JP2000319049A - Production of cement clinker - Google Patents
Production of cement clinkerInfo
- Publication number
- JP2000319049A JP2000319049A JP11124375A JP12437599A JP2000319049A JP 2000319049 A JP2000319049 A JP 2000319049A JP 11124375 A JP11124375 A JP 11124375A JP 12437599 A JP12437599 A JP 12437599A JP 2000319049 A JP2000319049 A JP 2000319049A
- Authority
- JP
- Japan
- Prior art keywords
- nozzle
- synthetic resin
- main fuel
- fuel
- solid synthetic
- 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.)
- Granted
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
- C04B7/4407—Treatment or selection of the fuel therefor, e.g. use of hazardous waste as secondary fuel ; Use of particular energy sources, e.g. waste hot gases from other processes
- C04B7/4423—Waste or refuse used as fuel
-
- 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
Abstract
Description
【０００１】[0001]
【発明が属する技術分野】本発明はセメント原料調合物
を主燃料と固形合成樹脂からなる補助燃料で焼成してセ
メントクリンカーを得るためのセメントクリンカーの製
造方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a cement clinker for obtaining a cement clinker by firing a cement raw material mixture with an auxiliary fuel comprising a main fuel and a solid synthetic resin.
【０００２】[0002]
【従来技術】一般に合成樹脂類は高い発熱量を有するた
め、燃料源として活用することができる。活用に際して
は塩素を含む合成樹脂では８００℃以下で焼成すると有
害なダイオキシンが発生するので、ダイオキシンが分解
する高温領域で燃焼させる必要がある。このため、１４
００℃〜１５００℃の高温焼成が行われるセメント製造
用焼成装置での燃料化活用が検討されている。プラスチ
ック等の可燃性樹脂をセメント調合原料燃焼の燃料に用
いる場合、通常の燃料（一般に重油と微粉炭）を投入す
る場合と同様、ロータリーキルン窯前に設置されたキル
ンバーナ部或いはプラスチック専用に設置されたノズル
からキルン内に投入することが知られている。投入され
るプラスチック等の燃焼については、特開平７−２７７
７８８、特開平８−２８３０５１、或いは特開平８−２
８３０５３に開示されている如く、投入物をロータリー
キルン内の適度な着地範囲または落下範囲で着地燃焼さ
せると、得られるセメントクリンカーなどの焼成物は通
常の燃料で焼成された場合と同様に総じて酸化性雰囲気
で焼成されるため、安定した品質の焼成物が得られると
されている。2. Description of the Related Art In general, synthetic resins have a high calorific value and can be used as a fuel source. When utilizing synthetic resin containing chlorine, harmful dioxin is generated when the resin is baked at 800 ° C. or lower. Therefore, it is necessary to burn in a high temperature region where dioxin is decomposed. For this reason, 14
The utilization of fuel in a sintering apparatus for cement production in which sintering at a high temperature of 00 ° C to 1500 ° C is performed is being studied. When flammable resin such as plastic is used as fuel for cement-combined raw material combustion, it is installed in the kiln burner section installed in front of the rotary kiln kiln or exclusively for plastic, as in the case of adding normal fuel (generally heavy oil and pulverized coal). It is known to feed into a kiln from a nozzle. Japanese Patent Application Laid-Open No. H07-277
788, JP-A-8-283051 or JP-A-8-2
As disclosed in US Pat. No. 83053, when the input material is landed and burned in a moderate landing range or falling range in a rotary kiln, the resulting fired material such as cement clinker is generally oxidizing as in the case of firing with a normal fuel. It is said that since it is fired in an atmosphere, a fired product of stable quality can be obtained.
【０００３】[0003]
【発明が解決しようとする課題】然るに、投入物の着地
範囲や落下範囲を厳密に制御することは容易ではない。
実際にはロータリーキルン内は、クーラーからの２次空
気により搬送される微細なクリンカダストの飛散、また
は石炭燃料中に含まれる灰成分の飛散のため、視界は著
しく悪く、内部の状況を視覚的に把握するのが困難であ
る。このため投入物の落下位置を燃焼中に確認できず、
所望の位置に制御することは困難を極める。また、前記
公報は比較的粒子の大きい廃プラスチック（概ね２０ｍ
ｍ以下）も対象とし、キルン内で着地燃焼させることを
前提としているが、ノズルからキルン内に噴出させる
と、粒子の大きい廃プラスチック等は所望の落下位置に
達せずクーラー落口付近に落下して燃焼するものがあ
る。多少に拘わらずこのような燃焼が見られると、クリ
ンカーの一部が還元性雰囲気で焼成されることになり、
クリンカー性状、特に色調に影響を及ぼす。本発明は、
セメント製造用ロータリーキルンのクリンカー焼成燃料
に通常の主燃料と共に可燃性の合成樹脂を補助燃料とし
て用いる際に起こり得るクリンカーの変質を防ぎ、安定
した品質のクリンカーを得るための製造方法を提供する
ものである。However, it is not easy to strictly control the landing range and the falling range of the input material.
