超超临界1000 MW机组锅炉水冷壁壁温偏差计算分析及对策

发布时间：2018-09-01 12:20

【摘要】：针对平顶山电厂超超临界机组直流锅炉水冷壁壁温偏差过大的问题,本文根据锅炉结构特点和对冲燃烧特性,建立了1 000 MW机组对冲燃烧锅炉水动力计算模型,并通过对比计算结果和试验实测数据,反推锅炉热负荷分布,分析了造成锅炉水冷壁壁温偏差过大的原因,提出了相关应对措施。研究结果表明:该机组锅炉水冷壁壁温偏差过大主要是由炉膛内热负荷不均和流量分配不均引起,同时锅炉结构也对壁温偏差的敏感度有一定的影响;在高电负荷时,计算结果与实测数据能够较好地吻合,但中低电负荷时,水冷壁吸热偏差较大,通过反推,修正了热负荷分布,发现计算值与实测结果接近。建议在运行过程中注意调整同层旋流燃烧器的风粉均匀分配,在变负荷或扰动工况时控制好煤水比,在锅炉设计方面可以调整进入上炉膛前墙和后墙的流动截面比,使流量均匀分配。
[Abstract]:In order to solve the problem of excessive deviation of water wall temperature in once-through boiler of ultra-supercritical unit in Pingdingshan Power Plant, a hydrodynamic calculation model for 1 000 MW unit is established according to the boiler structure characteristics and combustion characteristics. By comparing the calculation results with the measured data, the heat load distribution of the boiler is reversed, and the causes of the excessive deviation of the water wall temperature of the boiler are analyzed, and the relevant countermeasures are put forward. The results show that the large wall temperature deviation of the boiler water wall is mainly caused by uneven heat load and uneven flow distribution in the furnace, and the boiler structure also has a certain influence on the sensitivity of the wall temperature deviation, and at high electric load, the structure of the boiler also has a certain influence on the sensitivity of the wall temperature deviation. The calculated results are in good agreement with the measured data, but when the electric load is low and low, the heat absorption deviation of the water wall is large. The distribution of heat load is corrected by backstepping, and it is found that the calculated value is close to the measured value. It is suggested that attention should be paid to adjusting the uniform distribution of air and powder in the same layer swirl burner during operation, controlling the ratio of coal to water well under variable load or disturbance conditions, and adjusting the flow cross-section ratio of the front wall and back wall into the upper furnace in the design of the boiler. Distribute the flow evenly.
【作者单位】：国家电投集团河南电力有限公司技术信息中心;国家电投集团河南电力有限公司平顶山发电分公司;西安交通大学动力工程多相流国家重点实验室;西安热工研究院有限公司;
【基金】：国家科技支撑计划项目(2015BAA03B01)~~
【分类号】：TM621.2

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