JPWO2015133161A1 - Cement firing device and denitration method for cement kiln exhaust gas - Google Patents

Cement firing device and denitration method for cement kiln exhaust gas Download PDF

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JPWO2015133161A1
JPWO2015133161A1 JP2016506155A JP2016506155A JPWO2015133161A1 JP WO2015133161 A1 JPWO2015133161 A1 JP WO2015133161A1 JP 2016506155 A JP2016506155 A JP 2016506155A JP 2016506155 A JP2016506155 A JP 2016506155A JP WO2015133161 A1 JPWO2015133161 A1 JP WO2015133161A1
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cement
kiln
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JP6476165B2 (en
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英人 鈴木
英人 鈴木
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D99/00—Subject matter not provided for in other groups of this subclass
    • F27D99/0001—Heating elements or systems
    • F27D99/0033—Heating elements or systems using burners
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B7/00—Hydraulic cements
    • C04B7/36—Manufacture of hydraulic cements in general
    • C04B7/364—Avoiding environmental pollution during cement-manufacturing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/005—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by heat treatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/54—Nitrogen compounds
    • B01D53/56—Nitrogen oxides
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B7/00—Hydraulic cements
    • C04B7/36—Manufacture of hydraulic cements in general
    • C04B7/43—Heat treatment, e.g. precalcining, burning, melting; Cooling
    • C04B7/44—Burning; Melting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
    • F27B7/20—Details, accessories, or equipment peculiar to rotary-drum furnaces
    • F27B7/34—Arrangements of heating devices

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Environmental & Geological Engineering (AREA)
  • Thermal Sciences (AREA)
  • Health & Medical Sciences (AREA)
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  • Public Health (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
  • Treating Waste Gases (AREA)
  • Furnace Details (AREA)

Abstract

【課題】仮焼炉の形式を問わず、良好な焼成状態を維持しながらセメントキルン排ガス中のＮＯｘ濃度を効率よく低減する。【解決手段】セメントキルン５の窯尻４内に燃料Ｆ３及び燃焼用空気を吹き込み、燃料を燃焼させるバーナー１４を備えるセメント焼成装置１。セメントキルン排ガス中のＮＯｘを窯尻内の低酸素領域において還元することができると共に、燃料を燃焼させることでセメント原料の脱炭酸効率も向上させることができる。バーナーは、燃料と燃焼用空気との混合流を旋回させる旋回羽根（旋回手段）１４ｂを備えることができる。セメントキルンの窯尻内への燃料供給量は、セメントキルンに付設された仮焼炉３への燃料供給量の２０％以上５０％未満とすることが好ましく、セメントキルンの窯尻内へ供給される燃料を、微粉炭、重油及び可燃性廃棄物の少なくとも一つを含むようにすることができる。【選択図】図１Regardless of the type of calcining furnace, the NOx concentration in the exhaust gas from a cement kiln is efficiently reduced while maintaining a good firing state. A cement firing apparatus 1 includes a burner 14 in which fuel F3 and combustion air are blown into a kiln bottom 4 of a cement kiln 5 to burn the fuel. The NOx in the cement kiln exhaust gas can be reduced in the low oxygen region in the kiln bottom, and the decarbonation efficiency of the cement raw material can be improved by burning the fuel. The burner can include swirl vanes (swivel means) 14b that swirls a mixed flow of fuel and combustion air. The amount of fuel supplied to the kiln bottom of the cement kiln is preferably 20% to less than 50% of the amount of fuel supplied to the calciner 3 attached to the cement kiln, and the fuel supplied to the kiln bottom of the cement kiln Can include at least one of pulverized coal, heavy oil and combustible waste. [Selection] Figure 1

Description

本発明は、セメントキルンから排出される燃焼ガス中の窒素酸化物（以下「ＮＯｘ」という。）濃度を低減する技術に関する。   The present invention relates to a technique for reducing the concentration of nitrogen oxides (hereinafter referred to as “NOx”) in combustion gas discharged from a cement kiln.

