JP2005319374A - Method and apparatus for converting sludge into fuel - Google Patents

Method and apparatus for converting sludge into fuel Download PDF

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JP2005319374A
JP2005319374A JP2004138274A JP2004138274A JP2005319374A JP 2005319374 A JP2005319374 A JP 2005319374A JP 2004138274 A JP2004138274 A JP 2004138274A JP 2004138274 A JP2004138274 A JP 2004138274A JP 2005319374 A JP2005319374 A JP 2005319374A
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sludge
furnace
carbonization
line
fuel
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JP5148809B2 (en
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Takeshi Amari
猛 甘利
Hirofumi Kudo
弘文 工藤
Akira Tajima
彰 田島
Takeo Kishi
丈夫 岸
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Tokyo Metropolitan Sewerage Service Corp
Mitsubishi Heavy Industries Ltd
Tokyo Electric Power Co Holdings Inc
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Tokyo Electric Power Co Inc
Tokyo Metropolitan Sewerage Service Corp
Mitsubishi Heavy Industries Ltd
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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
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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    • Y02W10/40—Valorisation of by-products of wastewater, sewage or sludge processing

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Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for converting sludge into fuel capable of substantially reducing the amount of usage of a fossil fuel in a carbonization process for converting the sludge into the fuel, and an apparatus. <P>SOLUTION: The apparatus includes a carbonization furnace 30 for carbonizing the sludge to generate a thermally decomposed gas and carbide, a sludge incinerator 70 for incinerating the sludge and a line 74 for feeding the exhaust gas of incinerated sludge generated in the sludge incinerator to the carbonization furnace as a heat source. A line 76 for feeding a part of the carbide from the carbonization furnace to the sludge incinerator as the fuel can further be included. Also, a dewaterer 10 for dewatering the sludge, a drying furnace 20 for drying the dewatered sludge, a line 21 for feeding a part of the dried sludge from the drying furnace to the carbonization furnace and a line 77 for feeding the remnant of the dried sludge from the drying furnace to the sludge incinerator can further be included. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、下水処理場などで発生する汚泥の燃料化方法及び装置に関する。   The present invention relates to a method and an apparatus for fueling sludge generated at a sewage treatment plant or the like.

ＣＯ2排出量を低減する観点から、化石燃料の代替エネルギーとして、カーボンニュートラルであるバイオマスが注目されている。バイオマスの一つである有機性汚泥は、大半が埋め立て処理あるいは焼却処理されており、エネルギー利用されていない。そこで、ＣＯ2の排出を抑制するために、すなわち、化石燃料の使用を抑制するために、安定した収集量が見込める下水汚泥を、炭化処理により固体燃料化して、石炭火力発電用の燃料にするシステムが考えられている。 From the standpoint of reducing CO 2 emissions, carbon neutral biomass has attracted attention as an alternative energy to fossil fuels. Organic sludge, which is one of the biomass, is mostly landfilled or incinerated, and does not use energy. Therefore, in order to suppress the emission of CO 2 , that is, to suppress the use of fossil fuels, sewage sludge that can be stably collected is converted into a solid fuel by carbonization to be a fuel for coal-fired power generation. The system is considered.

しかしながら、汚泥を焼却処理する場合は、汚泥の発熱量を全て焼却熱に使えるので助燃料の使用量は少ないが、汚泥を炭化処理する場合は、炭化物に熱量を残すために助燃料の使用量が多くなる。助燃料には化石燃料が使用されているので、化石燃料の代替燃料を製造するために多量の化石燃料が使用されてしまっては、実質的なＣＯ2排出量の低減を図ることができない。 However, when incinerating sludge, the amount of heat generated from the sludge can be used for incineration heat, so the amount of auxiliary fuel used is small. However, when carbonizing sludge, the amount of auxiliary fuel used is used to leave the heat in the carbide. Will increase. Since fossil fuel is used as the auxiliary fuel, if a large amount of fossil fuel is used to produce an alternative fuel for fossil fuel, it is not possible to substantially reduce CO 2 emissions.

そこで、例えば、特開２００２−１９２１９６号公報に記載されるように、汚泥を炭化炉により加熱して炭化物とともに熱分解ガスを発生させ、この熱分解ガスをガスタービンやガスエンジンなどの燃焼機関に供給して省エネルギー化を図る方法が提案されている。   Therefore, for example, as described in JP-A-2002-192196, sludge is heated by a carbonization furnace to generate pyrolysis gas together with carbides, and this pyrolysis gas is supplied to a combustion engine such as a gas turbine or a gas engine. A method for supplying energy to save energy has been proposed.

