JP2009234835A - Method of making abandoned automobile shredder dust into fuel for firing cement - Google Patents
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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
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- Y02P40/00—Technologies relating to the processing of minerals
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- Y02P40/125—Fuels from renewable energy sources, e.g. waste or biomass
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Abstract
Description
本発明は、廃自動車シュレッダーダストのセメント焼成用燃料化方法に関し、特に廃自動車シュレッダーダストをセメント焼成工程に導入しながら、セメント製造工程及び製品セメントの品質に悪影響を及ぼさない廃自動車シュレッダーダストのセメント焼成用燃料化方法に関するものである。 TECHNICAL FIELD The present invention relates to a method of converting waste automobile shredder dust into a cement firing fuel, and in particular, waste automobile shredder dust cement that does not adversely affect cement manufacturing process and product cement quality while introducing waste automobile shredder dust into cement firing process. The present invention relates to a method for making a fuel for firing.
廃棄された廃自動車から、他の車の補修等に利用可能な部品や廃棄する上で問題を生じ得る部品を取り外した上で該廃自動車を破砕し、さらに金属等の有価物を分別手段により回収した後の破砕残渣を、廃自動車シュレッダーダスト（ＡＳＲ：Automobile Shredder Residue）と称している。 After removing the parts that can be used for repairing other cars or parts that may cause problems in disposal from the scrapped scrapped car, the scrapped car is crushed, and valuables such as metal are separated by means of separation. The crushing residue after collection | recovery is called an abandoned automobile shredder dust (ASR: Automobile Shredder Residue).
この廃自動車シュレッダーダストは、主にプラスチック、ゴム、スポンジ等の可燃物やガラス等の無機物を主体とするものであるが、微量の重金属や有機溶剤等の有害物を含有するため、埋め立て処分する場合には管理型処分場を用いる必要がある。近年、処分場の逼迫と共にその処分コストが高騰する傾向があり、廃自動車シュレッダーダスト中の可燃物の有する発熱量等を有効利用できるリサイクル方法が求められていた。 This waste car shredder dust is mainly composed of combustible materials such as plastic, rubber and sponge, and inorganic materials such as glass, but it is disposed of in landfills because it contains trace amounts of harmful metals such as heavy metals and organic solvents. In some cases, it is necessary to use a managed disposal site. In recent years, the disposal cost tends to increase with the tightness of the disposal site, and a recycling method that can effectively use the calorific value of the combustibles in the scrapped car dust has been demanded.
このような観点から、特許文献１には、廃棄車輌のシュレッダーダストをセメントクリンカー原料として使用し、該原料からセメントを製造する方法が開示されている。 From this point of view, Patent Document 1 discloses a method for producing cement from a shredder dust of a discarded vehicle as a cement clinker raw material.
しかしながら、廃自動車シュレッダーダストには多様な成分が存在しており、その中にはセメントに含有されることが好ましくない成分もある。したがって、実際には廃自動車シュレッダーダストのセメント原燃料への使用は全く行なわれてこなかったのが実状である。 However, there are various components in scrap car shredder dust, and some of them are not preferable to be contained in cement. Therefore, the actual situation is that the waste car shredder dust has not been used as a raw material for cement.
