JP3932382B2

JP3932382B2 - Thermal storage combustion processing equipment for volatile organic compounds

Info

Publication number: JP3932382B2
Application number: JP2002248991A
Authority: JP
Inventors: 善規田口; 森原　　淳; 宏一柳; 博川添
Original assignee: Babcock Hitachi KK
Current assignee: Mitsubishi Power Ltd
Priority date: 2002-08-28
Filing date: 2002-08-28
Publication date: 2007-06-20
Anticipated expiration: 2022-08-28
Also published as: JP2004085135A

Description

【０００１】
【発明の属する技術分野】
本発明は揮発性有機化合物の蓄熱燃焼式処理装置に係り、特に、揮発性有機化合物（以下、ＶＯＣともいう）を含むガスを燃焼処理してＶＯＣを除去し、さらにその熱を再生する回転分配式の燃焼蓄熱式のＶＯＣ処理技術に関する。
【０００２】
【従来の技術】
自動車の塗装工場や印刷工場、あるいは金属洗浄工程などからは、トルエン、キシレン、スチレン等の揮発性有機化合物（ＶＯＣ）を含んだ排ガスが発生する。このようなＶＯＣガスは、せいぜい数十ｐｐｍから数％程度の濃度であるが、環境への影響がかなり大きいことが明らかになってきた。
【０００３】
例えば、（１）ＮＯｘと反応して光化学スモッグが発生し、森林が枯死したり人体への悪影響を及ぼす。（２）発ガン性など人体に健康障害を起こさせる。（３）光化学オキシダントの主成分であるオゾンの対流圏内での増加により地球温暖化が生じる。このため、前記工場や工程では、ＶＯＣ排ガスを処理し無害化して大気に排出する動向にある。
【０００４】
従来、ＶＯＣ処理方法としては、直接燃焼式、触媒燃焼式、触媒燃焼／蓄熱方式、濃縮方式、生物処理方式があるが、ＶＯＣ濃度量変動への対応やランニングコスト、あるいは保守保全などを考慮すると、蓄熱触媒燃焼並びに蓄熱燃焼式が有力視されている。
【０００５】
蓄熱触媒燃焼並びに蓄熱燃焼式では、蓄熱体で熱交換することにより補助燃料を極力減らし、ＶＯＣ処理に必要なユーティリティーの低減を図っている。蓄熱式の熱交換に必要なガスの切替装置には、切替弁方式と回転分配弁方式が挙げられる。この中でも回転分配弁方式はコンパクト化が可能であり、ガスを連続的に分配できるという特長を有しているため、広く普及しつつある。
【０００６】
この方法では軸と上部分配室間のシールが重要になる。シールが不十分であると、上部分配室の仕切室間が軸と上部分配室間の隙間を介して導通してしまい被処理ガスが処理済ガス中にリークしてしまう。そのため、シールエアを別途供給し、エアシールによって被処理ガスの漏洩を阻止するものがある（例えば、特許文献１参照。）。
【０００７】
【特許文献１】
特開２００１−７４２２５号公報
【０００８】
【発明が解決する課題】
上記従来の回転分配弁方式による蓄熱式の処理装置には次のような問題点があった。すなわち、被処理ガスを余さず燃焼部に押し込むために、分配器の中空回転軸内から上部分配室へパージガスを分配するが、軸と上部分配室間のシールが不十分であると、上部分配室の仕切室間が軸と上部分配室間の隙間を介して導通してしまい被処理ガスが処理済ガス中にリークしてしまう。ＶＯＣ除去率を高めるためにはこの分配弁のリーク率を以下に下げるかが課題であった。