また、特開２００３−９５６２９号公報では、汚泥を炭化炉により加熱して炭化物とともに熱分解ガスを発生させ、この炭化物を熱分解ガス燃焼式溶融炉にて溶融して結晶スラグ化する一方、溶融炉上部の二次燃焼室で熱分解ガスを二次燃焼した燃焼排ガスを、上記炭化炉の熱源として利用する方法が提案されている。
特開２００２−１９２１９６号公報（図１） 特開２００３−９５６２９号公報（図１） In JP 2003-95629 A, sludge is heated in a carbonization furnace to generate pyrolysis gas together with carbides, and the carbides are melted in a pyrolysis gas combustion type melting furnace to be converted into crystal slag. A method has been proposed in which combustion exhaust gas obtained by secondary combustion of pyrolysis gas in the secondary combustion chamber at the upper part of the furnace is used as a heat source for the carbonization furnace.
JP 2002-192196 A (FIG. 1) Japanese Patent Laying-Open No. 2003-95629 (FIG. 1)

しかしながら、上記特開２００２−１９２１９６号公報に記載されている技術では、炭化炉で発生する熱分解ガスのみで燃焼機関を運転させたとしても、汚泥を炭化処理するのに必要なエネルギーを十分に得ることはできないので、助燃料として多量の化石燃料を使用する必要があるという問題がある。また、上記特開２００３−９５６２９号公報も同様に、炭化炉で発生する熱分解ガスのみでは溶融炉および炭化炉に必要なエネルギーを十分に得ることはできないので、助燃料として多量の化石燃料を使用する必要があるという問題がある。   However, in the technique described in the above-mentioned Japanese Patent Application Laid-Open No. 2002-192196, even if the combustion engine is operated only with the pyrolysis gas generated in the carbonization furnace, the energy necessary for carbonizing the sludge is sufficiently obtained. There is a problem that it is necessary to use a large amount of fossil fuel as auxiliary fuel because it cannot be obtained. Similarly, in the above Japanese Patent Application Laid-Open No. 2003-95629, a sufficient amount of fossil fuel can be used as auxiliary fuel because sufficient energy required for the melting furnace and the carbonizing furnace cannot be obtained only by the pyrolysis gas generated in the carbonizing furnace. There is a problem that it needs to be used.

そこで本発明は、上記の問題点に鑑み、汚泥を燃料化するための炭化処理において、化石燃料の使用量を大幅に削減することができる汚泥の燃料化方法及び装置を提供することを目的とする。   Therefore, in view of the above problems, the present invention has an object to provide a sludge fuelizing method and apparatus capable of significantly reducing the amount of fossil fuel used in carbonization treatment for converting sludge into fuel. To do.

上記の目的を達成するために、本発明に係る汚泥の燃料化方法は、汚泥を炭化処理して熱分解ガス及び炭化物を生成させる炭化工程と、汚泥を焼却して汚泥焼却排ガスを発生させる汚泥焼却工程とを含んでなり、前記汚泥焼却排ガスを前記炭化処理の熱源として用いることを特徴とする。   In order to achieve the above object, the sludge fueling method according to the present invention includes a carbonization process in which sludge is carbonized to generate pyrolysis gas and carbide, and sludge incinerated to generate sludge incineration exhaust gas. An incineration step, wherein the sludge incineration exhaust gas is used as a heat source for the carbonization treatment.

汚泥の焼却には、燃焼を安定させるために若干量の液体燃料（化石燃料）が必要であるものの、汚泥の炭化処理に比べて化石燃料の使用量は非常に少ない。そこで、汚泥焼却時に発生する汚泥焼却排ガスを炭化処理の熱源として用いることで、化石燃料の使用量を大幅に削減することができる。   Incineration of sludge requires a small amount of liquid fuel (fossil fuel) to stabilize combustion, but the amount of fossil fuel used is very small compared to the sludge carbonization treatment. Therefore, the amount of fossil fuel used can be significantly reduced by using the sludge incineration exhaust gas generated during sludge incineration as a heat source for carbonization.

