WO2021019753A1 - Cement firing device and cement kiln exhaust gas denitrification method - Google Patents
Cement firing device and cement kiln exhaust gas denitrification method Download PDFInfo
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- WO2021019753A1 WO2021019753A1 PCT/JP2019/030139 JP2019030139W WO2021019753A1 WO 2021019753 A1 WO2021019753 A1 WO 2021019753A1 JP 2019030139 W JP2019030139 W JP 2019030139W WO 2021019753 A1 WO2021019753 A1 WO 2021019753A1
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- 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
- C04B7/436—Special arrangements for treating part or all of the cement kiln dust
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- 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
-
- 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
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/76—Gas phase processes, e.g. by using aerosols
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- 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
-
- 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
-
- 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
-
- 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
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
- Y02P40/125—Fuels from renewable energy sources, e.g. waste or biomass
Definitions
- the present invention relates to a technique for reducing the concentration of nitrogen oxides (hereinafter referred to as "NOx”) in the combustion gas discharged from a cement kiln.
- NOx nitrogen oxides
- the exhaust gas of cement kiln contains NOx caused by the high temperature region of the firing zone, and when the concentration of NOx is high, a denitration agent such as urea or ammonia is added, or due to the reducing action by combustion in the calcining furnace.
- a denitration agent such as urea or ammonia
- the NOx concentration is reduced.
- the operating cost rises because urea is expensive.
- the denitration efficiency is low only by adding urea, and excess ammonia that has not reacted with NOx may be discharged to the outside of the system as it is.
- the applicant provided a denitration burner that blows fuel and combustion air into the kiln butt of the cement kiln, reduces NOx in the cement kiln exhaust gas in the low oxygen region in the kiln butt, and burns the fuel.
- the decarbonation efficiency of the cement raw material can also be improved, and a technique for efficiently reducing the NOx concentration in the cement kiln exhaust gas while maintaining a good firing state has been proposed regardless of the type of the calcining furnace (Patent Document 1). reference).
- the present invention has been made in view of the above-mentioned problems in the prior art, and an object of the present invention is to further reduce the NOx concentration in the cement kiln exhaust gas.
- a plurality of cement firing devices of the present invention are provided in the kiln butt of the cement kiln, and 50% of the fuel to be burned in the kiln butt in the calcining furnace attached to the cement kiln as a whole. It is characterized by including a denitration burner that blows 100% or less of fuel and combustion air.
- the cement firing apparatus by increasing the amount of fuel blown into the kiln butt, the amount of reducing agent generated from the fuel and the raw material increases, and O 2 is consumed, so that the effect of the kiln butt O 2 is affected. Since it is hardly received, the NOx concentration in the cement kiln exhaust gas can be further reduced.
- the amount of blown fuel per denitration burner can be reduced to prevent adhesion of coaching and collision between fuels, as well as mixing of the blown fuel with the kiln exhaust gas flowing through the kiln. The probability of collision with NOx in the kiln exhaust gas can be increased.
- the probability of collision between the reducing agent generated from the fuel blown from the denitration burners and NOx in the cement kiln exhaust gas can be further increased.
- the present invention is a method for denitration of exhaust gas from a cement kiln, which is attached to the cement kiln from a plurality of denitration burners installed at the kiln butt of the cement kiln into the kiln butt and the entire plurality of denitration burners. It is characterized in that 50% or more and 100% or less of the fuel to be burned in the calcining furnace and a small amount of pumping air are blown into the fuel to partially burn the fuel in a low oxygen concentration atmosphere.
- the present invention since the amount of the reducing agent is increased and O 2 is consumed, the influence of the kiln tail O 2 is hardly affected, so that the NOx concentration in the cement kiln exhaust gas can be further reduced.
- the amount of blown fuel per denitration burner adhesion of coaching and collision between fuels are prevented, and the blown fuel is mixed with the kiln exhaust gas flowing through the kiln tail and collides with NOx in the kiln exhaust gas. You can increase the probability.
- Fe in the raw material 2 It can be used as a reducing agent for reducing O 3 and denitrifying NOx.
