JP6481961B2 - Waste gasification and melting apparatus and waste gasification and melting method - Google Patents

Waste gasification and melting apparatus and waste gasification and melting method Download PDF

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JP6481961B2
JP6481961B2 JP2015061575A JP2015061575A JP6481961B2 JP 6481961 B2 JP6481961 B2 JP 6481961B2 JP 2015061575 A JP2015061575 A JP 2015061575A JP 2015061575 A JP2015061575 A JP 2015061575A JP 6481961 B2 JP6481961 B2 JP 6481961B2
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furnace
main tuyere
air
waste
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堀内　聡
聡 堀内
奥山　契一
契一 奥山
昭夫 下村
昭夫 下村
肇 秋山
肇 秋山
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JFE Engineering Corp
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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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Description

本発明は、廃棄物を熱分解、ガス化、燃焼し、残留する灰分を溶融する廃棄物ガス化溶融装置及び廃棄物ガス化溶融方法に関する。   The present invention relates to a waste gasification and melting apparatus and a waste gasification and melting method for pyrolyzing, gasifying, and burning waste and melting residual ash.

都市ごみやシュレッダーダストなどの廃棄物を処理する技術として、廃棄物を熱分解、ガス化、燃焼して、残留する灰分を溶融しスラグにして排出する廃棄物ガス化溶融炉による廃棄物溶融処理が知られている。   Waste melting treatment using a waste gasification melting furnace that processes waste such as municipal waste and shredder dust by pyrolyzing, gasifying, and burning the waste to melt the remaining ash into slag It has been known.

この処理方法は、廃棄物を熱分解、ガス化することによりその熱量を回収することができるとともに、灰分を溶融してスラグとして排出した後に、埋立処分などで最終処分されるべき量を減容することができる利点を有している。このような溶融処理方法には幾つかの方式があるが、その一つとして、竪型をなすシャフト炉式の廃棄物ガス化溶融炉による方法がある。   This treatment method can recover the amount of heat by pyrolyzing and gasifying waste, and reducing the amount that should be finally disposed of in landfills after melting the ash and discharging it as slag. Has the advantage that can be. There are several methods for such melting treatment, and one of them is a method using a shaft furnace type waste gasification melting furnace having a vertical shape.

このシャフト炉式の廃棄物ガス化溶融炉は、例えば、炉下部に堆積させたコークスを燃焼させ、この高温のコークス床上へ廃棄物を投入して、熱分解、ガス化するとともに残留する灰分を溶融してスラグにする処理を行う炉である（特許文献１参照）。   This shaft furnace type waste gasification and melting furnace, for example, burns coke deposited in the lower part of the furnace, throws the waste on this high-temperature coke bed, pyrolyzes and gasifies it, and removes residual ash It is a furnace that performs a process of melting into slag (see Patent Document 1).

特許文献１のシャフト炉式の廃棄物ガス化溶融炉においては、竪型筒状をなす炉体の機能が大別して縦（上下）方向で３つの領域に区分される。すなわち、炉下部にコークスを堆積させたコークス充填層（高温燃焼帯）が形成され、このコークス充填層の上に廃棄物層が形成され、炉体の上部にて該廃棄物層の上方に大きな空間のフリーボード部をなしている。   In the shaft furnace type waste gasification and melting furnace of Patent Document 1, the functions of the vertical cylindrical furnace body are roughly divided into three regions in the vertical (vertical) direction. That is, a coke packed bed (high temperature combustion zone) in which coke is deposited at the lower part of the furnace is formed, a waste layer is formed on the coke packed bed, and a large portion is formed above the waste layer at the upper part of the furnace body. It is a free board part of the space.

かかる廃棄物ガス化溶融炉では、上記３つの領域のそれぞれでは酸素含有ガスの炉内への吹込みが行われる。炉下部におけるコークス充填層には主羽口が設けられていて、該主羽口に接続された送気管で酸素富化空気が炉内へ吹き込まれ、コークス充填層では投入されて堆積されたコークスが燃焼して、灰分を溶融する溶融熱源となっている。また、廃棄物層には副羽口が設けられ、空気が吹き込まれ、投入されて堆積された廃棄物を緩やかに流動させると共に、廃棄物を熱分解、部分酸化及びガス化させる。また、フリーボード部には三段羽口が設けられ、空気が吹き込まれ、廃棄物が熱分解されて生成した熱分解ガス（可燃性ガス）の一部を部分燃焼させて内部を所定温度に維持する。   In such a waste gasification and melting furnace, oxygen-containing gas is blown into the furnace in each of the three regions. The coke packed bed in the lower part of the furnace is provided with a main tuyere, and oxygen-enriched air is blown into the furnace through an air pipe connected to the main tuyere, and the coke packed bed is charged and deposited. Burns and becomes a heat source for melting ash. In addition, the waste layer is provided with a sub tuyere, air is blown in, and the waste deposited and flowed gently, and the waste is thermally decomposed, partially oxidized and gasified. In addition, the free board part is provided with a three-stage tuyere, air is blown in, and a part of the pyrolysis gas (combustible gas) generated by pyrolyzing the waste is partially burned to bring the inside to a predetermined temperature. maintain.

