JP4753744B2 - Organic waste treatment methods - Google Patents
Organic waste treatment methods Download PDFInfo
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- JP4753744B2 JP4753744B2 JP2006051835A JP2006051835A JP4753744B2 JP 4753744 B2 JP4753744 B2 JP 4753744B2 JP 2006051835 A JP2006051835 A JP 2006051835A JP 2006051835 A JP2006051835 A JP 2006051835A JP 4753744 B2 JP4753744 B2 JP 4753744B2
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- 239000010815 organic waste Substances 0.000 title claims description 20
- 238000000034 method Methods 0.000 title claims description 7
- 238000000197 pyrolysis Methods 0.000 claims description 46
- 239000007789 gas Substances 0.000 claims description 38
- 238000002407 reforming Methods 0.000 claims description 24
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 21
- 229910052799 carbon Inorganic materials 0.000 claims description 21
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 11
- 239000001301 oxygen Substances 0.000 claims description 11
- 229910052760 oxygen Inorganic materials 0.000 claims description 11
- 238000002156 mixing Methods 0.000 claims description 4
- 238000002309 gasification Methods 0.000 description 29
- 239000002699 waste material Substances 0.000 description 17
- 238000010248 power generation Methods 0.000 description 8
- 238000006243 chemical reaction Methods 0.000 description 4
- 239000000446 fuel Substances 0.000 description 4
- 238000003672 processing method Methods 0.000 description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 3
- 229910002091 carbon monoxide Inorganic materials 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 239000004576 sand Substances 0.000 description 3
- 239000002916 wood waste Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000003763 carbonization Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 239000002737 fuel gas Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 150000001247 metal acetylides Chemical class 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000010801 sewage sludge Substances 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
-
- 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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/20—Waste processing or separation
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- Processing Of Solid Wastes (AREA)
- Coke Industry (AREA)
Description
本発明は、有機性廃棄物をガス化炉でガス化し、このガスで発電して所内電力を得るとともに、炭素分を含む熱分解残渣を回収することが可能な、有機性廃棄物の処理方法に関するものである。 The present invention is a method for treating organic waste, which is capable of gasifying organic waste in a gasification furnace, generating electric power with this gas to obtain on-site power, and recovering pyrolysis residues containing carbon. It is about.
従来から、ごみ等の廃棄物を処理するにあたり、最終処分場（埋立地）の延命化を図るために、焼却やガス化炉等により廃棄物の減量化が図られている。一方、最近では地球温暖化ガス（ＣＯ２）の削減の要請から、ごみ等の廃棄物を単純に焼却処理するのではなく、特許文献１に示すような、ガス化炉で得られる回収燃料ガスを利用して発電を可能とするガス化発電システムが提案されている。このガス化発電システムは、図２に示すように、木質廃棄物等の高発熱量廃棄物を、流動床式ガス化炉５１で、５００℃〜９００℃でガス化し、発生した熱分解ガス、タール、熱分解残渣の全量を改質炉５２で約９００℃〜１２００℃の雰囲気で酸素と反応させて改質し、得られた燃料ガスをガスエンジン５３等で発電機５４を駆動させて発電する技術である。このガス化発電システムで得られた電力は、流動床式ガス化炉５１等の廃棄物処分場内部に利用する他に、余剰分を外部に売電もしくは他の設備に送電していた。
Conventionally, when processing waste such as garbage, in order to extend the life of the final disposal site (landfill), the amount of waste has been reduced by incineration or gasification furnaces. On the other hand, recently, due to a request for reduction of global warming gas (CO 2 ), instead of simply incinerating wastes and other wastes, the recovered fuel gas obtained in the gasification furnace as shown in Patent Document 1 There has been proposed a gasification power generation system that makes it possible to generate power by using the power. As shown in FIG. 2, this gasification power generation system gasifies high calorific value waste such as wood waste at 500 ° C. to 900 ° C. in a fluidized
しかしながら、このガス化発電システムでは、廃棄物を流動床式ガス化炉５１で発生した熱分解ガス、タール、熱分解残渣の全量を改質炉５２に供給していたため、この熱分解残渣に含まれる灰分が溶融し、改質炉５２内部にクリンカが生成する問題があった。
However, in this gasification power generation system, the entire amount of pyrolysis gas, tar, and pyrolysis residue generated in the fluidized
また、木質廃棄物は、発生場所が分散しているため、木質廃棄物の輸送費や輸送のために使われるエネルギー等を考慮すると、小規模分散型のガス化発電システムが有効とされているが、発電量が少ないことから、発電量から廃棄物処分場の系内で使用する所内電力を差し引くと、外部に送電できる余剰電力量は少なく、売電しても売電施設の設備費を回収できるだけの利益は得られず、売電施設を建設するのに使うエネルギーを回収するのは難しかった。 In addition, the location where wood waste is generated is dispersed. Therefore, considering the transportation cost of wood waste and the energy used for transportation, a small-scale distributed gasification power generation system is effective. However, because the power generation amount is small, subtracting the on-site power used in the waste disposal site from the power generation amount reduces the amount of surplus power that can be transmitted to the outside. There was no profit to recover, and it was difficult to recover the energy used to build a power selling facility.
