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针对某电厂2号机组改造后由原设计燃料淮南大通烟煤改烧生物质燃料的现状,首先采用Fluent软件模拟了抛煤口改为一次风口并加大二次风量后的炉内流场;其次,对前后二次风射流角度进行了调整,模拟了二次风角度调整后的炉内流场;在确定二次风射流角度后,又模拟了不同风量配比条件下的炉内流场,对比分析得到最佳风量配比条件;在配风系统改造方案实施后,对新配风系统的炉内冷态流场进行了火花示踪试验和研究.结果表明:机组经改造后,炉内的流场比较合理,一次风无明显偏斜,二次风切入一次风主流的位置合理,为机组的热态调试和运行提供了参考依据.
Aiming at the status quo of reforming biomass fuels from the original design of Huainan Datong bituminous coal after the reformation of Unit 2 in a power plant, the fluent software is used to simulate the flow field of the coal thrown into a primary tuyere and to increase the secondary air flow rate. Secondly, , The angle of the front and rear secondary air jets was adjusted to simulate the flow field inside the furnace after the secondary air angle was adjusted. After the secondary air jets angle was determined, the flow field inside the furnace under different air volume ratios was simulated, After the implementation of the air distribution system reforming program, the spark tracing experiments and research on the cold flow field in the new air distribution system were carried out. The results show that after the unit is transformed, The flow field is more reasonable, the primary air has no obvious deviation, and the position where the secondary air is cut into the primary air is reasonable, which provides a reference for the thermal commissioning and operation of the unit.