JP4772475B2

JP4772475B2 - Exhaust gas recovery device and control method thereof

Info

Publication number: JP4772475B2
Application number: JP2005339312A
Authority: JP
Inventors: 健関; 一良藤井; 渉永井; 和久福田
Original assignee: Nippon Steel Corp
Current assignee: Nippon Steel Corp
Priority date: 2005-11-24
Filing date: 2005-11-24
Publication date: 2011-09-14
Anticipated expiration: 2025-11-24
Also published as: JP2007146197A

Description

本発明は，微粉炭を燃焼させて原料を溶解する溶解炉から，排出された排ガスを回収する排ガス回収装置とその制御方法に関する。 The present invention relates to an exhaust gas recovery apparatus that recovers exhaust gas discharged from a melting furnace that burns pulverized coal to melt raw materials, and a control method thereof.

製鉄設備において，発生する排ガスを回収し，再利用する技術は公知である。例えば，特許文献１には，転炉内の二酸化炭素を水素ガスによってガスカロリーが高い一酸化炭素に還元して，転炉に連通するガス管路から回収する方法が開示されている。 Techniques for recovering and reusing generated exhaust gas in steelmaking facilities are well known. For example, Patent Document 1 discloses a method in which carbon dioxide in a converter is reduced to carbon monoxide having a high gas calorie with hydrogen gas and recovered from a gas pipe communicating with the converter.

また，上述のように排ガスを回収する際に，排ガスの流量を制御する技術も，公知である。例えば，特許文献２には，排ガスを，サクションダンパを介して通風機で吸い込み，昇圧してから，コントロールダンパで流量を制御しながら排出するガス流量制御システムが開示されている。 A technique for controlling the flow rate of exhaust gas when recovering exhaust gas as described above is also known. For example, Patent Document 2 discloses a gas flow rate control system in which exhaust gas is sucked with a ventilator through a suction damper, boosted, and discharged while controlling the flow rate with a control damper.

特開２００３−１６６０１３号公報Japanese Patent Laid-Open No. 2003-166013 特開２００１−２１６０３０号公報Japanese Patent Laid-Open No. 2001-2116030

しかしながら，従来の排ガスの流量制御は，コントロールダンパに供給される排ガスの流量又はコントロールダンパの圧力差を測定してから，その測定結果に基づいて排ガスの流量を制御する後追い式のフィードバック制御である。従って，連続的に吹込まれる微粉炭等を燃焼させ，投入された原料を溶解する転炉等の溶解炉に対して，従来の排ガスの流量制御技術を適用すると，原料を転炉に投入する際に排ガスの流量が瞬間的に変動した場合に，これに対応した排ガスの流量制御が行われる前に炉口から排ガスが噴出してしまう。 However, the conventional exhaust gas flow rate control is a follow-up feedback control that measures the flow rate of exhaust gas supplied to the control damper or the pressure difference of the control damper and then controls the flow rate of the exhaust gas based on the measurement result. . Therefore, if conventional exhaust gas flow control technology is applied to a melting furnace such as a converter that burns pulverized coal that is continuously injected and melts the charged raw material, the raw material is input to the converter. When the flow rate of the exhaust gas fluctuates momentarily, the exhaust gas is ejected from the furnace port before the exhaust gas flow rate control corresponding to this is performed.

さらに，上記溶解炉において，微粉炭の吹込みを一時停止する場合，従来の排ガスの流量制御では，溶解炉内の一酸化炭素濃度の低下や，酸素濃度の上昇が生じ，一時的に回収する排ガスの性状を悪化させてしまう。 Furthermore, when the pulverized coal injection is temporarily stopped in the above melting furnace, the conventional exhaust gas flow rate control causes a decrease in the carbon monoxide concentration in the melting furnace and an increase in the oxygen concentration, which are temporarily recovered. Exhaust gas properties will be deteriorated.

本発明は上記課題に鑑みてなされたものであり，連続的に吹込まれる微粉炭を燃焼させ，投入された原料を溶解する溶解炉において，原料を投入する際や微粉炭の吹込みを一時停止する際に，従来よりも適切に排ガスの制御を行い，排ガスを安定して回収することが可能な排ガス回収装置とその制御方法を提供することをその目的とする。 The present invention has been made in view of the above problems. In a melting furnace for burning pulverized coal that is continuously blown and melting the charged raw material, the pulverized coal is temporarily blown when the raw material is charged. It is an object of the present invention to provide an exhaust gas recovery device and a control method thereof that can control exhaust gas more appropriately than before and stably recover exhaust gas when stopping.

上記課題を解決するために，本発明によれば，原料を溶解炉にバッチ式に繰り返し投入しつつ，微粉炭を燃焼させて原料を溶解する溶解炉から，排出された排ガスを回収する排ガス回収装置であって，前記溶解炉に連通し，排ガスをガスホルダーに流す流路と，前記流路に設けられ，排ガスの流量を調整する調整弁と，前記流路に設けられ，排ガスの流量を測定する流量計と，前記流量計で測定された排ガスの流量に基づいて，前記調整弁の開度を制御する制御部とを備え，前記制御部は，前記原料が前記溶解炉に供給されるタイミングに基づいて，前記調整弁の開度を増加させるように補正し，且つ前記制御部は，前記溶解炉への微粉炭の供給が途切れるタイミングに基づいて，前記調整弁の開度を減少させるように補正することを特徴とする，排ガス回収装置が提供される。 To solve the above SL problem, according to the present invention, while repeatedly charged into batchwise raw material melting furnace, the melting furnace pulverized coal is burned to dissolve the raw material, to recover the discharged exhaust gas A recovery device that communicates with the melting furnace and flows exhaust gas to the gas holder; a control valve that is provided in the flow channel and adjusts the flow rate of exhaust gas; And a control unit for controlling the opening of the regulating valve based on the flow rate of the exhaust gas measured by the flow meter, wherein the control unit supplies the raw material to the melting furnace. And the control unit reduces the opening of the regulating valve based on the timing when the supply of pulverized coal to the melting furnace is interrupted. It is characterized by correcting so that That, the exhaust gas recovery apparatus is provided.

上記排ガス回収装置において，前記制御部は，前記溶解炉への原料の供給が開始される時点を基準にして定めた所定時間の間，前記調整弁の開度を補正してよい。 In the exhaust gas recovery apparatus, the control unit may correct the opening of the adjusting valve for a predetermined time determined with reference to a point in time when the supply of the raw material to the melting furnace is started.

上記排ガス回収装置において，前記制御部は，前記溶解炉への微粉炭の吹込みが停止する時点を基準にして定めた所定時間の間，前記調整弁の開度を補正してよい。 In the exhaust gas recovery apparatus, the control unit may correct the opening degree of the adjustment valve for a predetermined time set based on a point in time when the pulverized coal injection into the melting furnace stops.

上記排ガス回収装置において，前記原料は，鉄を含有する原料であってもよい。 In the exhaust gas recovery apparatus, the raw material may be a raw material containing iron.

