热电厂循环流化床锅炉结焦问题分析语及预防处理.docVIP

热电厂循环流化床锅炉结焦问题分析语与预防处理摘　要：作者就热电厂循环流化床锅炉出现的结焦问题，进行了原因分析，一是床料对结焦的影响，二是灰熔点对结焦的影响，三是燃料特性对结焦的影响，四是密相区的燃烧份额对结焦的影响，从而对结焦提出了十一种处理方法和预防措施，在实践应用中取得了良好的效果，为热电厂带来了经营效益，在同类型循环流化床锅炉运行中有很好的借鉴作用。关键词：循环流化床锅炉；结焦；流化；原因分析；措施?CFB Boiler forms Burnt Analysis and PreventsSummary : The author analyse after carrying on the reason on the issue that knot that the circulation fluidized bed boiler of heat and power plant appears is burnt , first, the bed material , to forming the influence of the coke, second, the gray point is right to form burnt influence, third, fuel characteristic to form burnt influence, fourth , dense looks burning to form burnt influence share of district, thus to forming and proposing 11 kinds of treatment methods and precautionary measures burntly , have made the good result in practice is used, having brought benefit of managing to the heat and power plant, there is very good reference function in the fluidized bed boiler of circulation of the same type is operated.Keyword: Circulation fluidized bed boiler; Form burntly ; Flow and melt; Reason analysis; Measure.0?????? 前言????? 韶钢热电厂循环流化床锅炉在运行的有一台120t/h的循环流化床锅炉，在建的有三台220t/h循环流化床锅炉，在运行中常发生结焦事故，预防结焦事故的发生是一个重要的课题，本文就循环流化床结焦问题提一些自己的看法。1?????? 设备简介????? 韶钢热电厂一站有一台东方锅炉厂生产的120t/h次高温次高压循环流化床锅，2001年建成投产，锅炉为单锅筒自然循环、集中下降管、л型布置并掺烧20％高炉煤气的燃煤循环流化床锅炉，燃煤设计采用本地韶关劣质煤，物料分离采用绝热式高温旋风分离器，回料器采用“J”阀系统，锅炉点火采用床上焦炉煤气点火，设三支焦炉煤气点火枪，炉膛中部采用左右各四支对冲式高炉煤气烧嘴，锅炉减温系统采用除盐水喷水减温，锅炉炉膛为全膜式水冷壁悬吊结构。脱硫系统采用炉膛与煤混加石灰石的方式，锅炉排渣系统采用侧排式选择性冷渣器。锅炉设计主要参数：? 序号??? 项??????? 目??? 符号??? 单? 位? 100％煤?? 80％煤+20％高炉煤气? 1???? 额定蒸发量???????? D???? t/h?????? 120?????? 120? 2???? 过热蒸汽出口温度?? t???? ??????? 485?????? 485 ? 3???? 过热蒸汽出口压力?? P???? MPa(表压) 5.3?????? 5.3? 4??? 给水温度??????????? tw???? ?????? 150?????? 150? 5??? 空预器进口风温????? ta???? ?????? 20 ℃????? 20? 6??? 汽包工作压力??????? Pd??? MPa?????? 5.72????? 5.72?? ? 7??? 过热蒸汽减温水量??? D1??? t/h?????? 3.422????? 3.78? 8??? 燃煤耗量??????????? Qf???? t/h????? 22.808???? 18.25? ?9???? 高炉煤气耗量????????????? Nm3/h???????????????