JP5207474B2 - How to use resin waste - Google Patents

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JP5207474B2
JP5207474B2 JP2009073066A JP2009073066A JP5207474B2 JP 5207474 B2 JP5207474 B2 JP 5207474B2 JP 2009073066 A JP2009073066 A JP 2009073066A JP 2009073066 A JP2009073066 A JP 2009073066A JP 5207474 B2 JP5207474 B2 JP 5207474B2
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resin
kiln
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polyamide
waste plastic
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慶展 辰巳
紳一郎 齋藤
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Taiheiyo Cement Corp
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    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B7/00Hydraulic cements
    • C04B7/36Manufacture of hydraulic cements in general
    • C04B7/43Heat treatment, e.g. precalcining, burning, melting; Cooling
    • C04B7/44Burning; Melting
    • C04B7/4407Treatment 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
    • C04B7/4423Waste or refuse used as fuel
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P40/00Technologies relating to the processing of minerals
    • Y02P40/10Production of cement, e.g. improving or optimising the production methods; Cement grinding
    • Y02P40/125Fuels from renewable energy sources, e.g. waste or biomass

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  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Description

本発明は、樹脂系廃棄物の利用方法に関し、特に、樹脂系廃棄物をセメント焼成用の燃料として利用しながら、セメント焼成工程において効率よくNOxを低減する方法に関する。   The present invention relates to a method for utilizing resinous waste, and more particularly, to a method for efficiently reducing NOx in a cement firing step while using resinous waste as a fuel for cement firing.

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窒素酸化物(以下「NOx」という)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、環境への関心の高まりや、NOx規制の導入等により、より効率よくNOxを低減する技術が望まれている。   The exhaust gas of the cement kiln contains nitrogen oxides (hereinafter referred to as “NOx”) due to the high temperature range of the firing zone. When the concentration of NOx is high, a denitration agent such as urea or ammonia is added, The NOx concentration is reduced by the reducing action by combustion in the calciner. However, there is a demand for a technique for reducing NOx more efficiently by increasing interest in the environment and introducing NOx regulations.

そこで、特許文献1には、NOxを含む排気ガスに、廃プラスチック等の窒素を含有する可燃性廃棄物等を導入し、この可燃性廃棄物の酸化熱分解反応によって生成する水素化窒素によりNOxを選択的還元反応させることで、アンモニアや尿素よりも安価で、下水汚泥又は焼酎廃液よりも多量に使用可能な上記可燃性廃棄物を脱硝剤として使用して排気ガス中のNOxを低減する方法が開示されている。   Therefore, in Patent Document 1, combustible waste containing nitrogen such as waste plastic is introduced into exhaust gas containing NOx, and NOx is generated by nitrogen hydride generated by the oxidative pyrolysis reaction of the combustible waste. Of reducing NOx in exhaust gas by using the above flammable waste as a denitration agent, which is cheaper than ammonia and urea and can be used in a larger amount than sewage sludge or shochu waste liquid Is disclosed.

また、特許文献2には、有機性廃棄物をガス化して還元性ガスを生成し、該還元性ガスをセメント焼成装置に投入してNOxの還元剤として利用することで、尿素やアンモニア等の脱硝剤を用いることなく、廃プラスチック等の有機性廃棄物を利用しながら、還元性ガスとNOxとの反応を迅速に行い、脱硝効率を向上させることが提案されている。   Further, in Patent Document 2, organic waste is gasified to generate a reducing gas, and the reducing gas is introduced into a cement baking apparatus and used as a reducing agent for NOx. It has been proposed to improve the denitration efficiency by rapidly reacting the reducing gas with NOx while using organic waste such as waste plastic without using a denitration agent.

特開2004−298707号公報JP 2004-298707 A 特開2008−018371号公報JP 2008-018371 A

上述のように、従来、廃プラスチック等の廃棄物をセメント焼成工程において燃料、及びNOxを低減するための還元剤としてとして利用することが提案されているが、種々の対策を講じても、実際のセメント製造装置においては、アンモニアや尿素等の高価な脱硝剤を添加せざるを得ないのが現状であり、改善の余地があった。   As described above, it has been proposed to use waste such as waste plastic as a fuel and a reducing agent for reducing NOx in the cement firing process. However, even if various measures are taken, In the present cement manufacturing apparatus, an expensive denitration agent such as ammonia or urea has to be added, and there is room for improvement.