このようにシャフト炉式の廃棄物ガス化溶融炉は、一つの炉で、廃棄物をその炉内での降下に伴い熱分解ガス化処理と溶融処理の両方を行うことのできる設備である。投入された廃棄物は熱分解、ガス化され、ガスと灰分が生成される。主羽口からの酸素富化空気の送風によりコークス充填層のコークスが燃焼され高温燃焼帯が形成され、廃棄物の灰分が溶融されスラグとメタルとして排出される。コークス充填層はコークス同士間に生ずる空隙で、主羽口からの酸素富化空気やコークス燃焼により発生した高温ガスを通ガスさせるとともに、溶融したスラグとメタルを通液させる高温火格子としても機能している。コークス充填層のコークス燃焼により発生した高温ガスが、コークス充填層の上に形成された廃棄物層の廃棄物を加熱し、副羽口からの空気の送風により廃棄物は熱分解、ガス化され、この熱分解により発生した可燃性ガスを含むガスは廃棄物層内を上昇し、フリーボード部を経て、炉内上部に設けられた排出口より、炉外の二次燃焼室へ排出される。ガスは可燃ガスを多量に含んでいて二次燃焼室で燃焼され、ボイラで熱回収され蒸気を発生させその蒸気が発電等に用いられる。ボイラから排出されたガスは、サイクロンで比較的粗いダストが除去され、さらに、減温装置で冷却され、有害物質除去剤との反応により有害ガスが除去され、集塵機で除塵処理されるなど排ガス処理された後、煙突から大気に放散される。   As described above, the shaft furnace type waste gasification and melting furnace is a facility capable of performing both pyrolysis gasification treatment and melting treatment in one furnace as the waste falls in the furnace. The input waste is pyrolyzed and gasified to produce gas and ash. Coke in the coke packed bed is combusted by blowing oxygen-enriched air from the main tuyere to form a high-temperature combustion zone, and the ash content of the waste is melted and discharged as slag and metal. The coke packed bed is a void formed between cokes, and it functions as a high-temperature grate that allows oxygen-enriched air from the main tuyere and high-temperature gas generated by coke combustion to flow, and also allows molten slag and metal to flow. doing. The high-temperature gas generated by coke combustion in the coke packed bed heats the waste in the waste layer formed on the coke packed bed, and the waste is pyrolyzed and gasified by blowing air from the sub tuyere. The gas containing the combustible gas generated by this pyrolysis rises in the waste layer, and is discharged to the secondary combustion chamber outside the furnace through the free board portion and the discharge port provided in the upper part of the furnace. . The gas contains a large amount of combustible gas and is combusted in the secondary combustion chamber, and heat is recovered by the boiler to generate steam, which is used for power generation and the like. Exhaust gas treatment, such as removing relatively coarse dust with a cyclone, cooling with a temperature reducing device, removing harmful gas by reaction with a hazardous substance remover, and removing dust with a dust collector And then released from the chimney to the atmosphere.

特開平０９−０６０８３０JP 09-060830 A

かかる廃棄物ガス化溶融炉では、炉底部にコークスを堆積させたコークス充填層が形成され、コークスが燃焼して灰分の溶融熱源となっている。コークス充填層では供給される廃棄物の質の変動によりコークスの燃焼が不均一、不安定な状況になることがあり、廃棄物ガス化溶融炉の安定的な操業に支障が生じることがある。すなわち、コークス充填層に酸素富化空気を吹き込む主羽口先でコークス燃焼が不安定になり、温度低下が生じたり、燃焼残渣の溶融が不十分なため未溶融物が主羽口先に付着し閉塞ぎみになり酸素富化空気の送風圧が上昇するなど問題が生じる。   In such a waste gasification melting furnace, a coke packed bed in which coke is deposited at the bottom of the furnace is formed, and the coke burns to become a heat source for melting ash. In the coke packed bed, the coke combustion may become uneven and unstable due to fluctuations in the quality of the supplied waste, which may hinder the stable operation of the waste gasification and melting furnace. In other words, coke combustion becomes unstable at the main tuyere where oxygen-enriched air is blown into the coke packed bed, resulting in a temperature drop or insufficient melting of the combustion residue, so that unmelted material adheres to the main tuyere and becomes blocked. There is a problem that the air blowing pressure of oxygen-enriched air rises due to a gap.

従来はこのような問題発生時には送風する酸素富化空気の酸素濃度を高めたり、酸素富化空気供給量を増加させ、コークス燃焼を安定化して対応しているが、十分に改善できないことがある。   Conventionally, when such a problem occurs, the oxygen concentration of the oxygen-enriched air to be blown is increased or the oxygen-enriched air supply amount is increased to stabilize the coke combustion, but this may not be improved sufficiently. .

本発明は、このような事情に鑑み、主羽口先でのコークス燃焼を安定させ、温度低下と未溶融物の付着を防止することができる廃棄物ガス化溶融装置及び廃棄物ガス化溶融方法を提供することを課題とする。   In view of such circumstances, the present invention provides a waste gasification and melting apparatus and a waste gasification and melting method that can stabilize coke combustion at the main tuyere and prevent temperature drop and adhesion of unmelted material. The issue is to provide.

本発明によると、廃棄物ガス化溶融装置及び廃棄物ガス化溶融方法は、次のように構成される。   According to the present invention, the waste gasification and melting apparatus and the waste gasification and melting method are configured as follows.

＜廃棄物ガス化溶融装置＞
本発明の廃棄物ガス化溶融装置は、廃棄物を熱分解、ガス化、燃焼し、灰分を溶融する竪型の廃棄物ガス化溶融炉の上部に廃棄物の投入口、下部に溶融物の出滓口が設けられているとともに、該出滓口の上方位置に酸素含有気体を炉内へ吹き込む主羽口が設けられている廃棄物ガス化溶融装置において、主羽口は空気もしくは酸素富化空気を炉内へ吹き込む空気吹込管と、酸素を炉内へ吹き込む酸素吹込管とが設けられており、酸素吹込管が空気吹込管内に位置していることを特徴としている。 <Waste gasification and melting equipment>
The waste gasification and melting apparatus according to the present invention is a waste gasification and melting furnace that thermally decomposes, gasifies, and burns waste to melt ash, and a waste inlet at the top and a melt at the bottom. In a waste gasification and melting apparatus provided with a tap and a main tuyere that blows an oxygen-containing gas into the furnace at a position above the tap, the main tuyere is enriched with air or oxygen. An air blowing pipe for blowing the chemical air into the furnace and an oxygen blowing pipe for blowing oxygen into the furnace are provided, and the oxygen blowing pipe is located in the air blowing pipe.

本発明において、主羽口は廃棄物ガス化溶融炉の周方向で分布する複数位置に設けられており、複数の主羽口は、複数の主羽口群に別れていて、各主羽口群が選択的に異なる時期に酸素吹込管から酸素を吹き込むように設定されているようにすることができる。   In the present invention, the main tuyere is provided at a plurality of positions distributed in the circumferential direction of the waste gasification melting furnace, the plurality of main tuyere is divided into a plurality of main tuyere groups, and each main tuyere The group can be set to blow oxygen from the oxygen blowing pipe selectively at different times.

＜廃棄物ガス化溶融方法＞
本発明の廃棄物ガス化溶融方法は、廃棄物を熱分解、ガス化、燃焼し、灰分を溶融する竪型の廃棄物ガス化溶融炉の上部に設けられた投入口から廃棄物を投入し、下部に設けられた出滓口から溶融物を出滓するとともに、該出滓口の上方位置に設けられた主羽口から酸素含有気体を炉内へ吹き込む廃棄物ガス化溶融方法において、主羽口に設けられた空気吹込管から空気もしくは酸素富化空気を炉内へ吹き込むとともに、空気吹込管の内部に設けられた酸素吹込管から酸素を炉内へ吹き込むことを特徴としている。 <Waste gasification and melting method>
In the waste gasification and melting method of the present invention, the waste is pyrolyzed, gasified and combusted, and the waste is introduced from the inlet provided at the top of the vertical waste gasification and melting furnace which melts the ash. In the waste gasification and melting method in which the melt is discharged from the outlet provided in the lower part and oxygen-containing gas is blown into the furnace from the main tuyere provided above the outlet. Air or oxygen-enriched air is blown into the furnace from an air blowing pipe provided at the tuyere, and oxygen is blown into the furnace from an oxygen blowing pipe provided inside the air blowing pipe.

