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采用振动炉排高温高压锅炉的生物质直燃发电技术被我国引进并推广。炉排的周期性振动会导致炉膛压力的周期性波动。由该文的分析可知,炉膛压力的波动可分为2个阶段:第1阶段炉膛压力的剧烈波动是炉排上燃料和灰渣形成的流动阻力随炉排振动产生周期性变化引起的;第2阶段炉膛压力的波动类似于燃煤锅炉的炉膛压力脉动,在给料系统稳定运行的前提下不会影响锅炉的稳定运行。仿真结果表明:合理设置炉排振动的时间和停振时间可以将炉膛压力的第1阶段波动控制在较小的安全范围内;合理的风量分配有利于稳定炉膛压力、改善燃烧情况、提高锅炉热效率。
The biomass direct-fired power generation technology using vibrating grate high-temperature and high-pressured boiler was introduced and popularized in our country. Periodic vibrations of the grate lead to periodic fluctuations in the hearth pressure. From the analysis of this paper, it can be seen that the fluctuation of furnace pressure can be divided into two stages: the violent fluctuation of the furnace pressure in the first stage is caused by the periodic variation of the flow resistance of the fuel and slag formed on the grate with the grate vibration; The fluctuation of the pressure in the second stage hearth is similar to the pressure pulsation in the hearth of a coal-fired boiler, and does not affect the stable operation of the boiler under the premise of stable operation of the feed system. The simulation results show that the reasonable setting of the grate vibration time and stopping time can control the fluctuation of the first stage of furnace pressure in a small safety range. The reasonable distribution of the air volume is helpful to stabilize the pressure of the furnace, improve the combustion situation and improve the thermal efficiency of the boiler .