Actually, the visibility inside the rotary kiln is extremely poor due to the scattering of fine clinker dust conveyed by secondary air from the cooler or the scattering of ash components contained in coal fuel. Difficult to figure out. For this reason, the falling position of the input cannot be confirmed during combustion,
Controlling to a desired position is extremely difficult. Also, the above publication discloses waste plastic having relatively large particles (about 20 m).
m or less), and it is assumed that they will be landed and burned in the kiln. However, if they are ejected from the nozzle into the kiln, waste plastics with large particles will not reach the desired drop position and will fall near the cooler outlet. Some burn. If such combustion is seen to some extent, part of the clinker will be fired in a reducing atmosphere,
Affects clinker properties, especially color. The present invention
The present invention provides a manufacturing method for preventing clinker deterioration which may occur when a combustible synthetic resin is used as an auxiliary fuel together with a normal main fuel as a clinker burning fuel for a rotary kiln for cement production, and for obtaining a clinker of stable quality. is there.
【０００４】[0004]
【課題を解決するための手段】本発明者らは前記課題を
解決すべく検討した結果、以下の（１）〜（５）に表す
製造方法によって、投入固形合成樹脂を、主に酸素拡散
による燃焼ではなく、主燃料の燃焼によって発生する輻
射伝熱により着地燃焼させずに空間燃焼させると、投入
後の着地或いは落下位置を制御する必要がなくなり、品
質低下をきたすこと無く安定した品質のセメントクリン
カーが容易に得られることを見出した。Means for Solving the Problems As a result of investigations to solve the above problems, the present inventors have found that a solid synthetic resin to be charged is mainly produced by oxygen diffusion by the following production methods (1) to (5). If the space combustion is performed without landing combustion by radiant heat transfer generated by the combustion of the main fuel instead of combustion, there is no need to control the landing or falling position after input, and cement of stable quality without deteriorating quality It was found that clinker was easily obtained.
【０００５】即ち、本発明は、（１）粒径６ｍｍ以下の
固形合成樹脂を、ロータリーキルン窯前の専用ノズルか
ら、主燃料噴出速度以下の噴出速度且つ旋回角度２０度
以下で補助燃料として吹き込み、セメント原料調合物を
焼成することを特徴とするセメントクリンカーの製造方
法。（２）主燃料噴出速度以下の噴出速度が２５ｍ／ｓ
以下であることを特徴とする前記（１）のセメントクリ
ンカーの製造方法。（３）固形合成樹脂の専用ノズルか
らの吹き出しが、固形合成樹脂と同等以下の重量の空気
と共に吹き出されることを特徴とする前記（１）または
（２）のセメントクリンカーの製造方法。（４）専用ノ
ズル中心と主燃料吹き込みノズル中心との距離をＬ、ロ
ータリーキルン内径をＤとした時、専用ノズルが主燃料
吹き込みノズルからＬ／Ｄ≦０．２５の位置に設置され
ることを特徴とする前記（１）〜（３）の何れかのセメ
ントクリンカーの製造方法。（５）専用ノズル先端が主
燃料の火炎方向に向けて設置されているか、或いは専用
ノズルが主燃料吹き込みノズルの上側にあって専用ノズ
ル先端が水平または下向きに設置されることを特徴とす
る前記（１）〜（４）の何れかのセメントクリンカーの
製造方法。That is, the present invention provides (1) a solid synthetic resin having a particle size of 6 mm or less is blown from a dedicated nozzle in front of a rotary kiln kiln as an auxiliary fuel at an ejection speed equal to or less than the main fuel ejection speed and a swirl angle of 20 degrees or less; A method for producing a cement clinker, which comprises firing a mixture of cement raw materials. (2) An ejection speed equal to or less than the main fuel ejection speed is 25 m / s.
