JP3695300B2 - Coke oven discharge by-product processing method - Google Patents

Coke oven discharge by-product processing method Download PDF

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Publication number
JP3695300B2
JP3695300B2 JP2000276527A JP2000276527A JP3695300B2 JP 3695300 B2 JP3695300 B2 JP 3695300B2 JP 2000276527 A JP2000276527 A JP 2000276527A JP 2000276527 A JP2000276527 A JP 2000276527A JP 3695300 B2 JP3695300 B2 JP 3695300B2
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Japan
Prior art keywords
gas
riser
coke oven
products
oxygen
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JP2001164257A (en
Inventor
司 近田
豊 鈴木
英邦 伊藤
勇 南澤
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Nippon Steel Corp
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Sumitomo Metal Industries Ltd
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Description

【0001】
【発明の属する技術分野】
本発明は、高炉用コークスを製造するコークス炉に関するものであり、特にコークス炉からの副生物が大気中に放散されるのを低減するコークス炉排出副生物の処理方法に関する。
【0002】
【従来の技術】
我が国で製造されるコークスの大部分は高炉で使用されている。
コークスを製造するための室炉式コークス炉は、石炭を乾留するための炭化室とこの炭化室に熱を供給するための燃焼室とが交互にサンドイッチ状に配列された構造である。
【0003】
例えば20〜40トンの原料石炭が一度に炭化室に装入され、24時間前後の乾留時間で1000℃程度にまで焼成されてコークス炉から排出される。
コークス炉から排出された赤熱コークスは、散水による湿式冷却あるいは不活性ガスによる乾式冷却により消火、冷却され、製品コークスになる。
【0004】
この原料石炭から赤熱コークスへの転換過程において、石炭からは水素を主成分とするガスや、タールあるいはタール軽油等が同時に副生する。
図1は、副生物の回収工程を概念的に示すフロー図である。
【0005】
図示するように、天蓋4が閉じられ皿弁5が開の状態で、水素と炭化水素を主成分とするガスや、タール等の副生物は、炭化室1から上昇管2を通じて排出され、集気本管3を通して下流の精製・回収工程(図示せず)に導入される。
【0006】
すなわち、コークス炉で発生するガスやタール等の副生物は、分離精製処理されてコークス炉ガス、軽油あるいはタール等種々の製品として回収される。このために、各炭化室で発生したガス等は、先ず集気本管3に集められ、これを通じて下流の精製工程に導入される。
【0007】
この集気本管3には、例えば50〜100門程度の炭化室が接続しており、各炭化室と集気本管との間には、各炭化室との接続を開閉するための皿弁が各炭化室毎に設置されている。
【0008】
但し、乾留末期になると、皿弁5が閉じられ集気本管3と上昇管2との間が断ち切られ、代わりに上昇管2上部の天蓋4が開放される。
このように通常は、この皿弁を開として炭化室と集気本管とが連結しているが、乾留末期を含むコークスケーキ押出し時には集気本管中への空気の混入を抑止するために皿弁を閉じて炭化室と集気本管との連絡を断ち切る操作を行うのが一般的である。
【0009】
図2は、上昇管の上部の天蓋が開放された場合の副生物のフロー図である。
図示するように、皿弁5が閉じられ天蓋4が開の状態で、炭化室内にガスやタール等の副生物が残留している場合には、これらが上昇管2上部から大気中に放散される可能性を有している。
【0010】
つまり、炭化室と集気本管との連絡を断ち切る操作を行う場合には、上昇管の上部の天蓋が開放されることになり、この場合には炭化室内に残留するガス等の副生物が大気中に放散されないようにすることが肝要である。
【0011】
【発明が解決しようとする課題】
大気中に放散される副生物は、上昇管出口で空気と接触して発火・燃焼し、その大部分は燃焼生成物としてのCO2 やH2 Oに転化するので、環境上問題無い。
【0012】
しかし、燃焼条件によっては、放散される副生物の極一部が未燃のまま大気中に拡散する危険性を有している。
大気中に拡散された副生物が蓄積することは地球環境を保護する視点から好ましくなく何らかの対策が必要である。
【0013】
本発明の目的は、コークス炉からの副生物が大気中に放散されるのを低減するコークス炉排出副生物の処理方法を提供することにある。
【0014】
【課題を解決するための手段】
本発明者らは、コークス炉の上昇管から大気中に放散される副生物の低減について種々検討を行い以下の知見を得た。
【0015】