- the NOx concentration in the cement kiln exhaust gas can be further reduced.
- the cement firing device 1 includes a preheater 2 for preheating a cement raw material (hereinafter referred to as “raw material”) R, and a preheater 2.
- raw material R1 from the third-stage cyclone 2b from the top is calcined by the fuel F2 blown from the calciner burner 13, and the raw material R2 from the bottom cyclone 2a of the preheater 2 is from the main burner 15.
- a cement kiln 5 fired by the blown fuel F1 a clink cooler 6 that cools the cement clinker fired by the cement kiln 5, and four denitration burners 14 (14A) installed in the kiln bottom 4 of the cement kiln 5.
- the configurations of the preheater 2, the calciner 3, the cement kiln 5, the clinker cooler 6, and the like, excluding the denitration burner 14, are the same as those of the conventional one.
- the denitration burners 14 (14A to 14D) are arranged on the same horizontal plane as the kiln tail 4. Further, it is preferable that 6 to 10 swivel blades are provided at the tip of each denitration burner 14 at a swivel angle of 10 to 50 degrees, as in the cement firing apparatus described in Patent Document 1.
- the preheater 2 of the cement firing apparatus 1 preheats the raw material R using the exhaust gas G from the cement kiln 5, and the calcining furnace 3 calcins the raw material R1 from the cyclone 2b of the preheater 2.
- the tertiary air G1 from the clinker cooler 6 is blown from the calciner burner 13 together with the fuel F2 to burn the fuel F2.
- the fuel F2 pulverized coal, heavy oil, or the like is used, and combustible waste may be used for a part or all of the fuel F2.
- Fuel F3 is also blown from four denitration burners 14 (14A to 14D) installed in the kiln butt 4 of the cement kiln 5 together with a small amount of pumping air to convert the fuel F3 into partial combustion gas.
- the amount of fuel F3 blown from the four denitration burners 14 is 50% or more and 100% or less of the total amount of the fuel F2 for the calciner 3 in the total of the four denitration burners 14.
- pulverized coal, heavy oil, and combustible waste can be used as in the fuel F2 for the calcining furnace 3, and any one or a plurality of these may be used at the same time.
- the amount of reducing agent is increased and the amount of the kiln tail O 2 is increased. Since it is hardly affected, the reducing effect does not decrease when the kiln tail O 2 concentration is high as in the conventional case, and the NOx concentration in the cement kiln exhaust gas can be effectively reduced.
- the fuel blown from the denitration burner 14 immediately moves upward, so that NOx is reduced only in the upper part of the portion where the denitration burner 14 is installed. NOx on the side opposite to the denitration burner 14 is difficult to be reduced, and the effect of reducing NOx is small. Therefore, in the present invention, by providing four denitration burners 14, the amount of blown air per denitration burner 14 is reduced to prevent adhesion of coaching and collision between fuels, and the kiln exhaust gas flowing through the kiln tail. It is possible to increase the probability of collision with NOx in the mixture and kiln exhaust gas.
- the denitration burner 14 by installing the denitration burner 14 on the same horizontal plane, the probability of collision with NOx in the kiln exhaust gas can be further increased, which is preferable.
- 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 obtained clinker is cooled by the clinker cooler 6 to obtain the cement clinker CL. obtain.
- denitration burners 14 are installed, but the number of denitration burners 14 is not limited to four, and the above effect can be obtained by installing a plurality of burners 14. When five or more denitration burners 14 are installed, they may be arranged in two stages in the vertical direction instead of on the same horizontal plane.
- cement firing device 1 is of the SF type
- present invention can be applied to other types of cement firing devices.