一方、特許文献２に示すように、廃棄物を熱分解し、炭化物を製造する炭化システムがある。しかし、この炭化システムは、炭化物の製造を目的とするものであり、外部から電力を供給する必要があった。そこで、炭素分を含む熱分解残渣を回収しつつ、廃棄物処分場の系内で使用する、必要分の所内電力のみを発電して、電力や補助燃料等のエネルギー利用がシステム内で完結し、自立型で効率の良い廃棄物処分設備の開発が要望されていた。
本発明は上記のような問題点を解決して、改質炉内部でのクリンカの生成を回避しつつ、必要分の所内電力を発電し、炭素分を含む熱分解残渣を回収することができる有機性廃棄物の処理方法を提供することを目的として完成されたものである。 The present invention solves the above-mentioned problems and can generate the necessary in-house power and recover the pyrolysis residue containing carbon while avoiding the generation of clinker inside the reforming furnace. It was completed for the purpose of providing a method for treating organic waste.
上記課題を解決するためになされた本発明は、有機性廃棄物を流動床式のガス化炉に投入して、空気比１以下の低酸素雰囲気下で熱分解ガス、タール、炭素分を含む熱分解残渣に熱分解し、ガス化炉の後段に設けたサイクロン装置で熱分解残渣を除去するとともに、タール及び熱分解ガスを、サイクロン装置の後段に設けた改質炉に供給して改質ガスを生成し、その改質ガスを発電機のエネルギー源として利用する有機性廃棄物の処理方法において、
前記ガス化炉の温度及び酸素比を調整して制御することにより、熱分解残渣に含まれる炭素量と改質ガスに含まれる炭素量の配合比率を調整し、前記発電機で必要分の所内電力のみを得つつ、前記サイクロン装置で炭化物を含む熱分解残渣を回収することを特徴とする。
In order to solve the above problems, the present invention is made by introducing organic waste into a fluidized bed gasification furnace and containing pyrolysis gas, tar, and carbon content in a low oxygen atmosphere with an air ratio of 1 or less. Pyrolysis residue is pyrolyzed, and the pyrolysis residue is removed by a cyclone device provided at the latter stage of the gasification furnace, and tar and pyrolysis gas are supplied to the reforming furnace provided at the latter stage of the cyclone device for reforming In an organic waste processing method that generates gas and uses the reformed gas as an energy source for a generator,
By adjusting and controlling the temperature and oxygen ratio of the gasifier, the mixing ratio of the carbon amount contained in the pyrolysis residue and the carbon amount contained in the reformed gas is adjusted, While obtaining only electric power, the cyclone apparatus collects pyrolysis residues containing carbides.
本発明の有機性廃棄物の処理方法によれば、炭素分を含む熱分解残渣を回収するサイクロン装置をガス化炉の後段に設け、前記ガス化炉の温度及び酸素比を調整して制御することにより、熱分解残渣に含まれる炭素量と改質ガスに含まれる炭素量の配合比率を調整することにしたので、必要分の所内電力のみを発電しつつ、炭化物を含む熱分解残渣として回収することが可能となる。 According to the organic waste processing method of the present invention, a cyclone device for recovering a pyrolysis residue containing carbon is provided at the rear stage of the gasification furnace, and the temperature and oxygen ratio of the gasification furnace are adjusted and controlled. As a result, it was decided to adjust the blending ratio between the amount of carbon contained in the pyrolysis residue and the amount of carbon contained in the reformed gas, so that only the necessary in-house power was generated and recovered as a pyrolysis residue containing carbide. It becomes possible to do.
