JPH092850A - Production of cement clinker - Google Patents
Production of cement clinkerInfo
- Publication number
- JPH092850A JPH092850A JP15451195A JP15451195A JPH092850A JP H092850 A JPH092850 A JP H092850A JP 15451195 A JP15451195 A JP 15451195A JP 15451195 A JP15451195 A JP 15451195A JP H092850 A JPH092850 A JP H092850A
- Authority
- JP
- Japan
- Prior art keywords
- furnace
- firing furnace
- waste
- clinker
- calcination
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- 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
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00017—Aspects relating to the protection of the environment
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Ecology (AREA)
- Environmental & Geological Engineering (AREA)
- Environmental Sciences (AREA)
- Public Health (AREA)
- Biodiversity & Conservation Biology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、セメントクリンカを製
造する際に、可燃性の廃棄物を燃料として使用するため
の装置に関する。更に詳しくは、可燃性廃棄物を燃焼す
る際発生する有害物質であるダイオキシンの発生を防止
するセメントクリンカの焼成方法に関する。FIELD OF THE INVENTION The present invention relates to an apparatus for using combustible waste as a fuel in the production of cement clinker. More specifically, the present invention relates to a method for burning cement clinker that prevents the generation of dioxin, which is a harmful substance generated when burning combustible waste.
【０００２】[0002]
【従来技術】現在セメントクリンカの製造装置の代表的
なものとして、高温の燃焼排ガス中にセメント原料粉末
を浮遊させサイクロン等の固気分離器で原料粉末とガス
とを分離させる装置を複数段連結したサスペンション式
予熱器を備えたセメントクリンカ焼成装置がある。2. Description of the Related Art At present, as a typical cement clinker manufacturing device, a device for suspending cement raw material powder in high temperature combustion exhaust gas and separating the raw material powder and gas by a solid-gas separator such as a cyclone is connected in multiple stages. There is a cement clinker firing device equipped with the suspension type preheater.
【０００３】このサスペンション式予熱装置を備えたセ
メントクリンカ焼成装置は、図３に示す通りサイクロン
を４〜５個積み重ね各サイクロン間をガス導管で連結し
た予熱装置と、回転式焼成炉とを連結したもの、或は生
産効率アップと公害防止の面より該予熱装置と回転式焼
成炉との間に仮焼炉を設置したものがある。セメント原
料粉末は該予熱装置の上段より投入され、下方に移動し
ている最中に下方より上昇してくる焼成炉排ガスと熱交
換し加熱され回転式焼成炉に導入される。この際原料粉
末中の石灰成分が脱炭酸されているが、該予熱装置と回
転式焼成炉との間に熱効率の良い仮焼炉を設置し、原料
粉末の脱炭酸反反応を促進している。このように脱炭酸
された原料粉末、いわゆる仮焼された粉末は、回転式焼
成炉内に導入されて該回転式焼成炉内の出口側に設置さ
れているバーナで半溶融状態となるまで燒結されクリン
カとなる。燒結されたクリンカは該回転式焼成炉より排
出され、エアクエンチングクーラにて冷却されている。
冷却の際使用された空気は、クリンカとの熱交換により
高温となって焼成炉の燃焼用空気として焼成炉内に導入
されている。近年省資源と産業廃棄物の有効利用の一環
として、廃タイヤを焼成炉の入口側より投入し、焼成用
の燃料の節減を測っている。In the cement clinker burning device equipped with this suspension type preheating device, as shown in FIG. 3, 4 to 5 cyclones are stacked and a preheating device in which each cyclone is connected by a gas conduit is connected to a rotary burning furnace. In some cases, a calcination furnace is installed between the preheating device and the rotary calcination furnace in order to improve production efficiency and prevent pollution. The cement raw material powder is introduced from the upper stage of the preheating device, exchanges heat with the calcination furnace exhaust gas rising from below while moving downward, is heated, and is introduced into the rotary calcination furnace. At this time, the lime component in the raw material powder is decarbonated, but a calcining furnace with good thermal efficiency is installed between the preheating device and the rotary firing furnace to promote the decarbonation reaction of the raw material powder. . The decarbonated raw material powder, so-called calcined powder, is introduced into a rotary firing furnace and sintered by a burner installed on the outlet side of the rotary firing furnace until it becomes a semi-molten state. It becomes a clinker. The sintered clinker is discharged from the rotary firing furnace and cooled by an air quenching cooler.