セメントキルンの排ガスには、焼成帯の高温域に起因するＮＯｘが含まれ、ＮＯｘの濃度が高い場合には、尿素やアンモニア等の脱硝剤を投入したり、仮焼炉における燃焼による還元作用によってＮＯｘ濃度を低減している。しかし、尿素を脱硝剤として利用する方法では、尿素が高価であるため運転コストが高騰する。また、尿素を添加するのみでは脱硝効率が低く、ＮＯｘと反応しなかった余剰アンモニアがそのまま系外へ排出される虞もある。   Cement kiln exhaust gas contains NOx due to the high temperature range of the calcining zone. When the concentration of NOx is high, a denitration agent such as urea or ammonia is added, or it is reduced by combustion in a calcining furnace. NOx concentration is reduced. However, in the method of using urea as a denitration agent, the operation cost increases because urea is expensive. Further, the denitration efficiency is low only by adding urea, and surplus ammonia that has not reacted with NOx may be discharged out of the system as it is.

そこで、特許文献１には、ポリアミド系樹脂及びユリア樹脂を含む廃プラスチックをセメントキルンの窯尻に投入して燃焼させ、ポリアミド系樹脂から発生したアンモニアと、ユリア樹脂から発生した尿素とが燃焼ガスに混合されることで無触媒脱硝剤として機能し、セメント焼成工程のＮＯｘ濃度を低減する方法が記載されている。   Therefore, in Patent Document 1, waste plastic containing a polyamide resin and a urea resin is put into a kiln bottom of a cement kiln and burned, and ammonia generated from the polyamide resin and urea generated from the urea resin are combustion gases. The method of functioning as a non-catalytic denitration agent by being mixed with NOx and reducing the NOx concentration in the cement firing step is described.

また、特許文献２には、仮焼炉において燃焼用二次空気の旋回流の旋回強さを調整し、還元性ガスを含む二次空気とキルン排ガスとを混合し、また、炉本体下部に残留する未燃焼分を再燃焼させるための再燃焼用空気の供給位置を適切に設定し、未燃焼分を効率よく燃焼させることでセメントキルン排ガス中の脱硝効果を向上させる方法が記載されている。   In Patent Document 2, the swirl strength of the swirling flow of the secondary air for combustion is adjusted in the calcining furnace, the secondary air containing the reducing gas and the kiln exhaust gas are mixed, A method for improving the denitration effect in the exhaust gas of cement kiln by appropriately setting the supply position of reburning air for reburning the remaining unburned portion and efficiently burning the unburned portion is described. .

日本国特許第５２０７４７４号公報Japanese Patent No. 5207474 日本国特許第３７６８０７０号公報Japanese Patent No. 3768070

しかし、特許文献１に記載の方法では、Ｏ2濃度の低い窯尻に廃プラスチックを投入することで、セメント焼成装置内の焼成状態が悪化する。さらに、特許文献２に記載の方法では、仮焼炉の形式が限定されるため、同文献に記載の仮焼炉と異なる形式の仮焼炉では脱硝効果が得られない。However, in the method described in Patent Document 1, the firing state in the cement firing device is deteriorated by putting waste plastic into the kiln bottom having a low O 2 concentration. Furthermore, in the method described in Patent Document 2, since the type of the calcining furnace is limited, a denitration effect cannot be obtained in a calcining furnace of a different type from the calcining furnace described in the same document.

そこで、本発明は、上記従来技術における問題点に鑑みてなされたものであって、仮焼炉の形式を問わず、良好な焼成状態を維持しながらセメントキルン排ガス中のＮＯｘ濃度を効率よく低減することを目的とする。   Therefore, the present invention has been made in view of the above problems in the prior art, and efficiently reduces the NOx concentration in the cement kiln exhaust gas while maintaining a good firing state regardless of the type of the calciner. The purpose is to do.

上記目的を達成するため、本発明のセメント焼成装置は、セメントキルンの窯尻内に燃料及び燃焼用空気を吹き込み、該燃料を燃焼させるバーナーを備えることを特徴とする。   In order to achieve the above object, a cement baking apparatus of the present invention is characterized by including a burner for blowing fuel and combustion air into a kiln bottom of a cement kiln and burning the fuel.

