By Hu Yaqi, Zhejiang Guohua Zheneng Power Generation Co., Ltd. and Steve Craig, Fluid Components International LLC (FCI)
To meet China’s growing need for electric power generation, the Guohua Ninghai Power Plant has a total planned operating capacity of 4 x 600 MW [Phase 1]. The plant is located south of Shanghai in Ninghai township, Ningbo city, Zhejiang province and serves the electric power needs in the region.
The Ninghai plant relies on coal-fired steam driven turbine to generate electricity with six sets of HP-983 medium speed coal mills supporting a tangentially corner-fired boiler. The plant’s large production operations are complex.
Coal is first fed from silos at the plant to coal mill pulverizers, which grinds the coal to a fine powder. A fan forces a flow of blended primary ambient air and pre-heated air into the coal mill where the air and coal powder are mixed to provide combustion air to a furnace, heating water in a boiler which produces steam to drive power-generating turbines. The plant’s sophisticated energy efficient boiler control system requires accurate and responsive air flow measurement.