JP5630095B2 - Exhaust gas treatment method for sintering machine - Google Patents
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Description
本発明は、焼結機から出る排ガスを処理する方法に関し、さらに詳しくは、複数の焼結機による排ガスを効率的に処理するために、複数の焼結機による排ガスを合流させ、単一の排ガス処理設備で一括処理することができる焼結機の排ガス処理方法に関する。 The present invention relates to a method for treating exhaust gas emitted from a sintering machine, and more specifically, in order to efficiently treat exhaust gas from a plurality of sintering machines, the exhaust gases from a plurality of sintering machines are combined to form a single The present invention relates to an exhaust gas treatment method for a sintering machine that can perform batch treatment with an exhaust gas treatment facility.
製鉄工場における焼結機から出る排ガスでは、大気汚染を防止するため、ダストやＮＯx、ＳＯx、ダイオキシンといった汚染物質の濃度が規制されており、それらを除去する手段として、最近では活性炭充填方式の排ガス処理設備の導入が進んでいる。 In order to prevent air pollution, the concentration of pollutants such as dust, NO x , SO x , and dioxin is regulated in the exhaust gas from a sintering machine in an iron factory. The introduction of exhaust gas treatment equipment is progressing.
排ガス処理設備は活性炭による圧力損失が大きいことから、一般的に、排ガス処理設備の入側（排ガスが導入される側）に昇圧ファンを配置することにより、排ガスを昇圧して排ガス処理設備のガス処理量を確保する。この場合、焼結機による排ガスの風量や圧力に応じ、昇圧ファンの風量を調整して運転し、排ガス処理設備のガス処理量が減少して焼結機の生産性が低下するのを防止する。 Since the exhaust gas treatment equipment has a large pressure loss due to the activated carbon, in general, a booster fan is arranged on the inlet side of the exhaust gas treatment equipment (the side where the exhaust gas is introduced) to boost the exhaust gas and the gas of the exhaust gas treatment equipment. Secure the throughput. In this case, the operation of the booster fan is adjusted according to the volume and pressure of the exhaust gas from the sintering machine to prevent the gas throughput of the exhaust gas treatment facility from decreasing and the productivity of the sintering machine from decreasing. .
複数の焼結機を配置する場合にそれらの排ガスを処理する方法として、焼結機ごとに排ガス処理設備を配置して処理する方法と、複数の焼結機の排ガスを合流させて単一の排ガス処理設備により処理する方法が考えられる。 When arranging a plurality of sintering machines, as a method of treating those exhaust gases, a method of arranging and treating exhaust gas treatment equipment for each sintering machine, and combining a plurality of sintering machine exhaust gases into a single A method of treating with an exhaust gas treatment facility is conceivable.
焼結機ごとに排ガス処理設備を配置して処理する場合、焼結機ごとに、ダストを除去する電気集塵機、焼結機と電気集塵機から排ガスを排出する主排風機、昇圧ファン、排ガス処理設備および煙突の順にダクトを介して配置する焼結設備が多用される。この場合、主排風機の回転数や、主排風機の入側または出側に設けた風量調整ダンパーの開度などに応じて昇圧ファンの風量を調整し、焼結機の生産性が低下するのを防止して排ガスを処理していた。しかし、非常に高価な排ガス処理設備を焼結機ごとに配置することから、設備コストや設置スペースが問題となる。 When an exhaust gas treatment facility is disposed for each sintering machine, the dust collector is removed for each sintering machine, a main exhaust fan that exhausts exhaust gas from the sintering machine and the electrostatic dust collector, a booster fan, and an exhaust gas treatment facility. In addition, a sintering facility is often used which is arranged through a duct in the order of the chimney. In this case, the air volume of the booster fan is adjusted according to the rotational speed of the main exhaust fan, the opening of the air volume adjusting damper provided on the inlet side or the outlet side of the main exhaust fan, and the productivity of the sintering machine decreases. The exhaust gas was treated to prevent this. However, since very expensive exhaust gas treatment equipment is arranged for each sintering machine, equipment cost and installation space become problems.
一方、複数の焼結機による排ガスを合流させ、合流した排ガスを昇圧ファンで排ガス処理設備に送る場合、一つの焼結機の操業開始や停止といった変化により昇圧ファン入側における排ガスの圧力が変動すると、他の焼結機の主排風機による排ガスの風量および圧力に影響を与える。したがって、急激な主排風機の風量変動が発生した場合でも他の焼結機の操業に影響を与えないため、主排風機の風量変動に対して素早く追従できる焼結設備の制御方法が必要となる。 On the other hand, when exhaust gas from multiple sintering machines is merged and the combined exhaust gas is sent to the exhaust gas treatment facility with a booster fan, the pressure of the exhaust gas on the inlet side of the booster fan fluctuates due to changes such as the start or stop of operation of one sintering machine This affects the air volume and pressure of the exhaust gas from the main exhaust of other sintering machines. Therefore, even if sudden air flow fluctuations of the main exhaust fan occur, it does not affect the operation of other sintering machines, so there is a need for a sintering facility control method that can quickly follow the air flow fluctuations of the main exhaust fan. Become.
