关键词: 300 MW等级火电机组, 循环流化床锅炉, 煤粉锅炉, 可靠性, 非计划停运

Abstract: In order to quantitatively analyze the differences between the reliabilities of the 300-MW class circulating fluidized bed (CFB) boiler units and the pulverized coal(PC) boiler units in China, the statistics on the reliability data of major 300-MW class CFB boiler units and pulverized coal boiler units are conducted, in which the reliability and the outage comprehensive indices are compared. The results show that though the reliability indices of the CFB units have been greatly improved and the number of unplanned outages has been reduced greatly from 2.48 times/(unit?year) in 2011 to less than 0.75 times/(unit?year) in 2014, the forced outage times and the equivalent forced outage rate have been reduced from 1.97 times/(unit?year) and 3.7% in 2011 to 0.62 times/(unit?year) and 1.18% in 2014 respectively, they are still 0.30 times/(unit?year), 0.20 times/(unit?year) and 0.87% higher than the indices of the pulverized coal boiler units in 2014 respectively and the average unplanned outage interval hours are 6 158.90 h less than the pulverized coal boiler units. Therefore, the reliabilities of CFB boiler units need to be further improved.

Key words: 300-MW thermal power unit, circulating fluidized bed boiler, pulverized coal boiler, reliability, unplanned outage