Closed purge system and method applicable to supercritical carbon dioxide Brayton cycle

Abstract

The invention discloses a closed purge system and method applicable to a supercritical carbon dioxide Brayton cycle. The closed purge system comprises a throttling device mounted on a turbine bypass pipeline, a particle collector, a first filter, a second filter and a targeting device, wherein the particle collector and the first filter are mounted on a high temperature side inlet pipeline of a high temperature heat regenerator; the second filter and the targeting device are mounted on an inlet pipeline of a main compressor; and a pipe section in front of a turbine main steam valve is vertically arranged, and other two pipelines connected with a tee joint which is connected with the pipe section in front of the turbine main steam valve are arranged horizontally. The invention further discloses a purge method of the system. According to the characteristics of a supercritical carbon dioxide Brayton cycle power generation system, system equipment is fully used, and the system purge function is achieved through the lowest possible engineering modification amount, adding of the fewest possible temporary equipment and little carbon dioxide working medium consumption.

Description

technical field [0001] The invention belongs to the technical field of thermal power generation, and in particular relates to a closed-type purging system and method suitable for supercritical carbon dioxide Brayton cycle of thermal power generating set equipment and pipelines. Background technique [0002] The supercritical carbon dioxide Brayton cycle power generation system can achieve about 50% power generation efficiency under the condition that the turbine inlet temperature is 600°C, and the conventional steam Rankine cycle power generation system can achieve the same power generation when the turbine inlet temperature is 700°C efficiency. Due to the limitation of the technical level of high-temperature materials, the 700°C generator set is only in the stage of experimental verification, and there is still a long way to go before commercial application. Therefore, the supercritical carbon dioxide Brayton cycle is expected to become an alternative to the conventional s...

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Problems solved by technology

However, when purging with carbon dioxide working fluid, because the purging flow rate is very large, the purged carbon dioxide cannot be directly emptied.

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