ところが、近年の資源価格の上昇等の理由により、分別処理が徹底されるようになり、前記のセメントに含有されることが好ましくない成分の代表である塩素・金属類等が低減される傾向にあり、廃自動車シュレッダーダストをセメント原燃料へ使用できる可能性が生じている。特に、セメント焼成用燃料である石炭等の化石燃料の価格の高騰のため、廃自動車シュレッダーダストの化石燃料に替わる代替燃料としての使用に期待が持たれているという状況がある。そこで、本発明者らは、現状の廃自動車シュレッダーダストについて、どのような条件を満たせば、それを今まで全く用いられてこなかったセメント原燃料へ使用できるか、特に高温のプロセスであるがゆえに一定の発熱量の確保が求められるセメント焼成用燃料へ効果的に使用でき、かつセメント品質、セメント製造工程等への悪影響を防止し得るかということを追求した結果、本願で提案する廃自動車シュレッダーダストのセメント焼成用燃料化方法を見出すに至った。 However, due to the recent increase in resource prices, etc., the separation process has become thorough and tends to reduce chlorine, metals, etc., which are representative of components that are not preferably contained in the cement. Yes, there is a possibility that scrap car shredder dust can be used as cement raw fuel. In particular, due to the rising price of fossil fuels such as coal, which is a fuel for burning cement, there is a situation where there is an expectation for use as a substitute fuel for fossil fuels for scrapped car shredder dust. Therefore, the present inventors are able to use the existing scrap car shredder dust as a cement raw fuel that has not been used at all, because it is a high-temperature process. As a result of pursuing whether it can be used effectively for cement firing fuels that require a certain amount of heat generation and can prevent adverse effects on cement quality, cement manufacturing processes, etc. It came to find the method of making dust cement fuel.
本発明者らは、上記の課題を鋭意追求した結果、廃自動車シュレッダーダストは微粒分にガラス破砕物等の無機物が多く存在し、発熱量が低いこと、アルカリ等の成分も多いことを発見し、この微粒分を一定レベル以下に管理することにより、廃自動車シュレッダーダストを好適にセメント焼成用燃料として用い得ることを見出し、本発明を完成した。 As a result of earnestly pursuing the above-mentioned problems, the present inventors have found that waste car shredder dust contains a large amount of inorganic substances such as crushed glass in fine particles, has a low calorific value, and has many components such as alkali. The present inventors have found that by controlling the fine particle content to a certain level or less, it is possible to suitably use scrap car shredder dust as a cement firing fuel.
すなわち、本発明は、次の〔１〕〜〔６〕のものである。
〔１〕５ｍｍ篩下質量比が３０％以下の廃自動車シュレッダーダストを、セメント焼成工程に導入することを特徴とする廃自動車シュレッダーダストのセメント焼成用燃料化方法。
〔２〕前記廃自動車シュレッダーダストが、総発熱量４，５００ｋｃａｌ／ｋｇ以上、塩素含有量３．０質量％以下であることを特徴とする〔１〕に記載の廃自動車シュレッダーダストのセメント焼成用燃料化方法。
〔３〕前記セメント焼成工程のロータリーキルンの窯尻からボトムサイクロン に至るまでのキルン排ガス流路より燃焼ガスの一部を抽気することを特徴とする〔１〕又は〔２〕に記載の廃自動車シュレッダーダストのセメント焼成用燃料化方法。
〔４〕前記廃自動車シュレッダーダストのセメント焼成工程への導入位置が、ロータリーキルンの窯尻部分であることを特徴とする〔１〕乃至〔３〕に記載の廃自動車シュレッダーダストのセメント焼成用燃料化方法。
〔５〕前記セメント焼成工程へ導入する前の貯留設備からの廃自動車シュレッダーダストの抽出を、解砕機能を有する抽出機により行なうことを特徴とする〔１〕乃至〔４〕に記載の廃自動車シュレッダーダストのセメント焼成用燃料化方法。
〔６〕前記廃自動車シュレッダーダストを、セメント生産量１トン当り１．５ｋｇ以上の投入量でセメント焼成工程に導入することを特徴とする〔１〕乃至〔５〕に記載の廃自動車シュレッダーダストのセメント焼成用燃料化方法。
That is, the present invention includes the following [1] to [6].
[1] A method for converting waste automobile shredder dust into a fuel for cement firing, comprising introducing waste automobile shredder dust having a mass ratio of 5% or less under a sieve of 30% or less into the cement firing step.
[2] The waste car shredder dust has a total calorific value of 4,500 kcal / kg or more and a chlorine content of 3.0% by mass or less. Fueling method.