The air used for cooling becomes a high temperature due to heat exchange with the clinker and is introduced into the firing furnace as combustion air for the firing furnace. In recent years, as part of resource conservation and effective use of industrial waste, waste tires are put in from the entrance side of the firing furnace to measure the saving of fuel for firing.
【０００４】一方一般及び産業廃棄物は、近年発生量が
増加し、その処理もままならない状態になっており、減
量化のため可燃性のものは焼却処分にされている。この
際使用される焼却炉は、火格子方式、多段路床方式、ロ
ータリーキルン方式、流動炉方式、噴霧燃焼方式、噴流
炉方式等が使用されており、これより火格子式を例に取
り説明する。On the other hand, the amount of general and industrial wastes generated has increased in recent years, and the amount of wastes cannot be processed. The combustible wastes are incinerated to reduce the amount. As the incinerator used at this time, a grate system, a multi-stage subbed system, a rotary kiln system, a fluidized-bed furnace system, a spray combustion system, a jet furnace system, etc. are used, and the grate system will be taken as an example for explanation. .
【０００５】火格子式の焼却炉は、図４に示す構造とな
っており、焼却炉に投入された可燃性の廃棄物は、出口
側に設けられているバーナーにより火格子上で乾燥され
た後燃焼され、燃焼された燃焼灰は、火格子の格子より
下方に落下し燃焼灰用のホッパーに落下し、炉外に排出
される。The grate type incinerator has a structure shown in FIG. 4, and the combustible waste put into the incinerator is dried on the grate by a burner provided on the outlet side. The post-combusted and combusted combustion ash falls below the grate of the grate, falls into the hopper for the combustion ash, and is discharged to the outside of the furnace.
【０００６】[0006]
【発明が解決しようとしている課題】セメントクリンカ
を焼成する際、セメント原料の主成分である炭酸カルシ
ウムは、予熱装置内で一部脱炭酸反応（以下仮焼とい
う）を起こしているが、この仮焼を効率よく行わせるた
め流動層或は噴流層等を用いた仮焼炉を、予熱装置と焼
成炉間に設置し、ほぼ８０〜９０％程度仮焼した仮焼原
料粉を焼成炉内に投入している。そして投入された仮焼
原料粉も該焼成炉内で残りの仮焼を行う事と予熱装置及
び流動層等において気流中を移動するため、仮焼原料の
粒子間にガスを含んだ状態となっている。このため、焼
成炉内においても相当の流動性を有しており、焼成炉内
において半溶融状態にあるクリンカの移動速度に比べ極
めて高速である。このように移動速度の異なる仮焼原料
粉とクリンカの移動速度を焼成炉の回転数等により調整
しているので、焼成炉中で形成される焼成ゾーンの幅が
不安定となり、この焼成ゾーンで形成されるクリンカの
粒径が不均一にならざるをえず、このクリンカを冷却す
る際、冷却用の空気の通風抵抗の増大による冷却用空気
の吹き抜け等が起こり、焼成炉内に導入する燃焼用空気
の温度を高くできないといった問題点を有している。When firing a cement clinker, calcium carbonate, which is the main component of the cement raw material, causes a partial decarboxylation reaction (hereinafter referred to as calcination) in the preheating device. A calcination furnace using a fluidized bed or a spouted bed is installed between the preheating device and the calcination furnace to efficiently perform calcination, and about 80 to 90% of the calcination raw material powder is calcined in the calcination furnace. It is throwing in. The calcination raw material powder that has been charged also performs the remaining calcination in the firing furnace and moves in the air stream in the preheating device, the fluidized bed, etc., so that it becomes a state in which gas is contained between the particles of the calcination raw material. ing. Therefore, it has a considerable fluidity even in the firing furnace, and is extremely high in speed as compared with the moving speed of the clinker in a semi-molten state in the firing furnace. Since the moving speeds of the calcination raw material powder and the clinker having different moving speeds are adjusted by the number of rotations of the baking furnace in this way, the width of the baking zone formed in the baking furnace becomes unstable and The particle size of the clinker formed must be non-uniform, and when this clinker is cooled, blow-through of the cooling air occurs due to an increase in the ventilation resistance of the cooling air, and the combustion introduced into the firing furnace. There is a problem that the temperature of the working air cannot be raised.
【０００７】塩化ビニル樹脂等の塩化物を含有する廃棄
物を焼却する場合、焼却炉内の温度をダイオキシンの分
解温度である８６０〜９２０℃以上に上昇させると、使
用している火格子の焼損、或は焼却灰の溶融等の問題が
あり、ダイオキシンの発生を防止することができないと
いう問題点を有していた。When incinerating waste containing chloride such as vinyl chloride resin, when the temperature in the incinerator is raised to 860 to 920 ° C. which is the decomposition temperature of dioxins, the grate used is burned out. Or, there is a problem such as melting of incinerated ash, and there is a problem that it is impossible to prevent the generation of dioxins.