本発明に係るセメント焼成装置によれば、前記バーナーを設けたことで、セメントキルン排ガス中のＮＯｘを窯尻内の低酸素領域において還元することができると共に、燃料を燃焼させることでセメント原料の脱炭酸効率も向上させることができ、仮焼炉の形式を問わず、良好な焼成状態を維持しながらセメントキルン排ガス中のＮＯｘ濃度を効率よく低減することができる。   According to the cement firing apparatus of the present invention, by providing the burner, NOx in the cement kiln exhaust gas can be reduced in a low oxygen region in the kiln bottom, and the cement raw material is removed by burning the fuel. Carbonation efficiency can also be improved, and the NOx concentration in the cement kiln exhaust gas can be efficiently reduced while maintaining a good firing state regardless of the type of calcining furnace.

上記セメント焼成装置において、前記バーナーは、前記燃料と前記燃焼用空気との混合流を旋回させる旋回手段を備えることができる。これにより燃料の燃焼効率が向上し、脱炭酸効率をさらに向上させることができる。   In the cement baking apparatus, the burner may include a turning means for turning a mixed flow of the fuel and the combustion air. Thereby, the combustion efficiency of the fuel is improved, and the decarboxylation efficiency can be further improved.

また、本発明は、セメントキルン排ガスの脱硝方法であって、セメントキルンの窯尻内に燃料及び燃焼用空気を吹き込み、該燃料を燃焼させることを特徴とする。本発明によれば、セメントキルン排ガス中のＮＯｘを窯尻内の低酸素領域において還元すると共に、セメント原料の脱炭酸効率も向上させ、仮焼炉の形式を問わず、良好な焼成状態を維持しながらセメントキルン排ガス中のＮＯｘ濃度を効率よく低減することができる。   The present invention also relates to a denitration method for cement kiln exhaust gas, which is characterized in that fuel and combustion air are blown into a kiln bottom of the cement kiln and the fuel is burned. According to the present invention, NOx in the exhaust gas from the cement kiln is reduced in the low oxygen region in the kiln bottom, and the decarbonation efficiency of the cement raw material is improved, and a good firing state is maintained regardless of the type of the calcining furnace. However, the NOx concentration in the cement kiln exhaust gas can be efficiently reduced.

上記セメントキルン排ガスの脱硝方法において、前記セメントキルンの窯尻内への燃料供給量を前記セメントキルンに付設された仮焼炉への燃料供給量の２０％以上５０％未満とすることができ、燃料として微粉炭、重油及び可燃性廃棄物の少なくとも一つを含むことができる。   In the denitration method for cement kiln exhaust gas, the amount of fuel supplied into the kiln bottom of the cement kiln can be 20% or more and less than 50% of the amount of fuel supplied to the calciner attached to the cement kiln. As at least one of pulverized coal, heavy oil and combustible waste.

以上のように、本発明によれば、仮焼炉の形式を問わず、良好な焼成状態を維持しながらセメントキルン排ガス中のＮＯｘ濃度を効率よく低減することができる。   As described above, according to the present invention, the NOx concentration in the cement kiln exhaust gas can be efficiently reduced while maintaining a good firing state regardless of the type of the calcining furnace.

本発明に係るセメントキルン焼成装置の一実施の形態を示す概略図である。It is the schematic which shows one Embodiment of the cement kiln baking apparatus which concerns on this invention. 図１のバーナーを示す図であって、（ａ）は断面図、（ｂ）は側面図、（ｃ）はバーナー先端部の展開図である。It is a figure which shows the burner of FIG. 1, Comprising: (a) is sectional drawing, (b) is a side view, (c) is an expanded view of a burner front-end | tip part.

図１は、本発明に係るセメント焼成装置の一実施の形態を示し、このセメント焼成装置１は、セメント原料（以下「原料」という。）Ｒを予熱するプレヒータ２と、プレヒータ２の上から３段目のサイクロン２ｂからの原料Ｒ１を仮焼炉バーナー１３から吹き込まれた燃料Ｆ２によって仮焼する仮焼炉３と、プレヒータ２の最下段サイクロン２ａからの原料Ｒ２を主バーナー１５から吹き込まれた燃料Ｆ１によって焼成するセメントキルン５と、セメントキルン５で焼成されたセメントクリンカを冷却するクリンカクーラ６と、セメントキルン５の窯尻４に設置された脱硝用バーナー１４等で構成される。尚、脱硝用バーナー１４を除く、プレヒータ２、仮焼炉３、セメントキルン５及びクリンカクーラ６等の構成は、従来のものと同様である。   FIG. 1 shows an embodiment of a cement firing apparatus according to the present invention. This cement firing apparatus 1 includes a preheater 2 for preheating a cement raw material (hereinafter referred to as “raw material”) R, and a top heater 3. The calcining furnace 3 for calcining the raw material R1 from the second cyclone 2b with the fuel F2 blown from the calcining furnace burner 13, and the raw material R2 from the lowermost cyclone 2a of the preheater 2 were blown from the main burner 15. The cement kiln 5 fired by the fuel F1, the clinker cooler 6 for cooling the cement clinker fired by the cement kiln 5, the denitration burner 14 installed at the kiln bottom 4 of the cement kiln 5, and the like. The configuration of the preheater 2, the calcining furnace 3, the cement kiln 5, the clinker cooler 6 and the like excluding the denitration burner 14 is the same as that of the conventional one.

