JP2005274018A - Indirect heating working system and indirect heating working method - Google Patents

Indirect heating working system and indirect heating working method Download PDF

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JP2005274018A
JP2005274018A JP2004087848A JP2004087848A JP2005274018A JP 2005274018 A JP2005274018 A JP 2005274018A JP 2004087848 A JP2004087848 A JP 2004087848A JP 2004087848 A JP2004087848 A JP 2004087848A JP 2005274018 A JP2005274018 A JP 2005274018A
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indirect heating
gas
hot gas
furnace
combustion
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Yoshiyuki Kashiwagi
佳行 柏木
Hiroyuki Ishikawa
博之 石川
Keiji Yasuda
圭児 安田
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Meidensha Corp
Meidensha Electric Manufacturing Co Ltd
Tokai Techno Co Ltd
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Meidensha Corp
Meidensha Electric Manufacturing Co Ltd
Tokai Techno Co Ltd
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E50/00Technologies for the production of fuel of non-fossil origin
    • Y02E50/10Biofuels, e.g. bio-diesel
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00Technologies related to metal processing
    • Y02P10/25Process efficiency
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00Technologies relating to chemical industry
    • Y02P20/141Feedstock
    • Y02P20/143Feedstock the feedstock being recycled material, e.g. plastics

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  • Muffle Furnaces And Rotary Kilns (AREA)
  • Incineration Of Waste (AREA)
  • Gasification And Melting Of Waste (AREA)
  • Coke Industry (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To effectively use a treated gas generating in a direct heat working and prevent the treated gas generated in indirect heating furnaces from leaking. <P>SOLUTION: A hot gas provided in a combustion furnace 3a is fed to the indirect heating furnaces 21 and 22 according to a temperature in the combustion furnace 3a of a gas combustion means 3 in an indirect heat working system. In high temperature operation, the supply of the hot gas to the indirect heating furnaces 21 and 22 is cut off. Thus, the processed gas such as thermally decomposed gas can be prevented from generating from the indirect heating furnaces 21 and 22 in high temperature operation. Also, the hot gas cut off to supply to the indirect heating furnaces 21 and 22 is, for example, discharged to the outdoor after cooling through a heat exchanger 4. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、間接加熱加工方法および間接加熱加工方法であって、従来は廃棄されていた有機性物質(例えば、植物由来の端材物,プラスチック類を含む石油製品由来の高分子物質),無機性物質,各種含水物質(例えば、汚泥,土壌,土砂等)等の各種被加工物等の加工に関するものである。   The present invention relates to an indirect heat processing method and an indirect heat processing method, which have been conventionally discarded organic materials (for example, plant-derived scrap materials, polymer materials derived from petroleum products including plastics), inorganic The present invention relates to processing of various workpieces such as volatile substances and various hydrated substances (eg, sludge, soil, earth and sand).

従来は廃棄されていた例えば有機性物質(例えば、植物由来の端材物,プラスチック類を含む石油製品由来の高分子物質),無機性物質,各種含水物質(例えば、汚泥,土壌,土砂等)等の物質(以下、被加工物と称する)に関しては、間接加熱を利用して乾燥や炭化等の加工が可能な手段(以下、間接加熱手段と称する)を利用して、各種の被加工物中に含有する水分や有機系物質を除去し、これにより得られた乾燥物,炭化物,灰化物,土壌類の浄化物等の加工物を有効利用する試みが成されている。   Conventionally discarded organic materials (for example, plant-derived scrap materials, polymer materials derived from petroleum products including plastics), inorganic materials, various water-containing materials (for example, sludge, soil, earth and sand) With respect to substances such as materials (hereinafter referred to as workpieces), various types of workpieces using means capable of processing such as drying and carbonization using indirect heating (hereinafter referred to as indirect heating means) are used. Attempts have been made to effectively use processed materials such as dried products, carbides, incinerated products, and soil-purified products obtained by removing moisture and organic substances contained therein.

前記の間接加熱手段においては、例えば、回転炉や該回転炉の外周側に配置されるガスダクトを備えた間接加熱炉と、その間接加熱炉内を加熱(例えば、ガスダクト内に熱を供給して加熱)するための熱風炉と、間接加熱加工により発生する熱分解ガス等のガス成分(以下、被処理ガスと称する)を燃焼処理するためのガス燃焼手段と、を構成したものが知られている(例えば、特許文献1)。
特開2000−314511号公報。
In the indirect heating means, for example, a rotary furnace or an indirect heating furnace provided with a gas duct disposed on the outer peripheral side of the rotary furnace, and heating the indirect heating furnace (for example, supplying heat into the gas duct) And a gas combustion means for combusting a gas component (hereinafter referred to as a gas to be treated) such as a pyrolysis gas generated by indirect heating processing is known. (For example, Patent Document 1).
JP 2000-314511 A.

前記の被加工物に応じて、間接加熱加工で発生する被処理ガスには有害成分(例えば、環境汚染や間接加熱加工システムの各手段の破損を引き起こす成分)を含む恐れがある。このため、前記の被処理ガスがたとえ高温であっても、その被処理ガスの熱を例えば前記の間接加熱炉内の加熱に利用(例えば、被処理ガスを熱風炉の熱と共に再利用)することは、安全性等の観点から好ましくないとされている。   Depending on the workpiece, the gas to be processed generated by the indirect heating process may contain harmful components (for example, components that cause environmental pollution or damage to each means of the indirect heating processing system). Therefore, even if the gas to be processed is at a high temperature, the heat of the gas to be processed is used for heating in the indirect heating furnace (for example, the gas to be processed is reused together with the heat of the hot stove). This is not preferable from the viewpoint of safety and the like.