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Abstract
[Problem] To reduce the NOx concentration in cement kiln exhaust gas. [Solution] A cement firing device 1 is equipped with a plurality of denitrification burners 14 (14A to 14D) which are provided at the kiln inlet 4 of a cement kiln 5 and inject, into the kiln inlet, combustion air and a fuel F3 in an overall amount of between 50% and 100% of the fuel F2 being burned in a precalcination oven 3 installed on the cement kiln. Increasing the fuel injected into the kiln inlet increases the amount of reducing agent, while causing the influence from the kiln inlet O2 to be mostly lost, allowing the NOx concentration in the kiln exhaust gas to be reduced further. The provision of a plurality of denitrification burners allows for a reduction in the injection amount per denitrification burner, the prevention of coating adhesion and fuel-to-fuel collision, and a higher probability of the injected fuel mixing with the kiln exhaust gas flowing in the kiln inlet and colliding with the NOx in the kiln exhaust gas. Providing the plurality of denitrification burners in the same horizontal plane further increases the probability of colliding with the NOx in the kiln exhaust gas.
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 the 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。
The exhaust gas of cement kiln contains NOx caused by the high temperature region of the firing zone, and when the concentration of NOx is high, a denitration agent such as urea or ammonia is added, or due to the reducing action by combustion in the calcining furnace. The NOx concentration is reduced. However, in the method using urea as a denitration agent, the operating cost rises because urea is expensive. In addition, the denitration efficiency is low only by adding urea, and excess ammonia that has not reacted with NOx may be discharged to the outside of the system as it is.
そこで、本出願人は、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む脱硝用バーナーを設け、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、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技術を提案した（特許文献１参照）。
Therefore, the applicant provided a denitration burner that blows fuel and combustion air into the kiln butt of the cement kiln, reduces NOx in the cement kiln exhaust gas in the low oxygen region in the kiln butt, and burns the fuel. The decarbonation efficiency of the cement raw material can also be improved, and a technique for efficiently reducing the NOx concentration in the cement kiln exhaust gas while maintaining a good firing state has been proposed regardless of the type of the calcining furnace (Patent Document 1). reference).
上記特許文献１に記載の方法に基づき、従来、脱硝用バーナー１本を窯尻に設置し、仮焼炉燃料の２５～３０％を脱硝用バーナーから吹き込み、セメントキルン排ガス中のＮＯｘを還元し、ＮＯｘ濃度を低減していたが、７０～１００ｐｐｍ（Ｏ2＝１０％）までの低減量しか得られず、昨今のＮＯｘ排出量の規制強化によりさらにＮＯｘ濃度を低減する必要性が生じていた。
Based on the method described in Patent Document 1, conventionally, one denitration burner is installed in the kiln butt, 25 to 30% of the calciner fuel is blown from the denitration burner, and NOx in the cement kiln exhaust gas is reduced. Although the NOx concentration was reduced, only a reduction amount of 70 to 100 ppm (O 2 = 10%) was obtained, and it became necessary to further reduce the NOx concentration due to the recent tightening of regulations on NOx emissions. ..
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、セメントキルン排ガス中のＮＯｘ濃度をさらに低減することを目的とする。
Therefore, the present invention has been made in view of the above-mentioned problems in the prior art, and an object of the present invention is to further reduce the NOx concentration in the cement kiln exhaust gas.
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に複数設けられ、該窯尻内に、全体で、該セメントキルンに付設された仮焼炉で燃焼させる燃料の５０％以上１００％以下の量の燃料及び燃焼用空気を吹き込む脱硝用バーナーを備えることを特徴とする。
In order to achieve the above object, a plurality of cement firing devices of the present invention are provided in the kiln butt of the cement kiln, and 50% of the fuel to be burned in the kiln butt in the calcining furnace attached to the cement kiln as a whole. It is characterized by including a denitration burner that blows 100% or less of fuel and combustion air.
