JP6652088B2

JP6652088B2 - Exhaust gas treatment equipment for coke ovens

Info

Publication number: JP6652088B2
Application number: JP2017036108A
Authority: JP
Inventors: 幹夫越智; 信司荒川
Original assignee: JFE Steel Corp
Current assignee: JFE Steel Corp
Priority date: 2017-02-28
Filing date: 2017-02-28
Publication date: 2020-02-19
Anticipated expiration: 2037-02-28
Also published as: JP2018141072A

Description

本発明は、コークス炉からの排ガスを集塵処理して排出するコークス炉の排ガス処理装置に関する。 The present invention relates to a coke oven exhaust gas treatment device that collects and discharges exhaust gas from a coke oven.

従来から、石炭を乾留してコークスを生成する炭化室と、炭化室に隣接して加熱する燃焼室とが、壁を介して交互に並ぶコークス炉において、燃焼室からの排ガス中に含まれる煤塵を集塵機によって除去することが知られている。また、不測の事態によって排ガスの集塵処理が突如停止した場合であっても、煙道内での排ガスの異常燃焼を防止可能な排ガス処理装置が提案されている。具体的には、特許文献１には、集塵排ガス経路の出側開口端部に設けられ、集塵排ガス経路を通じて煙突内に導入される集塵処理後の排ガス（集塵排ガス）を煙突の開口幅方向に分散させる分散板が開示されている。 Conventionally, in a coke oven in which a carbonization chamber that carbonizes coal to produce coke and a combustion chamber that heats adjacent to the carbonization chamber are alternately arranged through walls, soot and dust contained in exhaust gas from the combustion chamber Is known to be removed by a dust collector. Further, there has been proposed an exhaust gas treatment apparatus capable of preventing abnormal combustion of exhaust gas in a flue even when dust collection processing of exhaust gas is suddenly stopped due to an unexpected situation. Specifically, Patent Literature 1 discloses that exhaust gas (dust exhaust gas) after dust collection processing, which is provided at an outlet opening end of a dust exhaust gas path and is introduced into a chimney through a dust exhaust gas path, is provided to the stack. A dispersion plate for dispersing in the opening width direction is disclosed.

特開２０１５−３９９２号公報JP 2015-3992 A

一般的に、煙突の下部は、地震等によって煙突が転倒しないように強固な構造を有している。このため、煙突の下部に集塵機の吐出ダクトを接続する場合、その接続位置は煙突の構造上の制約から例えば地表から１０ｍ程度の高さ位置になる。また、集塵機本体は地表に設置されるファン等の重量の大きい装置を備えるために、吐出ダクトには鉛直上方に伸びる立ち上がり部分が存在する。このため、立ち上がり部分を煙突近傍に設ける場合には、吐出ダクトには煙突の側面方向に向かう略直角に屈曲するベンド部が必要になる。 Generally, the lower part of the chimney has a strong structure so that the chimney does not fall down due to an earthquake or the like. For this reason, when the discharge duct of the dust collector is connected to the lower part of the chimney, the connection position is, for example, about 10 m above the ground surface due to the structural limitation of the chimney. In addition, since the dust collector body includes a heavy device such as a fan installed on the ground surface, the discharge duct has a rising portion extending vertically upward. Therefore, when the rising portion is provided in the vicinity of the chimney, the discharge duct needs a bend portion bent at a substantially right angle toward the side surface of the chimney.

ところが、吐出ダクトにベンド部を設けた場合、吐出ダクトの吐出口付近における集塵排ガスの流れが上方向に偏る。このため、コークス炉からの集塵処理されていない排ガスを煙突下部に導入可能な煙突において、集塵排ガスをその上部に導入する場合、煙突内に合流した後、集塵排ガスが煙突内に漂う集塵処理されていない排ガス（未集塵排ガス）を吸い上げることによって未集塵排ガスが煙突から排出されてしまう。しかしながら、特許文献１記載の分散板は、集塵排ガスを煙突の開口幅方向に分散させるだけであるので、集塵排ガスが煙突内に漂う未集塵排ガスを吸い上げることによって未集塵排ガスが煙突から排出されることを抑制できない。 However, when the discharge duct is provided with the bend portion, the flow of the dust collection exhaust gas near the discharge port of the discharge duct is biased upward. For this reason, in the stack where the exhaust gas not subjected to dust collection from the coke oven can be introduced into the lower part of the chimney, when the exhaust gas is introduced into the upper part of the stack, the dust exhaust gas flows into the stack after merging into the chimney. By sucking up the exhaust gas that has not been subjected to the dust collection processing (uncollected exhaust gas), the uncollected exhaust gas is discharged from the chimney. However, the dispersion plate described in Patent Document 1 merely disperses the collected exhaust gas in the width direction of the chimney, so that the collected exhaust gas sucks up the uncollected exhaust gas floating in the chimney. Can not be suppressed from being discharged from.

本発明は、上記課題に鑑みてなされたものであって、その目的は、集塵処理後の排ガスが煙突内に漂う集塵処理されていない排ガスを吸い上げることによって集塵処理されていない排ガスが煙突から排出されることを抑制可能なコークス炉の排ガス処理装置を提供することにある。 The present invention has been made in view of the above-described problems, and an object of the present invention is to remove exhaust gas that has not been subjected to dust collection processing by sucking up exhaust gas that has not been subjected to dust collection processing in which exhaust gas after dust collection floats in a chimney. An object of the present invention is to provide a coke oven exhaust gas treatment device capable of suppressing discharge from a chimney.

本発明の第１の態様に係るコークス炉の排ガス処理装置は、水平方向に設けられた、コークス炉から排出された排ガスが供給される煙道と、前記煙道から分岐し、鉛直方向に立設された煙突の第１高さ位置に前記排ガスを導入する未集塵排ガス経路と、前記煙道から分岐して前記排ガスを吸引する吸引ダクト、前記吸引ダクトによって吸引された排ガスを集塵処理する集塵機、及び集塵処理された排ガスを前記第１高さ位置よりも高い前記煙突の第２高さ位置に導入する吐出ダクトと、を有する集塵排ガス経路と、を備えるコークス炉の排ガス処理装置において、前記排ガス処理装置は、前記未集塵排ガス経路が開放されている状態で運転され、前記吸引ダクトに吸引される排ガスの量が前記コークス炉から排出される排ガスの量以上であり、前記吐出ダクトは、前記煙突の側面に略水平方向から接続する水平部と、前記水平部より前記排ガスの流れ方向上流側において略鉛直方向に立ち上がる鉛直部と、前記水平部と前記鉛直部とを接続する屈曲構造を有するベンド部と、を備え、前記ベンド部内には該ベンド部の屈曲中心と略同じ屈曲中心を有する屈曲構造の案内板が前記ベンド部の径方向に１又は複数枚設けられていることを特徴とする。 An exhaust gas treatment device for a coke oven according to a first aspect of the present invention is provided with a flue provided with exhaust gas discharged from a coke oven, which is provided in a horizontal direction, and a vertical branch that branches off from the flue and stands in a vertical direction. An uncollected exhaust gas path for introducing the exhaust gas at a first height position of the provided chimney, a suction duct branched from the flue to suck the exhaust gas, and a dust collection process for the exhaust gas sucked by the suction duct. Exhaust gas path for a coke oven, comprising: a dust collector that performs dust collection; and a discharge duct that introduces exhaust gas that has been subjected to dust collection to a second height position of the chimney higher than the first height position. In the apparatus, the exhaust gas treatment device is operated in a state where the uncollected exhaust gas path is open, and the amount of exhaust gas sucked into the suction duct is equal to or more than the amount of exhaust gas discharged from the coke oven. The discharge duct includes a horizontal portion connected to the side surface of the chimney from a substantially horizontal direction, a vertical portion rising substantially vertically on the upstream side in the exhaust gas flow direction from the horizontal portion, and the horizontal portion and the vertical portion. And a bend portion having a bent structure for connection, wherein one or more guide plates having a bent structure having a bending center substantially the same as the bending center of the bend portion are provided in the bend portion in the radial direction of the bend portion. It is characterized by having.