一方、例えば間接加熱加工に要する燃料(例えば、ガス燃焼手段で消費される燃料)を節約し省エネルギー化を図る目的で、前記の被処理ガスをガス燃焼手段の燃焼炉内で燃焼処理し、その燃焼処理によって得られる熱ガスを間接加熱炉に供給し該間接加熱炉内の加熱に利用することが試みられている(例えば、特許文献2,3,4)。
特開2002−263626号公報。 特開2000−183429号公報。 特許第3321669号公報。
On the other hand, for example, in order to save fuel required for indirect heating processing (for example, fuel consumed by the gas combustion means) and to save energy, the above-mentioned gas to be treated is combusted in a combustion furnace of the gas combustion means, Attempts have been made to supply hot gas obtained by combustion treatment to an indirect heating furnace and use it for heating in the indirect heating furnace (for example, Patent Documents 2, 3, and 4).
JP 2002-263626 A. JP 2000-183429 A. Japanese Patent No. 3321669.

図2は、間接加熱加工で発生する被処理ガスをガス燃焼手段で燃焼処理し、その燃焼処理で得られる熱ガスを利用する一般的な間接加熱加工システムの概略説明図を示すものである。   FIG. 2 is a schematic explanatory diagram of a general indirect heating processing system in which a gas to be processed generated by indirect heating processing is combusted by gas combustion means and a hot gas obtained by the combustion processing is used.

図2において、符号2は間接加熱手段を示すものであり、例えば2つの間接加熱炉(以下、第1間接加熱炉,第2間接加熱炉と称する)21,22等を備え、被加工物(例えば、有機性物質,無機性物質,各種含水物質等)を間接加熱加工(乾燥,炭化等)して炭化物等の加工物を得ることが可能なものである。   In FIG. 2, reference numeral 2 indicates an indirect heating means, which includes, for example, two indirect heating furnaces (hereinafter referred to as a first indirect heating furnace and a second indirect heating furnace) 21, 22, etc. For example, an organic substance, an inorganic substance, various water-containing substances, etc.) can be indirectly heated (dried, carbonized, etc.) to obtain a processed product such as a carbide.

第1間接加熱炉21は、回転キルン方式を採用した回転自在の回転炉21aと、その回転炉21aの外周側に位置するダクト等を介して導入される熱ガス(後述の燃焼炉からの熱ガス)により該回転炉21a内を外部から加熱することが可能な外部加熱手段としての加熱ジャケット21bと、前記の回転炉21aを該回転炉21aの両端側にて回転自在に支承する支持ローラ210と、前記の回転炉21aを回転駆動する回転駆動源211と、を具備して成る。なお、前記の熱ガスは、後述のガス燃焼手段3から導入される。   The first indirect heating furnace 21 includes a rotatable rotary furnace 21a adopting a rotary kiln system, and hot gas (heat from a combustion furnace described later) introduced through a duct or the like located on the outer peripheral side of the rotary furnace 21a. A heating jacket 21b as an external heating means capable of heating the inside of the rotary furnace 21a from the outside by gas), and a support roller 210 for rotatably supporting the rotary furnace 21a at both ends of the rotary furnace 21a. And a rotational drive source 211 for rotationally driving the rotary furnace 21a. In addition, the said hot gas is introduce | transduced from the gas combustion means 3 mentioned later.

前記の回転炉21aの一端側には、被加工物を導入するための供給口(図示省略)が設けられ、その他端側には排出口(図示省略)が設けられる。また、回転炉21a内部には、被加工物を撹拌しながら移送するための送り羽根(図示省略)が複数枚具備される。そして、ダクト20から供給された被加工物を前記の供給口側から回転炉21aに導入し、その回転炉21aを回転させることによって、前記の被加工物を撹拌しながら排出口側へ移送することが可能となる。なお、前記ダクト20には、被加工物を投入するホッパー設備201が設けられる。   A supply port (not shown) for introducing a workpiece is provided on one end side of the rotary furnace 21a, and a discharge port (not shown) is provided on the other end side. In addition, a plurality of feed blades (not shown) are provided inside the rotary furnace 21a for transferring the workpiece while stirring. Then, the workpiece supplied from the duct 20 is introduced into the rotary furnace 21a from the supply port side, and the rotary furnace 21a is rotated to transfer the workpiece to the discharge port side while stirring. It becomes possible. The duct 20 is provided with a hopper facility 201 for feeding a workpiece.

第2間接加熱炉22は、前記の第1間接加熱炉21よりも高い温度で間接加熱加工(第1間接加熱炉21にて乾燥された被加工物を熱分解加工)することが可能な手段であり、回転キルン方式を採用した前記第1間接加熱炉21と同様の構成をなし、回転炉22a,加熱ジャケット22b,ダクト22c,支持ローラ220,回転駆動源221を備える。   The second indirect heating furnace 22 can be indirectly heated at a temperature higher than the first indirect heating furnace 21 (the work dried in the first indirect heating furnace 21 is pyrolyzed). It has the same configuration as the first indirect heating furnace 21 adopting the rotary kiln system, and includes a rotary furnace 22a, a heating jacket 22b, a duct 22c, a support roller 220, and a rotation drive source 221.

前記の第1間接加熱炉21および第2間接加熱炉22は、図示するように、前記第1間接加熱炉21の排出口と第2間接加熱炉22の供給口とが連絡するように配置される。この場合、第1間接加熱炉21の排出口と第2間接加熱炉22の供給口には、これら排出口と供給口を覆って連通する連絡ダクト23が設けられる。この連絡ダクト23内には、乾燥した被加工物を第2間接加熱炉22内に誘導するためのガイド23aが設けられる。   As shown in the drawing, the first indirect heating furnace 21 and the second indirect heating furnace 22 are arranged so that the discharge port of the first indirect heating furnace 21 and the supply port of the second indirect heating furnace 22 communicate with each other. The In this case, the discharge port of the first indirect heating furnace 21 and the supply port of the second indirect heating furnace 22 are provided with a communication duct 23 that covers and communicates with the discharge port and the supply port. A guide 23 a for guiding the dried workpiece into the second indirect heating furnace 22 is provided in the communication duct 23.