本発明に係るセメント焼成装置によれば、窯尻に吹き込む燃料を増加させることで、燃料及び原料から発生する還元剤量が多くなると共に、Ｏ2を消費することから窯尻Ｏ2の影響をほとんど受けなくなるため、セメントキルン排ガス中のＮＯｘ濃度をさらに低減することができる。また、脱硝用バーナーを複数設けることで、脱硝用バーナー１本当たりの吹き込み量を減らし、コーチングの付着や燃料同士の衝突を防ぐと共に、吹き込まれた燃料と窯尻を流れるキルン排ガスとの混合及びキルン排ガス中のＮＯｘとの衝突確率を上げることができる。
According to the cement firing apparatus according to the present invention, by increasing the amount of fuel blown into the kiln butt, the amount of reducing agent generated from the fuel and the raw material increases, and O 2 is consumed, so that the effect of the kiln butt O 2 is affected. Since it is hardly received, the NOx concentration in the cement kiln exhaust gas can be further reduced. In addition, by providing multiple denitration burners, the amount of blown fuel per denitration burner can be reduced to prevent adhesion of coaching and collision between fuels, as well as mixing of the blown fuel with the kiln exhaust gas flowing through the kiln. The probability of collision with NOx in the kiln exhaust gas can be increased.
前記複数の脱硝用バーナーを同一水平面上に設置することで、脱硝用バーナーから吹き込まれた燃料から発生する還元剤とセメントキルン排ガス中のＮＯｘとの衝突確率をさらに上昇させることができる。
By installing the plurality of denitration burners on the same horizontal plane, the probability of collision between the reducing agent generated from the fuel blown from the denitration burners and NOx in the cement kiln exhaust gas can be further increased.
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に複数設置される脱硝用バーナーから該窯尻内に、該複数の脱硝用バーナー全体で、該セメントキルンに付設された仮焼炉で燃焼させる燃料の５０％以上１００％以下の量の燃料及び少量の圧送用空気を吹き込み、該燃料を低酸素濃度雰囲気下で部分燃焼ガス化させることを特徴とする。本発明によれば、還元剤量が多くなり、Ｏ2を消費することから窯尻Ｏ2の影響をほとんど受けなくなるため、セメントキルン排ガス中のＮＯｘ濃度をさらに低減することができる。また、脱硝用バーナー１本当たりの吹き込み量を減らすことでコーチングの付着や燃料同士の衝突を防ぐと共に、吹き込まれた燃料と窯尻を流れるキルン排ガスとの混合及びキルン排ガス中のＮＯｘとの衝突確率を上げることができる。
Further, the present invention is a method for denitration of exhaust gas from a cement kiln, which is attached to the cement kiln from a plurality of denitration burners installed at the kiln butt of the cement kiln into the kiln butt and the entire plurality of denitration burners. It is characterized in that 50% or more and 100% or less of the fuel to be burned in the calcining furnace and a small amount of pumping air are blown into the fuel to partially burn the fuel in a low oxygen concentration atmosphere. According to the present invention, since the amount of the reducing agent is increased and O 2 is consumed, the influence of the kiln tail O 2 is hardly affected, so that the NOx concentration in the cement kiln exhaust gas can be further reduced. In addition, by reducing the amount of blown fuel per denitration burner, adhesion of coaching and collision between fuels are prevented, and the blown fuel is mixed with the kiln exhaust gas flowing through the kiln tail and collides with NOx in the kiln exhaust gas. You can increase the probability.
また、該セメントキルンに付設されたサイクロンから排出された原料の一部を分取し、前記脱硝用バーナーの設置部位の上方１０００ｍｍから下方１０００ｍｍまでの間に送入することで、原料中のＦｅ2Ｏ3を還元してＮＯｘを脱硝するための還元剤として利用することができる。
Further, by separating a part of the raw material discharged from the cyclone attached to the cement kiln and feeding it between 1000 mm above and 1000 mm below the installation site of the denitration burner, Fe in the raw material 2 It can be used as a reducing agent for reducing O 3 and denitrifying NOx.
以上のように、本発明によれば、セメントキルン排ガス中のＮＯｘ濃度をさらに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 further reduced.
