2045t/h锅炉主蒸汽温度偏低问题的分析与处理

ANALYSIS AND TREATMENT OF SOMEWHAT LOWER MAIN STEAM TEMPERATURE PROBLEM FOR 2045 t/h BOILER

对某电厂2045t/h锅炉主蒸汽温度偏低问题进行了分析,认为其原因主要是炉膛蒸发受热面面积和过热器受热面面积分配不合理。通过采取减少省煤器面积,增加低温过热器受热面,抬高燃烧器高度以及对水冷壁出口管进行保温等方法,使主蒸汽温度、再热蒸汽温度都提高到额定值540℃,排烟温度也控制在140℃设计值,飞灰可燃物没有增加,锅炉效率达到94.14%。

The problem of somewhat lower main steam temperature for 2045 t/h boiler in one power plant has been analysed. It is believed that the cause is mainly due to unreasonable distribution of steamrelieving heating surface area in the furnace and heating surface area of the superheater. For this reason, many methods, such as reducing the area of economizer, increasing heating surface of the lowtemperature superheater, raising the height of burners, and carrying out thermal isolation of outlet pipes of the waterwall etc., have been adopted, making the main steam temperature and the reheated steam temperature all being enhanced to the rated value of 540 ℃, the exhaust gas temperature being also controlled to a designed value of 140 ℃, the combustibles in fly ash having not in creased, the boiler efficiency having reached to 94.14%.