符号3は、ガス燃焼手段を示すものであり、燃焼炉3a内にて熱ガスを発生させるための燃焼バーナ3bが備えられている。前記の熱ガスは、熱ガス供給用のダクト(以下、熱ガス供給ダクトと称する)31を介して第2間接加熱炉22の加熱ジャケット22bに供給(例えば、後述のブロア42の吸引力を介して供給)され、回転炉22a内が間接的に加熱される。その後、前記の回転炉22a内を加熱した熱ガスは、第1間接加熱炉21の加熱ジャケット21bに供給され、回転炉21a内が間接的に加熱される。   Reference numeral 3 denotes a gas combustion means, which is provided with a combustion burner 3b for generating hot gas in the combustion furnace 3a. The hot gas is supplied to a heating jacket 22b of the second indirect heating furnace 22 through a hot gas supply duct (hereinafter referred to as a hot gas supply duct) 31 (for example, via a suction force of a blower 42 described later). And the inside of the rotary furnace 22a is indirectly heated. Then, the hot gas which heated the inside of the said rotary furnace 22a is supplied to the heating jacket 21b of the 1st indirect heating furnace 21, and the inside of the rotary furnace 21a is heated indirectly.

前記のように熱ガスを用いることにより、第1間接加熱炉21の回転炉21b内に導入される被加工物は乾燥された後、第2間接加熱炉22の回転炉22b内にて間接加熱加工されて炭化物等の加工物となる。   By using the hot gas as described above, the workpiece introduced into the rotary furnace 21b of the first indirect heating furnace 21 is dried and then indirectly heated in the rotary furnace 22b of the second indirect heating furnace 22. Processed into a workpiece such as carbide.

前記の連絡ダクト23には、前記の第1間接加熱炉21内や第2間接加熱炉22内で被加工物から発生する水蒸気や熱分解ガス等の被処理ガスをそれぞれ燃焼炉3a内に移送(図2中の水蒸気の場合は、ブロア(強制搬送ブロア等)51を介して移送)するためのダクト(以下、被処理ガス移送ダクトと称する)24,25が接続される。これら被処理ガス移送ダクト24,25を介して移送した被処理ガスは燃焼炉3a内にて燃焼処理されて無害化し、その燃焼処理の際に発生する熱ガスは前記の第1間接加熱炉21,第2間接加熱炉22に利用される。   In the communication duct 23, the gas to be treated such as water vapor and pyrolysis gas generated from the workpiece in the first indirect heating furnace 21 and the second indirect heating furnace 22 is transferred into the combustion furnace 3a. (In the case of water vapor in FIG. 2, ducts (hereinafter referred to as to-be-processed gas transfer ducts) 24 and 25 for transfer via a blower (forced transfer blower or the like) 51 are connected. The gas to be processed transferred through the gas transfer ducts 24 and 25 is burned in the combustion furnace 3a to be harmless, and the hot gas generated during the combustion process is the first indirect heating furnace 21. The second indirect heating furnace 22 is used.

前記の第1間接加熱炉21,第2間接加熱炉22に利用された熱ガスは、ダクト(以下、利用後熱ガスダクトと称する)50を介し熱交換器(例えば空気を冷却媒体とする気体−気体熱交換方式の熱交換器)4に移送して冷却(例えば、150℃〜200℃程度に冷却)した後、バグフィルタ41に供してからブロア(図2中では、バグフィルタの後段、すなわち第1間接加熱炉21,第2間接加熱炉22に用いられる熱ガスを吸引排気することが可能なブロア)42により煙突43から屋外に開放される。   The hot gas used in the first indirect heating furnace 21 and the second indirect heating furnace 22 passes through a duct (hereinafter referred to as a post-use hot gas duct) 50 as a heat exchanger (for example, a gas having air as a cooling medium). It is transferred to a gas heat exchange system heat exchanger 4 and cooled (for example, cooled to about 150 ° C. to 200 ° C.) and then supplied to the bag filter 41 and then blower (in FIG. 2, the latter stage of the bag filter, that is, The blower 42) capable of sucking and exhausting the hot gas used in the first indirect heating furnace 21 and the second indirect heating furnace 22 is opened to the outside from the chimney 43.

なお、前記の排出される熱ガスの一部は、例えば、ブロア(循環ブロア等)52を介してエゼクタ30に供給し燃焼炉3aのエゼクタ駆動ガスとして利用されることもある。また、前記の熱交換器4が気体−気体熱交換方式の場合には、熱交換器4と燃焼炉3aとの間に、熱交換器4で加熱された冷却媒体(例えば、空気)を燃焼炉3a内に移送するためのダクト(以下、冷却媒体移送ダクトと称する)44を備えることにより、燃焼炉3a内の温度上昇に寄与できる。   A part of the discharged hot gas may be supplied to the ejector 30 via a blower (circulation blower or the like) 52 and used as ejector driving gas for the combustion furnace 3a. When the heat exchanger 4 is a gas-gas heat exchange system, a cooling medium (for example, air) heated by the heat exchanger 4 is combusted between the heat exchanger 4 and the combustion furnace 3a. By providing a duct (hereinafter referred to as a cooling medium transfer duct) 44 for transfer into the furnace 3a, it is possible to contribute to a temperature increase in the combustion furnace 3a.

前記のように加熱ジャケット22a,22b,エゼクタ30に供給される熱ガスや、熱交換器4から屋外に開放される熱ガスには、必要に応じて温度調整用の空気が注入(図2中のエゼクタ30に供給される熱ガスでは、ブロア(エゼクタブロア等)53を介して注入)され、該ガス温度が適宜調整(例えば、加熱ジャケット22bに供給される熱ガスは、600℃〜750℃程度に調整)される。   As described above, air for temperature adjustment is injected into the hot gas supplied to the heating jackets 22a and 22b and the ejector 30 and the hot gas released to the outside from the heat exchanger 4 as required (in FIG. 2). The hot gas supplied to the ejector 30 is injected through a blower (ejector blower or the like) 53, and the gas temperature is appropriately adjusted (for example, the hot gas supplied to the heating jacket 22b is 600 ° C. to 750 ° C. Adjusted).

