Design Optimization of 650 ℃ Ultra-supercritical Coal-fired Power Generation System with Single Reheat System

doi:10.3901/JME.2022.22.416

Abstract

Abstract: In order to solve the problems of high superheat degrees of regenerative extraction steams and large heat transfer temperature differences of air preheater in 650 ℃ single reheat advanced ultra-supercritical(A-USC) coal-fired power generation system, two optimized schemes(scheme 1 is integrated with two stages outside steam coolers(OSCs), while scheme 2 is simultaneously integrated with both OSCs and fronted air preheater(FAH) are proposed and compared on the base of the principle of energy level matching. The 650 ℃ A-USC coal-fired power generation system models are built by the Ebsilon software and the energy consumptions under off-design conditions are analysed with the unit consumption analysis method. The results show that the coal consumption of the 650 ℃ single reheat unit has remarkable coal saving effect compared with the 600 ℃ double reheat unit.The standard coal consumption of 650 ℃ single reheat unit is 10.67g·(kW·h)^-1 lower than that of the 600 ℃ double reheat unit, and 9.77% higher than that of the 700 ℃ single reheat unit(100%THA). The standard power generation coal consumptions of optimized scheme 2 are lower than those of scheme 1 and reference system under any working condition. The standard power generation coal consumption of scheme 2 is 246.71 g·(kW·h)^-1(100%THA), 3.32 g·(kW·h)^-1 lower than that of the reference system and 1.99 g·(kW·h)^-1 lower than that of the scheme 1.

Key words: 650 ℃, Advanced ultra-supercritical(A-USC), single reheat cycle, extraction steam superheat, OSC, unit consumption analysis

CLC Number:

TK212

WANG Jing, DUAN Li-qiang, YANG Ming. Design Optimization of 650 ℃ Ultra-supercritical Coal-fired Power Generation System with Single Reheat System[J]. Journal of Mechanical Engineering, 2022, 58(22): 416-425.

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