中储式制粉系统燃煤锅炉低氮燃烧技术改造与优化  

Retrofitting andoptimization of low NO_(x) combustion technology for coal⁃fired boiler with intermediate storage bunker coal pulverized system

作　　者：林国辉 姜国强 赵丽 陈晓玮 谭厚章[2] 施子福 陶振涛 LIN Guo-hui;JIANG Guo-qiang;ZHAO Li;CHEN Xiao-wei;TAN Hou-zhang;SHI Zi-fu;TAO Zhen-tao(Zhejiang Juhua Thermal Power Co.,Ltd.,Quzhou 324004,China;School of Energy and Power Engineering,Xi'an Jiaotong University,Xi'an,710049,China;State Key Laboratory of Clean Energy Utilization,Zhengjiang University,Hangzhou 310027,China)

机构地区：[1]浙江巨化热电有限公司,浙江衢州324004 [2]西安交通大学热流科学与工程教育部重点实验室,陕西西安710049 [3]浙江大学能源清洁利用国家重点实验室,浙江杭州310027

出　　处：《能源工程》2023年第2期69-74,共6页Energy Engineering

摘　　要：为了解决浙江巨化热电有限公司9号锅炉(容量440 t/h,中储式制粉系统)运行中存在高NO_(x)排放、效率低、过热器超温、锅炉出力不足等问题,基于空气分级燃烧的低NO_(x)燃烧技术,对机组风烟系统进行了技术改造。改造结果表明:将排粉风机出口乏气(三次风)通过乏气母管送入一次风母管,降低一次风速和风温,同时将原一次风作为二次风,采用缩腰式配风方式,不仅可以有效减少锅炉的不完全燃烧热损失,提高锅炉运行的热效率,达到最大负荷运行,消除炉膛尾部烟气超温问题,同时也能降低NO_(x)排放量。该技术优化改造,可以使脱硝装置进口NO_(x)浓度降低至268 mg/m^(3),脱硝装置的喷氨量和氨逃逸大幅下降,锅炉稳定最大出力从345 t/h上升为420 t/h,年运营成本降低约488万元。In order to solve the problems of high NO_(x) emission,low efficiency,superheater overtemperature and insuffi⁃cient boiler output in a boilerof a thermalpower plant.The air and flue gas system was technically retrofitted based on the low NO_(x) combustion technology with using air staged combustion.The results after retrofitting shows that the exhaust gas(tertiary air)at the outlet of the powder exhaust fan was sent to the main pipe of primary air through the main pipe of exhaust gas forreducing the speed and temperature of primary air.At the same time,the original primary air acted as the secondary air,and the waist shrinking secondary air distribution method was adopted,which could not only effec⁃tively reduce the incomplete combustion heat loss of the furnace,but also improve the thermal efficiency of boiler opera⁃tion,and achieve maximum unit load and eliminate the problem of flue gas overtemperature at the end of the furnace.At the same time,the NO_(x) emission from the boiler was reduced.This technical retrofitting could reduce the NO_(x) con⁃centration at the inlet of denitration device to 268 mg/Nm3,the injection amount of ammonia and ammonia escape from the denitration device were greatly reduced.The stable maximum output of the boiler was increased from 345 t/h to 420 t/h,and the annual operating cost was reduced by about 4.88 million yuan.

关 键 词：空气分级燃烧 低NO_(x) 热效率 燃煤锅炉 

分 类 号：X511[环境科学与工程—环境工程]