本発明の第２の態様に係るコークス炉の排ガス処理装置は、水平方向に設けられた、コークス炉から排出された排ガスが供給される煙道と、前記煙道から分岐し、鉛直方向に立設された煙突の第１高さ位置に前記排ガスを導入する未集塵排ガス経路と、前記煙道から分岐して前記排ガスを吸引する吸引ダクト、前記吸引ダクトによって吸引された排ガスを集塵処理する集塵機、及び集塵処理された排ガスを前記第１高さ位置よりも高い前記煙突の第２高さ位置に導入する吐出ダクトと、を有する集塵排ガス経路と、を備えるコークス炉の排ガス処理装置において、前記排ガス処理装置は、前記未集塵排ガス経路が開放されている状態で運転され、前記吸引ダクトに吸引される排ガスの量が前記コークス炉から排出される排ガスの量以上であり、前記吐出ダクトは、前記煙突の側面に略水平方向から接続する水平部と、前記水平部より前記排ガスの流れ方向上流側において略鉛直方向に立ち上がる鉛直部と、前記水平部と前記鉛直部とを接続する屈曲構造を有するベンド部と、を備え、前記吐出ダクトの吐出口の内部には、前記煙突の軸に対して水平方向に広がる複数の分散板が設置されていることを特徴とする。 An exhaust gas treatment apparatus for a coke oven according to a second aspect of the present invention is provided with a flue provided with exhaust gas discharged from a coke oven, which is provided in a horizontal direction, and a branch from the flue, which stands vertically. An uncollected exhaust gas path for introducing the exhaust gas at a first height position of the provided chimney, a suction duct branched from the flue to suck the exhaust gas, and a dust collection process for the exhaust gas sucked by the suction duct. Exhaust gas path for a coke oven, comprising: a dust collector that performs dust collection; and a discharge duct that introduces exhaust gas that has been subjected to dust collection to a second height position of the chimney higher than the first height position. In the apparatus, the exhaust gas treatment device is operated in a state where the uncollected exhaust gas path is open, and the amount of exhaust gas sucked into the suction duct is equal to or more than the amount of exhaust gas discharged from the coke oven. The discharge duct includes a horizontal portion connected to the side surface of the chimney from a substantially horizontal direction, a vertical portion rising substantially vertically on the upstream side in the exhaust gas flow direction from the horizontal portion, and the horizontal portion and the vertical portion. And a bend portion having a bent structure for connection, wherein a plurality of dispersion plates extending horizontally with respect to the axis of the chimney are provided inside the discharge port of the discharge duct.

本発明の第３の態様に係るコークス炉の排ガス処理装置は、水平方向に設けられた、コークス炉から排出された排ガスが供給される煙道と、前記煙道から分岐し、鉛直方向に立設された煙突の第１高さ位置に前記排ガスを導入する未集塵排ガス経路と、前記煙道から分岐して前記排ガスを吸引する吸引ダクト、前記吸引ダクトによって吸引された排ガスを集塵処理する集塵機、及び集塵処理された排ガスを前記第１高さ位置よりも高い前記煙突の第２高さ位置に導入する吐出ダクトと、を有する集塵排ガス経路と、を備えるコークス炉の排ガス処理装置において、前記排ガス処理装置は、前記未集塵排ガス経路が開放されている状態で運転され、前記吸引ダクトに吸引される排ガスの量が前記コークス炉から排出される排ガスの量以上であり、前記吐出ダクトは、前記煙突の側面に略水平方向から接続する水平部と、前記水平部より前記排ガスの流れ方向上流側において略鉛直方向に立ち上がる鉛直部と、前記水平部と前記鉛直部とを接続する屈曲構造を有するベンド部と、を備え、前記ベンド部内には該ベンド部の屈曲中心と略同じ屈曲中心を有する屈曲構造の案内板が前記ベンド部の径方向に沿って１又は複数枚設けられ、前記吐出ダクトの吐出口の内部には、前記煙突の軸に対して水平方向に広がる複数の分散板が設置されていることを特徴とする。 An exhaust gas treatment device for a coke oven according to a third aspect of the present invention is provided with a flue provided with exhaust gas discharged from the coke oven, which is provided in a horizontal direction, and a branch from the flue, which stands vertically. An uncollected exhaust gas path for introducing the exhaust gas at a first height position of the provided chimney, a suction duct branched from the flue to suck the exhaust gas, and a dust collection process for the exhaust gas sucked by the suction duct. Exhaust gas path for a coke oven, comprising: a dust collector that performs dust collection; and a discharge duct that introduces exhaust gas that has been subjected to dust collection to a second height position of the chimney higher than the first height position. In the apparatus, the exhaust gas treatment device is operated in a state where the uncollected exhaust gas path is open, and the amount of exhaust gas sucked into the suction duct is equal to or more than the amount of exhaust gas discharged from the coke oven. The discharge duct includes a horizontal portion connected to the side surface of the chimney from a substantially horizontal direction, a vertical portion rising substantially vertically on the upstream side in the exhaust gas flow direction from the horizontal portion, and the horizontal portion and the vertical portion. A bend portion having a bent structure to be connected, and one or a plurality of guide plates having a bent structure having substantially the same bending center as the bending center of the bend portion in the bend portion along the radial direction of the bend portion. A plurality of dispersing plates are provided inside the discharge port of the discharge duct, and are spread in a horizontal direction with respect to the axis of the chimney.

本発明に係るコークス炉の排ガス処理装置は、上記発明において、前記吐出ダクトの吐出口の断面形状は、鉛直方向の辺の長さよりも水平方向の辺の長さが長い略長方形形状であり、前記分散板の設置箇所において前記吐出ダクトの吐出口が前記排ガスの流れ方向上流側から流れ方向下流側に向けて鉛直方向に絞られていることを特徴とする。 In the exhaust gas treatment device for a coke oven according to the present invention, in the above invention, a cross-sectional shape of the discharge port of the discharge duct is a substantially rectangular shape in which a length of a horizontal side is longer than a length of a vertical side, A discharge port of the discharge duct is narrowed in a vertical direction from an upstream side in the flow direction of the exhaust gas to a downstream side in the flow direction at the installation location of the dispersion plate.

本発明に係るコークス炉の排ガス処理装置は、上記発明において、前記吐出ダクトから吐出される集塵処理後の排ガスの温度は前記煙道を流れる集塵処理されていない排ガスの温度よりも低く、前記吐出ダクトから吐出される集塵処理後の排ガスの単位時間当たりの運動量を煙突の断面積で除算した値が、集塵処理されていない排ガスの温度と集塵処理後の排ガスの温度との差及び前記煙道の高さ位置と前記吐出ダクトの吐出口の高さ位置と差により生じる浮力による圧力の６倍以上であることを特徴とする。 In the exhaust gas treatment device for a coke oven according to the present invention, in the above invention, the temperature of the exhaust gas after the dust collection process discharged from the discharge duct is lower than the temperature of the exhaust gas that has not been subjected to the dust collection process flowing through the flue, The value obtained by dividing the momentum per unit time of exhaust gas discharged from the discharge duct after the dust collection process by the cross-sectional area of the chimney is the difference between the temperature of the exhaust gas not subjected to the dust collection process and the temperature of the exhaust gas after the dust collection process. The pressure is at least six times the pressure due to buoyancy caused by the difference and the height position of the flue and the height position of the discharge port of the discharge duct.

本発明に係るコークス炉の排ガス処理装置は、上記発明において、前記吸引ダクトとの接続箇所における前記煙道の断面形状は略長方形形状であり、前記煙道との接続箇所における前記吸引ダクトの開口部は前記煙道の長辺側に長いことを特徴とする。 In the exhaust gas treatment apparatus for a coke oven according to the present invention, in the above invention, a cross-sectional shape of the flue at a connection point with the suction duct is substantially rectangular, and an opening of the suction duct at a connection point with the flue. The portion is long on the long side of the flue.