(A)未燃のまま大気中に放散している副生物の燃焼性について種々検討を行った結果、上昇管の内部に予め酸素含有ガスを添加し、放散ガスとの混合ガスを形成することにより、未燃の副生物を低減できることを見出した。
【0016】
(B)また、上昇管の内部に旋回流を起こすように酸素含有ガスを添加すると、未燃の副生物が更に低減できることを見出した。
(C)さらに、上昇管の出口上部で上昇管の中心線に向かって酸素含有ガスを添加すると、未燃の副生物を低減できることを見出した。
【0017】
上記(A)〜(C)の方法で燃焼性が改善されるのは、副生物と酸素含有ガスとの混合均一性が良好となるためと推定できる。
本発明は、以上の知見に基づいてなされたもので、その要旨は、下記のとおりである。
【0018】
(1)コークス炉の上昇管の上部から乾留副生物を大気燃焼、または、そのまま大気放散する操業時に、前記上昇管の内部に上昇管低部から酸素含有ガスを添加することを特徴とするコークス炉排出副生物の処理方法。
【0019】
(2)上昇管内に旋回流が生じるように酸素含有ガスを添加することを特徴とする上記(1)に記載のコークス炉排出副生物の処理方法。
(3)前記上昇管の出口上部で、上昇管の中心線に向かって酸素含有ガスを添加することを特徴とする上記(1)または(2)に記載のコークス炉排出副生物の処理方法。
【0020】
【発明の実施の形態】
石炭をコークス炉炭化室に装入すると、煉瓦を介した炭化室両側の燃焼室からの熱で石炭の温度が上昇する。石炭の温度が400℃程度まで上昇すると、固体の石炭は軟化・溶融状態を呈するようになる。
【0021】
同時に、ガスやタール等の揮発成分の発生が顕著となり、これらは炭化室上部の空間から上昇管を通じて集気本管に集められ、下流の分離精製工程に送られることになる。
【0022】
炭化室の幅は450mm前後であり、この幅の石炭が主として両横の燃焼室からの伝導伝熱で昇温されることになる。このような形で加熱されるため、その昇温速度は小さく、結局その中心部(炭中部)が1000℃程度にまで焼き上がるのに約一昼夜を要することになる。
【0023】
すなわち、ガスやタール等の揮発成分の発生が顕著となる温度である温度400℃の領域が約10mm/hの速度で壁側から炭中部に向かって移動し、炭化室の壁側から炭中部に向かって常に温度分布が存在する。
【0024】
従って、乾留処理時間を通してガスやタール等の副生物が常に発生していることになる。
更に、コークス炉炭化室の大きさは、長さが15m程度で高さが6m前後にも達するため、この広大な面を均一に加熱するのはもともと容易ではなく、さらに炭化室は一般的には炉長方向に70mm程度のテーパーを有していること、あるいは炉蓋が設置された炉長方向両端部では放熱量が不可避的に多い等の事実があるため、炭化室に装入した石炭は程度の差こそあれ不均一に乾留されている。
【0025】
従って、乾留終了時点のコークス排出時においても、局部的に乾留の進行が遅れ副生物の発生が起きている部分が残存している可能性が高い。
このように副生物の発生が起きている乾留末期の時に、乾留末期の皿弁を閉にして上昇管と集気本管とを縁切りすると、上昇管の天蓋からこれらの副生物が排出されるおそれがある。
【0026】
これらの副生物は、上昇管を出たところで空気と接触するため、ガスの温度が高い場合は自然着火する。また着火しない場合は、イグナイタ等の種火により着火させる場合もある。
【0027】
従って、可燃成分の大部分は燃焼して消滅するが、燃焼状況が適切ではなくて、可燃成分の一部が未燃のまま残存すると、それらがそのまま大気中に放散してしまうことになる。
【0028】
ここに、請求項1に記載の発明1によると、上昇管の内部に予め酸素含有ガスを添加し放散ガスとの混合ガスを形成することにより、未燃の副生物が低減できる。
【0029】
酸素含有ガスの添加場所は、上昇管の低部である。
その理由は、低部の方が高温に保たれ且つ副生物との混合が良く燃焼性が向上するからである。
【0030】
酸素含有ガスを添加する箇所は、1ヶ所でもよいが、2ヶ所以上が更に好ましい。
請求項2に記載の発明2によると、上昇管の内部に旋回流を起こすように酸素含有ガスを添加すると、未燃の副生物を更に低減できる。
【0031】
上昇管の内部で旋回流を起こすように酸素含有ガスを添加する方法としては、例えば上昇管の中心から偏心した方向にガスを添加する方法等がある。
請求項3に記載の発明3によると、上昇管の出口上部で上昇管の中心線に向かって酸素含有ガスを添加する手段として散気管が使用できる。この散気管としては、酸素含有ガスが添加される開口部が例えばスリット状になっており、リング状のスリットノズル等が使用できる。
【0032】
また、この散気管としてリング状のスリットノズルを使用する場合に、そのノズル内径が上昇管の内径より大きい管であることが望ましい。その理由は、そのノズルの内径が上昇管の内径より小さいと副生物が流失するおそれが高くなるからである。
【0033】
上昇管の中心線に向かって酸素含有ガスを添加するときの仰角は、水平面を基準に0度〜60度であることが好ましい。
その理由は、0度未満では、上昇管のドラフト力を阻害するおそれがあり、60度を超えると上昇管から排出されるガスが酸素含有ガスと接触する前に逸散のおそれがあるからである。
【0034】
酸素含有ガスとして、空気、酸素富化空気、工業用純酸素等が使用できる。
【0035】
【実施例】
図3は、炭化室および上昇管を模擬した実験装置の概念図である。
図4(a)、(b)は、上昇管中への予混合空気の添加方法を示す概念図であり、図4(a)は予混合空気が衝突し合う添加方法を、図4(b)は予混合空気が旋回流れを起こす添加方法である。