図１及び図２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４本の脱硝用バーナー１４（１４Ａ～１４Ｄ）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。
1 and 2 show an embodiment of a cement firing device according to the present invention, wherein the cement firing device 1 includes a preheater 2 for preheating a cement raw material (hereinafter referred to as “raw material”) R, and a preheater 2. The raw material R1 from the third-stage cyclone 2b from the top is calcined by the fuel F2 blown from the calciner burner 13, and the raw material R2 from the bottom cyclone 2a of the preheater 2 is from the main burner 15. A cement kiln 5 fired by the blown fuel F1, a clink cooler 6 that cools the cement clinker fired by the cement kiln 5, and four denitration burners 14 (14A) installed in the kiln bottom 4 of the cement kiln 5. ~ 14D) and the like. The configurations of the preheater 2, the calciner 3, the cement kiln 5, the clinker cooler 6, and the like, excluding the denitration burner 14, are the same as those of the conventional one.
脱硝用バーナー１４（１４Ａ～１４Ｄ）は、図２に示すように、窯尻４に同一水平面上に配置される。また、各々の脱硝用バーナー１４の先端部には、特許文献１に記載のセメント焼成装置と同様に、旋回角度１０～５０度で６～１０枚の旋回羽根を設けることが好ましい。
As shown in FIG. 2, the denitration burners 14 (14A to 14D) are arranged on the same horizontal plane as the kiln tail 4. Further, it is preferable that 6 to 10 swivel blades are provided at the tip of each denitration burner 14 at a swivel angle of 10 to 50 degrees, as in the cement firing apparatus described in Patent Document 1.
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, the method for denitration of the cement kiln exhaust gas according to the present invention will be described with reference to FIGS. 1 and 2.
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 preheater 2 of the cement firing apparatus 1 preheats the raw material R using the exhaust gas G from the cement kiln 5, and the calcining furnace 3 calcins the raw material R1 from the cyclone 2b of the preheater 2. At this time, the tertiary air G1 from the clinker cooler 6 is blown from the calciner burner 13 together with the fuel F2 to burn the fuel F2. As the fuel F2, pulverized coal, heavy oil, or the like is used, and combustible 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４本の脱硝用バーナー１４（１４Ａ～１４Ｄ）からも燃料Ｆ３を少量の圧送用空気と共に吹き込み、燃料Ｆ３を部分燃焼ガス化させる。４本の脱硝用バーナー１４から吹き込む燃料Ｆ３の量は、４本の脱硝用バーナー１４の合計で、仮焼炉３用の燃料Ｆ２の量の５０％以上１００％以下とする。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 from four denitration burners 14 (14A to 14D) installed in the kiln butt 4 of the cement kiln 5 together with a small amount of pumping air to convert the fuel F3 into partial combustion gas. The amount of fuel F3 blown from the four denitration burners 14 is 50% or more and 100% or less of the total amount of the fuel F2 for the calciner 3 in the total of the four denitration burners 14. As the fuel F3, pulverized coal, heavy oil, and combustible waste can be used as in the fuel F2 for the calcining furnace 3, and any one or a plurality of these may be used at the same time.
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を少量の圧送用空気を用いて部分燃焼ガス化させることで、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 fuel F3 from the denitration burner 14, NOx contained in the combustion gas G of the cement kiln 5 can be reduced in the low oxygen region in the kiln butt. Further, by partially gasifying the fuel F3 with a small amount of pumping air, the raw materials R2 and R3 can be decarboxylated, and the decarboxylation efficiency of the entire cement firing apparatus 1 can be improved. At this time, the swirling blades provided on the denitration burner 14 swirl the mixed flow of the fuel F3 and the combustion air and blow it into the kiln tail 4, so that the combustion efficiency of the fuel F3 is improved.
また、脱硝用バーナー１４全体から吹き込む燃料Ｆ３の量を仮焼炉３用の燃料Ｆ２の量の５０％以上１００％以下と多くしたことで、還元剤量が多くなると共に、窯尻Ｏ2の影響をほとんど受けなくなるため、従来のように窯尻Ｏ2濃度が高い場合に還元効果が低下することがなく、セメントキルン排ガス中のＮＯｘ濃度を効果的に低減することができる。
Further, by increasing the amount of fuel F3 blown from the entire denitration burner 14 to 50% or more and 100% or less of the amount of fuel F2 for the calcining furnace 3, the amount of reducing agent is increased and the amount of the kiln tail O 2 is increased. Since it is hardly affected, the reducing effect does not decrease when the kiln tail O 2 concentration is high as in the conventional case, and the NOx concentration in the cement kiln exhaust gas can be effectively reduced.