(1) The method for producing a cement clinker according to the above (1), (3) The method for producing a cement clinker according to (1) or (2), wherein the blowout of the solid synthetic resin from the dedicated nozzle is blown together with air having a weight equal to or less than that of the solid synthetic resin. (4) When the distance between the center of the dedicated nozzle and the center of the main fuel injection nozzle is L and the inner diameter of the rotary kiln is D, the dedicated nozzle is installed at a position of L / D ≦ 0.25 from the main fuel injection nozzle. Any one of the above (1) to (3). (5) The dedicated nozzle tip is installed facing the flame direction of the main fuel, or the dedicated nozzle is located above the main fuel injection nozzle and the dedicated nozzle tip is installed horizontally or downward. (1) The method for producing a cement clinker according to any one of (1) to (4).
【０００６】[0006]
【発明の実施の形態】本発明では、セメント原料調合物
を、重油、微粉炭などの主燃料と共に、固形合成樹脂を
補助燃料として併用したロータリーキルンで焼成し、セ
メントクリンカーを得るものである。セメント原料調合
物は焼成してセメントクリンカーを得ることができる公
知の配合組成のものであれば、特に限定されない。補助
燃料に用いる固形合成樹脂は、固形状のプラスチック等
の合成樹脂であれば、化学成分的には何れのものであっ
ても良い。より好適には資源リサイクルの観点から廃棄
に供される固形状の合成樹脂類が望ましい。このような
固形合成樹脂が６ｍｍを超える大きさのものの場合は、
公知の粉砕及び／又は切断等の手法で６ｍｍ以下の大き
さの粒子にして使用する。これは、一般に固体乾紛の輸
送は空気輸送で行われるため所望の速度で容易に行える
ことと、粒子肥大化による燃焼効率の低下をもたらさな
いためである。また合成樹脂類の粉砕は微紛化するほど
多大な粉砕エネルギーを要し、例えば総じて数十μｍ以
下まで粉砕するとセメント製造に通常用いられる主燃料
よりもコスト高の燃料となるので、数ミリ程度の粗大粒
子でも対応できるようにしたものである。従って本発明
は、燃料粒子の微紛化による浮遊効果によって空間滞留
の時間を確保し、空間燃焼を狙うことを意図したもので
は無い。尚、金属等の不燃性異物混入を避けるため粉砕
前又は後にこれらを極力除去し、含水物の場合は適宜乾
燥しておくことが望ましい。更には焼成クリンカーの品
質を保つため、予め脱塩処理を行った固形合成樹脂を用
いることがより望ましい。BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, a cement clinker is obtained by firing a mixture of cement raw materials in a rotary kiln using a solid synthetic resin as an auxiliary fuel together with a main fuel such as heavy oil or pulverized coal. The cement raw material preparation is not particularly limited as long as it has a known composition that can be fired to obtain a cement clinker. The solid synthetic resin used for the auxiliary fuel may be any synthetic resin, such as a solid plastic, in terms of chemical components. More preferably, solid synthetic resins used for disposal are desirable from the viewpoint of resource recycling. When such a solid synthetic resin has a size exceeding 6 mm,
Particles having a size of 6 mm or less are used by a known method such as pulverization and / or cutting. This is because, in general, the transport of solid dry powder is performed by pneumatic transport, so that it can be easily performed at a desired speed, and that the combustion efficiency does not decrease due to particle enlargement. In addition, pulverization of synthetic resins requires a large amount of pulverization energy as the powder becomes finer. It is possible to cope with even coarse particles. Therefore, the present invention is not intended to secure a space residence time by the floating effect due to atomization of the fuel particles and aim at the space combustion. In order to avoid mixing of nonflammable foreign substances such as metals, it is desirable to remove them as much as possible before or after pulverization, and in the case of hydrous substances, it is desirable to dry them appropriately. Further, in order to maintain the quality of the calcined clinker, it is more preferable to use a solid synthetic resin that has been subjected to a desalting treatment in advance.
【０００７】このような固形合成樹脂粒子を、セメント
クリンカー製造用のロータリーキルンの主燃料吹き込み
ノズル（以下、メインバーナーと称す）とは独立して窯
前に設置した補助燃料専用ノズル（以下、専用ノズルと
称す）からキルン内に空気輸送により噴出させる。ここ
でロータリーキルンはセメント製造設備として用いられ
るものであって、窯前にメインバーナーを有するもので
あれば良い。[0007] Such a solid synthetic resin particle is supplied to a nozzle dedicated to an auxiliary fuel (hereinafter referred to as a dedicated nozzle) installed in front of a kiln independently of a main fuel injection nozzle (hereinafter referred to as a main burner) of a rotary kiln for producing cement clinker. ) And eject it into the kiln by air transport. Here, the rotary kiln is used as a cement manufacturing facility, and may have a main burner before the kiln.
