JP2005239991A - Method for refining digestion gas - Google Patents

Method for refining digestion gas Download PDF

Info

Publication number
JP2005239991A
JP2005239991A JP2004085713A JP2004085713A JP2005239991A JP 2005239991 A JP2005239991 A JP 2005239991A JP 2004085713 A JP2004085713 A JP 2004085713A JP 2004085713 A JP2004085713 A JP 2004085713A JP 2005239991 A JP2005239991 A JP 2005239991A
Authority
JP
Japan
Prior art keywords
gas
digestion
digestion gas
tower
absorption tower
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2004085713A
Other languages
Japanese (ja)
Inventor
Yoichi Shimoi
洋一 下井
Takio Adachi
太起夫 安達
Norisada Shimizu
典貞 清水
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tsukishima Kankyo Engineering Ltd
Nippon Steel Eco Tech Corp
Original Assignee
Nittetsu Chemical Engineering Co Ltd
Nittetsu Kakoki KK
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nittetsu Chemical Engineering Co Ltd, Nittetsu Kakoki KK filed Critical Nittetsu Chemical Engineering Co Ltd
Priority to JP2004085713A priority Critical patent/JP2005239991A/en
Publication of JP2005239991A publication Critical patent/JP2005239991A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • 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
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/20—Sludge processing

Abstract

<P>PROBLEM TO BE SOLVED: To increase the calorie of a digestion gas by a relatively simple apparatus and a method using it and to supply a methane gas so as to use the same as fuel or the like. <P>SOLUTION: In the digestion gas refining method, a packed column type absorbing column equipped with a plurality of packed beds partitioned by a gas back flow preventing plate is used to introduce the digestion gas into the bottom of the absorbing column while supplying absorbing water to the absorbing column from the top thereof to bring the digestion gas and the absorbing water to counter contact in the absorbing column to absorb unnecessary gas components such as carbon dioxide, hydrogen sulfide or the like in the digestion gas by absorbing water to take out the refined methane gas from the upper part of the absorbing column. In this digestion gas refining method carbon dioxide and hydrogen sulfide in the digestion gas are removed at the same time by one stage absorbing operation to obtain the refined methane gas. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、下水汚泥消化工程のメタン発酵、生ごみのメタン発酵、バイオマスのメタン発酵、糖蜜発酵残渣液のような高濃度廃水のメタン発酵等の各種分野において発生する消化ガス（メタン発酵ガス）を、都市ガス等の燃料や他の用途に供給することを可能とする消化ガスの精製方法である。  The present invention is a digestion gas (methane fermentation gas) generated in various fields such as methane fermentation in a sewage sludge digestion process, methane fermentation of garbage, methane fermentation of biomass, and methane fermentation of high-concentration wastewater such as molasses fermentation residue. Is a method for purifying digestion gas that can be supplied to fuel such as city gas and other uses.

下水処理等において、活性汚泥設備から発生する余剰汚泥は、メタン菌等の嫌気処理（消化処理）が行われ、余剰汚泥を消化汚泥として減容化させている。この消化工程から発生する消化ガス（メタン発酵ガス）は、二酸化炭素（ＣＯ２）を３０〜４０％含有しており、カロリー５０００〜６０００ｋｃａｌ／Ｎｍ３と低いために、このままでは都市ガスとして用いることはできず、これまではボイラー等で、前記のメタン発酵に必要な熱量を得る以外は、多くは焼却処分がなされていた。In sewage treatment and the like, surplus sludge generated from activated sludge facilities is subjected to anaerobic treatment (digestion treatment) such as methane bacteria, and the excess sludge is reduced in volume as digested sludge. Digestion gas (methane fermentation gas) generated from this digestion process contains 30-40% carbon dioxide (CO 2 ) and is low as calorie 5000-6000 kcal / Nm 3 , so use as it is as city gas. In the past, many were incinerated except for obtaining the amount of heat necessary for methane fermentation with a boiler or the like.

