Supercritical carbon dioxide turbine shaft seal gas supply and leaked gas recovery system and method

Abstract

The invention discloses a supercritical carbon dioxide turbine shaft seal gas supply and leaked gas recovery system and method. The system comprises a compressor outlet shaft seal gas source supply pipeline, a low-temperature heat regenerator cold side outlet shaft seal gas source supply pipeline and a shaft seal leaked gas recovery system. According to the compressor outlet shaft seal gas source supply pipeline, a compressor outlet is connected with a high-pressure storage tank inlet, a high-pressure storage tank is divided into two paths, one path is connected with a shaft seal gas supply main pipe through an electric heating oil heater, a regulating valve and the like, and the other path is connected with a shaft seal gas supply desuperheater through a regulating valve and the like; according to the low-temperature heat regenerator cold side outlet shaft seal gas source supply pipeline, a low-temperature heat regenerator cold side outlet is connected to the shaft seal gas supply main pipe through an adjusting valve and the like; and according to the shaft seal leaked gas recovery system, a shaft seal leaked gas pipeline is sequentially connected with a shaft seal leaked gas cooler, a shaft seal leaked gas conveying pump and a surge tank. According to the system, under different working conditions of starting, grid-connected power generation, thermal state trip, load shedding and the like, safe and efficient operation of a supercritical carbon dioxide cycle generator set is achieved by switching different shaft seal gas supply sources and recycling leaked gas.

Description

technical field [0001] The invention belongs to the technical field of shaft seal systems of rotating machines, and in particular relates to a supercritical carbon dioxide turbine shaft seal gas supply and leak gas recovery system and method. Background technique [0002] Supercritical carbon dioxide cycle power generation technology has broad application prospects in the field of energy and power because of its advantages such as high cycle thermal efficiency, compact system equipment, and wide adaptability of heat sources. In recent years, many research institutions have carried out systematic and in-depth research on supercritical carbon dioxide cycle power generation technology, involving thermophysical properties of working fluid, thermal cycle mechanism analysis, system design optimization, research and development of equipment components, etc. With the continuous deepening of relevant theoretical and experimental research, supercritical carbon dioxide cycle power gene...

AI Technical Summary

Problems solved by technology

The supercritical carbon dioxide turbine is a rotating machine. The rotating rotor passes through the stationary cylinder of the turbine. There must be a gap between the bearings on both sides of the turbine, which may cause the turbine chamber to be damaged during the operation of the supercritical carbon dioxide turbine. Carbon dioxide working fluid leaks out or outside air enters the turbine chamber, which affects the safe and efficient operation of supercritical carbon dioxide turbines. Therefore, it is very important to design a reasonable and efficient shaft seal system for supercritical carbon dioxide turbines.

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