また、サイクロン装置で灰分を含む熱分解残渣を回収することとしたので、改質炉でクリンカの生成を防ぐことが可能となり、改質炉でのクリンカトラブルを解消することが可能となる。 Further, since the pyrolysis residue containing ash is collected by the cyclone apparatus, it becomes possible to prevent the production of clinker in the reforming furnace, and to solve the clinker trouble in the reforming furnace.
以下に、図面を参照しつつ本発明の好ましい実施の形態を示す。
図１は本発明の実施の形態を示す有機性廃棄物の処理方法の説明図である。図１において、１はホッパー、２はフィーダ、３は流動床式のガス化炉、４はブロア、５はサイクロン装置、６は改質炉、７はガスエンジン、８は発電機である。有機性廃棄物はガス化炉３で熱分解され、サイクロン装置５で熱分解残渣を回収した後に、改質炉６で改質ガスに改質し、ガスエンジン７に使用して発電機８で発電する。以下に本発明の詳細を説明する。
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is an explanatory diagram of an organic waste processing method according to an embodiment of the present invention. In FIG. 1, 1 is a hopper, 2 is a feeder, 3 is a fluidized bed gasification furnace, 4 is a blower, 5 is a cyclone device, 6 is a reforming furnace, 7 is a gas engine, and 8 is a generator. The organic waste is thermally decomposed in the gasification furnace 3, and after the pyrolysis residue is collected in the cyclone device 5, the organic waste is reformed into reformed gas in the reforming
木質廃棄物等の有機性廃棄物はホッパー１から、フィーダ２により流動床式のガス化炉３に投入される。このガス化炉３の内部は空気比を１以下の還元雰囲気に保たれている。ブロア４でガス化炉３内に空気を送給し、流動媒体砂aを撹拌する。廃棄物はガス化炉３内で、流動媒体砂ａとともに流動、撹拌されながら部分燃焼し、熱分解反応が行われ、可燃性の熱分解ガス、タール、炭素分を含む熱分解残渣に分解される。熱分解反応を行う際に、ガス化炉３の内部の温度は５００℃〜９００℃であることが好ましい。なお、流動床式のガス化炉は循環流動床炉、気泡流動床炉いずれも適用可能である。
Organic waste such as woody waste is fed from a hopper 1 into a fluidized bed gasifier 3 by a
ガス化炉３で生成された熱分解ガス、タール、熱分解残渣はガス化炉３上部から、ガス化炉３の後段に設けられたサイクロン装置５に送られ、遠心力の作用により熱分解残渣が分離され、炭素分を含む熱分解残渣を回収することができる。このサイクロン装置５で得られた炭素分を含む熱分解残渣は、製鉄のための還元剤や保温材、融雪剤として、また搬出可能な熱源として有効利用することができる。 The pyrolysis gas, tar, and pyrolysis residue generated in the gasification furnace 3 are sent from the upper part of the gasification furnace 3 to a cyclone device 5 provided at the rear stage of the gasification furnace 3, and the pyrolysis residue is produced by the action of centrifugal force. Can be separated, and the pyrolysis residue containing carbon can be recovered. The pyrolysis residue containing carbon content obtained by the cyclone device 5 can be effectively used as a reducing agent, a heat insulating material, a snow melting agent for iron making, and a heat source that can be carried out.