近年のデータによれば、全国の消化設備を有する下水処理場からは、年間約２億７０００万ｍ３もの消化ガスが発生しており、そのうち有効利用されているものは３０〜４０％であり、嫌気性消化に必要な熱源として３０〜４０％が用いられ、利用されずに余剰ガスとして廃棄されるものが３０％との報告もある。
しかしながら、これらは資源の有効利用や地球温暖化防止の見地からも好ましいことではなく、最近では消化ガス中に含まれているＣＯ２を大量の水吸収により除去し、カロリーアップを図り、都市ガス等への利用が試みられている。According to recent data, from the sewage treatment plant with a nationwide digestion equipment, annual and about 270 million m 3 things digestion gas is generated, a 30-40% is what is them effectively utilized There is also a report that 30 to 40% is used as a heat source necessary for anaerobic digestion, and 30% is discarded as surplus gas without being used.
However, these are not preferable from the viewpoint of effective use of resources and prevention of global warming. Recently, CO 2 contained in digestion gas is removed by absorbing a large amount of water, and calorie is increased. The use to etc. is tried.

また、下水処理以外にも地球温暖化防止の見地からメタン発酵は焼却に代わって、例えば生ごみのメタン発酵等として、今後地球環境に優しいプロセスとしてますます注目を集めていくことが予想され、メタン発酵によって生ずる消化ガスの精製も重要な工程となってきている。しかしながら、消化ガスの精製技術は現状では不十分なものである。  In addition to sewage treatment, from the standpoint of preventing global warming, methane fermentation is expected to attract more and more attention as a process that is friendly to the global environment, such as methane fermentation of garbage instead of incineration. Purification of digestion gas produced by methane fermentation has also become an important process. However, digestion gas purification technology is currently insufficient.

消化ガスは、各種廃棄物等を原料とした消化工程から発生するものであり、主成分のメタンを６０％程度、他に二酸化炭素（ＣＯ２）を３０〜４０％とＮＨ３、Ｈ２Ｓ等の若干量を含んでいる。消化ガスに含まれている硫化水素（Ｈ２Ｓ）等の硫化物は、ガス圧縮機や装置を腐食させたり、燃料に混入すると発熱量を低下させるために、予め脱硫処理を行い、その後に吸収塔に導き二酸化炭素を除去するようにしている。このため、脱硫処理と吸収処理の２段階の設備が必要であった。
消化ガスや消化ガスの脱硫処理については、例えば非特許文献１に記載されている。Digestion gas is generated from the digestion process using various wastes as raw materials. About 60% of the main component methane, 30-40% of carbon dioxide (CO 2 ), NH 3 , H 2 S Etc. contain some amount. Sulfides such as hydrogen sulfide (H 2 S) contained in digestion gas are subjected to desulfurization treatment in advance in order to corrode gas compressors and equipment or to reduce the calorific value when mixed with fuel. It leads to the absorption tower to remove carbon dioxide. Therefore, a two-stage facility for desulfurization treatment and absorption treatment is necessary.
For example, Non-Patent Document 1 describes digestion gas and digestion gas desulfurization treatment.

また、従来法では、脱硫処理後の消化ガス中の含まれているＣＯ２を、吸収塔で水吸収によって除去しており、ＣＯ２が水に溶解し難いために、吸収塔の塔高を高くすることが必要で、大規模な設備となっていた。In the conventional method, CO 2 contained in the digestion gas after the desulfurization treatment is removed by water absorption in the absorption tower, and since CO 2 is difficult to dissolve in water, the tower height of the absorption tower is increased. It was necessary to make it high and it was a large-scale facility.