本発明において、主羽口は廃棄物ガス化溶融炉の周方向で分布する複数位置に設けられており、複数の主羽口は、複数の主羽口群に別れていて、各主羽口群が選択的に異なる時期に酸素吹込管から酸素を吹き込むようにすることができる。   In the present invention, the main tuyere is provided at a plurality of positions distributed in the circumferential direction of the waste gasification melting furnace, the plurality of main tuyere is divided into a plurality of main tuyere groups, and each main tuyere Oxygen can be blown from the oxygen blowing tube at times when the groups are selectively different.

このような本発明の装置そして方法にあっては、主羽口先端から空気もしくは酸素富化空気が空気吹出管から炉内へ吹き込まれるとともに、酸素が酸素吹込管から吹き込まれ、空気もしくは酸素富化空気に加え酸素によって主羽口先端近傍でのコークスの燃焼を促進させる。その結果、主羽口先端近傍でのコークス燃焼が不安定になることを防止して、主羽口先での温度低下と未溶融物の付着が防止される。   In such an apparatus and method of the present invention, air or oxygen-enriched air is blown from the air outlet tube into the furnace from the main tuyere tip, and oxygen is blown from the oxygen blowing tube. Coke combustion near the tip of the main tuyere is promoted by oxygen in addition to chemical air. As a result, the coke combustion near the tip of the main tuyere is prevented from becoming unstable, and the temperature drop at the main tuyere and the adhesion of unmelted material are prevented.

本発明において、上述の主羽口を周方向の複数位置に設け、複数の主羽口群として、各主羽口群を選択的に異なる時期に酸素吹込管から酸素を吹き込むようにすると、少ない酸素使用量でも周方向で均一なコークス燃焼が確保され、また、周方向で不均一な燃焼がある場合には、燃焼不良箇所に対応して位置する主羽口の酸素吹込管を選定して酸素を吹き込むことで周方向でコークス燃焼が均一となる。   In the present invention, the above-described main tuyere are provided at a plurality of positions in the circumferential direction, and as a plurality of main tuyere groups, each main tuyere group is selectively blown with oxygen from an oxygen blowing pipe at different times. Even if the amount of oxygen used is uniform, coke combustion is ensured in the circumferential direction, and if there is non-uniform combustion in the circumferential direction, select an oxygen blow-in pipe at the main tuyere located corresponding to the location of poor combustion. Blowing oxygen makes coke combustion uniform in the circumferential direction.

かくして、コークス燃焼が安定してかつ均一となり、周方向で均一に発生する高温の燃焼ガスは、コークス充填層を通過上昇して、廃棄物充填層を強熱し、均一かつ確実に熱分解が行われる。   Thus, coke combustion becomes stable and uniform, and the high-temperature combustion gas generated uniformly in the circumferential direction rises through the coke packed bed, ignites the waste packed bed, and performs uniform and reliable thermal decomposition. Is called.

このように、本発明は、主羽口に設けられた空気吹込管から空気もしくは酸素富化空気を炉内へ吹き込むとともに、空気吹込管の内部に設けられた酸素吹込管から酸素を炉内へ吹き込むことを特徴としたので、空気吹込管から吹き込まれる空気もしくは酸素富化空気に加え酸素吹込管から吹き込まれる酸素によって、主羽口先端近傍でのコークスの燃焼を促進させる結果、主羽口先端近傍でのコークス燃焼が不安定になることを防止して、コークス燃焼を安定化させて、主羽口先での温度低下と未溶融物の付着が防止されるという効果をもたらす。   Thus, the present invention blows air or oxygen-enriched air into the furnace from the air blowing pipe provided at the main tuyere, and oxygen into the furnace from the oxygen blowing pipe provided inside the air blowing pipe. Because it is characterized by the fact that it is blown, coke combustion near the tip of the main tuyere is promoted by the oxygen blown from the oxygen blowing tube in addition to the air blown from the air blowing tube or oxygen-enriched air. This prevents the coke combustion in the vicinity from becoming unstable, stabilizes the coke combustion, and brings about the effect of preventing the temperature drop at the tip of the main tuyere and the adhesion of unmelted material.

本発明の一実施形態としての廃棄物ガス化溶融装置の概要構成を示す図である。It is a figure which shows schematic structure of the waste gasification melting apparatus as one Embodiment of this invention. 図１装置における主羽口についての拡大断面図である。It is an expanded sectional view about the main tuyere in the FIG. 1 apparatus.

以下、添付図面にもとづき、本発明の実施形態を説明する。本実施形態の廃棄物ガス化溶融装置は、燃料としてコークスの供給を受け、廃棄物を熱分解、ガス化し、灰分を溶融するシャフト炉式の廃棄物ガス化溶融炉１の炉下部に設けられた主羽口から空気もしくは酸素富化空気と酸素を吹き込む点に特徴を有しているが、その特徴についての説明に先立ち、図１にもとづき、このシャフト炉式の廃棄物ガス化溶融炉１の概要構成を説明する。   Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. The waste gasification and melting apparatus of the present embodiment is provided at the lower part of a shaft furnace type waste gasification and melting furnace 1 that receives coke as fuel, pyrolyzes and gasifies waste, and melts ash. The shaft furnace type waste gasification melting furnace 1 is characterized in that air or oxygen-enriched air and oxygen are blown from the main tuyere, and prior to the description of the characteristics, this shaft furnace type waste gasification melting furnace 1 is shown in FIG. The outline structure of will be described.