図１は、従来の焼結機の排ガス処理方法により、複数の焼結機による排ガスを処理する場合の排ガスフローを示す図である。同図は焼結機ごとに排ガス処理設備を配置して処理する場合を示し、同図に示す焼結設備１では、焼結機２と、排ガスに含まれるダストを除去する電気集塵機３と、焼結機と電気集塵機から排ガスを排出する主排風機４と、排ガスを昇圧する昇圧ファン５と、排ガスから主にＮＯx、ＳＯxおよびダイオキシンを除去する排ガス処理設備６と、排ガスを大気中に排出する煙突７と、これらを接続する煙道ダクトを用いる。 FIG. 1 is a diagram showing an exhaust gas flow when exhaust gas is processed by a plurality of sintering machines by a conventional exhaust gas processing method of a sintering machine. The figure shows a case where an exhaust gas treatment facility is disposed and processed for each sintering machine. In the sintering equipment 1 shown in the figure, a sintering machine 2, an electric dust collector 3 for removing dust contained in the exhaust gas, A main exhaust fan 4 that exhausts exhaust gas from a sintering machine and an electric dust collector, a booster fan 5 that boosts the exhaust gas, an exhaust gas treatment facility 6 that mainly removes NO x , SO x and dioxin from the exhaust gas, and exhaust gas in the atmosphere The chimney 7 to be discharged to the air and a flue duct connecting them are used.
焼結設備では、焼結機の開始や停止といった操業状態の変化に応じて主排風機の回転数やダンパー開度などを調整することから、複数の焼結機を配置する場合、焼結機によって主排風機の回転数やダンパー開度が異なる事態が生じる。従来の主排風機の回転数やダンパー開度などに応じて昇圧ファンの風量を調整する制御方法を、複数の焼結機による排ガスを合流させて単一の排ガス処理設備で一括処理する場合に適用するのは、焼結機によって異なる主排風機の回転数やダンパー開度に対して、単一の昇圧ファンで調整することから困難である。このため、図１に示すように焼結機ごとに排ガス処理設備を配置し、同図の白抜き矢印で示す方向に排ガスを送って処理しているのが現状である。 Sintering equipment adjusts the rotational speed of the main exhaust fan and the damper opening according to changes in operating conditions such as starting and stopping of the sintering machine. Depending on the situation, the rotational speed of the main exhaust fan and the damper opening may differ. The conventional control method that adjusts the air volume of the booster fan according to the rotational speed of the main exhaust fan, damper opening, etc., when exhaust gases from multiple sintering machines are combined and processed in a single exhaust gas treatment facility. It is difficult to apply a single booster fan to adjust the rotational speed and damper opening of the main exhaust fan, which differ depending on the sintering machine. For this reason, as shown in FIG. 1, an exhaust gas treatment facility is disposed for each sintering machine, and the exhaust gas is sent and processed in the direction indicated by the white arrow in the figure.
焼結機の排ガスを処理する方法に関し、従来から種々の提案がなされており、例えば特許文献１および２がある。特許文献１および２の処理方法は、焼結機ごとに排ガス処理設備を配置した場合、焼結機の操業を開始する際に昇圧ファンの吸引により強い負圧が生じ、煙道ダクト等の設備が破損するのを防止することを目的としている。 Various proposals have been made regarding methods for treating exhaust gas from a sintering machine. For example, there are Patent Documents 1 and 2. In the treatment methods of Patent Documents 1 and 2, when an exhaust gas treatment facility is arranged for each sintering machine, a strong negative pressure is generated by the suction of the booster fan when starting the operation of the sintering machine, and facilities such as a flue duct Is intended to prevent damage.
特許文献１に開示される焼結機の排ガス処理方法では、焼結機、主排風機、昇圧ファン、排ガス処理設備および煙突の順に煙道ダクトを介して配置し、主排風機と昇圧ファンの間に外気吸引口を設ける。焼結機を起動させる前に主排風機が備える風量調整ダンパーを閉じ、外気吸引口が備える風量調整ダンパーを開く。 In the exhaust gas treatment method for a sintering machine disclosed in Patent Document 1, a sintering machine, a main exhaust fan, a booster fan, an exhaust gas treatment facility, and a chimney are arranged in this order through a flue duct. An outside air suction port is provided between them. Before starting the sintering machine, close the air volume adjustment damper of the main exhaust fan, and open the air volume adjustment damper of the outside air suction port.
焼結機を起動させる際に主排風機と昇圧ファンの間の排ガスの圧力を一定にしつつ、主排風機が備える風量調整ダンパーを徐々に開き、外気吸引口が備える風量調整ダンパーを徐々に閉じることにより、昇圧ファンの吸引により強い負圧が生じ、煙道ダクト等の設備が破損するのを防止する。焼結機の起動が完了した後、主排風機が備える風量調整ダンパーを全開とし、外気吸引口が備える風量調整ダンパーを全閉とし、焼結機の排ガスを排ガス処理設備に送り処理するとしている。 While starting up the sintering machine, while keeping the pressure of the exhaust gas between the main exhaust fan and the booster fan constant, gradually open the air volume adjustment damper of the main exhaust fan and gradually close the air volume adjustment damper of the outside air suction port As a result, a strong negative pressure is generated by the suction of the booster fan, and equipment such as a flue duct is prevented from being damaged. After the start of the sintering machine is completed, the air volume adjustment damper of the main exhaust fan is fully opened, the air volume adjustment damper of the outside air suction port is fully closed, and the exhaust gas of the sintering machine is sent to the exhaust gas treatment facility. .
