JP5211943B2 - Heating furnace exhaust equipment - Google Patents

Heating furnace exhaust equipment Download PDF

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JP5211943B2
JP5211943B2 JP2008223724A JP2008223724A JP5211943B2 JP 5211943 B2 JP5211943 B2 JP 5211943B2 JP 2008223724 A JP2008223724 A JP 2008223724A JP 2008223724 A JP2008223724 A JP 2008223724A JP 5211943 B2 JP5211943 B2 JP 5211943B2
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combustion
exhaust
burner
heating furnace
furnace
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JP2010060157A (en
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英孝 上尾
悟 益子
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Nippon Steel Corp
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Nippon Steel and Sumitomo Metal Corp
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00—Combustion technologies with mitigation potential
    • Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/25—Process efficiency
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P80/00—Climate change mitigation technologies for sector-wide applications
    • Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
    • Y02P80/15—On-site combined power, heat or cool generation or distribution, e.g. combined heat and power [CHP] supply

Description

本発明は、連続燃焼バーナと蓄熱式バーナとを備えた加熱炉の排気設備に関する。   The present invention relates to an exhaust facility for a heating furnace including a continuous combustion burner and a regenerative burner.

近年、熱間圧延設備の連続式加熱炉では、省エネルギー対策として蓄熱式（リジェネ）バーナの導入が積極的に進められている（例えば、特許文献１を参照。) 。蓄熱式バーナは、蓄熱体を備えた一対のバーナによって構成されるものであり、これら一対のバーナが燃焼と排気とを交互に繰り返しながら、一方のバーナの燃焼により発生した燃焼排ガスを他方のバーナの蓄熱体に通過させることによって、その燃焼排ガス中の排熱を蓄熱体に蓄熱し、他方のバーナが燃焼する際に、この蓄熱体に燃焼空気を通過させることによって燃焼空気を予熱し、この燃焼空気の温度を上げて省エネルギー化を図るものである。この蓄熱式バーナでは、排気時に燃焼排ガスの排熱を蓄熱体によって蓄熱回収し燃焼時に燃焼空気が蓄熱体と直接熱交換により加熱されるため、一般的なレキュペレータを用いて排熱回収する場合よりも、高い熱交換率を得ることが可能である。
特開２０００−３４５２３７号公報 In recent years, in a continuous heating furnace of a hot rolling facility, introduction of a regenerative burner has been actively promoted as an energy saving measure (see, for example, Patent Document 1). The heat storage burner is composed of a pair of burners provided with a heat storage body. While the pair of burners alternately repeat combustion and exhaust, the combustion exhaust gas generated by the combustion of one burner is used as the other burner. The exhaust heat in the combustion exhaust gas is stored in the heat storage body, and when the other burner burns, the combustion air is preheated by passing the combustion air through the heat storage body. It is intended to save energy by raising the temperature of the combustion air. In this regenerative burner, the exhaust heat of the combustion exhaust gas is stored and recovered by the heat storage body at the time of exhaust, and the combustion air is heated by direct heat exchange with the heat storage body at the time of combustion. However, it is possible to obtain a high heat exchange rate.
JP 2000-345237 A

ところで、上記特許文献１に記載される蓄熱式バーナを備えた加熱炉の排気設備では、加熱炉内の燃焼排ガスを蓄熱式バーナを介して排出する第１の排気系と、加熱炉内の燃焼排ガスを加熱炉の炉尻側から排出する第２の排気系とのうち、第１の排気系に加熱炉内の燃焼排ガスを誘引する誘引ファンを設け、第２の排気系に加熱炉の炉圧を制御する炉圧ダンバを設けて、第１の排気系と第２の排気系とを１本の煙突に接続し、この煙突から燃焼排ガスを合流して排出することが行われている。   By the way, in the exhaust equipment of the heating furnace provided with the thermal storage type burner described in the said patent document 1, the 1st exhaust system which discharges | emits the combustion exhaust gas in a heating furnace via a thermal storage type burner, and the combustion in a heating furnace Of the second exhaust system that discharges exhaust gas from the furnace bottom side of the heating furnace, an induction fan that induces combustion exhaust gas in the heating furnace is provided in the first exhaust system, and the furnace of the heating furnace is provided in the second exhaust system A furnace pressure damper for controlling the pressure is provided, the first exhaust system and the second exhaust system are connected to one chimney, and the combustion exhaust gas is joined and discharged from this chimney.

