JP3918476B2 - Coke oven exhaust gas discharge device and black smoke discharge prevention method - Google Patents

Coke oven exhaust gas discharge device and black smoke discharge prevention method Download PDF

Info

Publication number
JP3918476B2
JP3918476B2 JP2001259760A JP2001259760A JP3918476B2 JP 3918476 B2 JP3918476 B2 JP 3918476B2 JP 2001259760 A JP2001259760 A JP 2001259760A JP 2001259760 A JP2001259760 A JP 2001259760A JP 3918476 B2 JP3918476 B2 JP 3918476B2
Authority
JP
Japan
Prior art keywords
path
dust collector
exhaust gas
coke oven
damper
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
JP2001259760A
Other languages
Japanese (ja)
Other versions
JP2003064370A (en
Inventor
慎 杉山
和夫 室本
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sumitomo Metal Industries Ltd
Original Assignee
Sumitomo Metal Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sumitomo Metal Industries Ltd filed Critical Sumitomo Metal Industries Ltd
Priority to JP2001259760A priority Critical patent/JP3918476B2/en
Publication of JP2003064370A publication Critical patent/JP2003064370A/en
Application granted granted Critical
Publication of JP3918476B2 publication Critical patent/JP3918476B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Landscapes

  • Coke Industry (AREA)