[3] A scrapped vehicle shredder according to [1] or [2], wherein a part of the combustion gas is extracted from a kiln exhaust gas passage from the bottom of the rotary kiln to the bottom cyclone in the cement firing step A method for converting dust into a cement firing fuel.
[4] The waste car shredder dust as a fuel for cement firing of the waste car shredder dust according to any one of [1] to [3], wherein the waste car shredder dust is introduced into the kiln bottom of a rotary kiln. Method.
[5] The scrapped automobile according to any one of [1] to [4], wherein the shredder dust is extracted from the storage facility before being introduced into the cement firing step by an extractor having a crushing function. A method of converting shredder dust into a cement firing fuel.
[6] The waste car shredder dust according to any one of [1] to [5], wherein the waste car shredder dust is introduced into the cement firing process at an input amount of 1.5 kg or more per 1 ton of cement production. Cement firing fuel conversion method.
以上の本発明に係る廃自動車シュレッダーダストのセメント焼成用燃料化方法によれば、廃自動車シュレッダーダストをセメント焼成用の化石燃料の代替燃料として有効に用い得ると共に、セメント品質、セメント製造工程等への悪影響を防止することができる。 According to the above-described fuel conversion method for waste automobile shredder dust according to the present invention, waste automobile shredder dust can be effectively used as an alternative fuel for fossil fuel for cement firing, and to cement quality, cement manufacturing process, and the like. Can prevent adverse effects.
以下に、本発明に係る廃自動車シュレッダーダスト（以下、廃自動車シュレッダーダストをＡＳＲと略称する場合もある。）のセメント焼成用燃料化方法の実施の形態について説明する。 In the following, an embodiment of a method for converting a waste car shredder dust (hereinafter, abbreviated car shredder dust may be abbreviated as ASR) into a cement firing fuel according to the present invention will be described.
本発明に関連して言うＡＳＲとは、廃棄された廃自動車から、他の車の補修等に利用可能な部品や廃棄する上で問題を生じ得る部品を取り外した上で該廃自動車の車体を破砕機を用いて最大径１００ｍｍ程度まで破砕し、さらに磁力選別、風力選別、手選別等の分別手段により金属等の有価物を回収した後に残る破砕残渣のことを言う。 ASR in relation to the present invention refers to a scrapped automobile after removing parts that can be used for repair of other cars and parts that may cause problems in disposal and then removing the body of the scrapped car. This refers to the crushing residue that remains after crushing to a maximum diameter of about 100 mm using a crusher and further recovering valuable materials such as metals by sorting means such as magnetic sorting, wind sorting, and manual sorting.
このＡＳＲは、成分としては主にプラスチック類、ゴム類、スポンジ（ウレタン）類等の可燃性の有機物や、ガラス類、回収されなかった金属類等の無機物を主体とするものであり、微視的に見ると、繊維状、砕片状、微粒状等の種々の形態の物質の混在物であるが、セメント焼成用燃料としての用途の様に、１時間当たり数百ｋｇを使用するような巨視的な観点から見ると、大略均一な混合物とみなし得るものである。また、前述の通りＡＳＲは可燃物を多く含有するため、５，０００ｋｃａｌ／ｋｇ前後の総発熱量を有し、セメント焼成用燃料等の代替燃料として、好適に用い得るものである。 This ASR is mainly composed of combustible organic substances such as plastics, rubbers, sponges (urethanes), etc., and inorganic substances such as glasses and uncollected metals. If you look at it, it is a mixture of substances in various forms such as fibrous, debris, fine particles, etc., but it is macroscopic to use several hundred kg per hour as used as a fuel for cement firing. From a general point of view, it can be regarded as a substantially uniform mixture. As described above, since ASR contains a large amount of combustibles, it has a total calorific value of around 5,000 kcal / kg and can be suitably used as an alternative fuel such as cement firing fuel.