【0036】
図5は、上昇管中への予混合空気を添加し、さらに上昇管の出口上部で、上昇管の中心線に向かって散気管で空気を添加する方法を示す概念図である。
図5におけるリング状の散気管9は、内径が上昇管2の内径より大きいスリットノズルを備えており、スリットの内側角度、つまり仰角を変更できるようになっている。
【0037】
(実施例1)
図3の実験装置を使用し、模擬コークス炉ガスとして調整した混合ガス(H2:55容量%、CH4:25容量%、C24:5容量%、N2:15容量%)と、タール成分の模擬物質として加熱器6で加熱したベンゼンとを、混合器10で混合してベンゼン気体量を約0.1容量%とした。
【0038】
表1に混合後のガスの組成を示す。
【0039】
【表1】

Figure 0003695300
上記混合後のガスを予熱器7で450℃に予熱して上昇管2に供給するとともに、予熱後のガスと等容量の予混合空気を模擬の上昇管2の入口付近にて添加し、上昇管の出口に設置されたイグナイタ8による燃焼性を試験した。
【0040】
予混合空気は、図4(a)で示す方法で添加した。
燃焼試験の間、上昇管2の出口でサンプルガスを適宜採取し、ガス中の水素および各炭化水素濃度(以下、可燃性ガスの濃度ともいう)を測定した。
【0041】
表2に本発明例の試験結果を示す。
【0042】
【表2】
Figure 0003695300
表2に示すように、燃焼後の排ガス中の可燃性ガスの濃度は好適に低下した。
【0043】
比較例として、予混合空気を添加しなかった以外は本発明例と同様の試験を行った。
表3に比較例の試験結果を示す。
【0044】
【表3】
Figure 0003695300
表3に示すように、排ガス中の可燃性ガスの濃度は十分には低下していないことがわかった。
【0045】
これより、本発明例のように上昇管の内部に予混合空気を添加することにより、ガスの燃焼性が飛躍的に向上して、未燃ガスの放散を大幅に減少可能であることがわかった。
【0046】
(実施例2)
予混合空気を図4(b)の方式で添加した以外は実施例1の本発明例と同様の装置および条件で燃焼性を試験した。
【0047】
表4に本発明例の試験結果を示す。
【0048】
【表4】
Figure 0003695300
表4に示すように、燃焼後の排ガス中の可燃性ガスの濃度が更に低下し、実施例1の本発明例の場合よりも燃焼性は向上した。
【0049】
上昇管の内部に旋回流が生じるように空気を添加すると、燃焼性が向上することを確認できた。
(実施例3)
図3で示した上昇管2の出口上部に、散気管9(仰角:45度)を設置した図5に示す実験装置を使用する以外は実施例2の本発明例と同様の条件で燃焼性を試験した。
【0050】
表5に本発明例の試験結果を示す。
【0051】
【表5】
Figure 0003695300
表5に示すように、燃焼後の排ガス中の可燃性ガスの濃度は非常に低く、実施例2の本発明例の場合よりもさらに燃焼性は向上した。
【0052】
この試験結果から上昇管の内部に旋回流が生じるように空気を添加し、さらに、上昇管の出口上部で、上昇管の中心線に向かって酸素含有ガスを添加すると、燃焼性がさらに向上することを確認できた。
【0053】
【発明の効果】
本発明により、コークス炉から副生する可燃性ガスが大気中に放散されるのを低減することができる。
【図面の簡単な説明】
【図1】副生物の回収工程を概念的に示すフロー図である。
【図2】上昇管の上部の天蓋が開放された場合の副生物のフロー図である。
【図3】炭化室および上昇管を模擬した実験装置の概念図である。
【図4】上昇管中への予混合空気の添加方法を示す概念図であり、図4(a)は予混合空気が衝突し合う添加方法を、図4(b)は予混合空気が旋回流れを起こす添加方法である。
【図5】上昇管中への予混合空気を添加し、さらに上昇管の出口上部で、上昇管の中心線に向かって散気管で空気を添加する方法を示す概念図である。
1:炭化室
2:上昇管
3:集気本管
4:天蓋
5:皿弁
6:加熱器
7:予熱器
8:イグナイタ
9:散気管[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a coke oven for producing coke for a blast furnace, and more particularly, to a method for treating a coke oven discharge by-product that reduces the release of by-products from the coke oven into the atmosphere.
[0002]
[Prior art]
Most of the coke produced in Japan is used in blast furnaces.
A chamber furnace type coke oven for producing coke has a structure in which a carbonization chamber for carbonizing coal and a combustion chamber for supplying heat to the carbonization chamber are alternately arranged in a sandwich shape.
[0003]
For example, 20 to 40 tons of raw coal is charged into the carbonization chamber at a time, calcined to about 1000 ° C. with a dry distillation time of around 24 hours, and discharged from the coke oven.
