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align="center"><p>它們是一個(gè)概念。</p><p>　　煤粉鍋爐，提高了煤的燃燒速率，高效節能，起停簡(jiǎn)單。由爐膛，燃燒器，點(diǎn)火裝置等構成。</p><p>　　煤粉鍋爐的燃燒沒(méi)備由燃燒室(爐膛)、燃燒器和點(diǎn)火裝置組成。</p><p>　　一、爐膛</p><p>　　煤粉鍋爐的爐膛是燃料燃燒的場(chǎng)所。它的四周布滿(mǎn)了蒸發(fā)受熱面(水冷壁)，有時(shí)也設有墻式陣熱器，爐膛也是熱交換的場(chǎng)所是鍋爐最重要的部件之一。煤粉鍋爐的爐膛既要保證燃料的完全燃燒、又要合理組織爐內換熱、布置適當的受熱面以滿(mǎn)足鍋爐容量的要求井使煙氣到達爐膛出口時(shí)被冷卻到使其后的對流受熱面不結渣和安全工作所允許的溫度。</p><p>　　爐膛的結構應當滿(mǎn)足下列要求:</p><p>　　1、一合理布置燃燒器，使燃料迅速著(zhù)火:有良好的爐內空氣動(dòng)力場(chǎng)使各壁面的熱負荷均勻；既要使火焰在爐膛的充滿(mǎn)度好、減少氣流的死滯區。又要避免火焰沖墻、避免結渣。</p><p>　　2、爐膛要有足夠的容積和高度以保證燃料在爐內的停留時(shí)間并完全燃燒。</p><p>　　3、能夠布置適當的蒸發(fā)受熱面滿(mǎn)足鍋爐容量的要求:爐膛出口煙氣溫度適當以確保護膛出日及以后受熱面不結渣和安全工作。</p><p>　　4、爐膛結構緊湊，金屬及其他材料用量少；便于制造、安裝、操作和維護。</p><p>　　二、燃燒器</p><p>　　燃燒器是煤粉鍋爐的主要燃燒設備。其作用是保證燃料和燃燒用空氣在進(jìn)入爐膛時(shí)能充分混一合。及時(shí)著(zhù)火和穩定燃燒。通過(guò)燃燒器送入鍋爐的空氣是按對著(zhù)火、燃燒有利的原則合理組織、分別送入的。按照送入空氣作用的不同可以將送入的空氣分為一次風(fēng)、二次風(fēng)和三次風(fēng)。一次風(fēng)是攜帶煤粉送入燃燒器的空氣，二次風(fēng)是煤粉著(zhù)火后再送入的空氣，三次風(fēng)是采用熱風(fēng)送粉時(shí)制粉系統的乏氣。</p><p>　　對鍋爐燃燒器的要求主要有:</p><p>　　1、保證送入爐內的煤粉氣流能迅速、穩定地著(zhù)火燃燒</p><p>　　2、供應合理的二次風(fēng)，使它與一次風(fēng)能及時(shí)良好地混合確保較高的燃燒效率；</p><p>　　3、火焰在爐膛內的充滿(mǎn)度較好，且不會(huì )沖墻貼壁避免結渣；</p><p>　　4、較好的燃燒適用性和負荷調節范圍；</p><p>　　5、流動(dòng)阻力較小，污染物生成量少。</p><p>　　三、點(diǎn)火裝置</p><p>　　煤粉鍋爐點(diǎn)火裝置的用途，主要是在鍋爐啟動(dòng)時(shí)用來(lái)點(diǎn)燃主燃燒器的煤粉氣流。另外，當鍋爐機組需要在較低負荷下運行時(shí)或一者當燃煤質(zhì)量差、爐火溫度降低危及煤粉氣流著(zhù)火的穩定，爐內火焰發(fā)生脈動(dòng)以至有熄火危險時(shí)也用點(diǎn)火裝置來(lái)穩定著(zhù)火和燃燒；同時(shí)也可以作為輔助燃燒的一種手段。</p><p>　　現代煤粉鍋爐通常采用過(guò)渡燃料的點(diǎn)火裝置可以分為氣—油—煤粉的三級點(diǎn)火系統和油—煤粉的二級點(diǎn)火系統兩種。三級點(diǎn)火系統是用點(diǎn)火器點(diǎn)燃著(zhù)火能量最小的氣體燃料開(kāi)始，再點(diǎn)燃霧化的燃料油，最后點(diǎn)燃主燃燒器的煤粉氣流。二級點(diǎn)火系統則用點(diǎn)火器點(diǎn)燃燃料油。再點(diǎn)燃主燃燒器中的煤粉氣流。</p><p>　　點(diǎn)火裝置中的點(diǎn)火器都采用電氣點(diǎn)火器，常用的有電火花點(diǎn)火器、電弧點(diǎn)火器和高能點(diǎn)火器三種。</p><p>　　四，運行狀況</p><p>　　首先，鍋爐系統立體化、智能化，基本靠電腦程序自控運行，可以實(shí)現集中遠程控制，終端供熱站點(diǎn)幾乎不需要值守人員。</p><p>　　和老鍋爐相比，儲煤儲灰系統都是自動(dòng)運行塔式結構，全封閉，無(wú)污染。另外，新鍋爐爐體體積小于傳統鍋爐，但性能是原先的兩倍。通過(guò)改造的燃燒器，首次點(diǎn)火經(jīng)歷電-氣-油-粉四個(gè)過(guò)程，之后由電控制煤粉燃燒。整個(gè)過(guò)程只需要2個(gè)人通過(guò)電腦操作，15秒鐘即可完成鍋爐點(diǎn)火過(guò)程。</p><p>　　至于燃料運輸，現有的煤粉塔可以?xún)Υ?天的用量，一般每天一到兩車(chē)就夠了。而產(chǎn)生的煤灰，半個(gè)月拉一次。且這是一種極好的高檔瓷磚原料，在南方一噸能賣(mài)到300-400元。這不僅是節能的表現，另一方面，也節約了不少生產(chǎn)成本。</p><p><br/></p></p> 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