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JP5696421B2 - Operation method of furnace equipment - Google Patents

Operation method of furnace equipment Download PDF

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JP5696421B2
JP5696421B2 JP2010229484A JP2010229484A JP5696421B2 JP 5696421 B2 JP5696421 B2 JP 5696421B2 JP 2010229484 A JP2010229484 A JP 2010229484A JP 2010229484 A JP2010229484 A JP 2010229484A JP 5696421 B2 JP5696421 B2 JP 5696421B2
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heat
furnace
fuel gas
combustion air
combustion
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JP2012083025A (en
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壁矢　和久
和久 壁矢
高志 黒木
高志 黒木
伸行 紫垣
伸行 紫垣
藤林　晃夫
晃夫 藤林
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JFE Steel 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
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/40—Solar thermal energy, e.g. solar towers
    • 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
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/10—Process efficiency
    • Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines

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Description

本発明は、熱風炉、コークス炉、加熱炉などのような炉設備の操業方法に関するもので、詳細には、炉設備で使用する燃焼用空気や燃料ガスを適切に予熱し、炉設備の熱効率を向上させるための操業方法に関する。   The present invention relates to a method for operating a furnace facility such as a hot stove, coke oven, heating furnace, etc., and more specifically, appropriately preheats combustion air and fuel gas used in the furnace facility, and heat efficiency of the furnace facility It is related with the operation method for improving.

ＣＯ２排出削減に向け、製鉄所において省エネルギーのニーズが高まっている。特に、高炉用の熱風炉では製鉄所全体の１割近くのエネルギーを消費しており、省エネルギー化の重要度は高い。
熱風炉の熱効率を向上させるために、例えば、特許文献１では、燃焼排ガスの顕熱を回収して燃焼用空気や燃料ガスを予熱することにより、熱効率の向上を図っている。また、特許文献２のように、燃料ガスである高炉ガス（Ｂガス）とコークス炉ガス（Ｃガス）の混合比率と燃焼用空気量を最適化することで、高効率燃焼を実現し、熱効率の向上を図る取り組みもなされている。 There is a growing need for energy conservation at steelworks to reduce CO 2 emissions. In particular, a hot blast furnace for a blast furnace consumes nearly 10% of the energy of the entire steelworks, and the importance of energy saving is high.
In order to improve the thermal efficiency of the hot stove, for example, in Patent Document 1, the sensible heat of the combustion exhaust gas is recovered and the combustion air and fuel gas are preheated to improve the thermal efficiency. Moreover, as in Patent Document 2, high efficiency combustion is realized by optimizing the mixing ratio of the blast furnace gas (B gas) and the coke oven gas (C gas), which are fuel gases, and the amount of combustion air, and thermal efficiency. Efforts to improve the quality are also being made.

特開昭６２−１７１０８号公報JP 62-17108 A 特開平９−２０９０１５号公報JP-A-9-209015

しかし、燃焼排ガスの顕熱により燃焼用空気や燃料ガスを予熱する方法では、燃焼用空気の温度は高々１５０℃程度にしかならないため、大幅な熱効率の向上は望めない。
また、燃料ガスであるＢガスとＣガスの混合比率は製鉄所の操業状態で制約を受けるため、必ずしも最適な比率にできないことも多く、大幅な熱効率向上につながるとは言い難い。 However, in the method in which combustion air and fuel gas are preheated by sensible heat of combustion exhaust gas, the temperature of the combustion air is only about 150 ° C., so a significant improvement in thermal efficiency cannot be expected.
In addition, since the mixing ratio of B gas and C gas, which are fuel gases, is restricted by the operating conditions of the steel mill, it is not always possible to achieve an optimal ratio, and it is difficult to say that it leads to a significant improvement in thermal efficiency.

したがって本発明の目的は、製鉄所内の熱風炉、コークス炉、加熱炉などのような炉設備の熱効率を大幅に向上させることが可能な操業方法を提供することにある。   Accordingly, an object of the present invention is to provide an operation method capable of greatly improving the thermal efficiency of furnace equipment such as a hot blast furnace, a coke oven, and a heating furnace in an ironworks.