前記の被処理ガスが可燃性を有し十分発生している場合には、その被処理ガスの燃焼処理により高カロリーの熱が燃焼炉内の温度上昇に寄与するため(すなわち、高温の熱ガスが得られるため)、燃焼バーナ3bの燃料の供給を規制して燃料費を節約することができる。   When the gas to be treated is sufficiently flammable and sufficiently generated, the heat of the high calorie contributes to the temperature rise in the combustion furnace due to the combustion treatment of the gas to be treated (that is, the hot gas having a high temperature). Therefore, the fuel cost can be saved by regulating the fuel supply of the combustion burner 3b.

図2に示したような間接加熱加工システムにおいて、被加工物を間接加熱加工することにより発生する被処理ガス中には、その被加工物に応じて臭気成分が含まれることがある。この臭気成分は、ガス燃焼手段3の燃焼炉内の温度が800℃以上であれば該燃焼炉内にて燃焼処理し十分に分解(無害化)できる。   In the indirect heating processing system as shown in FIG. 2, the gas to be processed generated by indirectly heating the workpiece may include an odor component depending on the workpiece. If the temperature in the combustion furnace of the gas combustion means 3 is 800 ° C. or higher, the odor component can be burned in the combustion furnace and sufficiently decomposed (detoxified).

このため、前記の間接加熱加工システムでは、前記のような臭気成分を十分に分解するために、まず間接加熱手段の間接加熱炉(図2中では回転炉21b内)に被加工物を導入する前に該間接加熱加工システムを所定時間稼動し、燃焼炉内の温度が十分高くなった後(すなわち、燃焼炉内にて臭気成分を分解できる状態になった後)に、前記の被加工物を間接加熱炉へ導入し所望の間接加熱加工を行う方法が採られている。   For this reason, in the indirect heating processing system, in order to sufficiently decompose the odor component as described above, first, the workpiece is introduced into the indirect heating furnace (in the rotary furnace 21b in FIG. 2) of the indirect heating means. Before the indirect heating processing system is operated for a predetermined time and the temperature in the combustion furnace becomes sufficiently high (that is, after the odor component can be decomposed in the combustion furnace), Is introduced into an indirect heating furnace and a desired indirect heating process is performed.

前記のように燃焼炉内の温度が十分上昇するまで間接加熱加工システムを稼動(以下、温度上昇稼動と称する)する場合おいては、燃焼炉内から比較的低い温度(例えば、温度が300℃〜600℃程度の状態)の熱ガスが熱ガス供給ダクトを介して間接加熱炉(図2中では加熱ジャケット21b,22b)に供給されてしまう。   In the case where the indirect heating processing system is operated until the temperature in the combustion furnace sufficiently rises as described above (hereinafter referred to as “temperature increase operation”), a relatively low temperature (for example, a temperature of 300 ° C. from the combustion furnace). The hot gas of about ˜600 ° C. is supplied to the indirect heating furnace (heating jackets 21b and 22b in FIG. 2) through the hot gas supply duct.

したがって、温度上昇稼動の際において、間接加熱炉内に意図しない被加工物が存在(例えば、間接加熱加工の際に間接加熱炉内に付着して残存)する場合、その被加工物の間接加熱加工が行われてしまい、その被加工物から発生する被処理ガス中の臭気成分を前記の燃焼炉内に導入しても十分に分解できないため(すなわち、燃焼炉内は温度が比較的低い状態であり分解が困難であるため)、その臭気成分が分解されずに間接加熱加工システム内を循環(例えば、各ダクトを循環)し、例えば屋外へ漏洩して環境問題を引き起こす恐れがある。   Therefore, when there is an unintended work piece in the indirect heating furnace during temperature rising operation (for example, adhering to the indirect heating furnace and remaining in the indirect heating process), the indirect heating of the work piece is performed. Because the odor components in the gas to be processed generated from the workpiece are processed and cannot be sufficiently decomposed into the combustion furnace (that is, the temperature in the combustion furnace is relatively low) Therefore, the odor component is not decomposed and circulates in the indirect heating processing system (for example, circulates each duct) and leaks to the outside, for example, and may cause environmental problems.

前記のような臭気成分の漏洩を防止する方法として、例えば目的とする量の被加工物に関する間接加熱加工を終えた後、間接加熱炉に残存する被加工物が確実に排出されるまで間接加熱加工システムを所定時間稼動(すなわち、熱ガス供給用ダクトを介して熱ガスを間接加熱炉へ供給)する方法が考えられるが、その被加工物が排出されるまでに長時間を要する場合があり、例えばランニングコスト(間接加熱加工に要する燃料費等)が増加してしまう恐れがある。   As a method for preventing leakage of the odor component as described above, for example, after indirect heating processing for a target amount of workpiece is finished, indirect heating is performed until the workpiece remaining in the indirect heating furnace is reliably discharged. A method of operating the processing system for a predetermined time (that is, supplying hot gas to the indirect heating furnace via the hot gas supply duct) can be considered, but it may take a long time for the workpiece to be discharged. For example, there is a possibility that running cost (fuel cost required for indirect heating processing, etc.) may increase.

本発明は、前記課題に基づいてなされたものであり、間接加熱加工の際に発生する被処理ガスを有効に利用すると共に、間接加熱炉で発生する被処理ガス(例えば、被処理ガス中に含まれる臭気成分)の漏洩を防止することが可能な間接加熱加工システムおよび間接加熱加工方法を提供することにある。   The present invention has been made based on the above-described problem, and effectively uses the gas to be processed generated in the indirect heating process, and also generates the gas to be processed (for example, in the gas to be processed) generated in the indirect heating furnace. An object of the present invention is to provide an indirect heating processing system and an indirect heating processing method capable of preventing leakage of contained odor components.

