低氮燃燒器及脫硝改造后機組存在的問題及應對措施-常見問題-黃石市新瑞環?？萍加邢薰?/title> <meta name="Keywords" content="低氮燃氣燃油燃燒器,高爐氣燃燒器,天然氣燃燒器,超低氮燃燒器,直燃式熱風爐,超低氮熱風爐,脫硝熱風爐,低氮沸騰爐,煤粉燃燒器,煤粉爐" > <meta name="Description" content="1 低氮燃燒及脫硝技術低氮燃燒機組主要是針對NOx 的兩種主要生成機理，在降低燃燒溫度的同時，降低著火區域的氧氣濃度。以抑制爐氮氧化物的生成。通過采用爐內低NOx 燃燒技術，能將NOx 排放濃度降低3" > <link href="/Templates/cn/css/style.css" rel="stylesheet"> <link href="/Templates/cn/css/aos.css" rel="stylesheet"> <link href="/Templates/cn/css/style1.css" rel="stylesheet"> <link href="/Templates/cn/css/common.css" rel="stylesheet"> <script src="/Templates/cn/js/jquery.js"></script> <script src="/Templates/cn/js/jquery.superslide.2.1.1.js"></script> <script src="/Templates/cn/js/common.js"></script> <meta http-equiv="Cache-Control" content="no-transform" /> <meta http-equiv="Cache-Control" content="no-siteapp" /> </head> <body> <div style="position:fixed;left:-9000px;top:-9000px;"><acronym id="2000s"></acronym><samp id="2000s"><dl id="2000s"></dl></samp><var id="2000s"><p id="2000s"></p></var><dd 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href="/list/?110_1.html">常見問題</a></div> <h3>常見問題<s></s></h3> </div> <div class="content"> <div class="title">低氮燃燒器及脫硝改造后機組存在的問題及應對措施</div> <div class="mark"><span>發布時間：22-07-11</span><span>瀏覽次數：<i id="hits"><script src="/inc/AspCms_Visits.asp?id=535"></script></i></span></div> <div class="showContxt"> <p align="center"><p>1 低氮燃燒及脫硝技術</p><p><br/></p><p><br/></p><p>低氮燃燒機組主要是針對NOx 的兩種主要生成機理，在降低燃燒溫度的同時，降低著火區域的氧氣濃度。以抑制爐氮氧化物的生成。通過采用爐內低NOx 燃燒技術，能將NOx 排放濃度降低30%～60%。目前普遍采用的低氮燃燒技術主要是通過低氮燃燒器改造，來實現爐內低氧、分級配分的燃燒特性，降低NOx的減排。</p><p><br/></p><p><br/></p><p>由于爐內低氮燃燒技術的局限性,使得NOx的排放不能很好的滿足環保要求，為進一步降低NOx 的排放，必須對燃燒后的煙氣進行脫硝處理。目前通行的煙氣脫硝工藝大致可分為干法、半干法和濕法3 類。其中干法SCR 脫硝工藝以其脫硝裝置結構簡單、運行方便、可靠性高、脫硝效率高、一次投資相對較低等諸多優點，在我國得到了廣泛的商業應用。</p><p><br/></p><p><br/></p><p>SCR 脫硝反應器按照相對于除塵器的安裝位置，可分為高含塵和低含塵兩類。但由于低含塵需要安裝蒸汽加熱器和煙氣換熱器( GGH)，系統復雜，投資大，故一般選擇高含塵工藝。SCR 裝置主要由脫硝反應劑制備系統和反應器本體組成。通過向反應器內噴入脫硝反應劑NH3，將NOx 還原為氮氣和水蒸氣。制氨一般有尿素、液氨、氨水等3 種方法。目前主要采用尿素和液氨兩種制氨方法。脫硝催化劑其材料一般以TiO2 為載體，并摻入V2O5 和WO3 等活性成分。催化劑的活性溫度范圍從300℃～420℃[3]不等。催化劑有蜂窩式和板式兩種。