200829833 九、發明說明 【發明所屬之技術領域】 本發明係關於使用難燃性燃料之微粉碳燃燒鍋爐等的 各種燃燒裝置所適用之難燃性燃料用燃燒器。 【先前技術】 以往，在使用細粉末狀的難燃性燃料（例如無煙碳、 石油焦寺）之微粉碳燃燒鍋爐中’係採用燃燒粉末狀的難 燃性燃料之難燃性燃料用燃燒器（以下稱「燃燒器」）。 例如像第4圖及第5圖所示，以微粉碳（細粉末狀的 無煙碳）爲燃料而在鍋爐的火爐1內進行燃燒之習知燃燒 器1 〇 A，係具備：位於燃燒器中心部，流過微粉碳及一次 空氣的混合流體之約1 00°c的微粉碳混合氣系統、位於其 外周部，流過約3 00〜3 5 0 °c的二次空氣之二次空氣系統。 一次空氣系統，爲了提昇著火性而具備設置於燃燒器 部的上游之分離器20A。該分離器20A，係利用旋風分離 的原理，可將燃料粒子分離成濃部位（濃部）和淡部位（ 淡部）。 一次空氣系統之分離器的下游側係分支成··導入高粒 子濃度氣體（燃料粒子的濃度高）而使其燃燒之濃部噴嘴 24、導入低粒子濃度氣體（燃料粒子的濃度低）而使其燃 燒之淡部噴嘴2 6。在使用難燃性燃料的情形，爲了提昇著 火性，一般是將燃燒器1 0 A全體設置成向下傾斜。 關於淡部噴嘴26，係設置於形成火爐1的火爐壁2側 •5- 200829833 ，藉此形成氧化環境氣氛以防止結塊（slugging)。 圖中之符號23，係將高粒子濃度氣體從分離器20A 導至濃部噴嘴24之高粒子濃度氣體配管；圖中之符號25 ，係將低粒子濃度氣體從分離器20A導至淡部噴嘴26之 低粒子濃度氣體配管（例如參照日本特開平8-178210號 公報（第5圖））。 然而’依據上述習知技術，當隨著鍋爐負載等改變而 φ 造成氣體量改變時，可能會影響導火性、穩定燃燒。此外 ，在使用難燃性燃料的情形，特別是相鄰噴嘴間之火焰發 . 生干涉時，也會影響導火性和穩定燃燒。 • 具體而言’燃料粒子之濃淡分布效率係依據分離器 20A的效率來決定。因此，當氣體供應量降低之局部負載 時，由於離心力降低而造成分離器2 Ο A的分離效率變差， 因此要使濃度噴嘴24及淡度噴嘴26獲得期望的濃淡分布 率會有困難。 φ 此外’在部分負載或預備燃燒器等之未使用燃燒器的 情形，基於負壓可能會產生從淡部噴嘴配管25朝分離器 20A方向之氣體逆流。 【發明內容】 上述濃淡分布率之變動、氣體逆流、以及相鄰噴嘴間 之火焰干涉，會對難燃性燃料用燃燒器1 0 A (利用分離器 20A來分配難燃性燃料的燃料粒子）之著火性及穩定燃燒 造成影響，因此期望開發出能解決該問題之難燃性燃料用 -6 - 200829833 燃燒器。 本發明係有鑑於上述事情而構成者，其目的係提供一 種即使隨著鍋爐負載等的改變而造成氣體量改變，仍能確 保良好的著火性和穩定燃燒之難燃性燃料用燃燒器。 本發明之難燃性燃料用燃燒器，係將和空氣一起供應 之粉末狀的難燃性燃料用分離器分離後，分配至配設於火 爐內之濃部噴嘴及淡部噴嘴而進行燃燒之難燃性燃料用燃 燒器，其特徵在於··在從前述分離器的下游連通至前述濃 部噴嘴及前述淡部噴嘴之氣體流路內的至少一方，係設有 流路截面積之可變控制手段。 依據本發明之難燃性燃料用燃燒器，係在從前述分離 器的下游連通至前述濃部噴嘴及前述淡部噴嘴之氣體流路 內的至少一方，設有流路截面積之可變控制手段，因此藉 由適當改變氣體流路之流路截面積，即可按照部分負載等 的運轉狀況而調整成最佳値。 如此般之難燃性燃料用燃燒器較佳爲，前述可變控制 手段，係設於從前述分離器朝前述濃部噴嘴供應高粒子濃 度氣體之氣體流路內之可動式阻抗體。藉此，能使朝濃部 噴嘴供應高粒子濃度氣體之氣體流路的流路截面積適當地 改變。因此，能按照運轉狀況來調整供應高粒子濃度氣體 之氣體流路內的氣體流量，以使分離器之分離效率能按照 部分負載等的運轉狀況而形成最佳化。 如此般之難燃性燃料用燃燒器較佳爲，前述可變控制 手段，係設於從前述分離器朝前述淡部噴嘴供應低粒子濃 -7- 200829833 度氣體之氣體流路內之流量調整遮斷閥。藉此，能使朝淡 部噴嘴供應低粒子濃度氣體之氣體流路的截面積在全開至 全閉之間適當地改變。因此，能按照運轉狀況來調整供應 低粒子濃度氣體之氣體流路內的氣體流量，或在不使用燃 燒器時能遮斷氣體流路。 如此般之難燃性燃料用燃燒器較佳爲，在供應至前述 分離器內之難燃性燃料所衝撞的壁面實施耐磨耗處理，藉 此，可提昇難燃性燃料所衝撞的壁面之耐磨耗性。 本發明之難燃性燃料用燃燒器，係將和空氣一起供應 之粉末狀的難燃性燃料用分離器分離後，分配至配設於火 爐內之濃部噴嘴及淡部噴嘴而進行燃燒之難燃性燃料用燃 燒器，其特徵在於：將前述濃部噴嘴和前述淡部噴嘴之噴 吹角度在上下方向偏移。 藉由使用如此般之難燃性燃料用燃燒器，由於將濃部 噴嘴和淡部噴嘴之噴吹角度在上下方向偏移，故可防止噴 嘴間之火焰干涉。 本發明之難燃性燃料用燃燒器，係將和空氣一起供應 之粉末狀的難燃性燃料用分離器分離後，分配至配設於火 爐內之濃部噴嘴及淡部噴嘴而進行燃燒之難燃性燃料用燃 燒器，其特徵在於：使前述淡部噴嘴之噴吹角度朝水平方 向之爐壁側偏移。 藉由使用如此般之難燃性燃料用燃燒器’由於前述淡 部噴嘴之噴吹角度朝水平方向之爐壁側偏移，故可防止噴 嘴間之火焰干涉，且能防止火爐壁面之結塊。 -8- 200829833 依據上述之本發明’在藉由分離器來分配 的燃料粒子之難燃性燃料用燃燒器，可防止按 之濃淡分布率的變動及氣體逆流，因此能確保 性及穩定燃燒。 另外，藉由防止相鄰噴嘴間之火焰干涉， 好的著火性及穩定燃燒。 Φ 【實施方式】 以下，參照圖式來說明本發明的難燃性燃 之一實施形態。 第1圖至第3圖所示之難燃性燃料用燃燒 「燃燒器」）1 0，例如是設置於微粉碳燃燒鍋 1內。該燃燒器10，係將和空氣一起供應之難 粉粒體（微細粉末狀）在火爐1內燃燒。在此 料之具體例係包含無煙碳和石油焦等。 # 以下係說明：將難燃性燃料的無煙碳變成 (微粉碳燃料）予以供應並使其燃燒之燃燒器 燃燒器1 0係具備：將約1 00 °c之較低溫的 微粉碳一起供應之微粉碳供應系統、將約3 00〜 高溫的二次空氣予以供應之二次空氣系統。 微粉碳供應系統，係大致位於燃燒器1 0 且基於提昇著火性的目的而具備：用來將一次 碳的混合流體分配至後述的濃部及淡部之分離ί 離器20 ’係利用離心分離之旋風分離器，在外 難燃性燃料 照運轉狀況 良好的著火 也能確保良 料用燃燒器 器（以下稱 爐等的火爐 燃性燃料的 ，難燃性燃 微細粉末狀 10° 一次空氣和 -3 5 0 °c之較 的中心部， 空氣及微粉 器20 。該分 筒2 1的側 -9- 200829833 面，連接著從切線方向供應混合流體之一次空氣配管22 ° 在將外筒21縮徑成圓錐台狀的細徑部2 1 a ’連接著高粒子 濃度氣體配管23，在其前端部設有朝向火爐1內開口之濃 部噴嘴24。 在外筒2 1的內部，以同心的方式插入低粒子濃度氣 體配管25。該低粒子濃度氣體配管25，係從外筒21朝與 高粒子濃度氣體配管23的相反側延伸後迴轉，在其前端 部，設有和濃部噴嘴24大致在相同高度鄰接之淡部噴嘴 26。低粒子濃度氣體配管25之開口部25a，在混合流體之 流動方向係位於比一次空氣配管22的連接部更下游側（ 濃部噴嘴24側）。 濃部噴嘴24和淡部噴嘴26之位置關係爲：將用來燃 燒低粒子濃度氣體之淡部噴嘴26配置於形成火爐1之火 爐壁2側。 在分離器20的下游，在連通於濃部噴嘴24和淡部噴 嘴26之氣體流路內之至少一方，設有可改變流路截面積 之可變控制手段。 在圖示的構造，在和高粒子濃度氣體配管23 (從分離 器2 0朝濃部噴嘴24供應高粒子濃度氣體）連接之細徑部 21a內，例如設有截面三角形之中子27，以作爲可在氣體 流動方向往復移動之可動式阻抗體。該中心2 7，藉由在細 徑部21a內朝箭頭28所示之軸方向移動，能使從分離器 20連通至高粒子濃度氣體配管23之流路截面積產生變化 ，因此實質上等同於讓高粒子濃度氣體配管23的流路截 -10- 200829833 面積改變。 另外，關於可動式阻抗體，並不限於圖示之中子27 ’ 例如也可以是蝶閥等之能改變高粒子濃度氣體配管23的 流體截面積者。 在從分離器20朝淡部噴嘴26供應低粒子濃度氣體之 '氣體流路內，亦即在低粒子濃度氣體配管25內的適當位 置，係設有可變控制手段之蝶閥等的流量調整遮斷閥29。 φ 該流量調整遮斷閥29，藉由讓閥體在全開位置至全閉位置 之間變化，以調整從分離器20連通至低粒子濃度氣體配 管25之流路截面積。該流量調整遮斷閥29，視需要也能 使低粒子濃度氣體配管25形成全閉（流路截面積=〇 )。 在濃部噴嘴24和淡部噴嘴26的外周部，以包圍兩噴 嘴的周圍之方式設置連通至火爐1內之二次空氣供應流路 (二次空氣配管）3 0。該二次空氣供應流路3 0，係用來對 兩噴嘴24、26供應較高溫的空氣之二次空氣系統。 