＜シャフト炉式廃棄物ガス化溶融炉＞
図１に示される本発明の一実施形態で採用されているシャフト炉式の廃棄物ガス化溶融炉１には、該廃棄物ガス化溶融炉１の炉上部に、処理対象物としての廃棄物、燃料としてのコークス、スラグの成分調整材としての石灰石を炉内へ投入するための投入口２が設けられ、また、上部側方には炉内のガスを炉外へ排出するためのガス排出口３が設けられている。また、廃棄物ガス化溶融炉１の炉底部には溶融スラグと溶融金属を排出するための出滓口４が設けられている。 <Shaft furnace type waste gasification melting furnace>
A shaft furnace type waste gasification and melting furnace 1 employed in an embodiment of the present invention shown in FIG. 1 includes a waste as a processing object at the upper part of the waste gasification and melting furnace 1. In addition, an inlet 2 is provided for introducing coke as fuel and limestone as a component adjusting material for slag into the furnace, and a gas exhaust for discharging the gas in the furnace to the outside of the furnace is provided on the upper side. An outlet 3 is provided. In addition, an outlet 4 for discharging molten slag and molten metal is provided at the bottom of the waste gasification melting furnace 1.

廃棄物ガス化溶融炉１の上方には、都市ごみ等の廃棄物、コークス、生成するスラグの成分調整材として使用する石灰石をそれぞれ供給する供給装置（図示せず）が配設されており、この供給装置から供給された廃棄物、コークス、石灰石は搬送コンベア（図示せず
）により搬送され炉上部の上記投入口２から炉内に投入されるようになっている。 Above the waste gasification and melting furnace 1, a supply device (not shown) for supplying waste such as municipal waste, coke, and limestone used as a component adjusting material for slag to be generated is disposed. Waste, coke and limestone supplied from this supply device are transported by a transport conveyor (not shown) and fed into the furnace through the charging port 2 at the top of the furnace.

ガス排出口３には二次燃焼室１０が接続して設けられており、廃棄物を熱分解、ガス化して生成した可燃性ガスを燃焼する。該二次燃焼室１０は、二次燃焼のための空気を吹き込む空気送風口１１が設けられている。また、この二次燃焼室１０には、該二次燃焼室１０で可燃性ガスを燃焼した燃焼ガスから熱回収するボイラ１２が隣接して設けられている。   A secondary combustion chamber 10 is connected to the gas discharge port 3 and burns combustible gas generated by pyrolyzing and gasifying waste. The secondary combustion chamber 10 is provided with an air blowing port 11 for blowing air for secondary combustion. Further, the secondary combustion chamber 10 is provided with a boiler 12 adjacent to which heat is recovered from the combustion gas obtained by burning the combustible gas in the secondary combustion chamber 10.

上記シャフト炉式の廃棄物ガス化溶融炉１は、該廃棄物ガス化溶融炉１の内部空間が縦方向で４つの領域に区分されていて、下方から、コークス充填層Ａ、移動層Ｂ、ガス化層Ｃ、フリーボード部Ｄが形成される。   The shaft furnace type waste gasification and melting furnace 1 has an internal space of the waste gasification and melting furnace 1 divided into four regions in the vertical direction, and from below, a coke packed bed A, a moving bed B, A gasification layer C and a free board portion D are formed.

かかる廃棄物ガス化溶融炉１では、コークス充填層Ａ、ガス化層Ｃのそれぞれで、羽口が設けられ酸素含有ガスの炉内への吹込みが行われる。   In such a waste gasification and melting furnace 1, tuyere is provided in each of the coke packed bed A and the gasification bed C, and oxygen-containing gas is blown into the furnace.

炉下部におけるコークス充填層Ａには主羽口５が設けられ、酸素富化空気もしくは空気と酸素が吹き込まれる。ガス化層Ｃには副羽口６が設けられ、空気が吹き込まれる。   The main tuyere 5 is provided in the coke packed bed A in the lower part of the furnace, and oxygen-enriched air or air and oxygen are blown into the main tuyere. The gasification layer C is provided with a sub tuyere 6 and air is blown in.

＜主羽口＞
本実施形態では主羽口５から空気と酸素を吹き込む場合について説明するが、酸素富化空気と酸素を吹き込む場合も同様の形態である。主羽口５は、図２に見られるように、廃棄物ガス化溶融炉１の炉壁の内面側に取り付けられている羽口本体５Ｃにより先端部が保持されている空気吹込管５Ａと、該空気吹込管５Ａ内に配された酸素吹込管５Ｂとを有している。羽口本体５Ｃは外面がテーパ面をなしていて炉壁の対応孔部に強固に取り付けられている。該羽口本体５Ｃは内部に空気又は水等の冷媒を流通させて冷却されることが好ましい。 <Main tuyere>
Although the case where air and oxygen are blown from the main tuyere 5 will be described in the present embodiment, the case where oxygen-enriched air and oxygen are blown is the same. As shown in FIG. 2, the main tuyere 5 has an air blowing pipe 5 </ b> A whose tip is held by a tuyere main body 5 </ b> C attached to the inner surface side of the furnace wall of the waste gasification melting furnace 1, And an oxygen blowing pipe 5B disposed in the air blowing pipe 5A. The tuyere body 5C has a tapered outer surface and is firmly attached to a corresponding hole in the furnace wall. The tuyere body 5C is preferably cooled by circulating a refrigerant such as air or water.

本実施形態では、上記酸素吹込管５Ｂは空気吹込管５Ａの軸線Ｘ上に位置していて該空気吹込管５Ａと同心をなしているが、必ずしも軸線Ｘ上位置になくともよく、空気吹込管５Ａ内にあればよい。さらには、空気吹込管５Ａの軸線Ｘに対して直角な断面において管内に隔壁を設けて管内の一部を酸素吹込管５Ｂとしてもよい。かくして、空気吹込管５Ａからは空気（もしくは酸素富化空気）が炉内に吹き込まれ、酸素吹込管５Ｂからは酸素が炉内に吹き込まれる。空気吹込管５Ａそして酸素吹込管５Ｂは、炉外に設けられたそれぞれの弁により、流量の調整、供給時期の可変設定がなされるようになっている。   In the present embodiment, the oxygen blowing pipe 5B is located on the axis X of the air blowing pipe 5A and is concentric with the air blowing pipe 5A. However, the oxygen blowing pipe 5B does not necessarily have to be located on the axis X. It only has to be within 5A. Furthermore, a partition may be provided in the pipe in a cross section perpendicular to the axis X of the air blowing pipe 5A, and a part of the pipe may be used as the oxygen blowing pipe 5B. Thus, air (or oxygen-enriched air) is blown into the furnace from the air blowing pipe 5A, and oxygen is blown into the furnace from the oxygen blowing pipe 5B. The air blowing pipe 5A and the oxygen blowing pipe 5B are configured such that the flow rate is adjusted and the supply timing is variably set by respective valves provided outside the furnace.