【０００８】専用ノズルは、専用ノズル中心とメインバ
ーナーの中心との距離をＬ、ロータリーキルン内径をＤ
とした時、専用ノズルがメインバーナーからＬ／Ｄ≦
０．２５となる位置に設置する。専用ノズルのロータリ
ーキルンの設置がメインバーナーからＬ／Ｄ＞０．２５
の位置では、ノズルより噴出された固形合成樹脂粒子が
主燃料の燃焼による輻射伝熱を十分得られず、その結果
粒子がキルン空間中で燃焼を完結することなくキルン壁
に着地し、そこで燃焼するため好ましくない。更に、専
用ノズル設置位置は、Ｌ／Ｄ≦０．２５であって、主燃
料吹き込みノズルの上側に設置され、且つ、専用ノズル
先端が下向き又はメインバーナーと並行となるよう設置
するのが好ましい。専用ノズルを主燃料吹き込みノズル
の上側に設置できない場合は、専用ノズル先端が主燃料
が形成する火炎方向に向かうように設置しても良い。こ
のように専用ノズルの設置位置を定めるのは、投入され
た固形合成樹脂粒子が主燃料の燃焼による輻射熱を効率
良く十分得ることができるようにするためである。ま
た、専用ノズルは高温にも耐える構造又は材質からなる
ものであれば特に限定され無い。例えばノズル先端口で
の固形合成樹脂粒子の融着防止用に冷却用空気或いは冷
却水を供給するために、ノズルを二重管や三重管等の多
重管構造にすることもできる。更に専用ノズル内径は通
過する粒子の最大粒径を超える大きさであれば、投入粒
子量や噴出速度に応じて適宜選定できる。In the special nozzle, the distance between the center of the special nozzle and the center of the main burner is L, and the inner diameter of the rotary kiln is D.
When the special nozzle is L / D ≦ from the main burner
It is installed at the position where it becomes 0.25. Dedicated nozzle rotary kiln installed from main burner L / D> 0.25
At the position, the solid synthetic resin particles ejected from the nozzle cannot obtain sufficient radiant heat transfer due to the combustion of the main fuel, and as a result, the particles land on the kiln wall without completing combustion in the kiln space, where they burn. Is not preferred. Further, it is preferable that the dedicated nozzle installation position is L / D ≦ 0.25, that the dedicated nozzle is installed above the main fuel injection nozzle, and that the dedicated nozzle tip is directed downward or parallel to the main burner. If the dedicated nozzle cannot be installed above the main fuel injection nozzle, the dedicated nozzle may be installed so that the tip of the dedicated nozzle faces the flame direction formed by the main fuel. The installation position of the dedicated nozzle is determined in this way so that the injected solid synthetic resin particles can efficiently and sufficiently obtain radiant heat from the combustion of the main fuel. The dedicated nozzle is not particularly limited as long as it is made of a structure or a material that can withstand high temperatures. For example, in order to supply cooling air or cooling water to prevent fusion of the solid synthetic resin particles at the nozzle tip port, the nozzle may have a multi-tube structure such as a double tube or a triple tube. Further, the inner diameter of the dedicated nozzle can be appropriately selected according to the amount of the input particles and the ejection speed as long as the size exceeds the maximum particle size of the passing particles.
