JP3716096B2 - Pulverized coal separator - Google Patents

Pulverized coal separator Download PDF

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JP3716096B2
JP3716096B2 JP09001498A JP9001498A JP3716096B2 JP 3716096 B2 JP3716096 B2 JP 3716096B2 JP 09001498 A JP09001498 A JP 09001498A JP 9001498 A JP9001498 A JP 9001498A JP 3716096 B2 JP3716096 B2 JP 3716096B2
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pulverized coal
separator
mixture
density
concentration
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JPH11287433A (en
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八郎 川島
浩 谷川
章泰 岡元
克彦 篠田
啓樹 山口
五輪麿 天野
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Mitsubishi Heavy Industries Ltd
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Mitsubishi Heavy Industries Ltd
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【０００１】
【発明の属する技術分野】
本発明は、微粉炭と空気の混合気、即ち微粉炭混合気をバーナに導く微粉炭管内に設けられ、微粉炭混合気に濃淡分離を与えるための微粉炭セパレータ装置に関する。
【０００２】
【従来の技術】
産業用及び事業用ボイラにおける微粉炭焚きバーナでは、燃焼炉壁面を構成する伝熱チューブへの灰付着防止、ＮＯｘ発生量の低減、それに着火安定燃焼などの目的で、微粉炭焚きバーナへ供給される微粉炭混合気に濃淡分離を付与するため微粉炭セパレータ装置が用いられる。
【０００３】
従来の微粉炭セパレータの例を図１１〜図１４に示してある。これらの図において、０１はバーナに微粉炭混合気０３を導く微粉炭管、０５は微粉炭ノズル、０６は二次空気０７を導く二次空気ノズルである。微粉炭ノズル０５に燃焼用一次空気と共に一定の流速及び温度を保ちながら微粉炭混合気０３を導く微粉炭管０１内にはキッカブロック０２とリボンスクリュウ０４からなる微粉炭セパレータが配設されている。
【０００４】
キッカブロック０２は微粉炭管０１のベント部前の内側に設置され、流れ方向に対し傾斜した面を有している。微粉炭管０１のベント部下流の水平部分に配設されたリボンスクリュウ０４は、水平又は或る傾斜した角度から流れに沿って鉛直位置までひねりを加えられている。
【０００５】
このようなキッカブロック０２とリボンスクリュウ０４とによって構成された微粉炭セパレータ装置を配設した微粉炭管０１内を流れる微粉炭混合気０３は、ベント部により偏流を生じ、さらにキッカブロック０２の作用により微粉炭混合気０３に濃淡が生ずる。すなわち、図１１において、微粉炭管０１内にはそのベント部下流において外側（図の上側）で微粉炭濃度が高く、内側（図の下側）で微粉炭濃度が低いという濃淡が生ずる。このように濃淡を形成した微粉炭混合気０３はリボンスクリュウ０４に流入する。
【０００６】
リボンスクリュウ０４は、上流側で微粉炭管０１の水平軸方向に対し、微粉炭混合気０３の濃淡分離が形成される境界線に沿って濃淡を分離遮断するように入口面が配置され、下流側は微粉炭管０１の末端で完全に鉛直面となるよう流れに沿って徐々にひねりを加えてある。従って、リボンスクリュウ０４の出口では、微粉炭混合気０３は、出口側から見て、左側に微粉炭淡混合気、右側に微粉炭濃混合気を形成し微粉炭ノズル０５に達する。
【０００７】
一方、燃焼用二次空気０７は図示されていない二次空気供給設備から図１４に見られるように左右オフセットとなっている二次空気ノズル０６を介してそれぞれ流量が異なるコンク用二次空気０７Ｃ、及びウイーク用二次空気０７Ｗとして炉内に噴出される。
