Electric Power ›› 2019, Vol. 52 ›› Issue (1): 161-165,173.DOI: 10.11930/j.issn.1004-9649.201808048

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Water-Wall Temperature Control of a 1 000 MW Dual Circle Tangential Firing Boiler during Wet-Dry Transferring Period

WANG Ya'ou, TAO Qian, XIAO Jie, CHEN Bo   

  1. Jiangsu Frontier Electric Technology Co., Ltd., Nanjing 211102, China
  • Received:2018-08-09 Revised:2018-09-18 Online:2019-01-05 Published:2019-01-14

Abstract: Aiming at the problems of water-wall overheating and large temperature deviations of the ultra-supercritical dual tangential circle boiler in the wet-dry transferring period, a three-stage control measure is adopted. Prior to the wet-dry transferring, the upper mills are put into operation to increase the boiler pressure and the feeding water temperature. During the transferring, an appropriate water/coal ratio and a superheating degree are settled and maintained. During the routine operation, the flame height should be kept as high as possible to improve the heat uniformity and the primary and secondary air distributions are adjusted to lower the "hot corner" temperature. In addition, the orifice plates of the overheated water-wall tubes are removed to increase the mass velocity. The results show that this measure has effectively alleviated the overheating of the water-wall and improved the water-wall operation conditions.

Key words: thermal power plant, ultra-supercritical unit, dual tangential circle boiler, wet-dry transferring, water-wall, overheating, thermal deviation

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