本発明は、前記課題の解決を図るために、請求項1記載の発明は、被加工物を間接加熱加工することが可能な間接加熱炉を備えた間接加熱手段と、前記の間接加熱炉にて被加工物から発生した被処理ガスをガス燃焼手段に移送するための被処理ガス移送ダクトと、前記のガス燃焼手段の燃焼炉で得られる熱ガスを間接加熱炉に供給することが可能な熱ガス供給ダクトと、前記の間接加熱炉に供給された熱ガスを熱交換器に移送することが可能な利用後熱ガスダクトと、前記の燃焼炉と熱交換器との間を連通し且つ前記熱ガス供給ダクトに対し切替えバルブを介して接続される利用前熱ガスダクトと、を構成したシステムであることを特徴とする。そして、前記切替えバルブは、システムの温度上昇稼動の際に利用前熱ガスダクトを介して燃焼炉の熱ガスを熱交換器に移送し、温度上昇稼動後に熱ガス供給用ダクトを介して燃焼炉の熱ガスを間接加熱炉に供給するように、操作できることを特徴とする。   In order to solve the above-mentioned problems, the present invention provides an indirect heating means including an indirect heating furnace capable of indirectly heating a workpiece, and the indirect heating furnace. It is possible to supply to the indirect heating furnace the gas to be processed for transferring the gas to be processed generated from the workpiece to the gas combustion means and the hot gas obtained in the combustion furnace of the gas combustion means. A hot gas supply duct, a post-use hot gas duct capable of transferring the hot gas supplied to the indirect heating furnace to a heat exchanger, and the combustion furnace and the heat exchanger are communicated with each other, and The system comprises a pre-use hot gas duct connected to a hot gas supply duct via a switching valve. The switching valve transfers the hot gas of the combustion furnace to the heat exchanger via the pre-use hot gas duct during the temperature rise operation of the system, and after the temperature rise operation, the switching valve passes through the hot gas supply duct. It can be operated to supply hot gas to an indirect heating furnace.

請求項2記載の発明は、前記請求項1記載の発明において、前記熱交換器は、冷却媒体として気体を用いた気体−気体熱交換方式であることを特徴とする。   According to a second aspect of the present invention, in the first aspect of the present invention, the heat exchanger is a gas-gas heat exchange system using a gas as a cooling medium.

請求項3記載の発明は、前記請求項1または2記載の発明において、前記の熱交換器と燃焼炉との間を連通し、冷却媒体を燃焼炉へ導入することが可能な冷却媒体用ダクトを備えたことを特徴とする。   According to a third aspect of the present invention, there is provided the cooling medium duct according to the first or second aspect, wherein the heat exchanger and the combustion furnace communicate with each other and the cooling medium can be introduced into the combustion furnace. It is provided with.

請求項4記載の発明は、間接加熱炉を備えた間接加熱手段により被加工物を間接加熱加工し、前記の間接加熱加工の際に被加工物から発生した被処理ガスをガス燃焼手段に移送して燃焼処理し、前記のガス燃焼手段の燃焼炉で得られる熱ガスを熱ガス供給ダクトにより間接加熱炉に供給し、前記の間接加熱炉に供給された熱ガスを利用後熱ガスダクトにより熱交換器に移送するシステムを用いた方法であることを特徴とする。そして、前記システムの温度上昇稼動の際に、前記の燃焼炉と熱交換器との間を連通し且つ前記熱ガス供給ダクトに対し切替えバルブを介して接続される利用前熱ガスダクトにより、燃焼炉の熱ガスを熱交換器に移送し、前記の温度上昇稼動後に、切替えバルブを操作し、熱ガス供給用ダクトを介して燃焼炉の熱ガスを間接加熱炉に供給することを特徴とする。   According to a fourth aspect of the present invention, the workpiece is indirectly heated by the indirect heating means provided with the indirect heating furnace, and the gas to be processed generated from the workpiece during the indirect heating process is transferred to the gas combustion means. The hot gas obtained in the combustion furnace of the gas combustion means is supplied to the indirect heating furnace through the hot gas supply duct, and the hot gas supplied to the indirect heating furnace is used to heat the hot gas through the hot gas duct. It is a method using a system for transferring to an exchanger. When the system rises in temperature, the combustion furnace and the heat exchanger communicate with each other and are connected to the hot gas supply duct via a switching valve to use the hot gas duct before use. The hot gas is transferred to a heat exchanger, and after the temperature rise operation, the switching valve is operated to supply the hot gas of the combustion furnace to the indirect heating furnace through the hot gas supply duct.

請求項5記載の発明は、前記請求項4記載の発明において、前記システムの温度上昇稼動の際に、熱交換器と燃焼炉との間を連通する冷却媒体用ダクトを介して、冷却媒体を燃焼炉へ導入することを特徴とする。   According to a fifth aspect of the present invention, in the invention of the fourth aspect, the cooling medium is supplied via a cooling medium duct that communicates between the heat exchanger and the combustion furnace when the temperature of the system is increased. It is characterized by being introduced into a combustion furnace.

請求項6記載の発明は、前記請求項4または5記載の発明において、前記の温度上昇稼動の後、間接加熱炉内の被加工物から発生する被処理ガスを燃焼炉に導入し燃焼処理することを特徴とする。   The invention described in claim 6 is the invention described in claim 4 or 5, wherein after the temperature raising operation, the gas to be processed generated from the workpiece in the indirect heating furnace is introduced into the combustion furnace for combustion treatment. It is characterized by that.