Description

【0001】
【発明の属する技術分野】
本発明は、コークス炉から排出される排ガスの黒煙を防止する装置および方法に関する。特に、集塵機を経由する排ガス経路と集塵機を経由しないで直接煙突より排出する排ガス経路の切換装置および方法に関する。
【0002】
【従来の技術】
コークス炉は、隣接する燃焼室における燃焼により炉壁を介して加熱される炭化室を多数有しており、この燃焼室からの排ガスは、各燃焼室から蓄熱室および排気弁を経て煙道から煙突に排出されている。
【0003】
炭化室に装炭された石炭は燃焼室内の燃料ガスの燃焼により、約20〜24時間かけて乾留されコークスとなる。その乾留により石炭中の揮発分は石炭ガスとなって吸引ブロワーにて炉外に導かれ、ガス精製工程で処理される。
【0004】
またコークス炉の燃焼室における燃料ガスの制御は燃焼用空気とともに、排ガス中のO2制御または排ガスのドラフト圧力制御を行い、不完全燃焼を常に最小限に抑える制御がなされている。
【0005】
しかしながらコークス炉の炭化室と燃焼室の炉壁は珪石煉瓦で構築されており、多数の煉瓦目地が存在している。このようなコークス炉は老朽化に伴い炉壁に目地切れが生じ、前記排ガス中に炭化室から石炭ガスが流れ出し、排ガスと混ざり煙道から煙突に排出される。
【0006】
すなわち燃焼室内に流れ出した石炭ガスが燃焼室内において不完全燃焼することにより排ガスが煙突から黒煙化し排出されることとなる。
このような黒煙の排出は公害等の環境問題となり当然ながら対策が必要となる。従来この対策として、煙突にいたる煙道部に電気集塵機やバグフィルターを設置し、発生した黒煙を除去する方法が実施されている。
【0007】
しかしながら、集塵機の保守の間は集塵機を経由させずに一時的に排ガスを直接煙突から排出する経路に切り換えることが必要となる。
特開2000−265171号公報の開示する発明では、コークス炉の煙突までの排ガス経路を、集塵機への経路またはバイパスする経路に切り換える際に、あらかじめコークス炉の燃焼室への燃料ガス供給を低流量にしてから排ガス経路の切換を行う方法が提案されている。
【0008】
またコークス炉の燃焼室からの排ガスを極力少なく集塵し、設備費用および電力代等の運転経費を少なくする方法として、特開昭56−104992号公報では多数の燃焼室の排ガス経路に集塵機の経路を連結し、燃焼室内に石炭ガスの流れ出しの最も多い時間帯である、炭化室への石炭装炭直後を集中的に集塵する方法が、また、特開平6−63334 号公報では多数の燃焼室の排ガス経路に煤塵濃度計を設置し黒煙の検知時に集塵する方法が、それぞれ提案されている。
【0009】
【発明が解決しようとする課題】
集塵機の保守の間は集塵機を経由させずに一時的に排ガスを直接煙突から排出する経路に切り換える方法について、前述の特開2000−265171号公報では、切換時のダンパー操作において煙突へのドラフト圧力が急激に低下し、その結果、燃焼室へ供給される空気量が不足し不完全燃焼が生じ煙突から黒煙が発生することを指摘した上で、それを防止する方法として、あらかじめコークス炉の燃焼室に供給する燃料ガス供給を低流量にする方法を提案している。
【0010】
しかしながら、本提案ではコークス炉の燃焼室に供給される燃料ガス供給量を低下させることでコークス炉の温度低下が生じる。この温度低下は、乾留中の石炭への影響、すなわちコークス品質の悪化、さらには炉壁煉瓦が収縮し、黒煙発生の原因である煉瓦目地切れの増加等、様々な悪影響をまねくこととなる。したがって、このような温度変化を生ずる燃料ガスの流量変化は極力さけるべきである。
【0011】
集塵する排ガス量を極力少なくし設備費用、運転経費等を極力少なくする方法について、前述の特開昭56−104992号公報および特開平6−63334 号公報で開示する発明では、多数の燃焼室からの排ガス経路に集塵機の経路を連結し、黒煙を発生している燃焼室からの排ガスのみを選択的に集塵機の経路に流す方法が提案されている。
【0012】
上記提案の方法は、コークス炉の多数ある燃焼室からの排ガスを全て集合して集塵する方法にくらべ、処理する排ガス量が少なくなり、設備費用、運転経費からの面からは明らかに有利な方法である。しかしながら、燃焼室からの排ガスを集塵機側に吸引するためのダクト、および切換ダンパーの数は必然的に多くなり、炭化室数(燃焼室数)が多いコークス炉においては必ずしも有利ではなくなる。加えてコークス炉の老朽化が進むにつれ、黒煙の発生する燃焼室が石炭装入直後等の一定の時間帯とは限らず、常時、黒煙が発生してきた場合、集塵機の経路で処理する排ガス量が増加し、当初の考えていた集塵機の処理能力では対応しきれなくなる恐れがある。
【0013】
ここに、本発明の課題は、上記排ガス経路の切換時のコークス炉の操業条件の変動を防止することを可能とし、かつ、運転経費の抑制を可能とする方法および装置を提供することである。
【0014】
【課題を解決するための手段】
本発明者らは、かかる課題を解決すべく種々検討を重ね、コークス炉全体の運転状況を制御するための第一ダンパーと、下流の集塵機ダンパーおよび煙突遮断弁装置とを連動させることで、コークス炉の燃焼室における燃焼に実質上の影響を与えるおそれがなく、集塵機経由の排ガス排出経路への切り換えを容易に行いうることを知り、本発明を完成した。
【0015】
ここに本発明は次の通りである。
(1) コークス炉からの排ガスが合流する単一の排ガス経路であって煙突等の排放出端に至るコークス炉の排ガス経路中に集塵機を経由する第一経路と集塵機を経由しない第二経路とを切換可能に並設したコークス炉の排ガス排出装置において、前記第一経路と第二経路との分岐点の上流側に第一ダンパー装置を設け、該分岐点と前記集塵機との間に第二ダンパー装置を設け、そして前記第二経路に遮断弁装置を設けたことを特徴とするコークス炉の排ガス排出装置。
【0016】
(2) コークス炉からの排ガスが合流する単一の排ガス経路であって煙突等の排ガス放出端に至るコークス炉の排ガス経路中に集塵機を経由する第一経路と集塵機を経由しない第二経路とを切換可能に並設したコークス炉の排ガス排出装置による黒煙排出防止方法であって、前記第一、第二経路の分岐点と前記集塵機との間に設けた第二ダンパー装置および前記第二経路に設けた遮断弁装置を交互にそれぞれ開閉する際に、前記第一経路と第二経路との前記分岐点の上流側に設けた第一ダンパー装置の開度を調整することで、コークス炉の燃焼制御に実質上影響を与えることなく、前記第一、第二経路の切換を可能としたことを特徴とする黒煙排出防止方法。
【0017】
(3) 前記第一ダンパー装置の入側および出側のドラフト圧の変動をなるべく少とするように、第一、第二ダンパー装置および遮断弁装置の調整を行うことを特徴とする請求項2記載の黒煙排出防止方法。
【0018】
(4) 排ガスの排出を、コークス炉の操業中は集塵機を経由する第一経路に、操業中以外は集塵機を経由しない第二経路に切り換える請求項2記載の黒煙排出防止方法。
【0019】
このように、本発明によれば、集塵機を経由して排ガスを煙突から排出する経路と、集塵機を経由せず直接煙突から排出する経路とを切り換える場合において、コークス炉の燃焼室の燃焼制御には影響を与えないようにダンパー制御を実施し、加えてこの制御をコークス炉の操業タイミングの制御にも応用することを可能にできる。
【0020】
【発明の実施の形態】
次に、添付図面を参照して、本発明の実施の形態についてさらに具体的に説明する。