このような空気吹込管５Ａそして酸素吹込管５Ｂを有する主羽口５は、廃棄物ガス化溶融炉１の周方向で複数位置に設けられている。複数の主羽口５は複数の主羽口５群を形成していて、各主羽口５群における空気吹込管５Ａが共通の空気供給管（図示せず）に接続されており、各主羽口５群における酸素吹込管５Ｂが共通の酸素供給管（図示せず）に接続されている。空気供給管そして酸素供給管にはそれぞれ流量調整、供給時期の可変設定のための弁が取り付けられている。例えば、主羽口５を廃棄物ガス化溶融炉１に対して、周方向で８箇所に設け、一つおきの４つの主羽口を第一主羽口群とし、他の４つを第二主羽口群として、それぞれの主羽口群における４つの空気吹込管が共通の空気供給管に接続され、４つの酸素吹込管が共通の酸素供給管に接続されているようにすることができる。   The main tuyere 5 having the air blowing pipe 5A and the oxygen blowing pipe 5B are provided at a plurality of positions in the circumferential direction of the waste gasification melting furnace 1. The plurality of main tuyere 5 forms a plurality of main tuyere 5 groups, and the air blowing pipe 5A in each main tuyere 5 group is connected to a common air supply pipe (not shown). The oxygen blowing pipe 5B in the tuyere 5 group is connected to a common oxygen supply pipe (not shown). The air supply pipe and the oxygen supply pipe are each equipped with a valve for adjusting the flow rate and variably setting the supply timing. For example, the main tuyere 5 is provided at eight locations in the circumferential direction with respect to the waste gasification melting furnace 1, every other four main tuyere is a first main tuyere group, and the other four are the first. As two main tuyere groups, four air blowing pipes in each main tuyere group are connected to a common air supply pipe, and four oxygen blowing pipes are connected to a common oxygen supply pipe. it can.

かくして、空気もしくは酸素富化空気については第一主羽口群そして第二主羽口群で常時吹き込み、第一主羽口群における酸素の吹込みと第二主羽口群における酸素の吹込みとを交互に行うようにすることができる。また、第一主羽口群における酸素吹き込み量の増加と空気もしくは酸素富化空気吹き込み量の減少操作と第二主羽口群における酸素吹き込み量の増加と空気もしくは酸素富化空気吹き込み量の減少操作を交互に行うようにすることもできる。また、酸素の吹込みを主羽口の選択により炉内の周方向でコークス燃焼が不安定になっている箇所のみに対して適宜行うように、あるいはコークス燃焼が不安定になっている箇所への酸素吹き込み量を多くするようにしてもよい。   Thus, air or oxygen-enriched air is always blown in the first main tuyere group and the second main tuyere group, oxygen blowing in the first main tuyere group and oxygen blowing in the second main tuyere group Can be performed alternately. In addition, an increase in the amount of oxygen blown in the first main tuyere group and a decrease in the amount of air or oxygen-enriched air blown up, an increase in the amount of oxygen blown in the second main tuyere group and a decrease in the amount of air or oxygen-enriched air blown It is also possible to perform the operation alternately. In addition, by selecting the main tuyere, oxygen can be appropriately injected only into the locations where the coke combustion is unstable in the circumferential direction of the furnace, or to the locations where the coke combustion is unstable. The amount of oxygen blown in may be increased.

このように構成される本実施形態装置では、廃棄物の廃棄物ガス化溶融処理は次の要領で行われる。   In the present embodiment configured as described above, waste gasification and melting treatment of waste is performed in the following manner.

＜廃棄物ガス化溶融炉でのガス化溶融方法＞
供給装置からの廃棄物、コークス、石灰石が廃棄物ガス化溶融炉１の上部に設けられた投入口２を経て、それぞれ所定量ずつ炉内へ投入され、特に、主羽口５からは、既述したように空気もしくは酸素富化空気と酸素が炉内へ吹き込まれ、副羽口６から空気が炉内へ吹き込まれる。 <Gas melting method in waste gasification melting furnace>
Waste, coke, and limestone from the supply device are respectively introduced into the furnace by a predetermined amount through the inlet 2 provided in the upper part of the waste gasification and melting furnace 1. As described above, air or oxygen-enriched air and oxygen are blown into the furnace, and air is blown into the furnace from the sub tuyere 6.

上記投入口２から投入された廃棄物は、炉内に堆積して廃棄物のガス化層Ｃを形成し、炉下部の移動層Ｂから上昇してくる高温の燃焼ガス及び副羽口６から吹き込まれる空気によって加熱され、乾燥され、次いで熱分解される。熱分解により生成した可燃性ガスを含む燃焼ガスは上昇し、可燃性ガスの一部がフリーボード部Ｄにて燃焼され、炉内部を所定温度に維持し、熱分解により発生した有害物とタール分を分解させる処理が施される。フリーボード部Ｄを通過したガスは炉上部に設けられたガス排出口３より、炉外の二次燃焼室１０へ排出される。ガスは可燃性ガスを多量に含んでいて二次燃焼室１０で空気送風口１１から空気を吹き込まれ燃焼され、ボイラ１２で燃焼ガスから熱回収され蒸気を発生させ、その蒸気が発電等に用いられる。ボイラ１２から排出された排ガスは、サイクロン（図示せず）で比較的粗いダストが除去され、さらに、減温装置（図示せず）で冷却され、有害物質除去剤との反応により有害ガスが除去され、集塵機（図示せず）で除塵処理されるなど排ガス処理された後、煙突（図示せず）から大気に放散される。   Waste introduced from the inlet 2 accumulates in the furnace to form a gasification layer C of waste, and from the high temperature combustion gas and the sub tuyere 6 rising from the moving bed B at the lower part of the furnace. It is heated by blown air, dried and then pyrolyzed. Combustion gas containing combustible gas generated by pyrolysis rises, a part of the combustible gas is combusted in freeboard part D, maintains the inside of the furnace at a predetermined temperature, and harmful substances and tar generated by pyrolysis Processing to decompose the minutes is performed. The gas that has passed through the free board part D is discharged from the gas discharge port 3 provided in the upper part of the furnace to the secondary combustion chamber 10 outside the furnace. The gas contains a large amount of combustible gas, and air is blown into the secondary combustion chamber 10 through the air blowing port 11 and burned, and heat is recovered from the combustion gas in the boiler 12 to generate steam, which is used for power generation and the like. It is done. The exhaust gas discharged from the boiler 12 is removed with relatively coarse dust by a cyclone (not shown), further cooled by a temperature reducing device (not shown), and the harmful gas is removed by reaction with a harmful substance removing agent. Then, after exhaust gas treatment such as dust removal with a dust collector (not shown), it is emitted from the chimney (not shown) to the atmosphere.

