Middle-deep layer water taking type geothermal system combined with power plant condensation water heating and operation method

Abstract

A first water inlet pipe of a first titanium plate heat exchanger of the system is connected with a water taking well, a first water outlet pipe of the first titanium plate heat exchanger is connected with a first water inlet pipe of a second titanium plate heat exchanger, and a first water outlet pipe of the second titanium plate heat exchanger is connected with a recharge well. The second water outlet pipe is connected with a first water inlet pipe of a steam type lithium bromide heat pump unit, a first water outlet pipe of the steam type lithium bromide heat pump unit is connected with a second water inlet pipe of a second titanium plate type heat exchanger, and the second water inlet pipe is connected with a heat supply network water return pipe and a heat supply pipe. A second water inlet pipe of the first titanium plate type heat exchanger is connected with a heat supply network water return pipe, a second water outlet pipe is connected with a heat supply pipe, a third water outlet pipe of the steam type lithium bromide heat pump unit is connected with a drain cooler, and the first titanium plate type heat exchanger is connected with the drain cooler. And waste heat is fully recovered.

Description

Medium-deep geothermal system with condensate heating from power plants and its operation method Technical Field

[0001] This invention belongs to the field of clean energy heating technology, and relates to a medium-deep geothermal system that combines power plant condensate heating with a method for its operation. Background Technology

[0002] In thermal power generation and combined heat and power (CHP) systems, condensate heating is a core component for improving unit thermal cycle efficiency and reducing fuel consumption. This is achieved through the cascade utilization of high- and low-grade heat energy to raise the condensate temperature. Existing power plants use a series architecture of shaft seal heaters and condensate coolers. The shaft seal heaters utilize the high-grade heat energy from turbine shaft seal leakage steam as a heat source for primary condensate heating; the condensate coolers use condensate from the heating network heaters as a heat source for secondary heating, optimizing energy efficiency through heat energy gradient matching. However, in heating systems integrated with geothermal energy, the condensate coolers are not integrated with the driving steam condensate drain of the steam-type lithium bromide heat pump unit. The condensate cooler has a single heat source and is seasonally dependent. The heat pump unit only operates during the winter heating season, and after shutdown during the non-heating season, the condensate cooler is forced to sit idle. During the non-heating season, neither geothermal-related equipment nor the condensate cooler can operate, resulting in less than 50% effective operating time annually, leading to equipment waste. Summary of the Invention

[0003] To address the shortcomings of existing technologies, the present invention aims to provide a medium-deep geothermal system that combines power plant condensate heating with an operating method.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: The present invention provides a medium-deep geothermal system combining power plant condensate heating, comprising an intake well, a first titanium plate heat exchanger, a second titanium plate heat exchanger, a steam-type lithium bromide heat pump unit, and a reinjection well. The first inlet pipe of the first titanium plate heat exchanger is connected to the intake well, and the first outlet pipe is connected to the first inlet pipe of the second titanium plate heat exchanger. The first outlet pipe of the second titanium plate heat exchanger is connected to the reinjection well, and the second outlet pipe of the second titanium plate heat exchanger is connected to the first inlet pipe of the steam-type lithium bromide heat pump unit. The first outlet pipe of the steam-type lithium bromide heat pump unit is connected to the second inlet pipe of the second titanium plate heat exchanger. The second inlet pipe of the steam-type lithium bromide heat pump unit is connected to the return water pipe of the heating network. The second outlet pipe of the steam-type lithium bromide heat pump unit is connected to the heating pipe. The second inlet pipe of the first titanium plate heat exchanger is connected to the return water pipe of the heating network. The second outlet pipe of the first titanium plate heat exchanger is connected to the heating pipe. The steam inlet pipe of the steam-type lithium bromide heat pump unit is used to connect to the medium and low pressure cylinder connecting pipe. The third outlet pipe is connected to the condensate cooler. The first titanium plate heat exchanger is connected to the condensate cooler.