そこで、本発明は、廃プラスチック等の樹脂系廃棄物をセメント焼成用の燃料として利用しながら、セメント焼成工程においてより効率よくNOxを低減することを課題とする。   Then, this invention makes it a subject to reduce NOx more efficiently in a cement baking process, utilizing resin-type wastes, such as a waste plastic, as a fuel for cement baking.

上記課題を解決するため、本発明者らは、鋭意研究を重ねた結果、従来、セメント工場に受け入れた樹脂系廃棄物を、主にその大きさによる燃焼のし易さの観点からセメント製造装置における利用位置を選定していた現状を見直し、樹脂系廃棄物には、アンモニアや尿素を生ずるものがあることなどに着目し、樹脂系廃棄物の種類に基づいてセメント製造装置における利用位置を選定することにより、上記課題を解決することができることを見出し、本発明をなすに至った。   In order to solve the above-mentioned problems, the present inventors have conducted intensive research, and as a result, conventionally, resin-based waste received in cement factories is mainly used in terms of ease of combustion due to its size. Reviewing the current situation of selecting the use position in Japan, focusing on the fact that some resin wastes produce ammonia and urea, etc., and selecting the use position in cement production equipment based on the type of resin waste As a result, the inventors have found that the above problems can be solved, and have made the present invention.

すなわち、本発明は、樹脂系廃棄物の利用方法であって、ポリアミド系樹脂又は/及びユリア樹脂を50質量%以上含む廃プラスチックをセメントキルンの窯尻部又は/及び仮焼炉に投入し、ポリアミド系樹脂及びユリア樹脂以外の樹脂を90質量%以上含む廃プラスチックをセメントキルンの窯前バーナーより吹き込むことを特徴とする。   That is, the present invention is a method for utilizing resinous waste, and waste plastic containing 50% by mass or more of polyamide-based resin and / or urea resin is put into a kiln bottom of a cement kiln or / and a calcining furnace, Waste plastic containing 90% by mass or more of a resin other than polyamide resin and urea resin is blown from a burner in front of a kiln of a cement kiln.

本発明によれば、ポリアミド系樹脂又は/及びユリア樹脂を50質量%以上含む廃プラスチックをセメントキルンの窯尻部又は/及び仮焼炉に投入して燃焼させると、ポリアミド系樹脂からはアンモニアが発生し、ユリア樹脂からは尿素が発生する。これらアンモニア及び尿素は、800〜1000℃程度の燃焼ガスに混合させることで無触媒脱硝剤として機能するため、樹脂の種類によって利用位置を選定しない従来に比較して、無触媒脱硝剤としてのアンモニア及び尿素の消費量を削減することができる。   According to the present invention, when waste plastic containing 50% by mass or more of polyamide-based resin and / or urea resin is put into a kiln bottom of a cement kiln or / and a calcining furnace and burned, ammonia is emitted from the polyamide-based resin. And urea is generated from the urea resin. Since these ammonia and urea function as a non-catalytic denitration agent when mixed with a combustion gas of about 800 to 1000 ° C., ammonia as a non-catalytic denitration agent is not used depending on the type of resin. And the consumption of urea can be reduced.

また、本発明は、樹脂系廃棄物の利用方法であって、受け入れた樹脂系廃棄物をポリアミド系樹脂又は/及びユリア樹脂を含む廃プラスチックと、ポリアミド系樹脂及びユリア樹脂以外の廃プラスチックとに分別し、分別したポリアミド系樹脂又は/及びユリア樹脂を50質量%以上含む廃プラスチックをセメントキルンの窯尻部又は/及び仮焼炉に投入し、分別したポリアミド系樹脂及びユリア樹脂以外の樹脂を90質量%以上含む廃プラスチックをセメントキルンの窯前バーナーより吹き込むことを特徴とする。本発明によれば、受け入れた種々の樹脂系廃棄物から、ポリアミド系樹脂又は/及びユリア樹脂を含む廃プラスチックと、ポリアミド系樹脂及びユリア樹脂以外の廃プラスチックとに分別することで、樹脂系廃棄物毎にセメント製造装置における好適な位置で利用することができる。   The present invention is also a method for using resinous waste, wherein the received resinous waste is converted into waste plastic containing polyamide resin or / and urea resin, and waste plastic other than polyamide resin and urea resin. Waste plastic containing 50% by mass or more of the sorted polyamide resin and / or urea resin is put into a kiln bottom of a cement kiln or / and a calcining furnace, and a resin other than the sorted polyamide resin and urea resin is placed. Waste plastic containing 90% by mass or more is blown from a burner in front of a kiln of a cement kiln. According to the present invention, resin-based waste is separated from various received resin-based wastes into waste plastic containing polyamide-based resin or / and urea resin and waste plastic other than polyamide-based resin and urea resin. It can utilize in the suitable position in a cement manufacturing apparatus for every thing.