本発明のセメント焼成用燃料化方法においては、５ｍｍ篩下質量比が３０％以下の廃自動車シュレッダーダストを、セメント焼成工程に導入する。ここで、５ｍｍ篩下質量比は、乾燥物基準であり、以下の手法により求める。まずＡＳＲのサンプルを１０５℃で乾燥し、水分量を求める。続いて、１９ｍｍ篩を用いて篩分する。１９ｍｍ篩の篩上は、大径又は長尺のプラスチック、ゴム、スポンジ（ウレタン）、金属である。次に、１９ｍｍ篩下の細粒分を５ｍｍ篩を用いて篩分する。そして、乾燥後の全体の質量に対する１９ｍｍ篩上、５〜１９ｍｍ（以下５ｍｍ篩上と称する）、５ｍｍ篩下のそれぞれの粒群の質量比を求める。 In the fueling method for cement firing according to the present invention, waste automobile shredder dust having a 5 mm sieve mass ratio of 30% or less is introduced into the cement firing step. Here, the mass ratio under 5 mm is based on the dry matter and is determined by the following method. First, the ASR sample is dried at 105 ° C., and the water content is determined. Subsequently, sieving is performed using a 19 mm sieve. The top of the 19 mm sieve is large or long plastic, rubber, sponge (urethane), or metal. Next, the fine particles under the 19 mm sieve are sieved using a 5 mm sieve. Then, the mass ratio of each particle group on the 19 mm sieve, 5 to 19 mm (hereinafter referred to as 5 mm sieve) and 5 mm sieve on the total mass after drying is obtained.
５ｍｍ篩下の微粒分には、ガラス破砕物等が多く存在し、成分としてＳｉＯ２やＮａ２Ｏが多いため、発熱量が低い。したがって、５ｍｍ篩下の微粒分が多いＡＳＲは代替燃料として好ましくない。 In the fine particles under the 5 mm sieve, there are many crushed glass and the like, and since there are many SiO 2 and Na 2 O as components, the calorific value is low. Therefore, ASR with a large amount of fine particles under a 5 mm sieve is not preferable as an alternative fuel.
また、Ｎａ２Ｏのようなアルカリ分が多くなると、それがセメント成分として取り込まれた時、セメント使用時にアルカリ骨材反応を引き起こすこととなったり、水和初期の反応に影響を与えたりして、好ましくないことが多い。さらに、５ｍｍ篩下の微粒分には無機物が多く、嵩比重が大きいが、一方、５ｍｍ篩上及び１９ｍｍ篩上の粗粒分は比重の小さい有機物が多く、またその形状からしても嵩比重が小さくなる。よって、微粒分の多いＡＳＲは、輸送工程、貯留工程等を経る間に、微粒分、粗粒分の偏析による成分変動が大きくなる傾向がある。これらの点でも、微粒分の多いＡＳＲの使用は好ましくない。 In addition, when the alkali content such as Na 2 O is increased, when it is incorporated as a cement component, an alkali aggregate reaction may be caused at the time of cement use, or the reaction at the initial stage of hydration may be affected. Often not preferred. Furthermore, the fine particles under the 5 mm sieve are rich in inorganic substances and have a large bulk specific gravity. On the other hand, the coarse particles on the 5 mm sieve and the 19 mm sieve have many organic substances with a small specific gravity. Becomes smaller. Therefore, ASR with a large amount of fine particles tends to have a large component fluctuation due to segregation of the fine particles and coarse particles during the transport process, the storage process, and the like. From these points, the use of ASR having a large amount of fine particles is not preferable.