特許文献２に開示される焼結機の排ガス処理方法では、焼結機、電気集塵機、主排風機、昇圧ファン、排ガス処理設備および煙突の順に煙道ダクトを介して配置し、主排風機と昇圧ファンの間で分岐し、排ガス処理設備と煙突の間に合流する風量調整ダンパーを備えた煙道ダクトをバイパスとして設ける。焼結機を起動させる前に昇圧ファンが備える風量調整ダンパーを閉じ、バイパスが備える風量調整ダンパーを開く。 In the exhaust gas treatment method for a sintering machine disclosed in Patent Document 2, a sintering machine, an electrostatic precipitator, a main exhaust fan, a booster fan, an exhaust gas treatment facility, and a chimney are arranged in this order through a flue duct, A flue duct having an air volume adjusting damper that branches between the booster fans and joins between the exhaust gas treatment facility and the chimney is provided as a bypass. Before starting the sintering machine, the air volume adjustment damper provided in the booster fan is closed and the air volume adjustment damper provided in the bypass is opened.
焼結機を起動させる際、主排風機と昇圧ファンの間の排ガスの圧力を一定にしつつ、昇圧ファンが備える風量調整ダンパーを徐々に開き、バイパスが備える風量調整ダンパーを徐々に閉じることにより、昇圧ファンの吸引により強い負圧が生じ、煙道ダクト等の設備が破損するのを防止する。焼結機の起動が完了した後、昇圧ファンが備える風量調整ダンパーを全開とし、バイパスが備える風量調整ダンパーを全閉とし、焼結機の排ガスを排ガス処理設備に送り処理するとしている。 When starting the sintering machine, while keeping the pressure of the exhaust gas between the main exhaust fan and the booster fan constant, gradually opening the air volume adjustment damper provided in the boost fan and gradually closing the air volume adjustment damper provided in the bypass, Prevents damage to equipment such as flue ducts due to strong negative pressure generated by the suction of the booster fan. After the start of the sintering machine is completed, the air volume adjustment damper provided in the booster fan is fully opened, the air volume adjustment damper provided in the bypass is fully closed, and the exhaust gas of the sintering machine is sent to the exhaust gas treatment facility.
特許文献１および２には、焼結機の起動時に昇圧ファンにより煙道ダクト内が強い負圧となることによる影響をなくすため、昇圧ファンの入側圧力を一定に制御する技術が開示されているが、複数の焼結機を用いる場合に個々の焼結機の操業状態の変化による影響を抑制するための制御に関する技術は示されていない。 Patent Documents 1 and 2 disclose a technique for controlling the inlet pressure of the booster fan to be constant in order to eliminate the influence of a strong negative pressure in the flue duct caused by the booster fan when the sintering machine is started. However, when using a plurality of sintering machines, there is no technique related to control for suppressing the influence due to the change in the operating state of each sintering machine.
前述の通り、従来の焼結機ごとに昇圧ファンおよび排ガス処理設備を配置し、複数の焼結機による排ガスを処理する方法では、設備コストや設置スペースが問題となる。 As described above, in the method in which a booster fan and an exhaust gas treatment facility are arranged for each conventional sintering machine and the exhaust gas is treated by a plurality of sintering machines, the equipment cost and installation space become problems.
一方、複数の焼結機による排ガスを合流させて単一の排ガス処理設備により処理する方法は、他の焼結機に影響されて排ガス風量が変動するのを抑制でき、個々の焼結機による排ガスの風量変動に素早く追従することができる焼結設備の制御技術が確立されていないことから、ほとんど用いられていない。また、従来の主排風機の回転数やダンパー開度などに応じて昇圧ファンの風量を調整する制御方法を、複数の焼結機による排ガスを単一の排ガス処理設備で一括処理する場合に適用するのは困難である。 On the other hand, the method of combining exhaust gases from a plurality of sintering machines and treating them with a single exhaust gas treatment facility can suppress fluctuations in the exhaust gas flow rate due to the influence of other sintering machines. Since the control technology of the sintering equipment that can quickly follow the air volume fluctuation of the exhaust gas has not been established, it is hardly used. In addition, the conventional control method that adjusts the air volume of the booster fan according to the rotational speed of the main exhaust fan, damper opening, etc. is applied to the case where exhaust gas from multiple sintering machines is processed at once with a single exhaust gas treatment facility. It is difficult to do.
