本文關鍵詞：上海石化循環(huán)流化床鍋爐脫銷系統(tǒng)改造的設計與實施　出處：《華東理工大學》2016年碩士論文　論文類型：學位論文

  更多相關文章： 脫硝系統(tǒng) 減排 SNCR 氮氧化物

【摘要】：中國石化上海石油化工股份有限公司(以下簡稱“上海石化”),位于上海市金山區(qū)金山衛(wèi),占地面積9.4平方公里,是目前中國規(guī)模最大的煉油化工一體化、高度綜合的現(xiàn)代化石油化工企業(yè)之一,是中國發(fā)展現(xiàn)代石化工業(yè)的重要基地,同時也是國家環(huán)保重點監(jiān)控單位,由于其處于滬浙省地交界處,故而其環(huán)境影響面,較其他區(qū)域更為重大。上海石化其下屬單位熱電部7#爐為1臺620t/h循環(huán)流化床(CFB)鍋爐,是由上海鍋爐廠設計制造的自然循環(huán)汽包爐,其煙氣污染排放亦受國家環(huán)保定點實時監(jiān)控。該爐煙氣量為590000NM3/h(干基、6%O2),NOx初始排放濃度250mg/Nm3(以N02計、干基、6%02)。然而,根據(jù)《火電廠大氣污染物排放標準》(GB 13223-2011)規(guī)定：自2014年7月1日起,現(xiàn)有循環(huán)流化床火力發(fā)電鍋爐NOx排放限值為100mg/Nm3(重點地區(qū))。7#爐的NOx排放濃度超出了國家100mg/Nm3的NOx排放標準,面臨著煙氣脫硝的壓力,為應對日益嚴格的環(huán)保要求和企業(yè)發(fā)展需求,需要對該鍋爐進行煙氣脫硝治理,確保鍋爐排放煙氣中氮氧化物達標排放。本文對上海石化7#國產(chǎn)620t·h-1循環(huán)流化床鍋爐效率及NOx排放濃度不能達到性能保證值的現(xiàn)狀,分析了鍋爐的熱損失情況以及NOx排放濃度與平均床溫等參數(shù)間的規(guī)律,得出排煙熱損失及固體未完全燃燒熱損失過大、平均床溫偏高、因風帽磨損引起的流化質量下降是造成鍋爐效率及NOx排放濃度超性能保證值的主要原因。在此基礎上對鍋爐回轉式空預器改造、加長水冷屏和屏式過熱器以及風帽改型等實施了爐內燃燒脫硝技術的具體改造。然而,由于國家環(huán)保越來越嚴格的排放總量控制目標的下達,上海石化在之前改造的基礎上進一步加大脫硝技術工藝的投入和研究,在爐內燃燒脫硝技術工藝的基礎之上,增加鍋爐尾部煙氣脫硝工藝的改造,使用了當前較為先進的選擇性非催化還原(SNCR)脫硝技術,通過對此項技術在上海石化7#鍋爐上的設計、模擬和實施對比的研究,得出了SNCR脫硝技術的在循環(huán)流化床鍋爐上使用的適應性和局限性結論。上海石化熱電部循環(huán)流化床鍋爐通過針對脫硝系統(tǒng)的改造,在此前鍋爐提效改造的基礎上,進一步提升了對鍋爐NOx排放的控制水平。
[Abstract]:Sinopec of Shanghai petroleum chemical Limited by Share Ltd (hereinafter referred to as the "Shanghai petrochemical"), located in Shanghai City, Jinshan District Jinshanwei, covers an area of 9.4 square kilometers, is currently one of the largest oil refining chemical integration, China highly integrated modern petrochemical enterprises, is an important base for the development of modern Chinese petrochemical industry, but also the national key environmental protection monitoring units. It is at the junction of Shanghai and Zhejiang Province, due to its environmental impact, is more important than other regions. Shanghai Petrochemical Company's subordinate thermal power unit 7# furnace is 1 620t/h circulating fluidized bed (CFB) boiler. It is a natural circulation drum boiler designed and manufactured by Shanghai boiler plant. Its flue gas pollution discharge is also monitored by the national environmental protection fixed-point in real time. The flue gas amount of the furnace is 590000NM3/h (dry base, 6%O2), and the initial emission concentration of NOx is 250mg/Nm3 (N02, dry base, 6%02). However, according to the "discharge standard for air pollutants in thermal power plants" (GB 13223-2011): since July 1, 2014, the NOx emission limits of the existing circulating fluidized bed thermal power boilers are 100mg/Nm3 (key areas). The concentration of NOx emission of 7# furnace exceeded national 100mg/Nm3 emission standard of NOx, facing the pressure of flue gas denitrification, as the increasingly stringent environmental requirements and respond to the needs of enterprise development, the need for the boiler flue gas denitration governance, ensure that emissions of nitrogen oxides in boiler flue gas discharge standards. In this paper, Shanghai petrochemical 7# domestic 620t H-1 circulating fluidized bed boiler efficiency and NOx emission concentration can not reach the performance value of the current guarantee, analyzed the heat loss of the boiler and the NOx emission concentration and average bed temperature and other parameters of the law, the heat loss of exhaust gas and solid incomplete combustion heat loss is too large, the average bed temperature is high because hood wear down the fluidization quality caused by boiler efficiency and NOx emission performance guarantee value of the main reasons. On the basis of the boiler rotary air preheater cold water transformation, lengthened screen and the screen type superheater and hood modification implemented specific transformation denitration technology of combustion furnace. However, due to the increasingly stringent national environmental protection objectives of the total emission control issued denitration technology and research investment to further increase the foundation of Shanghai Petrochemical before transformation, combustion in furnace based on denitration technology transformation, increase the denitration process of flue gas boiler, using the current advanced selectivity non catalytic reduction denitration technology (SNCR), through the design, this technology in Shanghai petrochemical 7# boiler simulation and contrast research, the adaptability and limitation of the conclusion of the CFB boiler SNCR denitration technology. The circulating fluidized bed boiler of Shanghai Petrochemical thermoelectric ministry has improved the control level of NOx emission of boiler by improving the denitration system.
【學位授予單位】：華東理工大學
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：TK229.66