脱硝用バーナー１４は、図２に示すように、筒状の本体１４ａの先端部に旋回羽根（旋回手段）１４ｂを旋回角度１０〜５０度で６〜１０枚固定した円筒状部材１４ｈと、円筒状部材１４ｈの中心部に位置する棒状部材１４ｊと、円筒状部材１４ｈの先端外側に位置するリング状部材１４ｆとを備える。この脱硝用バーナー１４は、先端部側が耐火物１４ｅで覆われ、本体１４ａの後端側の取付用部材１４ｃと窯尻４の表面４ａとがブラケット１４ｄによって結合されて窯尻４に装着される。窯尻４も耐火物４ｂで保護される。尚、旋回角度とは、図２（ｃ）に示すように、円筒状部材１４ｈを平面状に展開した場合に、脱硝用バーナー１４の軸線方向１４ｍと、旋回羽根１４ｂの中心線１４ｇとのなす角θであり、流路の先端１４ｋにおける固体粉末燃料流Ｆの旋回角度に一致する。上記旋回羽根１４ｂの枚数及び旋回角度は適宜変更することができる。   As shown in FIG. 2, the denitration burner 14 includes a cylindrical member 14 h in which 6 to 10 swirling blades (turning means) 14 b are fixed at a swivel angle of 10 to 50 degrees at the tip of a cylindrical main body 14 a, and a cylindrical member The rod-shaped member 14j located in the center part of 14-shaped member 14h, and the ring-shaped member 14f located in the front-end | tip outer side of the cylindrical member 14h are provided. The denitration burner 14 is covered with a refractory 14e on the tip side, and the mounting member 14c on the rear end side of the main body 14a and the surface 4a of the kiln butt 4 are coupled by a bracket 14d and attached to the kiln butt 4. . The kiln bottom 4 is also protected by the refractory 4b. As shown in FIG. 2 (c), the turning angle is defined by the axial direction 14m of the denitration burner 14 and the center line 14g of the turning blade 14b when the cylindrical member 14h is expanded in a plane. The angle θ corresponds to the turning angle of the solid powder fuel flow F at the tip 14k of the flow path. The number of swirl blades 14b and the swivel angle can be changed as appropriate.

次に、本発明に係るセメントキルン排ガスの脱硝方法について図１及び図２を参照しながら説明する。   Next, a denitration method for cement kiln exhaust gas according to the present invention will be described with reference to FIGS.

セメント焼成装置１のプレヒータ２でセメントキルン５からの排ガスＧを用いて原料Ｒの予熱を行い、仮焼炉３でプレヒータ２のサイクロン２ｂからの原料Ｒ１を仮焼する。この際、仮焼炉バーナー１３から燃料Ｆ２と共に、クリンカクーラ６からの３次空気Ｇ１を吹き込んで燃料Ｆ２を燃焼させる。燃料Ｆ２には、微粉炭、重油等が用いられ、可燃性廃棄物を燃料Ｆ２の一部又は全部に用いてもよい。   The raw material R is preheated using the exhaust gas G from the cement kiln 5 in the preheater 2 of the cement baking apparatus 1, and the raw material R1 from the cyclone 2 b of the preheater 2 is calcined in the calcining furnace 3. At this time, the fuel F2 is burned by blowing the tertiary air G1 from the clinker cooler 6 together with the fuel F2 from the calciner burner 13. As the fuel F2, pulverized coal, heavy oil, or the like may be used, and flammable waste may be used for a part or all of the fuel F2.