【0021】
図1は、本発明にかかる排ガスの排出装置の全体的模式図である。本例ではコークス炉全体からの排ガスは単一の排ガス経路を経由して排出される。集塵機の能力に応じていくつかにブロック化してそれぞれに排ガス経路、集塵機を設けるようにしてもよい。
【0022】
コークス炉の排ガス経路において、図1に示すように、コークス炉17の燃焼室16には、燃料ガス12と燃焼空気13が供給され、燃料ガス12は燃料制御弁14で供給量を調整し、燃焼空気等の流量は、圧力計8(またはO2計)により第一ダンパー装置、つまり煙道ダンパー1 (以下、煙道ダンパーという) を制御し調整を行っている。15は炭化室である。
【0023】
燃焼室16に供給された燃料ガス12と燃焼空気13は燃焼室16で燃焼後、排ガス11となり、煙道4a 、4b 、4c または4d を経て煙突7から大気放出される。すなわち、排ガス11の排出経路は、第二ダンパー装置、つまり集塵機ダンパー2 (以下、集塵機ダンパーという) および集塵機5を介し集塵機ブロワー6で吸引され煙突7にいく経路、すなわち第一経路と、同じく煙道ダンパー1を介し煙突7に行く経路、すなわち第二経路とに分けられており、保守点検等で集塵機5を停止する際はこの2つの経路の切換を行う。
【0024】
煙道ダンパーはこの第一経路と第二経路との分岐点より上流側に設けられる。集塵機5を介し排ガス11を処理する場合には、遮断弁装置、つまり煙突遮断弁3 (以下、煙突遮断弁という) を全閉にし集塵機ダンパーを開いた状態で運転を行い、煙道ダンパーの下流側、煙道4b のドラフト圧は圧力計9で所定のドラフトになるように集塵機ダンパーで制御し、さらに煙道ダンパーの上流側のドラフト圧の制御は圧力計8から得られる煙道4a の圧力の測定値にもとづいて煙道ダンパー1の開度を制御することで一定に制御を行う。
【0025】
一方、このような状態から集塵機5を保守点検のため排ガス経路を切換える際には、まず煙突遮断弁3を徐々に開けていく。煙突遮断弁3が開くと、排ガスの経路は集塵機5側の経路と煙突遮断弁3側の経路の2つの経路に流れることとなる。この時コークス炉の煙道4b のドラフト圧は2つの経路が開くことにより変動することとなるが、この煙道4b のドラフト圧は、集塵機ダンパーが閉方向に制御されることにより一定に制御され、さらに微少なドラフト圧変動は煙道ダンパーで制御される。つまり煙道4a のドラフト圧を可及的一定になるように制御する。その後、集塵機ダンパーを閉方向にして行き集塵機ブロワー6を停止させることによって切換が完了することとなる。
【0026】
したがって、上記切換操作中は、コークス炉17の燃焼制御にはいっさい影響なく切換が可能となる。
ここに、再び、反対に集塵機5の経路に戻す際には、集塵機5を集塵機ブロワー6とともに稼働し、集塵機ダンパー2を開にし、煙突遮断弁3の側の排ガス経路との2つの経路に排ガス11を流す。この時にもコークス炉の燃焼室のドラフト圧は2つの経路が開くことにより変動することとなるが、前記と同様な制御が行えるため、コークス炉17の燃焼室のドラフト圧は一定に保持される。
【0027】
その後、煙突遮断弁3を徐々に閉めていき集塵機側の排ガス経路の1方向だけへ排ガスを流していく。
本発明による上記切換方法は、コークス炉の燃焼室におけるドラフト圧の変動を伴わないことから、燃焼室における燃焼制御に一切影響を与えることはなく、従ってこの切換方法は以下のような応用にも活用可能となる。
【0028】
一般的にコークス炉の操業は、決められた時間に操業(コークスの排出および石炭装入)を実施し、操業が終了すれば操業停止となる時間(以下、" 間断時間" という)の繰り返しでおこなう。
【0029】
この間断時間中は、コークス炉の炭化室15への石炭装入作業がないことから、燃焼室16の排ガス中に炭化室15から石炭ガスが流れ出す可能性は極めて少ない。したがって、集塵機5を稼働させておくのは運転経費上無駄となるため、コークス炉の間断時間は前記切換操作をおこなう事により、集塵機5、集塵ブロワー6を停止させることができる。このような切換を実施することにより集塵機運転経費を抑制可能となる。
【0030】
本発明にかかる装置のこのような制御は図示しない適宜制御手段を設けて行うことで自動化が可能となる。
以下、本発明を実施例により詳細を説明する。
【0031】
【実施例】
本例では、図1の装置を使用して煙道ダンパーおよび集塵機ダンパー、さらに煙突遮断弁の操作の制御によって、コークス炉からの排ガス排出試験を行った。
【0032】
本実施例でのコークス炉は、炭化室数46門、燃焼室数47列の炉であり、燃料ガスは1080kcal/Nm3の高炉ガスおよび、石炭ガスを混合したMix ガスを使用し、燃焼後の排ガス量は約2000m3/min(at200 ℃)である。
【0033】
通常、上記燃料ガスを完全燃焼させるために、煙道のドラフト圧は煙道ダンパー1の上流側の煙道4a においては−20mmH2O (O2制御時は2%前後)で制御される。またこの時の煙道ダンパー1の下流側の煙道4b のドラフト圧は−50mmH2O である。
【0034】
このような状態において、集塵機5を運転状態から停止するとき、また、停止から運転状態にするときの各部位のドラフト力、ダンパーの状態を表1にまとめて記載した。
【0035】
まず、集塵機5が運転している状態を表1の▲1▼に記す。ドラフト圧は煙道ダンパー1の上流側の煙道4a で−20mmH2O (O2制御時は2%前後)、下流側の煙道4b で−50mmH2O であり、さらに下流側の集塵機5の側の分岐点以降の経路での煙道4c では、若干のマイナス圧であるものの、ほぼ±0mmH2O である。
【0036】
次に、集塵機5の運転を停止する場合には、まず煙突遮断弁3を開け煙突側の排ガス経路につなぐ(表1の▲2▼)。この時の煙突のドラフト圧は大気温度にもよるが、通常−30mmH2O であり煙道4b でのドラフト圧−50mmH2O よりも低くなるため、集塵機ダンパーは−50mmH2O に制御しようとダンパー開度を40%から50%に開けることにより、煙道4a のドラフト圧−20mmH2O (O2制御時は2%前後)は維持される。
【0037】
集塵機5の停止時は集塵機ブロワー6を停止させ、それにともない集塵機ダンパーを全閉にする(表1の▲3▼)。煙道4b のドラフトは集塵機5の停止にともない煙道4c 側のドラフト、すなわち−50mmH2O から−30mmH2O に低下していく。この圧力低下は煙道ダンパーが40%から50%に開くことにより、煙道4a のドラフト−20mmH2O (O2制御時は2%前後)は維持される。
【0038】
集塵機5を停止状態から運転状態に立ち上げる際には、集塵機ブロワー6を運転し集塵機ダンパーを全閉状態から徐々に開いていく(表1の▲4▼)。
集塵機ダンパーは煙道4b のドラフト圧−50mmH2O にすべく開度50%に開くため、煙道ダンパーの開度は50%から40%に閉まる。この状態から集塵機5の側の排ガス経路に切り換えるために、煙突遮断弁3を全閉の状態にしていくと(表1の▲5▼)、煙道4c のドラフトは低下し±0mmH2O の状態になり集塵機ダンパーは50%から40%となり集塵機の運転状態となる。
【0039】
当然のことであるが、集塵機5を停止状態から運転状態に立ち上げる際にも煙道4a のドラフト圧は−20mmH2O (O2制御時は2%前後)は維持され、コークス炉の燃焼制御には何ら影響を与えずに切換が可能である。
【0040】
【表1】