また，上記課題を解決するために，本発明によれば，原料を溶解炉にバッチ式に繰り返し投入しつつ，微粉炭を燃焼させて原料を溶解する溶解炉から，排出された排ガスを回収する排ガス回収装置の制御方法であって，回収する排ガスの流量を測定する工程と，前記測定された排ガスの流量に基づいて，調整弁の開度を制御することにより，回収する排ガスの流量を制御する工程と，前記原料が前記溶解炉に供給されるタイミングに基づいて，前記回収する排ガスの流量が増加されるように，前記制御を補正する工程と，前記溶解炉への微粉炭の供給が途切れるタイミングに基づいて，前記回収する排ガスの流量が減少されるように，前記制御を補正する工程とを有することを特徴とする，排ガス回収装置の制御方法が提供される。 Further, in order to solve the above problems, according to the present invention, exhaust gas discharged from a melting furnace that burns pulverized coal and melts the raw material is recovered while repeatedly charging the raw material into the melting furnace batchwise. A control method for an exhaust gas recovery device, which controls the flow rate of exhaust gas to be recovered by measuring the flow rate of exhaust gas to be recovered and controlling the opening of a regulating valve based on the measured flow rate of exhaust gas. And a step of correcting the control such that the flow rate of the exhaust gas to be recovered is increased based on the timing at which the raw material is supplied to the melting furnace, and supply of pulverized coal to the melting furnace. And a step of correcting the control so that the flow rate of the exhaust gas to be recovered is reduced based on the timing at which the exhaust gas is interrupted.

上記排ガス回収装置の制御方法において，前記制御を補正する工程は，前記溶解炉への原料の供給が開始される時点を基準にして定めた所定時間の間，前記回収する排ガスの流量が増加されるように補正してよい。 In the control method of the exhaust gas recovery apparatus, in the step of correcting the control, the flow rate of the exhaust gas to be recovered is increased for a predetermined time determined with reference to the time when the supply of the raw material to the melting furnace is started. You may correct | amend so that.

上記排ガス回収装置の制御方法において，前記溶解炉への微粉炭の吹込みが停止する時点を基準にして定めた所定時間の間，前記回収する排ガスの流量が減少されるように補正してよい。 In the control method of the exhaust gas recovery apparatus, correction may be made so that the flow rate of the exhaust gas to be recovered is reduced for a predetermined time determined with reference to a point in time when the injection of pulverized coal into the melting furnace stops. .

上記排ガス回収装置の制御方法において，前記原料は，鉄を含有する原料であってもよい。 In the control method of the exhaust gas recovery apparatus, the raw material may be a raw material containing iron.

本発明によれば，連続的に吹込まれる微粉炭を燃焼させ，投入された原料を溶解する溶解炉において，排ガスの流量に基づいて制御することに加えて，更に，原料を投入する際や微粉炭の吹込みを一時停止する際に，適切に排ガスの流量を補正するようにしたので，溶解炉の稼動状況が安定化されると共に，排ガスの回収も安定化される。これにより，回収する排ガスの品質が向上し，排ガスの回収量が増大する。 According to the present invention, in addition to the control based on the flow rate of the exhaust gas in the melting furnace for burning the pulverized coal continuously blown and melting the charged raw material, When the pulverized coal injection is temporarily stopped, the flow rate of the exhaust gas is appropriately corrected, so that the operation status of the melting furnace is stabilized and the recovery of the exhaust gas is also stabilized. This improves the quality of the exhaust gas to be recovered and increases the amount of exhaust gas recovered.

以下，図面を参照しながら，本発明の好適な実施形態について説明をする。なお，本明細書及び図面において，実質的に同一の機能構成を有する要素については，同一の符号を付することにより重複説明を省略する。 Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. In the present specification and drawings, elements having substantially the same functional configuration are denoted by the same reference numerals, and redundant description is omitted.

図１は，本発明の実施の形態にかかる排ガス回収装置１の構成図である。図１に示すように，排ガス回収装置１は，原料投入部２，原料溶解部３及び排ガス回収部４で構成される。原料投入部２は，鉄系酸化物を加熱・還元し，鉄を含有する原料としての高温還元鉄Ｍにする回転炉床炉１０と，加熱・還元された高温還元鉄Ｍを回転炉床炉１０から原料溶解部３まで搬送するスキップ・コンベヤ１１と，このスキップ・コンベヤ１１によって搬送された高温還元鉄Ｍを原料溶解部３に投入する原料投入機構１２とで構成される。 FIG. 1 is a configuration diagram of an exhaust gas recovery apparatus 1 according to an embodiment of the present invention. As shown in FIG. 1, the exhaust gas recovery device 1 includes a raw material input unit 2, a raw material dissolution unit 3, and an exhaust gas recovery unit 4. The raw material charging unit 2 is a rotary hearth furnace that heats and reduces iron-based oxides to form high-temperature reduced iron M as a raw material containing iron, and the high-temperature reduced iron M that has been heated and reduced. A skip conveyor 11 that conveys from 10 to the raw material melting unit 3, and a raw material charging mechanism 12 that feeds the high-temperature reduced iron M conveyed by the skip conveyor 11 into the raw material melting unit 3.

回転炉床炉１０は，例えば酸化鉄，酸化ニッケル鋼等の鉄系酸化物を回転させながら熱間成形し，例えばペレット状の高温還元鉄Ｍに還元する円環形状の炉である。回転炉床炉１０は，鉄系酸化物を高温還元鉄Ｍに加熱・還元した後に排出することが可能である。 The rotary hearth furnace 10 is an annular furnace that hot-forms iron-based oxides such as iron oxide and nickel oxide steel while rotating them and reduces them to, for example, pellet-like high-temperature reduced iron M. The rotary hearth furnace 10 can discharge the iron-based oxide after heating and reducing it to high-temperature reduced iron M.

スキップ・コンベヤ１１は，回転炉床炉１０から排出された高温還元鉄Ｍを積載し，傾斜して配設されたレール上を往復走行して，原料投入機構１２まで搬送し，投入することが可能である。高温還元鉄Ｍを原料投入機構１２に投入し，空になったスキップ・コンベヤ１１は，回転炉床炉１０まで戻り，前述のように積載，搬送及び投入の動作を繰返す。図１では，図の簡略化のために１台のスキップ・コンベヤ１１のみを示したが，実際には複数のスキップ・コンベヤ１１が互いに間隔を空けて連続的に走行し，回転炉床炉１０で加熱・還元された高温還元鉄Ｍが，回転炉床炉１０よりも高い位置に配置されている原料投入機構１２まで連続的に搬送され，投入される。 The skip conveyor 11 is loaded with the high-temperature reduced iron M discharged from the rotary hearth furnace 10, travels back and forth on the inclined rail, and is transported to the raw material input mechanism 12 for input. Is possible. The high temperature reduced iron M is charged into the raw material charging mechanism 12, and the skip conveyor 11 which has been emptied returns to the rotary hearth furnace 10 and repeats the loading, transporting and loading operations as described above. In FIG. 1, only one skip conveyor 11 is shown for the sake of simplification, but actually, a plurality of skip conveyors 11 continuously run at intervals from each other, and the rotary hearth furnace 10 The high-temperature reduced iron M heated and reduced in (1) is continuously transported and charged to the raw material charging mechanism 12 disposed at a position higher than the rotary hearth furnace 10.