上記樹脂系廃棄物の利用方法において、前記ポリアミド系樹脂又は/及びユリア樹脂を50質量%以上含む廃プラスチックを破砕し、5mm以上50mm以下に粒度調整してセメントキルンの窯尻部又は/及び仮焼炉に投入することができる。これにより、投入位置での廃プラスチックの分解速度を高め、無触媒脱硝反応の適正温度内でのアンモニア及び尿素放出量が増加し、より効果的にNOxを低減することができる。   In the above-mentioned method of using resin waste, waste plastic containing 50% by mass or more of the polyamide resin and / or urea resin is crushed, and the particle size is adjusted to 5 mm or more and 50 mm or less, and the kiln bottom of a cement kiln or / and temporary Can be put into a kiln. As a result, the decomposition rate of the waste plastic at the charging position is increased, the amount of ammonia and urea released within the appropriate temperature for the non-catalytic denitration reaction is increased, and NOx can be reduced more effectively.

また、上記樹脂系廃棄物の利用方法において、前記ポリアミド系樹脂及びユリア樹脂以外の樹脂を90質量%以上含む廃プラスチックを破砕し、3mm以上20mm以下に粒度調整してセメントキルンの窯前バーナーより吹き込むことができる。これにより、セメントキルン内での着地燃焼を防止しながら、燃料として効果的に利用することが可能となる。   Further, in the above method of using resin waste, waste plastic containing 90% by mass or more of a resin other than the polyamide resin and urea resin is crushed, and the particle size is adjusted to 3 mm or more and 20 mm or less from a burner before the kiln of a cement kiln. Can be blown. This makes it possible to effectively use the fuel while preventing landing combustion in the cement kiln.

以上のように、本発明によれば、廃プラスチック等の樹脂系廃棄物をセメント焼成用の燃料として利用しながら、セメント焼成工程においてより効率よくNOxを低減することができる。   As described above, according to the present invention, NOx can be more efficiently reduced in the cement firing step while using resin waste such as waste plastic as a fuel for cement firing.

本発明にかかる樹脂系廃棄物の利用方法を説明するためのフローチャートである。It is a flowchart for demonstrating the utilization method of the resin waste concerning this invention.

次に、本発明を実施するための形態を図面を参照しながら詳細に説明する。   Next, embodiments for carrying out the present invention will be described in detail with reference to the drawings.

図1は、本発明にかかる方法を用いて樹脂系廃棄物を利用するセメント焼成装置の一例を示し、このセメント焼成装置1は、プレヒータ2と、仮焼炉3と、セメントキルン4と、クリンカクーラー5等からなる。   FIG. 1 shows an example of a cement baking apparatus that uses resin waste using the method according to the present invention. The cement baking apparatus 1 includes a preheater 2, a calcining furnace 3, a cement kiln 4, and a clinker. Consists of a cooler 5 and the like.

プレヒータ2は、仮焼炉3からの高温ガスによって原料を予熱するため、複数のサイクロン2a〜2dを多段に備え、各々のサイクロン間、3段目サイクロン2bと仮焼炉3との間及び最下段サイクロン2aとセメントキルン4との間には、原料シュート7〜11が設けられ、最上段サイクロン2dから排出された排ガスを系外に排出するための主排気風車6が配置される。   Since the preheater 2 preheats the raw material with the high-temperature gas from the calcining furnace 3, the preheater 2 includes a plurality of cyclones 2a to 2d in multiple stages, between each cyclone, between the third-stage cyclone 2b and the calcining furnace 3, and at the top. Raw material chutes 7 to 11 are provided between the lower cyclone 2a and the cement kiln 4, and a main exhaust wind turbine 6 for discharging exhaust gas discharged from the uppermost cyclone 2d to the outside of the system is disposed.

