Water intake type geothermal cascade utilization system combined with power plant heat supply first station

Abstract

The utility model relates to a kind of water-taking type geothermal cascade utilization system combined with power plant heat supply first station. Including water well, recharge well, lithium bromide heat exchange unit, steam type absorption heat pump and heat network heater, water well is connected generator of lithium bromide heat exchange unit, heat exchanger, evaporator, steam type absorption heat pump unit's heat pump evaporator and recharge well in proper order;Heat network backwater pipe is divided into two ways, one is connected absorber and condenser of lithium bromide heat exchange unit in proper order, while parallel heat exchanger of lithium bromide heat exchange unit;The other way is connected heat pump absorber and heat pump condenser of steam type absorption heat pump unit, two ways are connected heat network heater after confluence;Steam type absorption heat pump uses double-effect absorption heat pump system, steam type absorption heat pump's high-temperature generator and heat network heater connect power plant high-temperature steam extraction pipeline, can satisfy the demand of improving comprehensive energy utilization rate, clean heating.

Description

Technical Field

[0001] This utility model relates to the field of clean energy heating technology, and in particular to a water intake-type geothermal cascade utilization system that is integrated with the first heating station of a power plant. Background Technology

[0002] Traditional centralized heating systems, primarily powered by coal, face challenges such as high energy consumption, high carbon emissions, and environmental pollution (e.g., dust, SO2, NOx). Utilizing geothermal wells to extract medium-deep (typically >2000 meters) geothermal water offers significant resource potential, stable operation, and minimal pollution, making it an important clean heat source. However, its application has significant limitations: geothermal tailwater temperatures are typically still high (e.g., 40-60℃ or even higher), and direct discharge or reinjection results in a significant waste of medium- and low-temperature heat energy, reducing the overall energy efficiency and economic benefits of the system. Furthermore, these systems are mostly independent distributed systems, using electrically driven heat pumps for energy cascade utilization, without integration with centralized heating, leading to low utilization rates and wasted energy.

[0003] Absorption heat pump technology offers an effective solution to the problem of utilizing low-grade thermal energy. This technology utilizes a high-temperature driving heat source (such as steam or hot water) to extract heat from a low-temperature heat source (such as ambient medium or waste heat), producing higher-temperature usable thermal energy. Its core value lies in achieving "grade enhancement" of thermal energy. Theoretically, medium-deep geothermal tailwater is an ideal low-temperature heat source for absorption heat pumps. However, the efficient operation of absorption heat pumps requires a stable and appropriately priced driving heat source. While conventional gas or electric drives are feasible, they represent higher energy grades and do not fully realize the advantages of clean heating. Meanwhile, lithium bromide heat exchanger technology significantly increases primary-side cooling capacity compared to traditional heat exchangers. It is also a key device with large heat exchange capacity and energy-saving capabilities, but its application is often limited to the end of centralized, large-temperature-difference heating networks.

[0004] In the field of district heating, large coal-fired or gas-fired power plants (especially combined heat and power plants) are important heat sources. Their conventional heating method mainly involves extracting steam from steam turbines and using this steam to heat the return water of the heating network. This mode avoids the greater cold source loss under pure condensing conditions and reduces absolute energy waste compared to heating with electricity generated directly from power plants. However, this mode is a simple heat conversion, and there is still considerable room for improvement in its heating potential, such as using heat pump technology to extract low-grade heat.

[0005] The existing patent CN220169526U provides a high-efficiency heating and heat exchange system for medium-deep geothermal energy. High-temperature geothermal water passes through a primary geothermal heat exchanger, producing high-temperature circulating water that is directly supplied to the heating water supply pipe. The tailwater from the primary heat exchange passes through a secondary heat exchanger, providing intermediate circulating water to the lithium bromide unit. High-temperature steam passes through a steam-water heat exchanger, producing high-temperature circulating water that is directly supplied to the heating water supply pipe. Simultaneously, the high-temperature steam enters the lithium bromide unit, driving it to perform secondary energy extraction. This energy conversion only consumes the electricity required for the lithium bromide heat pump unit's own operation; the heat from the high-temperature steam is also incorporated into the system. By utilizing high-temperature steam generated by a power plant to drive the lithium bromide unit, it consumes minimal electrical energy, only the electricity required for the heat pump unit's operation. The tailwater from the lithium bromide unit's cascade utilization can be further cooled by an electric heat pump, improving the utilization rate of deep geothermal wells; it can achieve lower reinjection temperatures and focuses more on improving geothermal energy utilization, but requires additional electricity consumption.

