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2008•Guangdong Electric PowerRequires access

Analysis and Treatment of MP Feedwater Safety Valve Operation in Waste Heat Boiler

Sun Shi-qi

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Abstract

During the startup of a gas-steam combined cycle unit in some power plant,the overpressure of the MP economizer in the waste heat boiler resulted in the operation of the MP feedwater safety valve.Upon structural and operational analysis of the MP and LP systems,the overpressure was deemed to be caused by the increased MP drum level during startup,which led to fast closing of the MP feedwater control valve located behind the economizer and the great heat absorption by the economizer feedwater.It was suggested that the economizer feedwater should be kept flowing.Accordingly,electrically operated stop valve and steam operated control valve were added to the drainage common header of MP economizer,and tiny opening was left after closing the MP feedwater control valve.Operation results thereafter show that the MP feedwater pressure is satisfactory.

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What this paper is about

During the startup of a gas-steam combined cycle unit in some power plant,the overpressure of the MP economizer in the waste heat boiler resulted in the operation of the MP feedwater safety valve.Upon structural and operational analysis of the MP and LP systems,the overpressure was deemed to be caused by the increased MP drum level during startup,which led to fast closing of the MP feedwater control valve located behind the economizer and the great heat absorption by the economizer feedwater.It was suggested that the economizer feedwater should be kept flowing.Accordingly,electrically operated stop valve and steam operated control valve were added to the drainage common header of MP economizer,and tiny opening was left after closing the MP feedwater control valve.Operation results thereafter show that the MP feedwater pressure is satisfactory.

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Available abstract

During the startup of a gas-steam combined cycle unit in some power plant,the overpressure of the MP economizer in the waste heat boiler resulted in the operation of the MP feedwater safety valve.Upon structural and operational analysis of the MP and LP systems,the overpressure was deemed to be caused by the increased MP drum level during startup,which led to fast closing of the MP feedwater control valve located behind the economizer and the great heat absorption by the economizer feedwater.It was suggested that the economizer feedwater should be kept flowing.Accordingly,electrically operated stop valve and steam operated control valve were added to the drainage common header of MP economizer,and tiny opening was left after closing the MP feedwater control valve.Operation results thereafter show that the MP feedwater pressure is satisfactory.

Key concepts: Economizer, Boiler feedwater, Feedwater heater, Boiler (water heating), Control valves, Overpressure, Safety valve, Waste management

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Analysis and Treatment of MP Feedwater Safety Valve Operation in Waste Heat Boiler — Research Paper | ScholarLens