また、前記汚泥焼却工程において、汚泥の含水率が高いなどの理由から、化石燃料の使用量が増加する場合がある。この場合は、前記炭化工程で得られる炭化物の一部を、前記汚泥焼却工程で汚泥とともに焼却するか、汚泥を脱水、乾燥し、乾燥させた汚泥の一部を前記炭化工程で炭化するとともに、乾燥させた汚泥の残部を前記汚泥焼却工程で焼却するか、又はこれらを組み合わせて採用することもできる。これにより、化石燃料の使用量を大幅に削減することができる。   Moreover, in the said sludge incineration process, the usage-amount of a fossil fuel may increase for reasons, such as the high moisture content of sludge. In this case, a part of the carbide obtained in the carbonization step is incinerated with the sludge in the sludge incineration step, or the sludge is dehydrated and dried, and a part of the dried sludge is carbonized in the carbonization step. The remainder of the dried sludge can be incinerated in the sludge incineration step, or a combination of these can be employed. Thereby, the usage-amount of a fossil fuel can be reduced significantly.

本発明は、別の態様として、汚泥の燃料化装置であって、汚泥を炭化処理して熱分解ガス及び炭化物を生成させる炭化炉と、汚泥を焼却する汚泥焼却炉と、該汚泥焼却炉で発生した汚泥焼却排ガスを熱源として前記炭化炉に供給するラインとを備えることを特徴とする。なお、前記炭化炉から前記炭化物の一部を燃料として前記汚泥焼却炉に供給するラインを更に備えることができる。また、汚泥を脱水する脱水機と、脱水した汚泥を乾燥する乾燥炉と、該乾燥炉から乾燥させた汚泥の一部を前記炭化炉に供給するラインと、該乾燥炉から乾燥させた汚泥の残部を前記汚泥焼却炉に供給するラインとを更に備えることもできる。   The present invention, as another aspect, is a sludge fueling apparatus comprising a carbonization furnace that carbonizes sludge to produce pyrolysis gas and carbide, a sludge incinerator that incinerates sludge, and the sludge incinerator. And a line for supplying the generated sludge incineration exhaust gas to the carbonization furnace as a heat source. Note that a line for supplying a part of the carbide from the carbonization furnace as fuel to the sludge incinerator can be further provided. Further, a dehydrator for dewatering sludge, a drying furnace for drying the dehydrated sludge, a line for supplying a part of the sludge dried from the drying furnace to the carbonization furnace, and a sludge dried from the drying furnace A line for supplying the remainder to the sludge incinerator can be further provided.

このように、本発明によれば、汚泥を燃料化するための炭化処理において、化石燃料の使用量を大幅に削減することができる汚泥の燃料化方法及び装置を提供することができる。   As described above, according to the present invention, it is possible to provide a sludge fuelizing method and apparatus capable of greatly reducing the amount of fossil fuel used in the carbonization process for converting sludge into fuel.

図１は、本発明に係る汚泥の炭化処理装置の一実施の形態示す模式図である。図１に示すように、汚泥の炭化処理装置は、下水汚泥１を脱水する脱水機１０と、脱水した下水汚泥に熱風を直接接触させて乾燥する乾燥炉２０と、乾燥させた下水汚泥を炭化処理する外熱式ロータリーキルン型の炭化炉３０と、炭化炉３０で生成した熱分解ガスを燃焼する燃焼炉４０と、脱水された下水汚泥を焼却する汚泥焼却炉７０とから主に構成されている。   FIG. 1 is a schematic view showing an embodiment of a sludge carbonization apparatus according to the present invention. As shown in FIG. 1, the sludge carbonization apparatus includes a dehydrator 10 for dewatering sewage sludge 1, a drying furnace 20 for directly drying hot sewage sludge in contact with hot air, and carbonizing the dried sewage sludge. It mainly comprises an externally heated rotary kiln type carbonization furnace 30 to be treated, a combustion furnace 40 that combusts pyrolysis gas generated in the carbonization furnace 30, and a sludge incinerator 70 that incinerates dewatered sewage sludge. .

