Dry-wet combined condensation system for ORC (organic Rankine cycle)

Abstract

The utility model discloses a dry-wet combined condensation system for an ORC (organic Rankine cycle). The dry-wet combined condensation system comprises an air condenser, an evaporative condenser, a make-up pump, a water storage tank and a working medium liquid storage tank, a turbine generator and a working medium pump of the ORC system are connected with the air condenser and the working medium liquid storage tank respectively, the air condenser is connected with the evaporative condenser and the working medium liquid storage tank, the evaporative condenser is connected with the working medium liquid storage tank, the water storage tank is connected with the make-up pump, and the make-up pump is connected with the water storage tank. And the make-up pump is connected with the evaporative condenser. The device has the advantages that water can be saved to the greatest extent, the problem of land occupation of the ORC system is solved, the performance of the condenser can be ensured while the water limitation is met, the power generation performance of the ORC system and the stable operation of the whole process system are further ensured, and the economical efficiency can reach the expected effect.

Description

Technical Field

[0001] This utility model relates to the field of cryogenic power generation technology, and in particular to a dry-wet combined condensation system for ORC. Background Technology

[0002] The condensing system, as a key component of a cryogenic Organic Rankine Cycle (ORC) generator set, typically comprises three types of condensing equipment: 1) water-cooled condensers, 2) evaporative condensers, and 3) air condensers. Their primary function is to cool and condense the exhaust gas containing the organic working fluid after the turbine has performed its work. The condensed liquid organic working fluid is then pumped to the evaporator to exchange heat with the waste heat source and vaporize. The vaporized organic working fluid drives the turbine to perform work and output electrical energy. The exhaust gas containing the organic working fluid after performing work is then cooled and condensed again in the condenser, completing the thermodynamic cycle of the entire system. Changes in outdoor ambient temperature affect the performance of the condenser, and these changes are reflected in the condensing pressure. The condensing pressure directly impacts the performance of the ORC system.

[0003] In areas where annual water consumption is limited, air condensers are often used. However, due to limitations in floor space and outdoor ambient temperature, especially during the hot summer months, the performance of air condensers deteriorates significantly, leading to a substantial decrease in the performance of the ORC system, a significant reduction in economic efficiency, and even the inability to meet the heat source process outlet water temperature requirements, thereby affecting the safe operation of the entire large process system. Utility Model Content

[0004] The purpose of this invention is to provide a combined wet and dry condensation system for ORC, thereby solving the aforementioned problems existing in the prior art.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A combined wet and dry condensing system for ORC includes an air condenser, an evaporative condenser, a makeup water pump, a water storage tank, and a working fluid storage tank. The ORC system's turbine generator and working fluid pump are respectively connected to the air condenser and the working fluid storage tank. The air condenser is connected to the evaporative condenser and the working fluid storage tank. The evaporative condenser is connected to the working fluid storage tank. The water storage tank is connected to the makeup water pump, and the makeup water pump is connected to the evaporative condenser.

[0007] Preferably, a bypass automatic valve is provided on the connecting pipe between the air condenser and the evaporative condenser.

[0008] Preferably, an automatic condenser outlet valve is provided on the connecting pipeline between the air condenser and the working fluid storage tank.

[0009] Preferably, a water supply regulating valve is provided on the connecting pipeline between the water supply pump and the evaporative condenser.

[0010] Preferably, the working fluid storage tank is equipped with a condensation pressure transmitter.

[0011] Preferably, the water storage tank is equipped with a water level gauge.

[0012] Preferably, a fan is installed at the top of the evaporative condenser, and a spray water pump is connected to the lower end of the evaporative condenser. A spray head and a working fluid heat exchange pipe are installed inside the evaporative condenser. The working fluid heat exchange pipe is located below the spray head, and the spray head is connected to the spray water pump. The air condenser is connected to the working fluid heat exchange pipe installed inside the evaporative condenser, and the working fluid heat exchange pipe is connected to the working fluid storage tank. The spray water pump sprays water from the lower part of the evaporative condenser onto the working fluid heat exchange pipe through the spray head to achieve heat exchange.

[0013] Preferably, the evaporative condenser is equipped with a condenser level gauge.