【０００８】また、塩化ビニル樹脂等の塩化物を含有す
る廃棄物をクリンカ焼成用の回転式焼成炉の入口側より
投入すると、投入廃棄物は比較的低温領域で燃焼し、し
かも該回転式焼成炉内の気流の関係で滞留時間も短く、
しかも焼成条件の関係で低酸素かつＣＯが存在し、セメ
ント原料中に含まれている微量の重金属の循環領域でも
あり、ダイオキシンの生成の条件が揃っているといった
問題点もある。Further, when waste containing chloride such as vinyl chloride resin is charged from the inlet side of the rotary calcination furnace for clinker calcination, the input waste is burned in a relatively low temperature region, and the rotary calcination is performed. The residence time is short due to the air flow in the furnace,
In addition, there is a problem that low oxygen and CO are present due to the firing conditions, it is also a circulation region of a trace amount of heavy metals contained in the cement raw material, and the conditions for producing dioxin are uniform.
【０００９】[0009]
【課題を解決するための手段】本発明は、効率よくセメ
ントクリンカの製造を行い、且つ一般及び産業廃棄物を
処理することと、その際に処理する塩化物を含んだ可燃
性の廃棄物より発生するダイオキシンの発生を防止する
事を目的とする。DISCLOSURE OF THE INVENTION The present invention relates to efficient production of cement clinker and treatment of general and industrial waste, and treatment of chloride-containing combustible waste at that time. The purpose is to prevent the generation of dioxins.
【００１０】予熱装置と焼成炉とを備えたセメントクリ
ンカ焼成装置において、２段の焼成炉を直列に連結し、
最下段の焼成炉の入口側より可燃性の廃棄物を投入する
事を特徴とすると共に、各々の焼成炉を別個に制御する
事により安定した粒径のクリンカを得る事を特徴とする
ものである。In a cement clinker calcination apparatus equipped with a preheating device and a calcination furnace, two calcination furnaces are connected in series,
It is characterized by charging combustible waste from the inlet side of the bottom firing furnace, and by controlling each firing furnace separately, it is possible to obtain a clinker with a stable particle size. is there.
【００１１】この具体的な装置として、セメント原料粉
を予熱する予熱装置と、回転式焼成炉とを、又は該予熱
装置と該回転式焼成炉との間に仮焼炉を備えた焼成装置
において、回転式焼成炉を直列に２段連結し、該回転式
焼成炉の上流側焼成炉の出口側に補助バーナと、下段側
の回転式焼成炉の入口側に廃棄物焼成用のバーナと出口
側にクリンカ焼成用の主バーナとを設置した装置とし、
該２段の焼成炉を各々制御する制御機構を設けたセメン
トクリンカの焼成装置。As a concrete device, a preheating device for preheating cement raw material powder and a rotary calcination furnace, or a calcination device provided with a calcination furnace between the preheating device and the rotary calcination furnace. , Two rotary calcination furnaces are connected in series, an auxiliary burner is provided on the outlet side of the upstream calcination furnace of the rotary calcination furnace, and a burner and an outlet for waste calcination are provided on the inlet side of the lower rotary calcination furnace. A device with a main burner for clinker firing on the side,
A cement clinker firing apparatus provided with a control mechanism for controlling each of the two-stage firing furnaces.
【００１２】セメント原料粉を予熱する予熱装置と、回
転式焼成炉とを、又は該予熱装置と該回転式焼成炉との
間に仮焼炉を備えた焼成装置であり、該回転式焼成炉と
予熱装置又は仮焼炉との間に少なくとも１列以上の流動
炉、噴流炉、気流炉のいずれかを設置した構成とし、該
回転式焼成炉の入口側に廃棄物を燃焼させる燃焼装置と
出口側にクリンカ焼成用の燃焼装置を設置したセメント
クリンカの焼成装置。A preheating device for preheating cement raw material powder and a rotary calcination furnace, or a calcination device provided with a calcination furnace between the preheating device and the rotary calcination furnace. And a preheating device or a calcination furnace, at least one row of which is equipped with a fluidized furnace, a jet furnace, or an airflow furnace, and a combustion device for burning waste at the inlet side of the rotary firing furnace. A cement clinker burning device with a combustion device for burning the clinker on the outlet side.