原料投入機構１２は，スキップ・コンベヤ１１が投入した高温還元鉄Ｍを，重力によって原料溶解部３まで搬送する搬送管１３に，開閉可能な弁１４を設けた構成にされている。搬送管１３の上端は，スキップ・コンベヤ１１が投入した高温還元鉄Ｍを受入れる末広がり形状の受入れ口１５になっている。搬送管１３の下端は，原料溶解部３に接続されている。原料投入機構１２は，弁１４を閉じることによって，投入された高温還元鉄Ｍを搬送管１３の内部に一時的に貯留可能である。また，弁１４を開くことにより，貯留されていた高温還元鉄Ｍを原料溶解部３に投入可能である。搬送管１３には，溶解炉３から気体が流入するのを防止するフラップ弁１６が設けられていてもよい。回転炉床炉１０で加熱・還元された高温還元鉄Ｍの酸化を防止し，品質を保持するために，本実施の形態では，回転炉床炉１０から原料溶解部３までの搬送時間は，約３分〜１０分程度に設定されている。搬送時間は，好ましくは，約３分程度である。 The raw material charging mechanism 12 has a configuration in which a valve 14 that can be opened and closed is provided in a transport pipe 13 that transports the high-temperature reduced iron M input by the skip conveyor 11 to the raw material melting unit 3 by gravity. The upper end of the transfer pipe 13 is a diverging shaped receiving port 15 for receiving the high-temperature reduced iron M introduced by the skip conveyor 11. The lower end of the transport pipe 13 is connected to the raw material melting part 3. The raw material charging mechanism 12 can temporarily store the charged high-temperature reduced iron M inside the transfer pipe 13 by closing the valve 14. Further, by opening the valve 14, the stored high-temperature reduced iron M can be put into the raw material melting part 3. The transport pipe 13 may be provided with a flap valve 16 for preventing gas from flowing in from the melting furnace 3. In order to prevent oxidation of the high-temperature reduced iron M heated and reduced in the rotary hearth furnace 10 and maintain the quality, in this embodiment, the transport time from the rotary hearth furnace 10 to the raw material melting part 3 is: It is set to about 3 to 10 minutes. The conveyance time is preferably about 3 minutes.

原料溶解部３は，原料投入部２の原料投入機構１２から投入された高温還元鉄Ｍを溶解する溶解炉１８と，この溶解炉１８が高温還元鉄Ｍを溶解する際の燃料としての微粉炭を吹込む供給機構３２とで構成される。なお，溶解炉１８としては，例えば転炉等が用いられてもよい。 The raw material melting unit 3 includes a melting furnace 18 that melts the high-temperature reduced iron M input from the raw material charging mechanism 12 of the raw material charging unit 2, and pulverized coal as a fuel when the melting furnace 18 melts the high-temperature reduced iron M. It is comprised with the supply mechanism 32 which blows in. For example, a converter or the like may be used as the melting furnace 18.

供給機構３２は，第１の供給系３２ａ及び第２の供給系３２ｂで構成されている。第１の供給系３２ａは，溶解炉１８の底部から微粉炭を吹込む供給ノズル３３ａと，供給ノズル３３ａに接続された供給管３４ａと，供給管３４ａに接続され，微粉炭を蓄積可能な供給タンク３５ａとで構成される。同様に，第２の供給系３２ｂは，供給ノズル３３ｂと，供給ノズル３３ｂに接続された供給管３４ｂと，供給管３４ｂに接続され，微粉炭を蓄積可能な供給タンク３５ｂとで構成される。供給管３４ａには，開閉弁３６ａが設けられており，この開閉弁３６ａを開閉することで供給タンク３５ａから供給ノズル３３ａに微粉炭を供給したり，供給を停止したりすることができる。同様に，供給管３４ｂには，開閉弁３６ｂが設けられており，この開閉弁３６ｂを開閉することで供給タンク３５ｂから供給ノズル３３ｂに微粉炭を供給したり，供給を停止したりすることができる。そして，供給機構３２は，第１の供給系３２ａと第２の供給系３２ｂによって交互に微粉炭を吹込むようになっている。 The supply mechanism 32 includes a first supply system 32a and a second supply system 32b. The first supply system 32a includes a supply nozzle 33a for blowing pulverized coal from the bottom of the melting furnace 18, a supply pipe 34a connected to the supply nozzle 33a, a supply pipe 34a connected to supply pulverized coal. It is comprised with the tank 35a. Similarly, the second supply system 32b includes a supply nozzle 33b, a supply pipe 34b connected to the supply nozzle 33b, and a supply tank 35b connected to the supply pipe 34b and capable of accumulating pulverized coal. The supply pipe 34a is provided with an open / close valve 36a. By opening / closing the open / close valve 36a, pulverized coal can be supplied from the supply tank 35a to the supply nozzle 33a, or the supply can be stopped. Similarly, the supply pipe 34b is provided with an opening / closing valve 36b. By opening / closing the opening / closing valve 36b, pulverized coal can be supplied from the supply tank 35b to the supply nozzle 33b, or the supply can be stopped. it can. The supply mechanism 32 is configured to inject pulverized coal alternately by the first supply system 32a and the second supply system 32b.

排ガス回収部４は，原料溶解部３で高温還元鉄Ｍを溶解する際に生じる排ガスを回収する第１の回収管４１と，この第１の回収管４１に連通する第２の回収管４２と，排ガスの回収先であるガスホルダー４３とで構成される。 The exhaust gas recovery unit 4 includes a first recovery pipe 41 that recovers exhaust gas generated when the high-temperature reduced iron M is dissolved in the raw material melting part 3, and a second recovery pipe 42 that communicates with the first recovery pipe 41. , And a gas holder 43 that is a collection destination of the exhaust gas.

第１の回収管４１の一端は，溶解炉１８の上部に配置されており，溶解炉１８で高温還元鉄Ｍを溶解する際に生じる例えば一酸化炭素等の排ガスを回収することが可能にされている。第１の回収管４１の他端は，固体分を下側に設けられた容器内に落下回収するように下向きに設けられている。 One end of the first recovery pipe 41 is arranged at the upper part of the melting furnace 18, and it is possible to recover exhaust gas such as carbon monoxide generated when the high temperature reduced iron M is melted in the melting furnace 18. ing. The other end of the first recovery pipe 41 is provided downward so as to drop and collect the solid content in a container provided on the lower side.

第２の回収管４２の一端は，第１の回収管４１の他端付近に連通している。第２の回収管４２の他端は，ガスホルダー４３に接続されている。第２の回収管４２には，排ガスの進行方向に沿って，排ガスの流量を調整する調整弁４５と，排ガスの流量を測定する流量計４６と，排ガスを吸引する通風機４７とが設けられている。また，第２の回収管４２は，通風機４７とガスホルダー４３との間に，排ガスを回収せずに放出する煙突４４が分岐して接続されている。なお，分岐部分には，図示しない切替え可能な仕切りが設けられており，この仕切りの設定位置を切替えることで，排ガスがガスホルダー４３又は煙突４４の一方のみに進行するように構成されている。 One end of the second recovery pipe 42 communicates with the vicinity of the other end of the first recovery pipe 41. The other end of the second recovery pipe 42 is connected to the gas holder 43. The second recovery pipe 42 is provided with an adjustment valve 45 that adjusts the flow rate of the exhaust gas, a flow meter 46 that measures the flow rate of the exhaust gas, and a ventilator 47 that sucks the exhaust gas along the traveling direction of the exhaust gas. ing. The second recovery pipe 42 is connected between the ventilator 47 and the gas holder 43 by branching a chimney 44 that discharges the exhaust gas without recovering it. A switchable partition (not shown) is provided at the branch portion, and the exhaust gas is configured to advance only to one of the gas holder 43 or the chimney 44 by switching the setting position of the partition.