本発明によれば、ガス燃焼手段の燃焼炉内の温度が十分高くなってから(例えば、被処理ガス中の臭気成分を分解できる程度に高くなってから(例えば、燃焼炉内の温度が800℃以上の際))、その燃焼炉の熱ガスが間接加熱炉に供給されるため、たとえ間接加熱炉に意図しない被加工物が残存していても、間接加熱炉で発生する被処理ガスを確実に燃焼処理することができる。   According to the present invention, after the temperature in the combustion furnace of the gas combustion means becomes sufficiently high (for example, after the temperature becomes high enough to decompose the odor component in the gas to be treated (for example, the temperature in the combustion furnace is 800 ))), Because the hot gas of the combustion furnace is supplied to the indirect heating furnace, even if unintentional workpieces remain in the indirect heating furnace, The combustion treatment can be surely performed.

以上示したように本発明によれば、間接加熱加工の際に発生する被処理ガスに関して、たとえ温度上昇稼動であっても環境汚染等を引き起こすことなく、およびランニングコスト等の増加を招くことなく被処理ガスを確実に燃焼処理できるため、その被処理ガス(例えば、被処理ガス中の臭気成分)の漏洩を防止することが可能となると共に、燃焼炉の熱ガスを有効に利用でき省エネルギー化を図ることが可能となる。   As described above, according to the present invention, the gas to be processed generated in the indirect heating process does not cause environmental pollution and the like, and does not increase the running cost, even if the temperature rise operation. Since the gas to be treated can be reliably burned, leakage of the gas to be treated (for example, odor components in the gas to be treated) can be prevented, and the hot gas of the combustion furnace can be effectively used to save energy. Can be achieved.

以下、本発明の実施の形態における間接加熱加工システムおよび間接加熱加工方法を図面等に基づいて詳細に説明する。なお、図2に示したものと同様なものについては同一符号を付して、その詳細な説明を省略する。   Hereinafter, an indirect heat processing system and an indirect heat processing method in an embodiment of the present invention will be described in detail with reference to the drawings. 2 that are the same as those shown in FIG. 2 are given the same reference numerals, and detailed descriptions thereof are omitted.

本実施の形態は、間接加熱加工システムにおけるガス燃焼手段の燃焼炉内の温度に応じて、その燃焼炉で得られる熱ガスを間接加熱炉に供給(すなわち、臭気成分を分解できる程度に燃焼炉内の温度が上昇した場合に供給)するものであって、温度上昇稼動の際には前記の間接加熱炉に対する熱ガスの供給を遮断することが可能なものである。   In the present embodiment, in accordance with the temperature in the combustion furnace of the gas combustion means in the indirect heating processing system, the hot gas obtained in the combustion furnace is supplied to the indirect heating furnace (that is, the combustion furnace to such an extent that the odor component can be decomposed). When the temperature rises, the supply of hot gas to the indirect heating furnace can be shut off during the temperature raising operation.

これにより、前記の温度上昇稼動の際に間接加熱炉から熱分解ガス等の被処理ガスが発生することを防止できる。また、前記のように間接加熱炉に対する供給が遮断された熱ガスは、例えば熱交換器を介して冷却し屋外へ排出することが可能である。   Thereby, it is possible to prevent generation of a gas to be processed such as a pyrolysis gas from the indirect heating furnace during the temperature raising operation. Moreover, the hot gas from which supply to the indirect heating furnace is shut off as described above can be cooled, for example, via a heat exchanger and discharged outdoors.

図1は、本実施の形態における間接加熱加工システムおよび間接加熱加工方法の一例を示す概略説明図である。図1において、符号10は、ガス燃焼手段3の燃焼炉3a内からの熱ガスを熱交換器4に移送するためのダクト(以下、利用前熱ガスダクトと称する)を示すものである。この利用前熱ガスダクト10は、例えば利用後熱ガスダクト50に対し連通して接続されると共に、熱ガス供給ダクト31に対して切替えバルブ(耐熱性を有し流路を切替えることが可能なバルブ)11を介し連通して接続される。すなわち、燃焼炉3aと熱交換器4との間を連通し、且つ熱ガス供給ダクト31に対し切替えバルブ11を介して接続される。   FIG. 1 is a schematic explanatory diagram illustrating an example of an indirect heat processing system and an indirect heat processing method according to the present embodiment. In FIG. 1, the code | symbol 10 shows the duct (henceforth a heat gas duct before utilization) for transferring the hot gas from the inside of the combustion furnace 3a of the gas combustion means 3 to the heat exchanger 4. In FIG. The pre-use hot gas duct 10 is connected to, for example, the post-use hot gas duct 50 and is connected to the hot gas supply duct 31 with a switching valve (a valve having heat resistance and capable of switching the flow path). 11 to communicate with each other. That is, the combustion furnace 3 a and the heat exchanger 4 are communicated with each other and connected to the hot gas supply duct 31 via the switching valve 11.

前記の切替えバルブ11は、間接加熱加工システムが稼動している際に、前記燃焼炉3a内の温度に応じて該燃焼炉3aで得られる熱ガスの流路を切替えることが可能なものとする。   The switching valve 11 is capable of switching the flow path of the hot gas obtained in the combustion furnace 3a according to the temperature in the combustion furnace 3a when the indirect heating processing system is operating. .

次に、図1に示した間接加熱加工システムの動作例を説明する。まず、間接加熱加工システムの温度上昇稼動において、前記燃焼炉3a内からの熱ガスが利用前熱ガスダクト10を介して熱交換器4に移送されるように、前記切替えバルブ11を操作する。   Next, an operation example of the indirect heat processing system shown in FIG. 1 will be described. First, in the temperature increasing operation of the indirect heating processing system, the switching valve 11 is operated so that the hot gas from the combustion furnace 3a is transferred to the heat exchanger 4 through the pre-use hot gas duct 10.