灰分を含む熱分解残渣をサイクロン装置５で回収することとしたので、改質炉６には熱分解残渣が除去された状態で、熱分解ガスとタールのみを供給することができ、改質炉６内部でクリンカが生成することがなく、このクリンカ生成による改質炉６のトラブルを防止することができ、またクリンカを除去する手間を省くことが可能となる。
Since the pyrolysis residue containing ash is recovered by the cyclone device 5, only the pyrolysis gas and tar can be supplied to the reforming
熱分解ガス及びタールは、約９００℃〜１２００℃に保たれた改質炉６に供給され、酸素と水蒸気により改質される。改質炉６の内部で進む反応は下記の通りである。なお、下式中のＣｘＨｙは熱分解ガスとタールである。
・ＣｘＨｙ+（ｘ+ｙ/４）Ｏ2＝ｘＣＯ2+ｙ/２・Ｈ2Ｏ………(１)
・ＣｘＨｙ+ｘＨ2Ｏ＝（ｘ+ｙ/2）Ｈ2+ｘＣＯ………………(２)
The pyrolysis gas and tar are supplied to the reforming
CxHy + (x + y / 4) O 2 = xCO 2 + y / 2 H 2 O (1)
· CxHy + xH 2 O = ( x + y / 2) H 2 + xCO .................. (2)
熱分解ガスと酸素との(1)の反応による燃焼熱は、改質炉６の熱源として利用される。タール及び熱分解ガス（ＣｘＨｙ）は、改質炉６中で熱により、水蒸気（Ｈ2Ｏ）と反応し、水素（Ｈ2）と一酸化炭素（ＣＯ）を主成分とする改質ガスになる。（(２)の反応）タールと熱分解ガスが最適に改質されるために、改質炉６の温度と酸素比を調整する。
The combustion heat generated by the reaction (1) between the pyrolysis gas and oxygen is used as a heat source for the reforming
改質炉６で生成された改質ガスは、発電機８を駆動するガスエンジン７に供給され、発電機８のエネルギー源として利用される。発電された電力は、本発明の有機性廃棄物の処理方法に使用される。この電力は、例えばフィーダ２、ガス化炉３、ブロア４、サイクロン装置５、改質炉６等に使用される。なお、発電機８を駆動する動力源としては、ガスエンジン７の代わりに、ガスタービンや、ボイラーと蒸気タービンの組み合わせ等により、発電機８を駆動させることとしてもよく、改質ガスは、これらガスタービン、ボイラー等の燃料としても使われることとしてもよい。また、改質ガスはガス化炉３や改質炉６の燃料などのエネルギー源として使用することもできる。
The reformed gas generated in the reforming
ガス化炉３の運転条件（温度、酸素比）を調整すると、サイクロン装置５で回収される熱分解残渣に含まれる炭素量が変化する。そこで、ガス化炉３の温度及び酸素比を制御して、熱分解残渣に含まれる炭素量と改質ガスに含まれる炭素量の配合比率を調整することにより、必要分の所内電力を発電することとした。表１に前記運転条件を変化させた結果の１例を示す。 When the operating conditions (temperature, oxygen ratio) of the gasification furnace 3 are adjusted, the amount of carbon contained in the pyrolysis residue recovered by the cyclone device 5 changes. Therefore, by controlling the temperature and oxygen ratio of the gasification furnace 3 and adjusting the mixing ratio of the amount of carbon contained in the pyrolysis residue and the amount of carbon contained in the reformed gas, the necessary amount of in-house power is generated. It was decided. Table 1 shows an example of the result of changing the operating conditions.
表１から明らかなように、ガス化炉３の温度を５００℃とすると（運転条件１）、サイクロン装置５で回収される熱分解残渣に含まれる炭素分は５０％であり、運転条件４で回収される熱分解残渣より多くの炭素を回収することが可能となる。 As is apparent from Table 1, when the temperature of the gasifier 3 is 500 ° C. (operating condition 1), the carbon content contained in the pyrolysis residue recovered by the cyclone device 5 is 50%. It becomes possible to recover more carbon than the recovered pyrolysis residue.
以上に説明したように、本発明によれば、有機性廃棄物を処理するに際して、ガス改質炉６内部でのクリンカの生成を回避しつつ、廃棄物処分場の系内で使用する必要分の所内電力を発電し、有機性廃棄物の可燃分を、炭素分を含む熱分解残渣として回収することとしたので、電力や補助燃料等の使用を削減もしくは無くすことができ、自立型の廃棄物処理を実現することが可能となる。
As described above, according to the present invention, when processing organic waste, the necessary amount to be used in the system of the waste disposal site while avoiding the generation of clinker in the
なお、この有機性廃棄物の処理方法で処理される有機性廃棄物は、木質廃棄物等の高発熱廃棄物に限定されず、家庭から排出される一般廃棄物や下水汚泥等であってもよい。 In addition, the organic waste treated by this organic waste treatment method is not limited to high heat waste such as wooden waste, but may be general waste discharged from households, sewage sludge, etc. Good.