水吸収以外の方法としては、特許文献１のように消化ガスから二酸化炭素を吸着により除去する設備が提案されているが、この場合にも、消化ガスは予め脱硫処理を施す必要がある旨説明されている。
「下・廃水汚泥の処理」、発行所コロナ社、昭和４５年１２月１５日再版発行、ｐ．１４２〜１４５ 特開２００１−１７０６９５号公報「メタンガス精製設備および家畜糞尿処理施設」 As a method other than water absorption, an apparatus for removing carbon dioxide from the digestion gas by adsorption as in Patent Document 1 has been proposed, but in this case as well, the digestion gas needs to be desulfurized in advance. Has been.
“Treatment of sewage / wastewater sludge”, Issued by Corona Publishing Co., Ltd., reissued December 15, 1970, p. 142-145 Japanese Patent Laid-Open No. 2001-170695 “Methane Gas Purification Facility and Livestock Manure Treatment Facility”

本発明は、上述した従来法における問題点を解決する消化ガスの精製方法を提案するものであり、比較的簡便な装置と方法により、消化ガスのカロリーアップを図り、精製されたメタンガスが燃料等の用途にも供給可能なものにするものである。
また、本発明の別の目的としては、消化ガスの精製工程の効率化を図り、吸収塔における吸収操作によって、二酸化炭素を除去するだけでなく硫化水素も一緒に除去することを意図したものである。The present invention proposes a method for purifying digestion gas that solves the problems in the conventional methods described above. By using a relatively simple apparatus and method, the digestion gas is increased in calories, and the purified methane gas is used as fuel or the like. It can also be supplied to other uses.
Another object of the present invention is to improve the efficiency of the digestion gas purification process and to remove not only carbon dioxide but also hydrogen sulfide by an absorption operation in an absorption tower. is there.

本発明は、塔内にガス逆流防止板で仕切られた複数の充填層を備えた充填塔形式の吸収塔を用い、前記吸収塔の塔底に消化ガスを導入し、塔頂から吸収水を供給して、吸収塔内で消化ガスと吸収水とを向流接触させて、消化ガス中の二酸化炭素、硫化水素等の不要ガス成分を吸収水に吸収させ、吸収塔の上部より精製メタンガスを取出すことを特徴とする消化ガスの精製方法である。  The present invention uses a packed tower type absorption tower provided with a plurality of packed beds partitioned by gas backflow prevention plates in the tower, introduces digestion gas into the tower bottom of the absorption tower, and absorbs absorbed water from the tower top. Supply the digestion gas and absorption water countercurrently in the absorption tower, and absorb unnecessary gas components such as carbon dioxide and hydrogen sulfide in the digestion gas into the absorption water. Purify methane gas from the top of the absorption tower. A digestion gas purification method characterized by taking out.

さらには、吸収塔内へ消化ガスを導入するために、吸収塔の上部から精製メタンガスを取出すためのガス圧縮機を駆動源として利用するようにした上記の消化ガスの精製方法である。  Furthermore, in order to introduce digestion gas into the absorption tower, the above-described digestion gas purification method uses a gas compressor for taking out purified methane gas from the upper part of the absorption tower as a drive source.

本発明は、比較的に簡便な装置により、従来法におけるいろいろな問題点を解決することが可能な消化ガスの精製方法を提供することができる。特に、本発明では、消化ガス中に含まれている二酸化炭素と硫化水素等の不要ガス成分を一緒に吸収水に吸収させて除去することができるために、操作性が向上する。すなわち、消化ガス中の硫化水素は含有量が少ないために、従来のように予め脱硫処理を施す場合には、大量の消化ガスを処理するための負荷が大きく、そのための設備も必要であった。
本発明により得られる精製メタンガスは、メタンの含有割合が高く、高品質で発熱量がアップすることにより、燃料等の用途に供給できるだけでなく、その他の化学的な用途等への適用も可能となる。
また、設備としては、本発明の適用で、吸収塔としては塔の高さを低くすることが可能となることから、この観点でも貢献するところが大きいものである。INDUSTRIAL APPLICABILITY The present invention can provide a digestion gas purification method capable of solving various problems in the conventional method with a relatively simple apparatus. In particular, in the present invention, carbon dioxide and unnecessary gas components such as hydrogen sulfide contained in the digestion gas can be absorbed together in the absorption water and removed, so that the operability is improved. That is, since the content of hydrogen sulfide in the digestion gas is small, when the desulfurization treatment is performed in advance as in the prior art, the load for treating a large amount of digestion gas is large, and equipment for that is also necessary. .
The purified methane gas obtained by the present invention has a high methane content ratio, high quality and increased calorific value, so that it can be supplied not only to fuel applications, but also to other chemical applications. Become.
In addition, as an equipment, the application of the present invention makes it possible to reduce the height of the tower as an absorption tower.