本発明に係るコークス炉の排ガス処理装置は、上記発明において、前記吸引ダクトとの接続箇所における前記煙道の断面形状は略半円形形状であり、前記煙道との接続箇所における前記吸引ダクトの開口部は前記煙道の直径側に長いことを特徴とする。 In the exhaust gas treatment apparatus for a coke oven according to the present invention, in the above invention, a cross-sectional shape of the flue at a connection point with the suction duct is substantially a semicircular shape, and the suction duct at a connection point with the flue is The opening is long on the diameter side of the flue.

本発明に係るコークス炉の排ガス処理装置は、上記発明において、前記煙道との接続箇所における前記吸引ダクトの開口部の幅は、前記煙道の断面幅の７０％以上であることを特徴とする。 In the exhaust gas treatment device for a coke oven according to the present invention, in the above invention, a width of an opening of the suction duct at a connection point with the flue is 70% or more of a cross-sectional width of the flue. I do.

本発明に係るコークス炉の排ガス処理装置によれば、集塵処理後の排ガスが煙突内に漂う集塵処理されていない排ガスを吸い上げることによって集塵処理されていない排ガスが煙突から排出されることを抑制できる。 According to the exhaust gas treatment apparatus for a coke oven according to the present invention, the exhaust gas after the dust collection process is discharged from the chimney by sucking up the exhaust gas not subjected to the dust collection process that floats in the chimney. Can be suppressed.

図１は、本発明の一実施形態であるコークス炉の排ガス処理装置の全体構成を示す模式図である。FIG. 1 is a schematic diagram showing the entire configuration of an exhaust gas treatment device for a coke oven according to one embodiment of the present invention. 図２は、吸引ダクト及び吐出ダクトの構成を説明するための平面図及び側面図である。FIG. 2 is a plan view and a side view for explaining the configuration of the suction duct and the discharge duct. 図３は、吐出ダクトの構成を示す鉛直方向断面図及び平面方向断面図である。FIG. 3 is a vertical sectional view and a planar sectional view showing the configuration of the discharge duct. 図４は、図３に示す吐出ダクトの構成における煙突の鉛直方向断面内での集塵排ガスの速度分布を示す図である。FIG. 4 is a diagram showing a velocity distribution of the collected exhaust gas in a vertical cross section of the chimney in the configuration of the discharge duct shown in FIG. 図５は、案内板及び分散板のない吐出ダクトの構成における煙突の鉛直方向断面内での集塵排ガスの速度分布を示す図である。FIG. 5 is a diagram illustrating a velocity distribution of the collected exhaust gas in a vertical section of the chimney in the configuration of the discharge duct without the guide plate and the dispersion plate. 図６は、図３に示す吐出ダクトの変形例の構成を示す鉛直方向断面図及び平面方向断面図である。FIG. 6 is a vertical sectional view and a planar sectional view showing a configuration of a modified example of the discharge duct shown in FIG. 図７は、図６に示す吐出ダクトの構成における煙突の鉛直方向断面内での集塵排ガスの速度分布を示す図である。FIG. 7 is a diagram showing a velocity distribution of the collected exhaust gas in a vertical section of the chimney in the configuration of the discharge duct shown in FIG. 図８は、煙道と吸引ダクトとの接続部分の構成を示す平面図及び側面図である。FIG. 8 is a plan view and a side view showing a configuration of a connection portion between the flue and the suction duct. 図９は、煙道と吸引ダクトとの接続部分の変形例の構成を示す平面図及び側面図である。FIG. 9 is a plan view and a side view showing a configuration of a modified example of a connecting portion between the flue and the suction duct.

以下、図面を参照して、本発明の一実施形態であるコークス炉の排ガス処理装置の構成及びその動作について説明する。 Hereinafter, the configuration and operation of an exhaust gas treatment device for a coke oven according to an embodiment of the present invention will be described with reference to the drawings.

〔全体構成〕
まず、図１を参照して、本発明の一実施形態であるコークス炉の排ガス処理装置の全体構成について説明する。〔overall structure〕
First, an overall configuration of a coke oven exhaust gas treatment apparatus according to an embodiment of the present invention will be described with reference to FIG.

図１は、本発明の一実施形態であるコークス炉の排ガス処理装置の全体構成を示す模式図である。図１に示すように、本発明の一実施形態であるコークス炉の排ガス処理装置１は、コークス炉２からの排ガスを集塵処理して排出する装置であり、煙道３と、煙道３から分岐された未集塵排ガス経路４及び集塵排ガス経路５と、を備えている。なお、コークス炉２は、石炭を乾留してコークスを生成する炭化室と、炭化室に隣接して加熱する燃焼室とが、壁を介して交互に並んだ構成を有している。このようなコークス炉２では、老朽化等に伴い壁のレンガに亀裂等の隙間が生じると炭化室で発生したガスが壁のレンガの隙間を通って燃焼室内に流入し、燃焼室内で煤が生じて燃焼の排ガスと共に煤塵を含んだ排ガスとして排出される。 FIG. 1 is a schematic diagram showing the entire configuration of an exhaust gas treatment device for a coke oven according to one embodiment of the present invention. As shown in FIG. 1, an exhaust gas treatment device 1 for a coke oven according to an embodiment of the present invention is a device that collects and exhausts exhaust gas from a coke oven 2 and discharges the same. And an uncollected exhaust gas path 4 and a collected exhaust gas path 5 that are branched from the exhaust gas path. The coke oven 2 has a configuration in which a carbonization chamber for carbonizing coal to generate coke and a combustion chamber for heating adjacent to the carbonization chamber are alternately arranged via a wall. In such a coke oven 2, when a gap such as a crack is formed in the brick of the wall due to aging or the like, the gas generated in the carbonization chamber flows into the combustion chamber through the gap of the brick in the wall, and soot is generated in the combustion chamber. It is generated and discharged as exhaust gas containing dust together with the exhaust gas of combustion.

煙道３は、コークス炉２と煙突６とを連通して、コークス炉２から煙突６に通じる排ガス経路を形成する。詳細には、煙道３の入側開口端部はコークス炉２に接続されている。煙道３の出側は、未集塵排ガス経路４と集塵排ガス経路５とに分岐し、未集塵排ガス経路４と集塵排ガス経路５の各出側開口端部は煙突６に接続されている。このように、煙道３は、未集塵排ガス経路４と集塵排ガス経路５とに分岐してコークス炉２と煙突６とを連通させている。また、煙道３には、圧力調整弁７が設けられている。圧力調整弁７は、煙道３における未集塵排ガス経路４と集塵排ガス経路５との分岐部分に比して上流側（コークス炉２側）に設けられている。圧力調整弁７は、煙道３の開度を調整することによってコークス炉２からの排ガスの煙道３内における圧力を調整する。 The flue 3 connects the coke oven 2 and the chimney 6 to form an exhaust gas path leading from the coke oven 2 to the chimney 6. In detail, the inlet opening end of the flue 3 is connected to the coke oven 2. The outlet of the flue 3 is branched into an uncollected exhaust gas path 4 and a collected exhaust gas path 5. ing. As described above, the flue 3 is branched into the uncollected exhaust gas path 4 and the uncollected exhaust gas path 5 and connects the coke oven 2 and the chimney 6. The flue 3 is provided with a pressure regulating valve 7. The pressure control valve 7 is provided on the upstream side (the coke oven 2 side) of the flue 3 in comparison with a branch portion between the uncollected exhaust gas path 4 and the collected exhaust gas path 5. The pressure adjusting valve 7 adjusts the pressure of the exhaust gas from the coke oven 2 in the flue 3 by adjusting the opening of the flue 3.

未集塵排ガス経路４は、コークス炉２からの排ガス（未集塵排ガス）を煙突６の低部位へ直接供給する排ガス経路である。ここで、煙突６内の低部位とは、集塵排ガス経路５が集塵処理後の排ガス（集塵排ガス）を導入する煙突６内の所定部位（第２高さ位置）に比して低い高さ位置（第１高さ位置）のことを意味する。 The uncollected exhaust gas path 4 is an exhaust gas path for directly supplying the exhaust gas (uncollected exhaust gas) from the coke oven 2 to a low portion of the chimney 6. Here, the low portion in the chimney 6 is lower than a predetermined portion (second height position) in the chimney 6 where the exhaust gas path 5 introduces the exhaust gas after dust collection (dust exhaust gas). It means the height position (first height position).