[0005] Furthermore, a first valve is provided between the second inlet pipe of the first titanium plate heat exchanger and the return water pipe of the heating network, and a second valve is provided between the second outlet pipe of the first titanium plate heat exchanger and the heating pipe.

[0006] Furthermore, a third valve is provided between the second outlet pipe of the first titanium plate heat exchanger and the first inlet pipe of the condensate cooler, and a fourth valve is provided between the first outlet pipe of the condensate cooler and the second inlet pipe of the first titanium plate heat exchanger.

[0007] Furthermore, it also includes a condenser, and a fifth valve is provided between the third outlet pipe of the steam-type lithium bromide heat pump unit and the first inlet pipe of the condensate cooler, and the first outlet pipe of the condensate cooler is connected to the condenser through a sixth valve.

[0008] Furthermore, the steam-type lithium bromide heat pump unit includes a high-pressure generator, a condenser, an evaporator, and an absorber.

[0009] Furthermore, the second inlet pipe of the second titanium plate heat exchanger is connected to the inlet of the evaporator, the outlet of the evaporator is connected to the second outlet pipe of the second titanium plate heat exchanger, the return water pipe of the heating network is connected to the inlet of the absorber, and the outlet of the condenser is connected to the heating pipe.

[0010] Furthermore, the steam inlet pipe of the high-pressure generator is used to connect with the connecting pipe of the medium and low-pressure cylinder, and the condensate outlet pipe of the high-pressure generator is used to connect with the condensate cooler.

[0011] Furthermore, the first valve and the second valve have the same closed state, the third valve and the fourth valve have the same closed state, and the fifth valve and the sixth valve have the same closed state.

[0012] Furthermore, the first valve and the fifth valve have the same closing state, and the first valve and the third valve have opposite closing states.

[0013] Furthermore, the operation method of the above-mentioned medium-deep geothermal system combining power plant condensate heating includes the following steps: During the non-heating season, geothermal raw water flows out from the intake well, is cooled by a first titanium plate heat exchanger, and then enters the reinjection well through a second titanium plate heat exchanger. The heat from the first titanium plate heat exchanger is exchanged through a condensate cooler to heat the power plant condensate. During the heating season, geothermal raw water flows out from the intake well, is cooled by the first and second titanium plate heat exchangers, and then enters the reinjection well. The first titanium plate heat exchanger releases heat to the heating network return water. A steam-type lithium bromide heat pump unit uses driving steam as power to extract heat from the second titanium plate heat exchanger and releases the heat to the heating network return water. The steam condensate generated by the steam-type lithium bromide heat pump unit is exchanged through a condensate cooler to heat the power plant condensate.

[0014] Compared with the prior art, the present invention has the following beneficial technical effects: The present invention provides a medium-deep geothermal system combining power plant condensate heating. A first titanium plate heat exchanger and a second titanium plate heat exchanger are connected in series. The geothermal raw water flows from the intake well and undergoes two stages of heat exchange and cooling to ensure that the geothermal heat is fully released before entering the reinjection well, thus improving the utilization rate of geothermal resources. The return water pipe of the heating network is connected to the first titanium plate heat exchanger and a steam-type lithium bromide heat pump unit, respectively, and both are connected to the heating pipe, thus providing dual-path heating for the return water. The first titanium plate heat exchanger directly utilizes geothermal heat to heat the return water, while the steam-type lithium bromide heat pump unit forms a circulation loop with the second titanium plate heat exchanger to extract the heat released by the geothermal raw water and further heat the return water. Water is used to meet heating demand and reduce heating energy consumption. The steam-type lithium bromide heat pump unit is connected to the medium and low pressure cylinder through the steam inlet pipe, using the waste heat of the power plant as driving power to reduce additional energy consumption. The third outlet pipe of the steam-type lithium bromide heat pump unit is connected to the condensate cooler, and the first titanium plate heat exchanger is connected to the condensate cooler. In the non-heating season, the geothermal energy extracted by the first titanium plate heat exchanger is fully recovered. In the heating season, the waste heat of the condensate generated by the heat pump unit is fully utilized to heat the condensate of the power plant, realizing the cascade recovery and reuse of energy. This not only ensures the stable reinjection of geothermal raw water and the efficient heating of the heating network return water, but also makes full use of geothermal energy throughout the year, reducing the overall operating energy consumption of the system and improving energy utilization efficiency and equipment utilization rate.

