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为研究采用富氧燃烧方式煤粉锅炉的燃烧特性,利用Fluent软件对一台T型煤粉锅炉的富氧燃烧过程进行了数值模拟,得到了一次风含氧体积分数变化时炉膛内温度场、速度场和烟气各组分物质的量浓度的分布.结果表明:富氧条件下整个炉膛温度水平高于空气助燃条件下;当含氧体积分数由21%增大至33%时,炉膛平均温度由1 413.2K升高为1 447.1K;当含氧体积分数增大至27%时,炉膛平均温度变化较明显,达到1 435.6K;当含氧体积分数大于29%时,炉膛平均温度变化不明显;变一次风风量富氧燃烧方式的含氧体积分数最佳范围为27%～29%.
In order to study the combustion characteristics of pulverized coal-fired boilers with oxygen-enriched combustion, the Fluent software was used to simulate the oxygen-enriched combustion of a pulverized coal-fired boiler, and the temperature field, Velocity field and the concentration of the components in the flue gas.The results show that the temperature of the entire furnace under oxygen enrichment is higher than that under the conditions of air combustion; when the oxygen content increases from 21% to 33% The temperature increased from 1 413.2K to 1 447.1K. When the volume fraction of oxygen was increased to 27%, the average temperature of the furnace changed more obviously to 1 435.6K. When the oxygen content was above 29%, the average temperature of the furnace Obviously, the optimal range of oxygen content of oxygen-enriched combustion air volume is 27% -29%.