セメントキルン５の窯尻４に設置された脱硝用バーナー１４からも燃料Ｆ３を燃焼用空気と共に吹き込み、燃料Ｆ３を燃焼させる。燃料Ｆ３には、仮焼炉３用の燃料Ｆ２と同様、微粉炭、重油、可燃性廃棄物を用いることができ、これらのいずれか一つ又は複数を同時に用いてもよい。   Fuel F3 is also blown together with combustion air from a denitration burner 14 installed in the kiln bottom 4 of the cement kiln 5 to burn the fuel F3. Like the fuel F2 for the calcining furnace 3, pulverized coal, heavy oil, and combustible waste can be used for the fuel F3, and any one or more of these may be used simultaneously.

脱硝用バーナー１４から燃料Ｆ３を吹き込むことで、セメントキルン５の燃焼ガスＧに含まれるＮＯｘを窯尻内の低酸素領域において還元することができる。また、燃料Ｆ３を燃焼用空気を用いて燃焼させることで、原料Ｒ２、Ｒ３の脱炭酸を行うこともでき、セメント焼成装置１全体の脱炭酸効率を向上させることもできる。この際、脱硝用バーナー１４に設けた旋回羽根１４ｂにより燃料Ｆ３と燃焼用空気との混合流を旋回させて窯尻４の内部に吹き込むため、燃料Ｆ３の燃焼効率が向上する。   By blowing the fuel F3 from the denitration burner 14, NOx contained in the combustion gas G of the cement kiln 5 can be reduced in a low oxygen region in the kiln bottom. Moreover, by burning the fuel F3 using combustion air, the raw materials R2 and R3 can be decarboxylated, and the decarboxylation efficiency of the cement baking apparatus 1 as a whole can be improved. At this time, since the mixed flow of the fuel F3 and the combustion air is swirled by the swirl vane 14b provided in the denitration burner 14 and blown into the kiln bottom 4, the combustion efficiency of the fuel F3 is improved.

上記仮焼炉３用の燃料Ｆ２と脱硝用バーナー１４から吹き込む燃料Ｆ３の割合を２０％以上５０％未満に調整することが好ましい。燃料Ｆ３の割合が２０％を下回ると脱硝効果が低下し、燃料Ｆ３の割合が５０％を超えると、仮焼炉３での原料Ｒ３の脱炭酸効率が低下して好ましくない。   The ratio of the fuel F2 for the calciner 3 and the fuel F3 blown from the denitration burner 14 is preferably adjusted to 20% or more and less than 50%. When the ratio of the fuel F3 is less than 20%, the denitration effect is lowered, and when the ratio of the fuel F3 is more than 50%, the decarboxylation efficiency of the raw material R3 in the calciner 3 is not preferable.

次に、セメントキルン５の主バーナー１５から微粉炭等の燃料Ｆ１を吹き込んで、プレヒータ２のサイクロン２ａからの原料Ｒ２を焼成し、得られたクリンカをクリンカクーラ６で冷却してセメントクリンカＣＬを得る。   Next, a fuel F1 such as pulverized coal is blown from the main burner 15 of the cement kiln 5, the raw material R2 from the cyclone 2a of the preheater 2 is fired, and the resulting clinker is cooled by the clinker cooler 6 to remove the cement clinker CL. obtain.

次に、上記構成を有するセメント焼成装置を用いた、セメントキルン排ガスの脱硝方法の試験例について説明する。   Next, a test example of a denitration method for cement kiln exhaust gas using the cement baking apparatus having the above configuration will be described.

３つのセメント工場において、上記脱硝用バーナー１４を用いた場合（実施例）と、用いなかった場合（比較例）とで、最下段サイクロンの出口ガス、及びセメントキルン排ガスを大気に放出する煙突の排ガスのＮＯｘ濃度を比較した結果を表１に示す。   In three cement factories, when the denitration burner 14 is used (Example) and when it is not used (Comparative Example), the exit gas of the lowest cyclone and the chimney that releases the cement kiln exhaust gas to the atmosphere Table 1 shows the result of comparing the NOx concentration of the exhaust gas.