調整弁４５は，開度を調整することで第２の回収管４２の内部を流れる排ガスの流量を調整することが可能である。具体的には，調整弁４５の開度を大きくすると，第２の回収管４２の内部を流れる排ガスの流量が大きくなり，調整弁４５の開度を小さくすると，第２の回収管４２の内部を流れる排ガスの流量が小さくなる。流量計４６は，例えば，断面積が連続的に変化する形状に構成されたベンチュリ計等が用いられてよい。通風機４７は，羽を回転させることにより一方の側から気体を吸引し，他方の側に気体を排出することが可能な装置である。通風機４７は，本実施の形態では，第１の回収管４１側からの排ガスを吸引し，ガスホルダー４３側に排出するように構成されている。 The adjustment valve 45 can adjust the flow rate of the exhaust gas flowing inside the second recovery pipe 42 by adjusting the opening degree. Specifically, when the opening of the adjustment valve 45 is increased, the flow rate of the exhaust gas flowing inside the second recovery pipe 42 is increased, and when the opening of the adjustment valve 45 is decreased, the inside of the second recovery pipe 42 is increased. The flow rate of the exhaust gas flowing through is reduced. As the flow meter 46, for example, a venturi meter configured in a shape whose cross-sectional area continuously changes may be used. The ventilator 47 is a device capable of sucking gas from one side and discharging gas to the other side by rotating a wing. In the present embodiment, the ventilator 47 is configured to suck the exhaust gas from the first recovery pipe 41 side and discharge it to the gas holder 43 side.

以上のような，排ガス回収装置１において，排ガス回収部４における排ガスの回収を司る制御部５０は，第２の回収管４２の調整弁４５及び流量計４６，原料投入機構１２の弁１４，並びに供給機構３２の開閉弁３６ａ，３６ｂに接続されている。制御部５０には，第２の回収管４２の流量計４６で測定された排ガスの流量測定値が，流量計４６から入力可能である。また，制御部５０には，原料投入機構１２の弁１４の開閉タイミングの情報及び供給機構３２の開閉弁３６ａ，３６ｂの開閉タイミングの情報が入力可能である。制御部５０は，それら入力信号に基づいて，調整弁４５の開度を制御可能である。即ち，制御部５０は，流量計４６からの入力信号に基づいて調整弁４５の開度を調整し，第２の回収管４２を流れる排ガスの流量をフィードバック制御することが可能である。さらに，制御部５０は，原料投入機構１２の弁１４及び供給機構３２の開閉弁３６ａ，３６ｂからの入力信号に基づいて，調整弁４５の開度を補正することが可能である。 In the exhaust gas recovery apparatus 1 as described above, the control unit 50 that manages the recovery of the exhaust gas in the exhaust gas recovery unit 4 includes the adjustment valve 45 and the flow meter 46 of the second recovery pipe 42, the valve 14 of the raw material input mechanism 12, and The on / off valves 36a and 36b of the supply mechanism 32 are connected. The flow rate measurement value of the exhaust gas measured by the flow meter 46 of the second recovery pipe 42 can be input to the control unit 50 from the flow meter 46. In addition, information on the opening / closing timing of the valve 14 of the raw material charging mechanism 12 and information on the opening / closing timing of the opening / closing valves 36 a and 36 b of the supply mechanism 32 can be input to the control unit 50. The controller 50 can control the opening degree of the regulating valve 45 based on these input signals. That is, the control unit 50 can adjust the opening of the adjustment valve 45 based on the input signal from the flow meter 46 and feedback control the flow rate of the exhaust gas flowing through the second recovery pipe 42. Further, the control unit 50 can correct the opening degree of the adjustment valve 45 based on input signals from the valve 14 of the raw material charging mechanism 12 and the on-off valves 36a and 36b of the supply mechanism 32.

以上のように構成された排ガス回収装置１において，溶解炉１８から排出された排ガスを回収する際の排ガス流量制御について説明する。原料溶解部３の溶解炉１８では，底部の供給ノズル３３ａ又は３３ｂから連続的に吹込まれる微粉炭を，図示しない酸素ノズルから供給される酸素で燃焼させ，原料投入部２から投入される高温還元鉄Ｍを溶解している。なお，微粉炭は途切れることなく連続的に吹込まれるが，高温還元鉄Ｍは，所定の時間間隔を空けて所定量ずつバッチ式に投入される。 Exhaust gas flow rate control when collecting the exhaust gas discharged from the melting furnace 18 in the exhaust gas recovery apparatus 1 configured as described above will be described. In the melting furnace 18 of the raw material melting part 3, the pulverized coal continuously blown from the supply nozzle 33a or 33b at the bottom is burned with oxygen supplied from an oxygen nozzle (not shown), and the high temperature charged from the raw material charging part 2 Reduced iron M is dissolved. Although the pulverized coal is continuously blown without interruption, the high-temperature reduced iron M is batch-wise charged at a predetermined time interval.

溶解炉１８内で高温還元鉄Ｍを溶解する際に，一酸化炭素等の排ガスが発生している。発生した排ガスは，第１の回収管４１と連通する第２の回収管４２に設けられた通風機４７の吸引動作により，溶解炉１８の上側に設けられた第１の回収管４１の一端から第１の回収管４１内に進入する。第１の回収管４１内に進入した排ガスは，第１の回収管４１の他端に向かって流れ，第１の回収管４１と連通する第２の回収管４２内に進入する。第２の回収管４２内に進入した排ガスは，通風機４７の動力で調整弁４５及び流量計４６を経てガスホルダー４３に回収される。なお，排ガスを回収しない場合は，通風機４７から排出された排ガスは，煙突４４に進行させる。 When melting the high-temperature reduced iron M in the melting furnace 18, exhaust gas such as carbon monoxide is generated. The generated exhaust gas is discharged from one end of the first recovery pipe 41 provided on the upper side of the melting furnace 18 by the suction operation of the ventilator 47 provided in the second recovery pipe 42 communicating with the first recovery pipe 41. It enters into the first recovery pipe 41. The exhaust gas that has entered the first recovery pipe 41 flows toward the other end of the first recovery pipe 41 and enters a second recovery pipe 42 that communicates with the first recovery pipe 41. The exhaust gas that has entered the second recovery pipe 42 is recovered by the power of the ventilator 47 to the gas holder 43 via the adjustment valve 45 and the flow meter 46. When exhaust gas is not collected, the exhaust gas discharged from the ventilator 47 is advanced to the chimney 44.

