哈密地区高碱煤掺烧结渣特性综合评价研究
Study on comprehensive evaluation of slagging characteristics of high-alkali coal blending combustion from Hami Area
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摘要: 为解决哈密高碱煤在掺烧过程中严重结渣的问题，选用新疆哈密大南湖地区神华二矿煤（高碱煤）与巴里坤地区保利煤（低碱煤）为研究对象，采用双色测温法对炉膛温度进行矩阵测量，研究不同煤种掺混比例和蒸汽吹灰对炉膛出口温度和温升的影响，并推算出基于炉膛出口温度的炉膛吹灰投运时间间隔。
结果表明：锅炉满负荷工况下，当神华二矿煤掺烧比例达到81.1%时，炉膛出口温度温升速率为17.4 ℃/h，吹灰后炉膛出口温度降幅度达到68 ℃，且炉膛吹灰最长间隔时间为6.7 h。随着神华二矿煤掺烧比例不断增加，炉膛结渣情况越严重，掺烧比例应控制在80%以下。现场试验采用逐步提高神华二矿煤比例的策略，神华二矿煤的掺烧比例从6台磨掺烧2台磨逐渐提高到5台。最佳掺烧方案是下5台磨煤机运行，其中A磨煤机烧保利煤，其余磨煤机烧神华二矿煤。Abstract: In order to solve the problem of serious slagging about Hami high-alkali coal blending combustion,taking two kinds of Shenhua No.2 Mine (high-alkali coal) from Dananhu Area and Balikun Baoli (low-alkali coal) from Balikun Area in Xinjing Hami as study objects,the effect of coal blending ratio and steam dust blowing on flue temperature at furnace outlet and temperature rise rate was investigated by using two-color pyrometry temperature detection system. In addition, the time interval of furnace soot-blowing was calculated based on flue temperature at furnace outlet.The results show that the blending ratio of Shenhua No.2 Mine coal was 81.1% when boiler running in full load condition, flue temperature rise rate at furnace outlet was 17.4 ℃/h, the decrease of furnace outlet temperature after furnace soot-blowing was 68 ℃, and the time interval of furnace soot-blowing was 6.7 h. The blending ratio of Shenhua No.2 Mine coal should be less than 80% in case of the more serious of slagging in furnace. The strategy of this field test was increasing proportion of Shenhua No.2 Mine coal. The blending proportion of Shenhua No.2 Mine coal was gradually increased from two mills among six mills to five mills. The best solution was that the boiler should put five mills inferior into operation, of which, mill A taking in Baoli coal, other mills taking in Shenhua No.2 Mine coal. -
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