このような排気設備を備えた加熱炉では、蓄熱式バーナの蓄熱体で、該蓄熱式バーナから発生する燃焼排ガスの約８０％を排熱回収している。しかし、連続燃焼バーナで発生する燃焼排ガスは、排熱回収することなく、全て炉尻から炉外へと排出している。このため、加熱炉の炉尻から排出される燃焼排ガスには大きな排熱が存在することになる。   In a heating furnace equipped with such an exhaust facility, about 80% of the combustion exhaust gas generated from the regenerative burner is exhausted and recovered by the heat storage body of the regenerative burner. However, the exhaust gas generated in the continuous combustion burner is exhausted from the furnace bottom to the outside of the furnace without recovering exhaust heat. For this reason, large exhaust heat exists in the combustion exhaust gas discharged from the bottom of the heating furnace.

この加熱炉の炉尻から排出される燃焼排ガスから排熱回収するためにレキュペレータを設けることが行われている。しかし、このレキュペレータで発生する圧損を補償してドラフトを確保するために、このレキュペレータと煙突との間に誘引ファンを設けたり、煙突の高さを１００ｍ以上確保したりする必要があるため、このような排気設備の建設費が高くなるといった問題が発生してしまう。   In order to recover exhaust heat from the combustion exhaust gas discharged from the bottom of the heating furnace, a recuperator is provided. However, in order to compensate for the pressure loss generated in this recuperator and to secure a draft, it is necessary to provide an induction fan between this recuperator and the chimney, or to ensure the height of the chimney to be 100 m or more. Such a problem arises that the construction cost of the exhaust equipment becomes high.

そこで、本発明は、このような従来の事情に鑑みて提案されたものであり、連続燃焼バーナと蓄熱式バーナとを備えた加熱炉の排気設備において、排気設備の設備費の低減化を実現可能とすることを目的とする。   Therefore, the present invention has been proposed in view of such conventional circumstances, and in the exhaust equipment of a heating furnace equipped with a continuous combustion burner and a heat storage type burner, the equipment cost of the exhaust equipment is reduced. The purpose is to make it possible.