これにより、温度上昇稼動の際には燃焼炉3a内からの熱ガスが利用前熱ガスダクト10を介して熱交換器4に移送され、バグフィルタ41に供してからブロア(図1中では、バグフィルタの後段)42により煙突43から屋外に開放されるため、たとえ第1間接加熱炉21,第2間接加熱炉22に意図しない被加工物が残存していても、その残存する被加工物が間接加熱加工されることはない(すなわち、被処理ガスが発生することはない)。   As a result, when the temperature rise operation is performed, the hot gas from the combustion furnace 3a is transferred to the heat exchanger 4 through the pre-use hot gas duct 10 and supplied to the bag filter 41 before the blower (in FIG. Since the rear stage of the filter 42 is opened to the outside from the chimney 43, even if unintentional workpieces remain in the first indirect heating furnace 21 and the second indirect heating furnace 22, the remaining workpieces remain. Indirect heat processing is not performed (that is, a gas to be processed is not generated).

また、前記の温度上昇稼動時の熱ガスは、例えば間接加熱手段2等にて吸熱されることなく熱交換器4へ移送されるため、その熱交換器4の冷却媒体を燃焼炉3a内に移送することにより、例えば図2に示したような間接加熱加工システムよりも燃焼炉3a内の温度上昇に寄与できる。   Further, since the hot gas during the temperature rising operation is transferred to the heat exchanger 4 without being absorbed by, for example, the indirect heating means 2 or the like, the cooling medium of the heat exchanger 4 is transferred into the combustion furnace 3a. By transferring, it can contribute to the temperature rise in the combustion furnace 3a rather than the indirect heating processing system as shown in FIG.

前記の温度上昇稼動を経てから、燃焼炉3a内の温度が所定温度以上である場合(被処理ガス中の臭気成分を分解できる温度(例えば、800℃(より具体的には850℃))を超えた場合)には、前記の切替えバルブ11を操作して流路を切替え、前記燃焼炉3a内の熱ガスを熱ガス供給ダクト31により第1間接加熱炉21,第2間接加熱炉22へ供給し、その第1間接加熱炉21,第2間接加熱炉22に対し被加工物を導入(例えば、第1間接加熱炉21,第2間接加熱炉22内の温度が350℃〜650℃程度に昇温してから導入)する。   When the temperature in the combustion furnace 3a is equal to or higher than a predetermined temperature after the above-described temperature rise operation (a temperature at which the odor component in the gas to be treated can be decomposed (for example, 800 ° C. (more specifically, 850 ° C.)) In the case of exceeding, the flow path is switched by operating the switching valve 11, and the hot gas in the combustion furnace 3 a is transferred to the first indirect heating furnace 21 and the second indirect heating furnace 22 through the hot gas supply duct 31. The workpiece is supplied to the first indirect heating furnace 21 and the second indirect heating furnace 22 (for example, the temperature in the first indirect heating furnace 21 and the second indirect heating furnace 22 is about 350 ° C. to 650 ° C. The temperature is raised to 2).

これにより、被加工物の間接加熱加工を施すことができると共に、その間接加熱加工により発生する被処理ガスを燃焼炉3a内にて燃焼処理し無害化することができる。   Thereby, while being able to perform indirect heating processing of a to-be-processed object, the to-be-processed gas generate | occur | produced by the indirect heating processing can be burned in the combustion furnace 3a, and can be made harmless.

なお、前記の切替えバルブ11の設定においては、例えば温度センサを用いて燃焼炉3a内の温度を検出し該検出値に基づいて切替えることが可能である。また、前記のように温度上昇稼動を経て間接加熱加工している間に、燃焼炉3a内の温度が所定温度以下になった場合には、前記の切替えバルブ11を操作して流路を切替えることにより熱ガス(間接加熱手段2内に供給されていた熱ガス)を熱交換器4に移送しても良い。   In the setting of the switching valve 11, the temperature in the combustion furnace 3a can be detected using, for example, a temperature sensor, and switching can be performed based on the detected value. Further, when the temperature in the combustion furnace 3a becomes equal to or lower than the predetermined temperature during the indirect heating process through the temperature raising operation as described above, the flow path is switched by operating the switching valve 11. Accordingly, the hot gas (the hot gas supplied into the indirect heating means 2) may be transferred to the heat exchanger 4.

以上、本発明において、記載された具体例に対してのみ詳細に説明したが、本発明の技術思想の範囲で多彩な変形および修正が可能であることは、当業者にとって明白なことであり、このような変形および修正が特許請求の範囲に属することは当然のことである。   Although the present invention has been described in detail only for the specific examples described above, it is obvious to those skilled in the art that various changes and modifications are possible within the scope of the technical idea of the present invention. Such variations and modifications are naturally within the scope of the claims.

例えば、本実施形態によれば、種々の原料、例えば有機性物質(例えば、植物由来の端材物,プラスチック類を含む石油製品由来の高分子物質),無機性物質,各種含水物質(例えば、汚泥,土壌,土砂等)等の各種被加工物から、乾燥物,灰化物,土壌類の浄化物等の加工物を得ることができる。   For example, according to the present embodiment, various raw materials, for example, organic substances (for example, plant-derived scrap materials, high-molecular substances derived from petroleum products including plastics), inorganic substances, various water-containing substances (for example, Processed products such as dried products, incinerated products, and purified products of soils can be obtained from various processed products such as sludge, soil, and sand.

また、第1間接加熱炉,第2間接加熱炉,ガス燃焼手段,熱交換器等の各処理温度は、例えば被処理物である原料の種類や量に応じて種々変更することができる。   Moreover, each processing temperature, such as a 1st indirect heating furnace, a 2nd indirect heating furnace, a gas combustion means, a heat exchanger, can be variously changed according to the kind and quantity of the raw material which are to-be-processed objects, for example.

本実施の形態における間接加熱加工システムおよび間接加熱加工方法の一例を示す概略説明図。Schematic explanatory drawing which shows an example of the indirect heating processing system and indirect heating processing method in this Embodiment. 一般的な間接加熱加工システムの概略説明図。Schematic explanatory drawing of a general indirect heat processing system.