Figure 2015133161
Figure 2015133161

同表より、脱硝用バーナー１４を用いることで、各々の評価位置でのＮＯｘ濃度が低下していることが判る。また、詳細データは省略するが、上記各実施例においては、比較例と同様、セメントキルン等において良好な焼成状態が維持されている。   From the table, it can be seen that the NOx concentration at each evaluation position is reduced by using the denitration burner 14. Further, although detailed data is omitted, in each of the above examples, a good firing state is maintained in a cement kiln or the like as in the comparative example.

尚、上記実施の形態においては、脱硝用バーナー１４の本体１４ａの先端部に旋回羽根１４ｂを設けたが、この旋回羽根１４ｂは必ずしも設置する必要はなく、燃焼用空気を旋回させずに燃料Ｆ３と共に窯尻４に吹き込むこともできる。   In the above-described embodiment, the swirl vane 14b is provided at the tip of the main body 14a of the denitration burner 14, but the swirl vane 14b is not necessarily installed, and the fuel F3 does not swirl the combustion air. At the same time, it can be blown into the kiln bottom 4.

１ セメント焼成装置
２ プレヒータ
２ａ 最下段サイクロン
２ｂ 上から３段目のサイクロン
３ 仮焼炉
４ 窯尻
４ａ 表面
４ｂ 耐火物
５ セメントキルン
６ クリンカクーラ
１３ 仮焼炉バーナー
１４ 脱硝用バーナー
１４ａ 本体
１４ｂ 旋回羽根
１４ｃ 取付用部材
１４ｄ ブラケット
１４ｅ 耐火物
１４ｆ リング状部材
１４ｇ 中心線
１４ｈ 円筒状部材
１４ｊ 棒状部材
１４ｋ 流路の先端
１４ｍ 軸線方向
１５ 主バーナーDESCRIPTION OF SYMBOLS 1 Cement baking apparatus 2 Preheater 2a Bottom-stage cyclone 2b Cyclone of the 3rd stage from the top 3 Calciner 4 Kiln bottom 4a Surface 4b Refractory 5 Cement kiln 6 Clinker cooler 13 Calciner burner 14 Denitration burner 14a Main body 14b Swivel blade 14c Mounting member 14d Bracket 14e Refractory 14f Ring member 14g Center line 14h Cylindrical member 14j Rod member 14k Flow path tip 14m Axial direction 15 Main burner