乾燥炉２０は、熱風を直接接触させる方式に限定されず、脱水汚泥を燃焼させずに乾燥できるものであれば特に限定されない。炭化炉３０は、外熱式ロータリーキルン型のものに限定されず、内燃式でも、流動床型又はスクリュー型でも良い。なお、図１では、乾燥炉２０と炭化炉３０は別々の設備として図示してあるが、一体型の乾燥炭化炉としても良い。   The drying furnace 20 is not limited to a method in which hot air is directly contacted, and is not particularly limited as long as it can be dried without burning dehydrated sludge. The carbonization furnace 30 is not limited to an externally heated rotary kiln type, and may be an internal combustion type, a fluidized bed type or a screw type. In FIG. 1, the drying furnace 20 and the carbonization furnace 30 are illustrated as separate facilities, but may be an integrated drying carbonization furnace.

脱水機１０と乾燥炉２０とはライン１１で接続されており、このライン１１はポンプによって汚泥を圧送できる配管などが好ましい。乾燥炉２０と炭化炉３０とはライン２１で接続されており、このライン２１は乾燥した汚泥を搬送できるコンベアなどが好ましい。炭化炉３０内部と燃焼炉４０とは、炭化炉３０内で生成する熱分解ガスの配管であるライン３１で接続されており、このライン３１には熱分解ガス中から炭化物を分離除去するサイクロン３２が設けられている。サイクロン３２の底部と炭化炉３０の炭化物出口には、炭化物を排出するライン３３とライン３４とがそれぞれ設けられている。   The dehydrator 10 and the drying furnace 20 are connected by a line 11, and the line 11 is preferably a pipe that can pump sludge by a pump. The drying furnace 20 and the carbonization furnace 30 are connected by a line 21, and the line 21 is preferably a conveyor that can transport dried sludge. The inside of the carbonization furnace 30 and the combustion furnace 40 are connected by a line 31 that is a pipe for pyrolysis gas generated in the carbonization furnace 30. A cyclone 32 for separating and removing carbides from the pyrolysis gas is connected to the line 31. Is provided. A line 33 and a line 34 for discharging carbide are provided at the bottom of the cyclone 32 and the carbide outlet of the carbonization furnace 30, respectively.

燃焼炉４０と炭化炉３０外熱部とはライン４１で接続されており、炭化炉３０外熱部と乾燥炉２０とはライン４２で接続されている。これらライン４１、４２は、燃焼炉４０で発生する燃焼排ガスの配管である。なお、ライン４２には、燃焼排ガスの一部を系外に排気するための配管であるライン４３が設けられている。このライン４３には、炭化炉３０側から順に、空気予熱器４４、熱交換器４７、排ガス処理装置４８、ファン４９、及び煙突５０が設けられている。   The combustion furnace 40 and the carbonization furnace 30 external heating section are connected by a line 41, and the carbonization furnace 30 external heating section and the drying furnace 20 are connected by a line 42. These lines 41 and 42 are piping for combustion exhaust gas generated in the combustion furnace 40. The line 42 is provided with a line 43 that is a pipe for exhausting a part of the combustion exhaust gas out of the system. The line 43 is provided with an air preheater 44, a heat exchanger 47, an exhaust gas treatment device 48, a fan 49, and a chimney 50 in this order from the carbonization furnace 30 side.

乾燥炉２０と燃焼炉４０とは、乾燥炉２０内で発生する排ガスの配管であるライン２２で接続されており、このライン２２には、ライン４３との間で熱交換を行う熱交換器４７が設けられている。また、空気を吸引するファン４５と燃焼炉４０とは、空気配管であるライン４６で接続されており、このライン４６には、ライン４３との間で熱交換を行う空気予熱器４４が設けられている。   The drying furnace 20 and the combustion furnace 40 are connected by a line 22 that is a pipe for exhaust gas generated in the drying furnace 20, and a heat exchanger 47 that performs heat exchange with the line 43 is connected to the line 22. Is provided. The fan 45 that sucks air and the combustion furnace 40 are connected by a line 46 that is an air pipe. The line 46 is provided with an air preheater 44 that exchanges heat with the line 43. ing.

