System and method for improving supercritical carbon dioxide power cycle thermal efficiency
A high-pressure carbon dioxide and carbon dioxide technology, applied in the direction of machines/engines, steam engine devices, mechanical equipment, etc., can solve the problems of increasing system complexity or cost, and achieve the effect of convenient implementation and low equipment cost
Inactive Publication Date: 2018-07-10
SHANGHAI POWER EQUIP RES INST
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Problems solved by technology
[0003] The technical problem to be solved by the present invention: while improving the overall thermal efficiency of the power cycle, do not increase the complexity or cost of the system too much
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[0024] Such as figure 1 As shown, a system for improving the thermal efficiency of a supercritical carbon dioxide power cycle provided by the present invention includes a compressor 1, a regenerator 2, a heat exchanger 3, a turbine 4, a precooler 5, a circulating water pump 6, and a water separator 7 , Generator 8. The various devices are connected by pipelines, and valves and instruments can be arranged on the pipelines according to the needs of system control. The compressor 1, the regenerator 2, the heat exchanger 3, the turbine 4, and the precooler 5 constitute a simple supercritical carbon dioxide circulation loop with heat recovery. Circulating water pump 6, heat exchanger 3, turbine 4, regenerator 2, and water separator 7 constitute a water injection bypass circulation loop. Other parts of the system include auxiliary facilities, electrical systems, instrument control systems, etc.
[0025] The present invention also provides a method for improving the thermal effici...
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The invention provides a system for improving supercritical carbon dioxide power cycle thermal efficiency. Another technical scheme of the invention provides a method for improving supercritical carbon dioxide power cycle thermal efficiency, and the method is characterized by using the above system. Compared with the prior art, beneficial effects of the system and the method are that through adding and injecting a bypass circulation, water is injected into a supercritical carbon dioxide power cycle, the water does work in a turbine and then enters a heat regenerator to release latent heat of phase change, then a water pump injects the water in a cycling manner, and water does not release heat to external environment, work done by the water in the turbine is much greater than work consumedby the water pump, and relatively substantial net work is realized. The system and the method would not increase too much complexity for a supercritical carbon dioxide power cycle, equipment requiredto be added is low in cost, and implementation of the system is convenient. The system and the method are suitable for cycles of an indirect heating method and a direct burning heating method.
Description
technical field [0001] The invention relates to a system for improving the thermal efficiency of a supercritical carbon dioxide power cycle and a method based on the system. Background technique [0002] The critical point of carbon dioxide is 31°C / 7.4MPa, and the state is supercritical when the temperature and pressure exceed the critical point. The research on using supercritical carbon dioxide as a working medium for power cycles began in the 1940s, and achieved phased research results in the 1960s and 1970s. Later, it was mainly due to the immature manufacturing technology of turbomachinery and compact heat exchangers. Suspended, until the beginning of this century, the research on this technology was revived. Due to the stable chemical properties of carbon dioxide, high density, non-toxicity, low cost, simple circulation system, compact structure, and high efficiency, the supercritical carbon dioxide power cycle is considered to be used in fossil energy power generatio...
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IPC IPC(8): F01K25/10F01K27/00F01K21/04
CPCF01K25/103F01K21/04F01K27/00
Inventor 黄志强郑开云
Owner SHANGHAI POWER EQUIP RES INST