上記課題を解決することを目的とした本発明の要旨は以下の通りである。
（１） 炉内を連続的に燃焼する連続燃焼バーナと、炉内で燃焼と排気とを交互に繰り返しながら、排気時に燃焼排ガスの排熱を蓄熱体によって蓄熱回収し、燃焼時に蓄熱体に蓄熱された熱によって燃焼空気を予熱する蓄熱式バーナとを備えた加熱炉の排気設備であって、
前記加熱炉内の燃焼排ガスを前記蓄熱式バーナの蓄熱体、吸引ファンを順次介して排出する第１の排気系と、
前記加熱炉内の燃焼排ガスを前記加熱炉の炉尻側からドラフト（自然通風）によって排出する第２の排気系と、前記第１の排気系及び前記第２の排気系から排出される燃焼排ガスを大気中に放散する１本の煙突と、
前記第２の排気系から排出される燃焼排ガスの排熱を回収して前記連続燃焼バーナに供給する燃焼空気を予熱する熱交換手段とを備え、
前記加熱炉に設置された全バーナの燃焼量に対する前記連続燃焼バーナの燃焼量の割合が１０容量％以上、５０容量％以下であり、前記煙突の高さが４５ｍ以上６０ｍ未満であることを特徴とする加熱炉の排気設備。
（２） 前記連続燃焼バーナとして、ルーフバーナ、サイドバーナ、軸流バーナの何れか１種又は２種以上を備えることを特徴とする前記（１）に記載の加熱炉の排気設備。
（３） 前記熱交換手段として、レキュペレータを用い、このレキュぺレータの圧損が１０ｍｍＨ２Ｏ以上２０ｍｍＨ２Ｏ以下であることを特徴とする前記（１）又は（２）に記載の加熱炉の排気設備。 The gist of the present invention aimed at solving the above problems is as follows.
(1) Continuous combustion burner that continuously burns in the furnace, and combustion and exhaust are alternately repeated in the furnace, and the exhaust heat of the combustion exhaust gas is stored and recovered by the heat storage body during exhaust, and is stored in the heat storage body during combustion. An exhaust system for a heating furnace including a regenerative burner that preheats combustion air with the generated heat,
A first exhaust system for exhausting the combustion exhaust gas in the heating furnace through the heat storage body of the regenerative burner and the suction fan sequentially;
A second exhaust system that exhausts the combustion exhaust gas in the heating furnace from the furnace bottom side of the heating furnace by a draft (natural ventilation), and the combustion exhaust gas that is exhausted from the first exhaust system and the second exhaust system A chimney that radiates to the atmosphere,
A heat exchanging means for recovering exhaust heat of the combustion exhaust gas discharged from the second exhaust system and preheating the combustion air supplied to the continuous combustion burner,
The ratio of the combustion amount of the continuous combustion burner to the combustion amount of all the burners installed in the heating furnace is 10 volume% or more and 50 volume% or less, and the height of the chimney is 45 m or more and less than 60 m. Heating furnace exhaust equipment.
(2) The exhaust equipment for a heating furnace according to (1), wherein the continuous combustion burner includes one or more of a roof burner, a side burner, and an axial flow burner.
(3) A recuperator is used as the heat exchange means, and the pressure loss of the recuperator is not less than 10 mmH 2 O and not more than 20 mmH 2 O. Exhaust of the heating furnace as described in (1) or (2) above Facility.

本発明によれば、加熱炉の燃焼排ガスを大気中に放散するのに必要な高さである４５ｍ以上で、かつ、建設費が大幅に増加しない高さ６０ｍ以下の煙突で得られる自然通風可能な領域で、連続燃焼バーナにおける燃焼量の比率を設定したので、その分、第１の排気系に接続された吸引ファンの容量を低減可能となり、該吸引ファンの設備コスト（ランニングコストを含む）を低減できる。   According to the present invention, natural ventilation is possible with a chimney having a height of 45 m or more, which is a height necessary for dissipating combustion exhaust gas from a heating furnace into the atmosphere, and a height of 60 m or less, which does not significantly increase the construction cost. Since the ratio of the combustion amount in the continuous combustion burner is set in such a range, the capacity of the suction fan connected to the first exhaust system can be reduced correspondingly, and the equipment cost of the suction fan (including the running cost) Can be reduced.

以下、本発明を適用した加熱炉の排気設備について、図面を参照して詳細に説明する。
本実施形態では、図１に示すような熱間圧延設備の連続式加熱炉１に本発明の排気設備を適用した場合を例に挙げて説明する。 Hereinafter, an exhaust system of a heating furnace to which the present invention is applied will be described in detail with reference to the drawings.
In this embodiment, the case where the exhaust equipment of the present invention is applied to the continuous heating furnace 1 of the hot rolling equipment as shown in FIG. 1 will be described as an example.