【００１３】以上の装置を用いて廃棄物を燃焼させる
際、最下段の焼成炉の出口ガス温度を１３００℃に制御
して、産業廃棄物をダイオキシンの分解温度以上の雰囲
気で燃焼させ、前段の焼成炉の出口ガス温度を１０００
℃前後に制御する事により、セメント原料の仮焼を終了
させるとともに、セメント原料中に含まれている微量の
重金属類を蒸発させる事を特徴とするセメントクリンカ
の製造方法よりなるものである。When the waste is burned using the above apparatus, the outlet gas temperature of the firing furnace in the lowermost stage is controlled to 1300 ° C. to burn the industrial waste in an atmosphere having a temperature higher than the decomposition temperature of dioxin. The outlet gas temperature of the firing furnace is 1000
The method comprises a method for producing a cement clinker, which is characterized in that the calcination of the cement raw material is terminated by controlling the temperature to around ℃, and at the same time, a small amount of heavy metals contained in the cement raw material is evaporated.
【００１４】[0014]
【作用】本発明のセメントクリンカの製造方法の発明の
特徴は、セメントクリンカの焼成炉を２段に分割して、
各の焼成炉を独立して制御することにより、前段の焼成
炉で原料を完全に仮焼し、後段でクリンカを焼成すると
ともに、後段の入り口側より廃棄物を投入し、ダイオキ
シンの分解温度以上の雰囲気で燃焼させるとともに、ダ
イオキシンの発生のさい、触媒となる金属類を前段の焼
成炉で蒸発させる等の処置をこうじることにより、焼成
雰囲気中にダイオキシンの発生の原因となる状況を取り
除いた状態でクリンカを製造するものである。The feature of the invention of the method for producing a cement clinker of the present invention is that the firing furnace of the cement clinker is divided into two stages,
By controlling each firing furnace independently, the raw material is completely calcined in the first firing furnace, the clinker is fired in the second stage, and the waste is put in from the inlet side of the second stage, and the dioxin decomposition temperature or higher is reached. The condition that causes the generation of dioxin in the firing atmosphere is eliminated by burning the atmosphere in the same manner as above, and by taking measures such as evaporating the metal used as a catalyst in the firing furnace in the previous stage when the dioxin is generated. To produce clinker.
【００１５】即ち、後段の回転式焼成炉までにセメント
原料の仮焼が終了し、かつ微量の金属類を蒸発させた仮
焼原料とするため、前段の焼成炉内を１０００℃以上に
保つように該焼成炉に設置している燃焼装置の焚き量を
調整するものである。後段の焼成炉においては、出口側
に設置している主燃焼装置により焼成ゾーンにおいてク
リンカ焼成に必要な熱量を与えているが、この焼成ゾー
ンにおいては、窒素酸化物の生成を押さえるため、還元
性の雰囲気で主燃焼装置より吹き込まれる燃料の燃焼が
行われている。従ってこの焼成ゾーンで発生したＣＯと
未燃炭素とを該焼成炉の入口側より投入する廃棄物に含
まれる水分により水性ガス反応を起こさせ、ＣＯを消費
させるとともに、該焼成炉の入口側に設置している補助
燃焼装置よりの燃料の吹き込み及び廃棄物燃焼用の空気
により後段の焼成炉内の空気を乱れさせ、該後段の焼成
炉出口側ガス温度を１３００℃程度となるように制御す
ることにより、投入した廃棄物がダイオキシンの分解温
度以上の高温領域で完全に燃焼することが可能となり、
廃棄物が燃焼する際生成するダイオキシンの生成を防止
することとができる。That is, since the calcination of the cement raw material is completed by the rotary calcination furnace of the latter stage and the calcination raw material is obtained by evaporating a trace amount of metals, the temperature of the former calcination furnace is kept at 1000 ° C. or higher. In addition, the amount of burning of the combustion device installed in the firing furnace is adjusted. In the latter-stage firing furnace, the amount of heat required for clinker firing is given in the firing zone by the main combustion device installed on the outlet side. In this atmosphere, the fuel blown from the main combustion device is burned. Therefore, CO and unburned carbon generated in this firing zone are caused to react with water by the water contained in the waste introduced from the inlet side of the firing furnace to consume CO, and at the same time to the inlet side of the firing furnace. The air in the post-stage firing furnace is disturbed by the fuel injection from the installed auxiliary combustion device and the air for waste combustion, and the gas temperature on the exit side of the post-stage firing furnace is controlled to be about 1300 ° C. As a result, the input waste can be completely burned in the high temperature range above the decomposition temperature of dioxin,
It is possible to prevent the production of dioxins generated when the waste burns.
