The Flue Gas Denitration Process Selection And Optimization For300MW Generating Units Of HuaYu Power Plant

With increasing nitric oxide exhaust from fossil fuel combustion, the resulting ecological damages, such as greenhouse effect, acid rain, ozone depletion and photochemical smog, have attracted considerable attentions. In recent years, many large generators were used in power plants at different areas, and the environmental pollutions such as the fog and haze caused by nitric oxide occurred commonly throughout our country. Therefore, the equipment of denitration device becomes an inevitable choice for the power plants to satisfy the more and more strict request of the nitric oxide emission.This thesis introduced the development of the flue gas denitration technique and the control technique of the nitric oxide. The treatment can be divided into before fuel burning treatment and after fuel burning treatment, according to the forming characteristic of the nitric oxide released by fuel burning. Several low NOx combustion technologies were introduced in the department of the before fuel burning treatment. The Selective Catalytic Reduction (SCR) and Selective Non-Catalytic Reduction (SNCR) were introduced in the after fuel burning treatment. In SCR, principle of the SCR, constitute of the SCR denitration system, the kind of the SCR denitration catalyst and reductant were presented. We also analyzed and optimized the key factors, such as the selectivity of the flue gas denitration technique, denitration catalyst, ammonia system, and the main design parameters of the denitration technology system of the300MW generators of XinYang HuaYu power plant, according to its boiler parameters, wind blower parameters, air preheating parameters, and the request of the flue gas denitration engineering.We also investigated the adverse effects to the flue, steel frame, blower and air pre-heater of the denitration project to the original generator. In order to minimize these adverse effects, modification plan according to these matters was put forward and applied to the denitration transformation.The key issues of the denitration transformation were sufficiently studied and the actual parameters were optimized according to XinYang HuaYu power plant. The modification pan was successfully applied to the denitration transformation of this300MW generator. The effective property was tested, and the achieved denitration efficiency met the design requirements and the government limiting standard of the nitric oxide. In addition, the denitration transformation was finished safely, economically, energysavingly and environmentally, which also reached the expected social and economic benefit.The denitration transformation result which was actually examined and optimized can provide data support and reference for other660MW generator and similar project in future.