外置床受热面防磨技术及应用

针对300 MW等级CFB锅炉机组外置床受热面存在的磨损、爆管、超温等现象,分析了外置床受热面的磨损机理及原因,提出了管卡结构优化、检修工艺优化、监测外置床受热面管束出口汽温、热强度高的管子绝热保温等防磨、防超温措施。介绍了600 MW CFB锅炉机组外置床设计结构,并将300 MW等级CFB锅炉机组外置床的成熟防磨技术应用于600 MW等级CFB锅炉机组,提高了机组的可靠性,取得了较好的效果。

Wear Proof Technology for EHE Heating Surfaces and Its Application

Aiming at the wearing, tube rupture and overheating phenomena existing in the external heat exchanger(EHE) of 300-MW CFBB units, mechanisms and reasons of the wearing are analyzed. A series of measures against abrasion and overheating, including the optimization of pipe clip structures and maintenance technologies; the monitoring of outlet steam temperature of EHE tubes, as well as the insulation capacity of high-calorific intensity tubes are proposed. The designed structure of EHE for 600-MW CFBBs is also presented in the paper and the wear proof measures for the 300-MW CFBB units are applied to the 600-MW units, which has improved the reliability of the unit with high efficiency.