Design and operation experience of a 1000 MW ultra supercritical coal fired boiler with steam condition of 25.4 MPa 604/602°C

摘要

Steam temperature has been raised to 604/602°C at the Chugoku Electric Power Co., Inc., Misumi Thermal Power Station No. ] coal-fired, supercritical sliding pressure operation holler supplied by Mitsubishi Heavy Industries, Ltd. (MHI) with a vertical furnace water wall. The holler achieved high efficiency and low NOx emission with A-PM burner and MRS II pulverizer. This paper reports the holler's design features and operation results, e.g., (1) the highly reliable vertical furnace waterwall, which uses rifled tubing, (2) low NOx and low unburnt carbon in fly ash owing to the A-PM burner and MRS II pulverizer, and (3) the higher boiler efficiency of 91.8% and flexible boiler operation in coal exclusive firing at enough lower load than guaranteed minimum load of 30% (15% load was confirmed in trial operation).