ガス化層Ｃで廃棄物は熱分解されてガスが生成され、さらに、熱分解により生じた固定炭素や灰分は、コークス及び石灰石とともに下降し移動層Ｂを形成する。移動層Ｂでは、コークス充填層Ａから上昇してくる高温のガスにより下降するこれらの固体の昇温が行われると同時に、高温のＣＯ２ガスにより廃棄物の熱分解により生じた固定炭素がガス化される。コークス充填層Ａでは主羽口５から吹き込まれる空気もしくは酸素富化空気と酸素によりコークスとガス化されずに残った廃棄物の固定炭素が燃焼され、この燃焼熱により廃棄物の灰分が溶融され溶融スラグと溶融メタルが生成される。石灰石は灰分が溶融されたスラグの性状を好ましいものとする調整材として働く。さらに、発生した高温の燃焼ガスが上昇し廃棄物の熱分解のために加熱する熱源となる。 The waste is thermally decomposed in the gasification layer C to generate gas, and the fixed carbon and ash generated by the thermal decomposition descend together with the coke and limestone to form the moving layer B. In the moving bed B, the solids that are lowered by the high-temperature gas rising from the coke packed bed A are heated, and at the same time, the fixed carbon generated by the pyrolysis of the waste by the high-temperature CO 2 gas is gas. It becomes. In the coke packed bed A, fixed carbon of the waste that remains without being gasified with coke is burned by the air blown from the main tuyere 5 or oxygen-enriched air and oxygen, and the ash content of the waste is melted by this combustion heat. Molten slag and molten metal are produced. Limestone works as a conditioner that makes the slag melted with ash preferable. Further, the generated high-temperature combustion gas rises and becomes a heat source for heating for thermal decomposition of the waste.

主羽口５から下方の炉下部では、高温になりながらも燃え尽きていないコークスがコークス塊同士の間隙を保持して充填された状態でコークス充填層Ａを形成しており、溶融スラグと溶融メタルはコークス塊同士の間隙を滴下し炉底に達する。溶融スラグと溶融メタルは炉底に達するまでに均質化され性状が安定化され、炉底に設けられた出滓口４から排出され、炉外に設けられた水砕装置（図示せず）に供給され冷却固化され、冷却固化された水砕スラグと水砕金属が回収される。主羽口５から送風される空気もしくは酸素富化空気と酸素、コークスと固定炭素の燃焼により発生した高温の燃焼ガスとは、コークス充填層Ａから移動層Ｂを通過しガス化層Ｃへ上昇して廃棄物を加熱し、ガス化層Ｃの廃棄物が副羽口６から供給される空気により部分酸化、熱分解、ガス化される。コークス充填層Ａでは、コークス、燃料ガスが燃焼して灰分溶融と廃棄物熱分解の熱源となり、コークスが塊同士の間隙を保持して酸素富化空気と高温の燃焼ガスとを通気させ、溶融スラグと溶融メタルとを通液させる高温火格子の機能を有している。   In the lower part of the furnace below the main tuyere 5, coke packed bed A is formed in a state in which coke which is high in temperature but not burned out is filled while maintaining a gap between the coke lumps. Molten slag and molten metal Drops the gap between coke lumps and reaches the bottom of the furnace. The molten slag and molten metal are homogenized by the time they reach the bottom of the furnace, their properties are stabilized, discharged from the tap 4 provided at the bottom of the furnace, and supplied to a water granulator (not shown) provided outside the furnace. The supplied granulated slag and granulated metal are recovered by cooling and solidifying. Air blown from the main tuyere 5 or oxygen-enriched air and high-temperature combustion gas generated by combustion of oxygen, coke and fixed carbon rise from the coke packed bed A to the gasified bed C through the moving bed B Then, the waste is heated, and the waste of the gasification layer C is partially oxidized, pyrolyzed, and gasified by the air supplied from the sub tuyere 6. In the coke packed bed A, coke and fuel gas are burned to become a heat source for ash melting and waste pyrolysis, and the coke keeps the gaps between the lumps and ventilates the oxygen-enriched air and the high-temperature combustion gas to melt It has the function of a high-temperature grate that allows slag and molten metal to flow.

＜主羽口からの空気もしくは酸素富化空気と酸素の吹込み＞
上述したように、主羽口５では、空気吹込管５Ａから空気もしくは酸素富化空気が吹き込まれ、酸素吹込管５Ｂから酸素が吹き込まれる。このように、空気もしくは酸化富化空気に加え酸素をも吹き込み、コークスの燃焼を促進し、コークス燃焼が不安定になることを防止し、主羽口先温度を上げて主羽口先における未溶融物の付着そして温度低下を防止する。コークスの燃焼により生じた高温の燃焼ガスは、コークス充填層Ａを上昇通過後、移動層Ｂ、ガス化層Ｃへ達し、廃棄物を均一かつ確実に熱分解する。また、複数の主羽口は、主羽口ごとに吹込み対応が可能なため、主羽口先状況の良い主羽口の状況を悪化させることはない。 <Air blown from the main tuyere or oxygen-enriched air and oxygen>
As described above, in the main tuyere 5, air or oxygen-enriched air is blown from the air blowing pipe 5A, and oxygen is blown from the oxygen blowing pipe 5B. In this way, in addition to air or oxygen-enriched air, oxygen is also blown to promote the combustion of coke, preventing instability of coke combustion, raising the temperature of the main tuyere, and unmelted material at the main tuyere Prevents adhesion and temperature drop. The high-temperature combustion gas generated by the combustion of the coke passes through the coke packed bed A and reaches the moving bed B and the gasification bed C, and thermally decomposes the waste uniformly and reliably. In addition, since the plurality of main tuyere can be blown in for each main tuyere, the situation of the main tuyere with good main tuyere tip conditions is not deteriorated.