[0015] During the heating season, when the first and second valves are open and the third and fourth valves are closed, the second outlet pipe of the first titanium plate heat exchanger completely enters the heating pipe to prioritize the heating demand of the heating network. During the non-heating season, when the first and second valves are closed and the third and fourth valves are open, the second outlet pipe of the first titanium plate heat exchanger completely enters the condensate cooler to exchange heat with the power plant condensate, prioritizing the heating demand of the power plant condensate. Attached Figure Description

[0016] Figure 1 is a schematic diagram of the structure of a medium-deep geothermal system that combines power plant condensate heating according to the present invention.

[0017] Figure reference numerals: 1-Intake well; 2-First titanium plate heat exchanger; 3-Second titanium plate heat exchanger; 4-Steam type lithium bromide heat pump unit; 5-Recharge well; 6-Drain cooler; 7-First valve; 8-Second valve; 9-Third valve; 10-Fourth valve; 11-Fifth valve; 12-Condenser; 13-Sixth valve. Detailed Implementation

[0018] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0019] Example 1: This invention discloses a medium-deep geothermal system combining power plant condensate heating, comprising an intake well 1, a first titanium plate heat exchanger 2, a second titanium plate heat exchanger 3, a steam-type lithium bromide heat pump unit 4, and a reinjection well 5. The first inlet pipe of the first titanium plate heat exchanger 2 is connected to the intake well 1, and the first outlet pipe is connected to the first inlet pipe of the second titanium plate heat exchanger 3. The first outlet pipe of the second titanium plate heat exchanger 3 is connected to the reinjection well 5, and the second outlet pipe of the second titanium plate heat exchanger 3 is connected to the first inlet pipe of the steam-type lithium bromide heat pump unit 4. The first outlet pipe of group 4 is connected to the second inlet pipe of the second titanium plate heat exchanger 3. The second inlet pipe of the steam-type lithium bromide heat pump unit 4 is connected to the return water pipe of the heating network. The second outlet pipe of the steam-type lithium bromide heat pump unit 4 is connected to the heating pipe. The second inlet pipe of the first titanium plate heat exchanger 2 is connected to the return water pipe of the heating network. The second outlet pipe of the first titanium plate heat exchanger 2 is connected to the heating pipe. The steam inlet pipe of the steam-type lithium bromide heat pump unit 4 is used to connect to the medium and low pressure cylinder connecting pipe. The third outlet pipe is connected to the condensate cooler 6. The first titanium plate heat exchanger 2 is connected to the condensate cooler 6.

[0020] Specifically, the geothermal raw water extracted from the intake well 1 is processed by a hydrocyclone desander and then fed into the first titanium plate heat exchanger 2 through the first inlet pipe for the first heat exchange. After the heat exchange, the geothermal raw water enters the second titanium plate heat exchanger 3, undergoes a second heat exchange, and then enters the reinjection well 5 through the first outlet pipe of the second titanium plate heat exchanger 3. As shown in Figure 1, the left side of the first titanium plate heat exchanger 2 and the second titanium plate heat exchanger 3 contains geothermal water, and the right side of the first titanium plate heat exchanger 3 contains the heat network return water.