まず，制御部５０によって定常的に行われる第２の回収管４２を流れる排ガスの流量のフィードバック制御について説明する。上述のように第２の回収管４２を流れる排ガスの流量は，流量計４６で測定され，測定された流量測定値は制御部５０に入力される。制御部５０は，流量を一定に保持するように，入力された流量測定値に基づいて第２の回収管４２の調整弁４５の開度を調整する。即ち，入力された流量測定値が小さい場合には，排ガスの流量を大きくするように調整弁４５の開度を大きくし，入力された流量測定値が大きい場合には，排ガスの流量を小さくするように調整弁４５の開度を小さくする。このようにして，制御部５０は，第２の回収管４２を流れる排ガスの流量を定量的にフィードバック制御する。 First, feedback control of the flow rate of the exhaust gas flowing through the second recovery pipe 42 that is regularly performed by the control unit 50 will be described. As described above, the flow rate of the exhaust gas flowing through the second recovery pipe 42 is measured by the flow meter 46, and the measured flow rate value is input to the control unit 50. The controller 50 adjusts the opening of the adjustment valve 45 of the second recovery pipe 42 based on the input flow rate measurement value so as to keep the flow rate constant. That is, when the input flow rate measurement value is small, the opening of the adjustment valve 45 is increased so as to increase the exhaust gas flow rate, and when the input flow rate measurement value is large, the exhaust gas flow rate is decreased. Thus, the opening degree of the regulating valve 45 is reduced. In this way, the control unit 50 performs quantitative feedback control on the flow rate of the exhaust gas flowing through the second recovery pipe 42.

次に，図２を用いて制御部５０が原料投入機構１２の弁１４の開閉タイミングの情報に基づいて行う補正について説明する。図２は，原料投入機構１２の弁１４の開閉タイミングと制御部５０が調整弁４５の開度の補正を行うタイミングとの関係を示す図である。図２の上図では，縦軸が原料投入機構１２の弁１４の開閉状態を示している。図２の下図では，縦軸が制御部５０による調整弁４５の開度の補正値を示している。なお，図２の上図と下図のいずれにおいても，横軸は時間を示しており，両者は，同じタイミングで示されている。 Next, the correction | amendment which the control part 50 performs based on the information of the opening / closing timing of the valve 14 of the raw material injection | throwing-in mechanism 12 is demonstrated using FIG. FIG. 2 is a diagram showing the relationship between the opening / closing timing of the valve 14 of the raw material charging mechanism 12 and the timing at which the control unit 50 corrects the opening degree of the adjustment valve 45. In the upper diagram of FIG. 2, the vertical axis indicates the open / closed state of the valve 14 of the raw material charging mechanism 12. In the lower diagram of FIG. 2, the vertical axis indicates the correction value of the opening degree of the adjustment valve 45 by the control unit 50. In both the upper and lower diagrams of FIG. 2, the horizontal axis represents time, and both are shown at the same timing.

先ず，時刻Ｏでは，原料投入機構１２の弁１４は，閉じられている。スキップ・コンベヤ１１によって受入れ口１５から投入された高温還元鉄Ｍが，弁１４でせきとめられ，原料投入機構１２内に貯留される。この時に，制御部５０による第２の回収管４２の調整弁４５の開度の補正はされない。即ち，図２に示すように，制御部５０による第２の回収管４２の調整弁４５の補正値は０である。 First, at time O, the valve 14 of the raw material charging mechanism 12 is closed. The high-temperature reduced iron M input from the receiving port 15 by the skip conveyor 11 is squeezed by the valve 14 and stored in the raw material input mechanism 12. At this time, the opening degree of the regulating valve 45 of the second recovery pipe 42 is not corrected by the control unit 50. That is, as shown in FIG. 2, the correction value of the adjustment valve 45 of the second recovery pipe 42 by the control unit 50 is zero.

所定時間が経過して，時刻Ａになると，溶解炉１８に高温還元鉄Ｍを供給するために原料投入機構１２の弁１４が開き，これにより，原料投入機構１２内に貯留されていた高温還元鉄Ｍは，重力によって原料投入機構１２内から溶解炉１８に投入され始める。弁１４を開くタイミング情報は，制御部５０に入力される。なお，図２に示す制御例では，時刻Ａにおいては，制御部５０による第２の回収管４２の調整弁４５の開度の補正は直ちには行われない。 When a predetermined time elapses and time A is reached, the valve 14 of the raw material charging mechanism 12 is opened to supply the high-temperature reduced iron M to the melting furnace 18, whereby the high-temperature reduction stored in the raw material charging mechanism 12. Iron M starts to be charged into the melting furnace 18 from within the raw material charging mechanism 12 by gravity. Timing information for opening the valve 14 is input to the control unit 50. In the control example shown in FIG. 2, at time A, the control unit 50 does not immediately correct the opening of the adjustment valve 45 of the second recovery pipe 42.

時刻Ａから所定の時間Ｔ_１が経過して，図２に示す時刻Ｂになると，制御部５０によって，第２の回収管４２の流量を調整する調整弁４５の開度が補正される。この場合の補正量＋ΔＳ_１は，具体的には，第２の回収管４２の調整弁４５の開度をより大きくする値である。なお，本実施の形態では，弁１４が開いてから高温還元鉄Ｍが溶解炉１８内に入る前に第２の回収管４２の調整弁４５の開度の補正が行われるように，所定の時間Ｔ_１が設定されている。 The predetermined time T ₁ is elapsed from time A, at time B in FIG. 2, the control unit 50, the opening degree of the adjustment valve 45 for adjusting the flow rate of the second recovery tube 42 is corrected. Specifically, the correction amount + ΔS _{1 in} this case is a value that increases the opening degree of the adjustment valve 45 of the second recovery pipe 42. In the present embodiment, the opening degree of the adjustment valve 45 of the second recovery pipe 42 is corrected so as to be corrected before the high-temperature reduced iron M enters the melting furnace 18 after the valve 14 is opened. time T ₁ has been set.

時刻Ａから所定の時間Ｔ_２が経過して，図２に示す時刻Ｃになると，原料投入機構１２の弁１４が閉じられ，これにより，原料投入機構１２内から溶解炉１８内への高温還元鉄Ｍの投入は終了する。弁１４を開じるタイミング情報は，制御部５０に入力される。なお，図２に示す制御例では，時刻Ｃにおいて，制御部５０による第２の回収管４２の調整弁４５の開度の補正は終了せず，引き続き補正量＋ΔＳ_１だけ補正されている。 Elapsed from the time A predetermined time T ₂ is, at time C shown in FIG. 2, closed valve 14 of the raw material charging mechanism 12, thereby, the high temperature reduction of the raw material charging mechanism 12 inside into the melting furnace 18 The introduction of iron M ends. Timing information for opening the valve 14 is input to the control unit 50. In the control example shown in FIG. 2, at time C, the correction of the opening degree of the adjustment valve 45 of the second recovery pipe 42 by the control unit 50 is not completed, and is continuously corrected by the correction amount + ΔS ₁ .

時刻Ｂから所定の時間Ｔ_３（Ｔ_１＋Ｔ_３≧Ｔ_２）が経過して，図２に示す時刻Ｄになると，制御部５０による第２の回収管４２の調整弁４５の開度の補正が終了する。 When a predetermined time T ₃ (T ₁ + T ₃ ≧ T ₂ ) elapses from time B and time D shown in FIG. 2 is reached, the control unit 50 corrects the opening of the adjustment valve 45 of the second recovery pipe 42. Ends.

上述のように，原料投入機構１２の弁１４を開閉し，高温還元鉄Ｍを溶解炉１８に投入する図２に示すＡＣ間での動作は，図２に示すように，周期Ｔ_４毎に繰返される。また，この高温還元鉄Ｍの投入動作が行われる度に，図２に示すように，制御部５０によって第２の回収管４２の調整弁４５の開度の補正が行われる。 As described above, the operation between the ACs shown in FIG. 2 in which the valve 14 of the raw material charging mechanism 12 is opened and closed and the high-temperature reduced iron M is charged into the melting furnace 18 is performed every cycle T ₄ as shown in FIG. Repeated. Further, every time this high temperature reduced iron M is charged, the controller 50 corrects the opening degree of the adjustment valve 45 of the second recovery pipe 42 as shown in FIG.