仮焼炉3は、プレヒータ2によって予熱された原料を仮焼するため、微粉炭を吹き込むバーナ3aを備え、仮焼炉3には、クーラー抽気ダクト12を介してクリンカクーラー5からの抽気が導入される。また、仮焼炉3は、ライジングダクト13を介してセメントキルン4に接続される。   The calcining furnace 3 is provided with a burner 3a for blowing pulverized coal in order to calcine the raw material preheated by the preheater 2, and the calcining furnace 3 is introduced with bleed air from the clinker cooler 5 via the cooler bleed duct 12. Is done. The calcining furnace 3 is connected to the cement kiln 4 via the rising duct 13.

セメントキルン4は、仮焼炉3によって仮焼された原料を焼成してセメントクリンカーを生成するため、微粉炭を吹き込むバーナ4aを備える。クリンカクーラー5は、上記のようにして焼成されたクリンカーを冷却するため、セメントキルン4の下流側に配置される。   The cement kiln 4 includes a burner 4a into which pulverized coal is blown in order to produce a cement clinker by firing the raw material calcined by the calcining furnace 3. The clinker cooler 5 is disposed on the downstream side of the cement kiln 4 in order to cool the clinker fired as described above.

上記セメント焼成装置1において、セメントキルン4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。   In the cement baking apparatus 1, the exhaust gas of the cement kiln 4 contains NOx resulting from the high temperature region of the firing zone. When the concentration of NOx is high, a denitration agent such as urea or ammonia is added, or temporary The NOx concentration is reduced by the reducing action by combustion in the furnace.

そこで、本発明では、ポリアミド系樹脂又はユリア樹脂、あるいはこれらの両方を含む廃棄物(以下、「ポリアミド系樹脂等を含む廃プラ」という)を窯尻部14又は仮焼炉3、あるいはこれらの両方に投入する一方、ポリアミド系樹脂及びユリア樹脂を含まないその他樹脂を含む廃棄物(以下、「その他の樹脂を含む廃プラ」という)を、セメントキルン4の窯前部15よりバーナー用燃料として吹き込む。尚、窯尻部14とは、セメントキルン4のうち、原料の流れ方向上流側の部位であり、窯前部15とは、セメントキルン4のうち、原料の流れ方向下流側の部位であって、原料を焼成するためのバーナ4aが設置される部位をいう。   Therefore, in the present invention, a polyamide resin or a urea resin, or a waste containing both of them (hereinafter referred to as “waste plastic containing a polyamide resin or the like”) is used as the kiln bottom 14 or the calcining furnace 3, or these While being put into both, waste containing polyamide resin and other resin not containing urea resin (hereinafter referred to as “waste plastic containing other resin”) is used as burner fuel from the kiln front part 15 of the cement kiln 4. Infuse. The kiln bottom part 14 is a part of the cement kiln 4 on the upstream side in the raw material flow direction, and the kiln front part 15 is a part of the cement kiln 4 on the downstream side of the raw material flow direction. The part where the burner 4a for firing the raw material is installed.

具体的には、ポリアミド系樹脂等を50質量%以上含む廃プラをバーナ3a、又は別途設けたバーナから仮焼炉3に吹き込んでもよく、窯尻部14にノズル等を介して投入したり、開閉可能な投入口を窯尻部14に設けて直接窯尻部14内に投入することもできる。一方、その他の樹脂を含む廃プラは、セメントキルン4のバーナ4a又は別途設けたバーナからセメントキルン4内に吹き込むことができる。   Specifically, waste plastic containing 50% by mass or more of polyamide-based resin or the like may be blown into the calciner 3 from the burner 3a or a separately provided burner, and is thrown into the kiln bottom 14 via a nozzle or the like, It is also possible to provide an openable / closable inlet in the kiln butt part 14 and directly enter the kiln butt part 14. On the other hand, waste plastic containing other resins can be blown into the cement kiln 4 from the burner 4a of the cement kiln 4 or a separately provided burner.

