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下花园发电厂 3号炉自投产以来 ,高温对流过热器曾数次出现超温、爆管现象。针对这一问题 ,在深入调研的基础上 ,进行了全方位的分析和计算 ,提出了改造方案 :高温对流过热器整体翻转 180°、并增加受热面。该厂进行了改造后的试运行、热力试验和验收工作。全部焊口都进行了射线检查 ,焊接质量的一次合格率大于 98% ,改造后主汽温度达到额定值 ,锅炉效率提高了 0 4 4%。本次改造的成功 ,对同类型机组锅炉的过热器改造具有一定的参考价值
Under the Garden Power Plant No. 3 since the commissioning of the furnace, high temperature convection superheater several times over-temperature, burst pipe phenomenon. In response to this problem, based on in-depth investigation and research, a full range of analysis and calculation were carried out, and a transformation plan was put forward: the high-temperature convection superheater was turned over by 180 ° as a whole, and the heating surface was increased. The plant after the transformation of the trial run, heat test and acceptance. All welds were carried out a ray inspection, welding quality of a pass rate of more than 98%, after the transformation of the main steam temperature reaches the rated value, the boiler efficiency increased by 44.4%. The success of this transformation has the certain reference value to the superheater reconstruction of the same type of unit boiler