本発明は、このような状況に鑑みてなされたものであり、複数の焼結機による排ガスを合流させ、単一の排ガス処理設備で効率的に一括処理することができるとともに、他の焼結機に影響されて排ガス風量が変動するのを抑制でき、個々の焼結機による排ガスの風量変動に素早く追従することができる焼結機の排ガス処理方法を提供することを目的としている。 The present invention has been made in view of such a situation, and exhaust gases from a plurality of sintering machines can be merged, and can be efficiently collectively processed with a single exhaust gas treatment facility. It is an object of the present invention to provide an exhaust gas treatment method for a sintering machine that can suppress fluctuations in the exhaust gas flow rate affected by the machine and can quickly follow fluctuations in the exhaust gas flow rate by individual sintering machines.
本発明者らは、上記問題を解決するため、種々の試験を行い、鋭意検討を重ねた結果、排ガス処理設備を用いた焼結設備により焼結機の排ガスを処理する方法において、複数配置された焼結機の排ガスを合流させ、単一の昇圧ファンと排ガス処理設備で一括処理する際に、昇圧ファンの入側における排ガスの圧力に応じて昇圧ファンの風量を調整し、昇圧ファンの入側における排ガスの圧力を一定に制御することにより、他の焼結機に影響されて排ガス風量が変動するのを抑制でき、個々の焼結機による排ガスの風量変動に素早く追従することができることを知見した。 In order to solve the above problems, the present inventors have conducted various tests, and as a result of intensive studies, a plurality of them are arranged in a method for treating exhaust gas from a sintering machine with a sintering equipment using an exhaust gas treatment equipment. When the exhaust gas from the sintered machine is merged and processed at the same time with a single booster fan and exhaust gas treatment facility, the air volume of the booster fan is adjusted according to the pressure of the exhaust gas on the inlet side of the booster fan, By controlling the pressure of the exhaust gas at the constant side, it is possible to suppress fluctuations in the exhaust gas flow rate affected by other sintering machines, and to quickly follow the fluctuations in the exhaust gas flow rate by individual sintering machines. I found out.
本発明は、上記の知見に基づいて完成されたものであり、下記（１）および（２）の焼結機の排ガス処理方法を要旨としている。 The present invention has been completed on the basis of the above findings, and the gist thereof is the following exhaust gas treatment method for a sintering machine (1) and (2).
（１）複数配置された焼結機、前記焼結機ごとに設けられた電気集塵機と主排風機、昇圧ファン、排ガスからＮＯ X 、ＳＯ X およびダイオキシンを除去する活性炭充填方式の排ガス処理設備および煙突の順に煙道ダクトを介して配置された焼結設備により焼結機の排ガスを処理する方法であって、
複数配置された焼結機の排ガスを前記主排風機の出側で合流させ、単一の前記昇圧ファンと前記排ガス処理設備で一括処理するに際し、前記昇圧ファンの入側における排ガスの圧力に応じて前記昇圧ファンの風量を調整し、前記昇圧ファンの入側における排ガスの圧力を一定に制御することを特徴とする焼結機の排ガス処理方法。
(1) A plurality of sintered machines, an electrostatic precipitator and a main exhaust fan provided for each of the sintered machines, a booster fan, an activated carbon filling type exhaust gas treatment facility for removing NO x , SO x and dioxin from exhaust gas, and A method for treating exhaust gas from a sintering machine with a sintering facility arranged through a flue duct in the order of the chimney,
The sintering machine of the exhaust gas which is more disposed to merge at the outlet side of the main exhauster, upon collectively processed by the exhaust gas treatment system with single said booster fan, depending on the pressure of the exhaust gas in the inlet side of the booster fan And adjusting the air volume of the booster fan to control the exhaust gas pressure on the inlet side of the booster fan to be constant.
（２）前記昇圧ファンとして可変動翼軸流ファンを用い、前記昇圧ファンの風量を調整する際に可変動翼の角度を変更して風量を調整することを特徴とする上記（１）に記載の焼結機の排ガス処理方法。 (2) the use of a variable blade axial flow fan as a boost fan, according to the above (1), characterized in that by changing the angle of the variable wing when adjusting the air volume of the booster fan to adjust the air volume Exhaust gas treatment method for sintering machine.
本発明の焼結機の排ガス処理方法は、昇圧ファンの入側における排ガスの圧力に応じて昇圧ファンの風量を調整し、昇圧ファンの入側における排ガスの圧力を一定に制御することにより、単一の排ガス処理設備で一括処理することができるとともに、他の焼結機に影響されて排ガス風量が変動するのを抑制でき、個々の焼結機による排ガスの風量または圧力の変動に追従することができる。したがって、排ガス処理設備の配置台数を減少させることができ、焼結設備の設備コストおよび設置スペースを低減することができる。 The exhaust gas treatment method for a sintering machine according to the present invention simply adjusts the air volume of the booster fan according to the pressure of the exhaust gas on the inlet side of the booster fan, and controls the exhaust gas pressure on the inlet side of the booster fan to be constant. A single exhaust gas treatment facility can be used for batch processing, and it is possible to suppress fluctuations in the exhaust gas air volume affected by other sintering machines, and to follow fluctuations in the air volume or pressure of the exhaust gas produced by individual sintering machines. Can do. Accordingly, the number of exhaust gas treatment facilities arranged can be reduced, and the equipment cost and installation space of the sintering equipment can be reduced.