汚泥焼却炉７０は、汚泥を焼却できるものであれば特に限定されないが、ロータリーキルン型や、気泡流動床型、循環流動焼型の焼却炉が好ましい。汚泥焼却炉７０と脱水機１０とは、脱水された下水汚泥の一部を汚泥焼却炉７０に導入するライン７１で接続されている。汚泥焼却炉７０と空気を吸引するファン７２とは、空気配管であるライン７３を介して接続されている。汚泥焼却炉７０と炭化炉３０とは、汚泥焼却炉７０内で発生する汚泥焼却排ガスの配管であるライン７４で接続されている。このライン７４には、汚泥燃焼排ガス中から灰を分離除去する集塵器７５が設けられている。なお必要であれば、炭化炉３０及びサイクロン３２から回収される炭化物６の一部を汚泥焼却炉７０に導入するライン７６を設けることができる。なお、汚泥焼却炉７０は、ボイラを更に備えたものであってもよい。   The sludge incinerator 70 is not particularly limited as long as it can incinerate sludge, but a rotary kiln type, a bubble fluidized bed type, and a circulating fluidized incinerator are preferable. The sludge incinerator 70 and the dehydrator 10 are connected by a line 71 that introduces a part of the dewatered sewage sludge into the sludge incinerator 70. The sludge incinerator 70 and the fan 72 that sucks air are connected via a line 73 that is an air pipe. The sludge incinerator 70 and the carbonization furnace 30 are connected by a line 74 that is a pipe for sludge incineration exhaust gas generated in the sludge incinerator 70. The line 74 is provided with a dust collector 75 for separating and removing ash from the sludge combustion exhaust gas. If necessary, a line 76 for introducing a part of the carbide 6 recovered from the carbonization furnace 30 and the cyclone 32 to the sludge incinerator 70 can be provided. The sludge incinerator 70 may further include a boiler.

以上の構成によれば、先ず、脱水機１０に下水汚泥１を導入し、下水汚泥１の水分が約８０％になるぐらいまで脱水する。なお、本発明で対象となる汚泥は、炭化処理により固体燃料化できる有機性の汚泥であれば下水汚泥に限定されるものではなく、例えば、食品汚泥、製紙汚泥、ビルピット汚泥、消化汚泥、活性汚泥なども適用できる。脱水した下水汚泥は、その一部をライン７１を介して汚泥焼却炉７０に導入し、残部をライン１１を介して乾燥炉２０に導入する。   According to the above configuration, first, the sewage sludge 1 is introduced into the dehydrator 10 and dehydrated until the water content of the sewage sludge 1 is about 80%. The sludge targeted in the present invention is not limited to sewage sludge as long as it is an organic sludge that can be solidified by carbonization. For example, food sludge, papermaking sludge, bill pit sludge, digested sludge, activated sludge Sludge etc. can also be applied. Part of the dewatered sewage sludge is introduced into the sludge incinerator 70 via the line 71, and the remainder is introduced into the drying furnace 20 via the line 11.

乾燥炉２０では、汚泥の水分が約３０％ぐらいになるまで汚泥を乾燥する。乾燥させた汚泥は、ライン２１を介して炭化炉３０に導入する。炭化炉３０では、汚泥を酸素が欠乏した雰囲気下で約３００〜６００℃に加熱して炭化処理を行い、熱分解ガスと固体燃料である炭化物６とを生成する。熱分解ガスは、ライン３１を介してサイクロン３２に導入し、熱分解ガス中の炭化物６を分離除去した後、燃焼炉４０に導入する。炭化物６は、炭化炉３０に設けられたライン３４と、サイクロン４２に設けられたライン３３とから、それぞれ回収する。   In the drying furnace 20, the sludge is dried until the moisture of the sludge becomes about 30%. The dried sludge is introduced into the carbonization furnace 30 via the line 21. In the carbonization furnace 30, the sludge is heated to about 300 to 600 ° C. in an oxygen-deficient atmosphere to perform carbonization to generate pyrolysis gas and carbide 6 that is a solid fuel. The pyrolysis gas is introduced into the cyclone 32 via the line 31, and after separating and removing the carbide 6 in the pyrolysis gas, the pyrolysis gas is introduced into the combustion furnace 40. The carbide 6 is recovered from a line 34 provided in the carbonization furnace 30 and a line 33 provided in the cyclone 42.