[0006] Therefore, there is an urgent need for an innovative system integration solution that can overcome the limitations of the aforementioned individual technologies. Utility Model Content

[0007] The purpose of this utility model is to provide a solution that meets the needs of practical engineering, combines the thermal system of a power plant, and utilizes lithium bromide heat exchanger units and steam-type absorption heat pump technology to achieve efficient cascade utilization of medium-deep geothermal energy for heating.

[0008] To achieve the above objectives, this utility model employs the following technical solution: a water intake-type geothermal cascade utilization system integrated with the primary heating station of a power plant, comprising a water intake well, a reinjection well, a lithium bromide heat exchanger unit, a steam-type absorption heat pump, and a heat network heater. The water intake well is sequentially connected to the generator, heat exchanger, and evaporator of the lithium bromide heat exchanger unit, the heat pump evaporator of the steam-type absorption heat pump unit, and the reinjection well. The heat network return water pipe is divided into two paths: one path is sequentially connected to the absorber and condenser of the lithium bromide heat exchanger unit, and simultaneously connected in parallel to the heat exchanger of the lithium bromide heat exchanger unit; the other path is connected to the heat pump absorber and heat pump condenser of the steam-type absorption heat pump unit. The two paths merge and are then connected to the heat network heater. The steam-type absorption heat pump generator is connected to a high-temperature steam extraction pipeline from the power plant.

[0009] Furthermore, the geothermal water side draws high-temperature water from the intake well.

[0010] Furthermore, the power plant's high-temperature steam extraction pipeline connects to the intermediate-pressure cylinder and the low-pressure cylinder via a connecting pipe.

[0011] Furthermore, the lithium bromide heat exchanger unit includes a heat exchanger and a hot water type lithium bromide chiller. The hot water type lithium bromide chiller includes a condenser, a hot water generator, an absorber, an evaporator, and a solution heat exchanger. The high-temperature geothermal water pipeline from the intake well is connected to the hot water generator. The water-side outlet of the hot water generator is connected in sequence to the hot side of the heat exchanger and the evaporator. The concentrated solution after evaporation from the hot water generator enters the solution inlet of the absorber through a throttling device. The dilute solution outlet of the absorber is connected to the solution heat exchanger via a working fluid pump and then to the solution inlet of the hot water generator. The steam outlet after evaporation from the hot water generator is connected to the steam inlet of the condenser. The refrigerant water outlet of the condenser is connected to the refrigerant water inlet of the evaporator. The steam outlet of the evaporator is connected to the steam inlet of the absorber. One branch of the heat network water return pipeline connects the water side of the absorber and the condenser. The water-side outlet of the condenser is connected to the heat network water supply pipeline and also to the cold side of the heat exchanger.

[0012] Furthermore, the steam-type absorption heat pump unit includes a high-temperature generator, a low-temperature generator, a heat pump absorber, a heat pump evaporator, a heat pump condenser, a high-temperature solution heat exchanger, and a low-temperature solution heat exchanger. The hot side of the high-temperature generator and the high-temperature solution heat exchanger, and the heat pump absorber are connected in sequence. The solution outlet of the heat pump absorber is connected to the cold side of the high-temperature solution heat exchanger and the solution inlet of the high-temperature generator. The solution outlet of the heat pump absorber is also connected in sequence to the cold side of the low-temperature solution heat exchanger and the solution inlet of the low-temperature generator. The hot side of the low-temperature generator, the hot side of the low-temperature solution heat exchanger, and the heat pump absorber are connected in sequence. The high-temperature generator, the low-temperature generator, the heat pump condenser, the heat pump evaporator, and the heat pump absorber are all connected in sequence. The other branch of the heating network water return pipe is connected to the heat pump absorber and the heat pump condenser respectively. On the water side, the geothermal water flowing out of the lithium bromide heat exchanger enters the evaporator to release heat and cool down again. The heating network water return flows through the heat pump condenser and the heat pump absorber to absorb heat. On the solution side, the dilute lithium bromide solution in the high-temperature generator and the low-temperature generator absorbs heat and is heated to become a concentrated solution. It enters the heat pump absorber through the high-temperature solution heat exchanger and the low-temperature solution heat exchanger respectively. At the same time, refrigerant vapor is generated. The refrigerant vapor enters the heat pump condenser, releases heat and condenses into refrigerant water, which enters the heat pump evaporator. The refrigerant water absorbs heat and evaporates into low-temperature refrigerant vapor in the heat pump evaporator. The low-temperature refrigerant vapor then enters the heat pump absorber and is absorbed by the concentrated solution to release heat.