Φ 在上述分離器20，使供應自一次空氣配管22之混合 流體在外筒2 1的內部繞低粒子濃度氣體配管2 5的周圍迴 旋流動，藉此使外周側之濃部和中心部側之淡部進行離心 分離。結果，高粒子濃度氣體（微粉碳之粒子濃度較高） ’會繞低粒子濃度氣體配管25的周圍迴旋而氣體流動方 向流動，再通過細徑部21a及高粒子濃度氣體配管23而 導入濃部噴嘴24。 以粉末狀無煙碳之微粉碳爲燃料的情形，適當的燃料 粒子之濃淡分配率，亦即可持續良好的著火性及穩定燃燒 -11 - 200829833 之微粉碳粒子之濃淡分配率，係在全混合流體中，將微粉 碳93〜95 %左右及空氣量50〜55 %左右分配至濃部噴嘴24 ，將微粉碳5〜7%左右及空氣量45〜50 %左右分配至淡部 噴嘴2 6。 在上述構造之噴嘴10中，隨著鍋爐負載的變動等而 造成混合氣體供應量產生改變時，由於燃料粒子之濃淡分 配率會跟著改變，故須調整中子27的位置而維持於既定 的濃淡分配率。 具體而言，低粒子濃度氣體配管25之開口部25a係 設定成：依照額定運轉時等的既定運轉狀態所供應的混合 氣體供應量而成爲期望的濃淡分配率，當混合氣體的供應 量減少時，由於離心力降低而造成朝高粒子濃度氣體側分 配之微粉碳有減少的傾向。於是，因應混合氣體供應量之 降低使中子27朝箭頭28方向移動，而將從分離器20連 通至高粒子濃度氣體配管23之流路截面積予以增加。結 果，可減少通往濃部噴嘴24之流路阻抗，而增加分配至 濃部噴嘴24側之微粉碳量，藉此將微粉碳之濃淡分配率 調整成既定値。 此外，如此般濃淡分配率的調整，也能藉由操作設於 低粒子濃度氣體配管25之流量調整遮斷閥29來進行。 具體而言，當混合氣體的供應量減少時，因應於混合 氣體供應量的減少朝關閉方向操作流量調整遮斷閥29 ’而 使低粒子濃度氣體配管25之流路截面積減少。結果’通 往淡部噴嘴26之流路阻抗增加，另一方面通往濃部噴嘴 -12 - 200829833 24之流路阻抗相對減少，因此朝濃部噴嘴24側分配之微 粉碳量增加，藉此將微粉碳之濃淡分配率調整成既定値。 另一方面，當混合氣體的供應量增加時，因應於混合 氣體供應量的增加朝打開方向操作流量調整遮斷閥29，而 使低粒子濃度氣體配管2 5之流路截面積增加。結果，通 往淡部噴嘴2 6之流路阻抗減少，另一方面通往濃部噴嘴 24之流路阻抗相對增加，因此朝濃部噴嘴24側分配之微 φ 粉碳量減少，藉此將微粉碳之濃淡分配率調整成既定値。 如此般，微粉碳之濃淡分配率，可藉由操作中子27 或流量調整遮斷閥29之任一方來進行調整，因此只要具 備至少一方即可，當然也能同時操作雙方來進行調整。 另外，操作流量調整遮斷閥2 9使其位於全閉位置時 ，由於能遮斷低粒子濃度氣體配管2 5，例如在不使用燃燒 器1 〇的情形，可防止淡部噴嘴26朝分離器20側之逆流 〇 • 然而，在上述分離器20之外筒21，係包含從一次空 氣配管22高速流入之微粉碳粒子衝撞的區域。於是，對 於該區域之內壁面，例如像第2圖所示，視需要實施耐磨 耗處理而形成耐磨耗壁面2 1 b。 這時較佳耐磨耗處理之具體例，例如採用：貼合陶瓷 材、或進行耐曆耗硬化增厚（25Cr鑄鐵、CHR-3等）。藉 由形成這種耐磨耗壁面2 1 b，可提昇耐磨耗性，即使受到 微粉碳粒子之衝撞也不會使壁面提早變薄，而能提昇分離 器2 0之耐久性。 -13- 200829833 此外，關於上述濃部噴嘴24及淡部噴嘴26， 部噴嘴2 6配置成靠近火爐壁2側，但較佳爲，將 嘴26配置成朝水平方向之火爐壁2側偏移。亦即 噴嘴26之噴吹角度，如俯視之第1圖所示，在水 相對於噴吹方向與火爐壁2平行的濃部噴嘴24形 ，其噴吹方向係朝向火爐壁2側。這時較佳的噴吹 h，在水平方向相對於濃部噴嘴24，係朝火爐壁2 1 〇度左右的角度。 如此般，藉由使淡部噴嘴26的噴吹角度朝向少 側偏移，可防止相鄰之濃部噴嘴24及淡部噴嘴26 間發生火焰干涉，因此能持續進行低未燃成分之良 ’且能提昇著火性。再者，藉由使淡部噴嘴26的 向偏向火爐壁2，也能緩和附著於火爐1壁面之煤 物造成之結塊情形。 此外，關於上述濃部噴嘴24及淡部噴嘴26， 部噴嘴26配置成靠近火爐壁2側，但較佳爲如第 示，使濃部噴嘴24及淡部噴嘴26之噴吹角度在上 偏移。具體而言，將淡部噴嘴26之噴吹角度設定 ’將濃部噴嘴24之噴吹角度0 v向下傾斜。這時， 嘴24之適當的傾斜角度0 v，當以水平位置爲基準 爲正（+)方向時，大致在-10度〜30度的範圍， 傾斜角度（9 v爲向下3 0度。此乃基於，當傾斜角虔 於3 0度時，相鄰的上下濃部噴嘴24間將會發生火 的問題。 係將淡 淡部噴 ，淡部 平方向 成偏移 角度0 側傾斜 爐壁2 之噴嘴 好燃燒 噴吹方 灰等異 係將淡 3圖所 下方向 成水平 濃部噴 且向下 較佳的 (9 v大 焰干涉 -14- 200829833 如此般，可防止相鄰之濃部噴嘴2 4及淡部噴嘴2 6之 噴嘴間發生火焰干涉，因此能持續進行低未燃成分之良好 燃燒，且能提昇著火性。 此外，上述濃部噴嘴24及淡部噴嘴26之噴吹角度， 藉由將水平方向及上下方向之偏移加以組合，將更容易謀 求火焰干涉之防止。 依據上述之本發明，在藉由分離器20來分配難燃性 φ 燃料的燃料粒子之燃燒器1 〇中，藉由操作中子2 7或流量 調整遮斷閥29，可防止隨著運轉狀況所造成之濃淡分布率 的變動及氣體逆流，而能確保良好的著火性及穩定燃燒。 此外，藉由使部噴嘴24及淡部噴嘴26之噴吹方向形成偏 移，可防止相鄰噴嘴間之火焰干涉，藉此也能確保良好的 著火性及穩定燃燒。 本發明並不限於上述實施形態，在不脫離本發明要旨 的範圍內當然能做適當的變更。 【圖式簡單說明】 第1圖係顯示本發明之難燃性燃料用燃燒器之一實施 形態之橫截面圖。 第2圖係顯示第1圖的分離器及一次空氣配管的構造 之縱截面圖。 第3圖係顯示濃部噴嘴及淡部噴嘴的噴吹角度一例之 縱截面圖。 第4圖係顯示習知的難燃性燃料用燃燒器之橫截面圖 -15- 200829833 第5圖係顯示第4圖的濃部噴嘴及淡部噴嘴的噴吹角 度一例之縱截面圖。 【主要元件符號說明】 1 :火爐 2 :火爐壁 φ 10、10A :燃燒器 20、20A :分離器 21 :外筒 2 1 a :細徑部 2 1 b :耐磨耗壁面 22 : —次空氣配管 23 :高粒子濃度氣體配管 24 :濃部噴嘴 • 25 :低粒子濃度氣體配管 25a :開口部 26 :淡部噴嘴 27 :中子 29 :流量調整遮斷閥 3 0 :二次空氣供應流路 0 h、6» v :噴吹角度 -16-[Technical Field] The present invention relates to a burner for a flame-retardant fuel to which various combustion apparatuses such as a micro-powder carbon combustion boiler using a flame-retardant fuel are used. [Prior Art] In the past, in a micro-powder carbon combustion boiler using a fine powdery flame retardant fuel (for example, smokeless carbon or petroleum coke), a burner for burning a powdery flame retardant fuel is used. (hereinafter referred to as "burner"). For example, as shown in Figs. 4 and 5, a conventional burner 1 〇A which is burned in a furnace 1 of a boiler using fine powder carbon (fine powdered smokeless carbon) as a fuel is provided at the center of the burner. a micro-powder carbon-mixed gas system of about 100 ° C flowing through a mixture of fine carbon and primary air, and a secondary air system at a peripheral portion thereof flowing through a secondary air of about 300 to 350 ° C. . The primary air system includes a separator 