ORC geothermal power generation comprehensive gradient utilization system

Abstract

The utility model discloses an ORC (organic Rankine cycle) geothermal power generation comprehensive gradient utilization system, which relates to the technical field of ORC geothermal power generation and comprises a geothermal production well, a recharge well, a complete ORC generator set, a first-stage plate heat exchanger, a second-stage plate heat exchanger, a recharge water treatment device, a softened water tank, a water softener, a make-up pump, a cooling tower, a heat pump unit, a heat user side, a cooling circulating pump and a submersible pump. The complete ORC generator set comprises an evaporator, a preheater, a condenser, a generator and a working medium pump, a submersible pump is arranged in the production well, and the submersible pump is connected with the evaporator through a pipeline. According to the ORC geothermal power generation comprehensive gradient utilization system, a two-stage plate heat exchanger, a heat pump unit, a circulating water pump and other equipment are additionally arranged on the basis of traditional ORC geothermal power generation, the temperature utilization rate of geothermal water for geothermal power generation is increased, geothermal energy is converted into heat energy for heating to the maximum extent, and the heat supply capacity is improved.

Description

Technical Field

[0001] This utility model relates to the field of ORC geothermal power generation technology, and in particular to an ORC geothermal power generation integrated cascade utilization system. Background Technology

[0002] ORC is a cycle that uses low-boiling-point organic matter as the working fluid. Its working principle is similar to that of traditional steam turbine power generation, but it uses organic working fluid instead of water. In the ORC system, the low-boiling-point organic matter absorbs heat from the geothermal fluid in the evaporator and evaporates. The generated steam enters the expander (such as a turbine) to expand and do work, driving the generator to generate electricity. The steam after doing work is cooled and condensed into liquid in the condenser, and then pumped back into the evaporator to form a cycle.

[0003] In ORC geothermal power generation systems, geothermal water with a temperature above 100°C is extracted from the production well and enters the evaporator and preheater of the ORC generator unit. Even after use, the geothermal water still retains a temperature above 50°C and has significant utilization value. Direct reinjection of this water would result in a waste of geothermal resources. Therefore, those skilled in the art have provided an ORC geothermal power generation integrated cascade utilization system to address the problems mentioned in the background section. Utility Model Content

[0004] To address the shortcomings of existing technologies, this invention provides an ORC geothermal power generation integrated cascade utilization system, which solves the problems mentioned in the background.

[0005] To achieve the above objectives, this utility model is implemented through the following technical solution: an ORC geothermal power generation integrated cascade utilization system, comprising a production well, an evaporator, a preheater, a condenser, a generator, a working fluid pump, a primary plate heat exchanger, a secondary plate heat exchanger, a reinjection water treatment device, a softened water tank, a water softener, a makeup water pump, a cooling tower, a heat pump unit, a heat user terminal, a cooling circulation pump, a submersible pump, and a reinjection well, wherein the evaporator, preheater, condenser, generator, and working fluid pump constitute a complete ORC generator set;

[0006] The evaporator, preheater, condenser, generator, and working fluid pump are described. A submersible pump is installed inside the production well. The submersible pump is connected to the evaporator through a pipeline. The evaporator is connected to the preheater through a pipeline. The condenser is connected to the cooling tower through a pipeline. The preheater is connected to the first-stage plate heat exchanger through a pipeline. The first-stage plate heat exchanger is connected to the second-stage plate heat exchanger through a pipeline.

[0007] The secondary plate heat exchanger is connected to the heat pump unit via pipes, and the heat pump unit is also connected to the heat user end, the softened water tank, and the water softener via pipes.

[0008] As a further technical solution of this utility model, the geothermal water temperature in the production well that flows to the evaporator through the pipeline is 120°C, and the geothermal water temperature in the preheater that flows to the first-stage plate heat exchanger through the pipeline is 80°C.

[0009] As a further technical solution of this utility model, the primary plate heat exchanger and the heat pump unit work together to generate 45°C hot water which flows to the heat user end.

[0010] As a further technical solution of this utility model, the geothermal water temperature flowing from the primary plate heat exchanger to the secondary plate heat exchanger through the pipeline is 40°C, and the geothermal water temperature flowing from the secondary plate heat exchanger to the reinjection water treatment device through the pipeline is 15°C.

[0011] As a further technical solution of this utility model, the intermediate water temperature of the secondary plate heat exchanger flowing to the heat pump unit through the pipeline is 23°C, and the intermediate water temperature of the heat pump unit flowing to the secondary plate heat exchanger through the pipeline is 13°C.

[0012] As a further technical solution of this utility model, a heating circulation pump is also provided on the connecting pipe between the heat user terminal and the heat pump unit, the softened water tank is connected to the connecting pipe between the heat user terminal and the heat pump unit, and a water replenishment pump is installed on the connecting pipe of the softened water tank.