[0013] Furthermore, during operation, the lithium bromide heat exchanger and the steam-type absorption heat pump always operate at full load in the system to extract geothermal energy to the maximum extent, and the heat supply of the heating network is only regulated by the heating network heater.

[0014] Furthermore, temperature monitoring devices are installed at the generator inlet, evaporator outlet, absorber inlet, condenser outlet, reinjection well inlet, heating network heater inlet and outlet, and heating network return water pipe of the lithium bromide heat exchanger unit.

[0015] Furthermore, temperature monitoring devices are installed at the inlet and outlet of the heat pump absorber and heat pump condenser of the steam absorption heat pump unit, as well as at the inlet and outlet of the heat pump evaporator of the steam absorption heat pump unit.

[0016] Furthermore, regulating valves are installed on the pipelines from the power plant's high-temperature steam extraction pipeline to the generator of the steam-type absorption heat pump and the heating network heater.

[0017] Furthermore, regulating valves are installed on both pipes of the heating network return water pipe.

[0018] Compared with existing technologies, this utility model has the following advantages: The lithium bromide heat exchanger unit is driven by geothermal energy. After the geothermal energy quality is reduced, it is further utilized by a steam-type absorption heat pump. The steam-type absorption heat pump is driven by steam extracted from a coal-fired unit, which can achieve high-quality energy without waste. Geothermal energy is utilized in stages through the lithium bromide heat exchanger unit and the steam-type absorption heat pump, reducing energy waste in geothermal tailwater and increasing the heating capacity of geothermal energy. The lithium bromide heat exchanger unit and the steam-type absorption heat pump unit serve as the first stage of heating in the heating network, always operating at full load, with high efficiency and unaffected by seasons. The heating of the heating network can be adjusted by the steam extraction rate of the peak heater to ensure the stability of heating. The driving heat source of the steam-type absorption heat pump is the steam extracted from the connecting pipe. This part of the extracted steam is steam extracted by the high-pressure cylinder and the intermediate-pressure cylinder, which is conventional heating steam quality, unlike electric drive, which has quality waste. Furthermore, regardless of the amount of heat extracted from the steam, it is released back into the heat network, therefore the system can be considered unaffected by the efficiency of the heat pump unit.

[0019] Furthermore, during operation, the lithium bromide heat exchanger and the steam-type absorption heat pump always operate at full load in the system to extract geothermal energy to the maximum extent, and the heat supply of the heating network is only regulated by the heating network heater. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of an implementable water intake geothermal cascade utilization system according to the present invention. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0022] This application provides an integrated heating system that utilizes medium-deep geothermal energy in a cascade manner through lithium bromide heat exchangers and steam-type absorption heat pumps, and integrates it with the primary heating station of a power plant. It comprehensively utilizes water-intake-type medium-deep geothermal extraction technology, lithium bromide heat exchangers, steam-type absorption heat pumps, and heat network heat exchange technology to solve the problems mentioned in the background technology. The driving heat of the large temperature difference heat exchanger is geothermal energy, and this equipment can reduce the geothermal water to a low level in the first stage. The second-stage absorption heat pump reduces the geothermal water to an even lower level, with no electrical energy consumed throughout the entire process. The heat network water undergoes a first-stage heating process through these two devices, and after merging, it enters the heat network heater for a second-stage heating process. The heating load is regulated solely by the second stage, allowing the preceding equipment to operate at full load.

[0023] like Figure 1 As shown, the geothermal cascade utilization system for water intake combined with the primary heating station of a power plant provided by this utility model includes three circulation paths. The dashed lines represent geothermal water branches, the solid lines represent heating hot water branches, and the dotted lines represent steam branches. The system includes: an intake well, a reinjection well, a lithium bromide heat exchanger unit, a steam-type absorption heat pump, and a heat network heater. The steam-type absorption heat pump adopts a two-stage absorption heat pump system. The intake well is sequentially connected to the generator, heat exchanger, and evaporator of the lithium bromide heat exchanger unit, the heat pump evaporator of the steam-type absorption heat pump unit, and the reinjection well. The heat network return water pipe is divided into two paths. One path is sequentially connected to the absorber and condenser of the lithium bromide heat exchanger unit, and the heat exchanger of the lithium bromide heat exchanger unit is connected in parallel. The other path is connected to the heat pump absorber and heat pump condenser of the steam-type absorption heat pump unit. The two paths merge and are then connected to the heat network heater. The high-temperature generator of the steam-type absorption heat pump and the heat network heater are connected to the high-temperature steam extraction pipeline of the power plant.