【０００８】
前者のコンク用二次空気０７Ｃは濃度の高い微粉炭混合気０３と接触混合し、微粉炭ノズル０５周囲で着火し微粉炭濃度の高いコンク炎を形成する。また、後者のウイーク用二次空気０７Ｗは濃度の低い微粉炭混合気０３と接触混合し微粉炭ノズル０５後流側（炉内）で着火燃焼し、微粉炭濃度の低いウイーク炎を形成する。
【０００９】
これらの作用により燃焼炉壁面ではウイーク炎、燃焼炉中央ではコンク炎を形成させ、燃焼炉壁面の伝熱チューブへの灰付着防止及びＮＯｘ発生量低減を達成し、かつ着火安定燃焼を可能にするものである。
【００１０】
【発明が解決しようとする課題】
前記した従来の微粉炭セパレータ装置においては、送り込まれたきた微粉炭混合気０３は、微粉炭セパレータに設置されているリボンスクリュウ０４の作用で、微粉炭管０１末端（微粉炭ノズル０５直前）で左、右に濃淡分離された後、直ちに微粉炭ノズル０５に達し、助走距離が取れていない。このため、一旦微粉炭管内０１で濃淡分離したものの、微粉炭ノズル０５内では旋回流が残り再度分散され良好な濃淡分離が形成できず、ひいては着火安定性に欠け所期の目標達成が困難となる。
【００１１】
このように、従来の微粉炭セパレータ装置では濃淡分離作用が不充分なものであったことに鑑み、本発明は、微粉炭と空気とを含む微粉炭混合気をバーナに導く微粉炭管内に配置され、その微粉炭混合気の濃淡分離を行う微粉炭セパレータ装置において、着火安定性が良い濃淡微粉炭混合気を左右方向に確立させることのできる微粉炭セパレータ装置を提供することを課題としている。
【００１４】
【課題を解決するための手段】
前記課題を解決するため、本発明は、リボンスクリュウの下流に、同リボンスクリュウによって左右に分離された濃淡微粉炭混合気のそれぞれを上下での微粉炭濃度を高くするよう濃淡分離する横長の濃淡分離器を配置し、同濃淡分離器は中央部に上流から下流に開通する中空切欠きスリットを設けた構成の微粉炭セパレータ装置を提供する。
【００１５】
このように構成した本発明の微粉炭セパレータ装置によれば、リボンスクリュウによって左右に濃淡分離された微粉炭混合気は更に上下での微粉炭濃度が高くなるように濃淡分離されるので、左右方向に形成された濃淡分離によって燃焼炉壁面の伝熱チューブへの灰付着低減を達成しつつ、左右の濃淡混合気のそれぞれにおいて上下に濃度の高い部分を形成されることとなり、濃淡各混合気における着火保炎性が一段と向上され、また、ＮＯｘの発生量も低減される。
しかも濃淡分離器の中央部に設けた上流から下流に開通する中空切欠きスリットにより同濃淡分離器の底面に発生し易い渦流によるよどみを解消する。
【００１６】
さらに本発明は、前記課題を解決するため、リボンスクリュウの下流に、そのリボンスクリュウによって左右に分離された濃淡微粉炭混合気をさらに左右に濃淡分離する縦長の濃淡分離器を微粉炭管内に配置し、同濃淡分離器は中央部に上流から下流に開通する中空切欠きスリットを設けた構成の微粉炭セパレータ装置を提供する。
【００１７】
本発明のこの微粉炭セパレータ装置によれば、左右方向に形成された濃淡微粉炭混合気の各々において更に左右に濃淡が形成され着火保炎性が向上された状態で燃焼炉壁面の伝熱チューブへの灰付着低減を達成することができる。
しかも濃淡分離器は中央部に設けた上流から下流に開通する中空切欠きスリットにより、同濃淡分離器の底面に発生し易い渦流によるよどみを解消する。
【００１８】
【発明の実施の形態】
以下、本発明による微粉炭セパレータ装置について図１、図２に示した参考例及び、図３〜図１０に示した実施の形態に基づいて具体的に説明する。なお、以下の実施の形態及び参考例において、図１１〜図１４に示した従来の装置と同じ構成の部分には説明を簡単にするため同じ符号を付してある。
【００１９】
（参考例）
まず、図１及び図２に示す参考例による微粉炭セパレータ装置について説明する。図１及び図２において、０８は整流板である。微粉炭管０１の内部に配置されたリボンスクリュウ０４は、図１１に示された従来のものよりもひねり角度を大きくしてあり、水平面の状態から鉛直面となる終端に達する迄の微粉炭管０１における軸方向長さが短くなっている。
【００２０】
そして、短くなったリボンスクリュウ０４の後流側にはリボンスクリュウ０４の末端と同形状の整流板０８が微粉炭管０１の末端（微粉炭ノズル０５の入口）までに亘って配設されている。
【００２１】