上記課題を解決するための本発明の要旨は、燃料ガスの燃焼熱を熱源に利用する製鉄所内の炉設備であって、高炉用の熱風炉、コークス炉、鋼材加熱用の加熱炉のいずれかの炉設備において、製鉄プロセスで発生する副生ガスを燃料ガスとして用いる際に、燃焼用空気及び燃料ガスを、集光装置で集光した太陽光の熱で直接予熱するとともに、この太陽光の熱による予熱の前又は後に、炉設備の燃焼排ガスの顕熱により予熱する炉設備の操業方法であって、前記集光装置は太陽光を反射して集光する複数の反射鏡を備えるとともに、該複数の反射鏡の集光先には、燃焼用空気及び燃料ガスの予熱器を構成するタンクが設けられ、該タンクには、燃焼用空気及び燃料ガスが蓄えられるとともに、配管を通じて燃焼用空気及び燃料ガスが導入・排出され、太陽光を前記複数の反射鏡により前記タンクに集光することで、該タンク内の燃焼用空気及び燃料ガスを加熱することを特徴とする炉設備の操業方法である。 The gist of the present invention for solving the above problems is a furnace facility in an ironworks that uses the combustion heat of fuel gas as a heat source, and is one of a hot blast furnace for a blast furnace, a coke oven, and a heating furnace for heating steel materials. When the by-product gas generated in the iron making process is used as fuel gas, the combustion air and the fuel gas are directly preheated with the heat of the sunlight collected by the light concentrator and before or after preheating by heat, a operation method of a furnace facility that preheated by sensible heat of the combustion exhaust gas of the furnace equipment, together with the focusing device comprises a plurality of reflectors for condensing and reflecting the sunlight, The condensing destinations of the plurality of reflecting mirrors are provided with a tank that constitutes a preheater for combustion air and fuel gas. The tank stores combustion air and fuel gas, and combustion air through a pipe. And fuel gas introduced / exhausted It is, by focusing the solar light to the tank by the plurality of reflecting mirrors, which is operating method of the furnace equipment, which comprises heating the combustion air and fuel gas in the tank.

本発明によれば、炉設備の燃焼用空気や燃料ガスの予熱に太陽光を用いるので、集光量を増やすことにより、従来に比べて予熱温度を高めることができる。このため炉設備の燃料原単位を低減し、炉設備の熱効率を大幅に高めることができる。さらに、太陽光は自然エネルギーであるため、ランニングコストが非常に小さくて済むという効果もある。   According to the present invention, since sunlight is used for preheating combustion air and fuel gas in the furnace facility, the preheating temperature can be increased by increasing the amount of collected light. For this reason, the fuel consumption rate of the furnace equipment can be reduced, and the thermal efficiency of the furnace equipment can be greatly increased. Furthermore, since sunlight is natural energy, there is an effect that the running cost can be very small.

本発明の炉設備の操業方法の一実施形態を示す説明図Explanatory drawing which shows one Embodiment of the operating method of the furnace installation of this invention 本発明の炉設備の操業方法の他の実施形態を示す説明図Explanatory drawing which shows other embodiment of the operating method of the furnace installation of this invention 本発明における太陽熱による燃焼用空気などの予熱方法及び設備の一実施形態を示す説明図Explanatory drawing which shows one Embodiment of the preheating methods and facilities, such as combustion air by the solar heat in this invention 本発明における太陽熱による燃焼用空気などの予熱方法及び設備の他の実施形態を示す説明図Explanatory drawing which shows other embodiment of the preheating method and facilities, such as combustion air by the solar heat, in this invention 本発明の炉設備の操業方法の他の実施形態を示す説明図Explanatory drawing which shows other embodiment of the operating method of the furnace installation of this invention 従来技術による燃焼用空気などの予熱方法の代表例を示す説明図Explanatory drawing showing a typical example of a preheating method such as combustion air according to the prior art

