1000MW二次再热塔式炉塌灰机理及预防

Formation Mechanism and Preventive Countermeasures of Ash Collapsing in 1000 MW Double-reheat Tower Type Boiler

针对某1000 MW二次再热塔式炉塌灰事故,文中主要从其受热面的结构参数、烟气流速、燃用煤质等方面进行了塔式锅炉积灰特性的研究。还分析了此次受热面塌灰的诱因和危害,并解释了塌灰过程中炉膛压力变化的原因。进一步提出了避免锅炉受热面在低负荷运行时积灰严重的措施,可以避免塌灰事故频繁发生,对同类型锅炉运行具有借鉴意义。

Research on the ash deposition characteristics of tower boilers is carried out fl＇om the aspects ot structural parameters, flue gas flow rate, and burning coal quality of the heating surface, tbr an ash collapsing accident in 1000 MW double-reheat tower type boiler. The causes and hazards of the heating surface ash deposition is also analyzes, and the reasons for the change of furnace pressure during the process of ash collapsing is explained. Measures to avoid serious ash deposition were put forward when the boiler heating surface operates in the low load, which can avoid frequent occurrence of ash collapsing accidents. It is of reference to the operation of the same type of boiler.