以上のような理由から、本発明のセメント焼成用燃料化方法においては、５ｍｍ篩下質量比が３０％以下のＡＳＲを代替燃料としてセメント焼成工程に導入する。５ｍｍ篩下質量比の値は、廃自動車を破砕、分別する処理施設により凡その値が決まってしまうので、該値が３０％以下である処理施設を選定してＡＳＲを導入することができる。また、５ｍｍ篩下質量比が３０％を超えるＡＳＲを、さらに篩分等により５ｍｍ篩下質量比３０％以下として用いることもできる。 For the reasons as described above, in the cement firing fuel conversion method of the present invention, ASR having a 5 mm under-sieving mass ratio of 30% or less is introduced as an alternative fuel into the cement firing step. Since the value of the mass ratio under the 5 mm sieve is roughly determined by the processing facility for crushing and separating the used automobile, ASR can be introduced by selecting a processing facility whose value is 30% or less. Further, ASR having a 5 mm sieve mass ratio exceeding 30% can be further used as a 5 mm sieve mass ratio of 30% or less by sieving or the like.
セメント焼成用の代替燃料としては、ＡＳＲの総発熱量４，５００ｋｃａｌ／ｋｇ以上であることが好ましい。これを下回ると、ＡＳＲ使用に伴う諸コスト等を考慮すると、代替燃料として用いるメリットが小さくなる。 As an alternative fuel for cement firing, the total calorific value of ASR is preferably not less than 4,500 kcal / kg. Below this value, the merits of using it as an alternative fuel are reduced in consideration of various costs associated with the use of ASR.
ＡＳＲ中の塩素含有量は３．０質量％以下であることが好ましい。セメント製造工程中に持ち込まれる塩素量が増加すると、セメント品質への悪影響、セメント焼成工程におけるコーティングが増加し閉塞等のトラブルが生じる可能性等が考えられる。特に、製品セメント中の塩素濃度は３５０ｐｐｍ以下と規格が定められており、これを余裕を持ってクリアするためには、他の原燃料中の塩素量等を勘案すると代替燃料として用いるＡＳＲ中の塩素含有量は上記数値以下であることが望まれる。 The chlorine content in the ASR is preferably 3.0% by mass or less. If the amount of chlorine brought in during the cement manufacturing process increases, there may be adverse effects on the cement quality, the coating in the cement firing process may increase, and troubles such as clogging may occur. In particular, the chlorine concentration in the product cement is specified as 350 ppm or less, and in order to clear this with sufficient margin, the amount of chlorine in other raw fuels is taken into account, and the ASR used as an alternative fuel It is desirable that the chlorine content is not more than the above numerical value.
ＡＳＲを代替燃料として使用するセメント焼成工程は、ロータリーキルンの窯尻からボトムサイクロン に至るまでのキルン排ガス流路より燃焼ガスの一部を抽気する、所謂塩素バイパスシステムを備えることが好ましい。該システムを備えることにより、ロータリーキルンとプレヒーターの間で循環する塩素量を低減することができ、前記のコーティングが増加し閉塞等のトラブルが生じることを防止することができる。該システムによる抽気率は、２％以上であることが好ましく、前記の循環する塩素量を把握して決定することが望ましい。 The cement firing process using ASR as an alternative fuel preferably includes a so-called chlorine bypass system that extracts a part of the combustion gas from the kiln exhaust gas passage from the kiln bottom of the rotary kiln to the bottom cyclone. By providing this system, the amount of chlorine circulated between the rotary kiln and the preheater can be reduced, and it is possible to prevent the coating from increasing and causing troubles such as blockage. The bleed rate by the system is preferably 2% or more, and it is desirable to determine and determine the circulating chlorine amount.
ＡＳＲのセメント焼成工程への導入位置は、仮焼炉、ロータリーキルンの窯尻部分、ロータリーキルンの窯前等があり得るが、ＡＳＲは最大径１００ｍｍ程度と比較的大きな破砕片を含むためバーナーでの燃焼は困難であることを考えると、ロータリーキルンの窯尻部分への導入が好ましい。 ASR can be introduced into the cement firing process at the calcining furnace, rotary kiln bottom, before the kiln of the rotary kiln, etc., but ASR contains a relatively large crushed piece with a maximum diameter of about 100 mm, so it burns with a burner. In view of the difficulty, it is preferable to introduce the rotary kiln into the kiln bottom.