[0013] As a further technical solution of this utility model, a cooling circulation pump is provided on the connecting pipe between the condenser and the cooling tower, a working fluid pump is provided on the connecting pipe between the preheater and the condenser, and a heat pump circulation pump is provided on the connecting pipe between the heat pump unit and the secondary plate heat exchanger.

[0014] This utility model provides an ORC geothermal power generation integrated cascade utilization system, which has the following advantages compared with the prior art:

[0015] This design proposes an ORC geothermal power generation integrated cascade utilization system. Based on traditional ORC geothermal power generation, it adds two stages of plate heat exchangers, heat pump units, circulating water pumps, and other equipment to increase the temperature utilization rate of geothermal water generated by geothermal power generation, maximize the conversion of geothermal energy into heating energy, and increase heating capacity. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of an ORC geothermal power generation integrated cascade utilization system.

[0017] In the diagram: 1. Production well; 2. Evaporator; 3. Generator; 4. Preheater; 5. Cooling tower; 6. Heat user end; 7. Heating circulation pump; 8. Make-up water pump; 9. Softened water tank; 10. Water softener; 11. Recharge water treatment device; 12. Primary plate heat exchanger; 13. Secondary plate heat exchanger; 14. Working fluid pump; 15. Condenser; 16. Heat pump unit; 17. Heat pump circulation pump; 18. Cooling circulation pump; 19. Submersible pump; 20. Recharge well. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0019] Please see Figure 1 This utility model provides a technical solution for an ORC geothermal power generation integrated cascade utilization system, including a production well 1, an evaporator 2, a preheater 4, a condenser 15, a generator 3, a working fluid pump 14, a primary plate heat exchanger 12, a secondary plate heat exchanger 13, a reinjection water treatment device 11, a softened water tank 9, a water softener 10, a makeup water pump 8, a cooling tower 5, a heat pump unit 16, a heat user terminal 6, a cooling circulation pump 18, a submersible pump 19, and a reinjection well 20;

[0020] Evaporator 2, preheater 4, condenser 15, generator 3, and working fluid pump 14 are combined to form a complete ORC generator set. A submersible pump 19 is installed inside the production well 1. The submersible pump 19 is connected to the evaporator 2 through a pipeline. The evaporator 2 is connected to the preheater 4 through a pipeline. The condenser 15 is connected to the cooling tower 5 through a pipeline. The preheater 4 is connected to the first-stage plate heat exchanger 12 through a pipeline. The first-stage plate heat exchanger 12 is connected to the second-stage plate heat exchanger 13 through a pipeline. The second-stage plate heat exchanger 13 is connected to the heat pump unit 16 through a pipeline. The heat pump unit 16 is also connected to the heat user terminal 6, the softened water tank 9, and the water softener 10 through pipelines.

[0021] In practical applications, the geothermal water flowing from production well 1 to evaporator 2 via pipeline has a temperature of 120°C, while the geothermal water flowing from preheater 4 to primary plate heat exchanger 12 has a temperature of 80°C. The primary plate heat exchanger 12 and heat pump unit 16 work together to generate hot water at 45°C, which is then transported to heat user 6 via pipeline for convenient use by heat user 6.

[0022] The geothermal water temperature in the pipes flowing from the primary plate heat exchanger 12 to the secondary plate heat exchanger 13 is 40°C, while the geothermal water temperature flowing from the secondary plate heat exchanger 13 to the reinjection water treatment device 11 through the pipes is 15°C. Furthermore, the intermediate water temperature flowing from the secondary plate heat exchanger 13 to the heat pump unit 16 through the pipes is 23°C, and the intermediate water temperature flowing from the heat pump unit 16 to the secondary plate heat exchanger 13 through the pipes is 13°C.

[0023] A heating circulation pump 7 is also installed on the connecting pipe between the heat user terminal 6 and the heat pump unit 16. The softened water tank 9 is connected to the connecting pipe between the heat user terminal 6 and the heat pump unit 16, and a makeup water pump 8 is installed on the connecting pipe of the softened water tank 9. A cooling circulation pump 18 is installed on the connecting pipe between the condenser 15 and the cooling tower 5. A working fluid pump 14 is installed on the connecting pipe between the preheater 4 and the condenser 15. A heat pump circulation pump 17 is installed on the connecting pipe between the heat pump unit 16 and the secondary plate heat exchanger 13.

[0024] The working principle of this utility model is as follows: In actual use, the ORC geothermal power generation integrated cascade utilization system designed in this utility model extracts 120°C geothermal water from the production well 1 through the submersible pump 19. The extracted 120°C geothermal water first enters the complete set of ORC generator sets and serves as the heat source for generator 3 to generate electricity. Then, after heat exchange through evaporator 2 and preheater 4, the temperature drops to 80°C.