熱間圧延設備の連続式加熱炉（以下、加熱炉という。）１は、炉内に装入された被加熱材であるスラブ（鋳片）を、搬送手段であるウォーキングビームによって矢印方向に搬送しながら、炉内の予熱帯、加熱帯、均熱帯を順次通過する間に、炉内に設置されたバーナによって所定温度まで加熱するものであり、所定温度まで加熱されたスラブは加熱炉１から抽出され、次工程の圧延ラインへと送られる。   A continuous heating furnace (hereinafter referred to as a heating furnace) 1 of a hot rolling facility conveys a slab (slab), which is a material to be heated, placed in the furnace in the direction of an arrow by a walking beam as a conveying means. However, the slab heated to a predetermined temperature is heated from the heating furnace 1 by a burner installed in the furnace while sequentially passing through the pre-tropical zone, heating zone, and soaking zone in the furnace. It is extracted and sent to the rolling line of the next process.

この加熱炉１には、炉内を連続的に加熱する連続燃焼バーナ２と炉内で燃焼と排気とを交互に繰り返しながら排気時に燃焼排ガスの排熱を蓄熱体によって排熱回収し、燃焼時に、蓄熱体に蓄熱された熱によって燃焼空気を予熱する蓄熱式バーナ３とが設置されている。   The heating furnace 1 includes a continuous combustion burner 2 that continuously heats the inside of the furnace, and combustion and exhaust gas are alternately repeated in the furnace, and exhaust heat of the exhaust gas from the exhaust gas is exhausted and recovered by a heat accumulator during exhaust. A regenerative burner 3 that preheats combustion air with heat stored in the heat accumulator is installed.

連続燃焼バーナ２は、例えば加熱炉１の上部に炉幅方向に並んで配置されたルーフバーナであり、このルーフバーナは、スラブ長手方向の温度分布を目標温度分布（均一又は傾斜）にするため、加熱炉１の出側の上部、具体的には均熱帯の上部に設置されている。なお、連続燃焼バーナ２としては、ルーフバーナ以外にも、加熱炉１の側部に配置されるサイドバーナや、加熱炉１の上部又は下部に炉長方向に沿って配置される軸流バーナなどを挙げることができ、これらの連続燃焼バーナ２を１種又は２種以上用いることができる。また、これらの連続燃焼バーナ２は、上述した配置に限らず予熱帯、加熱帯、均熱帯の何れかの上部下部又は側部に任意に設置することも可能である。   The continuous combustion burner 2 is, for example, a roof burner arranged in the upper part of the heating furnace 1 in the furnace width direction. This roof burner is heated to make the temperature distribution in the longitudinal direction of the slab a target temperature distribution (uniform or inclined). It is installed in the upper part of the exit side of the furnace 1, specifically, the upper part of the soaking zone. In addition to the roof burner, the continuous combustion burner 2 includes a side burner arranged at the side of the heating furnace 1, an axial flow burner arranged along the furnace length direction at the upper or lower part of the heating furnace 1, and the like. These continuous combustion burners 2 can be used singly or in combination of two or more. Moreover, these continuous combustion burners 2 are not limited to the above-described arrangement, and can be arbitrarily installed on the upper lower part or the side part of any one of the pretropical zone, the heating zone, and the soaking zone.

蓄熱式バーナ３は、蓄熱体を備えた一対のバーナを加熱炉１の側部に対向配置されてなり、これら一対のバーナが燃焼と排気とを交互に繰り返しながら、一方のバーナの燃焼により発生した燃焼排ガスを他方のバーナの蓄熱体に通過させることによってその燃焼排ガス中の排熱を蓄熱体に蓄熱し、他方のバーナが燃焼する際に、この蓄熱体に燃焼空気を通過させることによって燃焼空気を予熱するようになされている。この蓄熱式バーナ３は、加熱炉１の予熱帯及び加熱帯の側部において、搬送するスラブを挟んだ上部側と下部側とにそれぞれ設置されている。さらに、この蓄熱式バーナ３は、加熱炉１の均熱帯の側部において、搬送するスラブを挟んだ下部側に設置されている。なお、蓄熱式バーナ３は、上述した配置に限らず、予熱帯、加熱帯、均熱帯の何れかの側部に任意に設置することができる。   The regenerative burner 3 is formed by arranging a pair of burners provided with heat accumulators so as to face the side of the heating furnace 1, and the pair of burners are generated by combustion of one burner while alternately repeating combustion and exhaust. The exhaust gas in the combustion exhaust gas is stored in the heat storage body by passing the burned exhaust gas through the heat storage body of the other burner, and when the other burner burns, the combustion air is passed through the heat storage body. It is designed to preheat the air. The regenerative burner 3 is installed on the upper side and the lower side across the slab to be transported in the pre-tropics and the side of the heating zone of the heating furnace 1, respectively. Furthermore, the regenerative burner 3 is installed on the side of the soaking zone of the heating furnace 1 on the lower side across the slab to be conveyed. The regenerative burner 3 is not limited to the above-described arrangement, and can be arbitrarily installed on any side of the pre-tropical zone, heating zone, and soaking zone.