20A disposed upstream of the burner portion in order to improve the ignitability. The separator 20A separates the fuel particles into a rich portion (concentrated portion) and a light portion (light portion) by the principle of cyclone separation. The downstream side of the separator of the primary air system is branched into a concentrated nozzle 24 that introduces a high particle concentration gas (the concentration of the fuel particles is high) to be combusted, and introduces a low particle concentration gas (the concentration of the fuel particles is low). Its burning light nozzle 21. In the case of using a flame retardant fuel, in order to improve the ignitability, it is common to set the burner 10A to be inclined downward. The light portion nozzle 26 is provided on the side of the furnace wall 2 forming the furnace 1 from 5 to 200829833, thereby forming an oxidizing atmosphere to prevent slugging. The symbol 23 in the figure is a high particle concentration gas pipe for guiding the high particle concentration gas from the separator 20A to the rich nozzle 24; the symbol 25 in the figure is to guide the low particle concentration gas from the separator 20A to the shallow nozzle. A low-particle-concentration gas pipe of 26 (see, for example, Japanese Laid-Open Patent Publication No. Hei 8-178210 (Fig. 5)). However, according to the above-described conventional technique, when the amount of gas is changed as φ changes with the boiler load or the like, the ignitability and stable combustion may be affected. In addition, in the case of using a flame retardant fuel, especially when the flame between adjacent nozzles occurs, the fire resistance and stable combustion are also affected. • Specifically, the efficiency of the concentration of the fuel particles is determined by the efficiency of the separator 20A. Therefore, when the partial load of the gas supply is lowered, the separation efficiency of the separator 2 Ο A is deteriorated due to the decrease in the centrifugal force, so that it is difficult to obtain the desired concentration ratio of the concentration nozzle 24 and the light nozzle 26. φ In addition, in the case where the burner is not used in a partial load or a preliminary burner or the like, a gas backflow from the light nozzle line 25 toward the separator 20A may be generated based on the negative pressure. SUMMARY OF THE INVENTION The fluctuation of the concentration distribution, the gas backflow, and the flame interference between adjacent nozzles are for the incombustible fuel burner 10A (the fuel particles of the flame retardant fuel are distributed by the separator 20A) With the influence of ignitability and stable combustion, it is expected to develop a -6 - 200829833 burner for a flame retardant fuel that can solve this problem. The present invention has been made in view of the above circumstances, and an object thereof is to provide a burner for a flame-retardant fuel which can ensure good ignitability and stable combustion even when the amount of gas changes due to a change in boiler load or the like. In the burner for a flame-retardant fuel of the present invention, the powder-like flame-retardant fuel supplied together with the air is separated by a separator, and then distributed to a rich nozzle and a shallow nozzle disposed in the furnace for combustion. The combustor for a flame-retardant fuel is characterized in that: at least one of the gas passages that communicate from the downstream of the separator to the rich nozzle and the light nozzle has a variable flow passage cross-sectional area Control means. The burner for a flame-retardant fuel according to the present invention is provided with at least one of a gas flow path that