さらに、脱硝用バーナー１４が１本の場合には、脱硝用バーナー１４から吹き込まれた燃料はすぐに上方へ移動するため、脱硝用バーナー１４を設置した部位の上部だけＮＯｘが還元されるものの、脱硝用バーナー１４とは反対側のＮＯｘは還元され難く、ＮＯｘの低減効果は小さい。そこで、本発明では、脱硝用バーナー１４を４本設けることで、脱硝用バーナー１４の１本当たりの吹き込み量を減らし、コーチングの付着や燃料同士の衝突を防ぐと共に、窯尻を流れるキルン排ガスとの混合及びキルン排ガス中のＮＯｘとの衝突確率を上げることができる。
Further, when there is only one denitration burner 14, the fuel blown from the denitration burner 14 immediately moves upward, so that NOx is reduced only in the upper part of the portion where the denitration burner 14 is installed. NOx on the side opposite to the denitration burner 14 is difficult to be reduced, and the effect of reducing NOx is small. Therefore, in the present invention, by providing four denitration burners 14, the amount of blown air per denitration burner 14 is reduced to prevent adhesion of coaching and collision between fuels, and the kiln exhaust gas flowing through the kiln tail. It is possible to increase the probability of collision with NOx in the mixture and kiln exhaust gas.
また、脱硝用バーナー１４を同一水平面上に設置することで、キルン排ガス中のＮＯｘとの衝突確率をさらに上昇させることができて好ましい。
Further, by installing the denitration burner 14 on the same horizontal plane, the probability of collision with NOx in the kiln exhaust gas can be further increased, which is preferable.
さらに、窯尻４でＣＯを２％～５％以上発生させることで、セメント原料中のＦｅ2Ｏ3がＦｅＯとなり、さらに大きなＮＯｘ還元効果を奏する。
Further, by generating 2% to 5% or more of CO in the kiln tail 4, Fe 2 O 3 in the cement raw material becomes FeO, and a larger NOx reduction effect is exhibited.
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, 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 obtained clinker is cooled by the clinker cooler 6 to obtain the cement clinker CL. obtain.
上記構成を有するセメント焼成装置１を用いることで、１１０ｐｐｍ（Ｏ2＝１０％）以上のＮＯｘ低減効果が得られた。
By using the cement firing apparatus 1 having the above configuration, a NOx reduction effect of 110 ppm (O 2 = 10%) or more was obtained.
また、図示を省略するが、脱硝用バーナー１４の設置部位にセメント原料によるコーチングが付着するため、プレヒータ２のサイクロンから排出された原料の一部を分取し、脱硝用バーナー１４の設置部位の上方１０００ｍｍから下方１０００ｍｍまでの間に送入することが好ましい。また、これによって原料中のＦｅ2Ｏ3を還元してＮＯｘを脱硝するための還元剤として利用することができる。
Further, although not shown, since coaching by the cement raw material adheres to the installation site of the denitration burner 14, a part of the raw material discharged from the cyclone of the preheater 2 is separated to form the installation site of the denitration burner 14. It is preferable to feed the material between 1000 mm above and 1000 mm below. Further, this can be used as a reducing agent for reducing Fe 2 O 3 in the raw material to denitrify NOx.
尚、上記実施の形態においては、４本の脱硝用バーナー１４を設置したが、脱硝用バーナー１４の本数は４本に限定されず、複数設置することで上記効果を奏する。脱硝用バーナー１４を５本以上設置する場合には、同一水平面上ではなく、上下方向に２段にわたっって配置してもよい。
In the above embodiment, four denitration burners 14 are installed, but the number of denitration burners 14 is not limited to four, and the above effect can be obtained by installing a plurality of burners 14. When five or more denitration burners 14 are installed, they may be arranged in two stages in the vertical direction instead of on the same horizontal plane.