本発明では、メタン発酵工程から排出されるメタンを主成分とし、二酸化炭素（ＣＯ２）や硫化水素等を含む消化ガス（メタン発酵ガス）を、塔内にガス逆流防止板で仕切られた複数の充填層を備えた充填塔形式の吸収塔の塔底に導入し、吸収水を塔頂から流下させて、消化ガスの二酸化炭素や硫化水素等の不要ガス成分を吸収水に吸収させることにより、精製メタンガス中に含まれてくる二酸化炭素の含有量を低減させ、結果として精製されたメタンガスのカロリーアップを図っている。
本発明の充填塔形式の吸収塔を用いて、消化ガスを吸収処理することで、効率的になり吸収塔の塔高を低くすることが可能となる。In the present invention, a plurality of digestion gases (methane fermentation gas) containing methane discharged from the methane fermentation process as a main component and containing carbon dioxide (CO 2 ), hydrogen sulfide, and the like are partitioned in the tower by gas backflow prevention plates. Introducing into the tower bottom of a packed tower type absorption tower equipped with a packed bed, allowing the absorbed water to flow down from the top of the tower, and absorbing unnecessary gas components such as carbon dioxide and hydrogen sulfide in the digestion gas into the absorbed water The carbon dioxide content contained in the purified methane gas is reduced, and as a result, the calorie of the purified methane gas is increased.
By using the packed tower type absorption tower of the present invention to absorb digestion gas, it becomes efficient and the tower height of the absorption tower can be lowered.

本発明では、消化ガスから二酸化炭素や硫化水素等の不要ガス成分を吸収水に吸収させる操作を行っているが、水へのガスの溶解度を表わす定数としてヘンリー定数が知られており、２５℃におけるＣＯ２のヘンリー定数は１６００ａｔｍ／ｍｏｌｆｒで、水に難溶性のガスである。
一方、硫化水素の２５℃におけるヘンリー定数は５５０ａｔｍ／ｍｏｌｆｒで、ＣＯ２の１／３であり、比較的水に容易に溶解するために、吸収処理は容易であると思われれるかもしれないが、通常の充填塔を用いた場合には期待したような性能は得られない。In the present invention, an operation of absorbing unnecessary gas components such as carbon dioxide and hydrogen sulfide from digestion gas into absorbed water is performed. The Henry constant is known as a constant representing the solubility of gas in water, and is 25 ° C. The Henry's constant of CO 2 at 1600 is 1600 atm / mol fr and is a hardly soluble gas in water.
On the other hand, hydrogen sulfide has a Henry's constant at 25 ° C. of 550 atm / molfr, which is 1/3 of CO 2 , and is relatively easy to dissolve in water, so it may seem that the absorption treatment is easy. In the case of using a normal packed tower, the expected performance cannot be obtained.

充填層を一層だけ設けてあるような通常の充填塔を用いて、消化ガスの水吸収処理を行い二酸化炭素と硫化水素を同時に除去しようとすると、消化ガス中に多量に存在しているＣＯ２が律速になって、塔径が決まりガス速度が遅くなるために、塔内でガスの逆混合が生じ性能が出ないことになる。When an ordinary packed tower in which only one packed bed is provided is used to perform water absorption treatment of digestion gas and simultaneously remove carbon dioxide and hydrogen sulfide, CO 2 present in a large amount in the digestion gas. However, since the column diameter is determined and the gas velocity is reduced, gas back-mixing occurs in the column and performance is not achieved.