燃焼炉４０には、上述した炭化炉３０で生成した熱分解ガスと、ファン５５から吸引して空気予熱器５４で予熱した燃焼用の空気と、乾燥炉２０から排気され熱交換器５７で加熱した排ガスとを導入する。そして、約８００〜１０００℃の温度で燃焼を行う。この燃焼により発生した燃焼排ガスは、ライン４１を介して炭化炉３０外熱部に導入し、炭化処理の熱源として使用する。これにより、炭化処理に必要なエネルギーを十分に得ることができるので、化石燃料の使用量を大幅に削減することができる。但し、燃焼の安定化等のために、助燃料として若干量の化石燃料を燃焼炉４０に供給してもよい。   In the combustion furnace 40, the pyrolysis gas generated in the carbonization furnace 30 described above, combustion air sucked from the fan 55 and preheated by the air preheater 54, exhausted from the drying furnace 20, and heated by the heat exchanger 57. Introduced exhaust gas. And it burns at the temperature of about 800-1000 degreeC. The combustion exhaust gas generated by this combustion is introduced into the heat generating portion of the carbonization furnace 30 through the line 41 and used as a heat source for carbonization. Thereby, sufficient energy required for carbonization can be obtained, so that the amount of fossil fuel used can be greatly reduced. However, a slight amount of fossil fuel may be supplied to the combustion furnace 40 as auxiliary fuel in order to stabilize the combustion.

汚泥焼却炉７０には、上記の脱水汚泥の他、ファン７２からの燃焼用の空気と、燃焼の安定化のための若干量の助燃料（化石燃料）とを導入して、約８００〜９５０℃の温度で脱水汚泥の焼却を行う。なお、汚泥の性状によっては脱水後の含水率が高く、助燃料の使用量を増加させる必要があるときは、ライン７６を介して炭化物６を汚泥燃焼炉７０に供給するか、もしくはライン７７により乾燥汚泥を汚泥焼却炉に供給する。これにより、化石燃料の使用量が増加するのを防止することができる。なお、助燃料の全てを固体燃料である炭化物６でまかなうと、燃焼が安定しない場合があるので、助燃料として液体状の化石燃料を導入することが好ましい。汚泥焼却炉７０で発生した汚泥焼却排ガスは、集塵器７５で灰を分離除去した後、ライン７４を介して炭化炉３０外熱部に導入し、炭化処理の熱源として使用する。   In addition to the above-mentioned dewatered sludge, the sludge incinerator 70 is introduced with combustion air from the fan 72 and a small amount of auxiliary fuel (fossil fuel) for stabilizing the combustion. Incinerate dehydrated sludge at a temperature of ℃. When the moisture content after dehydration is high depending on the properties of the sludge and it is necessary to increase the amount of auxiliary fuel used, the carbide 6 is supplied to the sludge combustion furnace 70 via the line 76 or the line 77 is used. Supply dried sludge to sludge incinerator. Thereby, it can prevent that the usage-amount of a fossil fuel increases. In addition, if all of the auxiliary fuel is covered with the carbide 6 which is a solid fuel, combustion may not be stable, so it is preferable to introduce a liquid fossil fuel as the auxiliary fuel. The sludge incineration exhaust gas generated in the sludge incinerator 70 is separated and removed by the dust collector 75, and then introduced into the heat generator of the carbonization furnace 30 via the line 74 to be used as a heat source for carbonization.

炭化炉３０外熱部から排出された燃焼排ガスの一部は、ライン４２を介して乾燥炉２０に導入される。また、燃焼排ガスの残部は、ライン４３を介して煙突５０から系外に排出される。   A part of the combustion exhaust gas discharged from the outer heat section of the carbonization furnace 30 is introduced into the drying furnace 20 via the line 42. Further, the remainder of the combustion exhaust gas is discharged from the chimney 50 through the line 43 to the outside of the system.

このように、バイオマス資源である下水汚泥１由来の燃焼排ガス及び汚泥燃焼外ガスを炭化処理の熱源として炭化炉３０の外熱部に供給することで、炭化処理に必要なエネルギーを十分に得ることができ、化石燃料の使用量を大幅に削減することができる。また、炭化物６も、カーボンニュートラルなバイオマス資源である下水汚泥１を炭化処理したものであって、かつ、この炭化処理にも化石燃料に代えてバイオマス資源由来の燃料が使用されている。よって、炭化物６を石炭火力発電所（図示省略）での発電燃料として使用することで、化石燃料の使用量を本質的に低減することができるので、ＣＯ2排出量の削減を図ることができる。 Thus, by supplying the combustion exhaust gas derived from the sewage sludge 1 which is a biomass resource and the sludge combustion outer gas as the heat source for the carbonization treatment, the energy necessary for the carbonization treatment can be sufficiently obtained. The amount of fossil fuel used can be greatly reduced. Also, the carbide 6 is obtained by carbonizing the sewage sludge 1 which is a carbon neutral biomass resource, and the fuel derived from the biomass resource is used in this carbonization treatment instead of the fossil fuel. Therefore, by using the carbide 6 as a power generation fuel in a coal-fired power plant (not shown), the amount of fossil fuel used can be essentially reduced, so that CO 2 emissions can be reduced. .