集塵排ガス経路５は、ガス流量調整弁８、遮断弁９、集塵機１０、及び吸引送風機１１を備え、集塵機８を経由させてコークス炉２からの未集塵排ガスを集塵処理して煙突６内の所定部位に導入する排ガス経路である。 The dust-collecting exhaust gas path 5 includes a gas flow control valve 8, a shut-off valve 9, a dust collector 10, and a suction blower 11. The dust-collecting exhaust gas from the coke oven 2 is collected through the dust collector 8 and the chimney 6 is provided. It is an exhaust gas path to be introduced into a predetermined portion in the inside.

ガス流量調整弁８は、集塵排ガス経路５のうちの煙道３から分岐して未集塵排ガスを吸引する吸引ダクト５ａに配置されている。ガス流量調整弁８は、コークス炉２から集塵排ガス経路５へ流通する未集塵排ガスの流量を調整する。 The gas flow control valve 8 is disposed in a suction duct 5a that branches off from the flue 3 of the dust collection exhaust gas path 5 and sucks uncollected exhaust gas. The gas flow rate adjusting valve 8 adjusts the flow rate of uncollected exhaust gas flowing from the coke oven 2 to the exhaust gas path 5.

遮断弁９は、集塵排ガス経路５のうちのガス流量調整弁８と集塵機１０との間に配置されている。遮断弁９は、集塵排ガス経路５のうちの集塵機１０に通じる部分を開閉することによって、集塵機１０への未集塵排ガスの流通を許容又は遮断する。具体的には、遮断弁９は、集塵機１０等の立ち上げ又はメンテナンス等を行う期間のみ、集塵排ガス経路５を全閉状態にして、集塵機１０への未集塵排ガスの流通を遮断する。一方、遮断弁９は、この期間以外、すなわち、コークス炉２からの未集塵排ガスを集塵処理して煙突６から排出すべき期間、常に集塵排ガス経路５を開状態にして、集塵機１０への未集塵排ガスの流通を許容する。 The shutoff valve 9 is disposed between the gas flow control valve 8 and the dust collector 10 in the exhaust gas path 5. The shutoff valve 9 allows or blocks the flow of the uncollected exhaust gas to the dust collector 10 by opening and closing a portion of the dust exhaust path 5 that communicates with the dust collector 10. Specifically, the shut-off valve 9 shuts off the flow of the uncollected exhaust gas to the dust collector 10 only when the dust collector 10 and the like are started up or maintained. On the other hand, the shut-off valve 9 keeps the dust-collecting exhaust gas path 5 open during the period other than this period, that is, a period in which uncollected exhaust gas from the coke oven 2 is to be collected and discharged from the chimney 6. Allow the flow of uncollected exhaust gas to the

集塵機１０は、コークス炉２からの未集塵排ガスを集塵処理する装置である。具体的には、集塵機１０は、電気集塵機又はバグフィルタ等を用いて実現され、遮断弁９と吸引送風機１１との間に配置されている。集塵機１０は、煙道３の分岐部分から集塵排ガス経路５内に流入した未集塵排ガスを集塵処理することによって、未集塵排ガスに含まれる煤塵を除去する。この結果、集塵機１０は、コークス炉２からの未集塵排ガスから煤塵を除去した排ガス、すなわち集塵排ガスを生成する。 The dust collector 10 is a device that performs a dust collection process on uncollected exhaust gas from the coke oven 2. Specifically, the dust collector 10 is realized using an electric dust collector, a bag filter, or the like, and is disposed between the shutoff valve 9 and the suction blower 11. The dust collector 10 removes dust contained in the uncollected exhaust gas by performing a dust collection process on the uncollected exhaust gas that has flowed into the exhaust gas path 5 from the branch portion of the flue 3. As a result, the dust collector 10 generates an exhaust gas from which dust has been removed from the uncollected exhaust gas from the coke oven 2, that is, a dust exhaust gas.

吸引送風機１１は、従来の集塵処理に用いられる従来の吸引送風機に比して強力な吸引機能を有するものであり、集塵排ガス経路５のうちの集塵機１０の後段に配置されている。吸引送風機１１は、集塵排ガス経路５に沿って未集塵排ガスをコークス炉２側から集塵機１０へ流通させると共に、吐出ダクト５ｂを介して集塵機１０から煙突６内の所定部位に向けて集塵排ガスを流通させる。 The suction blower 11 has a stronger suction function than the conventional suction blower used for the conventional dust collection processing, and is arranged in the dust collection exhaust gas path 5 after the dust collector 10. The suction blower 11 distributes the uncollected exhaust gas from the coke oven 2 to the dust collector 10 along the exhaust gas path 5 and collects the dust from the dust collector 10 toward a predetermined portion in the chimney 6 through the discharge duct 5b. Discharge exhaust gas.

〔吸引ダクト及び吐出ダクトの構成〕
次に、図２〜図９を参照して、上記集塵排ガス経路５における吸引ダクト５ａ及び吐出ダクト５ｂの構成について詳しく説明する。 [Structure of suction duct and discharge duct]
Next, the configurations of the suction duct 5a and the discharge duct 5b in the dust collection exhaust gas path 5 will be described in detail with reference to FIGS.

図２（ａ），（ｂ）はそれぞれ、吸引ダクト５ａ及び吐出ダクト５ｂの構成を説明するための平面図及び側面図である。図２（ａ），（ｂ）に示すように、本実施形態では、吸引ダクト５ａは、煙道３から鉛直上方に分岐して未集塵排ガスを吸引する。吸引ダクト５ａが鉛直上方に分岐する理由は、煙道３が盛り土によって地表レベルよりも少なくとも煙道３の高さ分高くなっており、吸引ダクト５ａを水平方向に分岐させると、盛り土を掘って吸引ダクト５ａを埋設することになり、施工費用が増大するためである。そして、未集塵排ガスは例えば２３０℃の高温になりうるのに対して、集塵機１０の耐熱温度は例えば２００℃であるため、大気圧よりも低い吸引ダクト５ａ内の圧力を利用して、外気導入弁１２から大気温度の空気を吸い込ませて未集塵排ガスの温度を集塵機１０の耐熱温度以下にしている。 FIGS. 2A and 2B are a plan view and a side view, respectively, for explaining the configuration of the suction duct 5a and the discharge duct 5b. As shown in FIGS. 2A and 2B, in this embodiment, the suction duct 5a branches vertically upward from the flue 3 and sucks uncollected exhaust gas. The reason for the suction duct 5a branching vertically upward is that the flue 3 is raised at least by the height of the flue 3 above the ground level due to the embankment, and when the suction duct 5a is branched in the horizontal direction, the embankment is dug. This is because the suction duct 5a is buried, which increases the construction cost. The uncollected exhaust gas can have a high temperature of, for example, 230 ° C., whereas the heat-resistant temperature of the dust collector 10 is, for example, 200 ° C. Air at the atmospheric temperature is sucked from the introduction valve 12 so that the temperature of the uncollected exhaust gas is lower than the heat-resistant temperature of the dust collector 10.

外気と合流した未集塵排ガスは、集塵機１０を通過して、煤塵を除去された集塵排ガスとなり、吸引送風機１１に吸引される。吸引送風機１１のファンは回転体であるため、吸引送風機１１は共振を防止するために地表レベルの強固な基礎上の架構に設置されている。吸引送風機１１の吐出口は、地表近くを通る吐出ダクト５ｂに接続され、煙突６へと導かれる。ここで、煙道３から集塵機１０に吸引される未集塵排ガス量がコークス炉２から排出される排ガス量を下回ると、その差が未集塵排ガス経路４を通って煙突６から排出されるため、煤塵の混じった排ガスが黒煙として見える可能性がある。 The uncollected exhaust gas that has merged with the outside air passes through the dust collector 10, becomes dust exhaust gas from which dust has been removed, and is sucked by the suction blower 11. Since the fan of the suction blower 11 is a rotating body, the suction blower 11 is installed on a frame on a solid foundation at the ground level to prevent resonance. The discharge port of the suction blower 11 is connected to a discharge duct 5 b passing near the ground surface, and is led to the chimney 6. Here, when the amount of uncollected exhaust gas sucked from the stack 3 to the dust collector 10 is smaller than the amount of exhaust gas discharged from the coke oven 2, the difference is discharged from the chimney 6 through the uncollected exhaust gas path 4. Therefore, the exhaust gas mixed with the dust may be seen as black smoke.