【０００９】本発明に於いては、主燃料として通常のセ
メント製造用ロータリーキルンで用いられている重油又
は概ね粒径１００μｍ以下の微粉炭を用いる。主燃料は
キルン窯前の主燃料吹き込みノズル（メインバーナー）
により噴出し、主燃料と共にキルン内に噴出される空気
中の酸素との拡散により燃焼される。一方、主燃料噴出
の間、前記固形合成樹脂粒子は補助燃料として専用ノズ
ルによりキルン内に噴出される。補助燃料の噴出速度は
メインバーナーから噴出される主燃料噴出速度を超えな
いものとし、好ましくは概ね２５ｍ／ｓ以下とする。同
時に補助燃料噴出時の旋回角度を２０度以下とする。よ
り好ましくは固形合成樹脂を空気と共に噴出させる際、
固形合成樹脂を該噴出空気に対し重量比で１以上にして
噴出させるのが良い。尚、噴出速度を主燃料噴出速度以
下にするのは、メインバーナーから独立した専用ノズル
より噴出される固形合成樹脂粒子がメインバーナー火炎
からの輻射熱を十分受けることができ、それによってキ
ルン壁への着地前に空間燃焼を完了できるためである。
特に２５ｍ／ｓを超える噴出速度の場合は補助燃料粒子
が燃焼するのに好適なメインバーナー火炎からの輻射熱
を受ける区間を短時間で通過することとなり、着火遅れ
等によりキルン空間で燃焼を完結しきれない粒子が多く
出現し、着地後に燃焼完了する粒子割合が増加するので
好ましくない。また本発明に於ける補助燃料粒子は主燃
料の例えば通常使用されている微粉炭粒子（概ね１００
μｍ以下）よりもかなり大きいため、旋回角度が２０度
を超えると燃焼終了前にキルン壁へ衝突落下し、着地燃
焼する粒子が急増するので好ましくない。更に、固型合
成樹脂粒子はその大きさゆえ、酸素拡散による燃焼より
も主燃料燃焼からの輻射伝熱による燃焼が支配的であ
り、噴出粒子間の距離が小さいほど熱伝播の進行が早
い。このため、固形合成樹脂が空気に対し重量比で１未
満の含有割合の噴出物にすると、固形合成樹脂粒子間の
熱伝播が遅くなるので火炎が生じ難く、キルン壁に着地
する未燃粒子が増加する。尚、主燃料及び主燃料燃焼に
供与される一次空気のキルン内噴出速度及び旋回角度
は、一般のセメント製造時に行われている値と大差が無
い限り特に限定されない。In the present invention, heavy oil or pulverized coal having a particle size of generally not more than 100 μm used in a conventional rotary kiln for cement production is used as a main fuel. The main fuel is the main fuel injection nozzle (main burner) in front of the kiln kiln
The fuel is combusted by diffusion of oxygen in the air ejected into the kiln together with the main fuel. On the other hand, during the ejection of the main fuel, the solid synthetic resin particles are ejected into the kiln by a dedicated nozzle as auxiliary fuel. The ejection speed of the auxiliary fuel should not exceed the ejection speed of the main fuel ejected from the main burner, and is preferably approximately 25 m / s or less. At the same time, the turning angle at the time of auxiliary fuel injection is set to 20 degrees or less. More preferably, when ejecting the solid synthetic resin with air,
It is preferable that the solid synthetic resin is ejected at a weight ratio of 1 or more with respect to the ejected air. The reason why the ejection speed is set to be equal to or less than the main fuel ejection speed is that the solid synthetic resin particles ejected from the dedicated nozzle independent of the main burner can sufficiently receive the radiant heat from the main burner flame, whereby the kiln wall can be cooled. This is because space combustion can be completed before landing.
In particular, when the ejection speed exceeds 25 m / s, the auxiliary fuel particles pass through a section receiving radiant heat from the main burner flame suitable for combustion in a short time, and the combustion is completed in the kiln space due to ignition delay or the like. This is not preferable because many unremovable particles appear and the proportion of particles that are completely burned after landing increases. Further, the auxiliary fuel particles in the present invention are, for example, pulverized coal particles (generally 100) generally used as a main fuel.
Therefore, if the swirl angle exceeds 20 degrees, the particles collide with the kiln wall before the end of combustion, and the number of particles that land and burn undesirably increases. Furthermore, because of the size of the solid synthetic resin particles, combustion by radiant heat transfer from the main fuel combustion is more dominant than combustion by oxygen diffusion, and the smaller the distance between the ejected particles, the faster the heat propagation. For this reason, if the solid synthetic resin is ejected with a content ratio of less than 1 with respect to the air, heat propagation between the solid synthetic resin particles is slowed, so that a flame is hardly generated, and unburned particles landing on the kiln wall are reduced. To increase. The injection speed and swirl angle of the main fuel and the primary air supplied to the main fuel combustion in the kiln are not particularly limited as long as there is no great difference from the values used in general cement production.
【００１０】本発明は、かかる固形合成樹脂をセメント
原料調合物焼成用の補助燃料として前記のような燃焼条
件で用いることにより、主燃料だけで焼成されたセメン
トクリンカーと同程度の品質のものを得ることができ
る。固形合成樹脂を補助燃料として用いた時の焼成条件
は、主燃料だけを用いた焼成の場合と同様、焼成温度
は、概ね１４５０℃程度とし、補助燃料の発熱分は、主
燃料を減少させることにより対応することができる。ま
た、他の焼成条件は通常のセメント原料調合物焼成の場
合と同じで良い。The present invention provides a solid synthetic resin having the same quality as a cement clinker fired only with a main fuel by using such a synthetic resin as an auxiliary fuel for firing a raw material cement mixture under the above-mentioned combustion conditions. Obtainable. The firing conditions when solid synthetic resin is used as the auxiliary fuel are the same as those for firing using only the main fuel. The firing temperature should be approximately 1450 ° C, and the amount of heat generated by the auxiliary fuel should be reduced by the main fuel. Can be dealt with. Other firing conditions may be the same as in the case of normal firing of the raw material mixture.