[0024] Geothermal water is extracted from the well and enters the lithium bromide heat exchanger unit, then proceeds to a steam-type absorption heat pump unit. Within the lithium bromide heat exchanger unit, the extracted high-temperature geothermal water first enters the generator as driving heat, then flows into its plate heat exchanger to exchange heat with the return water from the heating network. After its temperature decreases, it enters the evaporator for further cooling, ultimately exiting the lithium bromide heat exchanger unit at approximately 43°C. After exiting the lithium bromide heat exchanger unit, the geothermal water then enters the evaporator of the steam-type absorption heat pump unit. Utilizing steam as the driving heat source, the geothermal water temperature is further reduced to approximately 17°C. Finally, the 17°C geothermal tailwater is reinjected.

[0025] The lithium bromide heat exchanger unit includes a heat exchanger and a hot water type lithium bromide chiller. The hot water type lithium bromide chiller includes a condenser, a hot water generator, an absorber, an evaporator, and a solution heat exchanger. High-temperature geothermal water pipelines connect to the hot water generator. The water-side outlet of the hot water generator is sequentially connected to the hot side of the heat exchanger, the evaporator, and the reinjection well. The concentrated solution after evaporation from the hot water generator enters the absorber solution inlet through a throttling device. The dilute solution outlet of the absorber is connected to the solution heat exchanger via a working fluid pump, which in turn connects to the hot water generator solution inlet. The steam outlet after evaporation from the hot water generator connects to the condenser steam inlet. The refrigerant water outlet of the condenser connects to the evaporator refrigerant water inlet, and the steam outlet of the evaporator connects to the absorber steam inlet. One branch of the heating network water return pipeline connects to the water side of the absorber and condenser. The condenser water-side outlet connects to the heating network supply pipeline and also to the cold side of the plate heat exchanger. For the water side, high-temperature geothermal water first passes through a hot water generator as a driving heat source for primary heat release and cooling, then through a heat exchanger for secondary heat release and cooling, and finally through an evaporator for tertiary heat release and cooling before being injected into the reinjection well. The return water from the heating network enters the secondary side (cold side) of the plate heat exchanger and the absorber and condenser in two separate streams to absorb heat, before converging and flowing out. For the solution side, the dilute lithium bromide solution in the generator absorbs heat and heats to become a concentrated solution, which then enters the absorber through a solution heat exchanger, simultaneously generating refrigerant vapor. The refrigerant vapor enters the condenser, releases heat, and condenses into refrigerant water, which enters the evaporator. The refrigerant water absorbs heat in the evaporator and evaporates into low-temperature refrigerant vapor, which then enters the absorber where it is absorbed and released heat by the concentrated solution. The heat exchangers used are plate heat exchangers.

[0026] A steam-type absorption heat pump includes a high-temperature generator, a low-temperature generator, a heat pump absorber, a heat pump evaporator, a heat pump condenser, a high-temperature solution heat exchanger, and a low-temperature solution heat exchanger. The high-temperature generator, the hot side of the high-temperature solution heat exchanger, and the heat pump absorber are connected sequentially. The solution outlet of the heat pump absorber is connected to the cold side of the high-temperature solution heat exchanger and the solution inlet of the high-temperature generator. The solution outlet of the heat pump absorber is also connected sequentially to the cold side of the low-temperature solution heat exchanger and the solution inlet of the low-temperature generator. The hot side of the low-temperature generator, the hot side of the low-temperature solution heat exchanger, and the heat pump absorber are connected sequentially. The high-temperature generator, the low-temperature generator, the heat pump condenser, the heat pump evaporator, and the heat pump absorber are also connected sequentially. Another branch of the heating network water return pipeline is connected to the heat pump absorber and the heat pump condenser. The high-temperature generator is driven by steam. On the water side, geothermal water flowing from the lithium bromide heat exchanger enters the evaporator to release heat and cool down again. The heating network water return flows through the heat pump condenser and the heat pump absorber to absorb heat. On the solution side, the dilute lithium bromide solution in the high-temperature and low-temperature generators absorbs heat and heats to become a concentrated solution. This concentrated solution then passes through the high-temperature and low-temperature solution heat exchangers respectively before entering the heat pump absorber, simultaneously generating refrigerant vapor. The refrigerant vapor enters the heat pump condenser, releases heat, and condenses into refrigerant water, which then enters the heat pump evaporator. The refrigerant water absorbs heat and evaporates into low-temperature refrigerant vapor in the evaporator. This low-temperature refrigerant vapor then enters the heat pump absorber where it is absorbed by the concentrated solution, releasing heat.