ＡＳＲは前述のとおり、比較的大きな破砕片を含み、繊維状のものも多いため、絡まりあう性質があり、セメント焼成工程へ導入する前の貯留設備から抽出する際、団塊のまま排出されてしまい、スムーズに排出されない傾向がある。そこで、該貯留設備からの抽出を、解砕機能を有する抽出機によりほぐしながら行なうことが好ましい。具体的には、レーキフィーダー等を用いて好適に抽出を行なうことができる。 As mentioned above, ASR contains relatively large fragments and many fibrous ones, so they have entanglement properties, and when extracted from the storage facility before being introduced into the cement firing process, they are discharged as a nodule. , Tend not to be discharged smoothly. Therefore, it is preferable to perform extraction from the storage facility while loosening with an extractor having a crushing function. Specifically, extraction can be suitably performed using a rake feeder or the like.
ＡＳＲは前述のとおり絡まりあう性質があるため、微量での抽出が困難であること、ＡＳＲ使用に伴う諸コスト等を勘案しても代替燃料としてのメリットが出るようにすべきことを考慮すると、セメント生産量１トン当り１．５ｋｇ以上の投入量でセメント焼成工程に導入することが好ましい。 As ASR has the property of being entangled as described above, considering that it is difficult to extract in a very small amount, and that the benefits as an alternative fuel should be obtained even when considering the costs associated with the use of ASR, It is preferable to introduce into the cement firing step with an input amount of 1.5 kg or more per ton of cement production.
以上、本発明に係る廃自動車シュレッダーダストのセメント焼成用燃料化方法の実施の形態を説明したが、本発明はこれらの記載に限定されるものではなく、特許請求の範囲に記載した技術思想の範囲内及びその均等の範囲内において、種々の変更等が可能であることはいうまでもない。 As mentioned above, although embodiment of the fuel conversion method for cement burning of the waste car shredder dust which concerns on this invention was described, this invention is not limited to these description, The technical thought described in the claim It goes without saying that various changes and the like can be made within the range and the equivalent range.
１．ＡＳＲ性状の測定
Ａ、Ｂ、Ｃ ３箇所の廃自動車処理施設より発生した３種のＡＳＲサンプルについて、前述の方法で乾燥し、総発熱量を測定（JIS
Z 7302-2に準拠）した。さらに篩分けを行い、１９ｍｍ篩上、５ｍｍ篩上、５ｍｍ篩下のそれぞれの粒群の質量比を求めた。また、５ｍｍ篩上、５ｍｍ篩下の各粒群については、ＳｉＯ２及びＮａ２Ｏの含有量を分析（蛍光Ｘ線分析）して求めた。なお、ここでは、実際の１９ｍｍ篩の篩上の物質から手選別でプラスチック、ゴム、スポンジ、金属を拾い出したものを合わせて１９ｍｍ篩上の粒群とみなし、実際の１９ｍｍ篩の篩上の物質の残部は１９ｍｍ篩下の物質と合わせて、５ｍｍ篩による篩分を行なっている。
得られた測定値を表１に示す。
1. Measurement of ASR properties A, B, C Three types of ASR samples generated from three waste car treatment facilities were dried by the method described above, and the total calorific value was measured (JIS
Z 7302-2). Further, sieving was performed, and the mass ratio of each particle group on the 19 mm sieve, on the 5 mm sieve, and on the 5 mm sieve was determined. Further, on 5mm sieve, for each particle group under 5mm sieve, it was determined by analyzing the content of SiO 2 and Na 2 O (X-ray fluorescence analysis). In this case, plastics, rubber, sponges, and metals picked up from the material on the actual 19 mm sieve by hand are combined and regarded as a particle group on the 19 mm sieve, and on the actual 19 mm sieve. The remainder of the substance is sifted with a 5 mm sieve together with the substance under the 19 mm sieve.
The obtained measured values are shown in Table 1.