このため、本発明では吸収塔内で消化ガスと吸収水とを向流接触させる際に、ガスの逆混合を抑制し、効率的な水吸収が行われるように、吸収塔としてガス逆流防止板で仕切られた複数の充填層を備えた充填塔を用いるようにした。  Therefore, in the present invention, when the digestion gas and the absorption water are brought into countercurrent contact in the absorption tower, the gas backflow prevention plate is used as the absorption tower so that the back mixing of the gas is suppressed and efficient water absorption is performed. A packed tower provided with a plurality of packed beds partitioned by a column is used.

特に、本発明で対象としている消化ガス中の二酸化炭素のように水に難溶性のガスを、水吸収により除去する場合には、水量に対するガス量が非常に少ないために、塔内でガスの逆混合が生じて向流接触が不完全となり易く、吸収を阻害し効率を低下させる。この対策として、本発明では吸収塔に、塔内にガス逆流防止板で仕切られた複数の充填層を備えた充填塔形式の吸収塔を用いており、これが本発明の特徴である。ガス逆流防止板は、通常使用されている多孔板で開口面積を制限したものでもよいが、ガス孔と液孔を分け、ガスライザーを設けた形式のものが好ましい。
本発明で吸収塔として使用する前記のガス逆流防止板で仕切られた複数の充填層を備えた充填塔については、特開２０００−１６７３６６号公報や特開２００１−１２０９８２号公報等に詳しく開示されている。In particular, in the case where a gas hardly soluble in water such as carbon dioxide in the digestion gas targeted by the present invention is removed by water absorption, the amount of gas relative to the amount of water is very small. Back-mixing occurs and countercurrent contact tends to be incomplete, impairing absorption and reducing efficiency. As a countermeasure, the present invention uses a packed tower type absorption tower having a plurality of packed beds partitioned by gas backflow prevention plates in the tower, which is a feature of the present invention. The gas backflow prevention plate may be a commonly used perforated plate with a limited opening area, but is preferably of a type in which gas holes and liquid holes are divided and a gas riser is provided.
The packed tower having a plurality of packed beds partitioned by the gas backflow prevention plate used as an absorption tower in the present invention is disclosed in detail in Japanese Patent Application Laid-Open Nos. 2000-167366 and 2001-120982. ing.

本発明の内容を、図面を用いて説明する。図１は、本発明の消化ガスを精製し、精製メタンガスとする場合のフローの一例を示すものである。
図示していないメタン発酵槽等から発生した消化ガス１は、精製のために吸収塔３の底部に送られる。ガス逆流防止板で仕切られた複数の充填層を備えた充填塔を用いた吸収塔３の塔底より、吸収塔内に消化ガスが導入され、一方の吸収水２は、吸収塔３の塔頂から塔内に供給される。吸収塔３内で消化ガスと吸収水とが向流接触し、消化ガス中の二酸化炭素、硫化水素等の不要ガス成分が除去された精製メタンガス５は吸収塔の上部より取出される。The contents of the present invention will be described with reference to the drawings. FIG. 1 shows an example of a flow in the case where the digestion gas of the present invention is purified to obtain purified methane gas.
Digestion gas 1 generated from a methane fermenter or the like not shown is sent to the bottom of absorption tower 3 for purification. Digestion gas is introduced into the absorption tower from the bottom of the absorption tower 3 using a packed tower having a plurality of packed beds partitioned by a gas backflow prevention plate, and one of the absorption water 2 is the tower of the absorption tower 3. It is fed into the tower from the top. In the absorption tower 3, the digestion gas and the absorption water come into countercurrent contact, and the purified methane gas 5 from which unnecessary gas components such as carbon dioxide and hydrogen sulfide in the digestion gas have been removed is taken out from the upper part of the absorption tower.