表1は、各種有機材料を燃焼させた際に発生する燃焼ガスの組成を比で表したものであって、700℃、空気量100L/hrで燃焼させた場合を示す(プラスチックマテリアルVol、Jan.1977に掲載)。   Table 1 shows the composition of the combustion gas generated when various organic materials are combusted as a ratio, and shows a case where the combusted gas is combusted at 700 ° C. and an air amount of 100 L / hr (Plastic Materials Vol, Jan). Posted in .1977).

Figure 0005207474
Figure 0005207474

同表から、ナイロン66、ポリアクリル酸アミド等のポリアミド系樹脂は、燃焼によりアンモニアを発生することが判る。また、尿素を原料とするユリア樹脂は、熱分解により尿素が生ずる。   From the table, it can be seen that polyamide resins such as nylon 66 and polyacrylic amide generate ammonia by combustion. In addition, urea is produced from urea by heat decomposition.

そこで、上記ポリアミド系樹脂等を50質量%以上含む廃プラを窯尻部14等に投入することで、この廃プラが窯尻部14及びその下流側において燃焼し、ポリアミド系樹脂からはアンモニアが発生し、ユリア樹脂からは尿素が発生する。これらを、窯尻部14及びその下流側における800〜1000℃程度の領域でセメントキルン4の燃焼ガスに混合させることで、アンモニア及び尿素が無触媒脱硝剤として機能し、セメントキルン4の排ガスに含まれるNOx濃度を低下させることができる。   Therefore, by throwing waste plastic containing 50% by mass or more of the polyamide resin into the kiln bottom 14 and the like, the waste plastic burns in the kiln bottom 14 and its downstream side, and ammonia is emitted from the polyamide resin. And urea is generated from the urea resin. By mixing these with the combustion gas of the cement kiln 4 in the kiln bottom part 14 and in the region of about 800 to 1000 ° C. on the downstream side thereof, ammonia and urea function as a non-catalytic denitration agent. The contained NOx concentration can be reduced.

一方、その他の樹脂を90質量%以上含む廃プラは、無触媒脱硝剤として機能することがないため、セメントキルン4のバーナ4a等からセメントキルン4内に吹き込まれて1450℃に達する高温化で燃焼し、効率的に熱エネルギーを回収することができる。   On the other hand, waste plastic containing 90% by mass or more of other resins does not function as a non-catalytic denitration agent. Therefore, the waste plastic is blown into the cement kiln 4 from the burner 4a of the cement kiln 4 and is heated to 1450 ° C. It can burn and efficiently recover thermal energy.

上記ポリアミド系樹脂等を含む廃プラ及びその他の樹脂を含む廃プラを投入する前に、これらを予め破砕し、粒度調整することもできる。   Prior to the introduction of the waste plastic containing the polyamide-based resin and the like and the waste plastic containing other resins, they can be crushed in advance and the particle size can be adjusted.

ポリアミド系樹脂等を50質量%以上含む廃プラは、破砕し粒度調整することで、分解速度が早くなり、無触媒脱硝反応の適正温度内でのアンモニア及び尿素放出量が増加し、効率的に無触媒脱硝剤として機能することができ、粒径を5mm以上50mm以下に調整して窯尻部14等に投入することができる。粒径が5mm未満の場合には、破砕処理量が減少して動力源単位が増加するため好ましくなく、50mmを超えると分解速度が遅くなり、プレヒーター上部の無触媒脱硝反応の適正温度外にてアンモニア及び尿素を放出するため、反応効率が低下するという不具合がある。   Waste plastic containing 50% by mass or more of polyamide-based resin, etc. is crushed and adjusted in particle size, so that the decomposition rate becomes faster, and the amount of ammonia and urea released within the appropriate temperature for non-catalytic denitration reaction increases. It can function as a non-catalytic denitration agent, and the particle size can be adjusted to 5 mm or more and 50 mm or less and can be put into the kiln bottom 14 or the like. When the particle size is less than 5 mm, the amount of crushing treatment decreases and the power source unit increases, which is not preferable. When the particle size exceeds 50 mm, the decomposition rate decreases, and the temperature exceeds the appropriate temperature for the non-catalytic denitration reaction above the preheater. As a result, ammonia and urea are released, so that the reaction efficiency is lowered.