【０００９】
この部分は摺動も伴うため、樹脂製のブッシュを挿入するが、ガスのリーク経路が多くリーク量が多かった。ブッシュを用いない方法では、軸と上部分配室との間の隙間をできるだけ小さくしななければならないが、軸経の大きな分配弁ではこの隙間管理のために軸や上部分配室の非常に精密な加工が求められ、事実上不可能であった。
【００１０】
また、上記特許文献１に記載された方法では、シールエアの供給装置が別に必要となり、部品点数が増えるとともに構造も複雑化し、コストが高くなるという問題があった。
【００１１】
本発明の課題は、揮発性有機化合物の蓄熱燃焼式処理装置（ＶＯＣ処理装置）において、分配弁のリーク率を下げてＶＯＣ除去率を高めるために、パージガスを用いてメンテナンス性に優れるエアーシールを実現する技術を提供することである。
【００１２】
【課題を解決するための手段】
上記課題を解決するために、本発明は、被処理ガスに含まれる揮発性有機化合物を燃焼あるいは触媒燃焼により浄化処理して処理済ガスにする燃焼部と、前記被処理ガスを加熱したり前記処理済ガスから熱回収したりする固定蓄熱部とを有し、該固定蓄熱部に、前記被処理ガス、前記処理済ガス、および前記被処理ガスを前記燃焼部に押し込むためのパージガスの３種類のガスを切り替えて供給および排出する分配器を備え、該分配器は中空回転軸の周囲に複数の仕切室を有する分配室が固定され、該回転軸に形成したパージガス供給孔と該仕切室に形成した孔とが合致したときに、該回転軸内のパージガスが前記仕切室内に供給される揮発性有機化合物の蓄熱燃焼式処理装置において、前記回転軸のパージガス供給孔は、該回転軸の円周上の互いに１８０度方向に対向する２箇所に配設され、前記回転軸内のパージガスが、前記回転軸の外周と前記分配室の内周との間に形成される隙間を介して前記回転軸の周囲に供給されることを特徴とするものである。
【００１３】
本発明による作用を説明する。分配器の中空回転軸がパージガスを分配する機能を持ち、ＶＯＣを含まないパージガスを中空回転軸の対向した２つのパージガス供給孔から仕切室内に供給し、パージガスは他のガスよりも高圧に保たれているため、仕切室内の被処理ガスを燃焼部に押し込むと共に、回転軸の径方向の両端から供給することにより、回転軸と分配室間の隙間にも流れ込み、この部分で被処理ガスと処理済ガスの間をシールできる。
【００１４】
そのため、被処理ガス昇温に用いられた蓄熱体を通過中の被処理ガスからそのまま処理済ガスに切り替えた場合、蓄熱塔内に残っている未燃の被処理ガスが、処理済ガスに混入することが防がれ、ガス浄化効率の低下を防止できる。
【００１５】
【発明の実施の形態】
本発明の実施形態の概要は、揮発性有機化合物（ＶＯＣ）の蓄熱燃焼式処理装置において、図２に示した分配器１３の中空回転軸１５に、図１に示すように１８０度の径方向に対向して開口部（パージ用開孔２２、シール用開孔２３）を形成したものである。高圧のパージガスを開孔２２から仕切室内の被処理ガスを燃焼部に押し込むと共に、開孔２３から回転軸の周囲に供給して仕切室や隙間をシールできる。そのため、被処理ガスの処理済ガスへのリークが抑制される。
【００１６】
以下、本発明の実施形態の一例を、図面を参照して説明する。本発明が適用される蓄熱燃焼式ＶＯＣ処理装置の全体構成を図２に示す。本装置は、分配器１３、蓄熱室１０、燃焼室１１などで構成される。
【００１７】
分配器１３により分配された被処理ガス１は、連結管８を通り蓄熱室１０に入る。蓄熱室１０は隔壁により複数の塔に分割されており、各塔には熱媒体となる蓄熱体１０ａが装填されている。被処理ガス１は蓄熱塔を通過中、蓄熱体１０ａにより加熱され昇温する。その後、被処理ガス１中の有機ガス成分（ＶＯＣ）は燃焼室を通過する間に完全燃焼し処理される。