本発明が対象とする炉設備は、製鉄プロセスで発生する副生ガスを燃料ガスとし、この燃料ガスの燃焼熱を熱源に利用する炉設備である。このような炉設備としては、例えば、製鉄所における高炉用の熱風炉、コークス炉、鋼材加熱用の加熱炉などが挙げられるが、これらに限定されるものではない。
また、炉設備において燃料ガスとして用いられる製鉄プロセスで発生する副生ガスとしては、コークス炉ガス、高炉ガス、転炉ガスなどが挙げられ、これらのいずれか又は２種以上の混合ガスが燃料ガスとして用いられる。 The furnace equipment to which the present invention is directed is furnace equipment that uses by-product gas generated in the iron making process as fuel gas and uses the combustion heat of this fuel gas as a heat source. Examples of such furnace equipment include, but are not limited to, a hot blast furnace for a blast furnace, a coke oven, a heating furnace for heating steel materials, and the like at an ironworks.
In addition, examples of the by-product gas generated in the iron making process used as the fuel gas in the furnace equipment include coke oven gas, blast furnace gas, converter gas, and the like. Used as

図６は、従来技術に関するもので、上記のような炉設備に使用する燃焼用空気や燃料ガスの予熱方法の代表例を示している。この炉設備は、炉１に供給される燃焼用空気や燃料ガスを予熱するための予熱器９を有している。この予熱器９には、炉１で生じた燃焼排ガスが供給され、この燃焼排ガスとの熱交換により燃焼用空気や燃料ガスが予熱される。この予熱により、燃焼温度を上げて目標温度への到達時間を短縮し、燃料使用量を削減することにより、省エネを図るものである。   FIG. 6 relates to the prior art, and shows a typical example of a method for preheating combustion air and fuel gas used in the above furnace equipment. This furnace facility has a preheater 9 for preheating combustion air and fuel gas supplied to the furnace 1. Combustion exhaust gas generated in the furnace 1 is supplied to the preheater 9, and combustion air and fuel gas are preheated by heat exchange with the combustion exhaust gas. By this preheating, the combustion temperature is raised, the time to reach the target temperature is shortened, and the amount of fuel used is reduced, thereby saving energy.

このような従来法に対して、本発明法では、炉設備で使用する燃焼用空気及び／又は燃料ガスを、太陽光を集光して得られた熱で予熱するものである。このような予熱は、従来法と同様の燃焼排ガスによる予熱を併用してもよい。
本発明では、太陽光を集めるのに集光装置（集光板）を用いるが、熱風炉、コークス炉、加熱炉などのような製鉄プロセスの炉設備を対象とする場合、一般に製鉄所は広大な敷地を有していることが多いため、大量の太陽光を集めるのに必要な大面積の集光板を設置しやすいという利点がある。すなわち、本発明は製鉄所のスペースを有効利用する形で実施することができる。 In contrast to such a conventional method, in the method of the present invention, the combustion air and / or fuel gas used in the furnace equipment is preheated with heat obtained by collecting sunlight. Such preheating may be combined with preheating by combustion exhaust gas similar to the conventional method.
In the present invention, a light collecting device (light collecting plate) is used to collect sunlight. However, in the case where a furnace for a steel making process such as a hot stove, a coke oven, a heating furnace or the like is targeted, the steelworks are generally vast. Since there are many sites, there is an advantage that it is easy to install a large-area light collector necessary for collecting a large amount of sunlight. That is, the present invention can be implemented in a manner that effectively uses the space of the steelworks.