表１より、５ｍｍ篩下質量比が低く、３０％以下であるサンプルＡ及びＢは、総発熱量が４，５００ｋｃａｌ／ｋｇ以上と高く、セメント焼成用代替燃料として好ましい性状であることがわかる。また、各サンプルとも、５ｍｍ篩下のＳｉＯ２及びＮａ２Ｏの含有量が高く、この粒群がセメント焼成用代替燃料として好ましくない成分であることがわかる。 From Table 1, it can be seen that Samples A and B having a low 5 mm sieve mass ratio of 30% or less have a high total calorific value of 4,500 kcal / kg or more and are preferable properties as an alternative fuel for cement firing. In addition, each sample has a high content of SiO 2 and Na 2 O under a 5 mm sieve, and it can be seen that this group of grains is an unfavorable component as an alternative fuel for cement firing.
２．セメント焼成工程での代替燃料としての使用
時産１７０トンのＮＳＰ付ロータリーキルンを有するセメント焼成工程のロータリーキルンの窯尻部分から、表１のＡに相当するＡＳＲを、３５０ｋｇ／ｈ（セメント生産量１トン当り２．１ｋｇ）で投入した。このＡＳＲの塩素含有量は２．２質量％であり、該セメント焼成工程に設置された塩素バイパスシステムで、抽気率２．０％で抽気を行なった。
運転結果は、以下のとおりであった。
・ＡＳＲがセメント焼成用代替燃料として効果的に作用し、セメント焼成工程で使用する石炭を０．２５ｔ／ｈ減じることができた。
・製造されたセメント中の塩素濃度は、塩素濃度の規格値３５０ｐｐｍまでは余裕があり、品質上も全く問題が無かった。
・プレヒーターへのコーティングの付着状況を観察したが、影響はみとめられなかった。また、その他のセメント焼成工程の運転状況にも悪影響はみられなかった。
・ＡＳＲの輸送工程、貯留工程において、問題になる程度の微粒分、粗粒分の偏析による成分変動はみとめられなかった。
・ＡＳＲ投入ホッパーからの抽出部にレーキフィーダーを設置した。その結果、からみあい団塊を形成するＡＳＲを、レーキフィーダーでほぐしながら抽出するので、スムーズに抽出することができた。
2. ASR equivalent to A in Table 1 is 350 kg / h (amount of cement produced of 1 ton) from the kiln bottom part of the rotary kiln of the cement kiln having a rotary kiln with NSP of 170 tons when used as an alternative fuel in the cement firing process. Per 2.1 kg). The chlorine content of this ASR was 2.2% by mass, and extraction was performed at an extraction rate of 2.0% with the chlorine bypass system installed in the cement firing step.
The operation results were as follows.
-ASR effectively acted as an alternative fuel for cement firing, and the coal used in the cement firing process could be reduced by 0.25 t / h.
-The chlorine concentration in the manufactured cement had a margin up to the standard value of 350 ppm for the chlorine concentration, and there was no problem in terms of quality.
・ The adhesion of the coating to the pre-heater was observed, but no effect was observed. In addition, there was no adverse effect on the operating conditions of other cement firing processes.
・ In the ASR transport process and storage process, component fluctuations due to segregation of fine particles and coarse particles that were problematic were not observed.
-A rake feeder was installed in the extraction section from the ASR input hopper. As a result, the ASR forming the entangled baby nodules was extracted while loosening with a rake feeder, so that it could be extracted smoothly.
３．まとめ
上記の実施例の結果にみられるように、５ｍｍ篩下質量比が３０％以下の廃自動車シュレッダーダストは、セメント焼成用の化石燃料の代替燃料として有効に用い得ると共に、セメント品質、セメント製造工程等への悪影響を防止することができる。
3. Summary As can be seen from the results of the above examples, waste car shredder dust having a 5 mm under-sieving mass ratio of 30% or less can be effectively used as an alternative to fossil fuels for cement burning, as well as cement quality and cement production. It is possible to prevent adverse effects on processes and the like.
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