[0014] The beneficial effects of this utility model are as follows: 1. The dry-wet combined condensing system provided by this utility model can ensure the performance of the ORC system even during the high-temperature period in summer, under the conditions of annual water consumption restrictions and limited land area, ensuring economy while maximizing water conservation. 2. Both the dry condensing mode and the dry-wet combined condensing mode of the dry-wet combined condensing system provided by this utility model are automatically completed by the control system, which has higher reliability. 3. The dry-wet combined condensing system provided by this utility model can collect excess water on site at any time by setting up a water storage tank. The water storage capacity in the water storage tank can extend the operating time of the wet mode, which has higher economic efficiency. Attached Figure Description

[0015] Figure 1 This is a structural diagram of the dry-wet combined condensation system in an embodiment of this utility model.

[0016] In the diagram: 1-Air condenser; 2-Bypass automatic valve; 3-Evaporative condenser; 4-Fan; 5-Condenser level gauge; 6-Spray water pump; 7-Make-up water regulating valve; 8-Make-up water pump; 9-Water storage tank; 10-Water storage tank level gauge; 11-Working fluid storage tank; 12-Condensing pressure transmitter; 13-Condenser outlet automatic valve; a1~a4-Air condenser inlet; b1~b4-Air condenser outlet; c-Air condenser to storage tank inlet; d-Storage tank outlet; e-Working fluid inlet; f-Working fluid outlet; g-Evaporative condenser to storage tank inlet; h-Spray water pump suction inlet; i-Evaporative condenser water inlet; j-Make-up water pump suction inlet; k-Water storage tank inlet. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the scope of the present utility model.

[0018] This embodiment provides a combined wet and dry condensing system for ORC (Organic Refrigerant Control) systems, suitable for areas with limited annual water consumption. Through automatic control, it utilizes limited water resources to ensure ORC system performance and improve economic efficiency while meeting the heat source outlet temperature requirements. The system includes an air condenser 1, an evaporative condenser 3, a makeup water pump 8, a water storage tank 9, and a working fluid storage tank 11. The ORC system's turbine generator and working fluid pump are connected to the air condenser 1 and the working fluid storage tank 11, respectively. The air condenser 1 is connected to the evaporative condenser 3 and the working fluid storage tank 11. The evaporative condenser 3 is connected to the working fluid storage tank 11. The water storage tank 9 is connected to the makeup water pump 8, and the makeup water pump 8 is connected to the evaporative condenser 3.

[0019] In this embodiment, the air condenser 1 is provided with four air condenser inlets a1 to a4 and four air condenser outlets b1 to b4, the working fluid storage tank 11 is provided with an air condenser to storage tank inlet c, an evaporative condenser to storage tank inlet g, and a storage tank outlet d, the evaporative condenser 3 is provided with an evaporative condenser water inlet i, and the water storage tank 9 is provided with a water pump suction inlet j and a water storage tank inlet k.

[0020] The ORC system's turbine generator is connected to the air condenser inlets a1-a4, and the air condenser outlets b1-b4 are connected to the evaporative condenser 3 and the air condenser-to-storage tank inlet c. A bypass automatic valve 2 is installed on the connecting pipeline between the air condenser outlets b1-b4 and the evaporative condenser 3. A condenser outlet automatic valve 13 is installed on the connecting pipeline between the air condenser outlets b1-b4 and the air condenser-to-storage tank inlet c. The evaporative condenser 3 is connected to the evaporative condenser-to-storage tank inlet g, and the storage tank outlet d is connected to the working fluid pump. The evaporative condenser water inlet i is connected to the water supply pump 8, and a water supply regulating valve 7 is installed on the connecting pipeline between the water supply pump 8 and the evaporative condenser water inlet i. A condensing pressure transmitter 12 is installed on the working fluid storage tank 11. A water level gauge 10 is installed in the water storage tank 9. The water storage tank inlet k is used to supply external water flow into the water storage tank 9, and the water supply pump inlet j is connected to the water supply pump 8 to supply water in the water storage tank 9 into the evaporative condenser 3.