communicates from the downstream of the separator to the rich nozzle and the light nozzle, and is provided with variable control of the flow path cross-sectional area. According to the means, by appropriately changing the cross-sectional area of the flow path of the gas flow path, it is possible to adjust the optimum enthalpy according to the operating conditions such as partial load. In the burner for a flame retardant fuel as described above, the variable control means is a movable resistor body provided in a gas flow path for supplying a high particle concentration gas from the separator to the rich nozzle. Thereby, the flow path cross-sectional area of the gas flow path for supplying the high particle concentration gas to the rich portion nozzle can be appropriately changed. Therefore, the flow rate of the gas in the gas flow path for supplying the high particle concentration gas can be adjusted in accordance with the operation state, so that the separation efficiency of the separator can be optimized in accordance with the operational conditions such as partial load. Preferably, the combustible fuel burner is configured such that the variable control means is configured to adjust a flow rate in a gas flow path for supplying a low particle concentration -7 - 200829833 degree gas from the separator to the light nozzle. Interrupt valve. Thereby, the cross-sectional area of the gas flow path for supplying the low particle concentration gas to the shallow nozzle can be appropriately changed from fully open to fully closed. Therefore, the flow rate of the gas in the gas flow path for supplying the low particle concentration gas can be adjusted according to the operation state, or the gas flow path can be blocked when the burner is not used. It is preferable that the combustor for the flame-retardant fuel is subjected to abrasion resistance treatment on the wall surface of the flame-resistant fuel supplied to the separator, thereby enhancing the wall surface against which the flame-retardant fuel collides. Wear resistance. In the burner for a flame-retardant fuel of the present invention, the powder-like flame-retardant fuel supplied together with the air is separated by a separator, and then distributed to a rich nozzle and a shallow nozzle disposed in the furnace for combustion. A burner for a flame-retardant fuel, characterized in that a blowing angle of the rich nozzle and the shallow nozzle is shifted in the vertical direction. By using such a burner for a flame retardant fuel, since the blowing angles of the rich nozzle and the shallow nozzle are shifted in the vertical direction, it is possible to prevent flame interference between the nozzles. In the burner for a flame-retardant fuel of the present invention, the powder-like flame-retardant fuel supplied together with the air is separated by a separator, and then distributed to a rich nozzle and a shallow nozzle disposed in the furnace for combustion. A burner for a flame retardant fuel is characterized in that a blowing angle of the light nozzle is shifted toward a furnace wall side in a horizontal direction. By using such a burner for a flame retardant fuel, since the blowing angle of the shallow nozzle is shifted toward the furnace wall side in the horizontal direction, flame interference between the nozzles can be prevented, and agglomeration of the wall of the furnace can be prevented. . -8-200829833 According to the present invention, the burner for a flame-retardant fuel of fuel particles distributed by a separator can prevent fluctuations in the concentration ratio of the light and the reverse flow of the gas, thereby ensuring stability and stable combustion. In addition, by preventing flame interference between