CAJ | 학술논문

在循环流化床试验装置上考察尾部烟道喷射凹凸棒土悬浊液情况下燃煤细颗粒物(PM2.5)排放规律。具体为在燃烧温度为900℃，入炉煤粒径为0.6~1.5mm 的条件下，考察悬浊液流量、雾化空气与团聚剂悬浊液的质量比以及凹凸棒添加量等对PM2.5的排放特性影响，同时对细颗粒物的微观形貌及元素组成进行分析。结果表明，喷射凹凸棒土可以有效降低煤燃烧PM2.5的排放量。随着悬浊液流量和凹凸棒土添加量的增加，PM2.5数量密度和质量浓度均降低，颗粒粒径有从亚微米向超微米转移的趋势。增大雾化空气与团聚剂悬浊液的质量比有利于颗粒物团聚，也使得尾部烟气中PM2.5数量大幅减少。从 PM2.5的粒径分布、形貌分析和元素迁移规律可知，凹凸棒土促进了颗粒物团聚捕集，从而有利于减少PM2.5的排放，实现对其有效控制。
재순배류화상시험장치상고찰미부연도분사요철봉토현탁액정황하연매세과립물(PM2.5)배방규률。구체위재연소온도위900℃，입로매립경위0.6~1.5mm 적조건하，고찰현탁액류량、무화공기여단취제현탁액적질량비이급요철봉첨가량등대PM2.5적배방특성영향，동시대세과립물적미관형모급원소조성진행분석。결과표명，분사요철봉토가이유효강저매연소PM2.5적배방량。수착현탁액류량화요철봉토첨가량적증가，PM2.5수량밀도화질량농도균강저，과립립경유종아미미향초미미전이적추세。증대무화공기여단취제현탁액적질량비유리우과립물단취，야사득미부연기중PM2.5수량대폭감소。종 PM2.5적립경분포、형모분석화원소천이규률가지，요철봉토촉진료과립물단취포집，종이유리우감소PM2.5적배방，실현대기유효공제。
Fine particles (PM2.5) emission behavior was investigated in a circulating fluidized bed (CFB) with attapulgite suspensions spraying into the flue gas. The effects of flow rate of attapulgite suspensions, gas-liquid ratio and attapulgite mass fraction on PM2.5emission were studied in a CFB where coal of 0.6-1.5mm was combusted at a temperature of 900oC. Morphology analysis andelement migration features of the collected particle samples were analyzed. The results show that spraying attapulgite suspensions into flue gas can effectively reduce PM2.5emission. Both the PM2.5 number density and mass density decrease with the increase in flow rate of attapulgite suspensions and mass fraction of attapulgite in the suspensions. A trend of shift in particle size can be observed from submicron particles to supermicron ones. Increasing gas-liquid ratio was in favor of particle aggregation leading to decrease in PM2.5 emission. Based on PM2.5 particle size distribution, morphology analysis andelement migration features, a conclusion can be drawn that spraying attapulgite suspensions helps to promote particle aggregation and effectively reduce PM2.5emission during coal combustion in CFB.