Figure 0003918476
【0041】
次に、集塵機5の運転パターンを図2に記載する。コークス炉の操業は炭化室数が46門の場合は46門を5ブロックに分けて操業時間帯を割り当てるのが一般的である。石炭装入からコークスに乾留する時間を24時間とした場合、各炭化室は24時間に1回の頻度でコークスを乾留することになり、その操業時間ピッチは約4.8 時間(24時間÷5)となる。
【0042】
この4.8 時間のうちコークス排出、石炭装入にかかわる操業時間帯は約72分(1門の操業時間8分、1 ブロック9門)であり、4.8 時間から72分を引いた残り時間が間断時間であり、実に75%は間断時間となる。
【0043】
この間断時間帯のコークス炉排ガス中の煤塵濃度を、図1の煤塵濃度計10で計測した結果を図2の時間経過に合わせて図3に記載する。燃焼室排ガス中に流入する石炭ガスは、石炭装入直後の石炭ガスの発生が最も多い時間帯に多く、煤塵濃度もそのタイミングにピークとなり、操業時間帯は殆ど煤塵が発生する状態にある。
【0044】
しかしながら、間断時間帯は煤塵濃度の発生は殆どなく、集塵機5を運転する必要がなく運転をすることで運転経費が無駄となるのみである。
したがって、この間断時間帯は先述した方法で、コークス炉の燃焼制御に影響を与えることなく簡単に切換が可能となり、集塵機5を停止できる。
【0045】
また、操業開始時間はあらかじめ判っていることから、操業開始直前に集塵機5を運転しておけば何ら問題はない。
【0046】
【発明の効果】
本発明によって、コークス炉の燃焼制御に影響を与えることなく、排ガス経路の切換が可能となり、黒煙が発生しない時間帯は集塵機を停止でき、運転経費の抑制をすることが可能となる。
【図面の簡単な説明】
【図1】本発明のコークス炉排ガス経路と集塵機の経路を説明するフロー図である。
【図2】コークス炉の操業パターンとそれに伴う集塵機の運転パターンの説明図である。
【図3】図2のコークス炉操業パターンに伴う、煤塵濃度の発生挙動の説明図である。
【符号の説明】
1:第一ダンパー装置 (煙道ダンパー)
2:第二ダンパー装置 (集塵機ダンパー)
3:遮断弁装置 (煙突遮断弁)
4a,4b,4c : 煙道
5:集塵機
6:集塵機ブロワー
7:煙突
8:圧力計(O2濃度計)
9:圧力計
10:煤塵濃度計
11:排ガス
12:燃料ガス
13:燃焼空気
14:燃料制御弁
15:炭化室
16:燃焼室
17:コークス炉[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an apparatus and method for preventing black smoke in exhaust gas discharged from a coke oven. In particular, the present invention relates to an apparatus and a method for switching between an exhaust gas route passing through a dust collector and an exhaust gas route discharging directly from a chimney without going through the dust collector.
[0002]
[Prior art]
The coke oven has a large number of carbonization chambers that are heated through the furnace wall by combustion in the adjacent combustion chambers, and the exhaust gas from the combustion chambers passes through the heat storage chambers and exhaust valves from the flue through each combustion chamber. It is discharged into the chimney.
[0003]
Coal loaded in the carbonization chamber is carbonized into coke over about 20 to 24 hours by combustion of fuel gas in the combustion chamber. Due to the dry distillation, the volatile matter in the coal becomes coal gas and is led out of the furnace by a suction blower and processed in the gas purification process.
[0004]
Control of the fuel gas in the combustion chamber of the coke oven is carried out by controlling the O 2 in the exhaust gas or the draft pressure of the exhaust gas together with the combustion air to always minimize incomplete combustion.
[0005]
However, the carbonization chamber of the coke oven and the furnace wall of the combustion chamber are constructed of quartz brick, and there are many brick joints. In such a coke oven, the wall of the furnace is cut off due to aging, coal gas flows out from the carbonization chamber into the exhaust gas, is mixed with the exhaust gas, and is discharged from the flue to the chimney.
[0006]
That is, the coal gas that has flowed into the combustion chamber burns incompletely in the combustion chamber, so that the exhaust gas is turned into black smoke from the chimney and discharged.
Such emission of black smoke becomes an environmental problem such as pollution, and of course it is necessary to take countermeasures. Conventionally, as a countermeasure, an electric dust collector and a bag filter are installed in a flue portion leading to a chimney to remove the generated black smoke.
[0007]
However, during maintenance of the dust collector, it is necessary to temporarily switch to a route for exhaust gas exhausting directly from the chimney without going through the dust collector.
In the invention disclosed in Japanese Patent Application Laid-Open No. 2000-265171, when the exhaust gas path to the chimney of the coke oven is switched to a path to the dust collector or a bypass path, the fuel gas supply to the combustion chamber of the coke oven is reduced at a low flow rate in advance. Then, a method for switching the exhaust gas path has been proposed.
[0008]
As a method for collecting the exhaust gas from the combustion chamber of the coke oven as much as possible and reducing the operating cost such as the equipment cost and the electric power cost, Japanese Patent Laid-Open No. 56-104992 discloses the dust collectors in the exhaust gas paths of many combustion chambers. A method of intensive dust collection immediately after coal coal charging to the carbonization chamber, which is the time zone in which the coal gas flows most frequently into the combustion chamber, is disclosed in JP-A-6-63334. Methods have been proposed for collecting dust when a smoke concentration meter is installed in the exhaust gas path of the combustion chamber to detect black smoke.
[0009]
[Problems to be solved by the invention]
Regarding the method of temporarily switching to a path for exhaust gas to be directly discharged from the chimney without going through the dust collector during maintenance of the dust collector, the aforementioned Japanese Patent Laid-Open No. 2000-265171 describes the draft pressure to the chimney in the damper operation at the time of switching. As a method to prevent this, it was pointed out that the amount of air supplied to the combustion chamber was insufficient, resulting in incomplete combustion and black smoke from the chimney. A method of reducing the flow rate of the fuel gas supplied to the combustion chamber has been proposed.
[0010]
However, in this proposal, the temperature of the coke oven is lowered by reducing the amount of fuel gas supplied to the combustion chamber of the coke oven. This temperature decrease will cause various adverse effects such as the effect on coal during dry distillation, that is, the deterioration of coke quality, and further the shrinkage of the furnace wall bricks and the increase of brick joints causing black smoke generation. . Therefore, a change in the flow rate of the fuel gas that causes such a temperature change should be avoided as much as possible.
[0011]
With respect to a method for reducing the amount of exhaust gas to be collected as much as possible to reduce equipment costs and operating costs as much as possible, in the inventions disclosed in the aforementioned Japanese Patent Laid-Open Nos. 56-104992 and 6-63334, a large number of combustion chambers are used. A method has been proposed in which the dust collector path is connected to the exhaust gas path from the exhaust gas, and only the exhaust gas from the combustion chamber generating black smoke is selectively passed to the dust collector path.
[0012]
Compared with the method that collects and collects all the exhaust gas from the many combustion chambers of the coke oven, the proposed method requires less exhaust gas to be processed and is clearly advantageous in terms of equipment and operating costs. Is the method. However, the number of ducts and switching dampers for sucking exhaust gas from the combustion chamber to the dust collector side inevitably increases, and this is not necessarily advantageous in a coke oven having a large number of carbonization chambers (combustion chambers). In addition, as the coke oven ages, the combustion chamber where black smoke is generated is not limited to a certain period of time, such as immediately after charging coal. As the amount of exhaust gas increases, the processing capacity of the dust collector originally considered may not be able to cope with it.
[0013]
Here, an object of the present invention is to provide a method and an apparatus that can prevent fluctuations in the operating conditions of the coke oven at the time of switching the exhaust gas path and that can reduce operating costs. .
[0014]
[Means for Solving the Problems]