このため、煙道３から集塵機１０に吸引される未集塵排ガス量はコークス炉２から排出される排ガス量以上となるよう余裕を持って設定されている。ところが、煙道３から集塵機１０に吸引される未集塵排ガス量とコークス炉２からの排ガス量との差は、集塵排ガスが未集塵排ガス経路４を逆流して未集塵排ガスが順流してくることを阻止するが、未集塵排ガスの逆流量を多くすることは集塵機１０の容量を大きく設計することに他ならない。このため、煙道３から集塵機１０に吸引される未集塵排ガス量とコークス炉２からの排ガス量との差は、経済的にはできるだけ少なくすることが望ましく、未集塵排ガス量の３〜５％の範囲内とすることが望ましい。 For this reason, the amount of uncollected exhaust gas sucked from the flue 3 to the dust collector 10 is set with a margin so as to be equal to or more than the amount of exhaust gas discharged from the coke oven 2. However, the difference between the amount of uncollected exhaust gas sucked from the flue 3 to the dust collector 10 and the amount of exhaust gas from the coke oven 2 is that the exhaust gas flows back through the uncollected exhaust gas path 4 and the uncollected exhaust gas flows forward. Although it is prevented from flowing, increasing the reverse flow rate of the uncollected exhaust gas is nothing but designing a large capacity of the dust collector 10. For this reason, the difference between the amount of uncollected exhaust gas sucked from the flue 3 into the dust collector 10 and the amount of exhaust gas from the coke oven 2 is desirably economically reduced as much as possible. It is desirable to be within the range of 5%.

煙突６は円筒状の鉄筋コンクリート製で高さが１２０ｍあり、地震等によって転倒しないようにその最下部は強固な構造を有している。このため、煙突６の下部に吐出ダクト５ｂを接続する場合でも、接続位置は最下部を避け地表から１０ｍの高さとしている。このような背景から、吐出ダクト５ｂには地表近くから煙突６の接続口まで鉛直方向に立ち上がる部分が存在している。また、コークス炉２への燃焼用空気の供給は、煙突６に生じるドラフトによってなされており、吸引送風機１１により強制通気する集塵排ガス経路５内の流速よりも未集塵排ガス経路４内の流速を小さくする必要がある。このため、未集塵排ガス経路４の断面積は集塵排ガス経路５の断面積より大きくなっている。 The chimney 6 is made of cylindrical reinforced concrete, has a height of 120 m, and has a strong lowermost part so that it does not fall down due to an earthquake or the like. Therefore, even when the discharge duct 5b is connected to the lower part of the chimney 6, the connection position is set at a height of 10 m from the ground surface, avoiding the lowermost part. From such a background, the discharge duct 5b has a portion that rises in the vertical direction from near the ground surface to the connection port of the chimney 6. The supply of combustion air to the coke oven 2 is performed by a draft generated in the chimney 6, and the flow rate in the uncollected exhaust gas path 4 is higher than the flow rate in the dust collection exhaust gas path 5 forcibly ventilated by the suction blower 11. Need to be smaller. For this reason, the cross-sectional area of the uncollected exhaust gas path 4 is larger than the cross-sectional area of the dust-collected exhaust gas path 5.

図３（ａ），（ｂ）はそれぞれ、吐出ダクト５ｂの構成を示す鉛直方向断面図及び水平方向断面図である。図３（ａ），（ｂ）に示すように、吐出ダクト５ｂは、煙突６の側面に略水平方向から接続する水平部５ｂ１と、水平部５ｂ１より排ガスの流れ方向上流側において略鉛直方向に立ち上がる鉛直部５ｂ２と、水平部５ｂ１と鉛直部５ｂ２とを接続する屈曲構造を有するベンド部５ｂ３と、を備えている。ベンド部５ｂ３内には、３枚の案内板１３が設けられている。各案内板１３は、ベンド部５ｂ３の屈曲中心と略同じ屈曲中心を有する屈曲構造を有し、ベンド部５ｂ３の内半径と外半径とを等比に分割する位置に配置されている。これにより、案内板１３によって分割された集塵排ガス経路５は相似形となり、効率よく集塵排ガスの流れを直角に曲げることができる。本実施形態では、案内板１３は複数枚設けられているが、本発明は本実施形態に限定されることはなく、案内板１３の枚数は１枚であってもよい。 FIGS. 3A and 3B are a vertical sectional view and a horizontal sectional view showing the configuration of the discharge duct 5b, respectively. As shown in FIGS. 3 (a) and 3 (b), the discharge duct 5b has a horizontal portion 5b1 connected to the side surface of the chimney 6 from a substantially horizontal direction, and a substantially vertical direction upstream of the horizontal portion 5b1 in the exhaust gas flow direction. It has a vertical part 5b2 that rises, and a bend part 5b3 having a bent structure that connects the horizontal part 5b1 and the vertical part 5b2. Three guide plates 13 are provided in the bend portion 5b3. Each guide plate 13 has a bending structure having a bending center substantially the same as the bending center of the bend portion 5b3, and is arranged at a position that divides the inner radius and the outer radius of the bend portion 5b3 at an equal ratio. Thus, the exhaust gas path 5 divided by the guide plate 13 has a similar shape, and the flow of the exhaust gas can be efficiently bent at a right angle. In the present embodiment, a plurality of guide plates 13 are provided, but the present invention is not limited to this embodiment, and the number of guide plates 13 may be one.

また、案内板１３のガス流れ方向下流側には、水平方向に伸びる平板部１３ａが設けられており、この平板部１３ａによって集塵排ガスの流れを整えている。また、吐出ダクト５ｂの出側開口部（吐出口）には、それぞれの開き角度が６°の分散板１４が１１枚設けられており、全体で６０°に開くようにしている。分散板１４間の開き角度が６°よりも大きい場合、分散板１４の間で集塵排ガスの流れが剥離して偏流が生じる結果、分散板１４の効果が不十分となる。また、分散板１４間の開き角度が６°よりも小さい場合には、同じ６０°の開き角度を得るのに、分散板１４の枚数が増えて不経済となる上に、分散板１４の表面の摩擦によって圧力損失が大きくなる。なお、本実施形態では、案内板１３と分散板１４とを吐出ダクト５ｂに設けることとしたが、案内板１３及び分散板１４の一方のみを吐出ダクト５ｂに設けるようにしてもよい。 Further, a flat plate portion 13a extending in the horizontal direction is provided on the downstream side of the guide plate 13 in the gas flow direction, and the flow of the collected exhaust gas is regulated by the flat plate portion 13a. In addition, at the outlet side opening (discharge port) of the discharge duct 5b, there are provided 11 dispersion plates 14 each having an opening angle of 6 °, so that the dispersion plates 14 can be opened at 60 ° as a whole. If the opening angle between the dispersion plates 14 is larger than 6 °, the flow of the dust collection exhaust gas is separated between the dispersion plates 14 and a drift occurs, so that the effect of the dispersion plates 14 becomes insufficient. Further, when the opening angle between the dispersion plates 14 is smaller than 6 °, the same opening angle of 60 ° is obtained, which increases the number of the dispersion plates 14 and is uneconomical. The pressure loss increases due to the friction of. In the present embodiment, the guide plate 13 and the dispersion plate 14 are provided in the discharge duct 5b. However, only one of the guide plate 13 and the dispersion plate 14 may be provided in the discharge duct 5b.