また、セメント焼成装置１がＳＦ式の場合を例示したが、その他の形式のセメント焼成装置であっても本発明を適用することができる。
Further, although the case where the cement firing device 1 is of the SF type is illustrated, the present invention can be applied to other types of cement firing devices.
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
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（１４Ａ～１４Ｄ） 脱硝用バーナー
１５ 主バーナー 1Cement firing device 2 Preheater 2a Bottom cyclone 2b Cyclone 3 from the top 3 Temporary firing furnace 4 Kiln bottom 5 Cement kiln 6 Clinker cooler 13 Temporary firing furnace burner 14 (14A-14D) Denitration burner 15 Main burner
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
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（１４Ａ～１４Ｄ） 脱硝用バーナー
１５ 主バーナー 1
Claims (4)
- セメントキルンの窯尻に複数設けられ、該窯尻内に、全体で、該セメントキルンに付設された仮焼炉で燃焼させる燃料の５０％以上１００％以下の量の燃料及び燃焼用空気を吹き込む脱硝用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 plurality of fuels are provided in the kiln butt of the cement kiln, and 50% or more and 100% or less of the fuel and combustion air are blown into the kiln butt as a whole to be burned in the calciner attached to the cement kiln. A cement firing device characterized by being provided with a burner for use.
- 前記複数の脱硝用バーナーを同一水平面上に設置した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 firing apparatus according to claim 1, wherein the plurality of denitration burners are installed on the same horizontal plane.
- セメントキルンの窯尻に複数設置される脱硝用バーナーから該窯尻内に、該複数の脱硝用バーナー全体で、該セメントキルンに付設された仮焼炉で燃焼させる燃料の５０％以上１００％以下の量の燃料及び圧送用空気を吹き込み、該燃料を低酸素濃度雰囲気下で部分燃焼ガス化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。 From the denitration burners installed at the kiln butt of the cement kiln to the inside of the kiln butt, 50% or more and 100% or less of the fuel to be burned in the calcining furnace attached to the cement kiln in the whole of the plurality of denitration burners. A method for denitration of a cement kiln exhaust gas, which comprises blowing a large amount of fuel and pumping air and converting the fuel into partial combustion gas in a low oxygen concentration atmosphere.
- 該セメントキルンに付設されたサイクロンから排出された原料の一部を分取し、前記脱硝用バーナーの設置部位の上方１０００ｍｍから下方１０００ｍｍまでの間に送入す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 third aspect of claim 3, wherein a part of the raw material discharged from the cyclone attached to the cement kiln is separated and fed between 1000 mm above and 1000 mm below the installation site of the denitration burner. The method for denitration of cement kiln exhaust gas described.
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| KR1020197026676A KR102334004B1 (en) | 2019-08-01 | 2019-08-01 | Cement firing equipment and method of denitration of cement kiln exhaust gas |
| CN201980001791.0A CN112601725A (en) | 2019-08-01 | 2019-08-01 | Cement burning device and denitration method for cement kiln exhaust gas |
| JP2021536566A JP7202467B2 (en) | 2019-08-01 | 2019-08-01 | Method for denitration of cement kiln exhaust gas |
| PCT/JP2019/030139 WO2021019753A1 (en) | 2019-08-01 | 2019-08-01 | Cement firing device and cement kiln exhaust gas denitrification method |
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| CN115287097A (en) * | 2022-08-18 | 2022-11-04 | 南京腾韬工程技术有限公司 | Ultralow emission device for water gas gasification, reduction and denitration of cement kiln |
| WO2023145046A1 (en) * | 2022-01-31 | 2023-08-03 | 太平洋エンジニアリング株式会社 | Cement calcination device and method for denitrifying cement kiln exhaust gas |
| CN117229795A (en) * | 2023-10-12 | 2023-12-15 | 山东美森资源综合利用有限公司 | Multifunctional integrated equipment for replacing dechlorination and denitration and synergistic solid waste treatment of raw material fuel of coal-fired kiln |
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| KR20210015601A (en) | 2021-02-10 |
| JP7202467B2 (en) | 2023-01-11 |
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