加熱炉１は、その排気設備として、炉内の燃焼排ガスを蓄熱式バーナ３を介して排出する第１の排気系４と、炉内の燃焼排ガスを炉尻側から排出する第２の排気系５と、第１の排気系４及び第２の排気系５から排出される燃焼排ガスを炉外に排出する１本の煙突６と、加熱炉１内の燃焼排ガスを第１の排気系４に誘引する排ガス誘引手段である誘引ファン（ＩＤＦ）７と、第２の排気系５に接続された炉圧制御手段である炉圧ダンパ８と、第２の排気系５から排出される燃焼排ガスの排熱を回収して燃焼空気を予熱する熱交換手段であるレキュぺレータ９とを備えている。   The heating furnace 1 has, as its exhaust equipment, a first exhaust system 4 that exhausts combustion exhaust gas in the furnace via a regenerative burner 3 and a second exhaust system that exhausts combustion exhaust gas in the furnace from the furnace bottom side. 5, one chimney 6 for discharging the combustion exhaust gas discharged from the first exhaust system 4 and the second exhaust system 5 to the outside of the furnace, and the combustion exhaust gas in the heating furnace 1 to the first exhaust system 4 An induction fan (IDF) 7 which is an exhaust gas attracting means for attracting, a furnace pressure damper 8 which is a furnace pressure control means connected to the second exhaust system 5, and combustion exhaust gas discharged from the second exhaust system 5 And a recuperator 9 which is a heat exchange means for recovering exhaust heat and preheating combustion air.

第１の排気系４は、加熱炉１に設置された各蓄熱式バーナ３から排出される燃焼排ガスを煙突６へと導くものである。第２の排気系５は、加熱炉１の炉尻から排出する燃焼排ガスを煙突６へと導くものである。煙突６は、これら第１の排気系４及び第２の排気系５から排出される燃焼排ガスを合流して外部に放出する。   The first exhaust system 4 guides the combustion exhaust gas discharged from each regenerative burner 3 installed in the heating furnace 1 to the chimney 6. The second exhaust system 5 guides the combustion exhaust gas discharged from the bottom of the heating furnace 1 to the chimney 6. The chimney 6 joins the combustion exhaust gas discharged from the first exhaust system 4 and the second exhaust system 5 and discharges them to the outside.

また、第１の排気系４には、流量測定器（図示せず。）用のオリフィス１１と、排ガス量を調整するための流量調節弁１２とが設けられ、これらオリフィス１１と流量調節弁１２とを介して誘引ファン７により蓄熱式バーナ３からの燃焼排ガスを煙突６へと送り込む。   The first exhaust system 4 is provided with an orifice 11 for a flow rate measuring device (not shown) and a flow rate adjusting valve 12 for adjusting the amount of exhaust gas. These orifice 11 and the flow rate adjusting valve 12 are provided. Then, the flue gas from the regenerative burner 3 is sent to the chimney 6 by the induction fan 7.