図４は、流体解析によって求められた、図３（ａ），（ｂ）に示す吐出ダクト５ｂの構成における煙突６の鉛直方向断面内での集塵排ガスの速度分布を示す。図４において、矢印の方向は集塵排ガスの流れ方向、矢印の長さは集塵排ガスの速度を示している。図４に示すように、吐出ダクト５ｂの接続部Ｒ１において集塵排ガスは略均一な流速分布を示しており、煙突６内に吐出された集塵排ガスの主流が煙突６の正面内壁６ａに到達している。これにより、集塵排ガスの流れを横断して未処理排ガスが煙突６の上方に漏洩できなくなるので、未処理排ガスを遮断することができる。 FIG. 4 shows the velocity distribution of the collected exhaust gas in the vertical section of the chimney 6 in the configuration of the discharge duct 5b shown in FIGS. 3A and 3B, obtained by the fluid analysis. In FIG. 4, the direction of the arrow indicates the flow direction of the collected exhaust gas, and the length of the arrow indicates the speed of the collected exhaust gas. As shown in FIG. 4, the exhaust gas at the connection R1 of the discharge duct 5b has a substantially uniform flow velocity distribution, and the main flow of the exhaust gas discharged into the chimney 6 reaches the front inner wall 6a of the chimney 6. are doing. As a result, the untreated exhaust gas cannot leak above the chimney 6 across the flow of the collected exhaust gas, so that the untreated exhaust gas can be shut off.

これに対して、図５は、流体解析によって求められた、案内板１３及び分散板１４のない吐出ダクト５ｂの構成における煙突６の鉛直方向断面内での集塵排ガスの速度分布を示す。図５において、矢印の方向は集塵排ガスの流れ方向、矢印の長さは集塵排ガスの速度を示している。図５に示すように、案内板１３及び分散板１４がない場合、吐出ダクト５ｂの接続部Ｒ２で集塵排ガスの流れが上方に偏り、吐出後もその傾向が維持されるため、煙突６の正面内壁６ａに集塵排ガスの主流が到達していない。この場合は、煙突６内に存在している未処理排ガスが煙突６の上方に漏洩する可能性があり、煙突６からの排ガスに黒煙として混じりこむので、付近の住民に不快感を与えることがありえる。 On the other hand, FIG. 5 shows the velocity distribution of the collected exhaust gas in the vertical section of the chimney 6 in the configuration of the discharge duct 5b without the guide plate 13 and the dispersion plate 14, obtained by the fluid analysis. In FIG. 5, the direction of the arrow indicates the flow direction of the collected exhaust gas, and the length of the arrow indicates the speed of the collected exhaust gas. As shown in FIG. 5, when the guide plate 13 and the dispersion plate 14 are not provided, the flow of the dust collection exhaust gas is biased upward at the connection portion R2 of the discharge duct 5b, and the tendency is maintained after the discharge. The main flow of the exhaust gas does not reach the front inner wall 6a. In this case, the untreated exhaust gas present in the chimney 6 may leak above the chimney 6 and mix with the exhaust gas from the chimney 6 as black smoke, which may cause discomfort to the local residents. There can be.

図６（ａ），（ｂ）はそれぞれ、図３（ａ），（ｂ）に示す吐出ダクト５ｂの変形例の構成を示す鉛直方向断面図及び水平方向断面図である。図６（ａ），（ｂ）に示す変形例では、分散板１４の箇所において吐出ダクト５ｂの吐出口５ｂ４をガス流れ方向上流側からガス流れ方向下流側に向けて絞っている。図７は、流体解析によって求められた、図６（ａ），（ｂ）に示す吐出ダクト５ｂの構成における煙突６の鉛直方向断面内での集塵排ガスの速度分布を示す図である。図７において、矢印の方向は集塵排ガスの流れ方向、矢印の長さは集塵排ガスの速度を示している。図７に示すように、図６（ａ），（ｂ）に示す吐出ダクト５ｂの構成によれば、水平方向に吐出される集塵排ガスの流速を速めることができるので、煙突６内に吐出された集塵排ガスの主流が煙突６の正面内壁６ａにより大きな流速をもって衝突し、図３（ａ），（ｂ）に示す吐出ダクト５ｂの形状よりも未処理排ガスの漏洩防止効果を大きくすることができる。 FIGS. 6A and 6B are a vertical sectional view and a horizontal sectional view, respectively, showing a configuration of a modified example of the discharge duct 5b shown in FIGS. 3A and 3B. In the modification shown in FIGS. 6A and 6B, the discharge port 5b4 of the discharge duct 5b is narrowed from the upstream side in the gas flow direction to the downstream side in the gas flow direction at the location of the dispersion plate 14. FIG. 7 is a diagram showing a velocity distribution of the collected exhaust gas in the vertical cross section of the chimney 6 in the configuration of the discharge duct 5b shown in FIGS. 6A and 6B, obtained by the fluid analysis. In FIG. 7, the direction of the arrow indicates the flow direction of the collected exhaust gas, and the length of the arrow indicates the speed of the collected exhaust gas. As shown in FIG. 7, according to the configuration of the discharge duct 5 b shown in FIGS. 6A and 6B, the flow rate of the dust exhaust gas discharged in the horizontal direction can be increased, so that the exhaust gas is discharged into the chimney 6. The main flow of the collected exhaust gas collides with the front inner wall 6a of the chimney 6 with a large flow velocity, and the leakage prevention effect of the untreated exhaust gas is greater than the shape of the discharge duct 5b shown in FIGS. 3 (a) and 3 (b). Can be.

なお、本実施形態では、分散板１４の入側断面積と出側断面積とが等しくなるように吐出ダクト５ｂの吐出口５ｂ４を絞っている。このため、分散板１４の間での集塵排ガスの流速は入側から出側にわたってほぼ一定であり、減速による集塵排ガスの流れの剥離や加速による圧損の増大を防止できる。具体的には、本実施形態では、内直径６．２ｍ、断面積３０．２ｍ²の煙突６に対して、分散板１４の幅は入側から出側に向けて１．９ｍから２．２ｍに広げつつ、高さは入側から出側に向けて１．６ｍから１．３６ｍに狭めることにより、分散板１４の断面積を３．０ｍ²と一定としている。 In the present embodiment, the outlet 5b4 of the discharge duct 5b is narrowed so that the cross-sectional area on the inlet side and the cross-sectional area on the outlet side of the dispersion plate 14 are equal. For this reason, the flow rate of the exhaust gas between the dispersion plates 14 is substantially constant from the entrance side to the exit side, and separation of the flow of the exhaust gas due to deceleration and increase in pressure loss due to acceleration can be prevented. Specifically, in the present embodiment, for the chimney 6 having an inner diameter of 6.2 m and a cross-sectional area of 30.2 m ² , the width of the dispersion plate 14 is from 1.9 m to 2.2 m from the entrance side to the exit side. The height of the dispersion plate 14 is reduced from 1.6 m to 1.36 m from the entrance side to the exit side while keeping the cross-sectional area of the dispersion plate 14 constant at 3.0 m ² .

以上の実施形態では、案内板１３と分散板１４の両方が設置された例について説明したが、案内板１３のみでも図４に示す領域Ｒ１では流れが均一になっており、未集塵ガスの漏洩防止効果を発揮できる。また、分散板１４のみでも集塵排ガスは煙突６内で水平方向に広がるので、未集塵ガスの漏洩防止効果を発揮できる。 In the above embodiment, an example in which both the guide plate 13 and the dispersion plate 14 are provided has been described. However, even with the guide plate 13 alone, the flow is uniform in the region R1 shown in FIG. Leak prevention effect can be exhibited. Further, since the collected exhaust gas spreads in the chimney 6 in the horizontal direction only with the dispersion plate 14, the effect of preventing leakage of the uncollected gas can be exhibited.