The red hot coke discharged from the coke oven is extinguished and cooled by wet cooling with water spray or dry cooling with inert gas, and becomes product coke.
[0004]
In this process of conversion from raw coal to reddish coke, coal contains gas mainly composed of hydrogen, tar or tar light oil, etc. at the same time.
FIG. 1 is a flowchart conceptually showing a by-product recovery process.
[0005]
As shown in the figure, in the state where the canopy 4 is closed and the dish valve 5 is opened, the by-products such as hydrogen and hydrocarbons and tar are discharged from the carbonization chamber 1 through the riser 2 and collected. The gas is introduced into the downstream purification / recovery process (not shown) through the main pipe 3.
[0006]
That is, by-products such as gas and tar generated in the coke oven are separated and purified and recovered as various products such as coke oven gas, light oil, and tar. For this purpose, the gas and the like generated in each carbonization chamber is first collected in the gas collection main pipe 3 and then introduced into the downstream purification process.
[0007]
For example, about 50 to 100 gate carbonization chambers are connected to the gas collecting main pipe 3, and a plate for opening and closing the connection with each carbonizing chamber between each carbonizing chamber and the gas collecting main pipe. A valve is installed in each carbonization chamber.
[0008]
However, at the end of the dry distillation period, the dish valve 5 is closed, the gap between the air collecting main pipe 3 and the rising pipe 2 is cut, and the canopy 4 above the rising pipe 2 is opened instead.
In this way, normally, the carbonization chamber and the gas collection main are connected with the dish valve open, but in order to suppress the mixing of air into the gas collection main during extrusion of coke cake including the end of dry distillation. It is common practice to close the dish valve to disconnect the carbonization chamber from the gas collection main.
[0009]
FIG. 2 is a flow diagram of by-products when the top canopy of the riser is opened.
As shown in the drawing, when by-products such as gas and tar remain in the carbonization chamber with the dish valve 5 closed and the canopy 4 open, these are diffused into the atmosphere from the upper part of the riser 2. There is a possibility.