[0021] In this embodiment, a fan 4 is installed at the top of the evaporative condenser 3, and a spray water pump 6 is connected to the lower end of the evaporative condenser 3. A spray head and a working fluid heat exchange pipe are installed inside the evaporative condenser 3. The working fluid heat exchange pipe is located below the spray head, and the spray head is connected to the spray water pump 6. The air condenser 1 is connected to the working fluid heat exchange pipe installed inside the evaporative condenser 3, and the working fluid heat exchange pipe is connected to the working fluid storage tank 11. The spray water pump 6 sprays water from the lower part of the evaporative condenser 3 onto the working fluid heat exchange pipe through the spray head to achieve heat exchange. A condenser level gauge 5 is installed inside the evaporative condenser 3.

[0022] The working fluid heat exchange pipeline has a working fluid inlet e and a working fluid outlet f at both ends. The air condenser outlets b1 to b4 are connected to the working fluid inlet e to input the working fluid into the evaporative condenser 3. The working fluid outlet f is connected to the evaporative condenser-to-storage tank inlet g on the working fluid storage tank 11. The evaporative condenser 3 is also equipped with a spray water pump inlet h, which is connected to the spray water pump 6.

[0023] In the dry-condensation mode of the combined dry and wet condensation system, the exhaust gas of the organic working fluid at the turbine generator outlet is condensed only through the air condenser 1. The pipeline between the air condenser outlets b1-b4 and the evaporative condenser 3 is closed. The liquid working fluid flows into the working fluid storage tank 11 through the air condenser outlets b1-b4, and then flows from the working fluid storage tank 11 into the working fluid pump, thus participating in the ORC system cycle. In the combined dry and wet condensation mode, the exhaust gas of the organic working fluid at the turbine generator outlet is first cooled and partially condensed by the air condenser 1 before entering the working fluid heat exchange pipeline of the evaporative condenser 3 for condensation. The condensed organic working fluid flows to the working fluid storage tank 11, and then flows from the working fluid storage tank 11 into the working fluid pump, thus participating in the ORC system cycle.

[0024] In this embodiment, the start and stop of relevant valves and pumps in the ORC dry-wet combined condensing system are automatically controlled by the ORC system's built-in control system, thereby realizing the corresponding mode switching.

[0025] like Figure 1 As shown, when the condensing pressure is lower than the set value for the dry-wet combined condensation operation mode, the organic working fluid exhaust gas enters the air condenser 1 through the air condenser inlets a1 to a4 for condensation. At this time, the automatic valve 13 at the air condenser outlet is open, and the condensate flows into the air condenser through the air condenser outlets b1 to b4, enters the working fluid storage tank c, and flows into the working fluid pump through the storage tank outlet d to participate in the closed-loop circulation on the working fluid side of the ORC system. This is the dry condensation mode.

[0026] When the condensing pressure is higher than the set value for stopping the combined dry and wet condensing operation mode, the control system issues a command to start the spray water pump 6, fan 4, and makeup water pump 8. After receiving the command that the spray water pump 6, fan 4, and makeup water pump 8 have completed operation, the control system opens the bypass automatic valve 2. After the bypass automatic valve 2 is fully opened, the condenser outlet automatic valve 13 is closed. The organic working fluid exhaust gas passes through the air condenser inlet a1~a4 to the air condenser outlet b1~b4 to the working fluid inlet e to the working fluid outlet f to the evaporative condenser to the liquid storage tank inlet g, and finally flows into the working fluid pump through the liquid storage tank outlet d, participating in the closed-loop circulation of the working fluid side of the ORC system. At this time, the combined dry and wet condensing mode is entered.

[0027] When the condensing pressure is lower than the set value for stopping the combined dry and wet condensing operation mode, the control system issues a command to open the condenser outlet automatic valve 13. After the condenser outlet automatic valve 13 is fully opened, the bypass automatic valve 2 is closed. After the bypass automatic valve 2 is fully closed, the spray water pump 6, the fan 4, and the makeup water pump 8 are turned off after a delay. At this time, the system switches to the dry condensing mode.