【參考文獻】

相關期刊論文 前10條

1 喬建軍;王澤璞;陳江濤;任曉辰;;基于雙尺度低NO_x燃燒技術的電站鍋爐改造[J];河北工業(yè)科技;2015年03期

2 楊凱元;付喜亮;趙建軍;;600MW機組鍋爐低氮燃燒技術改造[J];內蒙古電力技術;2015年02期

3 刁利;李光;吳思竹;;基于燃煤清潔技術的脫硝技改工程投資估算及財務分析[J];電網(wǎng)與清潔能源;2014年07期

4 李紅智;姚明宇;徐黨旗;聶建平;;褐煤鍋爐SCR入口煙溫高和制粉干燥出力不足問題分析及改造[J];熱力發(fā)電;2014年06期

5 禾志強;武斌;馬松玲;李浩杰;;SCR煙氣脫硝催化劑活性在線測試方法[J];內蒙古電力技術;2014年02期

6 金理鵬;王勇;宋玉寶;牛國平;趙俊武;楊恂;;煙氣參數(shù)對選擇性催化還原系統(tǒng)設計的影響分析[J];熱力發(fā)電;2013年08期

7 孫華芳;楊世極;;某2×210MW機組鍋爐脫硝系統(tǒng)改造[J];熱力發(fā)電;2013年07期

8 陳偉;葉春;;遺傳算法在電廠NO_x減排中的應用[J];能源與節(jié)能;2013年07期

9 趙曉軍;張寶紅;易智勇;孫記;;雙尺度低氮燃燒技術在錦州熱電廠的應用[J];熱力發(fā)電;2013年06期

10 王敦坤;盧彬;張立鵬;楊金鳳;;S7-300軟冗余系統(tǒng)在鍋爐FSSS中的應用[J];電子設計工程;2011年01期

相關碩士學位論文 前1條

1 路濤;四角切圓燃燒鍋爐中SNCR過程的數(shù)值模擬[D];華北電力大學（北京）;2004年

，

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