以上、現時点において、もっとも、実践的であり、かつ好ましいと思われる実施形態に関連して本発明を説明したが、本発明は、本願明細書中に開示された実施形態に限定されるものではなく、請求の範囲及び明細書全体から読み取れる発明の要旨あるいは思想に反しない範囲で適宜変更可能であり、そのような変更を伴う有機性廃棄物の処理方法もまた技術的範囲に包含されるものとして理解されなければならない。 Although the present invention has been described above in connection with the most practical and preferred embodiments at the present time, the present invention is not limited to the embodiments disclosed herein. In addition, the present invention can be modified as appropriate without departing from the scope or spirit of the invention that can be read from the claims and the entire specification, and a method for treating organic waste accompanied by such changes is also included in the technical scope. Must be understood as.
１ ホッパー
２ フィーダ
３ ガス化炉
４ ブロア
５ サイクロン装置
６ 改質炉
７ ガスエンジン
８ 発電機
５１ 流動床式ガス化炉
５２ 改質炉
５３ ガスエンジン
５４ 発電機
ａ 流動媒体砂
DESCRIPTION OF SYMBOLS 1
Claims (1)
前記ガス化炉の温度及び酸素比を調整して制御することにより、熱分解残渣に含まれる炭素量と改質ガスに含まれる炭素量の配合比率を調整し、前記発電機で必要分の所内電力のみを得つつ、前記サイクロン装置で炭化物を含む熱分解残渣を回収することを特徴とする有機性廃棄物の処理方法。 Organic waste is put into a fluidized bed gasifier and pyrolyzed into pyrolysis residue containing pyrolysis gas, tar and carbon in a low oxygen atmosphere with an air ratio of 1 or less. In addition to removing pyrolysis residues with a cyclone device installed in the plant, tar and pyrolysis gas are supplied to a reforming furnace installed at the subsequent stage of the cyclone device to generate reformed gas, and the reformed gas is supplied to the generator. In a method for treating organic waste used as an energy source,
By adjusting and controlling the temperature and oxygen ratio of the gasifier, the mixing ratio of the carbon amount contained in the pyrolysis residue and the carbon amount contained in the reformed gas is adjusted, A method for treating organic waste, wherein a pyrolysis residue containing carbide is collected by the cyclone apparatus while only electric power is obtained.
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| JP5372343B2 (en) * | 2007-06-04 | 2013-12-18 | 三井造船株式会社 | Tar reforming reactor |
| JP5231837B2 (en) * | 2008-03-06 | 2013-07-10 | メタウォーター株式会社 | Manufacturing method of carbide and fuel gas from organic waste |
| JP4966239B2 (en) * | 2008-03-28 | 2012-07-04 | メタウォーター株式会社 | Organic waste treatment method, gasification furnace, reforming furnace, organic waste treatment equipment |
| JP5460970B2 (en) * | 2008-03-28 | 2014-04-02 | 三井造船株式会社 | Woody biomass gas reforming system |
| JP5521187B2 (en) * | 2008-09-25 | 2014-06-11 | 株式会社神鋼環境ソリューション | Combustible gas generator for gasifying waste and method for producing combustible gas |
| JP6180762B2 (en) * | 2013-03-14 | 2017-08-16 | メタウォーター株式会社 | Fatty acid recovery apparatus and fatty acid recovery method |
| CN105295973B (en) * | 2014-05-30 | 2018-01-26 | 宝山钢铁股份有限公司 | A kind of method that coke is produced using coal ash instead part coal |
| CN107586567A (en) * | 2017-10-17 | 2018-01-16 | 农业部规划设计研究院 | A kind of reformed based on continuous carbonization, gasification cleans joint production process with the pyrolysis gas of biomass charcoal for bakeing coupling processing |
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| JP3245073B2 (en) * | 1996-09-30 | 2002-01-07 | 株式会社東芝 | Processing device and processing method |
| JP3054595B2 (en) * | 1996-10-28 | 2000-06-19 | 日本碍子株式会社 | Pyrolysis melting gasification of waste |
| JPH1121564A (en) * | 1997-06-30 | 1999-01-26 | N K K Plant Kensetsu Kk | Method of decomposition treatment for tar |
| JP2003166705A (en) * | 2001-11-30 | 2003-06-13 | Mitsubishi Heavy Ind Ltd | Method and device for waste disposal by stoker furnace |
| JP3830096B2 (en) * | 2002-06-04 | 2006-10-04 | 日本碍子株式会社 | Carbonization system |
| JP2004051745A (en) * | 2002-07-18 | 2004-02-19 | Ngk Insulators Ltd | System of gasifying biomass |
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