[0025] Then it enters the first-stage plate heat exchanger 12. After heat exchange in the first-stage plate heat exchanger 12, the temperature drops to 40℃. The 40℃ geothermal water then enters the second-stage plate heat exchanger 13. After heat exchange in the second-stage plate heat exchanger 13, the temperature drops to 15℃. Finally, it passes through the reinjection water treatment device 11 and is reinjected into the reinjection well 20.

[0026] The condenser 15 of generator 3 is connected to cooling tower 5 and heat user terminal 6. The two can be switched by valve according to the heat load demand. The secondary side of the first-stage plate heat exchanger 12 is connected to the terminal heat user terminal 6 for heating. The second-stage plate heat exchanger 13 is connected to heat pump unit 16 with a heat exchange temperature of 13 / 23℃. Heat pump unit 16 produces hot water at 35 / 45℃ for heating, which increases the temperature utilization rate of geothermal hot water generated by geothermal power generation, maximizes the conversion of geothermal energy into heat energy for heating, and increases the heating capacity.

[0027] The above description is merely a preferred embodiment of this utility model. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model. Structures, devices, and operating methods not specifically described or explained in this utility model are implemented according to conventional methods in the art, unless otherwise specified or limited.

Claims

1. An ORC geothermal power generation comprehensive cascade utilization system, characterized in that, It includes a production well (1), an evaporator (2), a preheater (4), a condenser (15), a generator (3), a working fluid pump (14), a primary plate heat exchanger (12), a secondary plate heat exchanger (13), a reinjection water treatment device (11), a softened water tank (9), a water softener (10), a makeup water pump (8), a cooling tower (5), a heat pump unit (16), a heat user terminal (6), a cooling circulation pump (18), a submersible pump (19), and a reinjection well (20); The production well (1) is equipped with a submersible pump (19). The submersible pump (19) is connected to the evaporator (2) through a pipe. The evaporator (2) is connected to the preheater (4) through a pipe. The condenser (15) is connected to the cooling tower (5) through a pipe. The preheater (4) is connected to the first-stage plate heat exchanger (12) through a pipe. The first-stage plate heat exchanger (12) is connected to the second-stage plate heat exchanger (13) through a pipe. The secondary plate heat exchanger (13) is connected to the heat pump unit (16) via a pipe. The heat pump unit (16) is also connected to the heat user terminal (6), the softened water tank (9), and the water softener (10) via a pipe.

2. The ORC geothermal power generation integrated cascade utilization system according to claim 1, characterized in that, The geothermal water temperature in the production well (1) flowing through the pipeline to the evaporator (2) is 120°C, and the geothermal water temperature in the preheater (4) flowing through the pipeline to the first-stage plate heat exchanger (12) is 80°C.

3. The ORC geothermal power generation comprehensive cascade utilization system according to claim 1, characterized in that, The primary plate heat exchanger (12) and the heat pump unit (16) work together to generate hot water at 45°C, which flows to the heat user end (6).

4. The ORC geothermal power generation comprehensive cascade utilization system according to claim 1, characterized in that, The geothermal water temperature flowing from the primary plate heat exchanger (12) to the secondary plate heat exchanger (13) through the pipeline is 40°C, and the geothermal water temperature flowing from the secondary plate heat exchanger (13) to the reinjection water treatment device (11) through the pipeline is 15°C.

5. The ORC geothermal power generation comprehensive cascade utilization system according to claim 1, characterized in that, The intermediate water temperature of the secondary plate heat exchanger (13) flowing to the heat pump unit (16) through the pipeline is 23°C, and the intermediate water temperature of the heat pump unit (16) flowing to the secondary plate heat exchanger (13) through the pipeline is 13°C.

6. The ORC geothermal power generation comprehensive cascade utilization system according to claim 1, characterized in that, A heating circulation pump (7) is also installed on the connecting pipe between the heat user terminal (6) and the heat pump unit (16). The softened water tank (9) is connected to the connecting pipe between the heat user terminal (6) and the heat pump unit (16), and a water replenishment pump (8) is installed on the connecting pipe of the softened water tank (9).

7. The ORC geothermal power generation comprehensive cascade utilization system according to claim 1, characterized in that, A cooling circulation pump (18) is installed on the connecting pipe between the condenser (15) and the cooling tower (5), a working fluid pump (14) is installed on the connecting pipe between the preheater (4) and the condenser (15), and a heat pump circulation pump (17) is installed on the connecting pipe between the heat pump unit (16) and the secondary plate heat exchanger (13).

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