この整流板０８の設置長さ（Ｌ）は、微粉炭管０１の高さ（Ｈ）に対し、Ｌ＝０．３Ｈ〜０．８Ｈとするのがよいが、Ｌ＝０．６Ｈが好ましいことがわかった。図１及び図２に示した微粉炭セパレータのその他の構成は、図１１〜図１４に示したものと同等であり、その説明を省略する。
【００２２】
この参考例のものでは、前記したようにリボンスクリュウの長さを従来のものよりも短い区間でねじりを与えているが、このようにリボンスクリュウ０４はある程度短区間で収束させてもその効果が低下する事はない。そして、このリボンスクリュウ０４に沿って流れ、微粉炭管０１内で左右に濃淡分離された微粉炭混合気０３は整流板０８に導かれ一定の助走区間を経て微粉炭ノズル０５に達する。
【００２３】
整流板０８の効果により、リボンスクリュウ０４を出た微粉炭混合気０３は旋回流を緩和され、適度に整流された状態で微粉炭ノズル０５に達する。この効果により、濃淡分離された微粉炭混合気０３の再分散は解消され、目標性能を達成できるものとなる。
【００２４】
（第１実施形態）
次に、図３〜図７に示した第１実施形態による微粉炭セパレータ装置について説明する。図３〜図７において、０９はリボンスクリュウ０４の後流側に配設された濃淡分離器を示し、支柱１０によって微粉炭管０１内に固定されている。
【００２５】
この濃淡分離器０９は、図に示されているように流れ方向に断面形状に広がる面０９−１と、その後の水平な面０９−２と、水平軸心に対して直角な底面０９−３とを有し、水平軸心中央部に中空切欠きスリット０９−４を有している。また、その形状は微粉炭管０１内で幅方向が広く、高さ方向に狭くなっている。なお、リボンスクリュウ０４は、前記参考例の場合と同様、微粉炭管０１の軸方向に短い区間でねじりを与えられている。その他の構成は前記参考例のものと同様であり、その説明を省略する。
【００２６】
なお、この第１実施形態による微粉炭セパレータにおいて、濃淡分離器０９の各部寸法は、図６、図７に示す符号について、θ＝６０°〜９０°（好ましくは９０°）、Ｌ＝０．４〜０．６Ｈ（好ましくは０．５Ｈ）、ｈ１＝０．４〜０．６Ｈ（好ましくは０．５Ｈ）、Ｗ２＝Ｗ１（２ｍｍ〜６ｍｍ）（作動が可能な限り隙間が狭いほど好ましい）を選定するのがよい。
【００２７】
このように構成された第１実施形態による微粉炭セパレータ装置において、微粉炭管０１を通過中の微粉炭混合気０３はリボンスクリュウ０４の作用により、濃淡を左右に分離され、その後、濃淡混合気はそれぞれが濃淡分離器０９に衝突し微粉炭は慣性力を付与され微粉炭管０１の上、下内周面に集まる。
【００２８】
このため微粉炭管０１内の内周面（上下）では微粉炭濃度が高く、中央側は微粉炭濃度が低くなる。即ち軸方向の軸心を起点として微粉炭ノズル０５の左側、右側でさらに上下に濃淡分離が形成される。また、中空切欠きスリット０９−４により一部の微粉炭混合気０３を導き、濃淡分離器の底面０９−３に発生し易い渦流によるよどみを解消する。
【００２９】
この作用で、従来のコンク炎はさらに微粉炭濃度の高い超コンク炎と微粉炭濃度のうすいコンク炎を形成し、また、従来のウイーク炎はやや濃いウイーク炎と極めてうすいウイーク炎を形成する。前記作用により燃焼炉壁面の伝熱チューブへの灰付着を低減させながら、着火保炎性がさらに向上し、かつＮＯｘ発生量を低減できる。
【００３０】
（第２実施形態）
次に、図８〜図１０に示した第２実施形態による微粉炭セパレータ装置について説明する。これらの図において、０９はリボンスクリュウ０４の後流側に配設された濃淡分離器を示し、支柱１０によって微粉炭管０１内に固定されている。
【００３１】
この濃淡分離器０９は、第１実施形態のものと違って、縦（上下）方向に幅広く、横（左右）方向に狭い方を向けて配置されている。このため、この濃淡分離器０９により微粉炭混合気０３は左右に微粉炭を振り分ける。その他の構成は、第１実施形態のものと実質同じである。
【００３２】
この第２実施形態による微粉炭セパレータ装置では、リボンスクリュウ０４の作用で濃淡を左右に分離された微粉炭混合気０３は、濃淡分離器０９により微粉炭管０１内周面（左、右）に分離されて微粉炭ノズル０５に導かれ、より濃度の高いコンク炎及び、より濃度のうすいウイーク炎を形成する。
【００３４】
【発明の効果】