【００１６】前述のように、前段の焼成炉においてセメ
ント原料粉末の仮焼を終了させることにより、後段の焼
成炉に導入される仮焼原料の流動性を減少させ、しかも
前段の焼成炉が回転式焼成炉の場合はその回転数を、流
動式或は噴流式等の焼成炉の場合は吹き込む空気量等を
調整して、該後段の焼成炉に供給する仮焼原料の量を調
整することにより、焼成ゾーンに供給される仮焼原料の
量が安定し、焼成ゾーンにおけるクリンカの造粒を安定
化させることが可能となる。As described above, by finishing the calcination of the cement raw material powder in the pre-stage firing furnace, the fluidity of the calcination raw material introduced into the post-stage firing furnace is reduced, and the pre-stage firing furnace is rotated. In the case of a firing furnace, the number of revolutions is adjusted, and in the case of a fluidized or jet type firing furnace, the amount of air blown in is adjusted to adjust the amount of calcination raw material supplied to the firing furnace in the subsequent stage. As a result, the amount of the calcination raw material supplied to the firing zone becomes stable, and the granulation of clinker in the firing zone can be stabilized.
【００１７】２段の焼成炉を回転式焼成炉を用いた場
合、回転炉を設置する傾斜角度を導入される材料の性状
に応じて定めるとともに、回転数も別個に制御する。即
ち前段の焼成炉に導入する原料は、クリンカに比べ流動
性を有しており、しかも該原料の仮焼を終了させるた
め、該回転式焼成炉の傾斜を１〜３％として、回転数も
後段の焼成炉に比べて遅くする。また前段の焼成炉内に
おける原料の滞留時間を確保するため、該前段焼成炉の
内径を前半と後半とで変更しても良く、該前段焼成炉の
内径を絞るためダム等を設置しても良い。When a rotary firing furnace is used as the two-stage firing furnace, the inclination angle for installing the rotation furnace is determined according to the properties of the material to be introduced, and the rotation speed is also controlled separately. That is, the raw material introduced into the pre-stage firing furnace has fluidity as compared with the clinker, and further, in order to finish the calcination of the raw material, the inclination of the rotary firing furnace is set to 1 to 3% and the rotation speed is also set. It is slower than the latter firing furnace. Further, in order to secure the residence time of the raw material in the pre-stage firing furnace, the inner diameter of the pre-stage firing furnace may be changed between the first half and the second half, and a dam or the like may be installed to reduce the inner diameter of the pre-stage firing furnace. good.
【００１８】[0018]
【実施例】本発明を実施例により詳細に説明するが、本
発明のセメントクリンカの焼成方法の技術的範囲は本実
施例のみによって限定されるものでない。EXAMPLES The present invention will be described in more detail by way of examples, but the technical scope of the method for firing a cement clinker of the present invention is not limited to these examples.
【００１９】図１は、本発明の第１の実施態様図であ
り、回転式焼成炉を２段直列に連結したものである。FIG. 1 is a diagram of a first embodiment of the present invention, in which two rotary firing furnaces are connected in series.
【００２０】１は、サイクロンを４段直列に連結したサ
スペンション式予熱器であり、２は予熱器１で８００℃
に加熱され一部仮焼された原料を更に仮焼するための流
動式の仮焼炉である。この仮焼炉２で仮焼された原料は
ハウジングを経由して第１段の回転式焼成炉３に導入さ
れ、焼成炉３の出口側に設置している加熱用バーナ４に
て１０００℃以上に加熱される。この際、原料中に含有
されている重金属類はクリンカ中に固定される物以外ほ
とんど蒸発され１００％仮焼が終了した仮焼原料が次の
回転式焼成炉５に導入され、焼成炉５の出口側に設置し
てある主バーナ６により１４５０℃前後まで加熱されて
半溶融状態となるまで焼締められ、セメントクリンカと
なり、次にエアクエンチングクーラ（以下クーラとい
う）７で冷却用の空気と熱交換して冷却される。クリン
カと熱交換した高温の空気一部は、主バーナ６より吹き
込まれる燃料の燃焼用の空気として焼成炉５に回収され
る。更に、焼成炉５には、入口側で可燃性の廃棄物が投
入されており、この廃棄物を燃焼するための補助バーナ
８を設置するとともに、この廃棄物の燃焼用空気として
クーラ７の排気が吹き込まれている。1 is a suspension type preheater in which four cyclones are connected in series, and 2 is a preheater 1 at 800 ° C.