[0021] The second outlet pipe of the second titanium plate heat exchanger 3 is connected to the first inlet pipe of the steam-type lithium bromide heat pump unit 4, and the first outlet pipe of the steam-type lithium bromide heat pump unit 4 is connected to the second inlet pipe of the second titanium plate heat exchanger 3, forming a closed-loop heat exchange circuit to ensure the stability and continuity of heat transfer between geothermal raw water and heat pump unit, and improve the efficiency of cascade heat exchange.

[0022] The return water from the heating network flows in through the return water pipe and is divided into two paths: one path flows to the first titanium plate heat exchanger 2, and the other path flows to the steam-type lithium bromide heat pump unit 4.

[0023] In summary, the first titanium plate heat exchanger 2 and the second titanium plate heat exchanger 3 are connected in series. After the geothermal raw water flows out of the intake well 1, it undergoes two stages of heat exchange and cooling to ensure that the geothermal heat is fully released before entering the reinjection well 5, thus improving the utilization rate of geothermal resources. The return water pipe of the heating network is connected to the first titanium plate heat exchanger 2 and the steam-type lithium bromide heat pump unit 4, respectively, and both are connected to the heating pipe, thus providing dual-path heating for the return water. The first titanium plate heat exchanger 2 directly utilizes geothermal heat to heat the return water, while the steam-type lithium bromide heat pump unit 4, through a circulation loop with the second titanium plate heat exchanger 3, extracts the heat released by the geothermal raw water to further heat the return water, thereby meeting heating demand and reducing heating energy consumption. The steam-type lithium bromide heat pump unit 4 is connected to the medium and low pressure cylinder through a steam inlet pipe, using the waste heat of the power plant as driving power to reduce additional energy consumption. The third outlet pipe of the steam-type lithium bromide heat pump unit 4 is connected to the condensate cooler 6, and the first titanium plate heat exchanger 2 is connected to the condensate cooler 6, which fully recovers the waste heat of the first titanium plate heat exchanger 2 and the waste heat of the condensate generated by the heat pump unit. In the non-heating season, it is used to heat the condensate of the power plant, realizing the cascade recovery and reuse of energy. It not only ensures the stable reinjection of geothermal raw water and the efficient heating of the heat network return water, but also fully recovers geothermal energy throughout the year, reducing the overall operating energy consumption of the system and improving energy utilization efficiency and equipment utilization rate.

[0024] The return water from the heating network flows through the first titanium plate heat exchanger 2 to the heating pipe. A first valve 7 is installed between the return water pipe and the second inlet pipe of the first titanium plate heat exchanger 2, and a second valve 8 is installed between the return water pipe and the second outlet pipe of the first titanium plate heat exchanger 2. By adjusting the first valve 7 and the second valve 8, the flow rate of the return water through the first titanium plate heat exchanger 2 is controlled, thereby regulating the heat exchange intensity between the geothermal raw water and the return water, and preventing a decrease in heat exchange efficiency due to excessive or insufficient flow.

[0025] The second outlet pipe of the first titanium plate heat exchanger 2 is connected to the condensate cooler 6. The first titanium plate heat exchanger 2 exchanges heat with the condensate cooler 6 to heat the power plant condensate. A third valve 9 is installed between the second outlet pipe of the first titanium plate heat exchanger 2 and the first inlet pipe of the condensate cooler 6, and a fourth valve 10 is installed between the first outlet pipe of the condensate cooler 6 and the second inlet pipe of the first titanium plate heat exchanger 2. When geothermal energy needs to be used to heat the power plant condensate during the non-heating season, the third valve 9 and the fourth valve 10 are opened, allowing some or all of the water from the geothermal outlet pipe of the first titanium plate heat exchanger to enter the condensate cooler 6 for heat exchange with the power plant condensate, increasing the condensate temperature, reducing the extraction of steam from the subsequent low-pressure heaters, and enabling year-round utilization of geothermal energy. During the heating season, the third valve 9 and the fourth valve 10 are closed, allowing the return water from the heating network to directly enter the first titanium plate heat exchanger for heating before entering the heating pipes.