以上説明したように、本発明による微粉炭セパレータ装置は、水平又は或る角度から流れに沿って鉛直位置までひねりを加えたリボンスクリュウと、同リボンスクリュウによって左右に分離された濃淡微粉炭混合気のそれぞれを上下での微粉炭濃度を高くする横長の濃淡分離器とを微粉炭管内に配置し、同濃淡分離器は中央部に上流から下流に開通する中空切欠きスリットを設けたもので、これによれば、左右に濃淡分離された微粉炭混合気のそれぞれにおいて上下での微粉炭濃度を高くされるので、所期どおりの濃淡分離が与えられた着火保炎性の優れた微粉炭混合気流が形成され、しかもその際、濃淡分離器は中央部に設けた上流から下流に開通する中空切欠きスリットにより同濃淡分離器の底面に発生し易い渦流によるよどみを解消する。
【００３５】
更に、また、本発明による微粉炭セパレータ装置は、水平又は或る角度から流れに沿って鉛直位置までひねりを加えたリボンスクリュウと、同リボンスクリュウによって左右に分離された濃淡微粉炭混合気をさらに左右に濃淡分離する縦長の濃淡分離器とを微粉炭管内に配置し、同濃淡分離器は中央部に上流から下流に開通する中空切欠きスリットを設けたもので、これによれば、左右方向に形成された濃淡微粉炭混合気の各々において更に左右方向に濃淡が形成され、所期どおり濃淡分離されて着火保炎性のよい微粉炭混合気が形成され、しかもその際、濃淡分離器は中央部に設けた上流から下流に開通する中空切欠きスリットにより、同濃淡分離器の底面に発生し易い渦流によるよどみを解消する。
【図面の簡単な説明】
【図１】 本発明の参考例による微粉炭セパレータ装置の断面図。
【図２】図１に示した微粉炭セパレータ装置における整流板の配置状態を示す断面図。
【図３】 本発明の第１実施形態による微粉炭セパレータ装置の水平断面図。
【図４】図３のIV−IV線に沿う断面図。
【図５】図４のＶ−Ｖ線に沿う断面図。
【図６】図４に示した微粉炭セパレータ装置における濃淡分離器の寸法、形状を示した断面図。
【図７】図６のVII −VII 線に沿う断面図。
【図８】 本発明の第２実施形態による微粉炭セパレータ装置の断面図。
【図９】図８のIX−IX線に沿う断面図。
【図１０】図９のＸ−Ｘ線に沿う断面図。
【図１１】従来の微粉炭セパレータ装置の１例を示す断面図。
【図１２】図１１のXII −XII 線に沿う断面図。
【図１３】図１１のXIII−XIII線に沿う断面図。
【図１４】図１１のXIV −XIV 線に沿う断面図。
【符号の説明】
０１ 微粉炭管
０２ キッカブロック
０３ 微粉炭混合気
０４ リボンスクリュウ
０５ 微粉炭ノズル
０６ 二次空気ノズル
０７ 二次空気
０７Ｃ コンク用二次空気
０７Ｗ ウイーク用二次空気
０８ 整流板
０９ 濃淡分離器
０９−１ 広がる面
０９−２ 水平な面
０９−３ 底面
０９−４ 中空切欠きスリット
１０ 支柱[0001]
BACKGROUND OF THE INVENTION
TECHNICAL FIELD The present invention relates to a pulverized coal separator device that is provided in a pulverized coal pipe that guides a mixture of pulverized coal and air, that is, a pulverized coal mixture to a burner, and provides concentration separation to the pulverized coal mixture.
[0002]
[Prior art]
In pulverized coal burning burners for industrial and commercial boilers, pulverized coal burning burners are supplied to the pulverized coal burning burner for the purposes of preventing ash adhesion to the heat transfer tubes that make up the wall of the combustion furnace, reducing the amount of NOx generated, and stable ignition combustion. A pulverized coal separator device is used to provide concentration separation to the pulverized coal mixture.