図１は、本発明の炉設備の操業方法の一実施形態を示すものである。
この実施形態では、燃焼用空気と燃料ガスをそれぞれ炉１に供給する流路２a，２bの途中に、太陽熱を熱源とする予熱器３xと、炉の燃焼排ガスを熱源とする予熱器５が設けられている。太陽光が集光装置４（集光板）で集光され、その熱（太陽熱）が予熱器３xに供給され、また、炉１の燃焼排ガスが予熱器５に供給される。なお、流路２a，２bに設けられる予熱器は、上流側から予熱器５（炉の燃焼排ガスを熱源とする予熱器）、予熱器３x（太陽熱を熱源とする予熱器）の順で設けてもよい。
流路２a，２bにより炉１に供給される燃焼用空気と燃料ガスは、予熱器３xにおいて太陽熱で予熱され、さらに予熱器５において燃焼排ガスの顕熱で予熱された後、炉１に送られ、燃焼のために用いられる。本実施形態では、従来法と同様の燃焼排ガスの顕熱による予熱に加え、太陽熱による予熱がなされるので、燃焼用空気と燃料ガスを高温に予熱することができる。なお、予熱は燃焼用空気と燃料ガスのうちのいずれか一方のみを対象としてもよい。 FIG. 1 shows an embodiment of a method for operating a furnace facility according to the present invention.
In this embodiment, a preheater 3x using solar heat as a heat source and a preheater 5 using furnace flue gas as a heat source are provided in the middle of flow paths 2a and 2b for supplying combustion air and fuel gas to the furnace 1, respectively. It has been. Sunlight is collected by the light collecting device 4 (light collecting plate), and the heat (solar heat) is supplied to the preheater 3x, and the combustion exhaust gas of the furnace 1 is supplied to the preheater 5. In addition, the preheater provided in the flow paths 2a and 2b is provided in the order of the preheater 5 (preheater using the combustion exhaust gas of the furnace as a heat source) and the preheater 3x (preheater using solar heat as the heat source) from the upstream side. Also good.
Combustion air and fuel gas supplied to the furnace 1 through the flow paths 2a and 2b are preheated with solar heat in the preheater 3x, and further preheated with sensible heat of the combustion exhaust gas in the preheater 5 and then sent to the furnace 1. Used for combustion. In this embodiment, in addition to preheating by sensible heat of combustion exhaust gas as in the conventional method, preheating by solar heat is performed, so that the combustion air and fuel gas can be preheated to a high temperature. Note that preheating may be performed on only one of combustion air and fuel gas.

図２は、本発明の炉設備の操業方法の他の実施形態を示すものである。
この実施形態では、燃焼用空気と燃料ガスをそれぞれ炉１に供給する流路２a，２bの途中に、太陽熱を熱源とする予熱器３xのみが設けられている。太陽光が集光装置４（集光板）で集光され、その熱（太陽熱）が予熱器３xに供給される。この場合、炉１の燃焼排ガスの排熱は捨ててしまうことになるが、太陽光の集光が十分であれば従来法以上の高温予熱が可能である。燃焼排ガスの排熱回収を行わないことにより、（i）燃焼排ガス用の予熱器（熱交換器）が不要となる、（ii）排熱回収に伴う圧力損失が抑制される、などの利点がある。
流路２a，２bにより炉１に供給される燃焼用空気と燃料ガスは、予熱器３xにおいて太陽熱で予熱された後、炉１に送られ、燃焼のために用いられる。なお、予熱は燃焼用空気と燃料ガスのうちのいずれか一方のみを対象としてもよい。 FIG. 2 shows another embodiment of the method for operating a furnace facility of the present invention.
In this embodiment, only a preheater 3x using solar heat as a heat source is provided in the middle of the flow paths 2a and 2b for supplying combustion air and fuel gas to the furnace 1, respectively. Sunlight is collected by the light collecting device 4 (light collecting plate), and the heat (solar heat) is supplied to the preheater 3x. In this case, the exhaust heat of the combustion exhaust gas from the furnace 1 is discarded, but if the sunlight is sufficiently collected, high temperature preheating higher than that of the conventional method is possible. By not performing exhaust heat recovery of combustion exhaust gas, there are advantages such as (i) no need for a preheater (heat exchanger) for combustion exhaust gas, and (ii) suppression of pressure loss due to exhaust heat recovery. is there.
Combustion air and fuel gas supplied to the furnace 1 through the flow paths 2a and 2b are preheated by solar heat in the preheater 3x, then sent to the furnace 1 and used for combustion. Note that preheating may be performed on only one of combustion air and fuel gas.