[0026] It should be noted that the first valve 7 and the second valve 8 are in the same closed state, and the third valve 9 and the fourth valve 10 are in the same closed state, while the first valve 7 and the third valve 9 are in opposite closed states. During the heating season, when the first valve 7 and the second valve 8 are open and the third valve 9 and the fourth valve 10 are closed, the second outlet pipe of the first titanium plate heat exchanger 2 entirely enters the heating pipe, prioritizing the heating needs of the heating network. During the non-heating season, when the first valve 7 and the second valve 8 are closed and the third valve 9 and the fourth valve 10 are open, the second outlet pipe of the first titanium plate heat exchanger 2 entirely enters the condensate cooler 6 to exchange heat with the power plant condensate, prioritizing the heating needs of the power plant condensate.

[0027] Another route for the return water from the heating network passes through a steam-type lithium bromide heat pump unit 4. This unit uses driving steam to extract heat from the second titanium plate heat exchanger 3 and releases it to the return water, which then flows to the heating pipes. A fifth valve 11 is installed between the third outlet pipe of the steam-type lithium bromide heat pump unit 4 and the first inlet pipe of the condensate cooler 6. The first outlet pipe of the condensate cooler 6 is connected to the condenser 12 via a sixth valve 13. When both the fifth valve 11 and the sixth valve 13 are open, the condensate generated by the steam-type lithium bromide heat pump unit 4 preferentially enters the condensate cooler 6 to exchange heat with the power plant condensate, utilizing the waste heat of the condensate to preheat the power plant condensate.

[0028] The fifth valve 11 and the sixth valve 13 are in the same closed state. The fifth valve 11 and the first valve 7 are in the same closed state, and the fifth valve 11 is in the opposite closed state to the third valve 9.

[0029] In other words, after the return water from the heating network flows into the system through the return water pipe, it splits into two parallel flows. One flow goes to the first titanium plate heat exchanger 2, where it directly exchanges heat with the geothermal raw water flowing from the intake well 1, absorbing the heat from the geothermal raw water to raise its temperature. The other flow goes to the steam-type lithium bromide heat pump unit 4, which uses driving steam to extract the heat released by the geothermal raw water in the second titanium plate heat exchanger 3, and then transfers the heat to the flowing return water, raising its temperature. The two flow paths of return water then merge and flow into the heating pipe.

[0030] The steam-type lithium bromide heat pump unit 4 includes a high-pressure generator, a condenser, an evaporator, and an absorber. The second inlet pipe of the second titanium plate heat exchanger 3 is connected to the evaporator inlet, and the evaporator outlet is connected to the second outlet pipe of the second titanium plate heat exchanger 3. The heat network return water pipe is connected to the absorber inlet, and the condenser outlet is connected to the heating pipe. The steam inlet pipe of the high-pressure generator is used to connect to the medium and low-pressure cylinder connecting pipe, and the condensate outlet pipe of the high-pressure generator is used to connect to the condensate cooler 6. Specifically, the second inlet pipe of the second titanium plate heat exchanger 3 is sealed to the evaporator inlet, and the evaporator outlet is connected to the second outlet pipe of the second titanium plate heat exchanger 3, forming a closed heat exchange loop between the evaporator and the second titanium plate heat exchanger 3 for pre-heat exchange and recovery of low-temperature waste heat. The heat network return water pipe is fixedly connected to the absorber inlet to introduce low-temperature heat network return water into the absorber for heating. The condenser outlet is sealed to the heating pipe, and the heated high-temperature hot water is transferred to the heating pipe. The steam inlet pipe of the high-pressure generator is used to connect with the connecting pipe of the medium and low-pressure cylinder, so that the steam discharged from the medium and low-pressure cylinder can be used as a driving heat source to provide energy for the steam-type lithium bromide heat pump unit 4; the condensate outlet pipe of the high-pressure generator is connected to the condensate cooler 6, so that the condensate generated after the steam in the high-pressure generator is condensed can be transported to the condensate cooler 6 for cooling and recycling.