[0003]
Examples of conventional pulverized coal separators are shown in FIGS. In these figures, 01 is a pulverized coal pipe for introducing pulverized coal mixture 03 to the burner, 05 is a pulverized coal nozzle, and 06 is a secondary air nozzle for guiding secondary air 07. A pulverized coal separator comprising a kicker block 02 and a ribbon screw 04 is disposed in the pulverized coal pipe 01 that guides the pulverized coal mixture 03 together with the primary air for combustion to the pulverized coal nozzle 05 while maintaining a constant flow rate and temperature. .
[0004]
The kicker block 02 is installed inside the front of the vent portion of the pulverized coal pipe 01 and has a surface inclined with respect to the flow direction. The ribbon screw 04 disposed in the horizontal portion downstream of the vent portion of the pulverized coal pipe 01 is twisted from the horizontal or a certain inclined angle to the vertical position along the flow.
[0005]
The pulverized coal mixture 03 flowing in the pulverized coal pipe 01 in which the pulverized coal separator device constituted by such a kicker block 02 and the ribbon screw 04 is disposed is caused to drift by the vent portion, and further the action of the kicker block 02. As a result, the pulverized coal mixture 03 is shaded. That is, in FIG. 11, the pulverized coal pipe 01 has a density in which the pulverized coal concentration is high on the outer side (upper side in the drawing) and the pulverized coal concentration is lower on the inner side (lower side in the drawing). The pulverized coal mixture 03 that forms the light and shade in this way flows into the ribbon screw 04.
[0006]
Ribbon screw 04 has an inlet face arranged on the upstream side so as to separate and block the density along the boundary line where the density separation of pulverized coal mixture 03 is formed with respect to the horizontal axis direction of pulverized coal pipe 01. The side is gradually twisted along the flow so that it is completely vertical at the end of the pulverized coal pipe 01. Accordingly, at the outlet of the ribbon screw 04, the pulverized coal mixture 03 reaches the pulverized coal nozzle 05 by forming a pulverized coal light mixture on the left side and a pulverized coal rich mixture on the right side as viewed from the outlet side.
[0007]
On the other hand, the secondary air for combustion 07 has a different flow rate through the secondary air nozzle 06 which is offset from the secondary air supply facility (not shown) as shown in FIG. , And the secondary air for week 07W is ejected into the furnace.
[0008]
The former secondary air for conc 07C is contact-mixed with the pulverized coal mixture 03 having a high concentration and ignited around the pulverized coal nozzle 05 to form a conc flame having a high pulverized coal concentration. Further, the latter secondary air 07W for week is mixed in contact with the low-concentration pulverized coal mixture 03 and ignited and combusted on the downstream side (inside the furnace) of the pulverized coal nozzle 05 to form a weak flame having a low pulverized coal concentration.
[0009]
By these actions, a weak flame is formed on the wall of the combustion furnace and a conch flame is formed at the center of the combustion furnace, preventing ash adhesion to the heat transfer tube on the wall of the combustion furnace, reducing NOx generation, and enabling stable ignition combustion. Is.
[0010]
[Problems to be solved by the invention]
In the above-described conventional pulverized coal separator device, the pulverized coal mixture 03 that has been sent in is at the end of the pulverized coal pipe 01 (just before the pulverized coal nozzle 05) by the action of the ribbon screw 04 installed in the pulverized coal separator. After the light and shade separation on the left and right, the pulverized coal nozzle 05 is reached immediately and the running distance is not taken. For this reason, although the density separation is once performed in the pulverized coal pipe 01, the swirl flow remains in the pulverized coal nozzle 05 and is dispersed again, and a good density separation cannot be formed. As a result, the ignition stability is lacking and it is difficult to achieve the desired target. Become.
[0011]
In this way, in view of the fact that the conventional pulverized coal separator device has insufficient density separation action, the present invention is arranged in a pulverized coal pipe that guides a pulverized coal mixture containing pulverized coal and air to a burner. Therefore, an object of the present invention is to provide a pulverized coal separator that can establish a pulverized coal mixture with good ignition stability in the left-right direction in a pulverized coal separator that performs concentration separation of the pulverized coal mixture.