次に，図３を用いて制御部５０が供給機構３２の供給ノズル３３ａ及び３３ｂの開閉弁３６ａ，３６ｂの開閉タイミングの情報に基づいて行う補正について説明する。図３は，溶解炉１８に微粉炭を吹込む供給機構３２の供給ノズル３３ａ及び３３ｂの開閉弁３６ａ及び３６ｂの開閉タイミングと制御部５０が調整弁４５の開度の補正を行うタイミングとの関係を示す図である。図３の上図では，縦軸が微分炭を吹込む供給機構３２の供給ノズル３３ａ及び３３ｂの開閉弁３６ａ，３６ｂの開閉状態を示している。図３の下図では，縦軸が制御部５０による調整弁４５の開度の補正値を示している。なお，図３の上図と下図のいずれにおいても，横軸は時間を示しており，両者は，同じタイミングで示されている。 Next, correction performed by the control unit 50 based on information on the opening / closing timings of the on-off valves 36a and 36b of the supply nozzles 33a and 33b of the supply mechanism 32 will be described with reference to FIG. FIG. 3 shows the relationship between the opening / closing timings of the opening / closing valves 36a and 36b of the supply nozzles 33a and 33b of the supply mechanism 32 for blowing pulverized coal into the melting furnace 18 and the timing at which the control unit 50 corrects the opening of the adjusting valve 45. FIG. In the upper diagram of FIG. 3, the vertical axis indicates the open / close state of the open / close valves 36 a and 36 b of the supply nozzles 33 a and 33 b of the supply mechanism 32 for blowing the differential charcoal. In the lower diagram of FIG. 3, the vertical axis indicates the correction value of the opening degree of the adjustment valve 45 by the control unit 50. In both the upper and lower diagrams of FIG. 3, the horizontal axis indicates time, and both are shown at the same timing.

先ず，時刻Ｏでは，供給ノズル３３ａの開閉弁３６ａが開かれており，供給ノズル３３ａから溶解炉１８内に微粉炭が連続的に吹込まれている。この時に，制御部５０による第２の回収管４２の調整弁４５の開度の補正はされない。即ち，図３に示すように，制御部５０による第２の回収管４２の調整弁４５の補正値は０である。 First, at time O, the on-off valve 36a of the supply nozzle 33a is opened, and pulverized coal is continuously blown into the melting furnace 18 from the supply nozzle 33a. At this time, the opening degree of the regulating valve 45 of the second recovery pipe 42 is not corrected by the control unit 50. That is, as shown in FIG. 3, the correction value of the adjustment valve 45 of the second recovery pipe 42 by the control unit 50 is zero.

所定時間が経過して，時刻Ｅになると，微粉炭を供給するノズルを供給ノズル３３ａから供給ノズル３３ｂに切替えるために，供給機構３２の供給ノズル３３ａの開閉弁３６ａが閉じられる。これにより，供給ノズル３３ａから溶解炉１８内への微粉炭の供給が停止される。供給ノズル３３ａの開閉弁３６ａを閉じるタイミング情報は，制御部５０に入力される。なお，図３に示す制御例では，時刻Ｅにおいては，制御部５０による第２の回収管４２の調整弁４５の開度の補正は直ちには行われない。 When a predetermined time elapses and time E is reached, the open / close valve 36a of the supply nozzle 33a of the supply mechanism 32 is closed in order to switch the nozzle for supplying pulverized coal from the supply nozzle 33a to the supply nozzle 33b. Thereby, the supply of pulverized coal from the supply nozzle 33a into the melting furnace 18 is stopped. Timing information for closing the on-off valve 36 a of the supply nozzle 33 a is input to the control unit 50. In the control example shown in FIG. 3, at time E, the control unit 50 does not immediately correct the opening of the adjustment valve 45 of the second recovery pipe 42.

時刻Ｅから所定の時間Ｔ_５経過して，図３に示す時刻Ｆになると，制御部５０によって，第２の回収管４２の流量を調整する調整弁４５の開度が補正される。この場合の補正量−ΔＳ_２は，具体的には，第２の回収管４２の調整弁４５の開度をより小さくする値である。なお，本実施の形態では，供給ノズル３３ａ又は３３ｂからの微粉炭の供給が停止した後に第２の回収管４２の調整弁４５の開度の補正が行われるように，所定の時間Ｔ_５が設定されている。 When a predetermined time T _{5 has} elapsed from time E and time F shown in FIG. 3 is reached, the opening of the adjustment valve 45 that adjusts the flow rate of the second recovery pipe 42 is corrected by the control unit 50. Specifically, the correction amount −ΔS _{2 in} this case is a value that makes the opening degree of the adjustment valve 45 of the second recovery pipe 42 smaller. In the present embodiment, as the second opening of the correction of the adjustment valve 45 of the recovery tube 42 is performed after the supply of the pulverized coal from the feed nozzle 33a or 33b has been stopped, the predetermined time T ₅ Is set.

時刻Ｅから所定の時間Ｔ_６が経過して，図３に示す時刻Ｇになると，供給機構３２の供給ノズル３３ｂの開閉弁３６ｂが開かれる。これにより，供給ノズル３３ｂから溶解炉１８内への微粉炭の噴射が開始される。供給ノズル３３ｂの開閉弁３６ｂを開くタイミング情報は，制御部５０に入力される。なお，図３に示す制御例では，時刻Ｇにおいて，制御部５０による第２の回収管４２の調整弁４５の開度の補正は終了せず，引き続き補正量−ΔＳ_２だけ補正されている。 A predetermined time from the time E T ₆ has elapsed, at time G of FIG. 3, the on-off valve 36b of the supply nozzle 33b of the feed mechanism 32 is opened. Thereby, the injection of pulverized coal from the supply nozzle 33b into the melting furnace 18 is started. Timing information for opening the on-off valve 36b of the supply nozzle 33b is input to the control unit 50. In the control example shown in FIG. 3, at time G, the opening degree of the correction of the adjustment valve 45 of the second recovery tube 42 by the control unit 50 does not end, continue to be by the correction amount -Derutaesu ₂ correction.

時刻Ｅから所定の時間Ｔ_７（Ｔ_５＋Ｔ_７≧Ｔ_６）が経過して，図３に示す時刻Ｈになると，制御部５０による第２の回収管４２の調整弁４５の開度の補正が終了する。 When a predetermined time T ₇ (T ₅ + T ₇ ≧ T ₆ ) elapses from time E and time H shown in FIG. 3 is reached, the control unit 50 corrects the opening of the adjustment valve 45 of the second recovery pipe 42. Ends.

上述のように，供給機構３２の供給ノズル３３ａ及び３３ｂの開閉弁３６ａ及び３６ｂを開閉し，溶解炉１８に微粉炭を吹込む供給ノズル３３ａ及び３３ｂを切替える図３に示すＥＧ間での動作は，図３に示すように，周期Ｔ_８毎に繰返される。また，この切替え動作が行われる度に，図３に示すように，制御部５０によって第２の回収管４２の調整弁４５の開度の補正が行われる。 As described above, the operation between the EGs shown in FIG. 3 that opens and closes the on-off valves 36a and 36b of the supply nozzles 33a and 33b of the supply mechanism 32 and switches the supply nozzles 33a and 33b for blowing pulverized coal into the melting furnace 18 is as follows. as shown in FIG. 3, it is repeated every period T _8. Further, every time this switching operation is performed, as shown in FIG. 3, the opening of the adjustment valve 45 of the second recovery pipe 42 is corrected by the control unit 50.

