SCR脱硝低负荷投运烟气调温旁路改造设计

SCR脱硝低负荷投运烟气调温旁路改造设计摘要：燃煤电厂低负荷运行时SCR脱硝装置入口烟温常达不到要求，某些电厂采纳旁路提温方法予以解决，却消失调温旁路提温效果欠佳和烟温偏差较大的问题。以A电厂某330MW机组为例，在现场勘察基础上采纳数值模拟方法，找出问题所在：（1）旁路烟道结构不合理，未考虑原烟道结构缺陷；（2）旁路烟道未设置导流元件；（3）旁路接入位置不合理；（4）旁路接入烟道深度不足。在总结脱硝调温旁路烟道设计和运行要点基础上，采纳数值模拟手段对B电厂某330MW机组类似改造进行了优化设计，并开呈现场试验，对烟气提温效果进行评估。结果表明：B电厂烟气旁路提温改造效果显著且烟温偏差较小。<imgsrc=“/UploadFiles/2020001/20209/Env/202009121754508409.jpg”alt=““width=“586”height=“485”/<imgsrc=“/UploadFiles/2020001/20209/Env/202009121754511279.jpg”alt=““width=“375”height=“561”/<imgsrc=“/UploadFiles/2020001/20209/Env/202009121754516187.jpg”alt=““width=“303”height=“491”/<imgsrc=“/UploadFiles/2020001/20209/Env/202009121754519048.jpg”alt=““width=“305”height=“512”/<imgsrc=“/UploadFiles/2020001/20209/Env/202009121754519947.jpg”alt=““width=“291”height=“274”/<imgsrc=“/UploadFiles/2020001/20209/Env/202009121754514816.jpg”alt=““width=“308”height=“397”/<imgsrc=“/UploadFiles/2020001/20209/Env/202009121754516955.jpg”alt=““width=“296”height=“392”/<imgsrc=“/UploadFiles/2020001/20209/Env/202009121754520174.jpg”alt=““width=“306”height=“451”/<imgsrc=“/UploadFiles/2020001/20209/Env/202009121754525595.jpg”alt=““width=“280”height=“333”/<imgsrc=“/UploadFiles/2020001/20209/Env/202009121754522333.jpg”alt=““width=“299”height=“530”/<imgsrc=“/UploadFiles/2020001/20209/Env/202009121754527289.jpg”alt=““width=“288”height=“251”/<imgsrc=“/UploadFiles/2020001/20209/Env/202009121754521978.jpg”alt=““width=“301”height=“414”/<imgsrc=“/UploadFi