[0014]
[ Means for Solving the Problems ]
To solve the above problems, the present invention is re downstream of Bonsukuryuu, oblong to gray separation to increase the pulverized coal concentration of the respective upper and lower shades pulverized coal mixture which is separated into right and left by the ribbon screw A concentration separator is provided, and the concentration separator provides a pulverized coal separator having a structure in which a hollow notch slit opened from upstream to downstream is provided in the center.
[0015]
According to the pulverized coal separator device of the present invention configured in this way, the pulverized coal mixture separated into the left and right by the ribbon screw is further separated so that the pulverized coal concentration at the upper and lower sides becomes higher. the heat transfer achieved quality one ash adhesion reduction of the tube, will be formed a portion having a high concentration in the vertical at each of the right and left shade mixture, dark and light air-fuel mixture in a combustion furnace wall by the formed shading separated Ignition flame-holding performance in is further improved, and the amount of NOx generated is also reduced.
Moreover, stagnation due to eddy currents that are likely to occur on the bottom surface of the density separator is eliminated by a hollow notch slit provided from the upstream to the downstream provided in the center of the density separator.
[0016]
Furthermore, in order to solve the above-mentioned problems, the present invention arranges a vertically long and thin separator in the pulverized coal pipe downstream of the ribbon screw to further separate the dark and pulverized coal mixture separated left and right by the ribbon screw into left and right. And the same density separator provides the pulverized coal separator apparatus of the structure which provided the hollow notch slit opened in the center part from the upstream to the downstream .
[0017]
According to the pulverized coal separator device of the present invention, the heat transfer tube on the wall of the combustion furnace in a state where the density is further formed in the left and right in each of the concentrated pulverized coal mixture formed in the left-right direction and the ignition flame holding property is improved. A reduction in ash adhesion to can be achieved.
In addition, the stagnation due to the eddy current that is likely to be generated on the bottom surface of the density separator is eliminated by the hollow notch slit opened from the upstream to the downstream provided in the central portion of the density separator.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the pulverized coal separator device according to the present invention will be described in detail based on the reference examples shown in FIGS . 1 and 2 and the embodiments shown in FIGS. In the following embodiments and reference examples , parts having the same configuration as those of the conventional apparatus shown in FIGS. 11 to 14 are denoted by the same reference numerals for the sake of simplicity.
[0019]
( Reference example )
First, the pulverized coal separator device according to the reference example shown in FIGS. 1 and 2 will be described. 1 and 2, reference numeral 08 denotes a current plate. The ribbon screw 04 arranged inside the pulverized coal pipe 01 has a twist angle larger than that of the conventional one shown in FIG. 11, and the pulverized coal pipe from the horizontal plane to the end of the vertical plane is reached. The axial length at 01 is shortened.
[0020]
A rectifying plate 08 having the same shape as the end of the ribbon screw 04 is arranged on the downstream side of the shortened ribbon screw 04 up to the end of the pulverized coal pipe 01 (inlet of the pulverized coal nozzle 05). .
[0021]
The installation length (L) of the current plate 08 is preferably L = 0.3H to 0.8H with respect to the height (H) of the pulverized coal pipe 01, but L = 0.6H is preferable. I understood. Other configurations of the pulverized coal separator shown in FIGS. 1 and 2 are the same as those shown in FIGS. 11 to 14, and the description thereof is omitted.
[0022]
In this reference example , as described above, the ribbon screw is twisted in a section shorter than the conventional one. However, even if the ribbon screw 04 is converged in a short section to some extent, the effect is obtained. There is no decline. Then, the pulverized coal mixture 03 that flows along the ribbon screw 04 and is separated into left and right in the pulverized coal pipe 01 is led to the rectifying plate 08 and reaches the pulverized coal nozzle 05 through a fixed running section.
[0023]
Due to the effect of the rectifying plate 08, the pulverized coal mixture 03 exiting the ribbon screw 04 is relaxed in the swirling flow and reaches the pulverized coal nozzle 05 in a properly rectified state. By this effect, the re-dispersion of the pulverized coal mixture 03 subjected to concentration separation is eliminated, and the target performance can be achieved.