消化ガスの発生量が安定している場合には、消化ガスの発生するメタンガスの発生元から直接に消化ガスを吸収塔に供給してもよい。この他、消化ガスを一旦ガスホルダー等に貯留して、吸収塔の手前に圧縮機等を設置して、吸収塔へ送付するようにしてもよいが、脱硫処理を施していない消化ガスには腐食性の硫化水素が含まれているために、耐食性の機器を設置する必要があり設備的な負担が大きくなる。
このため、精製メタンガス５を吸収塔の上部より系外へ取出すために設置されているガス圧縮機４を利用し、吸収塔の手前に圧縮機等を設置することなく、消化ガスを吸収塔に導入するための駆動源としてガス圧縮機を用いるようにすることが好ましい。この場合には、吸収塔内を若干の負圧とさせ、消化ガスを導入することも可能となる。しかも、精製メタンガスの取出し側に圧縮機等を設置することになり、既に脱硫処理後のメタンガスを取扱うために、通常の機器類を用いることが可能となる。前述のケースでは、吸収塔内が若干の負圧となる場合を説明したが、消化ガスを一旦ガスホルダー等に貯留する場合には、貯留状況の圧力に応じて、消化ガスを吸収塔内へ供給可能なように制御すればよい。
尚、前記の説明ではガス圧縮機を例示したが、消化ガスを吸収塔に導入するための駆動源とするためであれば、送風機であっても同様の効果が期待できる。When the generation amount of digestion gas is stable, the digestion gas may be directly supplied to the absorption tower from the generation source of methane gas that generates the digestion gas. In addition, the digestion gas may be temporarily stored in a gas holder, and a compressor may be installed in front of the absorption tower and sent to the absorption tower. Since corrosive hydrogen sulfide is contained, it is necessary to install a corrosion-resistant device, which increases the burden on facilities.
Therefore, using the gas compressor 4 installed to take the purified methane gas 5 out of the system from the upper part of the absorption tower, the digestion gas is supplied to the absorption tower without installing a compressor or the like in front of the absorption tower. It is preferable to use a gas compressor as a drive source for introduction. In this case, it is also possible to introduce digestion gas with a slight negative pressure in the absorption tower. In addition, a compressor or the like is installed on the extraction side of the purified methane gas, and ordinary equipment can be used to handle the methane gas that has already been desulfurized. In the above-mentioned case, the case where the inside of the absorption tower has a slight negative pressure has been described. However, when digestion gas is temporarily stored in a gas holder or the like, the digestion gas is transferred into the absorption tower according to the pressure of the storage state. What is necessary is just to control so that supply is possible.
In addition, although the gas compressor was illustrated in the said description, if it is used as a drive source for introducing digestion gas into an absorption tower, the same effect can be expected even with a blower.

消化ガスの精製後に吸収塔の底部から排出される排水６には、吸収されたＨ２Ｓが含まれているが、これまでに脱硫処理として種々の方法が知られているので、必要に応じて公知の乾式脱硫法や湿式脱硫法を適用するようにすればよい。The waste water 6 discharged from the bottom of the absorption tower after purification of digestion gas contains absorbed H 2 S, but various methods are known as desulfurization treatments so far. Thus, a known dry desulfurization method or wet desulfurization method may be applied.

比較例Comparative example

最初に比較例として、従来法による脱硫処理と脱炭酸処理を別々に行った場合を示す。
消化ガスを乾式脱硫により、予め脱硫処理を施した後、８０００ｍｍの充填層を備えた充填塔を吸収塔として用いて、脱炭酸処理を行った。
吸収塔の仕様および結果を表１にまとめて示した。First, as a comparative example, a case where desulfurization treatment and decarboxylation treatment by a conventional method are performed separately is shown.
The digestion gas was previously desulfurized by dry desulfurization, and then decarbonation was performed using a packed tower having a packed bed of 8000 mm as an absorption tower.
The specifications and results of the absorption tower are summarized in Table 1.

