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循环流化床(CFB)是一种低成本有效降低NOx、SOx等排放量的洁净煤燃烧技术,近年来一直深受世界各国的普遍重视,并得到了迅速发展。底灰系统是循环流化床锅炉的重要组成部分,底灰系统不仅除去约40%～60%的燃烧灰,还需要除去脱硫剂及产物CaSO4并回收一部分热量,其设计和运行均有许多独到之处。底灰系统由底灰排放系统、底灰的分级和热量回收系统以及底灰的冷却和输送系统等三部分组成,其主要设备包括布风板排灰管、水冷绞龙及底灰输送和水冷绞龙及底灰输送等。锅炉底灰系统在运行过程经常发生炉膛进渣口及排灰管堵塞、底灰冷却器排灰温度高和底灰冷却器排灰管堵塞与结焦等故障,在循环流化床的运行中具有普遍性,经过文中所述的设备改造和运行优化,已得到有效缓解。本文介绍的循环流化床锅炉底灰系统的结构和运行特点对循环流化床锅炉底灰系统的设计和运行具有指导意义。
Circulating fluidized bed (CFB) is a kind of clean coal combustion technology that can effectively reduce the emission of NOx, SOx and other emissions at a low cost. In recent years, it has been widely valued by all countries in the world and has been rapidly developed. Bottom ash system is an important part of circulating fluidized bed boiler, the bottom ash system not only remove about 40% to 60% of the combustion ash, but also need to remove the desulfurization agent and product CaSO4 and recover part of the heat, the design and operation of many unique Where. The bottom ash system consists of a bottom ash discharge system, a bottom ash classification and heat recovery system, and a bottom ash cooling and conveying system. The main equipment includes a windshield ash discharge pipe, a water cooled auger and a bottom ash conveying and water cooling Auger and bottom ash transport and so on. Bottom ash system in the operation of the furnace often occurs in the slag into the slag outlet and exhaust pipe clogging at the end of the ash cooler ash discharge temperature and the end of the ash cooler exhaust pipe clogging and coking and other failures in the operation of the circulating fluidized bed has Universality, through the transformation and operation of the equipment described in the optimization, has been effectively alleviated. The structure and operation characteristics of CFB boiler bottom ash system introduced in this paper are instructive for the design and operation of CFB boiler bottom ash system.