[0010]
That is, when the operation of cutting off the communication between the carbonization chamber and the gas collection main is performed, the canopy at the top of the riser pipe is opened, and in this case, by-products such as gas remaining in the carbonization chamber are released. It is important not to dissipate into the atmosphere.
[0011]
[Problems to be solved by the invention]
By-products diffused into the atmosphere ignite and burn in contact with air at the outlet of the riser, and most of them are converted into CO 2 and H 2 O as combustion products, so there is no environmental problem.
[0012]
However, depending on the combustion conditions, there is a risk that a part of the by-products to be diffused will diffuse into the atmosphere without being burned.
Accumulation of by-products diffused in the atmosphere is undesirable from the viewpoint of protecting the global environment, and some measures are necessary.
[0013]
It is an object of the present invention to provide a method for treating coke oven discharge by-products that reduces by-products from the coke oven from being released into the atmosphere.
[0014]
[Means for Solving the Problems]
The present inventors have made various studies on the reduction of by-products emitted from the coke oven riser into the atmosphere and have obtained the following knowledge.
[0015]
(A) As a result of various investigations on the flammability of by-products diffused in the atmosphere without burning, an oxygen-containing gas is added in advance to the inside of the riser to form a mixed gas with the diffused gas Thus, it was found that unburned by-products can be reduced.
[0016]
(B) It has also been found that unburned by-products can be further reduced by adding an oxygen-containing gas so as to cause a swirling flow inside the riser.
(C) Furthermore, it was found that unburned by-products can be reduced by adding an oxygen-containing gas toward the center line of the riser tube at the upper outlet of the riser tube.
[0017]
It can be presumed that the combustibility is improved by the methods (A) to (C) because the mixing uniformity of the by-product and the oxygen-containing gas becomes good.
The present invention has been made based on the above findings, and the gist thereof is as follows.
[0018]
(1) Coke characterized by adding oxygen-containing gas from the lower part of the riser to the inside of the riser during the operation in which dry distillation by-products are atmospherically combusted from the upper part of the riser of the coke oven or are directly released into the atmosphere. Treatment method of furnace discharge by-products.
[0019]
(2) The coke oven discharge by-product treatment method as described in (1) above , wherein an oxygen-containing gas is added so that a swirling flow is generated in the ascending pipe .
(3) The method for treating coke oven discharge by-products as described in (1) or (2) above, wherein an oxygen-containing gas is added toward the center line of the riser pipe at the upper outlet of the riser pipe.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
When coal is charged into the coke oven carbonization chamber, the temperature of the coal rises due to heat from the combustion chambers on both sides of the carbonization chamber via bricks. When the temperature of the coal rises to about 400 ° C., the solid coal becomes softened and melted.
[0021]
At the same time, the generation of volatile components such as gas and tar becomes remarkable, and these are collected from the space above the carbonization chamber through the ascending pipe to the collecting main and sent to the downstream separation and purification process.
[0022]
The width of the carbonization chamber is around 450 mm, and the coal of this width is heated by conduction heat transfer from the combustion chambers on both sides. Since it is heated in such a form, the rate of temperature rise is small, and eventually it takes about a day and a night for the central portion (in the charcoal) to be baked to about 1000 ° C.
[0023]
That is, a region at a temperature of 400 ° C., which is a temperature at which generation of volatile components such as gas and tar becomes remarkable, moves from the wall side toward the middle of the coal at a speed of about 10 mm / h, There is always a temperature distribution toward.
[0024]
Therefore, by-products such as gas and tar are constantly generated throughout the dry distillation treatment time.
Furthermore, the coke oven carbonization chamber has a length of about 15 m and a height of around 6 m, so it is not easy to heat this vast surface uniformly. Has a taper of about 70mm in the furnace length direction, or the fact that heat is unavoidably large at both ends of the furnace length direction where the furnace lids are installed. Is dry distilled unevenly to some extent.
[0025]
Therefore, even at the time of coke discharge at the end of dry distillation, there is a high possibility that a portion where the progress of dry distillation is delayed locally and by-products are generated remains.
In this way, when the by-product is occurring at the end of the dry distillation period, the end valve of the dry distillation period is closed and the riser pipe and the air collection main are cut off, and these by-products are discharged from the canopy of the riser pipe. There is a fear.
[0026]
These by-products come into contact with air as they exit the riser, and thus ignite spontaneously when the gas temperature is high. Moreover, when not igniting, it may be ignited with seed lights, such as an igniter.