比較例と同じ消化ガスを使い、塔内にガス逆流防止板で仕切られた複数の充填層を備えた充填塔形式の吸収塔を用いて、図１の設備により精製した。本実施例では、ガスライザーと液孔を備えたガス逆流防止板を、充填塔の垂直方向に充填層に対応して複数設置した構造の充填塔を吸収塔として用いた。尚、充填層は４００ｍｍ×５段である。吸収塔の仕様および結果を表１にまとめて示した。  The same digestion gas as in the comparative example was used, and purification was performed by the equipment of FIG. 1 using a packed tower type absorption tower having a plurality of packed beds partitioned by a gas backflow prevention plate in the tower. In this example, a packed tower having a structure in which a plurality of gas backflow prevention plates each having a gas riser and a liquid hole was installed in the vertical direction of the packed tower corresponding to the packed bed was used as an absorption tower. The packed bed is 400 mm × 5 stages. The specifications and results of the absorption tower are summarized in Table 1.

Figure 2005239991
Figure 2005239991

表１の試験結果からは、本発明により１段階の吸収操作により、消化ガス中に含まれている二酸化炭素と硫化水素を一緒に除去できることが判る。本発明により得られる精製メタンガスは、メタンの含有割合が高いことも理解される。燃料ガスとしての発熱量は、メタン含有量が多く不純物が少ないほど効率的であるから、高品質であることはカロリーアップにつながり、燃料等の用途に供給可能となる。
また、設備的には、本発明の適用で、吸収塔の高さを低くすることが可能となる。From the test results in Table 1, it can be seen that carbon dioxide and hydrogen sulfide contained in the digestion gas can be removed together by a one-stage absorption operation according to the present invention. It is also understood that the purified methane gas obtained by the present invention has a high methane content ratio. Since the calorific value as fuel gas is more efficient as the methane content is larger and the impurities are smaller, the high quality leads to an increase in calories and can be supplied to applications such as fuel.
In terms of equipment, the height of the absorption tower can be reduced by applying the present invention.

本発明の消化ガスを精製し、精製メタンガスとする場合のフローの一例である。It is an example of the flow in the case of refine | purifying the digestive gas of this invention, and setting it as refined methane gas.

符号の説明Explanation of symbols

１ 消化ガス
２ 吸収水
３ 吸収塔
４ ガス圧縮機
５ 精製メタンガス
６ 排水1 Digestion gas 2 Absorbed water 3 Absorption tower 4 Gas compressor 5 Purified methane gas 6 Drainage

Claims (2)

塔内にガス逆流防止板で仕切られた複数の充填層を備えた充填塔形式の吸収塔を用い、前記吸収塔の塔底に消化ガスを導入し、塔頂から吸収水を供給して、吸収塔内で消化ガスと吸収水とを向流接触させて、消化ガス中の二酸化炭素、硫化水素等の不要ガス成分を吸収水に吸収させ、吸収塔の上部より精製メタンガスを取出すことを特徴とする消化ガスの精製方法。  Using a packed tower type absorption tower provided with a plurality of packed beds partitioned by gas backflow prevention plates in the tower, introducing digestion gas into the tower bottom of the absorption tower, supplying absorbed water from the tower top, Characteristically, digestion gas and absorbed water are brought into countercurrent contact in the absorption tower to absorb unnecessary gas components such as carbon dioxide and hydrogen sulfide in the digestion gas into the absorption water, and purified methane gas is taken out from the upper part of the absorption tower. A method for purifying digestion gas. 吸収塔内へ消化ガスを導入するために、吸収塔の上部から精製メタンガスを取出すためのガス圧縮機を駆動源として利用する請求項１記載の消化ガスの精製方法。  The method for purifying digestion gas according to claim 1, wherein a gas compressor for taking out purified methane gas from the upper part of the absorption tower is used as a drive source in order to introduce digestion gas into the absorption tower.
JP2004085713A 2004-02-26 2004-02-26 Method for refining digestion gas Pending JP2005239991A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2004085713A JP2005239991A (en) 2004-02-26 2004-02-26 Method for refining digestion gas

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2004085713A JP2005239991A (en) 2004-02-26 2004-02-26 Method for refining digestion gas

Publications (1)

Publication Number Publication Date
JP2005239991A true JP2005239991A (en) 2005-09-08