本発明において、酸素吹込管５Ｂから炉内へ吹き込む酸素の流速は、超音速であることが好ましい。このため、２５℃程度の常温であれば酸素の流速を３５０ｍ／ｓｅｃ以上とし、酸素温度が１℃上昇するにつれ流速を０．６ｍ／ｓｅｃ増加させ、酸素温度に対応して酸素流速を超音速とするように、主羽口の口径、酸素流量等を設定する。このように炉内に吹き込む酸素流速を超音速とすることにより、炉下部での酸素送風を均一化することができる。また、酸素吹込管５Ｂを空気吹込管５Ａ内に配設しているため、吹き込まれた酸素流の周囲に空気流もしくは酸化富化空気流が形成されているので、酸素の過剰供給による局所的高温域の発生を抑制することができる。   In the present invention, the flow rate of oxygen blown from the oxygen blowing tube 5B into the furnace is preferably supersonic. For this reason, if the room temperature is about 25 ° C., the flow rate of oxygen is 350 m / sec or more, the flow rate is increased by 0.6 m / sec as the oxygen temperature increases by 1 ° C., and the oxygen flow rate is supersonic corresponding to the oxygen temperature. The diameter of the main tuyere, the oxygen flow rate, and the like are set as follows. By making the oxygen flow rate blown into the furnace in this way supersonic, the oxygen blowing at the lower part of the furnace can be made uniform. In addition, since the oxygen blowing pipe 5B is disposed in the air blowing pipe 5A, an air flow or an oxidation-enriched air flow is formed around the blown oxygen flow, so that a local oxygen supply due to excessive supply of oxygen occurs. Generation of a high temperature region can be suppressed.

廃棄物ガス化溶融炉１の周方向の複数位置に設けられている主羽口５は、それぞれ個別に空気もしくは酸素富化空気そして酸素の吹込み流量の調整、吹込み時期の選定を可能として、周方向での燃焼不安定箇所の発生に対応できる。また、既述のように、複数の主羽口が複数の主羽口群に別れていて、各主羽口群が選択的に異なる時期に酸素吹込管から酸素を吹き込むように設定され、複数の主羽口群として各主羽口群ごとに吹込み時期をずらし、あるいは交互に吹き込むように操業を行ってもよい。こうすることで、過不足のない流量での酸素を吹き込むことで、コークス燃焼が不安定になることを防止し、主羽口先温度を上げて主羽口での未溶融物の付着や温度低下が防止される。   The main tuyere 5 provided at a plurality of positions in the circumferential direction of the waste gasification and melting furnace 1 can individually adjust the flow rate of air or oxygen-enriched air and oxygen and select the timing of blowing. This can cope with the occurrence of unstable combustion points in the circumferential direction. In addition, as described above, a plurality of main tuyere is divided into a plurality of main tuyere groups, and each main tuyere group is set to inject oxygen from the oxygen blowing pipe at different times, As the main tuyere group, the operation may be performed so that the blowing time is shifted for each main tuyere group or alternately. By doing this, oxygen is blown at a flow rate that is not excessive or deficient, preventing instability of coke combustion, increasing the temperature of the main tuyere, and adhesion of unmelted material at the main tuyere and temperature reduction Is prevented.

複数の主羽口群のうちの各主羽口群ごとに吹込み時期をずらす操業の例として、空気もしくは酸素富化空気については第一主羽口群そして第二主羽口群で常時吹き込み、第一主羽口群における酸素の吹込みと第二主羽口群における酸素の吹込みとを交互に行うようにすることができる。また、第一主羽口群における酸素吹き込み量の増加と空気もしくは酸素富化空気吹き込み量の減少操作と第二主羽口群における酸素吹き込み量の増加と空気もしくは酸素富化空気吹き込み量の減少操作を交互に行うようにすることもできる。酸素吹き込み量の増加と、空気もしくは酸素富化空気吹き込み量の減少を行う操作では、空気もしくは酸素富化空気の吹き込みにより供給される酸素量と酸素吹き込みにより供給される酸素量の総和を所定範囲内とする操業を行うことができる。また、酸素の吹込みを主羽口又は主羽口群の選択により炉内の周方向でコークス燃焼が不安定になっている箇所のみに対して適宜行うように、あるいはコークス燃焼が不安定になっている箇所への酸素吹き込み量を多くするようにしてもよい。   As an example of operation that shifts the blowing time for each main tuyere group among multiple main tuyere groups, air or oxygen-enriched air is always blown in the first main tuyere group and the second main tuyere group The oxygen blowing in the first main tuyere group and the oxygen blowing in the second main tuyere group can be performed alternately. In addition, an increase in the amount of oxygen blown in the first main tuyere group and a decrease in the amount of air or oxygen-enriched air blown in, and an increase in the amount of oxygen blown in the second main tuyere group and a decrease in the amount of air or oxygen-enriched air blown It is also possible to perform the operation alternately. For operations that increase the amount of oxygen blowing and decrease the amount of air or oxygen-enriched air blowing, the total amount of oxygen supplied by blowing air or oxygen-enriched air and the amount of oxygen supplied by blowing oxygen is within a specified range. It is possible to carry out operations within. In addition, oxygen can be blown as appropriate only to locations where the coke combustion is unstable in the circumferential direction of the furnace by selecting the main tuyere or main tuyere group, or the coke combustion is unstable. You may make it increase the amount of oxygen blowing to the location.

１ 廃棄物ガス化溶融炉
２ 投入口
４ 出滓口
５ 主羽口
５Ａ 空気吹込管
５Ｂ 酸素吹込管 1 Waste Gasification Melting Furnace 2 Input 4 Depot 5 Main tuyere 5A Air Blow 5B Oxygen Blow

Claims (4)

