โ Scribed by Minghou Xu; Jianwei Yuan; Shifa Ding; Handing Cao
No coin nor oath required. For personal study only.
For tangential coal fired boilers, the gas temperature deviation at the exit of the furnace will occur when boiler capacity becomes large. In this paper, the flow, heat transfer and combustion process in a boiler of 300 MWe unit at Shiheng Power Plant, Shandong, China and a boiler of 600 MWe unit at Shidongkou Power Plant, Shanghai are simulated. The causes and decrease ways of the gas temperature deviation are investigated. It is found that the gas temperature deviation results from the after twirl and the platen superheater. Decreasing the diameter of tangential circle formed by secondary air flow can result in the decrease of temperature deviation to a certain extent. Although the after twirl can be decreased by opposing the tangential direction of some secondary air flows, the Ilow field in the furnace might be disturbed, and the temperature deviation might be. increased, if the momentum and the angle of the opposite secondary air flow are not appropriate.
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