炉圧ダンバ８は、煙突６とレキュぺレータ９との間に配置されて、煙突６への合流部の圧力が煙突６のドラフトとバランスするように加熱炉１の炉圧を制御するものである。   The furnace pressure damper 8 is disposed between the chimney 6 and the recuperator 9 and controls the furnace pressure of the heating furnace 1 so that the pressure at the junction with the chimney 6 is balanced with the draft of the chimney 6. is there.

レキュペレータ９は、第２の排気系５から排出される燃焼排ガスの排熱を回収し、燃焼空気ファン１０により導入された燃焼空気を予熱する。そして、この予熱された燃焼空気は連続燃焼バーナ２に供給される。   The recuperator 9 recovers the exhaust heat of the combustion exhaust gas discharged from the second exhaust system 5 and preheats the combustion air introduced by the combustion air fan 10. The preheated combustion air is supplied to the continuous combustion burner 2.

また、上述したように１本の煙突６から第１の排気系４及び第２の排気系５から排出される燃焼排ガスを加熱炉１の炉外に排出しており、この煙突６の高さは、ＮＯｘ、ＳＯｘ、ＣＯ２の着地濃度を満足する最低の高さである４５ｍ以上を確保する必要がある。また、航空法による航空障害灯の設置等の義務付けがない６０ｍ未満とすることによってその建設費を大幅に低く抑えることが可能である。 Further, as described above, the combustion exhaust gas discharged from the first exhaust system 4 and the second exhaust system 5 from one chimney 6 is discharged outside the furnace 1, and the height of the chimney 6 Therefore, it is necessary to secure a minimum height of 45 m or more that satisfies the landing concentration of NOx, SOx, and CO 2 . In addition, the construction cost can be significantly reduced by setting it to less than 60 m, which is not obliged to install an aviation obstruction light according to the Aviation Law.

一方、連続燃焼バーナ２に対する蓄熱式バーナ３の設置比率が高くなるに従って、蓄熱式バーナ３からの燃焼排ガス量が多くなって容量の大きい誘引ファン７が必要となり、イニシャルコスト（設備費）、ランニングコスト（消費電力費用）が高くなる。   On the other hand, as the installation ratio of the regenerative burner 3 with respect to the continuous combustion burner 2 increases, the amount of combustion exhaust gas from the regenerative burner 3 increases and the induction fan 7 having a large capacity is required. Cost (power consumption cost) becomes high.

この両者のことから、煙突６の必要高さ（４５ｍ以上、６０ｍ未満）で発生するドラフト力を利用できる範囲内での連続燃焼バーナ２の燃焼量比率とし、それ以外を蓄熱式バーナ３とすることにより、該第１の排気系４に設置されている吸引ブロワ７の容量を小さくすることが可能となり、吸引ブロワ７のイニシャルコスト、ランニングコストを低減することができる。   From both of these, the combustion amount ratio of the continuous combustion burner 2 within a range in which the draft force generated at the required height (45 m or more and less than 60 m) of the chimney 6 can be used, and the other is the regenerative burner 3. Thus, the capacity of the suction blower 7 installed in the first exhaust system 4 can be reduced, and the initial cost and running cost of the suction blower 7 can be reduced.

このため、本発明は、加熱炉１内の全バーナに対する連続燃焼バーナ２の燃焼量の割合を１０％以上、５０％以下とするものである。つまり、連続燃焼バーナ２の燃焼量の割合が１０％未満であると、煙突６のドラフトに余裕が出来ると共に吸引ブロワ７の容量を大幅に低減できない。一方、５０％を超えると吸引ブロワ７の容量は大幅に低減するが、煙突６のドラフトが不足して、煙突６の高さを６０ｍ以上にすることが必要となる。 For this reason, this invention makes the ratio of the combustion quantity of the continuous combustion burner 2 with respect to all the burners in the heating furnace 1 10% or more and 50 % or less. That is, if the ratio of the combustion amount of the continuous combustion burner 2 is less than 10%, the draft of the chimney 6 can be afforded and the capacity of the suction blower 7 cannot be significantly reduced. On the other hand, if it exceeds 50%, the capacity of the suction blower 7 is greatly reduced, but the draft of the chimney 6 is insufficient, and the height of the chimney 6 needs to be 60 m or more.