adjacent nozzles, good ignitability and stable combustion. [Embodiment] Hereinafter, an embodiment of the flame-retardant combustion of the present invention will be described with reference to the drawings. The combustion "burner" 10 for the flame retardant fuel shown in Figs. 1 to 3 is, for example, provided in the fine carbon combustion pot 1. This burner 10 burns hard particles (fine powder) which are supplied together with air in the furnace 1. Specific examples of this material include smokeless carbon and petroleum coke. #以下说明: A combustor burner 10 that supplies a non-flammable fuel of smokeless carbon into a (micronized carbon fuel) and combusts it with: a lower temperature micronized carbon of about 100 ° C is supplied together. A micro-powder carbon supply system, a secondary air system that supplies about 300 rpm to high temperature secondary air. The micro-powder carbon supply system is generally located in the combustor 10 and is provided for the purpose of improving the ignitability: a separation fluid for distributing primary carbon to a concentration of a concentrated portion and a light portion to be described later. The cyclone separator can also ensure the use of burners for good fuels in the case of fire-fighting fuels that are in good working condition (hereinafter referred to as furnaces, such as furnaces, non-flammable, fine powder, 10° primary air and - 3 5 ° ° ° center, air and micro-powder 20. The side of the sub-cylinder 2 1 -9- 200829833, connected with a primary air supply 22 ° from the tangential direction of the mixed fluid in the outer tube 21 The narrow-diameter portion 2 1 a ' is connected to the high-particle-concentration gas pipe 23, and the rich portion nozzle 24 that opens toward the inside of the furnace 1 is provided at the tip end portion thereof. The inside of the outer cylinder 21 is concentrically arranged. The low particle concentration gas pipe 25 is rotated from the outer cylinder 21 toward the side opposite to the high particle concentration gas pipe 23, and is rotated at the tip end portion thereof. phase The opening portion 25a of the low-particle-concentration gas pipe 25 is located on the downstream side (the rich portion nozzle 24 side) of the connection portion of the primary air pipe 22 in the flow direction of the mixed fluid. The positional relationship between the shallow portion nozzles 26 and the light portion nozzles 26 is such that the light portion nozzles 26 for burning the low particle concentration gas are disposed on the side of the furnace wall 2 forming the furnace 1. On the downstream side of the separator 20, the nozzles 24 are connected to the rich portion. At least one of the gas flow paths of the nozzles 26 is provided with a variable control means for changing the cross-sectional area of the flow path. The structure shown in the figure is connected to the high-concentration gas pipe 23 (from the separator 20 to the rich nozzle) In the small-diameter portion 21a to which the high-particle-concentration gas is supplied, for example, a triangular intermediate portion 27 is provided as a movable resistor that can reciprocate in the gas flow direction. The center 2, 7 is at a small diameter The inside of the portion 21a is moved in the axial direction indicated by the arrow 28, and the cross-sectional area of the flow path from the separator 20 to the high-particle-concentration gas pipe 23 is changed, so that it is substantially equivalent to the flow of the high-particle-concentration gas pipe 23. In addition, the movable resistor is not limited to the illustrated intermediate portion 27'. For example, it may be a butterfly valve or the like that can change the cross-sectional area of the gas of the high particle concentration gas pipe 23. The separator 20 supplies a low-particle-concentration gas in the gas flow path to the light-hand nozzle 26, that is, at a suitable position in the low-particle-concentration gas pipe 25, and is provided with a flow-regulating shut-off valve such as a butterfly valve of a variable control means. 