This is a fluidized calcination furnace for further calcination of the partially heated calcinated raw material. The raw material calcined in the calcining furnace 2 is introduced into the first stage rotary calcining furnace 3 via the housing, and the temperature is 1000 ° C. or higher by the heating burner 4 installed on the outlet side of the calcining furnace 3. To be heated. At this time, most of the heavy metals contained in the raw material are evaporated except for those fixed in the clinker, and the calcinated raw material that has been 100% calcined is introduced into the next rotary firing furnace 5 to The main burner 6 installed on the outlet side heats it up to around 1450 ° C. and tightens it until it becomes a semi-molten state, becomes a cement clinker, and then uses an air quenching cooler (hereinafter referred to as cooler) 7 for cooling air. It is cooled by exchanging heat. A part of the high temperature air that has exchanged heat with the clinker is recovered in the firing furnace 5 as air for combustion of the fuel blown from the main burner 6. Further, flammable waste is put into the firing furnace 5 at the inlet side, an auxiliary burner 8 for burning the waste is installed, and the exhaust of the cooler 7 is used as combustion air for the waste. Is blown in.
【００２１】焼成炉５における主バーナ６より吹き込ま
れる燃料の燃焼雰囲気は空気比が１以下の状態で燃焼さ
れているため、未燃カーボンとＣＯが発生しているが、
焼成炉５の入口側より投入される廃棄物を燃焼させるた
めにクーラ７の排気が吹き込まれており、未燃カーボン
とＣＯとを含んだ燃焼排ガスと衝突し、焼成炉５内の気
流が乱されるため未燃カーボンとＣＯと廃棄物の燃焼が
効率よく行われる。また投入される廃棄物に含まれる水
分が蒸発し未燃カーボンとＣＯとの水性ガス反応により
ＣＯも消費される。焼成炉５の出口側ガス温度は１３０
０℃程度となるように燃料と廃棄物の投入量を調整して
いるので、廃棄物はダイオキシンの分解温度である８６
０〜９２０℃以上の高温で燃焼し、しかもダイオキシン
の発生の際触媒作用をする重金属類及び炭化水素類もな
いので、廃棄物燃焼の際問題となるダイオキシンの発生
を押さえる事が可能となった。Since the combustion atmosphere of the fuel blown from the main burner 6 in the firing furnace 5 is burned in a state where the air ratio is 1 or less, unburned carbon and CO are generated.
Exhaust gas from the cooler 7 is blown in to burn the waste that is input from the inlet side of the firing furnace 5, collides with combustion exhaust gas containing unburned carbon and CO, and the air flow in the firing furnace 5 is disturbed. Therefore, the unburned carbon, CO, and waste are efficiently burned. Further, the water contained in the input waste is evaporated and CO is also consumed by the water gas reaction between the unburned carbon and CO. The gas temperature on the outlet side of the firing furnace 5 is 130
Since the input amounts of fuel and waste are adjusted so that the temperature is around 0 ° C, the waste is at the decomposition temperature of dioxins.
Since it burns at a high temperature of 0 to 920 ° C or higher, and there are no heavy metals or hydrocarbons that act as a catalyst when dioxins are generated, it is possible to suppress the generation of dioxins, which is a problem when burning waste. .
【００２２】以上の条件で焼成炉を制御するための操作
条件としては、クリンカと仮焼原料の流動性の差を解消
するため、仮焼を行う第１段の焼成炉３の傾斜を１％に
するとともに、出口側の焼成炉の直径を入口側直径に比
べ１０％程度小さくした形状とし、焼成炉３の入口側の
ガス温度を１０００℃程度となるように出口側に設置し
たバーナ４の炊き量を調節した。この際の焼成炉３出口
の原料温度は１２００℃程度であった。As the operating conditions for controlling the firing furnace under the above conditions, in order to eliminate the difference in fluidity between the clinker and the calcination raw material, the inclination of the first-stage firing furnace 3 for calcination is 1%. In addition, the diameter of the firing furnace on the outlet side is made smaller by about 10% than the diameter on the inlet side, and the burner 4 installed on the outlet side so that the gas temperature on the inlet side of the firing furnace 3 is about 1000 ° C. The cooking amount was adjusted. At this time, the raw material temperature at the outlet of the firing furnace 3 was about 1200 ° C.