The present inventors have made various studies in order to solve such problems, and by coordinating the first damper for controlling the operation status of the entire coke oven with the downstream dust collector damper and the chimney shut-off valve device, The present invention has been completed by knowing that there is no risk of substantially affecting the combustion in the combustion chamber of the furnace and that it can be easily switched to the exhaust gas discharge path via the dust collector.
[0015]
Here, the present invention is as follows.
(1) A single exhaust gas path where exhaust gas from the coke oven joins, and a first path that passes through the dust collector and a second path that does not pass through the dust collector in the exhaust gas path of the coke oven leading to the exhaust discharge end of a chimney or the like In the coke oven exhaust gas discharge device, wherein a first damper device is provided upstream of a branch point between the first path and the second path, and a second damper device is provided between the branch point and the dust collector. A coke oven exhaust gas discharge device characterized in that a damper device is provided and a shut-off valve device is provided in the second path.
[0016]
(2) A single exhaust gas path where exhaust gas from the coke oven joins, and a first path that passes through the dust collector and a second path that does not pass through the dust collector in the exhaust gas path of the coke oven leading to the exhaust gas discharge end such as a chimney A method for preventing black smoke emission by a coke oven exhaust gas discharge device arranged side by side, wherein the second damper device and the second damper device are provided between the branch point of the first and second paths and the dust collector. When the shut-off valve devices provided on the path are alternately opened and closed, the coke oven is adjusted by adjusting the opening degree of the first damper device provided on the upstream side of the branch point between the first path and the second path. A black smoke emission preventing method characterized in that the first and second paths can be switched without substantially affecting the combustion control.
[0017]
(3) The first and second damper devices and the shut-off valve device are adjusted so as to minimize fluctuations in the draft pressure on the inlet side and the outlet side of the first damper device. The black smoke emission prevention method described.
[0018]
(4) The black smoke emission prevention method according to claim 2, wherein the exhaust gas emission is switched to the first path that passes through the dust collector during operation of the coke oven, and to the second path that does not pass through the dust collector during operation.
[0019]
Thus, according to the present invention, when switching between a path for exhaust gas exhausted from the chimney via the dust collector and a path for exhaust gas exhausted directly from the chimney without going through the dust collector, the combustion control of the combustion chamber of the coke oven is performed. The damper control is carried out so as not to affect, and in addition, this control can be applied to the control of the operation timing of the coke oven.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described more specifically with reference to the accompanying drawings.
[0021]
FIG. 1 is an overall schematic view of an exhaust gas exhaust apparatus according to the present invention. In this example, the exhaust gas from the entire coke oven is discharged via a single exhaust gas path. Depending on the capacity of the dust collector, it may be divided into several blocks and provided with an exhaust gas path and a dust collector, respectively.
[0022]
In the exhaust gas path of the coke oven, as shown in FIG. 1, the fuel gas 12 and the combustion air 13 are supplied to the combustion chamber 16 of the coke oven 17, and the supply amount of the fuel gas 12 is adjusted by the fuel control valve 14. The flow rate of the combustion air or the like is adjusted by controlling the first damper device, that is, the flue damper 1 (hereinafter referred to as the flue damper) by the pressure gauge 8 (or O 2 meter). 15 is a carbonization chamber.
[0023]
The fuel gas 12 and the combustion air 13 supplied to the combustion chamber 16 become exhaust gas 11 after combustion in the combustion chamber 16, and are discharged from the chimney 7 through the flue 4a, 4b, 4c or 4d. That is, the exhaust gas 11 is discharged through the second damper device, that is, the dust collector damper 2 (hereinafter referred to as the dust collector damper) and the dust collector 5 and sucked by the dust collector blower 6 to the chimney 7, that is, the first route. The route is divided into a route to the chimney 7 via the road damper 1, that is, a second route. When the dust collector 5 is stopped for maintenance inspection or the like, the two routes are switched.
[0024]
The flue damper is provided upstream of the branch point between the first path and the second path. When the exhaust gas 11 is processed through the dust collector 5, the operation is performed with the shut-off valve device, that is, the chimney shut-off valve 3 (hereinafter referred to as the chimney shut-off valve) fully closed and the dust collector damper opened, and downstream of the flue damper. The draft pressure of the flue 4b is controlled by a dust collector damper so that a predetermined draft is obtained by the pressure gauge 9, and the draft pressure upstream of the flue damper is controlled by the pressure of the flue 4a obtained from the pressure gauge 8. By controlling the opening degree of the flue damper 1 based on the measured value, the control is performed constantly.
[0025]
On the other hand, when the exhaust gas path is switched for maintenance inspection of the dust collector 5 from such a state, the chimney shut-off valve 3 is first gradually opened. When the chimney shut-off valve 3 is opened, the path of the exhaust gas flows into two paths, a path on the dust collector 5 side and a path on the chimney shut-off valve 3 side. At this time, the draft pressure of the coke oven flue 4b fluctuates due to the opening of the two paths, but the draft pressure of the flue 4b is controlled to be constant by controlling the dust collector damper in the closing direction. The draft pressure fluctuation is controlled by the flue damper. That is, the draft pressure of the flue 4a is controlled to be as constant as possible. Thereafter, the dust collector damper is closed and the dust collector blower 6 is stopped to complete the switching.
[0026]
Therefore, during the switching operation, the combustion control of the coke oven 17 can be switched without any influence.
Here, when returning to the path of the dust collector 5 again, the dust collector 5 is operated together with the dust collector blower 6, the dust collector damper 2 is opened, and the exhaust gas is exhausted into two paths including the exhaust path on the chimney shut-off valve 3 side. Run 11 At this time, the draft pressure in the combustion chamber of the coke oven fluctuates due to the opening of the two paths. However, since the same control as described above can be performed, the draft pressure in the combustion chamber of the coke oven 17 is kept constant. .
[0027]
Thereafter, the chimney shut-off valve 3 is gradually closed, and the exhaust gas flows in only one direction of the exhaust gas path on the dust collector side.
Since the above switching method according to the present invention is not accompanied by fluctuations in the draft pressure in the combustion chamber of the coke oven, it does not affect the combustion control in the combustion chamber at all. Therefore, this switching method is also applicable to the following applications. Can be used.