また、特に未集塵排ガスが集塵排ガスよりも高温である場合、集塵排ガス中を未集塵排ガスが上昇する浮力が発生し、煙突単位断面積当たりに作用する浮力は、未集塵排ガス経路４が煙突６に接続する高さ位置と吐出ダクト５ｂが煙突６に接続する高さ位置との高低差が１０ｍである場合、４．６Ｐａの圧力に相当する。この４．６Ｐａの圧力は、２００℃の集塵排ガス密度(０．７７８ｋｇ／ｍ³)と２３０℃の未集塵排ガス密度(０．７３１ｋｇ／ｍ³)との差(０．０４７ｋｇ／ｍ³)に重力加速度(９．８ｍ／ｓ²)と高低差(１０ｍ)を乗じて算出したものである。吐出ダクト５ｂの吐出口５ｂ４を絞らない場合、集塵排ガスの吐出流速は１６．１ｍ／ｓ、その単位時間当たりの運動量は７１０Ｎであり、集塵排ガスの吐出流が煙突６の断面積に均一に作用した場合の圧力は２３．７Ｐａと浮力の５．２倍となる。この単位時間当たりの運動量は、吐出流速に集塵排ガスの流量(５６．７ｍ³／ｓ)と集塵排ガス密度を乗じて求まり、その圧力への換算は煙突の断面積(２９．９ｍ²)で除して行ったものである。ところが、分散板１４によっても集塵排ガスの吐出流を煙突６の断面に均一には作用させることができないので、未集塵排ガスの逆流量が未集塵排ガス量の５％のときに未集塵排ガスの漏洩が１．０％存在する流体解析結果であった。これに対して、吐出ダクト５ｂの吐出口５ｂ４を絞った場合には、集塵排ガスの吐出流速は１９．０ｍ／ｓに高まり、その単位時間当たりの運動量も８３８Ｎになり、それを煙突６の断面積で除した値は２８.０Ｐａと煙突単位断面積当たりの浮力の６．１倍になり、未集塵排ガスの漏洩をゼロにすることができた。 In addition, especially when the uncollected exhaust gas has a higher temperature than the collected exhaust gas, the buoyancy that the uncollected exhaust gas rises in the collected exhaust gas is generated, and the buoyancy acting per unit sectional area of the chimney is determined by the uncollected exhaust gas. When the height difference between the height position where the path 4 connects to the chimney 6 and the height position where the discharge duct 5b connects to the chimney 6 is 10 m, this corresponds to a pressure of 4.6 Pa. The pressure of the 4.6Pa, the difference between 200 ° C. dust collecting exhaust gas density Not precipitator exhaust gas density of (0.778kg / m ³⁾ and ^{230 ℃ (0.731kg / m 3)} (0.047kg / m 3 ) Is multiplied by the gravitational acceleration (9.8 m / s ² ) and the height difference (10 m). When the discharge port 5b4 of the discharge duct 5b is not throttled, the discharge flow rate of the dust collection exhaust gas is 16.1 m / s, the momentum per unit time is 710N, and the discharge flow of the dust collection exhaust gas is uniform in the cross-sectional area of the chimney 6. Is 23.7 Pa, which is 5.2 times the buoyancy. The momentum per unit time is obtained by multiplying the discharge flow velocity by the flow rate of the exhaust gas (56.7 m ³ / s) and the density of the exhaust gas, and the pressure is converted into the cross-sectional area of the chimney (29.9 m ² ). Divided by However, since the discharge flow of the collected exhaust gas cannot be uniformly applied to the cross section of the chimney 6 even by the dispersion plate 14, when the reverse flow rate of the uncollected exhaust gas is 5% of the amount of the uncollected exhaust gas, the uncollected exhaust gas is not collected. It was a fluid analysis result in which leakage of dust exhaust gas was present at 1.0%. On the other hand, when the discharge port 5b4 of the discharge duct 5b is narrowed, the discharge flow rate of the collected exhaust gas is increased to 19.0 m / s, and the momentum per unit time is also 838N. The value divided by the cross-sectional area was 28.0 Pa, which was 6.1 times the buoyancy per unit cross-sectional area of the chimney, and the leakage of uncollected exhaust gas could be reduced to zero.

図８（ａ），（ｂ）はそれぞれ、煙道３と吸引ダクト５ａとの接続部分の構成例を示す平面図及び側面図である。図８に示すように、本実施形態では、煙道３は、鉄筋コンクリート製であり、断面形状が幅４５８８ｍｍ、高さ３６３５ｍｍの長方形形状であり、その上部の角には補強用のテーパー部分３ａが存在している。そして、煙道３の長辺である煙道３の幅方向に長辺長３４００ｍｍ、煙道３の短辺である煙道３の軸方向に短辺長１３００ｍｍの開口部３ｂを設けて、開口部３ｂに吸引ダクト５ａを接続している。 FIGS. 8A and 8B are a plan view and a side view showing a configuration example of a connection portion between the flue 3 and the suction duct 5a, respectively. As shown in FIG. 8, in the present embodiment, the flue 3 is made of reinforced concrete, has a rectangular shape having a cross-sectional shape of 4588 mm in width and 3635 mm in height, and has a taper portion 3a for reinforcement at the upper corner. Existing. An opening 3b having a long side length of 3400 mm in the width direction of the flue 3 which is a long side of the flue 3 and a short side length of 1300 mm in the axial direction of the flue 3 which is a short side of the flue 3 is provided. The suction duct 5a is connected to the portion 3b.

一般的に、煙道３のような大きい断面積の流路から吸引ダクト５ａのような小さい断面積の流路に分岐する場合、その分岐部に生じる圧力損失を抑制するために、吸引ダクト５ａ内の流速よりも開口部３ｂにおける平均流速を小さく設計する必要がある。そこで、本実施形態では、開口部３ｂにおける平均流速が１５ｍ／ｓ以下になるよう、開口部３ｂの面積を４．４ｍ²とし、開口部３ｂの形状としては、周長をできるだけ小さくするために例えば一辺２．１ｍの正方形とすることも可能であった。しかしながら、開口部３ｂの形状を正方形に近い形状にした場合には、煙道３の幅に対して吸引する開口部３ｂの幅が半分以下であり、吸引されない特に上部の両隅に未集塵排ガスの淀んだ部分が存在し、煙道３の上面に沿って未集塵排ガスが煙突６内に流入する。このため、未集塵排ガスの逆流量が小さい未集塵排ガス量の３％である場合、未集塵排ガスの漏洩が２．０％存在する流体解析結果であった。 In general, when branching from a flow path having a large cross-sectional area such as the flue 3 to a flow path having a small cross-sectional area such as the suction duct 5a, the suction duct 5a is controlled in order to suppress a pressure loss occurring at the branch. It is necessary to design the average flow velocity in the opening 3b to be smaller than the internal flow velocity. Therefore, in the present embodiment, the area of the opening 3b is set to 4.4 m ² so that the average flow velocity in the opening 3b is 15 m / s or less, and the shape of the opening 3b is to minimize the circumferential length. For example, a square having a side of 2.1 m could be used. However, when the shape of the opening 3b is close to a square, the width of the opening 3b to be sucked is less than half of the width of the flue 3, and uncollected dust is not particularly collected at both upper corners. There is a stagnant portion of the exhaust gas, and uncollected exhaust gas flows into the chimney 6 along the upper surface of the flue 3. Therefore, when the reverse flow rate of the uncollected exhaust gas is 3% of the small amount of the uncollected exhaust gas, the fluid analysis result shows that 2.0% of the leakage of the uncollected exhaust gas exists.

そこで、煙道３内の未集塵排ガスを満遍なく吸引できるように、煙道３の上部の角には補強用のテーパー部３ａを避けるという、構造上の制約範囲内で煙道３の幅に近い開口として煙道３の幅の７４％である３．４ｍまで広げて、その面積を前述のとおり４．４ｍ²とした場合に開口の奥行きは１．３ｍとした。その場合には、未集塵排ガスの逆流量が小さい未集塵排ガス量の３％である場合でも、未集塵排ガスの漏洩をゼロにすることができた。 Therefore, in order to be able to evenly suck the uncollected exhaust gas in the flue 3, the upper corner of the flue 3 should not have a tapered portion 3 a for reinforcement. The depth of the opening was 1.3 m when the area was set to 4.4 m ² as described above, which was expanded to 3.4 m which is 74% of the width of the flue 3 as a close opening. In that case, even when the reverse flow rate of the uncollected exhaust gas was 3% of the small amount of the uncollected exhaust gas, the leakage of the uncollected exhaust gas could be reduced to zero.