【０００２】
発明の概要
発明が解決しようとする課題
［０００６］
しかし、特許文献１に記載の方法では、Ｏ２濃度の低い窯尻に廃プラスチックを投入することで、セメント焼成装置内の焼成状態が悪化する。さらに、特許文献２に記載の方法では、仮焼炉の形式が限定されるため、同文献に記載の仮焼炉と異なる形式の仮焼炉では脱硝効果が得られない。
［０００７］
そこで、本発明は、上記従来技術における問題点に鑑みてなされたものであって、仮焼炉の形式を問わず、良好な焼成状態を維持しながらセメントキルン排ガス中のＮＯｘ濃度を効率よく低減することを目的とする。
課題を解決するための手段
［０００８］
上記目的を達成するため、本発明のセメント焼成装置は、セメントキルンの窯尻内に燃料及び燃焼用空気を吹き込み、該燃料を燃焼させる脱硝用バーナーを備えることを特徴とする。
［０００９］
本発明に係るセメント焼成装置によれば、前記バーナーを設けたことで、セメントキルン排ガス中のＮＯｘを窯尻内の低酸素領域において還元することができると共に、燃料を燃焼させることでセメント原料の脱炭酸効率も向上させることができ、仮焼炉の形式を問わず、良好な焼成状態を維持しながらセメントキルン排ガス中のＮＯｘ濃度を効率よく低減することができる。
［００１０］
上記セメント焼成装置において、前記バーナーは、前記燃料と前記燃焼用空気との混合流を旋回させる旋回手段を備えることができる。これにより燃料の燃焼効率が向上し、脱炭酸効率をさらに向上させることができる。
［００１１］
また、本発明は、セメントキルン排ガスの脱硝方法であって、セメントキルンの窯尻内に脱硝用バーナーから燃料及び燃焼用空気を吹き込み、該燃料を燃焼させることを特徴とする。本発明によれば、セメントキルン排ガス中のＮＯｘを窯尻内の低酸素領域において還元すると共に、セメント原料の脱炭酸効率も向上させ、仮焼炉の形式を問わず、良好な焼成状態を維持しながらセメントキルン排ガス中のＮＯｘ濃度を効率よく低減することができる。
［００１２］
上記セメントキルン排ガスの脱硝方法において、前記セメントキルンの窯[0002]
SUMMARY OF THE INVENTION Problems to be Solved by the Invention [0006]
However, in the method described in Patent Document 1, the firing state in the cement firing device is deteriorated by introducing waste plastic into the kiln bottom having a low O 2 concentration. Furthermore, in the method described in Patent Document 2, since the type of the calcining furnace is limited, a denitration effect cannot be obtained in a calcining furnace of a different type from the calcining furnace described in the same document.
[0007]
Therefore, the present invention has been made in view of the above problems in the prior art, and efficiently reduces the NOx concentration in the cement kiln exhaust gas while maintaining a good firing state regardless of the type of the calciner. The purpose is to do.
Means for Solving the Problems [0008]
In order to achieve the above object, a cement firing apparatus of the present invention is characterized by including a denitration burner that blows fuel and combustion air into a kiln bottom of a cement kiln and burns the fuel.
[0009]
According to the cement firing apparatus of the present invention, by providing the burner, NOx in the cement kiln exhaust gas can be reduced in a low oxygen region in the kiln bottom, and the cement raw material is removed by burning the fuel. Carbonation efficiency can also be improved, and the NOx concentration in the cement kiln exhaust gas can be efficiently reduced while maintaining a good firing state regardless of the type of calcining furnace.
[0010]
In the cement baking apparatus, the burner may include a turning means for turning a mixed flow of the fuel and the combustion air. Thereby, the combustion efficiency of the fuel is improved, and the decarboxylation efficiency can be further improved.
[0011]
The present invention also relates to a denitration method for cement kiln exhaust gas, which is characterized in that fuel and combustion air are blown from a denitration burner into the bottom of the kiln of the cement kiln, and the fuel is burned. According to the present invention, NOx in the exhaust gas from the cement kiln is reduced in the low oxygen region in the kiln bottom, and the decarbonation efficiency of the cement raw material is improved, and a good firing state is maintained regardless of the type of the calcining furnace. However, the NOx concentration in the cement kiln exhaust gas can be efficiently reduced.
[0012]
In the above-described cement kiln exhaust gas denitration method, the cement kiln kiln

Claims (5)

セメントキルンの窯尻内に燃料及び燃焼用空気を吹き込み、該燃料を燃焼させるバーナーを備えることを特徴とするセメント焼成装置。   A cement baking apparatus comprising a burner for blowing fuel and combustion air into a kiln bottom of a cement kiln and burning the fuel. 前記バーナーは、前記燃料と前記燃焼用空気との混合流を旋回させる旋回手段を備えることを特徴とする請求項１に記載のセメント焼成装置。   The cement burner according to claim 1, wherein the burner includes swirling means for swirling a mixed flow of the fuel and the combustion air. セメントキルンの窯尻内に燃料及び燃焼用空気を吹き込み、該燃料を燃焼させることを特徴とするセメントキルン排ガスの脱硝方法。   A denitration method for exhaust gas from a cement kiln characterized by blowing fuel and combustion air into a kiln bottom of a cement kiln and burning the fuel. 前記セメントキルンの窯尻内への燃料供給量は、前記セメントキルンに付設された仮焼炉への燃料供給量の２０％以上５０％未満であることを特徴とする請求項３に記載のセメントキルン排ガスの脱硝方法。   The cement kiln according to claim 3, wherein the amount of fuel supplied into the kiln bottom of the cement kiln is 20% or more and less than 50% of the amount of fuel supplied to the calciner attached to the cement kiln. Denitration method for exhaust gas. 前記セメントキルンの窯尻内へ供給される燃料は、微粉炭、重油及び可燃性廃棄物の少なくとも一つを含むことを特徴とする請求項３又は４に記載のセメントキルン排ガスの脱硝方法。   The denitration method for cement kiln exhaust gas according to claim 3 or 4, wherein the fuel supplied into the kiln bottom of the cement kiln includes at least one of pulverized coal, heavy oil, and combustible waste.
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