燃煤流化床钙基脱硫剂对NO转变率的影响及机理  

Influence and Mechanism of Calcium-based Desulfurizer on NO Conversion in Fluidized Bed of Coal

作　　者：张东平[1] 池涌[1] 严建华[1] 李香排[1] 曹玉春[1] 岑可法[1] 

机构地区：[1]浙江大学热能工程研究所能源洁净利用与环境工程教育部重点试验室,杭州310027

出　　处：《环境科学》2003年第1期143-146,共4页Environmental Science

基　　金：国家自然科学基金资助项目 ( 5 983 62 10 );浙江省青年科技人才专项资金项目 (RC990 41)

摘　　要：在1 5 0mm× 1 0 0 0mm流化床试验台上 ,温度区间 84 0℃～ 960℃ ,研究了钙基脱硫剂品种、粒径和Ca/S比对NO转变率的影响 .阐述了钙基脱硫剂使NO转变率增加机理 .试验发现 ,同等质量钙基脱硫剂使NO增加的次序为氧化钙、石灰石、方解石 ;Ca/S比越大 ,NO转变率越高 ;粒径为 1～ 2mm时NO转变率最大 ,2～ 3mm时次之 ,0 2～ 1mm时最小 .加入脱硫剂降低了HCl、HF、SO2 的浓度 ,导致O、H、HO2 浓度升高 ,CO的氧化反应加速 ,在床料、燃料灰催化作用下CO与NO的反应减慢 。On the experimental table of fluidized bed which scale was  150mm×1000mm and temperature interval was from 840℃ to 960℃,the influence of desulfurizer variety,particle size and molar ratios Ca/S on nitrogen conversion to NO were studied.This paper elaborated on the mechanism of calcium-based desulfurizer lead to the increase of NO conversion rate.Experiment presented that given identical quantities,burnt calcium had maximum NO conversion rate,then limestone,calcite last.Nitrogen conversion to NO increased with increasing molar ratios Ca/S.When the particle size was between 1～2mm,the NO conversion rate was the maximum,second was 2～3mm,the last 0.2～1mm.HCl,HF,SO 2 decreased with calcium addition.At the same time H,OH,HO 2 radicals increased.The CO oxidation was favored,the reaction of monoxide and NO catalyzed by char,sand,ash will weaken,therefore NO content will increase.

关 键 词：燃煤流化床 钙基脱硫剂 NO 转变率 转变机理 一氧化氮 废气处理 

分 类 号：X701.3[环境科学与工程—环境工程]