29. φ The flow rate adjustment shutoff valve 29 adjusts the flow path cross-sectional area from the separator 20 to the low particle concentration gas pipe 25 by changing the valve body between the fully open position and the fully closed position. The flow rate adjustment shutoff valve 29 can also form the low particle concentration gas pipe 25 to be fully closed (flow path cross-sectional area = 〇) as needed. In the outer peripheral portion of the rich portion nozzle 24 and the shallow portion nozzle 26, a secondary air supply flow path (secondary air pipe) 30 that communicates with the inside of the furnace 1 is provided so as to surround the periphery of the two nozzles. The secondary air supply flow path 30 is a secondary air system for supplying higher temperature air to the two nozzles 24, 26. Φ In the separator 20, the mixed fluid supplied from the primary air pipe 22 is swirled around the low-particle-concentration gas pipe 25 inside the outer cylinder 21, whereby the rich portion and the central portion side of the outer peripheral side are lightly colored. The part is centrifuged. As a result, the high particle concentration gas (high particle concentration of the fine powder carbon) is swirled around the low particle concentration gas pipe 25 to flow in the gas flow direction, and is introduced into the rich portion through the small diameter portion 21a and the high particle concentration gas pipe 23. Nozzle 24. In the case of powdered smokeless carbon micro-powder carbon fuel, the appropriate distribution ratio of the fuel particles, that is, the sustainable good ignitability and stable combustion -11 - 200829833, the distribution ratio of the fine powder carbon particles is in the full mixing In the fluid, about 93 to 95% of the fine carbon powder and about 50 to 55 % of the air amount are distributed to the rich portion nozzle 24, and about 5 to 7% of the fine carbon powder and about 45 to 50% of the air amount are distributed to the light portion nozzle 26. In the nozzle 10 of the above configuration, when the supply amount of the mixed gas is changed in accordance with the fluctuation of the boiler load or the like, since the distribution ratio of the fuel particles is changed, the position of the neutron 27 must be adjusted to maintain the predetermined density. Distribution rate. Specifically, the opening portion 25a of the low-particle-concentration gas pipe 25 is set to have a desired light-shadow distribution ratio in accordance with the supply amount of the mixed gas supplied in a predetermined operational state such as the rated operation time, and when the supply amount of the mixed gas is decreased. The fine powder carbon which is distributed toward the high particle concentration gas side tends to decrease due to a decrease in centrifugal force. Then, the neutron 27 is moved in the direction of the arrow 28 in response to the decrease in the supply amount of the mixed gas, and the cross-sectional area of the flow path from the separator 20 to the high particle concentration gas pipe 23 is increased. As a result, the flow path impedance to the rich nozzle 24 can be reduced, and the amount of fine powder carbon distributed to the rich portion nozzle 24 side can be increased, thereby adjusting the dilution ratio of the fine powder carbon to a predetermined enthalpy. Further, the adjustment of the shading ratio can