Anti-surge early warning control method of COREX gas compressor

Abstract

The invention discloses an anti-surge early warning control method of a COREX gas compressor, and relates to control over gaseous fuel supply of a gas turbine and a device, in particular to an anti-surge detection, early warning and adjustment control method of the gas compressor of a CCPP (Combined Cycle Power Plant). The method comprises the following steps of: acquiring compressor inlet conditions through a CCPP monitoring system; determining safety margin, a surge line, a control line and a step protection line; if an operating point (RP) is positioned in a control region adjacent to the control line, linearly adjusting the opening of an anti-surge valve by using a PI adjustment algorithm; and if the operating point is positioned in a control region adjacent to the surge line SLL, performing step control over the opening of the anti-surge valve. According to the method, effective early warning and control adjustment functions can be effectively generated for the operating conditions of a low-voltage coal crusher and a high-voltage coal crusher of the CCPP and an operation state of the entire gas system, the problem of high failure rate of the COREX combined gas-steam combined cycle generating unit can be effectively solved, and the safety and the stability of the unit are improved.

Description

technical field [0001] The invention relates to the control of the gaseous fuel supply of gas turbines and devices, in particular to a surge detection, early warning and adjustment control method for a gas compressor of a COREX gas gas-steam combined cycle generator set. Background technique [0002] COREX combined gas-steam combined cycle unit (referred to as CCPP unit) is a large-capacity generator set that uses COREX medium calorific gas as the main fuel and light oil as the auxiliary fuel. Its process is far more complicated than conventional combined cycle units. During the operation of the CCPP unit, due to the large fluctuations in the flow rate of the COREX gas output during the production process of the COREX ironmaking process, the gas compressor, the core equipment of the gas system, frequently surges, resulting in fluctuations in the pressure, temperature and flow of the gas at the outlet of the gas system Larger, fluctuations in unit load and gas pipeline networ...

AI Technical Summary

Problems solved by technology

[0004] 1. Although the high and low pressure COREX gas compressors are each equipped with an anti-surge valve, due to the large fluctuations in flow and pressure of the gas system during the operation of the CCPP unit, it is easy to cause the two anti-surge valves to fail to close, seriously affecting the stability of the entire unit sex

[0005] 2. The existing high and low pressure anti-surge valve control adopts a special controller independent of the CCPP unit monitoring network, and the operating personnel cannot monitor its status through the CCPP unit monitoring system

[0006] 3. The existing CCPP units lack anti-surge judgment and analysis and control means, and the operators are helpless to deal with frequent surge failures

[0010] However, none of these existing technical solutions solves the problem of lack of anti-surge judgment and analysis and control means in the operation of CCPP units, nor does it consider anti-surge adjustment in the case of large gas flow and pressure fluctuations in the CCPP unit monitoring system The problem of monitoring, especially the anti-surge valve cannot be completely closed during the operation of the unit, so as to maintain the working condition of flow regulation

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