Family

ID=35022048

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2004085713A Pending JP2005239991A (en) 2004-02-26 2004-02-26 Method for refining digestion gas

Country Status (1)

Country Link
JP (1) JP2005239991A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010106098A (en) * 2008-10-29 2010-05-13 Osaka Prefecture Method and device for gas purification
KR101086971B1 (en) * 2009-04-02 2011-11-29 재단법인 포항산업과학연구원 Method and Apparatus of Refining Bio-Methane Gas

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0824570A (en) * 1994-07-22 1996-01-30 Kurita Water Ind Ltd Desulfurizing device for anaerobic biological reaction gas
US6423235B1 (en) * 1999-08-18 2002-07-23 Nittetu Chemical Engineering Ltd. Column gas-liquid contacting apparatus and its use thereof
JP2002275482A (en) * 2001-03-16 2002-09-25 Ebara Corp Method for power generation by digested gas and power generation system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0824570A (en) * 1994-07-22 1996-01-30 Kurita Water Ind Ltd Desulfurizing device for anaerobic biological reaction gas
US6423235B1 (en) * 1999-08-18 2002-07-23 Nittetu Chemical Engineering Ltd. Column gas-liquid contacting apparatus and its use thereof
JP2002275482A (en) * 2001-03-16 2002-09-25 Ebara Corp Method for power generation by digested gas and power generation system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010106098A (en) * 2008-10-29 2010-05-13 Osaka Prefecture Method and device for gas purification
KR101086971B1 (en) * 2009-04-02 2011-11-29 재단법인 포항산업과학연구원 Method and Apparatus of Refining Bio-Methane Gas

Similar Documents

Publication Publication Date Title
CN1215592C (en) Fuel cell power generation method and system
US20110244555A1 (en) Method and system for purifying raw gases, particularly biogas, for obtaining methane
JP2006036849A (en) System for treating and utilizing biomass and method for treating and utilizing biomass gas
US20120097027A1 (en) Method and system for purifying biogas for extracting methane
JP2010022965A (en) Desulfurization method and apparatus for digestive gas
JP5166014B2 (en) Equipment for removing dissolved hydrogen sulfide in anaerobic treatment
JP2000263084A (en) Waste water treatment equipment and waste water treatment method
JP2008127407A (en) Biogas purification system
JP2004083542A (en) Process for purifying methane fermentation gas
JP2004135579A (en) Biodesulfurization system for biogas
JP2003277779A (en) Equipment for desulfurization of biogas
JP2002079034A (en) Biological desulfurization method and apparatus
JP2002079051A (en) Method for deodorizing hydrogen sulfide containing gas
JP2005239991A (en) Method for refining digestion gas
JP5773381B2 (en) Ammonia removing apparatus, organic waste processing apparatus and processing method using the same
JP4299168B2 (en) Anaerobic treatment equipment
JP2009207944A (en) Method for removing hydrogen sulfide from biogas
JP2002113494A (en) Method and apparatus for treating livestock waste
JPH0839090A (en) Desulfurization equipment of anaerobic biological reaction gas
JP6113611B2 (en) Organic wastewater treatment system
JP2010024443A (en) Method for desulfurizing digestion gas and desulfurizer therefor
JP4223419B2 (en) Bioreactor and organic waste energy recovery system using the same
JP2008030008A (en) Methane fermentation method of organic waste
JPH0852491A (en) Treatment of anaerobic biological reaction gas
JP3193273B2 (en) How to use anaerobic digestion gas

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20060421

RD03 Notification of appointment of power of attorney

Free format text: JAPANESE INTERMEDIATE CODE: A7423

Effective date: 20061222

RD04 Notification of resignation of power of attorney

Free format text: JAPANESE INTERMEDIATE CODE: A7424

Effective date: 20070130

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20090727

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20090804

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20091001

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20101026

A02 Decision of refusal

Free format text: JAPANESE INTERMEDIATE CODE: A02

Effective date: 20110308