また、本発明を適用した加熱炉１の排気設備では、第２の排気系５に設けたレキュペレータ９は、低圧損型とし、その圧損が１０ｍｍＨ２Ｏ以上２０ｍｍＨ２Ｏ以下（ｍｍＨ２Ｏ＝９．８Ｐａ）のものを用いることが、煙突６の高さを４５ｍに近づけることが可能となり好ましい。 Also, in the exhaust system of the heating furnace 1 according to the present invention, recuperator 9 provided in the second exhaust system 5, a low pressure loss, the pressure loss is 10 mm H 2 O or more 20 mm H 2 O or less (mmH 2 O = 9 .8 Pa) is preferable because the height of the chimney 6 can be close to 45 m.

なお本発明は、上述した熱間圧延設備の連続式加熱炉１に本発明の排気設備を適用した場合に限らず、連続燃焼バーナと蓄熱式バーナとを備えた加熱炉において本発明の排気設備を幅広く適用することが可能であり、これにより加熱炉の排気設備の低コスト化を実現することが可能である。   The present invention is not limited to the case where the exhaust system of the present invention is applied to the above-described continuous heating furnace 1 of the hot rolling facility, and the exhaust system of the present invention is provided in a heating furnace including a continuous combustion burner and a heat storage type burner. Can be widely applied, and thereby, it is possible to reduce the cost of the exhaust equipment of the heating furnace.

以下、本発明は、以下の実施例に限定されるものではなくその要旨を変更しない範囲で適宜変更して実施することができる。   Hereinafter, the present invention is not limited to the following examples, and can be implemented with appropriate modifications without departing from the scope of the present invention.

表１に本発明における実施例と比較例を示す。これは図１に示す加熱炉１を用いて、該加熱炉１の均熱帯の上部の炉幅方向に設置した連続燃焼バーナ２と、その他の部位に設置した蓄熱式バーナ３に供給する燃料量を変更した際における、煙突６の高さと吸引ファン７の吸引力を求めた例である。   Table 1 shows examples and comparative examples in the present invention. This is the amount of fuel supplied to the continuous combustion burner 2 installed in the furnace width direction at the upper part of the soaking zone of the heating furnace 1 and the regenerative burner 3 installed in other parts using the heating furnace 1 shown in FIG. This is an example in which the height of the chimney 6 and the suction force of the suction fan 7 are obtained when the above is changed.

Figure 0005211943
Figure 0005211943

実施例１及び実施例２では、連続燃焼バーナ２の燃焼割合が本発明の範囲内にすることにより、煙突６の高さを本発明の範囲内にすることができ、しかも、誘引ファン７の必要吸引力を１０００ｍｍＨ２Ｏにすることができた。しかし、実施例２では、レキュペレータ９の圧損が請求項３の範囲を外れたため、実施例１に比較して、煙突６の高さが若干高くなった。 In Example 1 and Example 2, the height of the chimney 6 can be within the range of the present invention by setting the combustion rate of the continuous combustion burner 2 within the range of the present invention. The required suction force could be 1000 mmH 2 O. However, in Example 2, since the pressure loss of the recuperator 9 was out of the range of claim 3, the height of the chimney 6 was slightly higher than that in Example 1.

一方、比較例１では、連続燃焼バーナ２の燃焼割合が本発明の上限を外れたので、煙突６の高さが本発明の範囲より高くなった。また、比較例２では、連続燃焼バーナ２の燃焼割合が本発明の下限を外れたので、非常に大きな誘引ファン７の吸引力が必要となった。   On the other hand, in Comparative Example 1, since the combustion ratio of the continuous combustion burner 2 deviated from the upper limit of the present invention, the height of the chimney 6 became higher than the range of the present invention. Moreover, in the comparative example 2, since the combustion rate of the continuous combustion burner 2 deviated from the lower limit of the present invention, a very large suction force of the induction fan 7 was required.