[0024]
(First Embodiment)
Next, the pulverized coal separator device according to the first embodiment shown in FIGS. 3 to 7 will be described. 3 to 7, reference numeral 09 denotes a density separator disposed on the downstream side of the ribbon screw 04, and is fixed in the pulverized coal pipe 01 by a support 10.
[0025]
As shown in the figure, the gray scale separator 09 has a plane 09-1 extending in a cross-sectional shape in the flow direction, a subsequent horizontal plane 09-2, and a bottom plane 09-3 perpendicular to the horizontal axis. And has a hollow notch slit 09-4 at the center of the horizontal axis. Further, the shape is wide in the pulverized coal pipe 01 and narrow in the height direction. The ribbon screw 04 is twisted in a short section in the axial direction of the pulverized coal pipe 01 as in the case of the reference example . Other configurations are the same as those of the reference example , and the description thereof is omitted.
[0026]
In the pulverized coal separator according to the first embodiment, the size of each part of the density separator 09 is θ = 60 ° to 90 ° (preferably 90 °), L = 0. 4 to 0.6H (preferably 0.5H), h1 = 0.4 to 0.6H (preferably 0.5H), W2 = W1 (2 mm to 6 mm) (preferably, the gap is as narrow as possible) Should be selected.
[0027]
In the pulverized coal separator device according to the first embodiment configured as described above, the pulverized coal mixture 03 passing through the pulverized coal pipe 01 is separated into left and right by the action of the ribbon screw 04, and then the mixture of the pulverized coal Each collide with the density separator 09, and the pulverized coal is given an inertial force and gathers on the upper and lower inner peripheral surfaces of the pulverized coal pipe 01.
[0028]
Therefore, the pulverized coal concentration is high on the inner peripheral surface (upper and lower) in the pulverized coal pipe 01, and the pulverized coal concentration is lower on the center side. That is, light and shade separation is further formed on the left and right sides of the pulverized coal nozzle 05 starting from the axial center. Further, a part of the pulverized coal mixture 03 is guided by the hollow notch slit 09-4 to eliminate stagnation due to eddy currents that are likely to occur on the bottom surface 09-3 of the density separator.
[0029]
With this action, the conventional conch flame forms a super conch flame having a higher pulverized coal concentration and a thin conch flame having a pulverized coal concentration, and the conventional weak flame forms a slightly weak and very weak weak flame. While reducing the adhesion of ash to the heat transfer tube on the wall of the combustion furnace by the above action, the ignition flame holding property can be further improved and the amount of NOx generated can be reduced.
[0030]
( Second Embodiment)
Next, the pulverized coal separator device according to the second embodiment shown in FIGS. 8 to 10 will be described. In these drawings, reference numeral 09 denotes a density separator disposed on the downstream side of the ribbon screw 04, and is fixed in the pulverized coal pipe 01 by a support 10.
[0031]
Unlike the one in the first embodiment, the density separator 09 is arranged so as to be wide in the vertical (up and down) direction and narrow in the horizontal (left and right) direction. For this reason, the pulverized coal mixture 03 distributes the pulverized coal left and right by the density separator 09. Other configurations are substantially the same as those of the first embodiment.
[0032]
In the pulverized coal separator device according to the second embodiment, the pulverized coal mixture 03 obtained by separating the density from right and left by the action of the ribbon screw 04 is placed on the inner peripheral surface (left, right) of the pulverized coal pipe 01 by the concentration separator 09. It is separated and guided to the pulverized coal nozzle 05 to form a higher concentration conc flame and a higher concentration light weak flame.
[0034]
[ Effect of the invention ]
As described above, the pulverized coal separator device according to the present invention includes a ribbon screw that is twisted from a horizontal or a certain angle to a vertical position along a flow, and a pulverized coal mixture that is separated to the left and right by the ribbon screw. Each of the above is arranged in a pulverized coal pipe with a horizontally long concentration separator that raises the pulverized coal concentration at the top and bottom, and the concentration separator is provided with a hollow notch slit that opens from upstream to downstream in the center, According to this, since the pulverized coal concentration in the upper and lower sides is increased in each of the pulverized coal mixtures separated into the left and right, the pulverized coal mixed airflow with excellent ignition flame holding property provided with the desired concentration separation In that case, the density separator eliminates the stagnation caused by the vortex that tends to occur at the bottom of the density separator by the hollow notch slit that opens from the upstream to the downstream provided in the center. .