以上の実施の形態によれば，連続的に吹込まれる微粉炭を燃焼させ，投入された高温還元鉄Ｍを溶解する溶解炉１８で発生する排ガスを，第１の回収管４１を介して第２の回収管４２で回収する際に，第２の回収管４２を流れる排ガスの流量を流量計４６で測定し，測定された流量測定値に基づいて，制御部５０が調整弁４５の開度を調整して，回収される排ガスの流量を定常的にフィードバック制御し，さらに，溶解炉１８に高温還元鉄Ｍが投入されるタイミングで，制御部５０が第２の回収管４２の調整弁４５の開度が大きくなるように，調整弁４５の開度を補正するようにした。これにより，高温還元鉄Ｍが溶解炉１８内に投入され，排ガスの流量が急激に増大する際に，調整弁４５の開度を予め大きく設定することができるので，溶解炉１８の炉口から排ガスが噴出してしまう問題が防止される。 According to the above embodiment, the pulverized coal that is continuously blown is burned, and the exhaust gas generated in the melting furnace 18 that melts the high-temperature reduced iron M that has been introduced is passed through the first recovery pipe 41 to the first. When collecting with the second collection pipe 42, the flow rate of the exhaust gas flowing through the second collection pipe 42 is measured with the flow meter 46, and the control unit 50 opens the opening of the adjustment valve 45 based on the measured flow rate value. And the control unit 50 controls the adjustment valve 45 of the second recovery pipe 42 at the timing when the high-temperature reduced iron M is introduced into the melting furnace 18. The opening degree of the regulating valve 45 is corrected so that the opening degree becomes larger. As a result, when the high-temperature reduced iron M is introduced into the melting furnace 18 and the flow rate of the exhaust gas increases rapidly, the opening degree of the regulating valve 45 can be set large in advance. The problem of exhaust gas squirting is prevented.

また，溶解炉１８に連続的に微粉炭を供給する供給ノズル３３ａ及び３３ｂを切替え等のために一時停止させるタイミングで，制御部５０が第２の回収管４２の調整弁４５の開度が小さくなるように，調整弁４５の開度を補正するようにした。これにより，微粉炭の供給が途絶えて，回収する排ガスの流量が減少する際に，調整弁４５の開度を予め小さく設定することができるので，溶解炉１８から回収する排ガスの性状が悪化してしまう問題が防止される。 Further, at the timing when the supply nozzles 33a and 33b for continuously supplying the pulverized coal to the melting furnace 18 are temporarily stopped for switching or the like, the controller 50 reduces the opening of the adjustment valve 45 of the second recovery pipe 42. Thus, the opening degree of the adjusting valve 45 is corrected. As a result, when the supply of pulverized coal is interrupted and the flow rate of the exhaust gas to be recovered is reduced, the opening degree of the adjustment valve 45 can be set small in advance, so that the properties of the exhaust gas recovered from the melting furnace 18 are deteriorated. Problem is prevented.

さらに，制御部５０による上述のフィードバック制御及び補正によって，回収する排ガスの濃度及び量が従来よりも安定化され，溶解炉１８の稼動状況が従来よりも安定化される。排ガスの濃度及び量が安定化することにより，集塵効率が上昇する効果や，通風機の消費電力の低減等の効果もある。 Furthermore, the above-described feedback control and correction by the control unit 50 stabilizes the concentration and amount of the exhaust gas to be recovered, and stabilizes the operation status of the melting furnace 18 than before. By stabilizing the concentration and amount of exhaust gas, there are the effects of increasing dust collection efficiency and reducing the power consumption of the ventilator.

以上，添付図面を参照しながら本発明の好適な実施形態について説明したが，本発明は係る例に限定されない。当業者であれば，特許請求の範囲に記載された技術的思想の範疇内において，各種の変更例又は修正例に想到し得ることは明らかであり，それらについても当然に本発明の技術的範囲に属するものと了解される。 As mentioned above, although preferred embodiment of this invention was described referring an accompanying drawing, this invention is not limited to the example which concerns. It is obvious for those skilled in the art that various changes or modifications can be conceived within the scope of the technical idea described in the claims. It is understood that it belongs to.

上述した実施形態においては，原料投入機構１２の弁１４が開いてから高温還元鉄Ｍが溶解炉１８内に入る前に第２の回収管４２の調整弁４５の開度の補正が行われるように，所定の時間Ｔ_１が設定されているが，高温還元鉄Ｍが溶解炉１８内に入る際，又は入った後に第２の回収管４２の調整弁４５の開度の補正が行われるように，所定の時間Ｔ_１が設定されてもよい。 In the embodiment described above, the opening degree of the adjustment valve 45 of the second recovery pipe 42 is corrected before the high-temperature reduced iron M enters the melting furnace 18 after the valve 14 of the raw material charging mechanism 12 is opened. Although the predetermined time T ₁ is set, the opening degree of the adjustment valve 45 of the second recovery pipe 42 is corrected when or after the high temperature reduced iron M enters the melting furnace 18. , the predetermined time T ₁ is may be set.

また，上述した実施形態においては，供給ノズル３３ａ又は３３ｂからの微粉炭の供給が停止した後に第２の回収管４２の調整弁４５の開度の補正が行われるように，所定の時間Ｔ_５が設定されているが，供給ノズル３３ａ又は３３ｂからの微粉炭の供給が停止する際，又は停止する前に第２の回収管４２の調整弁４５の開度の補正が行われるように，所定の時間Ｔ_５が設定されてもよい。 In the above-described embodiment, the predetermined time T ₅ is set so that the opening of the adjustment valve 45 of the second recovery pipe 42 is corrected after the supply of pulverized coal from the supply nozzle 33a or 33b is stopped. Is set so that the opening of the adjustment valve 45 of the second recovery pipe 42 is corrected when the supply of pulverized coal from the supply nozzle 33a or 33b is stopped or before the supply is stopped. of it may be time T ₅ is set.

また，上述した実施形態においては，溶解炉１８に投入する高温還元鉄Ｍを熱間成形する炉が１の回転炉床炉１０である場合について説明したが，高温還元鉄Ｍを熱間成形する炉は，１以上のその他の炉であってもよい。 In the above-described embodiment, the case where the furnace for hot forming the high-temperature reduced iron M to be introduced into the melting furnace 18 is one rotary hearth furnace 10, but the high-temperature reduced iron M is hot formed. The furnace may be one or more other furnaces.

また，上述した実施形態においては，原料投入部２において，回転炉床炉１０から原料投入機構１２に高温還元鉄Ｍを搬送する際にスキップ・コンベヤ１１を用いる場合について説明したが，原料投入部２でその他の搬送機構が用いられてもよい。 In the above-described embodiment, the case where the skip conveyor 11 is used when the high-temperature reduced iron M is transported from the rotary hearth furnace 10 to the raw material charging mechanism 12 in the raw material charging unit 2 has been described. 2, other transport mechanisms may be used.