[0028]
In general, coke oven operation is performed by repeating the operation (coke discharge and coal charging) at a predetermined time, and when the operation is completed, the operation is stopped (hereinafter referred to as “interruption time”). Do it.
[0029]
During this intermittent period, there is no coal charging operation into the coking chamber 15 of the coke oven, so there is very little possibility of coal gas flowing out of the coking chamber 15 into the exhaust gas of the combustion chamber 16. Therefore, since operating the dust collector 5 is wasted in terms of operating costs, the dust collector 5 and the dust collector blower 6 can be stopped by performing the switching operation during the intermittent time of the coke oven. By carrying out such switching, it is possible to suppress the dust collector operating cost.
[0030]
Such control of the apparatus according to the present invention can be automated by providing appropriate control means (not shown).
Hereinafter, the present invention will be described in detail with reference to examples.
[0031]
【Example】
In this example, an exhaust gas emission test from a coke oven was performed by controlling the operation of a flue damper, a dust collector damper, and a chimney shut-off valve using the apparatus of FIG.
[0032]
The coke oven in this example is a furnace with 46 coking chambers and 47 rows of combustion chambers. The fuel gas is a blast furnace gas of 1080 kcal / Nm 3 and Mix gas mixed with coal gas. The amount of exhaust gas is about 2000m 3 / min (at 200 ° C).
[0033]
Usually, in order to completely burn the fuel gas, the draft pressure of the flue is controlled at −20 mmH 2 O (around 2% at the time of O 2 control) in the flue 4 a upstream of the flue damper 1. At this time, the draft pressure of the flue 4b on the downstream side of the flue damper 1 is -50 mmH 2 O.
[0034]
In such a state, when the dust collector 5 is stopped from the operation state, and when the dust collector 5 is changed from the stop state to the operation state, the draft force and the damper state of each part are collectively shown in Table 1.
[0035]
First, the state in which the dust collector 5 is operating is shown in (1) of Table 1. The draft pressure is −20 mmH 2 O in the upstream flue 4 a of the flue damper 1 (around 2% when O 2 is controlled), −50 mmH 2 O in the downstream flue 4 b, and the downstream dust collector 5. In the flue 4c in the path after the branch point on the side of the side, although it is slightly negative pressure, it is approximately ± 0 mmH 2 O.
[0036]
Next, when the operation of the dust collector 5 is stopped, the chimney shut-off valve 3 is first opened and connected to the exhaust gas path on the chimney side ((2) in Table 1). At this time, the draft pressure of the chimney depends on the atmospheric temperature, but it is usually -30mmH 2 O, which is lower than the draft pressure in the flue 4b -50mmH 2 O. Therefore, the dust collector damper will be controlled to -50mmH 2 O. By opening the damper opening from 40% to 50%, the draft pressure of the flue 4a -20mmH 2 O (around 2% when O 2 is controlled) is maintained.
[0037]
When the dust collector 5 is stopped, the dust collector blower 6 is stopped, and accordingly, the dust collector damper is fully closed ((3) in Table 1). As the dust collector 5 stops, the draft of the flue 4b decreases to the draft of the flue 4c, that is, from −50 mmH 2 O to −30 mmH 2 O. This pressure drop maintains the draft -20mmH 2 O (around 2% when O 2 is controlled) of the flue 4a by opening the flue damper from 40% to 50%.
[0038]
When starting up the dust collector 5 from the stopped state to the operating state, the dust collector blower 6 is operated to gradually open the dust collector damper from the fully closed state ((4) in Table 1).
Since the dust collector damper opens to 50% opening to make the draft pressure of the flue 4b -50mmH 2 O, the opening of the flue damper is closed from 50% to 40%. In order to switch from this state to the exhaust gas path on the dust collector 5 side, when the chimney shut-off valve 3 is fully closed ((5) in Table 1), the draft of the flue 4c is reduced to ± 0 mmH 2 O. The dust collector damper becomes 50% to 40%, and the dust collector is in operation.
[0039]
Naturally, even when the dust collector 5 is started up from the stopped state, the draft pressure of the flue 4a is maintained at −20 mmH 2 O (around 2% at the time of O 2 control), and the combustion of the coke oven is performed. Switching can be performed without affecting the control.
[0040]
[Table 1]
Figure 0003918476
[0041]
Next, the operation pattern of the dust collector 5 is shown in FIG. In the operation of coke ovens, when there are 46 coking chambers, it is common to divide 46 gates into 5 blocks and allocate the operation time zone. If the time for carbonization from coal charging to coke is 24 hours, each carbonization chamber will carbonize coke once every 24 hours, and the operation time pitch is about 4.8 hours (24 hours ÷ 5). It becomes.
[0042]
Of this 4.8 hours, the operation time for coke discharge and coal charging is about 72 minutes (1 gate operation time 8 minutes, 1 block 9 gates), and the remaining time after subtracting 72 minutes from 4.8 hours In fact, 75% is the interruption time.
[0043]
The result of measuring the soot concentration in the coke oven exhaust gas during this intermittent time period with the soot concentration meter 10 in FIG. 1 is shown in FIG. 3 along with the passage of time in FIG. The coal gas flowing into the combustion chamber exhaust gas is mostly in the time zone where the generation of coal gas is the most immediately after charging the coal, the soot concentration also peaks at that timing, and soot dust is almost generated in the operation time zone.
[0044]
However, there is almost no generation of dust concentration during the intermittent time period, and it is not necessary to operate the dust collector 5, and only operating costs are wasted by operating.
Therefore, the intermittent time zone can be easily switched without affecting the combustion control of the coke oven by the method described above, and the dust collector 5 can be stopped.
[0045]
In addition, since the operation start time is known in advance, there is no problem if the dust collector 5 is operated immediately before the operation start.
[0046]
【The invention's effect】
According to the present invention, the exhaust gas path can be switched without affecting the combustion control of the coke oven, and the dust collector can be stopped during the time zone when no black smoke is generated, thereby reducing the operating cost.
[Brief description of the drawings]
FIG. 1 is a flowchart illustrating a coke oven exhaust gas path and a dust collector path according to the present invention.
FIG. 2 is an explanatory diagram of an operation pattern of a coke oven and an accompanying operation pattern of a dust collector.
FIG. 3 is an explanatory diagram of the generation behavior of the soot concentration accompanying the coke oven operation pattern of FIG. 2;
[Explanation of symbols]
1: First damper device (flue damper)
2: Second damper device (dust collector damper)
3: Shut-off valve device (chimney shut-off valve)
4a, 4b, 4c: Flue 5: Dust collector 6: Dust collector blower 7: Chimney 8: Pressure gauge (O 2 concentration meter)
9: Pressure gauge
10: Dust concentration meter
11: Exhaust gas
12: Fuel gas
13: Combustion air
14: Fuel control valve
15: Carbonization chamber
16: Combustion chamber
17: Coke oven