【００２３】焼成炉５においては、入口側より可燃性の
廃棄物が投入されており、この廃棄物の燃焼に必要とす
る空気をクーラ７排気より吸引すると同時に補助燃焼用
バーナ８より必要に応じて燃料を吹き込み焼成炉５の出
口ガス温度を１２５０〜１３００℃程度に制御するとと
もに、焼成炉３より投入された仮焼原料を出口側に設置
されている主バーナ６により吹き込まれる燃料の燃焼に
より１４５０℃程度まで加熱されて半溶融の状態まで焼
締められる。この際焼成炉３より投入される原料粉は前
述のごとく１２００℃程度まで加熱されており、原料中
の石灰成分と粘土成分との反応が始まっているため流動
性が減少し、１２５０〜１３００℃間で生成される溶融
層の生成が開始されるが、生成される溶融層と原料粉末
が焼成炉５の回転により適度に混じりあい比較的均一な
粒径に造粒される。この結果クリンカ冷却用のクーラ７
中に設置している火格子上に落下するクリンカの粒径が
安定し、火格子を介して吹き込まれる冷却用の通風抵抗
が均一化したため、クーラの運転状況が安定し熱回収効
率を１０％程度向上させる事ができた。In the firing furnace 5, combustible waste is introduced from the inlet side, and the air required for combustion of this waste is sucked from the exhaust of the cooler 7 and, at the same time, supplied from the auxiliary combustion burner 8 as needed. The temperature of the outlet gas of the firing furnace 5 is controlled to about 1250 to 1300 ° C., and the calcination raw material fed from the firing furnace 3 is burned by the fuel blown by the main burner 6 installed on the outlet side. It is heated up to about 1450 ° C. and is heat-sealed to a semi-molten state. At this time, the raw material powder charged from the firing furnace 3 is heated to about 1200 ° C. as described above, and since the reaction between the lime component and the clay component in the raw material has started, the fluidity is reduced to 1250 to 1300 ° C. The generation of the molten layer generated in the interim is started, but the generated molten layer and the raw material powder are appropriately mixed by the rotation of the firing furnace 5 and granulated into a relatively uniform particle size. As a result, the cooler 7 for cooling the clinker
The particle size of the clinker that falls on the grate installed inside is stable, and the ventilation resistance for cooling that is blown through the grate is uniform, so the operating condition of the cooler is stable and the heat recovery efficiency is 10%. I was able to improve it.
【００２４】第２図は、第１段の回転式焼成炉に変えて
流動層方式の焼成炉を設置した物であり、この流動層方
式の焼成炉の排ガス温度を同様に１０００℃程度とする
事により、回転式焼成炉をもちいた場合と同様の効果を
得ることができる。FIG. 2 shows an apparatus in which a fluidized bed type firing furnace is installed in place of the first stage rotary type firing furnace, and the exhaust gas temperature of this fluidized bed type firing furnace is similarly set to about 1000.degree. By doing so, it is possible to obtain the same effect as when the rotary firing furnace is used.
【００２５】[0025]
【発明の効果】本発明のクリンカ製造方法を採用する事
により、可燃性の廃棄物を焼却処分する際発生する有害
物質であるダイオキシンを発生させることなく、しかも
焼却の際発生する焼却灰もクリンカの成分としてクリン
カ中に取り込まれるため、焼却灰を処理することなく廃
棄物を処分する事が可能となったばかりでなく、クリン
カの粒径が安定したため、クーラの運転状況が安定し、
これに伴い熱回収効率の向上によりクーラー集塵機等の
負荷を軽くする事が可能となった。EFFECTS OF THE INVENTION By adopting the clinker production method of the present invention, the incineration ash generated during incineration is not generated without generating dioxin which is a harmful substance generated when incinerating combustible waste. Since it is taken into the clinker as a component of the clinker, not only was it possible to dispose of the waste without treating the incinerated ash, but the particle size of the clinker was stable, so the operating condition of the cooler was stable,
As a result, the heat recovery efficiency has been improved, making it possible to reduce the load on the cooler dust collector.
【００２６】[0026]
【図１】本発明の第１の実施態様を示すクリンカ焼成方
法の概念図。FIG. 1 is a conceptual diagram of a clinker firing method showing a first embodiment of the present invention.
【図２】本発明の第２の実施態様を示すクリンカ焼成方
法の概念図。FIG. 2 is a conceptual diagram of a clinker firing method showing a second embodiment of the present invention.
【図３】従来のサスペンジョン式予熱方式のクリンカ焼
成方法を示す概念図。FIG. 3 is a conceptual diagram showing a conventional suspension-type preheating clinker firing method.
【図４】従来のストカー式廃棄物燃焼装置の断面図。FIG. 4 is a cross-sectional view of a conventional stoker type waste combustion device.
