中国电机工程学报
中國電機工程學報
중국전궤공정학보
Proceedings of the CSEE
2015年
20期
5265-5271,后插13
,共8页
陈天杰%姚露%刘建民%黄启龙%陈国庆%金保昇%张勇
陳天傑%姚露%劉建民%黃啟龍%陳國慶%金保昇%張勇
진천걸%요로%류건민%황계룡%진국경%금보승%장용
前后墙对冲燃煤锅炉%高温腐蚀%贴壁风布置方案%数值模拟
前後牆對遲燃煤鍋爐%高溫腐蝕%貼壁風佈置方案%數值模擬
전후장대충연매과로%고온부식%첩벽풍포치방안%수치모의
front and rear wall opposed coal-fired boiler%high temperature corrosion%closing-to-wall air layout%numerical simulation
针对某电厂660 MW前后墙对冲燃煤锅炉侧墙水冷壁出现的高温腐蚀问题,提出了前后墙开孔(方案 1)、侧墙开槽(方案2)以及二者组合(方案3)等3种贴壁风布置方案,并对各方案的防腐蚀效果进行了数值模拟分析.结果表明:方案1需要较多贴壁风来保证喷口射流刚性,以使O2扩散到侧墙中部的高温腐蚀区;方案2使用较少贴壁风便可在沿炉深方向的喷口附近区域取得良好的补氧效果,但贴壁风沿炉高方向的扩散范围有限,导致相当部分的高温腐蚀区无法获得O2补充;方案3吸收了前2类方案优点,其最优方案C仅用 4.35%风率即使侧墙水冷壁高温腐蚀区域 O2浓度基本达到 2%(破坏还原性气氛所需浓度)以上,从而有效地解决了高温腐蚀问题.
針對某電廠660 MW前後牆對遲燃煤鍋爐側牆水冷壁齣現的高溫腐蝕問題,提齣瞭前後牆開孔(方案 1)、側牆開槽(方案2)以及二者組閤(方案3)等3種貼壁風佈置方案,併對各方案的防腐蝕效果進行瞭數值模擬分析.結果錶明:方案1需要較多貼壁風來保證噴口射流剛性,以使O2擴散到側牆中部的高溫腐蝕區;方案2使用較少貼壁風便可在沿爐深方嚮的噴口附近區域取得良好的補氧效果,但貼壁風沿爐高方嚮的擴散範圍有限,導緻相噹部分的高溫腐蝕區無法穫得O2補充;方案3吸收瞭前2類方案優點,其最優方案C僅用 4.35%風率即使側牆水冷壁高溫腐蝕區域 O2濃度基本達到 2%(破壞還原性氣氛所需濃度)以上,從而有效地解決瞭高溫腐蝕問題.
침대모전엄660 MW전후장대충연매과로측장수랭벽출현적고온부식문제,제출료전후장개공(방안 1)、측장개조(방안2)이급이자조합(방안3)등3충첩벽풍포치방안,병대각방안적방부식효과진행료수치모의분석.결과표명:방안1수요교다첩벽풍래보증분구사류강성,이사O2확산도측장중부적고온부식구;방안2사용교소첩벽풍편가재연로심방향적분구부근구역취득량호적보양효과,단첩벽풍연로고방향적확산범위유한,도치상당부분적고온부식구무법획득O2보충;방안3흡수료전2류방안우점,기최우방안C부용 4.35%풍솔즉사측장수랭벽고온부식구역 O2농도기본체도 2%(파배환원성기분소수농도)이상,종이유효지해결료고온부식문제.
In order to deal with the high temperature corrosion of the water-cooled wall of a 660MW front and rear wall opposed coal-fired boiler, three cases were presented, including Scheme 1 with the wind in the front and rear walls, Scheme 2 with the wind in the side walls and Scheme 3 with the wind both in the front/rear and side walls. Then, the flow and combustion characteristic of different cases were simulated. The results show that in the Scheme 1, lots of closing-to-wall air is needed to ensure the rigidity of the jet, so that O2 diffused into the high temperature corrosion zone located in the middle of the side walls. In the Scheme 2, O2 could cover the water-cooled wall nearby the nozzles only when the jet with low velocity is introduced into the furnace. However, it is difficult for O2 to cover the upper part of the water-cooled wall. In the Scheme 3 which took advantage of Scheme 1 and 2, only closing-to-wall air with the air volume rate of 4.35% could ensure that O2 concentration of the most region of the water-cooled wall exceeded 2%,which solved the high temperature corrosion problem effectively.