【００１１】[0011]
【実施例】以下、実施例により本発明を具体的に説明す
るが、本発明はこの実施例に限定されるものでは無い。
まず補助燃料の調整方法として、表１で示す廃棄フィル
ム又は、ポリエチレン、ポリプロピレン、ポリスチレン
テレフタレート及びポリスチレンを主成分として含有す
るプラスチック混合物を、バイマ粉砕機とＣＳカッター
で粉砕した後、振動篩で分級し、表１で表す粒径の固形
合成樹脂粒子を得た。これを定量供給装置で所定の供給
量に調整し、ブロワで搬送空気によりロータリーキルン
へ送り、補助燃料として用いた。EXAMPLES The present invention will be described below in detail with reference to examples, but the present invention is not limited to these examples.
First, as a method of adjusting the auxiliary fuel, a waste film shown in Table 1 or a plastic mixture containing polyethylene, polypropylene, polystyrene terephthalate and polystyrene as main components is crushed by a Bima crusher and a CS cutter, and then classified by a vibration sieve. The solid synthetic resin particles having the particle diameters shown in Table 1 were obtained. This was adjusted to a predetermined supply amount by a quantitative supply device, sent to a rotary kiln by carrier air with a blower, and used as auxiliary fuel.
【００１２】用いたロータリーキルンは全長２７ｍ、内
径（Ｄ）が１．５ｍで、その窯前部分の構造については
図１で略記するように、重油を用いた主燃料噴出ノズル
（メインバーナー）１がロータリーキルン２の窯前に設
置され、該メインバーナーの上側にキャスタブルで外周
を保護された補助燃料噴出専用ノズル３をメインバーナ
ーに並行となるよう設置した。この専用ノズルは、メイ
ンバーナとの距離（Ｌ）を任意に設定できる設置構造に
した。また、専用ノズルの先端に、その角度を任意に変
更できる耐熱性の旋回羽根を設けた。The rotary kiln used has a total length of 27 m and an inner diameter (D) of 1.5 m. The structure of the front part of the kiln has a main fuel injection nozzle (main burner) 1 using heavy oil as schematically shown in FIG. A nozzle 3 dedicated to auxiliary fuel jetting, which is installed in front of the kiln of the rotary kiln 2 and whose outer periphery is protected by a castable above the main burner, is installed in parallel with the main burner. This dedicated nozzle has an installation structure in which the distance (L) from the main burner can be set arbitrarily. Further, a heat-resistant swirl vane whose angle can be arbitrarily changed is provided at the tip of the dedicated nozzle.
【００１３】この専用ノズルからの固形合成樹脂粒子噴
出速度は、ブロアの流量及び／又は専用ノズルの断面積
の変化で調整した。また、固形合成樹脂粒の吹き込み空
気に対する重量比は、ブロアの流量或いは定量供給機か
らの粒子供給量で調整した。尚、固形合成樹脂吹き込み
前の通常運転時の主燃料用重油使用量は約３４０Ｌ／ｈ
であり、キルン内温度は約１４５０℃であった。本例で
はキルン内の発熱量を恒常値に保つため、固形合成樹脂
吹き込み中は、該樹脂燃焼からの発熱分を考慮し、適宜
主燃料供給を減少させてその発熱分を抑えた。またメイ
ンバーナーからの主燃料噴出速度は２５〜２６ｍ／ｓに
保った。The ejection speed of the solid synthetic resin particles from the dedicated nozzle was adjusted by changing the flow rate of the blower and / or the cross-sectional area of the dedicated nozzle. The weight ratio of the solid synthetic resin particles to the blown air was adjusted by the flow rate of the blower or the amount of particles supplied from the quantitative feeder. The amount of heavy fuel oil used for main fuel during normal operation before the injection of solid synthetic resin is about 340 L / h.
And the temperature in the kiln was about 1450 ° C. In this example, in order to keep the calorific value in the kiln at a constant value, during the injection of the solid synthetic resin, the calorific value was suppressed by appropriately reducing the main fuel supply in consideration of the calorific value from the resin combustion. The main fuel ejection speed from the main burner was maintained at 25 to 26 m / s.