[0027] The return water temperature of the heating network is approximately 50℃. The return water is divided into two parts. One part enters a lithium bromide heat exchanger unit, where it undergoes heat exchange in a plate heat exchanger, absorber, and condenser. The other part sequentially enters the absorber and condenser of a steam-type absorption heat pump unit to raise its temperature. After the two parts of hot water are mixed, they enter the peak heater, i.e., the heating network heater, for further temperature increase. Once the heating requirements are met, the hot water is then sent to the heating network.

[0028] The steam branch first extracts steam from the connecting pipe between the intermediate-pressure cylinder and the low-pressure cylinder (or the fifth extraction steam for heating in the turbine of the cogeneration unit). Part of the extracted steam enters the steam-type absorption heat pump unit as a driving heat source, and the other part enters the series-connected peak heaters to make the hot water supply reach the required temperature.

[0029] The circulating water in the heating network is heated to about 60°C by parallel lithium bromide heat exchangers and steam-type absorption heat pumps, and then connected in series with peak heaters to reach the hot water temperature required for centralized heating.

[0030] After being drawn from the intake well, the geothermal water first enters a lithium bromide heat exchanger unit, serving as a high-temperature heat source for its initial utilization. The heat exchanged heats the circulating water side of the heating network. After this initial cooling process in the lithium bromide heat exchanger unit, the geothermal water becomes low-temperature water at approximately 43°C. Next, this cooled water, acting as a low-temperature heat source, is driven by steam extracted from the connecting pipe (or other parts of the combined heat and power unit's turbine) into a steam-type absorption heat pump unit. This further cooling of the low-temperature water achieves cascaded utilization of the geothermal energy, reducing waste heat. Finally, the geothermal tailwater, at approximately 17°C, is reinjected, completing the geothermal water circulation.

[0031] This application organically combines the low-grade waste heat resources of medium-deep geothermal tailwater with the surplus high-grade steam (or its converted high-temperature hot water) from power plants. Using lithium bromide heat exchangers and absorption heat pumps as the core link, it can efficiently recover and enhance the heat of geothermal tailwater without consuming too much electricity, forming an efficient heating mode with energy cascade utilization. This significantly improves the overall energy utilization efficiency, heating capacity, and clean and low-carbon level of the entire system.

[0032] The above content is only for illustrating the technical concept of this utility model and should not be construed as limiting the scope of protection of this utility model. Any modifications made to the technical solution based on the technical concept proposed in this utility model shall fall within the scope of protection of the claims of this utility model.

Claims

1. A water intake-type geothermal cascade utilization system integrated with the primary heating station of a power plant, characterized in that, The system includes an intake well, a reinjection well, a lithium bromide heat exchanger unit, a steam-type absorption heat pump, and a heating network heater. The intake well is sequentially connected to the generator, heat exchanger, and evaporator of the lithium bromide heat exchanger unit, the heat pump evaporator of the steam-type absorption heat pump unit, and the reinjection well. The heating network return water pipe is divided into two paths. One path is sequentially connected to the absorber and condenser of the lithium bromide heat exchanger unit, and the heat exchanger of the lithium bromide heat exchanger unit is connected in parallel. The other path is connected to the heat pump absorber and heat pump condenser of the steam-type absorption heat pump unit. The two paths merge and are then connected to the heating network heater. The steam-type absorption heat pump adopts a double-effect absorption heat pump system. The high-temperature generator and heating network heater of the steam-type absorption heat pump are connected to the high-temperature steam extraction pipeline of the power plant.

2. The geothermal cascade utilization system with water intake combined with the primary heating station of a power plant as described in claim 1, characterized in that: The water in the well is at high temperature.

3. The water intake-type geothermal cascade utilization system combined with the primary heating station of a power plant as described in claim 1, characterized in that: The power plant's high-temperature steam extraction pipeline connects the intermediate-pressure cylinder to the low-pressure cylinder.