be performed by operating the flow rate adjustment shutoff valve 29 provided in the low particle concentration gas pipe 25. Specifically, when the supply amount of the mixed gas is decreased, the flow rate adjustment shutoff valve 29' is operated in the closing direction in response to the decrease in the supply amount of the mixed gas, and the flow path cross-sectional area of the low particle concentration gas pipe 25 is reduced. As a result, the impedance of the flow path leading to the shallow nozzle 26 is increased, and on the other hand, the impedance of the flow path leading to the rich nozzle -12 - 200829833 24 is relatively reduced, so that the amount of fine powder carbon distributed toward the rich nozzle 24 side is increased. The distribution ratio of the fine carbon carbon is adjusted to a predetermined enthalpy. On the other hand, when the supply amount of the mixed gas is increased, the flow rate adjustment shutoff valve 29 is operated in the opening direction in response to an increase in the supply amount of the mixed gas, and the flow path cross-sectional area of the low particle concentration gas pipe 25 is increased. As a result, the flow path impedance to the light nozzles 26 is reduced, and on the other hand, the impedance of the flow path to the rich nozzles 24 is relatively increased, so that the amount of micro φ powder carbon distributed toward the rich portion nozzles 24 is reduced, thereby The distribution ratio of the fine powder carbon is adjusted to the predetermined enthalpy. In this way, the distribution ratio of the fine powder carbon can be adjusted by operating either the neutron 27 or the flow rate adjusting valve 29, so that it is sufficient to have at least one of them, and it is of course possible to perform both of them simultaneously. Further, when the flow rate adjustment shutoff valve 29 is operated to be in the fully closed position, since the low particle concentration gas pipe 25 can be blocked, for example, when the burner 1 is not used, the shallow nozzle 26 can be prevented from being directed toward the separator. Countercurrent flow on the 20 side. However, the outer cylinder 21 of the separator 20 includes a region where the fine carbon particles flowing in from the primary air pipe 22 collide at a high speed. Then, for the inner wall surface of the region, for example, as shown in Fig. 2, wear-resistant treatment is performed as needed to form the wear-resistant wall surface 2 1 b. In this case, a specific example of the wear resistance treatment is preferably used, for example, by laminating a ceramic material or by hardening and hardening (25Cr cast iron, CHR-3, etc.). By forming such a wear-resistant wall surface 2 1 b, the wear resistance can be improved, and even if the collision with the fine powder carbon particles does not cause the wall surface to be thinned earlier, the durability of the separator 20 can be improved. Further, in the concentrated nozzle 24 and the shallow nozzle 26, the nozzles 26 are disposed close to the furnace wall 2, but it is preferable that the nozzles 26 are disposed to be offset toward the furnace wall 2 side in the horizontal direction. . That is, the blowing angle of the nozzle 26 is, as shown in Fig. 1 of the plan view, in the shape of the rich nozzle 24 in which the water is parallel to the furnace wall 2 with respect to the blowing direction, and the blowing direction thereof is directed toward the furnace wall 2 side. At this time, the preferred blowing h is horizontally directed to the rich nozzle 24 at an angle of about 1 degree to the furnace wall 2 1 . In this manner, by shifting the blowing angle of the shallow nozzles 26 toward the lesser side, it is possible to prevent