</p><p><br/></p><p><br/></p><p>2、實施NOx減排的機組類型</p><p><br/></p><p><br/></p><p>目前我國電廠在相應國家環保的號召下，NOx排放超標的火電廠均進行了相應的改造，按實施類型可分為四類：1)機組原設計為低氮燃燒方式及煙氣脫硝裝置。此類機組無需進行改造;2)機組原設計低氮燃燒方式并預留安裝脫硝裝置;這種類型機組在設計時，考慮到脫硝裝置的運行要求，在本次改造中，只加裝脫硝裝置;3)機組原設計為低氮燃燒方式，未預留脫硝安裝位置;這種類型機組在設計時，未考慮到脫硝裝置的運行要求，在本次改造中，加裝脫硝裝置，同時進行了相應的輔機改造;4)機組之前未采用低氮燃燒方式，且無脫硝裝置。此類機組在氮氧化物減排改造中，改造幅度大，低氮燃燒器改造以及加裝脫硝裝置。上述幾種進行脫硝改造的機組，同時進行了空預器、除塵器以及引風機的改造。</p><p><br/></p><p><br/></p><p>3、低氮燃燒器及脫硝改造對機組運行的影響</p><p><br/></p><p><br/></p><p>機組經過低氮燃燒器、脫硝系統以及相應輔機改造后，在實際運行NOx排放量均能滿足國家的環保要求，為日后機組的正常運行創造了先決條件，與此同時也給機組帶來一些負面影響。</p><p><br/></p><p><br/></p><p>3.1機組最小技術出力降低，調峰能力差</p><p><br/></p><p><br/></p><p>大部分電廠的脫硝均采用SCR脫硝反應器，催化劑的設計溫度為300℃～420℃。在機組投入脫硝系統運行后，除同步投產脫硝系統的機組外，由于早期鍋爐設計未考慮脫硝系統的運行溫度，多數機組改造后出現了鍋爐低負荷運行時，省煤器出口煙溫無法滿足脫硝系統正常運行溫度的現象，因而鍋爐最小技術出力較改造前均有不同程度的升高，機組的調峰能力下降。針對上述情況，選取山西省具有代表性的九個電廠進行了調研，綜合九個電廠的最小技術出力情況，改造后機組的最小技術出力在50%-77%之間。經加權平均，鍋爐最小技術出力平均為59%，較改造前40%的最低穩燃負荷提高了19%;僅就改造機組來計算鍋爐最小技術出力平均為62% ，鍋爐最小技術出力較改造前提高了22%。其中，原設計低氮燃燒和脫硝系統的機組效果最佳，低氮加脫硝同時改造的機組效果最差。</p><p><br/></p><p><br/></p><p>3.2 AGC調節特性能差</p><p><br/></p><p><br/></p><p>機組在經過低氮燃燒器改造后，爐內的燃燒方式發生了明顯變化，在使用原有協調方式的情況下，機組在投入AGC控制時，主汽壓力偏差大、汽包水位波動;負荷調節速率較快時，由于脫硝噴氨反應存在滯后，容易造成NOx排放指標在短時間內超標，嚴重影響負荷調節速率;同步進行引風機改造的機組，改造后未進行引風機調節特性試驗，在低負荷時，在原有控制方式下，爐膛壓力波動大。</p><p><br/></p><p><br/></p><p>3.3運行經濟性差</p><p><br/></p><p><br/></p><p>完成低氮燃燒器和脫硝改造的機組，大部分存在經濟性降低的現象。主要體現在：</p><p><br/></p><p><br/></p><p>1)飛灰含碳量增大</p><p><br/></p><p><br/></p><p>機組進行低氮燃燒器改造后，由于燃燒方式的改變，如果風粉配比不佳，主燃燒區的缺氧燃燒及燃燼區的低溫燃燒均不利于煤粉的燃盡。另外，改造后機組進行的燃燒調整更多的傾向于降低NOx排放量的調整，導致飛灰含碳量增大，機組經濟性降低。</p><p><br/></p><p><br/></p><p>2)空預器傳熱效果下降，排煙溫度升高</p><p><br/></p><p><br/></p><p>機組脫硝系統投入運行后，脫硝副產物硫酸氫氨在低于露點溫度下，容易在空預器的受熱面上粘結，且極具粘性，流經空預器煙氣中的飛灰容易沉積在空預器受熱面上，致使空預器傳熱效果下降，排煙溫度升高，鍋爐效率降低。</p><p><br/></p><p><br/></p><p>3)再熱汽溫偏低</p><p><br/></p><p><br/></p><p>基于不同的改造情況，部分電廠改造后，再熱汽溫降低5℃～20℃，嚴重影響機組的經濟性。據估算再熱汽溫每降低10℃，影響機組單位煤耗約1g標準煤。</p><p><br/></p><p><br/></p><p>對大多數脫硝改造機組，經濟性均受到一定影響，通過調研，改造后影響機組效率約1%。以單臺600MW機組、負荷率80%、年運行小時數5500小時、標煤單價600元、鍋爐效率降低1%，單位能耗增加約3g標準煤估算，每年多消耗標煤7920噸，折合人民幣475萬元，單位電量成本增加0.18分。</p><p><br/></p><script 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