図３は、本発明における太陽熱による燃焼用空気などの予熱方法及び設備の一実施形態を示すもので、いわゆるトラフ式の集光装置４を用いたものである。すなわち、集光装置４はトラフ状の反射鏡４０を備え、この反射鏡前面の光の焦点部に、燃焼用空気や燃料ガスが通る配管３０が配され、この配管３０が予熱器３xを構成している。太陽光は反射鏡４０により配管３０（予熱器３x）に集光され、その熱で内部の燃焼用空気や燃料ガスが予熱される。   FIG. 3 shows one embodiment of a preheating method and equipment such as solar combustion air according to the present invention, in which a so-called trough-type condensing device 4 is used. That is, the condensing device 4 includes a trough-like reflecting mirror 40, and a pipe 30 through which combustion air and fuel gas pass is arranged at the focal point of the light in front of the reflecting mirror, and this pipe 30 constitutes the preheater 3x. doing. Sunlight is condensed on the pipe 30 (preheater 3x) by the reflecting mirror 40, and the internal combustion air and fuel gas are preheated by the heat.

反射鏡４０としては、例えば、特殊ガラスに銀メッキを施したもの、鋼板などの金属板に耐候性高反射アルミや反射フィルムを貼り付けたもの、鋼板などの金属板に特殊表面処理を施したもの、などを用いることができるが、波長４００ｎｍ〜２３００ｎｍ程度の広範囲で０．９５以上の反射率を有するものが特に望ましい。反射鏡４０の傾角は、その反射面が常に太陽に対向するように制御される。配管３０は通常の鋼管でもよいが、集熱効率を上げるためには、内管を鋼製、外管をガラス製の２重管構造とし、内管と外管の間を真空にした構造のものなどが好ましい。   As the reflecting mirror 40, for example, a special glass with silver plating, a metal plate such as a steel plate with a weather-resistant high-reflective aluminum or reflective film attached thereto, or a metal plate such as a steel plate with a special surface treatment. However, it is particularly desirable to have a reflectance of 0.95 or more in a wide range of wavelengths of about 400 nm to 2300 nm. The tilt angle of the reflecting mirror 40 is controlled so that the reflecting surface always faces the sun. The pipe 30 may be a normal steel pipe, but in order to increase the heat collection efficiency, the inner pipe is made of steel and the outer pipe is made of a double pipe structure, and the inner pipe and the outer pipe are evacuated. Etc. are preferable.

図４は、本発明における太陽熱による燃焼用空気などの予熱方法及び設備の他の実施形態を示すもので、集光装置４は複数の平板状の反射鏡４１（ヘリオスタット）を備え、これら反射鏡４１の集光先には燃焼用空気や燃料ガスが蓄えられるタンク３１が設けられ、このタンク３１が予熱器３xを構成している。太陽光は反射鏡４１によりタンク３１（予熱器３x）に集光され、その熱で内部の燃焼用空気や燃料ガスが予熱される。なお、タンク３１に対しては、配管を通じて燃焼用空気や燃料ガスが導入・排出される。
集光装置４を構成する反射鏡４１は、太陽を追尾するように傾角制御される。また、反射鏡４１の好ましい構成は、図３の実施形態と同様である。 FIG. 4 shows another embodiment of a preheating method such as solar combustion air and equipment according to the present invention. The light collecting device 4 includes a plurality of plate-like reflecting mirrors 41 (heliostats) and these reflections. A condensing destination of the mirror 41 is provided with a tank 31 for storing combustion air and fuel gas, and this tank 31 constitutes a preheater 3x. Sunlight is condensed on the tank 31 (preheater 3x) by the reflecting mirror 41, and the internal combustion air and fuel gas are preheated by the heat. Note that combustion air and fuel gas are introduced into and discharged from the tank 31 through piping.
The tilt angle of the reflecting mirror 41 constituting the light collecting device 4 is controlled so as to track the sun. Moreover, the preferable structure of the reflective mirror 41 is the same as that of embodiment of FIG.

