Supercritical carbon dioxide cycle power generation system
By introducing a dielectric recovery system into the supercritical carbon dioxide cycle power generation system, the problem of dielectric waste during rapid shutdown is solved, and the recovery and reuse of dielectric are realized, thereby improving the system's economy and efficiency.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- CHONGQING JIANGJIN SHIPBUILDING IND
- Filing Date
- 2025-12-05
- Publication Date
- 2026-07-23
AI Technical Summary
Existing supercritical carbon dioxide cycle power generation systems cannot effectively recover the supercritical carbon dioxide medium emitted in emergency situations when they shut down rapidly, resulting in resource waste.
A supercritical carbon dioxide cycle power generation system was designed, comprising a turbine, a compressor, a gas supply system, and a media recovery system. By setting emergency discharge regulating valves and pressure reducing valves for the turbine and compressor, combined with buffer tanks and coolers, the recovery and reuse of the media can be achieved.
This technology enables the recovery of supercritical carbon dioxide media emitted during rapid shutdowns, avoiding resource waste and improving the system's economy and efficiency.
Smart Images
Figure CN2025140410_23072026_PF_FP_ABST
Abstract
Description
A supercritical carbon dioxide cycle power generation system Technical Field
[0001] This invention relates to the field of supercritical carbon dioxide-based cyclic power generation systems, and particularly to a supercritical carbon dioxide cyclic power generation system. Background Technology
[0002] In existing supercritical carbon dioxide cycle power generation systems, when dealing with emergencies such as generator disconnection requiring rapid load reduction or equipment failure necessitating rapid shutdown, the system's operation involves urgently purging the supercritical carbon dioxide medium from the circulation system pipelines to protect the unit and reduce the load. This type of operation severely wastes the system's circulating medium and is not economical.
[0003] From the perspective of the economic efficiency of recycling, the supercritical carbon dioxide recycling power generation system is redesigned so that the system can recycle supercritical carbon dioxide in case of emergencies, thus avoiding waste. Summary of the Invention
[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a supercritical carbon dioxide cycle power generation system that can recover the supercritical carbon dioxide medium emitted in an emergency during a rapid shutdown.
[0005] The objective of this invention is achieved as follows:
[0006] A supercritical carbon dioxide cycle power generation system includes a turbine, a compressor, a system process medium circulation system, and a medium recovery system.
[0007] The system's process medium circulation system includes a gas supply system, which is used to replenish carbon dioxide medium. The gas supply system is connected in sequence to the high-pressure tank, the first cooler, the pressure stabilizing tank, and the compressor inlet via pipelines. The compressor outlet is connected in sequence to the regenerator heating channel, the heater, and the turbine inlet via pipelines. The turbine outlet is connected in sequence to the regenerator cooling channel and the first cooler via pipelines, forming a medium circulation. The turbine inlet end is also equipped with a turbine inlet emergency discharge port, and the compressor outlet end is also equipped with a compressor outlet emergency discharge port.
[0008] The media recovery system includes a turbine inlet discharge regulating valve installed at the turbine inlet emergency discharge port and a compressor outlet discharge regulating valve installed at the compressor outlet emergency discharge port. The turbine inlet discharge regulating valve is connected to a first pressure reducing valve via a pipeline, and the compressor outlet discharge regulating valve is connected to a second pressure reducing valve via a pipeline. The downstream ends of the first and second pressure reducing valves are connected via pipelines for mixing and cooling, and then connected in sequence via pipelines to a buffer tank and a second cooler. The outlet end of the second cooler is connected via pipelines to the compressor inlet and a reciprocating piston compressor, respectively. The reciprocating piston compressor is connected to a high-pressure tank.
[0009] Preferably, the first cooler and the second cooler are cooled by circulating cooling water so that the medium temperature reaches the compressor inlet design temperature.
[0010] Preferably, the gas supply system is shut off via a valve after being replenished with sufficient carbon dioxide medium.
[0011] Preferably, a bypass regulating valve is connected between the inlet and outlet of the turbine. The bypass regulating valve is used during the start-up process to allow the medium to circulate inside the turbine, increasing pressure and temperature. It is also used to divert the turbine's air intake in emergencies.
[0012] Preferably, an anti-surge regulating valve is connected between the inlet and outlet ends of the compressor to prevent compressor surge by adjusting the anti-surge regulating valve.
[0013] Preferably, it also includes a dry gas sealing system. When starting up, the sealing gas of the dry gas sealing system is supplied by the gas supply system. After the system medium circulation is established, the sealing gas of the dry gas sealing system is supplied by the compressor outlet, and the sealing gas supplied by the gas supply system is cut off at the same time.
[0014] Preferably, the buffer tank is equipped with a pressure transmitter and a temperature transmitter to monitor the temperature and pressure of the medium. An emergency vent valve is installed on the top of the buffer tank to prevent overpressure.