Claims (4)

コークス炉からの排ガスが合流する単一の排ガス経路であって煙突等の排放出端に至るコークス炉の排ガス経路中に集塵機を経由する第一経路と集塵機を経由しない第二経路とを切換可能に並設したコークス炉の排ガス排出装置において、前記第一経路と第二経路との分岐点の上流側に第一ダンパー装置を設け、該分岐点と前記集塵機との間に第二ダンパー装置を設け、そして前記第二経路に遮断弁装置を設けたことを特徴とするコークス炉の排ガス排出装置。Capable of switching and a second path not passing through the first path and dust collector through the dust collector to a single exhaust gas passage exhaust gas from the coke oven are joined in the flue gas path of the coke oven extending in the exhaust discharge end such as chimneys The first damper device is provided upstream of the branch point between the first path and the second path, and the second damper device is provided between the branch point and the dust collector. A coke oven exhaust gas discharge device, characterized in that a shut-off valve device is provided in the second path. コークス炉からの排ガスが合流する単一の排ガス経路であって煙突等の排ガス放出端に至るコークス炉の排ガス経路中に集塵機を経由する第一経路と集塵機を経由しない第二経路とを切換可能に並設したコークス炉の排ガス排出装置による黒煙排出防止方法であって、前記第一、第二経路の分岐点と前記集塵機との間に設けた第二ダンパー装置および前記第二経路に設けた遮断弁装置を交互にそれぞれ開閉する際に、前記第一経路と第二経路との前記分岐点の上流側に設けた第一ダンパー装置の開度を調整することで、コークス炉の燃焼制御に実質上影響を与えることなく、前記第一、第二経路の切換を可能としたことを特徴とする黒煙排出防止方法。Capable of switching and a second path not passing through the first path and dust collector through the dust collector to a single exhaust gas passage exhaust gas from the coke oven are joined in the flue gas path of the coke oven extending in the exhaust gas discharge end of such chimney And a second damper device provided between the branch point of the first and second paths and the dust collector. Combustion control of the coke oven by adjusting the opening degree of the first damper device provided upstream of the branch point of the first path and the second path when the open / close valve devices are alternately opened and closed. A method for preventing black smoke emission, wherein the first and second paths can be switched without substantially affecting the operation. 前記第一ダンパー装置の入側および出側のドラフト圧の変動をなるべく少とするように、第一、第二ダンパー装置および遮断弁装置の調整を行うことを特徴とする請求項2記載の黒煙排出防止方法。3. The black according to claim 2, wherein the first and second damper devices and the shutoff valve device are adjusted so as to minimize fluctuations in the draft pressure on the inlet side and the outlet side of the first damper device. Smoke emission prevention method. 排ガスの排出を、コークス炉の操業中は集塵機を経由する第一経路に、操業中以外は集塵機を経由しない第二経路に切り換える請求項2記載の黒煙排出防止方法。The black smoke emission prevention method according to claim 2, wherein exhaust gas emission is switched to a first path that passes through the dust collector during operation of the coke oven, and to a second path that does not pass through the dust collector during operation.
JP2001259760A 2001-08-29 2001-08-29 Coke oven exhaust gas discharge device and black smoke discharge prevention method Expired - Lifetime JP3918476B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2001259760A JP3918476B2 (en) 2001-08-29 2001-08-29 Coke oven exhaust gas discharge device and black smoke discharge prevention method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2001259760A JP3918476B2 (en) 2001-08-29 2001-08-29 Coke oven exhaust gas discharge device and black smoke discharge prevention method