図９（ａ），（ｂ）はそれぞれ、煙道３と吸引ダクト５ａとの接続部分の変形例の構成を示す平面図及び側面図である。図９（ａ），（ｂ）に示す変形例は、前述の鉄筋コンクリート製の煙道３の中に、コンクリート表面保護のためにレンガを用いてアーチ式の煙道３ｃを構成した場合の煙道３と吸引ダクト５ａとの接続部分の形態である。アーチ式の煙道３ｃは鉄筋コンクリート製の煙道３の天井よりも低いため、前述の開口部３ｂと同じ断面で吸引ダクト５ａからアーチ式の煙道３ｃの天井まで差込口５ａ１を伸ばして接続している。この場合には、吸引ダクトへ５ａの開口は同じ形状のままで、アーチ式の煙道３ｃにより煙道３の幅が３９８８ｍｍまで狭まっている。このため、開口幅の割合が８５％まで向上すると共に、煙道３の上面の開口部３ｂ以外の部分が傾斜しているので、その面に沿って未集塵排ガスの淀んだ部分が存在しなくなり、この場合にも未集塵排ガスの漏洩を有効に防止することができた。 FIGS. 9A and 9B are a plan view and a side view, respectively, showing a configuration of a modified example of a connection portion between the flue 3 and the suction duct 5a. 9 (a) and 9 (b) show a flue in which an arch-type flue 3c is formed by using bricks to protect the concrete surface in the above-mentioned flue 3 made of reinforced concrete. 3 shows a form of a connection portion between the suction duct 3 and the suction duct 5a. Since the arch-type flue 3c is lower than the ceiling of the reinforced concrete flue 3, the outlet 5a1 is extended from the suction duct 5a to the ceiling of the arch-type flue 3c and connected with the same cross section as the above-mentioned opening 3b. are doing. In this case, the width of the flue 3 is reduced to 3988 mm by the arched flue 3c, while the opening of the suction duct 5a remains in the same shape. For this reason, the ratio of the opening width is improved to 85%, and since the portion other than the opening 3b on the upper surface of the flue 3 is inclined, there is a portion where the uncollected exhaust gas stagnates along the surface. In this case as well, the leakage of uncollected exhaust gas could be effectively prevented.

以上、本発明者によってなされた発明を適用した実施形態について説明したが、本実施形態による本発明の開示の一部をなす記述及び図面により本発明は限定されることはない。すなわち、本実施形態に基づいて当業者等によりなされる他の実施形態、実施例、及び運用技術等は全て本発明の範疇に含まれる。 As described above, the embodiment to which the invention made by the inventor is applied has been described. However, the present invention is not limited by the description and the drawings that form part of the disclosure of the present invention according to the present embodiment. That is, other embodiments, examples, operation techniques, and the like performed by those skilled in the art based on this embodiment are all included in the scope of the present invention.

１コークス炉の排ガス処理装置
２コークス炉
３煙道
４未集塵排ガス経路
５集塵排ガス経路
５ａ吸引ダクト
５ｂ吐出ダクト
５ｂ１水平部
５ｂ２鉛直部
５ｂ３ベンド部
５ｂ４吐出口
１３案内板
１４分散板 DESCRIPTION OF SYMBOLS 1 Exhaust gas processing apparatus of coke oven 2 Coke oven 3 Flue 4 Uncollected exhaust gas path 5 Dust collection exhaust gas path 5a Suction duct 5b Discharge duct 5b1 Horizontal section 5b2 Vertical section 5b3 Bend section 5b4 Discharge port 13 Guide plate 14 Dispersion plate

Claims

A flue, provided in the horizontal direction, to which the exhaust gas discharged from the coke oven is supplied,
An uncollected exhaust gas path that branches off from the stack and introduces the exhaust gas at a first height position of a chimney vertically erected,
A suction duct that branches from the flue to suck the exhaust gas, a dust collector that collects the exhaust gas sucked by the suction duct, and an exhaust gas that is collected by the dust collector is higher than the first height position. A dust collection exhaust path having a discharge duct that is introduced at a second height position of the chimney;
In a coke oven exhaust gas treatment device comprising:
The exhaust gas treatment device is operated in a state where the uncollected exhaust gas path is open,
The amount of exhaust gas sucked into the suction duct is equal to or more than the amount of exhaust gas discharged from the coke oven,
The discharge duct includes a horizontal portion connected to the side surface of the chimney from a substantially horizontal direction, a vertical portion rising substantially vertically on the upstream side in the exhaust gas flow direction from the horizontal portion, and the horizontal portion and the vertical portion. A bend portion having a bent structure for connection,
Inside the discharge port of the discharge duct , a plurality of dispersion plates are installed at a specific opening angle so that the collected exhaust gas discharged from the discharge port spreads horizontally , Exhaust gas treatment equipment.

A flue provided with exhaust gas discharged from a coke oven provided in a horizontal direction,
An uncollected exhaust gas path that branches off from the stack and introduces the exhaust gas at a first height position of a chimney vertically erected,
A suction duct that branches from the flue to suck the exhaust gas, a dust collector that collects the exhaust gas sucked by the suction duct, and an exhaust gas that is collected by the dust collector is higher than the first height position. A dust collection exhaust path having a discharge duct that is introduced at a second height position of the chimney;
In a coke oven exhaust gas treatment device comprising:
The exhaust gas treatment device is operated in a state where the uncollected exhaust gas path is open,
The amount of exhaust gas sucked into the suction duct is equal to or more than the amount of exhaust gas discharged from the coke oven,
The discharge duct includes a horizontal portion connected to the side surface of the chimney from a substantially horizontal direction, a vertical portion rising substantially vertically on the upstream side in the exhaust gas flow direction from the horizontal portion, and the horizontal portion and the vertical portion. A bend portion having a bent structure for connection,
In the bend portion, one or more guide plates having a bending structure having a bending center substantially the same as the bending center of the bend portion are provided along the radial direction of the bend portion,
Inside the discharge port of the discharge duct , a plurality of dispersion plates are installed at a specific opening angle so that the collected exhaust gas discharged from the discharge port spreads in the horizontal direction . Exhaust gas treatment equipment.

The cross-sectional shape of the discharge port of the discharge duct is a substantially rectangular shape in which the length of a horizontal side is longer than the length of a vertical side, and the discharge port of the discharge duct is the exhaust gas at a location where the dispersion plate is installed. The exhaust gas treatment device for a coke oven according to claim 1 or 2 , wherein the exhaust gas is narrowed in a vertical direction from an upstream side in a flow direction to a downstream side in a flow direction.

The temperature of the exhaust gas discharged from the discharge duct after the dust collection process is lower than the temperature of the exhaust gas that has not been subjected to the dust collection process flowing through the flue, and is a unit time of the exhaust gas discharged from the discharge duct after the dust collection process. The value obtained by dividing the momentum per unit by the cross-sectional area of the chimney is the difference between the temperature of the exhaust gas not subjected to dust collection processing and the temperature of the exhaust gas after dust collection processing, and the height position of the stack and the discharge port of the discharge duct. The exhaust gas treatment apparatus for a coke oven according to any one of claims 1 to 3 , wherein the pressure is at least six times the pressure due to buoyancy generated by the height position and the difference.

Cross-sectional shape of the flue at the connection point between the suction duct has a substantially rectangular shape, the opening of the suction duct in the connecting portion between the flue rather long in the long sides of the cross-sectional shape of the flue, The opening of the said suction duct in the connection point with the said flue is provided so that it may become parallel with the long side in the cross-sectional shape of the said flue , The any one of Claims 1-4 characterized by the above-mentioned. Item 7. An exhaust gas treatment device for a coke oven according to item 9.

The cross-sectional shape of the flue in the connecting portion between the suction duct is substantially semicircular shape, the opening of the suction duct in the connecting portion between the flue rather long diameter side of the cross-sectional shape of the flue, of claims 1-4 opening of the suction duct in the connecting portion between the flue, characterized in that is provided so as to be parallel to the diameter of the cross-sectional shape of the flue, any one An exhaust gas treatment device for a coke oven according to claim 1.

The exhaust gas treating apparatus for a coke oven according to claim 5 or 6 , wherein a width of an opening of the suction duct at a connection point with the flue is 70% or more of a cross-sectional width of the flue.