[0015] Thanks to the above-mentioned technical solution, this invention can recover supercritical carbon dioxide medium emitted in an emergency during a rapid shutdown. Attached Figure Description
[0016] Figure 1 is a schematic diagram of the system process;
[0017] Figure 2 is a schematic diagram of the media recovery system. Attached Figure
[0018] In the attached diagram, 1-heater, 2-turbine inlet discharge regulating valve, 3-regenerator, 4-compressor outlet discharge regulating valve; 5-pressure stabilizer; 6-compressor anti-surge regulating valve; 7-cooler; 8-turbine inlet bypass regulating valve; 9-integrated turbine compressor; 10-high pressure tank; 11-dry gas sealing system; 12-compressor pressure reducing valve; 13-turbine pressure reducing valve; 14-buffer tank; 15-cooler; 16-reciprocating piston compressor. Detailed Implementation
[0019] Referring to Figures 1 and 2, a supercritical carbon dioxide cycle power generation system is shown. It includes a turbine, a compressor, a system process medium circulation system, and a medium recovery system. The system process medium circulation system includes a gas supply system for supplying carbon dioxide medium. The gas supply system is connected sequentially via pipelines to a high-pressure tank, a first cooler, a pressure stabilizing tank, and the compressor inlet. The compressor outlet is connected sequentially via pipelines to a regenerator heating channel, a heater, and the turbine inlet. The turbine outlet is connected sequentially via pipelines to a regenerator cooling channel and the first cooler, forming a medium circulation. The turbine inlet end is also equipped with a turbine inlet emergency discharge port, and the compressor outlet end is also equipped with a compressor outlet emergency discharge port.
[0020] The media recovery system includes a turbine inlet discharge regulating valve installed at the turbine inlet emergency discharge port and a compressor outlet discharge regulating valve installed at the compressor outlet emergency discharge port. The turbine inlet discharge regulating valve is connected to a first pressure reducing valve via a pipeline, and the compressor outlet discharge regulating valve is connected to a second pressure reducing valve via a pipeline. The downstream ends of the first and second pressure reducing valves are connected via pipelines for mixing and cooling, and then connected in sequence via pipelines to a buffer tank and a second cooler. The outlet end of the second cooler is connected via pipelines to the compressor inlet and a reciprocating piston compressor, respectively. The reciprocating piston compressor is connected to a high-pressure tank.
[0021] The primary and secondary coolers are cooled by circulating cooling water to bring the medium temperature up to the compressor inlet design temperature. After the gas supply system is replenished with sufficient carbon dioxide, the supply is cut off via a valve. A bypass regulating valve is connected between the turbine's inlet and outlet. This valve is used during startup to allow the medium to circulate within the turbine, increasing pressure and temperature, and also for emergency diversion of turbine intake air. An anti-surge regulating valve is connected between the compressor's inlet and outlet to prevent compressor surge.
[0022] It also includes a dry gas sealing system. During startup, the sealing gas for the dry gas sealing system is supplied by the gas supply system. Once the system's medium circulation is established, the sealing gas for the dry gas sealing system is supplied by the compressor outlet, and the sealing gas supplied by the gas supply system is simultaneously cut off. The buffer tank is equipped with pressure transmitters and temperature transmitters to monitor the medium's temperature and pressure. An emergency vent valve is installed on the top of the buffer tank to prevent overpressure.
[0023] System working principle:
[0024] 1. Refer to Figure 1, System Process Media Circulation System:
[0025] 1) The external gas supply system replenishes carbon dioxide medium, which enters the compressor inlet pipeline after passing through the high-pressure tank 10, and then enters the compressor inlet after passing through the first cooler 7 and the pressure stabilizing tank 5 (used to stabilize the compressor inlet pressure).
[0026] 2) After being pressurized by the compressor, carbon dioxide enters the regenerator 3 (waste heat recovery and utilization) through the compressor outlet pipeline, and finally enters the heater 1 for heating.
[0027] 3) The heated carbon dioxide enters the turbine inlet through the outlet pipe to do work. After doing work, the carbon dioxide enters the regenerator 3 through the turbine outlet, where it exchanges the usable heat with the pressurized carbon dioxide medium in the compressor, thereby improving the cycle efficiency.
[0028] 4) After heat exchange, the carbon dioxide enters the first cooler 7 through the pipeline (it is cooled by circulating cooling water to reach the compressor inlet design temperature), and finally enters the compressor inlet through the pressure stabilizing tank 5, forming a cycle.
[0029] 5) After the external system resupply is completed, the resupply pipeline is shut off by a valve.
[0030] 6) There is a bypass regulating valve 8 between the turbine inlet and outlet pipelines, which is used for pressurizing and heating the medium during the start-up process, and also for diverting the turbine intake air volume in emergency situations.