また、その他の樹脂を90質量%以上を含む廃プラは、破砕して粒度調整することで、燃焼速度が微粉炭並となり、粒径を3mm以上20mm以下に調整することでセメントキルン4よりバーナー用主燃料として吹き込むことができる。粒径が3mm未満の場合には、破砕に要する動力が過大であるため好ましくなく、20mmを超えると、セメントキルン4内での着地燃焼によってセメントクリンカの色調に悪影響を及ぼす虞がある。   In addition, waste plastic containing 90% by mass or more of other resins is crushed to adjust the particle size, so that the burning speed becomes the same as that of pulverized coal, and the particle size is adjusted to 3 mm or more and 20 mm or less to burner than cement kiln 4. Can be injected as main fuel. If the particle size is less than 3 mm, the power required for crushing is excessive, which is not preferable. If the particle size exceeds 20 mm, the color tone of the cement clinker may be adversely affected by landing combustion in the cement kiln 4.

尚、セメント焼成装置1を備えたセメント工場には、多種の樹脂系廃棄物が搬入されるため、受け入れた樹脂系廃棄物をポリアミド系樹脂等を含む廃プラと、その他の樹脂を含む廃プラとに、赤外線分光法を用いて分別して用いることが好ましい。勿論、ポリアミド系樹脂等を含む廃プラと、その他の樹脂を含む廃プラとが混在せずにセメント工場に搬入される場合には、置場を別々に設けて管理すれば、容易に樹脂の種類に応じた利用が可能となる。   In addition, since various resin wastes are carried into the cement factory equipped with the cement firing apparatus 1, the received resin wastes are waste plastics including polyamide resins and waste plastics including other resins. In addition, it is preferable to use by separating using infrared spectroscopy. Of course, when waste plastics containing polyamide-based resin, etc. and waste plastics containing other resins are brought into a cement factory without being mixed, the type of resin can be easily determined by providing separate storage locations. Can be used according to

次に、本発明にかかる樹脂系廃棄物の利用方法の実施例として、セメント製造工場において、ポリアミド系樹脂等を含む廃プラと、ポリアミド以外の樹脂を含む廃プラを各々5mm以上20mm以下、20mm以上35mm以下、35mm以上50mm以下、50mm以上に粒度調整後、これを(ロータリーフィーダにより計量し、ルーツブロアで圧送して)窯尻に連続的に投入した。投入量は2t/h、3t/h、4t/h、5t/hとした。   Next, as an example of a method for using resinous waste according to the present invention, in a cement manufacturing plant, waste plastic containing polyamide-based resin and the like and waste plastic containing resin other than polyamide are 5 mm or more and 20 mm or less, 20 mm, respectively. After adjusting the particle size to 35 mm or less, 35 mm or more and 50 mm or less, or 50 mm or more, this was continuously put into the kiln bottom (weighed with a rotary feeder and pumped with a roots blower). The input amount was 2 t / h, 3 t / h, 4 t / h, and 5 t / h.

脱硝剤投入前、脱硝剤として尿素を一定量投入後、及びポリアミド系樹脂等を含む廃プラ、ポリアミド以外の樹脂を含む廃プラ投入後の各々でプレヒーター出口のNOxを測定した。ここで、脱硝剤(尿素)投入後のNOx濃度低減効果を100として、各々のポリアミド系樹脂を含む廃プラとポリアミド以外の樹脂を含む廃プラのNOx濃度低減効果(脱硝効果)を比較した。尚、排ガスNOxの測定は、JIS−B−7982に基づく化学発光方式により行った。   The NOx at the preheater outlet was measured before the denitration agent was charged, after a certain amount of urea was added as a denitration agent, and after the waste plastic containing polyamide-based resin and the like and waste plastic containing resin other than polyamide were charged. Here, assuming that the NOx concentration reduction effect after adding the denitration agent (urea) is 100, the NOx concentration reduction effect (denitration effect) of waste plastic containing each polyamide resin and waste plastic containing resin other than polyamide was compared. The exhaust gas NOx was measured by a chemiluminescence method based on JIS-B-7982.