flame interference between the adjacent rich nozzles 24 and the shallow nozzles 26, so that the low unburned components can be continued. And can improve the fire. Further, by biasing the direction of the pale portion nozzle 26 toward the furnace wall 2, it is possible to alleviate the agglomeration caused by the coal adhering to the wall surface of the furnace 1. Further, in the concentrated portion nozzle 24 and the shallow portion nozzle 26, the partial nozzles 26 are disposed close to the furnace wall 2 side, but preferably, as shown in the above, the blowing angles of the rich portion nozzles 24 and the shallow portion nozzles 26 are shifted upward. shift. Specifically, the blowing angle of the light nozzles 26 is set to 'the blowing angle 0 v of the rich nozzles 24 is inclined downward. At this time, the proper inclination angle 0 v of the nozzle 24 is approximately in the range of -10 degrees to 30 degrees when the horizontal position is the positive (+) direction, and the inclination angle (9 v is 30 degrees downward). It is based on the fact that when the tilt angle is at 30 degrees, there will be a problem of fire between the adjacent upper and lower concentrated nozzles 24. The light portion will be sprayed, and the light portion will be offset in the horizontal direction. The nozzle is good to burn, and the ash, etc., will be sprayed into the horizontal concentrated portion and the downward direction is better (9 v daze interference -14-200829833), so that the adjacent thick nozzle 2 can be prevented. 4, and the flame interference occurs between the nozzles of the light nozzles 26, so that good combustion of the low unburned components can be continued, and the ignitability can be improved. Further, the blowing angles of the concentrated nozzles 24 and the shallow nozzles 26 are borrowed. By combining the offsets in the horizontal direction and the vertical direction, it is easier to prevent the flame interference. According to the present invention described above, the burner 1 in which the fuel particles of the flame retardant φ fuel are distributed by the separator 20 is used. , by operating the neutron 27 or flow adjustment interrupt valve 29 It is possible to prevent fluctuations in the distribution ratio of the light and darkness and the reverse flow of the gas, and to ensure good ignitability and stable combustion. Further, by shifting the blowing directions of the nozzles 24 and the light nozzles 26, The present invention is not limited to the above-described embodiments, and can be appropriately modified without departing from the gist of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a cross-sectional view showing an embodiment of a burner for a flame-retardant fuel of the present invention. Fig. 2 is a longitudinal cross-sectional view showing a structure of a separator and a primary air pipe of Fig. 1. Fig. 3 is a longitudinal cross-sectional view showing an example of a blowing angle of a rich nozzle and a shallow nozzle. Fig. 4 is a cross-sectional view showing a conventional burner for a flame retardant fuel. Fig. -15 - 200829833 Fig. 5 shows Fig. 4 is a longitudinal cross-sectional view showing an example of a blowing angle of a rich nozzle and a shallow nozzle. [Description of main components] 1 : Furnace 2: Furnace wall φ 10, 10A: Burner 20, 20A: Separator 21: External Cartridge 2 1 a : Small-diameter portion 2 1 b : wear-resistant wall surface 22 : - secondary air pipe 23 : high particle concentration gas pipe 24 : rich portion nozzle • 25 : low particle concentration gas pipe 25 a : opening portion 26 : light portion nozzle 27 : neutron 29 : Flow adjustment blocking valve 3 0 : Secondary air supply flow path 0 h, 6» v : blowing angle -16-