以下に、本発明の焼結機の排ガス処理方法を図面に基づいて説明する。 Below, the exhaust gas processing method of the sintering machine of this invention is demonstrated based on drawing.
図２は、本発明の焼結機の排ガス処理方法により排ガスを処理する場合の排ガスフローの一例を説明する図である。同図に示す焼結設備１では、焼結機２、電気集塵機３、主排風機４、昇圧ファン５、排ガス処理設備６および煙突７の順に煙道ダクトを介して配置される。同図に示す焼結設備では、焼結機２が複数配置され、各焼結機による排ガスは焼結機ごとに設けられた電気集塵機と主排風機を経て合流し、単一の昇圧ファン５と排ガス処理設備６で一括処理する（同図の白抜き矢印参照）。また、同図に示す焼結設備は、主排風機の風量を計測する風量計８と、合流した排ガスの圧力を計測する圧力計９を備える。 FIG. 2 is a diagram illustrating an example of an exhaust gas flow when exhaust gas is processed by the exhaust gas processing method of the sintering machine of the present invention. In the sintering equipment 1 shown in the figure, a sintering machine 2, an electrostatic precipitator 3, a main exhaust fan 4, a booster fan 5, an exhaust gas treatment equipment 6, and a chimney 7 are arranged in this order via a flue duct. In the sintering equipment shown in the figure, a plurality of sintering machines 2 are arranged, and the exhaust gas from each sintering machine joins through an electric dust collector and a main exhaust fan provided for each sintering machine, and a single booster fan 5 And the exhaust gas treatment facility 6 (see the white arrow in the figure). Moreover, the sintering equipment shown in the figure includes an air flow meter 8 for measuring the air flow of the main exhaust fan and a pressure gauge 9 for measuring the pressure of the combined exhaust gas.
本発明の焼結機の排ガス処理方法は、焼結機２、電気集塵機３、主排風機４、昇圧ファン５、排ガス処理設備６および煙突７の順に煙道ダクトを介して配置された焼結設備により焼結機の排ガスを処理する方法であって、複数配置された焼結機の排ガスを合流させ、単一の昇圧ファンと排ガス処理設備で一括処理するに際し、昇圧ファンの入側における排ガスの圧力に応じて昇圧ファンの風量を調整し、昇圧ファンの入側における排ガスの圧力を一定に制御することを特徴とする。 The exhaust gas treatment method for a sintering machine according to the present invention is a sintering process in which a sintering machine 2, an electrostatic precipitator 3, a main exhaust fan 4, a booster fan 5, an exhaust gas treatment facility 6 and a chimney 7 are arranged in this order via a flue duct. Exhaust gas on the inlet side of a booster fan when the exhaust gas from a plurality of sintered machines is merged and processed together with a single booster fan and exhaust gas treatment facility. The flow rate of the booster fan is adjusted according to the pressure of the booster fan, and the exhaust gas pressure on the inlet side of the booster fan is controlled to be constant.
合流した排ガスを単一の昇圧ファンと排ガス処理設備で一括処理するに際し、昇圧ファンの入側における排ガスの圧力に応じて昇圧ファンの風量を調整し、昇圧ファンの入側における排ガスの圧力を一定に制御することにより、一つの焼結機の操業状態の変化による排ガスの風量または圧力の変動に影響され、他の焼結機による排ガスの風量および圧力が変動するのを抑制できることから、個々の操業状態の変動に素早く追従して安定した排ガス処理が可能となる。 When the combined exhaust gas is processed at once with a single booster fan and exhaust gas treatment facility, the air flow of the booster fan is adjusted according to the exhaust gas pressure on the inlet side of the booster fan, and the exhaust gas pressure on the inlet side of the booster fan is kept constant. Because it can be influenced by fluctuations in the air volume or pressure of exhaust gas due to changes in the operating state of one sintering machine, and it can be suppressed that the air volume and pressure of exhaust gas from other sintering machines fluctuate. Stable exhaust gas treatment becomes possible by quickly following the fluctuations in operating conditions.
昇圧ファンの入側における排ガスの圧力を一定に制御する際に、昇圧ファンの風量を調整する方法は、従来から用いられている種々の方法を用いることができ、例えば、昇圧ファンの入側または出側に風量調整ダンパーを配置して開度を調整したり、昇圧ファンの回転数を増減させたりすることにより行う。本発明の焼結機の排ガス処理方法は、昇圧ファンとして可変動翼軸流ファンを用い、可変動翼の角度を変更することにより昇圧ファンの風量を調整するのが望ましい。可変動翼軸流ファンは遠心ファンと比較して、大風量で変動が大きい場合に有効であり、複数の焼結機を１機の昇圧ファンで制御する場合風量の変動が大きいため可変動翼軸流ファンの方が安定に操業可能となるからである。また、可変動翼軸流ファンは、ファン本体が小さく設置スペースが少なくてすむという利点もある。 When the pressure of the exhaust gas at the inlet side of the booster fan is controlled to be constant, various methods conventionally used can be used to adjust the air volume of the booster fan. This is done by arranging an air volume adjusting damper on the outlet side to adjust the opening, or increasing or decreasing the rotation speed of the booster fan. In the exhaust gas treatment method for a sintering machine according to the present invention, it is desirable to use a variable blade axial fan as a booster fan and adjust the air volume of the booster fan by changing the angle of the variable blade. The variable rotor blade axial flow fan is effective when the fluctuation is large and the air flow is large compared to the centrifugal fan, and when the plurality of sintering machines are controlled by a single booster fan, the air flow fluctuation is large. This is because the axial fan can be operated stably. Further, the variable rotor blade axial fan has an advantage that the fan body is small and installation space is small.