4. The geothermal cascade utilization system with water intake combined with the primary heating station of a power plant as described in claim 1, characterized in that: The lithium bromide heat exchanger unit includes a heat exchanger and a hot water type lithium bromide chiller. The hot water type lithium bromide chiller includes a condenser, a hot water generator, an absorber, an evaporator, and a solution heat exchanger. The high-temperature geothermal water pipeline from the intake well is connected to the hot water generator. The water-side outlet of the hot water generator is connected in sequence to the hot side of the heat exchanger and the evaporator. The concentrated solution after evaporation from the hot water generator enters the solution inlet of the absorber through a throttling device. The dilute solution outlet of the absorber is connected to the solution heat exchanger via a working fluid pump and then to the solution inlet of the hot water generator. The steam outlet after evaporation from the hot water generator is connected to the steam inlet of the condenser. The refrigerant water outlet of the condenser is connected to the refrigerant water inlet of the evaporator. The steam outlet of the evaporator is connected to the steam inlet of the absorber. One branch of the heat network water return pipeline connects the water side of the absorber and the condenser. The water-side outlet of the condenser is connected to the heat network water supply pipeline and also to the cold side of the heat exchanger.

5. The water intake-type geothermal cascade utilization system combined with the primary heating station of a power plant as described in claim 1, characterized in that: A vapor-type absorption heat pump unit includes a high-temperature generator, a low-temperature generator, a heat pump absorber, a heat pump evaporator, a heat pump condenser, a high-temperature solution heat exchanger, and a low-temperature solution heat exchanger. The hot side of the high-temperature generator and the high-temperature solution heat exchanger, and the heat pump absorber are connected in sequence. The solution outlet of the heat pump absorber is connected to the cold side of the high-temperature solution heat exchanger and the solution inlet of the high-temperature generator. The solution outlet of the heat pump absorber is also connected in sequence to the cold side of the low-temperature solution heat exchanger and the solution inlet of the low-temperature generator. The hot side of the low-temperature generator, the hot side of the low-temperature solution heat exchanger, and the heat pump absorber are connected in sequence. The high-temperature generator, the low-temperature generator, the heat pump condenser, the heat pump evaporator, and the heat pump absorber are connected in sequence. The other branch of the heating network water return pipeline is connected to the heat pump absorber and the heat pump condenser respectively. On the water side, the geothermal water flowing out of the lithium bromide heat exchanger enters the evaporator to release heat and cool down again. The heating network water return flows through the heat pump condenser and the heat pump absorber to absorb heat. On the solution side, the dilute lithium bromide solution in the high-temperature generator and the low-temperature generator absorbs heat and is heated to become a concentrated solution. It enters the heat pump absorber through the high-temperature solution heat exchanger and the low-temperature solution heat exchanger respectively, and at the same time, refrigerant vapor is generated. The refrigerant vapor enters the heat pump condenser, releases heat and condenses into refrigerant water, which enters the heat pump evaporator. The refrigerant water absorbs heat and evaporates into low-temperature refrigerant vapor in the heat pump evaporator. The low-temperature refrigerant vapor then enters the heat pump absorber and is absorbed by the concentrated solution to release heat.

6. The geothermal cascade utilization system with water intake in conjunction with the primary heating station of a power plant as described in claim 1, characterized in that: During operation, the lithium bromide heat exchanger and the steam-type absorption heat pump always operate at full load in the system.

7. The water intake-type geothermal cascade utilization system combined with the primary heating station of a power plant as described in claim 1, characterized in that: Temperature monitoring devices are installed at the evaporator outlet, reinjection well inlet, heating network heater inlet and outlet, and heating network return water pipe of the lithium bromide heat exchanger unit.

8. The water intake-type geothermal cascade utilization system combined with the primary heating station of a power plant as described in claim 1, characterized in that: Temperature monitoring devices are installed at the inlet and outlet of the heat pump absorber and heat pump condenser of the steam absorption heat pump unit, as well as at the inlet and outlet of the heat pump evaporator of the steam absorption heat pump unit.

9. The water intake-type geothermal cascade utilization system combined with the primary heating station of a power plant as described in claim 1, characterized in that: Regulating valves are installed on the pipelines from the power plant's high-temperature steam extraction pipeline to the generator of the steam-type absorption heat pump and the heating network heater.

10. The water intake-type geothermal cascade utilization system combined with the primary heating station of a power plant according to claim 1, characterized in that: Regulating valves are installed on both of the return water pipes of the heating network.

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