Publications (2)

Publication Number Publication Date
JP2003064370A JP2003064370A (en) 2003-03-05
JP3918476B2 true JP3918476B2 (en) 2007-05-23

Family

ID=19087082

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2001259760A Expired - Lifetime JP3918476B2 (en) 2001-08-29 2001-08-29 Coke oven exhaust gas discharge device and black smoke discharge prevention method

Country Status (1)

Country Link
JP (1) JP3918476B2 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5487593B2 (en) * 2008-11-10 2014-05-07 新日鐵住金株式会社 Coke oven flue dust collector startup method
JP5888284B2 (en) * 2013-06-20 2016-03-16 Jfeスチール株式会社 Exhaust gas treatment apparatus and exhaust gas treatment method

Also Published As

Publication number Publication date
JP2003064370A (en) 2003-03-05

Similar Documents

Publication Publication Date Title
JP3948347B2 (en) Coke oven gas combustion control method and apparatus
KR20120096459A (en) Method and device for keeping coke furnace chambers hot when a waste heat boiler is stopped
CN104487153B (en) Exhaust gas-purifying equipment and operation control method therefor
CN108709413A (en) A method of dry coke quenching warm air is carried out using combustion gas furnace and dries baker
JP2006275502A (en) Stoker type incinerator and its operation method
JP3918476B2 (en) Coke oven exhaust gas discharge device and black smoke discharge prevention method
CN111609415A (en) Self-cleaning heat accumulating type thermal incineration device
JP3948346B2 (en) Coke oven gas combustion method
JP2594403B2 (en) Black smoke emission prevention device for coke oven
JP5501665B2 (en) Exhaust gas treatment system and boiler combustion control method
CN211921415U (en) Processing system of coke oven and dry quenching furnace diffused gas
CN111207401B (en) Heat accumulating type oxidation furnace and dirt removing and anti-blocking process
JP3991639B2 (en) Coke oven black smoke emission prevention method
JP3912115B2 (en) Coke oven gas combustion method
JP5243840B2 (en) Combustion method of stoker type incinerator
JP2565063B2 (en) Coke oven carbonization chamber pressure control method
RU2609588C1 (en) Gas outlet channel for steel making unit
CN212430893U (en) Heat accumulating type heating power incineration device not prone to blockage
CN104197733A (en) High-temperature sintering carbon device and technology of heat accumulating type circulating gas heating furnace
JP2821985B2 (en) Combustible gas combustion control method for coke dry fire extinguishing equipment
JP3103809U (en) Improved equipment for time difference charcoal kiln
JP3601578B2 (en) Method to control black smoke generation from chimney of coke oven
JP4930961B2 (en) Method and apparatus for preventing gas leakage in coke oven duct
JP2687830B2 (en) Exhaust heat recovery method in heating furnace using regenerative burner
JPH1096512A (en) Heating furnace with regenerative burner and its operating method

Legal Events

Date Code Title Description
A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20051129

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20060117

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20060314

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20070123

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20070205

R150 Certificate of patent or registration of utility model

Ref document number: 3918476

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R150

Free format text: JAPANESE INTERMEDIATE CODE: R150

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20100223

Year of fee payment: 3

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20110223

Year of fee payment: 4

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20120223

Year of fee payment: 5

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20120223

Year of fee payment: 5

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20130223

Year of fee payment: 6

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20130223

Year of fee payment: 6

S111 Request for change of ownership or part of ownership

Free format text: JAPANESE INTERMEDIATE CODE: R313111

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20130223

Year of fee payment: 6

R350 Written notification of registration of transfer

Free format text: JAPANESE INTERMEDIATE CODE: R350

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20140223

Year of fee payment: 7

S533 Written request for registration of change of name

Free format text: JAPANESE INTERMEDIATE CODE: R313533

R350 Written notification of registration of transfer

Free format text: JAPANESE INTERMEDIATE CODE: R350

EXPY Cancellation because of completion of term