符号の説明Explanation of symbols

2…間接加熱手段
3…ガス燃焼手段
4…熱交換器
10…利用前熱ガスダクト
11…切替えバルブ
21…第1間接加熱炉
22…第2間接加熱炉
24,25…被処理ガス移送ダクト
31…熱ガス供給ダクト
44…冷却媒体ダクト
50…利用後熱ガスダクト
2 ... Indirect heating means 3 ... Gas combustion means 4 ... Heat exchanger 10 ... Pre-use hot gas duct 11 ... Switching valve 21 ... First indirect heating furnace 22 ... Second indirect heating furnace 24, 25 ... Processed gas transfer duct 31 ... Hot gas supply duct 44 ... Cooling medium duct 50 ... Hot gas duct after use

Claims (6)

被加工物を間接加熱加工することが可能な間接加熱炉を備えた間接加熱手段と、
前記の間接加熱炉にて被加工物から発生した被処理ガスをガス燃焼手段に移送するための被処理ガス移送ダクトと、
前記のガス燃焼手段の燃焼炉で得られる熱ガスを間接加熱炉に供給することが可能な熱ガス供給ダクトと、
前記の間接加熱炉に供給された熱ガスを熱交換器に移送することが可能な利用後熱ガスダクトと、
前記の燃焼炉と熱交換器との間を連通し且つ前記熱ガス供給ダクトに対し切替えバルブを介して接続される利用前熱ガスダクトと、を構成したシステムであって、
前記切替えバルブは、システムの温度上昇稼動の際に利用前熱ガスダクトを介して燃焼炉の熱ガスを熱交換器に移送し、温度上昇稼動後に熱ガス供給用ダクトを介して燃焼炉の熱ガスを間接加熱炉に供給するように、操作できることを特徴とする間接加熱加工システム。
An indirect heating means including an indirect heating furnace capable of indirectly heating the workpiece;
A gas transfer duct to be processed for transferring the gas to be processed generated from the workpiece in the indirect heating furnace to the gas combustion means;
A hot gas supply duct capable of supplying hot gas obtained in the combustion furnace of the gas combustion means to the indirect heating furnace;
A post-use hot gas duct capable of transferring the hot gas supplied to the indirect heating furnace to a heat exchanger;
A pre-use hot gas duct that communicates between the combustion furnace and the heat exchanger and is connected to the hot gas supply duct via a switching valve,
The switching valve transfers the hot gas of the combustion furnace to the heat exchanger via the pre-use hot gas duct during the temperature rise operation of the system, and the hot gas of the combustion furnace via the hot gas supply duct after the temperature rise operation. An indirect heating processing system characterized in that it can be operated so as to be supplied to an indirect heating furnace.
前記熱交換器は、冷却媒体として気体を用いた気体−気体熱交換方式であることを特徴とする請求項1記載の間接加熱加工システム。   The indirect heating processing system according to claim 1, wherein the heat exchanger is a gas-gas heat exchange method using a gas as a cooling medium. 前記の熱交換器と燃焼炉との間を連通し、冷却媒体を燃焼炉へ導入することが可能な冷却媒体用ダクトを備えたことを特徴とする請求項1または2記載の間接加熱加工システム。   The indirect heat processing system according to claim 1, further comprising a cooling medium duct that communicates between the heat exchanger and the combustion furnace and is capable of introducing the cooling medium into the combustion furnace. . 間接加熱炉を備えた間接加熱手段により被加工物を間接加熱加工し、
前記の間接加熱加工の際に被加工物から発生した被処理ガスをガス燃焼手段に移送して燃焼処理し、
前記のガス燃焼手段の燃焼炉で得られる熱ガスを熱ガス供給ダクトにより間接加熱炉に供給し、
前記の間接加熱炉に供給された熱ガスを利用後熱ガスダクトにより熱交換器に移送するシステムを用いた方法であって、
前記システムの温度上昇稼動の際に、前記の燃焼炉と熱交換器との間を連通し且つ前記熱ガス供給ダクトに対し切替えバルブを介して接続される利用前熱ガスダクトにより、燃焼炉の熱ガスを熱交換器に移送し、
前記の温度上昇稼動後に、切替えバルブを操作し、熱ガス供給用ダクトを介して燃焼炉の熱ガスを間接加熱炉に供給することを特徴とする間接加熱加工方法。
The workpiece is indirectly heated by indirect heating means equipped with an indirect heating furnace,
The gas to be treated generated from the workpiece during the indirect heating process is transferred to the gas combustion means for combustion treatment,
The hot gas obtained in the combustion furnace of the gas combustion means is supplied to the indirect heating furnace through the hot gas supply duct,
A method using a system in which the hot gas supplied to the indirect heating furnace is transferred to a heat exchanger by a hot gas duct after use,
During the temperature rise operation of the system, the heat of the combustion furnace is obtained by the pre-use hot gas duct that is connected between the combustion furnace and the heat exchanger and is connected to the hot gas supply duct via a switching valve. Transfer gas to heat exchanger,
An indirect heating processing method characterized by operating a switching valve and supplying hot gas of a combustion furnace to an indirect heating furnace through a hot gas supply duct after the temperature rising operation.
前記システムの温度上昇稼動の際に、熱交換器と燃焼炉との間を連通する冷却媒体用ダクトを介して、冷却媒体を燃焼炉へ導入することを特徴とする請求項4記載の間接加熱加工方法。   The indirect heating according to claim 4, wherein the cooling medium is introduced into the combustion furnace through a cooling medium duct communicating between the heat exchanger and the combustion furnace when the temperature of the system is raised. Processing method. 前記の温度上昇稼動の後、間接加熱炉内の被加工物から発生する被処理ガスを燃焼炉に導入し燃焼処理することを特徴とする請求項4または5記載の間接加熱加工方法。   6. The indirect heat processing method according to claim 4 or 5, wherein after the temperature raising operation, the gas to be processed generated from the work in the indirect heating furnace is introduced into the combustion furnace and burned.
JP2004087848A 2004-03-24 2004-03-24 Indirect heating working system and indirect heating working method Pending JP2005274018A (en)

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