廃棄物を熱分解、ガス化、燃焼し、残留する灰分を溶融する竪型の廃棄物ガス化溶融炉の上部に廃棄物の投入口、下部に溶融物の出滓口が設けられているとともに、該出滓口の上方位置に酸素含有気体を炉内へ吹き込む主羽口が設けられている廃棄物ガス化溶融装置において、
主羽口は空気もしくは酸素富化空気を炉内へ吹き込む空気吹込管と、空気吹込管内に位置し酸素を炉内へ吹き込む酸素吹込管とが設けられており、
さらに、主羽口は廃棄物ガス化溶融炉の周方向の複数位置に設けられ、周方向で一つおきの主羽口からなる第一主羽口群と、他の主羽口からなる第二主羽口群とに別れていて、空気もしくは酸素富化空気を全ての主羽口で常時吹き込み、第一主羽口群における酸素の吹込みと第二主羽口群における酸素の吹込みとを交互に行うように設定されていることを特徴とする廃棄物ガス化溶融装置。 A waste-type waste gasification melting furnace that pyrolyzes, gasifies, and burns waste and melts the remaining ash is provided with a waste inlet at the top and a melt outlet at the bottom. In a waste gasification and melting apparatus provided with a main tuyere for blowing an oxygen-containing gas into the furnace at a position above the tap hole,
The main tuyere is provided with an air blowing pipe for blowing air or oxygen-enriched air into the furnace, and an oxygen blowing pipe located in the air blowing pipe for blowing oxygen into the furnace.
Furthermore, the main tuyere is provided at a plurality of positions in the circumferential direction of the waste gasification melting furnace, and the first main tuyere group consisting of every other main tuyere in the circumferential direction and the first main tuyere consisting of the other main tuyere. Separated into two main tuyere groups, air or oxygen-enriched air is constantly blown into all main tuyere, oxygen blowing in the first main tuyere group and oxygen blowing in the second main tuyere group And a waste gasification and melting device, wherein the waste gasification and melting device is set to perform alternately. 燃料としてコークスの供給を受け廃棄物を熱分解、ガス化、燃焼し、残留する灰分を溶融する竪型の廃棄物ガス化溶融炉の上部に廃棄物の投入口、下部に溶融物の出滓口が設けられているとともに、該出滓口の上方位置に酸素含有気体を炉内へ吹き込む主羽口が設けられている廃棄物ガス化溶融装置において、
主羽口は空気もしくは酸素富化空気を炉内へ吹き込む空気吹込管と、空気吹込管内に位置し酸素を炉内へ吹き込む酸素吹込管とが設けられており、
さらに、主羽口は廃棄物ガス化溶融炉の周方向の複数位置に設けられ、空気もしくは酸素富化空気を全ての主羽口で常時吹き込み、炉内の周方向でコークス燃焼が不安定になっている箇所に対応する主羽口で酸素の吹込み、又は酸素吹込み量の増加操作を行うように設定されていることを特徴とする廃棄物ガス化溶融装置。 Coke is supplied as fuel, and the waste is pyrolyzed, gasified, burned, and the residual ash is melted to melt the remaining ash. In the waste gasification and melting apparatus provided with a main tuyere that is provided with a mouth and blows an oxygen-containing gas into the furnace at a position above the tap hole,
The main tuyere is provided with an air blowing pipe for blowing air or oxygen-enriched air into the furnace, and an oxygen blowing pipe located in the air blowing pipe for blowing oxygen into the furnace.
In addition, the main tuyere is provided at multiple positions in the circumferential direction of the waste gasification and melting furnace, and air or oxygen-enriched air is constantly blown into all the main tuyere, making the coke combustion unstable in the circumferential direction of the furnace. A waste gasification and melting apparatus, which is set to perform an operation of injecting oxygen or increasing the amount of oxygen injected at a main tuyere corresponding to a portion that is formed. 廃棄物を熱分解、ガス化、燃焼し、残留する灰分を溶融する竪型の廃棄物ガス化溶融炉の上部に設けられた投入口から廃棄物を投入し、下部に設けられた出滓口から溶融物を出滓するとともに、該出滓口の上方位置に設けられた主羽口から酸素含有気体を炉内へ吹き込む廃棄物ガス化溶融方法において、
主羽口に設けられた空気吹込管から空気もしくは酸素富化空気を炉内へ吹き込むとともに、空気吹込管の内部に設けられた酸素吹込管から酸素を炉内へ吹き込み、
主羽口は廃棄物ガス化溶融炉の周方向の複数位置に設けられ、周方向で一つおきの主羽口からなる第一主羽口群と、他の主羽口からなる第二主羽口群とに別れていて、空気もしくは酸素富化空気を全ての主羽口で常時吹き込み、第一主羽口群における酸素の吹込みと第二主羽口群における酸素の吹込みとを交互に行うことを特徴とする廃棄物ガス化溶融方法。 Waste is injected from the inlet provided in the upper part of the vertical waste gasification melting furnace that pyrolyzes, gasifies and burns waste and melts the remaining ash, and the outlet provided in the lower part In the waste gasification melting method in which the molten material is discharged from the outlet and oxygen-containing gas is blown into the furnace from the main tuyere provided above the outlet.
While blowing air or oxygen-enriched air into the furnace from the air blowing pipe provided at the main tuyere, oxygen is blown into the furnace from the oxygen blowing pipe provided inside the air blowing pipe,
The main tuyere is provided at multiple positions in the circumferential direction of the waste gasification and melting furnace, and the first main tuyere group consisting of every other main tuyere in the circumferential direction and the second main tuyere consisting of other main tuyere Separated from the tuyere group, air or oxygen-enriched air is constantly blown into all the main tuyere, and oxygen blowing in the first main tuyere group and oxygen blowing in the second main tuyere group A waste gasification and melting method characterized by being alternately performed. 燃料としてコークスの供給を受け廃棄物を熱分解、ガス化、燃焼し、残留する灰分を溶融する竪型の廃棄物ガス化溶融炉の上部に設けられた投入口から廃棄物を投入し、下部に設けられた出滓口から溶融物を出滓するとともに、該出滓口の上方位置に設けられた主羽口から酸素含有気体を炉内へ吹き込む廃棄物ガス化溶融方法において、
主羽口に設けられた空気吹込管から空気もしくは酸素富化空気を炉内へ吹き込むとともに、空気吹込管の内部に設けられた酸素吹込管から酸素を炉内へ吹き込み、
さらに、主羽口は廃棄物ガス化溶融炉の周方向の複数位置に設けられ、空気もしくは酸素富化空気を全ての主羽口で常時吹き込み、炉内の周方向でコークス燃焼が不安定になっている箇所に対応する主羽口で酸素の吹込み、又は酸素吹込み量の増加操作を行うことを特徴とする廃棄物ガス化溶融方法。
Coke is supplied as fuel, and the waste is pyrolyzed, gasified, burned, and the waste is injected from the inlet provided at the top of the vertical waste gasification melting furnace that melts the remaining ash. In the waste gasification and melting method in which the molten material is discharged from the outlet provided in the furnace, and oxygen-containing gas is blown into the furnace from the main tuyere provided above the outlet,
While blowing air or oxygen-enriched air into the furnace from the air blowing pipe provided at the main tuyere, oxygen is blown into the furnace from the oxygen blowing pipe provided inside the air blowing pipe,
In addition, the main tuyere is provided at multiple positions in the circumferential direction of the waste gasification and melting furnace, and air or oxygen-enriched air is constantly blown into all the main tuyere, making the coke combustion unstable in the circumferential direction of the furnace. A waste gasification and melting method, characterized in that oxygen is blown in at a main tuyere corresponding to a portion that is located, or an operation for increasing the amount of oxygen blow is performed.
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