【００１４】前記ロータリーキルン並びに固形合成樹脂
からなる補助燃料とその燃焼条件を表１に記載の如く設
定し、それぞれ普通ポルトランドセメント製造用原料調
合物を焼成した。焼成の際は、固形合成樹脂を４時間以
上連続して吹き込んだ。焼成後、得られたセメントクリ
ンカーに重量比３％の石膏を添加し、混合粉砕して得ら
れたセメントを用い、その色調をＪＩＳ Ｚ８７２２に
準じた方法で測定し、Ｌ*ａ*ｂ*表色系でｂ*（ｂ値と称
す）を調べた。その結果も表１に表す。尚、一般に、主
燃料だけで焼成したセメントクリンカーから普通ポルト
ランドセメントを製造した場合のｂ値は６．０〜６．５
であることが知られている。The auxiliary fuel composed of the rotary kiln and the solid synthetic resin and the combustion conditions thereof were set as shown in Table 1, and the raw material preparation for producing ordinary Portland cement was fired. During firing, the solid synthetic resin was continuously blown for 4 hours or more. After firing, 3% by weight of gypsum was added to the obtained cement clinker, and the color tone was measured by a method according to JIS Z8722 using a cement obtained by mixing and pulverizing, and the L * a * b * table was measured. B * (referred to as b value) was examined in the color system. The results are also shown in Table 1. In addition, generally, when producing ordinary Portland cement from cement clinker calcined only with the main fuel, the b value is 6.0 to 6.5.
It is known that
【００１５】[0015]
【表１】 [Table 1]
【００１６】[0016]
【発明の効果】本発明の製造方法に従って、補助燃料に
可燃性の固形合成樹脂粒子を用いてセメント調合原料を
焼成すると、従来法による主燃料のみで焼成されたセメ
ントクリンカーと品質、色などの点で何等劣ら無いセメ
ントクリンカーを得ることができる。また、このことか
ら近年急増している廃プラスチックなどをクリンカー焼
成用の燃料に代替できることから、クリンカー製造コス
トの低減化を図ることができると共に、従来廃棄処分さ
れることが多かった廃プラスチック等の再資源化策とし
ても極めて有望な方法である。According to the production method of the present invention, when a cement compounded raw material is fired using flammable solid synthetic resin particles as an auxiliary fuel, the cement clinker fired only with the main fuel according to the conventional method has the same quality and color. A cement clinker which is not inferior in point can be obtained. In addition, waste plastics, which have been rapidly increasing in recent years, can be replaced by fuel for clinker firing, which can reduce clinker manufacturing costs and reduce waste plastics that have been often disposed of in the past. It is a very promising method for recycling.
【図１】本発明に於けるセメントクリンカー製造に用い
るロータリーキルンのメインバーナ及び補助燃料噴出専
用ノズルの位置関係とその火炎の一例を示す図である。FIG. 1 is a diagram showing an example of a positional relationship between a main burner and a nozzle dedicated to auxiliary fuel ejection of a rotary kiln used for manufacturing a cement clinker according to the present invention and an example of a flame thereof.
１ 主燃料吹き込みノズル（メインバーナ） ２ ロータリーキルン ３ 補助燃料噴出専用ノズル 1 Main fuel injection nozzle (main burner) 2 Rotary kiln 3 Auxiliary fuel injection nozzle
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） Ｆ２３Ｇ 7/00 １０２ Ｆ２３Ｇ 7/00 １０２Ｃ 7/12 ＺＡＢ 7/12 ＺＡＢＺ (72)発明者 玉重 宇幹 東京都千代田区西神田三丁目８番１号 太 平洋セメント株式会社内 (72)発明者 成島 良輔 山口県小野田市大字小野田6276番地 太平 洋セメント株式会社内 Ｆターム(参考） 3K061 AA07 AB01 AC03 AC13 CA02 CA08 FA05 GA01 GA07 3K065 QC02 3K091 AA13 BB05 BB25 BB35 CC02 CC13 CC24 DD01 DD03 4G012 KA01 KA02 ──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 7 Identification symbol FI theme coat ゛ (Reference) F23G 7/00 102 F23G 7/00 102C 7/12 ZAB 7/12 ZABZ (72) Inventor Tamashige Umiki 3-8-1, Nishikanda, Chiyoda-ku, Tokyo Taiheiyo Cement Co., Ltd. (72) Inventor Ryosuke Narushima 6276 Onoda, Onoda-shi, Yamaguchi Prefecture Taiheiyo Cement Co., Ltd. F-term (reference) 3K061 AA07 AB01 AC03 AC13 CA02 CA08 FA05 GA01 GA07 3K065 QC02 3K091 AA13 BB05 BB25 BB35 CC02 CC13 CC24 DD01 DD03 4G012 KA01 KA02
Claims (5)
タリーキルン窯前の専用ノズルから、主燃料噴出速度以
下の噴出速度且つ旋回角度２０度以下で補助燃料として
吹き込み、セメント原料調合物を焼成することを特徴と
するセメントクリンカーの製造方法。1. A solid synthetic resin having a particle size of 6 mm or less is blown from a dedicated nozzle in front of a rotary kiln kiln as an auxiliary fuel at an ejection speed equal to or less than a main fuel ejection speed and a swirl angle of 20 degrees or less, and a cement raw material mixture is fired. A method for producing a cement clinker.