昇圧ファンの入側における排ガスの圧力は、僅かに負圧とするのが望ましい。これにより、個々の焼結機による排ガス風量が変動した場合に主排風機の負荷を軽減しつつ、迅速に昇圧ファンの入側における排ガスの圧力を一定に制御できるからである。具体的には、昇圧ファンの入側における排ガスの圧力を−０．０３ｋＰａ〜−０．１０ｋＰａの負圧に制御するのが望ましい。 It is desirable that the pressure of the exhaust gas on the inlet side of the booster fan is slightly negative. This is because when the exhaust gas flow rate of each sintering machine fluctuates, the pressure of the exhaust gas at the inlet side of the booster fan can be quickly controlled while reducing the load on the main exhaust fan. Specifically, it is desirable to control the exhaust gas pressure on the inlet side of the booster fan to a negative pressure of -0.03 kPa to -0.10 kPa.
本発明の焼結機の排ガス処理方法は、排ガス処理設備として活性炭充填方式のものを用いる。活性炭充填方式は、大気汚染の原因となるＮＯX、ＳＯXおよびダイオキシンを排ガスから効率よく除去することができるからである。
Exhaust gas treatment process of the sintering machine of the present invention, Ru used as the activated carbon filling system as an exhaust gas treatment equipment. This is because the activated carbon filling method can efficiently remove NO x , SO x and dioxins that cause air pollution from the exhaust gas.
前記図２に示す焼結設備は、本発明の焼結機の排ガス処理方法を前提として、複数の焼結機による排ガスを合流させて単一の昇圧ファンと排ガス処理設備で一括処理する例であるが、例えば、前記図１に示すような従来型の焼結設備において、複数の焼結機による排ガスを主排風機の出側で合流させ、合流した排ガスを複数の昇圧ファンおよび排ガス処理設備に送るように煙道ダクトを分岐させて配管する。 The sintering equipment shown in FIG. 2 is an example in which exhaust gases from a plurality of sintering machines are combined and processed together with a single booster fan and exhaust gas treatment equipment on the premise of the exhaust gas treatment method for a sintering machine of the present invention. For example, in the conventional sintering facility as shown in FIG. 1, exhaust gases from a plurality of sintering machines are merged at the outlet side of the main exhaust fan, and the combined exhaust gases are combined with a plurality of booster fans and exhaust gas treatment facilities. Branch the flue duct so that it is sent to the pipe.
さらに、それぞれの昇圧ファンの手前に風量調整ダンパー等を設けて単一の昇圧ファンと排ガス処理設備で一括処理できるように焼結設備を構成した上で、本発明の焼結機の排ガス処理方法を適用することにより、単一の昇圧ファンと排ガス処理装置を用いて安定した操業ができるとともに、他の排ガス処理装置で停機や補修を行うことができる。 Furthermore, after the sintering equipment is configured so that an air flow adjusting damper or the like is provided in front of each booster fan and can be collectively processed by a single booster fan and exhaust gas treatment equipment, the exhaust gas treatment method for a sintering machine of the present invention By applying, stable operation can be performed using a single booster fan and exhaust gas treatment device, and stopping and repair can be performed with other exhaust gas treatment devices.
本発明の焼結機の排ガス処理方法により、複数の焼結機による排ガスを処理する試験を行い、本発明の効果を検証した。 By the exhaust gas treatment method for a sintering machine of the present invention, a test for treating exhaust gas by a plurality of sintering machines was conducted to verify the effect of the present invention.
［試験方法］
図３は、実施例で行った焼結機の排ガス処理方法における排ガスフローを示す図である。図３に示す焼結設備１により、２機の焼結機２ごとに電気集塵機３、主排風機４を配置し、主排風機の出側で排ガスを合流させて単一の昇圧ファン５および排ガス処理設備６で処理した。２機の焼結機をそれぞれ第１焼結機、第２焼結機と称する。
[Test method]
FIG. 3 is a diagram illustrating an exhaust gas flow in the exhaust gas treatment method for a sintering machine performed in the example. With the sintering equipment 1 shown in FIG. 3, an electrostatic precipitator 3 and a main exhaust fan 4 are arranged for each of the two sintering machines 2, and the exhaust gas is merged on the outlet side of the main exhaust fan so that a single booster fan 5 and Treated with the exhaust gas treatment facility 6. The two sintering machines are referred to as a first sintering machine and a second sintering machine, respectively.