本発明に係る汚泥の炭化処理装置の一実施の形態であって、汚泥焼却炉を設けた場合を示す模式図である。It is one Embodiment of the sludge carbonization apparatus which concerns on this invention, Comprising: It is a schematic diagram which shows the case where a sludge incinerator is provided.

符号の説明Explanation of symbols

１、２ 下水汚泥
６ 炭化物
１０ 脱水機
２０ 乾燥炉
３０ 炭化炉
３２ サイクロン
４０ 燃焼炉
４４ 空気予熱器
４５、４９、７２ ファン
４７ 熱交換器
４８ 排ガス処理装置
５０ 煙突
７０ 汚泥焼却炉
７５ 高温集塵器 1, 2 Sewage sludge 6 Carbide 10 Dehydrator 20 Drying furnace 30 Carbonization furnace 32 Cyclone 40 Combustion furnace 44 Air preheater 45, 49, 72 Fan 47 Heat exchanger 48 Exhaust gas treatment device 50 Chimney 70 Sludge incinerator 75 High temperature dust collector

Claims (6)

汚泥を炭化処理して熱分解ガス及び炭化物を生成させる炭化工程と、汚泥を焼却して汚泥焼却排ガスを発生させる汚泥焼却工程とを含んでなり、前記汚泥焼却排ガスを前記炭化処理の熱源として用いる汚泥の燃料化方法。   A carbonization process for carbonizing sludge to produce pyrolysis gas and carbide; and a sludge incineration process for incinerating sludge to generate sludge incineration exhaust gas, wherein the sludge incineration exhaust gas is used as a heat source for the carbonization process. How to make sludge into fuel. 前記炭化工程で得られる炭化物の一部を、前記汚泥焼却工程で汚泥とともに焼却する請求項１に記載の汚泥の燃料化方法。   The method for converting sludge into fuel according to claim 1, wherein a part of the carbide obtained in the carbonization step is incinerated with sludge in the sludge incineration step. 汚泥を脱水する脱水工程と、脱水した汚泥を乾燥する乾燥工程とを更に含んでなり、乾燥させた汚泥の一部を前記炭化工程で炭化するとともに、乾燥させた汚泥の残部を前記汚泥焼却工程で焼却する請求項１又は２に記載の汚泥の燃料化方法。   The method further comprises a dehydration step for dewatering the sludge and a drying step for drying the dehydrated sludge, and carbonizing a part of the dried sludge in the carbonization step, and the remainder of the dried sludge is incinerated in the sludge The method for converting sludge into fuel according to claim 1 or 2, wherein the fuel is incinerated with a slag. 汚泥を炭化処理して熱分解ガス及び炭化物を生成させる炭化炉と、汚泥を焼却する汚泥焼却炉と、該汚泥焼却炉で発生した汚泥焼却排ガスを熱源として前記炭化炉に供給するラインとを備える汚泥の燃料化装置。   A carbonization furnace that carbonizes sludge to generate pyrolysis gas and carbide, a sludge incinerator that incinerates sludge, and a line that supplies sludge incineration exhaust gas generated in the sludge incinerator to the carbonization furnace as a heat source. Sludge fueling device. 前記炭化炉から前記炭化物の一部を燃料として前記汚泥焼却炉に供給するラインを更に備える請求項４に記載の汚泥の燃料化装置。   The sludge fueling apparatus according to claim 4, further comprising a line for supplying a part of the carbide from the carbonization furnace as fuel to the sludge incinerator. 汚泥を脱水する脱水機と、脱水した汚泥を乾燥する乾燥炉と、該乾燥炉から乾燥させた汚泥の一部を前記炭化炉に供給するラインと、該乾燥炉から乾燥させた汚泥の残部を前記汚泥焼却炉に供給するラインとを更に備える請求項４又は５に記載の汚泥の燃料化装置。   A dehydrator for dewatering sludge, a drying furnace for drying the dewatered sludge, a line for supplying a part of the sludge dried from the drying furnace to the carbonization furnace, and a remainder of the sludge dried from the drying furnace. The sludge fueling apparatus according to claim 4 or 5, further comprising a line that supplies the sludge incinerator.
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