[0035]
Furthermore, the pulverized coal separator device according to the present invention further includes a ribbon screw that is twisted from a horizontal or a certain angle to a vertical position along a flow, and a pulverized coal mixture that is separated to the left and right by the ribbon screw. A vertically long shade separator that separates the shades on the left and right is placed in the pulverized coal pipe, and the shade separator is provided with a hollow notch slit that opens from upstream to downstream in the center. shading is formed further in the lateral direction in each of the formed shading pulverized coal mixture in a good pulverized coal mixture with the ignition flame stability is expected exactly shading separated is formed, moreover this time, shading separator a hollow notch slits opening from the upstream provided at the center portion to the downstream, it eliminates the stagnation by easily vortex generated on the bottom of the shade separator.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a pulverized coal separator device according to a reference example of the present invention.
2 is a cross-sectional view showing an arrangement state of current plates in the pulverized coal separator device shown in FIG. 1;
FIG. 3 is a horizontal sectional view of the pulverized coal separator device according to the first embodiment of the present invention.
4 is a cross-sectional view taken along line IV-IV in FIG.
5 is a cross-sectional view taken along line VV in FIG.
6 is a cross-sectional view showing the size and shape of a density separator in the pulverized coal separator device shown in FIG. 4;
7 is a sectional view taken along line VII-VII in FIG.
FIG. 8 is a sectional view of a pulverized coal separator device according to a second embodiment of the present invention.
9 is a sectional view taken along line IX-IX in FIG.
10 is a cross-sectional view taken along line XX in FIG.
FIG. 11 is a sectional view showing an example of a conventional pulverized coal separator device.
12 is a sectional view taken along line XII-XII in FIG.
13 is a sectional view taken along line XIII-XIII in FIG.
14 is a sectional view taken along line XIV-XIV in FIG.
[Explanation of symbols]
01 Pulverized Coal Pipe 02 Kicker Block 03 Pulverized Coal Mixture 04 Ribbon Screw 05 Pulverized Coal Nozzle 06 Secondary Air Nozzle 07 Secondary Air 07C Concentric Secondary Air 07W Week Secondary Air 08 Rectification Plate 09 Concentration Separator 09-1 Spreading surface 09-2 Horizontal surface 09-3 Bottom surface 09-4 Hollow notch slit 10 Strut

Claims (2)

微粉炭と空気の混合気をバーナに導く微粉炭管内に設置され、同微粉炭混合気の濃淡分離を行う微粉炭セパレータ装置において、水平又は或る角度から流れに沿って鉛直位置までひねりを加えたリボンスクリュウと、同リボンスクリュウによって左右に分離された濃淡微粉炭混合気のそれぞれを上下での微粉炭濃度を高くする横長の濃淡分離器とを配置し、同濃淡分離器は中央部に上流から下流に開通する中空切欠きスリットを設けたことを特徴とする微粉炭セパレータ装置。  In a pulverized coal separator that is installed in a pulverized coal pipe that guides a mixture of pulverized coal and air to a burner, and separates the density of the pulverized coal mixture, a twist is applied from the horizontal or a certain angle to the vertical position along the flow. A horizontal strip separator that increases the pulverized coal concentration at the top and bottom of each mixture of dark and pulverized coal separated from the left and right by the ribbon screw. A pulverized coal separator device, characterized in that a hollow notch slit that opens downstream is provided. 微粉炭と空気の混合気をバーナに導く微粉炭管内に設置され、同微粉炭混合気の濃淡分離を行う微粉炭セパレータ装置において、水平又は或る角度から流れに沿って鉛直位置までひねりを加えたリボンスクリュウと、同リボンスクリュウによって左右に分離された濃淡微粉炭混合気のそれぞれをさらに左右に濃淡分離する縦長の濃淡分離器とを配置し、同濃淡分離器は中央部に上流から下流に開通する中空切欠きスリットを設けたことを特徴とする微粉炭セパレータ装置。  In a pulverized coal separator that is installed in a pulverized coal pipe that guides a mixture of pulverized coal and air to a burner, and separates the density of the pulverized coal mixture, a twist is applied from the horizontal or a certain angle to the vertical position along the flow. And a vertically long density separator that further separates the density of the pulverized coal mixture separated left and right by the ribbon screw from left to right. A pulverized coal separator device provided with a hollow notch slit to be opened.
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