図５は、本発明の炉設備の操業方法の他の実施形態を示すものである。
この実施形態では、太陽熱で熱媒体を加熱し、この熱媒体との熱交換により燃焼用空気や燃料ガスを予熱するものである。
燃焼用空気と燃料ガスをそれぞれ炉１に供給する流路２a，２bの途中に、熱媒体との熱交換で燃焼用空気と燃料ガスを予熱する予熱器３yが設けられている。この予熱器３yを通過する熱媒体の循環流路６が設けられ、その途中に加熱器７が設けられている。太陽光が集光装置４（集光板）で集光され、その熱（太陽熱）が加熱器７に供給される。循環流路６を循環する熱媒体は、加熱器７において太陽熱で加熱された後、予熱器３yにおいて熱交換により燃焼用空気と燃料ガスを予熱する。予熱された燃焼用空気と燃料ガスは炉１に送られ、燃焼のために用いられる。なお、予熱は燃焼用空気と燃料ガスのうちのいずれか一方のみを対象としてもよい。 FIG. 5 shows another embodiment of the furnace facility operating method of the present invention.
In this embodiment, the heat medium is heated by solar heat, and combustion air and fuel gas are preheated by heat exchange with the heat medium.
A preheater 3y for preheating the combustion air and the fuel gas by heat exchange with the heat medium is provided in the middle of the flow paths 2a and 2b for supplying the combustion air and the fuel gas to the furnace 1, respectively. A circulation path 6 for the heat medium passing through the preheater 3y is provided, and a heater 7 is provided in the middle thereof. Sunlight is collected by the light collecting device 4 (light collecting plate), and the heat (solar heat) is supplied to the heater 7. The heat medium circulating in the circulation channel 6 is heated by solar heat in the heater 7 and then preheats the combustion air and the fuel gas by heat exchange in the preheater 3y. Preheated combustion air and fuel gas are sent to the furnace 1 and used for combustion. Note that preheating may be performed on only one of combustion air and fuel gas.

この実施形態は、太陽熱で熱媒体を加熱し、この熱媒体との熱交換により燃焼用空気や燃料ガスを予熱するものであり、適切な熱媒体（例えば、溶融塩など）を用いれば、熱媒体は太陽熱により５００℃以上の温度に昇温されるので、燃焼用空気や燃料ガスをより高い温度に予熱することができる。
また、循環流路６の途中に断熱性がある貯留タンク８を設け、この貯留タンク８に熱媒体を蓄えておけば、太陽熱を蓄熱することができ、太陽光を集光できない時間帯でも燃焼用空気や燃料ガスの予熱が可能となる。 In this embodiment, a heat medium is heated by solar heat, and combustion air and fuel gas are preheated by heat exchange with the heat medium. If an appropriate heat medium (for example, a molten salt) is used, Since the medium is heated to a temperature of 500 ° C. or higher by solar heat, the combustion air and fuel gas can be preheated to a higher temperature.
Further, if a storage tank 8 having heat insulation is provided in the middle of the circulation flow path 6 and a heat medium is stored in the storage tank 8, solar heat can be stored, and combustion is performed even in a time zone in which sunlight cannot be collected. Preheating of working air and fuel gas becomes possible.

熱媒体としては、蓄熱などが可能な溶融塩が好ましい。溶融塩としては、例えば、炭酸塩、硝酸塩などの１種以上を用いることができる。なお、この熱媒体への蓄熱にヒートポンプ（特にケミカルヒートポンプ）を組み合わせることで、さらなる昇温や蓄熱も可能である。
図５の実施形態において、太陽熱で熱媒体を加熱するには、例えば、図３の配管３０が加熱器７を構成するようにし、太陽光が反射鏡４０により配管３０（予熱器７）に集光され、内部の熱媒体が予熱されるようにする。或いは、図４のタンク３１が加熱器７を構成するようにし、太陽光が反射鏡４１によりタンク３１（予熱器７）に集光され、内部の熱媒体が予熱されるようにする。 As the heat medium, a molten salt capable of storing heat is preferable. As a molten salt, 1 or more types, such as carbonate and nitrate, can be used, for example. In addition, further temperature increase and heat storage are possible by combining a heat pump (particularly a chemical heat pump) with heat storage in the heat medium.
In the embodiment of FIG. 5, in order to heat the heat medium with solar heat, for example, the pipe 30 of FIG. 3 constitutes the heater 7, and sunlight is collected in the pipe 30 (preheater 7) by the reflector 40. It is illuminated so that the internal heat medium is preheated. Alternatively, the tank 31 in FIG. 4 constitutes the heater 7, and sunlight is condensed on the tank 31 (preheater 7) by the reflecting mirror 41 so that the internal heat medium is preheated.