図１は、本発明を適用した加熱炉の排気設備を示す模式図である。FIG. 1 is a schematic diagram showing an exhaust facility of a heating furnace to which the present invention is applied.

符号の説明Explanation of symbols

１：加熱炉
２：連続燃焼バーナ
３：蓄熱式バーナ
４：第１の排気系
５：第２の排気系
６：煙突
７：誘引ファン
８：炉圧ダンパ
９：レキュペレータ 1: Heating furnace
2: Continuous combustion burner
3: Regenerative burner
4: First exhaust system
5: Second exhaust system 6: Chimney
7: Attraction fan
8: Furnace pressure damper
9: Recuperator

Claims (3)

炉内を連続的に燃焼する連続燃焼バーナと、炉内で燃焼と排気とを交互に繰り返しながら、排気時に燃焼排ガスの排熱を蓄熱体によって蓄熱回収し、燃焼時に蓄熱体に蓄熱された熱によって燃焼空気を予熱する蓄熱式バーナとを備えた加熱炉の排気設備であって、
前記加熱炉内の燃焼排ガスを前記蓄熱式バーナの蓄熱体、吸引ファンを順次介して排出する第１の排気系と、
前記加熱炉内の燃焼排ガスを前記加熱炉の炉尻側からドラフトによって排出する第２の排気系と、
前記第１の排気系及び前記第２の排気系から排出される燃焼排ガスを大気中に放散する１本の煙突と、
前記第２の排気系から排出される燃焼排ガスの排熱を回収して前記連続燃焼バーナに供給する燃焼空気を予熱する熱交換手段とを備え、
前記加熱炉に設置された全バーナの燃焼量に対する前記連続燃焼バーナの燃焼量の割合が１０容量％以上、５０容量％以下であり、前記煙突の高さが４５ｍ以上６０ｍ未満であることを特徴とする加熱炉の排気設備。 While continuously repeating combustion in the furnace and combustion and exhaust in the furnace alternately, the exhaust heat of the combustion exhaust gas is stored and recovered by the heat storage body during exhaust, and the heat stored in the heat storage body during combustion An exhaust system of a heating furnace provided with a regenerative burner for preheating combustion air by
A first exhaust system for exhausting the combustion exhaust gas in the heating furnace through the heat storage body of the regenerative burner and the suction fan sequentially;
A second exhaust system for exhausting the combustion exhaust gas in the heating furnace from the furnace bottom side of the heating furnace by a draft;
A single chimney that diffuses the combustion exhaust gas discharged from the first exhaust system and the second exhaust system into the atmosphere;
A heat exchanging means for recovering exhaust heat of the combustion exhaust gas discharged from the second exhaust system and preheating the combustion air supplied to the continuous combustion burner,
The ratio of the combustion amount of the continuous combustion burner to the combustion amount of all the burners installed in the heating furnace is 10 volume% or more and 50 volume% or less, and the height of the chimney is 45 m or more and less than 60 m. Heating furnace exhaust equipment. 前記連続燃焼バーナとして、ルーフバーナ、サイドバーナ、軸流バーナの何れか１種又は２種以上を備えることを特徴とする請求項１に記載の加熱炉の排気設備。   The exhaust equipment for a heating furnace according to claim 1, wherein the continuous combustion burner comprises one or more of a roof burner, a side burner, and an axial flow burner. 前記熱交換手段として、レキュペレータを用い、このレキュペレータの圧損が１０ｍｍＨ２Ｏ以上２０ｍｍＨ２Ｏ以下であることを特徴とする請求項１又は２に記載の加熱炉の排気設備。 The exhaust equipment for a heating furnace according to claim 1 or 2, wherein a recuperator is used as the heat exchange means, and the pressure loss of the recuperator is not less than 10 mmH 2 O and not more than 20 mmH 2 O.
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