat pump cycle unit and an organic Rankine cycle unit; The heat pump circulation unit comprises a generator (1), a heat pump condenser (2), a heat pump evaporator (4), an absorber (5) and a heat pump regenerator (6); The cold phase outlet and solution outlet of the generator (1) are respectively connected to the hot phase inlet of the heat pump condenser (2) and the cold phase inlet of the heat pump regenerator (6); the cold phase outlet of the heat pump regenerator (6) is connected to the hot phase solution inlet of the absorber (5); the hot phase outlet of the absorber (5) is connected to the hot phase inlet of the heat pump regenerator (6); the heat pump regenerator (6) is connected to the cold phase inlet of the generator (1); the hot phase outlet of the heat pump condenser (2) is connected to the cold phase inlet of the heat pump evaporator (4); and the cold phase outlet of the heat pump evaporator (4) is connected to the hot phase inlet of the absorber (5); The organic Rankine cycle unit comprises an expander (9), a heat engine regenerator (10) and a heat engine condenser (11); The cold phase outlet of the heat engine regenerator (10) is connected to the cold phase inlet of the absorber (5), the cold phase outlet of the absorber (5) is connected to the inlet of the expander (9), the outlet of the expander (9) is connected to the hot phase inlet of the heat engine regenerator (10), the hot phase outlet of the heat engine regenerator (10) is connected to the hot phase inlet of the heat engine condenser (11), and the hot phase outlet of the heat engine condenser (11) is connected to the cold phase inlet of the heat engine regenerator (10).

2. According to claim 1, a combined heat and power system of a geothermal absorption heat pump coupled with an organic Rankine cycle, characterized in that: It also includes a cooling tower (13), and the cold phase end of the heat engine condenser is connected to the cooling tower.

3. According to claim 1, a combined heat and power system of a geothermal absorption heat pump coupled with an organic Rankine cycle, characterized in that: It also includes a geothermal source (14), the hot phase end of the generator (1) is connected to the geothermal source (14), and the hot phase end of the heat pump evaporator (4) is connected to the geothermal source (14); The input temperature of the geothermal source (14) is 90°C and the output temperature is 80°C.

4. According to claim 1, a combined heat and power system of a geothermal absorption heat pump coupled with an organic Rankine cycle, characterized in that: It also includes a secondary heating pipe network (15), and the cold phase end of the heat pump condenser (2) is connected to the secondary heating pipe network (15); The inlet temperature of the secondary heating network (15) is 50°C, and the outlet temperature is 35°C.

5. The combined heat and power system of a geothermal absorption heat pump coupled with an organic Rankine cycle according to claim 1, characterized in that: A first booster pump (3) is provided between the hot phase outlet of the heat pump condenser (2) and the cold phase inlet of the heat pump evaporator (4); A second boosting pump (8) is provided between the solution outlet of the generator (1) and the cold phase inlet of the heat pump regenerator (6); A third booster pump (12) is provided between the hot phase outlet of the heat engine condenser (11) and the cold phase inlet of the heat engine regenerator (10); An expansion valve (7) is provided between the heat pump regenerator (6) and the cold phase inlet of the generator (1).

6. The combined heat and power system of a geothermal absorption heat pump coupled with an organic Rankine cycle according to claim 1, characterized in that: The generator (1) has a hot phase inlet temperature of 79°C and a hot phase outlet temperature of 74°C; The reaction temperature of the absorber (5) is 135°C and the pressure is 38.6 kPa.

7. The combined heat and power system of a geothermal absorption heat pump coupled with an organic Rankine cycle according to claim 1, characterized in that: The solution in the generator is a lithium bromide solution, the mass fraction of the solution at the generator inlet is 57%, and the mass fraction of the solution at the solution outlet is 60%.

8. The combined heat and power system of a geothermal absorption heat pump coupled with an organic Rankine cycle according to claim 5, characterized in that: The compression ratios of the first booster pump (3) and the first booster pump (8) are 2.5, the expansion ratio of the expansion valve (7) is 2.5, the compression ratio of the third booster pump is 8.4, and the expansion ratio of the expander (9) is 8.

4.

9. The combined heat and power system of a geothermal absorption heat pump coupled with an organic Rankine cycle according to claim 1, characterized in that: The circulating working fluid of the organic Rankine cycle unit is R1233zd(E).

10. The method of a combined heat and power system of a geothermal absorption heat pump coupled with an organic Rankine cycle according to any one of claims 1 to 9, characterized in that: When the heat pump circulation unit is in operation, water in the lithium bromide solution in the generator (1) absorbs heat and evaporates to become water vapor, then enters the heat pump condenser (2), releases heat and condenses, enters the heat pump evaporator (4) after being pressurized by the first booster pump (3), absorbs heat and evaporates in the heat pump evaporator (4), then enters the absorber (5), the lithium bromide solution in the generator (1) becomes a concentrated solution, then enters the heat pump regenerator (6) after being pressurized by the second booster pump (8), then enters the absorber (5), and at this time, the lithium bromide solution is mixed with the water vapor to become a dilute lithium bromide solution, releases heat, and then enters the heat pump regenerator (6), further releases heat, then is depressurized by the expansion valve (7), and then returns to the generator (1), completing the heat pump cycle; When the organic Rankine cycle unit is in operation, the low-temperature, low-pressure saturated liquid working medium passes through the third booster pump (12) and enters the heat engine regenerator (10), absorbs heat, enters the absorber (5) to absorb heat and evaporates to a vapor state, then enters the expander (9) to expand and perform work, causing the temperature and pressure of the working medium to drop, then enters the heat engine regenerator (10) to release heat, enters the heat engine condenser (11), releases heat and condenses to a low-temperature, low-pressure saturated liquid state, thereby completing the organic Rankine cycle.

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