[0027]
Therefore, most of the combustible components burn and disappear, but the combustion state is not appropriate, and if some of the combustible components remain unburned, they are diffused into the atmosphere as they are.
[0028]
According to the first aspect of the present invention, unburned by-products can be reduced by previously adding an oxygen-containing gas to the inside of the riser to form a mixed gas with the emission gas.
[0029]
The place where the oxygen-containing gas is added is in the lower part of the riser .
The reason is that the lower part is kept at a higher temperature and the mixing with by-products is better and the combustibility is improved.
[0030]
The location where the oxygen-containing gas is added may be one, but more preferably two or more.
According to the second aspect of the present invention, when the oxygen-containing gas is added so as to cause a swirling flow inside the riser, unburned by-products can be further reduced.
[0031]
As a method of adding the oxygen-containing gas so as to cause a swirling flow inside the riser, for example, there is a method of adding a gas in a direction eccentric from the center of the riser.
According to the third aspect of the present invention, the air diffuser can be used as a means for adding the oxygen-containing gas toward the center line of the riser at the upper outlet of the riser. As this air diffuser, the opening to which the oxygen-containing gas is added has, for example, a slit shape, and a ring-shaped slit nozzle or the like can be used.
[0032]
Further, when a ring-shaped slit nozzle is used as the air diffuser, it is desirable that the inner diameter of the nozzle is larger than the inner diameter of the rising pipe. The reason is that if the inner diameter of the nozzle is smaller than the inner diameter of the riser pipe, the risk of by-products flowing out increases.
[0033]
The elevation angle when the oxygen-containing gas is added toward the center line of the riser is preferably 0 to 60 degrees with respect to the horizontal plane.
The reason is that if it is less than 0 degrees, the drafting force of the riser may be hindered, and if it exceeds 60 degrees, the gas discharged from the riser may be dissipated before coming into contact with the oxygen-containing gas. is there.
[0034]
As the oxygen-containing gas, air, oxygen-enriched air, industrial pure oxygen, or the like can be used.
[0035]
【Example】
FIG. 3 is a conceptual diagram of an experimental apparatus simulating a carbonization chamber and a riser pipe.
4 (a) and 4 (b) are conceptual diagrams showing a method of adding premixed air into the ascending pipe. FIG. 4 (a) shows a method of adding premixed air that collides with FIG. 4 (b). ) Is a method of adding premixed air to cause a swirling flow.
[0036]
FIG. 5 is a conceptual diagram showing a method of adding premixed air into the riser pipe and further adding air through the diffuser pipe toward the center line of the riser pipe at the upper outlet of the riser pipe.
The ring-shaped air diffuser 9 in FIG. 5 includes a slit nozzle having an inner diameter larger than the inner diameter of the riser 2 so that the inner angle of the slit, that is, the elevation angle can be changed.
[0037]
(Example 1)
Using the experimental device of FIG. 3, the mixed gas was adjusted as simulated coke oven gas (H 2: 55 volume%, CH 4: 25 volume%, C 2 H 4: 5 volume%, N 2: 15% by volume) and Then, benzene heated by the heater 6 as a simulation substance of the tar component was mixed by the mixer 10 to make the amount of benzene gas about 0.1% by volume.
[0038]
Table 1 shows the composition of the gas after mixing.
[0039]
[Table 1]
Figure 0003695300
The mixed gas is preheated to 450 ° C. by the preheater 7 and supplied to the riser 2, and a premixed air having the same volume as the preheated gas is added near the inlet of the simulated riser 2 to rise. The flammability by the igniter 8 installed at the outlet of the tube was tested.
[0040]
The premixed air was added by the method shown in FIG.
During the combustion test, a sample gas was appropriately collected at the outlet of the ascending pipe 2, and the concentration of hydrogen and each hydrocarbon in the gas (hereinafter also referred to as the concentration of combustible gas) was measured.
[0041]
Table 2 shows the test results of the examples of the present invention.
[0042]
[Table 2]
Figure 0003695300
As shown in Table 2, the concentration of the combustible gas in the exhaust gas after combustion suitably decreased.
[0043]
As a comparative example, a test similar to that of the present invention example was performed except that premixed air was not added.
Table 3 shows the test results of the comparative examples.