[0028] In this embodiment, the ORC dry-wet combined condensing system includes a dry system and a wet system. The dry system uses an air condenser 1, and the wet system uses an evaporative condenser 3. Considering the annual meteorological data and water resource utilization possibilities of the implementation site, the operating mode is switched through the ORC system's built-in control system. That is, when the condensing pressure is lower than the set value, dry operation is adopted, i.e., the air condenser 1 operates independently; when the condensing pressure is higher than the set value, dry + wet system combined operation is adopted; when the condensing pressure is between low and high values, no switching is performed, and the original mode is maintained. The dry-wet combined cooling system is also equipped with a water storage tank 9, which can collect and store excess water at any time, extend the duration of extreme water use conditions, and improve the operating efficiency.

[0029] The main purpose of adopting a combined wet and dry condensing system is to save water to the maximum extent and solve the problem of space occupation in ORC systems. It can ensure condenser performance while meeting water usage restrictions, thereby ensuring the power generation performance of ORC systems and the stable operation of the entire process system, while also achieving the expected economic benefits.

[0030] This combined dry and wet cooling system is automatically controlled. It operates in dry mode when the outdoor ambient temperature is low and the condensing pressure is low, and in combined dry and wet mode when the outdoor ambient temperature is high and the condensing pressure is high. The entire switching process is automatically controlled by the program, which enables the ORC system to maintain high performance in all seasons and ensures that the heat source outlet temperature meets the design requirements.

[0031] This combined dry and wet cooling system uses a dry condensation mode during the cold winter season, without the involvement of spray water, eliminating the need to consider issues such as antifreeze, which greatly reduces the workload of ORC system operation and maintenance.

[0032] By adopting the above-disclosed technical solution of this utility model, the following beneficial effects are obtained:

[0033] This invention provides a combined dry and wet condensing system for ORC (Organic Refrigerant Container). Even under conditions of limited annual water consumption and space constraints, it can maintain the performance of the ORC system during the high-temperature period of summer, ensuring economy while maximizing water conservation. Both dry condensing mode and combined dry and wet condensing mode are automatically controlled by the system, resulting in higher reliability. An additional water storage tank can collect excess water from the site at any time; the water volume in the tank extends the operating time of the wet mode, further enhancing economic efficiency.

[0034] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A combined wet and dry condensation system for ORC, characterized in that: The system includes an air condenser, an evaporative condenser, a water pump, a water storage tank, and a working fluid storage tank. The ORC system's turbine generator and working fluid pump are connected to the air condenser and the working fluid storage tank, respectively. The air condenser is connected to the evaporative condenser and the working fluid storage tank. The evaporative condenser is connected to the working fluid storage tank. The water storage tank is connected to the water pump, and the water pump is connected to the evaporative condenser.

2. The ORC dry-wet combined condensation system according to claim 1, characterized in that: An automatic bypass valve is installed on the connecting pipe between the air condenser and the evaporative condenser.

3. The ORC dry-wet combined condensation system according to claim 1, characterized in that: An automatic valve for the condenser outlet is installed on the connecting pipeline between the air condenser and the working fluid storage tank.

4. The ORC dry-wet combined condensation system according to claim 1, characterized in that: A water supply regulating valve is installed on the connecting pipeline between the water supply pump and the evaporative condenser.

5. The ORC dry-wet combined condensation system according to claim 1, characterized in that: The working fluid storage tank is equipped with a condensation pressure transmitter.

6. The ORC dry-wet combined condensation system according to claim 1, characterized in that: The water storage tank is equipped with a water level gauge.

7. The ORC dry-wet combined condensation system according to claim 1, characterized in that: A fan is installed at the top of the evaporative condenser, and a spray water pump is connected to the lower end of the evaporative condenser. A spray head and a working fluid heat exchange pipe are installed inside the evaporative condenser. The working fluid heat exchange pipe is located below the spray head, and the spray head is connected to the spray water pump. The air condenser is connected to the working fluid heat exchange pipe installed inside the evaporative condenser, and the working fluid heat exchange pipe is connected to the working fluid storage tank. The spray water pump sprays water from the bottom of the evaporative condenser onto the working fluid heat exchange pipe through the spray head to achieve heat exchange.

8. The ORC dry-wet combined condensation system according to claim 7, characterized in that: The evaporative condenser is equipped with a condenser level gauge.

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