本発明例１では、昇圧ファン５として遠心ファンを用い、昇圧ファンの入側に配置した圧力計９の計測値に応じ、昇圧ファンの回転数を変更して風量を調整し、昇圧ファンの入側における排ガスの圧力を−０．０３ｋＰａの負圧に制御した。また、本発明例２では、昇圧ファン５として可変動翼軸流ファンを用い、昇圧ファンの入側に配置した圧力計９の計測値に応じ、昇圧ファンの可変動翼の角度を変更して風量を調整し、昇圧ファンの入側における排ガスの圧力を−０．０３ｋＰａの負圧に制御した。比較例では、昇圧ファン５として軸流ファンを用い、一定の回転数８９０ｒｐｍで昇圧ファンを稼働させた。 In Example 1 of the present invention, a centrifugal fan is used as the booster fan 5, and the air volume is adjusted by changing the rotation speed of the booster fan according to the measured value of the pressure gauge 9 arranged on the inlet side of the booster fan. The pressure of the exhaust gas on the side was controlled to a negative pressure of -0.03 kPa. Further, in Example 2 of the present invention, a variable rotor blade axial fan is used as the booster fan 5, and the angle of the variable rotor blade of the booster fan is changed according to the measured value of the pressure gauge 9 arranged on the inlet side of the booster fan. The air volume was adjusted, and the exhaust gas pressure on the inlet side of the booster fan was controlled to a negative pressure of -0.03 kPa. In the comparative example, an axial flow fan was used as the booster fan 5, and the booster fan was operated at a constant rotational speed of 890 rpm.
本実施例（本発明例および比較例）では、排ガス処理設備は活性炭充填方式のものを用いた。また、本実施例では、第１焼結機および第２焼結機が通常操業している状態から、第１焼結機の風量を減少させて停止させた。通常操業した時および第１焼結機が停止した時の第１焼結機の風量、第２焼結機の風量および全風量を表１に示す。 In this example (invention example and comparative example), the exhaust gas treatment equipment used was an activated carbon filling system. Moreover, in the present Example, the air volume of the 1st sintering machine was decreased and stopped from the state which the 1st sintering machine and the 2nd sintering machine are operating normally. Table 1 shows the air volume of the first sintering machine, the air volume of the second sintering machine and the total air volume when operating normally and when the first sintering machine is stopped.
［試験結果］
焼結機ごとに主排風機を配置した本発明例１では、第１焼結機の風量を減少させて停止するのに応じ、昇圧ファンの回転数を８９０ｒｐｍから５６０ｒｐｍｒｐｍまで変動させ、昇圧ファンの入側における排ガスの圧力を−０．０３ｋＰａに制御した。この際、第２焼結機の風量が影響を受けて６２００Ｎｍ3／ｍｉｎから６３００Ｎｍ3／ｍｉｎに変動したが、第２焼結機の生産性に影響を与えることなく安定して焼結設備を操業できた。
[Test results]
In the present invention example 1 in which a main exhaust fan is arranged for each sintering machine, the rotation speed of the booster fan is varied from 890 rpm to 560 rpm rpm in response to the reduction of the air volume of the first sintering machine and the stoppage of the booster fan. The pressure of the exhaust gas on the inlet side was controlled to -0.03 kPa. At this time, the air volume of the second sintering machine was affected and changed from 6200 Nm 3 / min to 6300 Nm 3 / min, but the sintering equipment was stably operated without affecting the productivity of the second sintering machine. I was able to operate.
可変動翼軸流ファンを用いた本発明例２では、第１焼結機の風量を減少させて停止するのに応じ、昇圧ファンの可変動翼の角度を５２°から３９°まで変動させ、昇圧ファンの入側における排ガスの圧力を−０．０３ｋＰａに制御した。この際、可変動翼角度の速やかな調整により第２焼結機の風量は６２００Ｎｍ3／ｍｉｎからほとんど変化する事無く、安定して焼結設備を操業できた。 In Example 2 of the present invention using the variable blade axial fan, the angle of the variable blade of the booster fan is changed from 52 ° to 39 ° in accordance with the reduction of the air volume of the first sintering machine and the stop. The pressure of the exhaust gas at the inlet side of the booster fan was controlled to -0.03 kPa. At this time, the air volume of the second sintering machine hardly changed from 6200 Nm 3 / min by quickly adjusting the variable blade angle, and the sintering equipment could be operated stably.
比較例では、昇圧ファンの入側における排ガスの圧力を一定に制御することなく第１焼結機を停止させ、昇圧ファンの入側における排ガスの負圧が−０．０３ｋＰａから−０．０６ｋＰａとなり、第２焼結機の風量が６２００Ｎｍ3／ｍｉｎから６７００Ｎｍ3／ｍｉｎに増加した。その結果、第２焼結機の操業が変動し生産性が低下する事態となった。 In the comparative example, the first sintering machine is stopped without controlling the pressure of the exhaust gas on the inlet side of the booster fan to be constant, and the negative pressure of the exhaust gas on the inlet side of the booster fan is changed from -0.03 kPa to -0.06 kPa. The air volume of the second sintering machine increased from 6200 Nm 3 / min to 6700 Nm 3 / min. As a result, the operation of the second sintering machine fluctuated and productivity was lowered.