／ｓ以下であることを特徴とする請求項１記載のセメン
トクリンカーの製造方法。2. An injection speed of 25 m or less which is equal to or lower than the main fuel injection speed.
2. The method for producing a cement clinker according to claim 1, wherein the rate is not more than / s.
しが、固形合成樹脂と同等以下の重量の空気と共に吹き
出されることを特徴とする請求項１又は２記載のセメン
トクリンカーの製造方法。3. The method for producing a cement clinker according to claim 1, wherein the blowout of the solid synthetic resin from the dedicated nozzle is blown together with air having a weight equal to or less than that of the solid synthetic resin.
中心との距離をＬ、ロータリーキルン内径をＤとした
時、専用ノズルが主燃料吹き込みノズルからＬ／Ｄ≦
０．２５の位置に設置されることを特徴とする請求項１
〜３の何れか記載のセメントクリンカーの製造方法。4. When the distance between the center of the dedicated nozzle and the center of the main fuel injection nozzle is L and the inner diameter of the rotary kiln is D, the dedicated nozzle is L / D ≦ L / D from the main fuel injection nozzle.
2. The device according to claim 1, wherein the device is installed at a position of 0.25.
4. The method for producing a cement clinker according to any one of items 3 to 3.
けて設置されているか、或いは専用ノズルが主燃料吹き
込みノズルの上側にあって専用ノズル先端が水平または
下向きに設置されることを特徴とする請求項１〜４の何
れか記載のセメントクリンカーの製造方法。5. The dedicated nozzle tip is installed facing the flame direction of the main fuel, or the dedicated nozzle is located above the main fuel injection nozzle and the dedicated nozzle tip is installed horizontally or downward. The method for producing a cement clinker according to claim 1.
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|---|---|---|---|
| JP12437599A JP4465060B2 (en) | 1999-04-30 | 1999-04-30 | Method for producing cement clinker |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12437599A JP4465060B2 (en) | 1999-04-30 | 1999-04-30 | Method for producing cement clinker |
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| Publication Number | Publication Date |
|---|---|
| JP2000319049A true JP2000319049A (en) | 2000-11-21 |
| JP4465060B2 JP4465060B2 (en) | 2010-05-19 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005225736A (en) * | 2004-02-16 | 2005-08-25 | Mitsubishi Materials Corp | Rotary kiln and treating method of combustible waste therewith |
| JP2007045648A (en) * | 2005-08-08 | 2007-02-22 | Mitsubishi Materials Corp | Method for reducing organochlorine compound in exhaust gas in cement manufacturing equipment |
| JP2008105028A (en) * | 2007-10-22 | 2008-05-08 | Mitsubishi Materials Corp | Method for reducing volume and disposing of combustible waste |
| JP2013237571A (en) * | 2012-05-11 | 2013-11-28 | Mitsubishi Materials Corp | Rotary kiln for producing cement |
-
1999
- 1999-04-30 JP JP12437599A patent/JP4465060B2/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005225736A (en) * | 2004-02-16 | 2005-08-25 | Mitsubishi Materials Corp | Rotary kiln and treating method of combustible waste therewith |
| JP2007045648A (en) * | 2005-08-08 | 2007-02-22 | Mitsubishi Materials Corp | Method for reducing organochlorine compound in exhaust gas in cement manufacturing equipment |
| JP2008105028A (en) * | 2007-10-22 | 2008-05-08 | Mitsubishi Materials Corp | Method for reducing volume and disposing of combustible waste |
| JP2013237571A (en) * | 2012-05-11 | 2013-11-28 | Mitsubishi Materials Corp | Rotary kiln for producing cement |
Also Published As
| Publication number | Publication date |
|---|---|
| JP4465060B2 (en) | 2010-05-19 |
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