Operation control system and operation control method of SCO2 expansion machine

Abstract

The invention provides an operation control system of a supercritical carbon dioxide (SCO2) expansion machine, which is used for adjusting the pressure, temperature or flow of carbon dioxide. The system comprises an expansion machine, an expansion machine inlet gate valve, an expansion machine inlet adjusting valve, an expansion machine outlet gate valve, a bypass valve, a sealing gas inlet gate valve, an instrument gas adjusting valve, an electric heater and sealing gas adjusting valves, wherein the expansion machine comprises a high-pressure-stage expansion machine and a low-pressure-stage expansion machine; the expansion machine inlet gate valve and the expansion machine inlet adjusting valve are positioned on a pipeline between a boiler outlet and a high-pressure-stage expansion machine inlet; the expansion machine outlet gate valve is positioned at a low-pressure-stage expansion machine outlet; the bypass valve is positioned on a pipeline through which a working medium directly flows out of a part of the boiler outlet without passing through the expansion machine; the sealing gas inlet gate valve and the instrument gas inlet gate valve are respectively positioned on inlet pipelines for inputting sealing gas and instrument gas; the instrument gas adjusting valve is adjacent to the instrument gas inlet gate valve; the electric heater is adjacent to the sealing gas inlet gatevalve and is used for heating the input sealing gas; and the sealing gas adjusting valves comprise a high-pressure-stage sealing gas adjusting valve and a low-pressure-stage sealing gas adjusting valve which are respectively positioned on pipelines between the electric heater and a sealing gas inlet of the expansion machine.

Description

technical field [0001] The invention relates to the technical field of supercritical carbon dioxide Brayton power generation, in particular to a supercritical carbon dioxide (SCO 2 ) An operation control system and an operation control method of an expander. Background technique [0002] supercritical carbon dioxide (SCO) 2 ) power generation technology is based on supercritical CO 2 A new type of power generation technology as a working fluid, due to the particularity of the medium's physical properties, SCO 2 The power generation system has significant advantages such as high energy conversion efficiency, compact structure, and fast regulation response. It is a revolutionary new energy conversion technology. At present, there have been attempts at home and abroad to integrate SCO 2 Power generation technology is coupled with solar energy, nuclear energy, fossil energy and other energy sources, and several experimental systems with different power levels have been built...

AI Technical Summary

Problems solved by technology

The conventional power generation system does not have a separate pump circuit, so this process is only applicable to this experimental system, which is different from the method in which the main steam valve enters the steam to push the impeller to start and perform work in the conventional power generation system

[0007] In addition, the above-mentioned operation control process of the expander has not released more detailed information, and it does not involve the control process of the axial force and sealing gas, but the axial force and sealing gas pressure need to be paid attention to during the start-stop process of the expander If the parameters are not properly controlled, it is easy to cause equipment damage due to excessive axial force or out-of-control leakage

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