[0031] 7) The anti-surge regulating valve 6 between the compressor inlet and outlet pipelines is used to prevent compressor surge regulation.
[0032] 8) When the dry gas sealing system 11 is started, the sealing gas is supplied by the external supply system and the high-pressure tank 10. After the system circulation is established, the sealing gas is supplied by the compressor outlet, and the external supply system is cut off at the same time.
[0033] 2. See Figure 2, Media Recovery System:
[0034] 1) The emergency discharge medium at the turbine inlet is high-temperature and high-pressure supercritical carbon dioxide, and the emergency discharge medium at the compressor outlet is low-temperature supercritical carbon dioxide. The turbine inlet discharge regulating valve 2 and the compressor outlet discharge regulating valve 4 are the emergency discharge valves at the turbine inlet and compressor outlet, respectively. In an emergency, the system circulation flow is reduced by controlling the valve opening, thereby reducing the unit load or even shutting down. The high-temperature medium discharged from the turbine enters the buffer tank 14 after passing through the second pressure reducing valve 13. The low-temperature medium discharged from the compressor outlet mixes and cools the turbine discharge medium after passing through the first pressure reducing valve 12, and finally enters the buffer tank 14.
[0035] 2) The buffer tank 14 is equipped with a pressure transmitter and a temperature transmitter to monitor the temperature and pressure of the medium. At the same time, an emergency vent valve is installed on the top of the tank to prevent overpressure.
[0036] The buffer pipe outlet line is connected to the second cooler 15. After being cooled by the cooler, carbon dioxide is connected to the compressor inlet line in one direction, so that it can continue to participate in the system circulation. The other direction is cooled and enters the reciprocating piston compressor 16. After being pressurized, it enters the high-pressure tank 10 for storage, which is convenient for subsequent filling system use.
[0037] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made to it in form and detail without departing from the scope defined by the claims of the present invention.
Claims
1. A supercritical carbon dioxide cycle power generation system comprising a turbine, a compressor, characterized by: It also includes the system process media circulation system and the media recovery system. The system's process medium circulation system includes a gas supply system, which is used to replenish carbon dioxide medium. The gas supply system is connected in sequence to the high-pressure tank, the first cooler, the pressure stabilizing tank, and the compressor inlet via pipelines. The compressor outlet is connected in sequence to the regenerator heating channel, the heater, and the turbine inlet via pipelines. The turbine outlet is connected in sequence to the regenerator cooling channel and the first cooler via pipelines, forming a medium circulation. The turbine inlet end is also equipped with a turbine inlet emergency discharge port, and the compressor outlet end is also equipped with a compressor outlet emergency discharge port. The media recovery system includes a turbine inlet discharge regulating valve installed at the turbine inlet emergency discharge port and a compressor outlet discharge regulating valve installed at the compressor outlet emergency discharge port. The turbine inlet discharge regulating valve is connected to a first pressure reducing valve via a pipeline, and the compressor outlet discharge regulating valve is connected to a second pressure reducing valve via a pipeline. The downstream ends of the first and second pressure reducing valves are connected via pipelines for mixing and cooling, and then connected in sequence via pipelines to a buffer tank and a second cooler. The outlet end of the second cooler is connected via pipelines to the compressor inlet and a reciprocating piston compressor, respectively. The reciprocating piston compressor is connected to a high-pressure tank.
2. The supercritical carbon dioxide cycle power generation system according to claim 1, characterized by: The first and second coolers use circulating cooling water to cool the medium, ensuring that the medium temperature reaches the compressor inlet design temperature.
3. The supercritical carbon dioxide cycle power generation system according to claim 1, characterized by: After the gas supply system is replenished with a sufficient amount of carbon dioxide medium, the supply is cut off through a valve.
4. The supercritical carbon dioxide cycle power generation system according to claim 1, characterized by: A bypass regulating valve is connected between the inlet and outlet of the turbine. The bypass regulating valve is used during the start-up process to allow the medium to circulate inside the turbine, increasing pressure and temperature. It is also used to divert the turbine's air intake in emergencies.
5. The supercritical carbon dioxide cycle power generation system according to claim 1, characterized by: An anti-surge regulating valve is connected between the inlet and outlet of the compressor. Adjusting the anti-surge regulating valve prevents the compressor from surging.
6. The supercritical carbon dioxide cycle power generation system according to claim 1, characterized by: It also includes a dry gas sealing system. During startup, the sealing gas for the dry gas sealing system is supplied by the gas supply system. Once the system medium circulation is established, the sealing gas for the dry gas sealing system is supplied by the compressor outlet, and the sealing gas supplied by the gas supply system is simultaneously cut off.
7. The supercritical carbon dioxide cycle power generation system of claim 1, wherein: The buffer tank is equipped with pressure transmitters and temperature transmitters to monitor the temperature and pressure of the medium. An emergency vent valve is installed on the top of the buffer tank to prevent overpressure.