[0031] Example 2: An operation method of a medium-deep geothermal system combining power plant condensate heating, comprising the following steps: During the non-heating season, geothermal raw water flows out from the intake well 1, is cooled by the first titanium plate heat exchanger 2, and enters the reinjection well 5 through the second titanium plate heat exchanger 3. The heat from the first titanium plate heat exchanger 2 is exchanged through a condensate cooler 6 to heat the power plant condensate. During the heating season, geothermal raw water flows out from the intake well 1, is cooled by the first titanium plate heat exchanger 2 and the second titanium plate heat exchanger 3, and enters the reinjection well 5. The first titanium plate heat exchanger 2 releases heat to the heating network return water. A steam-type lithium bromide heat pump unit 4 uses driving steam as power to extract heat from the second titanium plate heat exchanger 3 and releases the heat to the heating network return water. The steam condensate generated by the steam-type lithium bromide heat pump unit 4 is exchanged through the condensate cooler 6 to heat the power plant condensate.

[0032] Specifically, during the non-heating season, valves 7, 8, 11, and 13 are closed simultaneously, while valves 9 and 10 are opened simultaneously. Geothermal raw water flows from intake well 1, passes through the first titanium plate heat exchanger 2 and the second titanium plate heat exchanger 3 for cooling, and then enters reinjection well 5. The first titanium plate heat exchanger 2 absorbs heat from the geothermal raw water and transfers it through valve 9 to the drain cooler 6, where it exchanges heat with the power plant condensate to recover waste geothermal heat and heat the power plant condensate. After heat exchange, the water flows back to the first titanium plate heat exchanger 2 through valve 10.

[0033] During the heating season, valves 7, 8, 11, and 13 open simultaneously, while valves 9 and 10 close simultaneously. Geothermal raw water flows from intake well 1, is cooled by the first titanium plate heat exchanger 2 and the second titanium plate heat exchanger 3, and then enters reinjection well 5. Simultaneously, the heating network return water flows from the return water pipe and splits into two parallel streams: one stream flows to the first titanium plate heat exchanger 2, directly exchanging heat with the geothermal raw water; the other stream flows to the steam-type lithium bromide heat pump unit 4, which uses driving steam to extract heat released from the geothermal raw water in the second titanium plate heat exchanger 3. The two streams of heated heating network return water merge and flow into the heating pipe. The condensate from the steam-type lithium bromide heat pump unit 4 enters the condensate cooler 6 through valve 11, exchanging heat with the power plant condensate. The condensate after heat exchange flows into the condenser 12 through valve 13.

[0034] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

Claims

1. A medium-deep geothermal system combining power plant condensate heating, characterized in that: The system includes a water intake well (1), a first titanium plate heat exchanger (2), a second titanium plate heat exchanger (3), a steam-type lithium bromide heat pump unit (4), and a reinjection well (5). The first inlet pipe of the first titanium plate heat exchanger (2) is connected to the water intake well (1), and the first outlet pipe is connected to the first inlet pipe of the second titanium plate heat exchanger (3). The first outlet pipe of the second titanium plate heat exchanger (3) is connected to the reinjection well (5), and the second outlet pipe of the second titanium plate heat exchanger (3) is connected to the first inlet pipe of the steam-type lithium bromide heat pump unit (4). The first outlet pipe of the steam-type lithium bromide heat pump unit (4) is connected to the second... The second inlet pipe of the titanium plate heat exchanger (3) is connected to the second inlet pipe of the steam-type lithium bromide heat pump unit (4) and the return water pipe of the heating network. The second outlet pipe of the steam-type lithium bromide heat pump unit (4) is connected to the heating pipe. The second inlet pipe of the first titanium plate heat exchanger (2) is connected to the return water pipe of the heating network. The second outlet pipe of the first titanium plate heat exchanger (2) is connected to the heating pipe. The steam inlet pipe of the steam-type lithium bromide heat pump unit (4) is used to connect to the medium and low pressure cylinder connecting pipe. The third outlet pipe is connected to the condensate cooler (6). The first titanium plate heat exchanger (2) is connected to the condensate cooler (6).