Figure 0005207474
Figure 0005207474

以上のように、ポリアミド系樹脂等を含む廃プラを窯尻部(又は仮焼炉)に投入することで、樹脂の種類によって利用位置を選定しない従来に比較して、無媒脱硝効果が得られることが判る。また、粒度を小さく調整することにより、脱硝効果が向上することが判る。   As described above, by introducing waste plastic containing polyamide-based resin into the kiln bottom (or calcining furnace), a solventless denitration effect can be obtained compared to the conventional case where the use position is not selected depending on the type of resin. You can see that Moreover, it turns out that the denitration effect improves by adjusting a particle size small.

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 3段目サイクロン
2c 2段目サイクロン
2d 最上段サイクロン
3 仮焼炉
4 セメントキルン
4a バーナ
5 クリンカクーラー
6 主排気風車
7〜11 原料シュート
12 クーラー抽気ダクト
13 ライジングダクト
14 窯尻部
15 窯前部
DESCRIPTION OF SYMBOLS 1 Cement baking apparatus 2 Preheater 2a Lowermost cyclone 2b 3rd stage cyclone 2c 2nd stage cyclone 2d Uppermost cyclone 3 Calciner 4 Cement kiln 4a Burner 5 Clinker cooler 6 Main exhaust wind turbine 7-11 Raw material chute 12 Cooler bleed duct 13 Rising duct 14 Kiln bottom 15 Kiln front

Claims (4)

ポリアミド系樹脂又は/及びユリア樹脂を50質量%以上含む廃プラスチックをセメントキルンの窯尻部又は/及び仮焼炉に投入し、ポリアミド系樹脂及びユリア樹脂以外の樹脂を90質量%以上含む廃プラスチックをセメントキルンの窯前バーナーより吹き込むことを特徴とする樹脂系廃棄物の利用方法。   Waste plastic containing 50% by mass or more of polyamide-based resin and / or urea resin is placed in the kiln bottom of a cement kiln or / and calcining furnace, and waste plastic containing 90% by mass or more of resin other than polyamide-based resin and urea resin A method for using resinous waste, characterized by blowing in through a kiln in front of a kiln in a cement kiln. 受け入れた樹脂系廃棄物をポリアミド系樹脂又は/及びユリア樹脂を含む廃プラスチックと、ポリアミド系樹脂及びユリア樹脂以外の廃プラスチックとに分別し、分別したポリアミド系樹脂又は/及びユリア樹脂を50質量%以上含む廃プラスチックをセメントキルンの窯尻部又は/及び仮焼炉に投入し、分別したポリアミド系樹脂及びユリア樹脂以外の樹脂を90質量%以上含む廃プラスチックをセメントキルンの窯前バーナーより吹き込むことを特徴とする樹脂系廃棄物の利用方法。   The received resin waste is separated into waste plastic containing polyamide resin or / and urea resin and waste plastic other than polyamide resin and urea resin, and 50% by mass of the sorted polyamide resin or / and urea resin. The waste plastic containing the above is put into the kiln bottom of the cement kiln or / and the calcining furnace, and the waste plastic containing 90% by mass or more of the resin other than the sorted polyamide resin and urea resin is blown from the burner before the kiln of the cement kiln. Use method of resin waste characterized by this. 前記ポリアミド系樹脂又は/及びユリア樹脂を50質量%以上含む廃プラスチックを破砕し、5mm以上50mm以下に粒度調整してセメントキルンの窯尻部又は/及び仮焼炉に投入することを特徴とする請求項1又は2に記載の樹脂系廃棄物の利用方法。   Waste plastic containing 50% by mass or more of the polyamide-based resin and / or urea resin is crushed, adjusted to a particle size of 5 mm or more and 50 mm or less, and charged into a kiln bottom of a cement kiln or / and a calcining furnace. The utilization method of the resin waste of Claim 1 or 2. 前記ポリアミド系樹脂及びユリア樹脂以外の樹脂を90質量%以上含む廃プラスチックを破砕し、3mm以上20mm以下に粒度調整してセメントキルンの窯前バーナーより吹き込むことを特徴とする請求項1又は2に記載の樹脂系廃棄物の利用方法。   The waste plastic containing 90% by mass or more of a resin other than the polyamide-based resin and urea resin is crushed, adjusted to a particle size of 3 mm or more and 20 mm or less, and blown from a burner in front of a kiln of a cement kiln. Use of the resinous waste described.
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