湖南工业大学学报
湖南工業大學學報
호남공업대학학보
JOURNAL OF HUNAN UNIVERSITY OF TECHNOLOGY
2015年
2期
1-7
,共7页
王汉青%易检长%李端茹%李灿%寇广孝%刘畅荣%叶明强%李军%刘华
王漢青%易檢長%李耑茹%李燦%寇廣孝%劉暢榮%葉明彊%李軍%劉華
왕한청%역검장%리단여%리찬%구엄효%류창영%협명강%리군%류화
脱硝%仿真模拟%导流板%选择性催化还原法
脫硝%倣真模擬%導流闆%選擇性催化還原法
탈초%방진모의%도류판%선택성최화환원법
denitration%numerical simulation%guide plate%SCR
根据某电厂SCR脱硝装置气流均匀性的设计要求,按1:1比例建立三维模型,划分网格后进行CFD仿真模拟,并根据模拟结果对比分析了速度相对标准偏差、最大烟气入射角度、温度最大绝对偏差、氨氮物质的量之比、系统压损5个参数,研究了关键位置导流板的优化设置规律。结果表明,在整个SCR脱硝装置烟道系统中,烟道入口处宜设置等间距导流板,以使气流均匀进入后部管道;烟道系统中任何有变径或变向的烟道均宜设置导流板,以防止气流偏向某一方;距离反应器最近处的烟道外形、导流板尺寸对气流均匀性影响最大;在反应器顶部加设干扰气流的小圆管,对改善局部区域气流均匀性有一定作用。
根據某電廠SCR脫硝裝置氣流均勻性的設計要求,按1:1比例建立三維模型,劃分網格後進行CFD倣真模擬,併根據模擬結果對比分析瞭速度相對標準偏差、最大煙氣入射角度、溫度最大絕對偏差、氨氮物質的量之比、繫統壓損5箇參數,研究瞭關鍵位置導流闆的優化設置規律。結果錶明,在整箇SCR脫硝裝置煙道繫統中,煙道入口處宜設置等間距導流闆,以使氣流均勻進入後部管道;煙道繫統中任何有變徑或變嚮的煙道均宜設置導流闆,以防止氣流偏嚮某一方;距離反應器最近處的煙道外形、導流闆呎吋對氣流均勻性影響最大;在反應器頂部加設榦擾氣流的小圓管,對改善跼部區域氣流均勻性有一定作用。
근거모전엄SCR탈초장치기류균균성적설계요구,안1:1비례건립삼유모형,화분망격후진행CFD방진모의,병근거모의결과대비분석료속도상대표준편차、최대연기입사각도、온도최대절대편차、안담물질적량지비、계통압손5개삼수,연구료관건위치도류판적우화설치규률。결과표명,재정개SCR탈초장치연도계통중,연도입구처의설치등간거도류판,이사기류균균진입후부관도;연도계통중임하유변경혹변향적연도균의설치도류판,이방지기류편향모일방;거리반응기최근처적연도외형、도류판척촌대기류균균성영향최대;재반응기정부가설간우기류적소원관,대개선국부구역기류균균성유일정작용。
According to the design requirement of airflow uniformity of SCR denitration device in a power plant, established a three-dimensional model with a ratio of 1:1 and simulatedwith CFD after meshing. On the basis of the simula-tion result, contrasted and analyzed five parameters of speed relative standard deviation, the max flue gas incident angle, the temperaturemaximum absolute deviation, the molar ratio of NH3/NO and the systempressure loss, and investigated the guide plate optimal setting rule in the key positions. The results showed that in the SCR denitration system, it is necessary to set the equidistant guide plate at the flue entrance for uniform airflow into rear pipe, and the guide plates should also be set at the appropriate positions with reducing and changing direction to prevent the gas flow to one side. The guide plate size and the flue pipe shape nearest to the reactor have the most impact on the airflow uniformity. Installing the little pipe on the reactor top would improve local position air uniformity.