2. The medium-deep geothermal system combining power plant condensate heating according to claim 1, characterized in that: A first valve (7) is provided between the second inlet pipe of the first titanium plate heat exchanger (2) and the return water pipe of the heating network, and a second valve (8) is provided between the second outlet pipe of the first titanium plate heat exchanger (2) and the heating pipe.

3. The medium-deep geothermal system combining power plant condensate heating according to claim 2, characterized in that: A third valve (9) is provided between the second outlet pipe of the first titanium plate heat exchanger (2) and the first inlet pipe of the condensate cooler (6), and a fourth valve (10) is provided between the first outlet pipe of the condensate cooler (6) and the second inlet pipe of the first titanium plate heat exchanger (2).

4. The medium-deep geothermal system combining power plant condensate heating according to claim 3, characterized in that: It also includes a condenser (12), and a fifth valve (11) is provided between the third outlet pipe of the steam-type lithium bromide heat pump unit (4) and the first inlet pipe of the condenser (6). The first outlet pipe of the condenser (6) is connected to the condenser (12) through a sixth valve (13).

5. The medium-deep geothermal system combining power plant condensate heating according to claim 1, characterized in that: The steam-type lithium bromide heat pump unit (4) includes a high-pressure generator, a condenser, an evaporator, and an absorber.

6. The medium-deep geothermal system combining power plant condensate heating according to claim 5, characterized in that: The second inlet pipe of the second titanium plate heat exchanger (3) is connected to the inlet of the evaporator, the outlet of the evaporator is connected to the second outlet pipe of the second titanium plate heat exchanger (3), the heat network return water pipe is connected to the inlet of the absorber, and the outlet of the condenser is connected to the heating pipe.

7. The medium-deep geothermal system combining power plant condensate heating according to claim 6, characterized in that: The steam inlet pipe of the high-pressure generator is used to connect with the medium and low pressure cylinder connecting pipe, and the condensate outlet pipe of the high-pressure generator is used to connect with the condensate cooler (6).

8. The medium-deep geothermal system combining power plant condensate heating according to claim 4, characterized in that: The first valve (7) and the second valve (8) are in the same closed state, the third valve (9) and the fourth valve (10) are in the same closed state, and the fifth valve (11) and the sixth valve (13) are in the same closed state.

9. The medium-deep geothermal system combining power plant condensate heating according to claim 8, characterized in that: The first valve (7) and the fifth valve (11) are in the same closed state, and the first valve (7) and the third valve (9) are in opposite closed states.

10. An operation method for a medium-deep geothermal system combining power plant condensate heating as described in any one of claims 1-9, characterized in that, Includes the following steps: During the non-heating season, geothermal raw water flows out from the intake well (1), is cooled by the first titanium plate heat exchanger (2), and enters the reinjection well (5) through the second titanium plate heat exchanger (3). The heat from the first titanium plate heat exchanger (2) is exchanged through the condensate cooler (6) to heat the condensate of the power plant. During the heating season, geothermal raw water flows out from the intake well (1), is cooled by the first titanium plate heat exchanger (2) and the second titanium plate heat exchanger (3), and enters the reinjection well (5). The first titanium plate heat exchanger (2) releases heat to the heat network return water. The steam-type lithium bromide heat pump unit (4) uses driving steam as power to extract heat from the second titanium plate heat exchanger (3) and releases the heat to the heat network return water. The steam condensate generated by the steam-type lithium bromide heat pump unit (4) is exchanged through the condensate cooler (6) to heat the condensate of the power plant.

Images