炉設備が高炉用の熱風炉である場合を想定し、従来法により図６に示すような実施形態で燃焼用空気を１５０℃に予熱した場合（燃料ガスは予熱しない）と、本発明法により図１に示すような実施形態で、燃焼用空気をそれぞれ２００℃と２５０℃に予熱した場合（燃料ガスは予熱しない）について、燃料ガス使用量と燃費向上率を求めた結果を表１に示す。なお、高炉への送風条件は、送風温度：１１４５℃、送風量：７３５０Ｎｍ３／分で一定とした。
表１によれば、従来法に対して本発明法では燃料ガス使用量が削減され、大幅な燃費向上が達成できることが判る。 Assuming that the furnace equipment is a hot blast furnace for a blast furnace, when the combustion air is preheated to 150 ° C. in the embodiment shown in FIG. 6 by the conventional method (the fuel gas is not preheated), In the embodiment shown in FIG. 1, when the combustion air is preheated to 200 ° C. and 250 ° C. (fuel gas is not preheated), the results of obtaining the fuel gas consumption and the fuel efficiency improvement rate are shown in Table 1. . The blowing conditions for the blast furnace were constant at a blowing temperature of 1145 ° C. and a blowing volume of 7350 Nm 3 / min.
According to Table 1, it can be seen that in the method of the present invention, the amount of fuel gas used is reduced compared to the conventional method, and a significant improvement in fuel consumption can be achieved.

Figure 0005696421
Figure 0005696421

１ 炉
２a，２b 流路
３x，３y 予熱器
４ 集光装置
５ 予熱器
６ 循環流路
７ 加熱器
８ 貯留タンク
３０ 配管
３１ タンク
４０，４１ 反射鏡 DESCRIPTION OF SYMBOLS 1 Furnace 2a, 2b Flow path 3x, 3y Preheater 4 Condenser 5 Preheater 6 Circulation flow path 7 Heater 8 Storage tank 30 Piping 31 Tank 40, 41 Reflector

Claims (1)

燃料ガスの燃焼熱を熱源に利用する製鉄所内の炉設備であって、高炉用の熱風炉、コークス炉、鋼材加熱用の加熱炉のいずれかの炉設備において、製鉄プロセスで発生する副生ガスを燃料ガスとして用いる際に、燃焼用空気及び燃料ガスを、集光装置で集光した太陽光の熱で直接予熱するとともに、この太陽光の熱による予熱の前又は後に、炉設備の燃焼排ガスの顕熱により予熱する炉設備の操業方法であって、
前記集光装置は太陽光を反射して集光する複数の反射鏡を備えるとともに、該複数の反射鏡の集光先には、燃焼用空気及び燃料ガスの予熱器を構成するタンクが設けられ、
該タンクには、燃焼用空気及び燃料ガスが蓄えられるとともに、配管を通じて燃焼用空気及び燃料ガスが導入・排出され、
太陽光を前記複数の反射鏡により前記タンクに集光することで、該タンク内の燃焼用空気及び燃料ガスを加熱することを特徴とする炉設備の操業方法。 The heat of combustion of the fuel gas to a furnace facility steelworks utilized as a heat source, hot air oven for a blast furnace, coke oven, either in a furnace facilities of the heating furnace of steel materials heated byproduct gas generated in steelmaking process When fuel is used as fuel gas, the combustion air and fuel gas are directly preheated with the heat of sunlight condensed by the condensing device, and before or after preheating by the sunlight heat , the combustion exhaust gas from the furnace equipment A method of operating a furnace facility preheated by sensible heat of
The condensing device includes a plurality of reflecting mirrors that reflect and collect sunlight, and a collecting point of the reflecting mirrors is provided with a tank that constitutes a preheater for combustion air and fuel gas. ,
In the tank, combustion air and fuel gas are stored, and combustion air and fuel gas are introduced and discharged through a pipe,
A method for operating a furnace facility , wherein sunlight is condensed on the tank by the plurality of reflecting mirrors to heat combustion air and fuel gas in the tank .
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