Aiming at the problem about local over-temperature of the water wall of Tashan No.3 boiler during deep peak-regulating period,it introduces the grey relational analysis into the diagnosis of collecting 30 common related parameters to form a comparison sequence.By calculating the grey correlation coefficient,it quickly locks the main adjusting object,namely mill sets output.By mill switching and output changing test,the paper analyses the influence law on local over-temperature.On this basis,a method to solve local over-temperature of water wall based on the differential distribution of powder amount is proposed.The test reduces the powder amount of No.3 and No.4 corners of mill A and B by-5％,-6％,-7％,then the maximum temperature of front wall drops by 22℃,37℃,53℃,and right wall by 11℃,17℃,36℃ respectively,meanwhile,the wall temperature of adjacent spots are also significantly reduced.It provides an innovative and effective idea to solve the over-temperature of supercritical tangentially fired boiler under low load.
关键词
水冷壁/局部超温/灰色关联分析/粉量差异化分配
Key words
water wall/local over-temperature/grey relational analysis/differentiated distribution of powder amount
维普
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