Split flow regulation and control system for supercritical carbon dioxide recompression cycle

Abstract

The invention discloses a split flow regulation and control system for supercritical carbon dioxide recompression cycle. The system comprises a carbon dioxide storage subsystem, a recompression cycle subsystem, a deflation subsystem and an automatic control subsystem, wherein the carbon dioxide storage subsystem is used for storing carbon dioxide and providing a carbon dioxide source for the recompression cycle subsystem; the recompression cycle subsystem is used for receiving the filling of carbon dioxide from the carbon dioxide storage subsystem, controlling the gas supply of the carbon dioxide storage subsystem through the automatic control subsystem, controlling the deflation of the deflation subsystem and regulating and controlling the split flow coefficient in the recompression cycle subsystem, so that stable and continuous circulating operation of the recompression cycle subsystem is realized; the deflation subsystem is connected with the recompression cycle subsystem and used for vacuumizing the recompression cycle subsystem when the recompression cycle subsystem is filled with carbon dioxide; and the automatic control subsystem is used for automatically realizing filling or gas supplementing of carbon dioxide, vacuumizing and deflation of the deflation subsystem, and regulating and controlling the split flow coefficient in the recompression cycle subsystem to enable the recompression cycle subsystem to stably operate.

Description

technical field [0001] The invention relates to the technical field of energy power generation, in particular to a split control system for supercritical carbon dioxide recompression cycle. Background technique [0002] Supercritical carbon dioxide Brayton cycle power generation technology is a cutting-edge technology for improving energy utilization and an important way to achieve energy green development. Compared with the widely used steam Rankine cycle and helium Brayton cycle, the supercritical carbon dioxide recompression Brayton cycle has higher thermal efficiency under the same conditions, and reduces the cost of components such as compressors, heat exchangers, and turbines. size, making the system easier to compact and modularize. In the commissioning process of the supercritical carbon dioxide recompression cycle system, the adjustment of the split coefficient is an important factor affecting the efficiency of the cycle system. Because the properties of supercrit...

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Problems solved by technology

In the published patents, there is currently no split control system for supercritical carbon dioxide recompression Brayton cycle. It is necessary to consider the influence of the split coefficient on the position of the regenerator pinch point and cycle performance during the commissioning process, and how to realize the recompression cycle. Control method for system split ratio optimization

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