[0044]
[Table 3]
Figure 0003695300
As shown in Table 3, it was found that the concentration of combustible gas in the exhaust gas was not sufficiently lowered.
[0045]
From this, it can be seen that by adding premixed air to the inside of the riser pipe as in the present invention example, the flammability of the gas can be dramatically improved and the emission of unburned gas can be greatly reduced. It was.
[0046]
(Example 2)
The flammability was tested under the same apparatus and conditions as in Example 1 of the present invention except that premixed air was added in the manner shown in FIG.
[0047]
Table 4 shows the test results of the examples of the present invention.
[0048]
[Table 4]
Figure 0003695300
As shown in Table 4, the concentration of the combustible gas in the exhaust gas after combustion was further lowered, and the combustibility was improved as compared with the case of the inventive example of Example 1.
[0049]
It was confirmed that the combustibility was improved when air was added so that a swirling flow was generated inside the ascending pipe.
(Example 3)
Except for using the experimental apparatus shown in FIG. 5 in which a diffuser tube 9 (elevation angle: 45 degrees) is installed in the upper part of the outlet of the ascending pipe 2 shown in FIG. Was tested.
[0050]
Table 5 shows the test results of the examples of the present invention.
[0051]
[Table 5]
Figure 0003695300
As shown in Table 5, the concentration of the combustible gas in the exhaust gas after combustion was very low, and the combustibility was further improved as compared with the inventive example of Example 2.
[0052]
From this test result, combustibility is further improved by adding air so that a swirling flow is generated inside the riser, and further adding an oxygen-containing gas toward the centerline of the riser at the upper outlet of the riser. I was able to confirm that.
[0053]
【The invention's effect】
By this invention, it can reduce that the combustible gas byproduced from a coke oven is diffused in air | atmosphere.
[Brief description of the drawings]
FIG. 1 is a flowchart conceptually showing a recovery process of by-products.
FIG. 2 is a by-product flow diagram when the top canopy of the riser is opened.
FIG. 3 is a conceptual diagram of an experimental apparatus simulating a carbonization chamber and a riser pipe.
FIGS. 4A and 4B are conceptual diagrams showing a method of adding premixed air into the riser. FIG. 4A shows an addition method in which premixed air collides, and FIG. 4B shows swirling of premixed air. It is an addition method that causes flow.
FIG. 5 is a conceptual diagram showing a method of adding premixed air into the riser pipe and further adding air through the diffuser pipe toward the centerline of the riser pipe at the upper outlet of the riser pipe.
1: Carbonization chamber 2: Rising pipe 3: Collection main pipe 4: Canopy 5: Dish valve 6: Heater 7: Preheater 8: Igniter 9: Air diffuser

Claims (3)

コークス炉の上昇管の上部から乾留副生物を大気燃焼、または、そのまま大気放散する操業時に、前記上昇管の内部に上昇管低部から酸素含有ガスを添加することを特徴とするコークス炉排出副生物の処理方法。The coke oven discharge by-product is characterized in that an oxygen-containing gas is added to the inside of the riser pipe from the lower part of the riser pipe during the operation in which the dry distillation by-products are atmospherically burned from the upper part of the riser pipe of the coke oven or is released into the atmosphere as it is. Biological treatment method. 上昇管内に旋回流が生じるように前記酸素含有ガスを添加することを特徴とする請求項1に記載のコークス炉排出副生物の処理方法。The coke oven discharge by-product treatment method according to claim 1, wherein the oxygen-containing gas is added so that a swirling flow is generated in the ascending pipe . 前記上昇管の出口上部で、上昇管の中心線に向かって酸素含有ガスを添加することを特徴とする請求項1または2に記載のコークス炉排出副生物の処理方法。  The coke oven discharge by-product treatment method according to claim 1 or 2, wherein an oxygen-containing gas is added toward the center line of the riser pipe at the upper outlet of the riser pipe.
JP2000276527A 1999-09-30 2000-09-12 Coke oven discharge by-product processing method Expired - Fee Related JP3695300B2 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101752909B1 (en) * 2010-12-21 2017-06-30 주식회사 포스코 Method and apparatus for manufacturing partially-carbonized coal briquettes, and apparatus for manufacturing molten irons

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101752909B1 (en) * 2010-12-21 2017-06-30 주식회사 포스코 Method and apparatus for manufacturing partially-carbonized coal briquettes, and apparatus for manufacturing molten irons

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