これらから、複数の焼結機による排ガスを合流させ、単一の昇圧ファンと排ガス処理設備で一括処理する際に、本発明の焼結機の排ガス処理方法で昇圧ファンの入側における排ガスの圧力を一定に制御することにより、単一の排ガス処理設備で一括処理することができるとともに、他の焼結機に影響されて排ガス風量が変動するのを抑制でき、個々の焼結機による排ガスの風量または圧力の変動に追従できることが明らかになった。 From these, when exhaust gases from a plurality of sintering machines are merged and processed together with a single booster fan and exhaust gas treatment equipment, the exhaust gas pressure on the inlet side of the booster fan in the exhaust gas treatment method of the sintering machine of the present invention Can be controlled in a batch with a single exhaust gas treatment facility, and fluctuations in the exhaust gas flow rate can be suppressed by being influenced by other sintering machines. It became clear that it was possible to follow fluctuations in air volume or pressure.
本発明の焼結機の排ガス処理方法は、昇圧ファンの入側における排ガスの圧力に応じて昇圧ファンの風量を調整し、昇圧ファンの入側における排ガスの圧力を一定に制御することにより、単一の排ガス処理設備で一括処理することができるとともに、他の焼結機に影響されて排ガス風量が変動するのを抑制でき、個々の焼結機による排ガスの風量または圧力の変動に追従することができる。したがって、排ガス処理設備の配置台数を減少させることができ、焼結設備の設備コストおよび設置スペースを低減することができる。 The exhaust gas treatment method for a sintering machine according to the present invention simply adjusts the air volume of the booster fan according to the pressure of the exhaust gas on the inlet side of the booster fan, and controls the exhaust gas pressure on the inlet side of the booster fan to be constant. A single exhaust gas treatment facility can be used for batch processing, and it is possible to suppress fluctuations in the exhaust gas air volume affected by other sintering machines, and to follow fluctuations in the air volume or pressure of the exhaust gas produced by individual sintering machines. Can do. Accordingly, the number of exhaust gas treatment facilities arranged can be reduced, and the equipment cost and installation space of the sintering equipment can be reduced.
本発明の焼結機の排ガス処理方法を、高炉等に投入する原料である焼結鉱の製造に適用すれば、焼結鉱の製造歩留りを向上させることができ、本発明は製銑原料製造分野に大きく貢献することができる。 If the exhaust gas treatment method for a sintering machine of the present invention is applied to the production of sintered ore which is a raw material to be charged into a blast furnace or the like, the production yield of the sintered ore can be improved. It can contribute greatly to the field.
１：焼結設備、 ２：焼結機、 ３：電気集塵機、 ４：主排風機、
５：昇圧ファン、 ６：排ガス処理設備、 ７：煙突、 ８：風量計、 ９：圧力計
1: sintering equipment, 2: sintering machine, 3: electrostatic precipitator, 4: main exhaust fan,
5: Booster fan, 6: Exhaust gas treatment facility, 7: Chimney, 8: Air flow meter, 9: Pressure gauge
Claims (2)
複数配置された焼結機の排ガスを前記主排風機の出側で合流させ、単一の前記昇圧ファンと前記排ガス処理設備で一括処理するに際し、前記昇圧ファンの入側における排ガスの圧力に応じて前記昇圧ファンの風量を調整し、前記昇圧ファンの入側における排ガスの圧力を一定に制御することを特徴とする焼結機の排ガス処理方法。 A plurality of sintering machines, an electrostatic precipitator and a main exhaust fan provided for each sintering machine , a booster fan, an activated carbon filling type exhaust gas treatment facility for removing NO X , SO X and dioxin from exhaust gas, and a chimney A method of treating exhaust gas from a sintering machine with a sintering facility arranged via a flue duct,
The sintering machine of the exhaust gas which is more disposed to merge at the outlet side of the main exhauster, upon collectively processed by the exhaust gas treatment system and a single said booster fan, depending on the pressure of the exhaust gas in the inlet side of the booster fan And adjusting the air volume of the booster fan to control the exhaust gas pressure on the inlet side of the booster fan to be constant.
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| CN104174287B (en) * | 2014-08-06 | 2016-09-07 | 北京京诚泽宇能源环保工程技术有限公司 | A kind of sintering machine partial fume denitrating system and method |
| JP6125055B1 (en) * | 2016-01-15 | 2017-05-10 | 中外炉工業株式会社 | Combustion treatment equipment |
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| JPS52103305A (en) * | 1976-02-27 | 1977-08-30 | Kawasaki Steel Co | Central controlling system for dust collectors of construction having plurality of dusttcontaining gas flow sources such as electric furnace |
| DE2657067C3 (en) * | 1976-12-14 | 1980-05-14 | Mannesmann Ag, 4000 Duesseldorf | System for the extraction of polluted air from large buildings |
| JPS6115081A (en) * | 1984-06-29 | 1986-01-23 | 日新製鋼株式会社 | Method of controlling flow rate of exhaust gas in concentrated dust collection having plurality of electric furnace |
| JP3840363B2 (en) * | 2000-05-10 | 2006-11-01 | 新日本製鐵株式会社 | Sintered exhaust gas treatment apparatus and operation method thereof |
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