１：サスペンション式予熱器 ２：流動式仮焼炉 ３：第１段の焼成炉 ４：加熱用バーナ ５：第２段焼成炉 ６：主バーナ ７：エアクエンチングクーラ ８：補助バーナ 1: Suspension type preheater 2: Flow type calcination furnace 3: First stage firing furnace 4: Heating burner 5: Second stage firing furnace 6: Main burner 7: Air quenching cooler 8: Auxiliary burner
───────────────────────────────────────────────────── フロントページの続き (72)発明者 橋本 光一 福岡県北九州市八幡西区洞南町１丁目１番 三菱マテリアル株式会社セメント開発セ ンター内 (72)発明者 石崎 倫朗 福岡県北九州市八幡西区洞南町１丁目１番 三菱マテリアル株式会社セメント開発セ ンター内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Koichi Hashimoto, 1-1, Konan-cho, Hachimansai-ku, Kitakyushu City, Fukuoka Prefecture (72) Inside the cement development center, Mitsubishi Materials Corporation (72) Inoue Rinro Ishizaki, Donan-cho, Hachimansai-ku, Kitakyushu, Fukuoka 1-1, Mitsubishi Materials Corporation Cement Development Center
Claims (4)
え、予熱装置にて粉状又は粒塊状のセメントクリンカ原
料を予熱し、焼成炉においてセメントクリンカを焼成す
るセメントクリンカの製造方法において、焼成炉を直列
に２列連結し、最終列の焼成炉に可燃性の廃棄物を供給
する事を特徴とするセメントクリンカの製造方法。1. A method for producing a cement clinker, comprising at least a preheating device and a calcination furnace, preheating a powdery or granular clinker raw material in the preheating device, and calcining the cement clinker in the calcination furnace. A method for producing a cement clinker, which comprises connecting two columns in series and supplying combustible waste to a firing furnace in the last column.
ある事を特徴とするセメントクリンカの製造方法。2. A method for manufacturing a cement clinker, wherein the firing furnace according to claim 1 is a rotary firing furnace.
式、気流式（ＳＦ式）のいずれかの方式の焼成炉と回転
式焼成炉とを直列に連結する事を特徴とするセメントク
リンカの製造方法。3. The firing furnace according to claim 1, wherein a firing furnace of any one of a fluid type, a jet type and an air flow type (SF type) and a rotary firing furnace are connected in series. Cement clinker manufacturing method.
度が９００℃以上である事を特徴とするセメントクリン
カの製造方法。4. A method for producing a cement clinker, wherein the combustible waste according to claim 1 has a combustion temperature of 900 ° C. or higher.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15451195A JPH092850A (en) | 1995-06-21 | 1995-06-21 | Production of cement clinker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15451195A JPH092850A (en) | 1995-06-21 | 1995-06-21 | Production of cement clinker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH092850A true JPH092850A (en) | 1997-01-07 |
Family
ID=15585856
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15451195A Pending JPH092850A (en) | 1995-06-21 | 1995-06-21 | Production of cement clinker |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH092850A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2876782A1 (en) * | 2004-10-19 | 2006-04-21 | Technip France Sa | INSTALLATION AND METHOD FOR CALCINING A MINERAL CHARGE CONTAINING CARBONATE TO PRODUCE A HYDRAULIC BINDER |
| JP2008194688A (en) * | 2008-02-13 | 2008-08-28 | Taiheiyo Cement Corp | Dioxin-pyrolyzing method |
| JP2013133254A (en) * | 2011-12-26 | 2013-07-08 | Taiheiyo Cement Corp | Cement firing apparatus |
-
1995
- 1995-06-21 JP JP15451195A patent/JPH092850A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2876782A1 (en) * | 2004-10-19 | 2006-04-21 | Technip France Sa | INSTALLATION AND METHOD FOR CALCINING A MINERAL CHARGE CONTAINING CARBONATE TO PRODUCE A HYDRAULIC BINDER |
| WO2006042923A3 (en) * | 2004-10-19 | 2006-06-15 | Technip France | Installation and method for the calcination of a mineral load containing a hydraulic binder |
| US7549859B2 (en) | 2004-10-19 | 2009-06-23 | Technip France | Installation and process for calcining a mineral load containing a carbonate in order to produce a hydraulic binder |
| JP2008194688A (en) * | 2008-02-13 | 2008-08-28 | Taiheiyo Cement Corp | Dioxin-pyrolyzing method |
| JP2013133254A (en) * | 2011-12-26 | 2013-07-08 | Taiheiyo Cement Corp | Cement firing apparatus |
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