また，上述した実施形態においては，溶解炉１８に高温還元鉄Ｍを投入する原料投入部２が１つである場合について説明したが，溶解炉１８に高温還元鉄Ｍを投入する原料投入部２が２以上設けられてもよい。 In the above-described embodiment, the case where there is one raw material charging unit 2 for charging the high-temperature reduced iron M into the melting furnace 18 has been described. However, the raw material charging unit 2 for charging the high-temperature reduced iron M into the melting furnace 18. 2 or more may be provided.

また，上述した実施形態においては，溶解炉１８に高温還元鉄Ｍを投入する際の原料投入機構１２として，弁１４を用いている場合について説明したが，高温還元鉄Ｍを溶解炉１８に投入するために，その他の機構が用いられてもよい。 In the above-described embodiment, the case where the valve 14 is used as the raw material charging mechanism 12 when the high temperature reduced iron M is charged into the melting furnace 18 has been described. However, the high temperature reduced iron M is charged into the melting furnace 18. Other mechanisms may be used to do this.

また，上述した実施形態においては，溶解炉１８内に微粉炭を供給する供給ノズル３３ａ，３３ｂが２つである場合について説明したが，溶解炉１８に３つ以上の供給ノズルが設けられてもよい。 In the above-described embodiment, the case where there are two supply nozzles 33a and 33b for supplying pulverized coal into the melting furnace 18 has been described. However, the melting furnace 18 may be provided with three or more supply nozzles. Good.

また，上述した実施形態においては，連通する２つの回収管４１，４２から排ガスを回収する場合について説明したが，排ガスを回収する回収管の数は１又は３以上であってもよい。 In the above-described embodiment, the case where exhaust gas is recovered from two communicating recovery pipes 41 and 42 has been described. However, the number of recovery pipes that recover exhaust gas may be 1 or 3 or more.

また，上述した実施形態においては，原料が高温還元鉄Ｍである場合について説明したが，高温還元鉄Ｍ以外の原料に対しても本発明を適用可能である。 Moreover, although the case where a raw material was high temperature reduced iron M was demonstrated in embodiment mentioned above, this invention is applicable also to raw materials other than high temperature reduced iron M.

本発明は，例えば高温還元鉄等の原料を溶解する溶解炉で発生する排ガスを回収する排ガス回収ライン等に有用である。 The present invention is useful, for example, in an exhaust gas recovery line that recovers exhaust gas generated in a melting furnace that dissolves raw materials such as high-temperature reduced iron.

本発明の実施の形態における排ガス回収装置の構成図である。It is a lineblock diagram of the exhaust gas recovery device in an embodiment of the invention. 原料投入機構の弁の開閉タイミングと，制御部による第２の排ガス回収管の調整弁の開度の補正タイミングとの関係を示す図である。It is a figure which shows the relationship between the opening / closing timing of the valve | bulb of a raw material injection | throwing-in mechanism, and the correction | amendment timing of the opening degree of the adjustment valve of the 2nd exhaust gas recovery pipe | tube by a control part. 供給機構の２つの供給ノズルの開閉弁の開閉タイミングと，制御部５０による第２の排ガス回収管の調整弁の開度の補正タイミングとの関係を示す図である。It is a figure which shows the relationship between the opening / closing timing of the opening / closing valve of the two supply nozzles of a supply mechanism, and the correction timing of the opening degree of the adjustment valve of the 2nd exhaust gas recovery pipe | tube by the control part.

Explanation of symbols

Ｍ高温還元鉄
１排ガス回収装置
２原料投入部
３原料溶解部
４排ガス回収部
１０回転炉床炉
１１スキップ・コンベヤ
１２原料投入機構
１３搬送管
１４弁
１５受入れ口
１６フラップ弁
１８溶解炉
３２，３２ａ，３２ｂ供給機構
３３ａ，３３ｂ供給ノズル
３４ａ，３４ｂ供給管
３５ａ，３５ｂ供給タンク
３６ａ，３６ｂ開閉弁
４１第１の回収管
４２第２の回収管
４３ガスホルダー
４４煙突
４５調整弁
４６流量計
４７通風機
５０制御部 M High-temperature reduced iron 1 Exhaust gas recovery device 2 Raw material charging unit 3 Raw material melting unit 4 Exhaust gas recovery unit 10 Rotary hearth furnace 11 Skip conveyor 12 Raw material charging mechanism 13 Transport pipe 14 Valve 15 Receiving port 16 Flap valve 18 Melting furnace 32, 32a , 32b Supply mechanism 33a, 33b Supply nozzle 34a, 34b Supply pipe 35a, 35b Supply tank 36a, 36b On-off valve 41 First recovery pipe 42 Second recovery pipe 43 Gas holder 44 Chimney 45 Adjusting valve 46 Flow meter 47 Ventilator 50 Control unit

Claims

An exhaust gas recovery device that recovers exhaust gas discharged from a melting furnace that burns pulverized coal and dissolves the raw material while repeatedly charging the raw material batchwise into the melting furnace,
A flow path communicating with the melting furnace and flowing exhaust gas to the gas holder;
An adjustment valve provided in the flow path for adjusting the flow rate of the exhaust gas;
A flow meter provided in the flow path for measuring the flow rate of exhaust gas;
A controller for controlling the opening of the regulating valve based on the flow rate of the exhaust gas measured by the flow meter,
The controller corrects to increase the opening of the regulating valve based on the timing when the raw material is supplied to the melting furnace, and based on the timing when the supply of pulverized coal to the melting furnace is interrupted. The exhaust gas recovery apparatus is corrected so as to reduce the opening degree of the regulating valve.

Wherein, during a predetermined supply of the raw material into the melting furnace is determined based on the time to be the start time, and correcting the opening degree of the adjustment valve, according to claim 1 Exhaust gas recovery device.

Wherein, during a predetermined blowing pulverized coal into the melting furnace is determined based on the time to stop time, and correcting the opening degree of the regulating valve, according to claim 1 Exhaust gas recovery equipment.

The exhaust gas recovery apparatus according to any one of claims 1 to 3 , wherein the raw material is a raw material containing iron.

A control method for an exhaust gas recovery device that recovers exhaust gas discharged from a melting furnace that burns pulverized coal and dissolves the raw material while repeatedly charging the raw material batchwise into the melting furnace,
Measuring the flow rate of exhaust gas to be recovered;
Controlling the flow rate of the exhaust gas to be recovered by controlling the opening of the regulating valve based on the measured flow rate of the exhaust gas;
Correcting the control so that the flow rate of the exhaust gas to be recovered is increased based on the timing at which the raw material is supplied to the melting furnace;
And a step of correcting the control so that the flow rate of the recovered exhaust gas is reduced based on the timing at which the supply of pulverized coal to the melting furnace is interrupted. .

The step of correcting the control is performed such that the flow rate of the exhaust gas to be recovered is increased for a predetermined time determined based on a time point at which the supply of the raw material to the melting furnace is started. The method for controlling an exhaust gas recovery apparatus according to claim 5 .

The step of correcting the control is performed such that the flow rate of the exhaust gas to be recovered is reduced for a predetermined time determined based on a point in time when the injection of pulverized coal into the melting furnace is stopped. The method for controlling an exhaust gas recovery apparatus according to claim 5 .

The method for controlling an exhaust gas recovery apparatus according to any one of claims 5 to 7 , wherein the raw material is a raw material containing iron.