【００１８】
また、蓄熱塔においての被処理ガス１の昇温が不十分な場合、燃焼室１１に設置された補助熱源１２（バーナ、電熱ヒータ等）を用いて被処理ガス１を完全燃焼させる。完全燃焼した処理済ガス３は被処理ガス１とは別の蓄熱塔に流入する。高温の処理済ガス３は蓄熱塔を通過中に蓄熱体１０ａによって熱が回収され、蓄熱塔出口では低温となる。蓄熱塔通過後の処理済ガス３は連結管８により分配器１３に導かれる。
【００１９】
これらの動作を連続させるために、被処理ガス１と高温の処理済ガス３とを交互に切り替える必要がある。分配器１３はこのガス入れ替えの機能を持つ。また被処理ガス昇温に用いられた蓄熱体１０ａを、通過中の被処理ガス１からそのまま処理済ガス３に切り替えた場合、蓄熱塔内に残っている未燃の被処理ガス１が、処理済ガス３に混入するため、ガス浄化効率が低下する。
【００２０】
これを防ぐために蓄熱塔が被処理ガスの昇温から、処理済ガスの熱回収に切り替わる間に、ＶＯＣを含まないパージ空気２を蓄熱塔内に送り、蓄熱塔内の未燃被処理ガス１を燃焼炉内に押し込む機構が必要となる。分配器１３はこのパージ空気２を分配する機能も併せ持つ。
【００２１】
分配器１３は、被処理ガスヘッダ４、処理済ガスヘッダ５、回転弁６、上部分配室の仕切室２６により構成される。被処理ガスヘッダ４、処理済ガスヘッダ５は回転弁６により仕切室２６とは隔てられている。回転弁６には、被処理ガス用開口６１、処理済ガス用開口６２が形成されており、それぞれの開口を介して被処理ガスヘッダ４と処理済ガスヘッダ５は、複数の仕切室２６のうちそれぞれ異なる複数の仕切室と連通している。
【００２２】
被処理ガス１は被処理ガスヘッダ４に流入後、回転弁６の被処理ガス用開口６１と連続した上部分配室の仕切室２６に入る。その後、被処理ガス１は連結管８により蓄熱塔に導かれる。また、処理済ガス３は蓄熱塔から連結管８により仕切室２６に導かれた後、回転弁６の処理済ガス用開口６２を通過し、処理済ガスヘッダ５に入り、その後、排ガスダクトを通り排出される。なお、中空回転軸１５はスプロケット１６を介してチェーン１７で回転駆動される。
【００２３】
本発明におけるパージ空気の分配方法を図１に示す。図１は図２のＡ−Ａ断面図である。中空の回転軸１５には、被処理ガス用開口６１と処理済ガス用開口６２の間に位置する角度位置に、互いに１８０°方向の位置にスリット状の開孔２２、２３が形成されている。また、上部分配室内筒２１にも、各仕切室２６ごとにスリット状の開孔２１ａが形成され、両者の開孔が一致したところにパージ空気２が供給されるようになっている。
【００２４】
また、中空回転軸１５の外経と上部分配室内筒２１の内径間には、比較的大きい隙間２５が設けられ、軸１５と内筒２１の両者に精密な加工をしなくても接触しないようになっている。
【００２５】
図１では、回転軸１５に設けられた２つの開孔２２、２３が、上部分配室内筒２１の開孔２１ａに合致し、２つの開孔２２、２３からパージガス２が仕切室２６に供給される。パージガス２は他のガスよりも高圧に保たれているため、回転軸１５と上部分配室内筒２１との間の隙間２５にも流れ込み、この部分でも被処理ガス１と処理済ガス３との間をシールできる。
【００２６】
図３は、図１に示した状態から、回転軸１５や回転弁６がある程度回転し、中空回転軸１５内のパージ空気用のスリット２２、２３が、上部分配室内筒２１のスリット２１ａと合致しない時点での図である。この場合でもパージ空気２が被処理ガスや処理済ガスよりも比較的静圧が高く保たれることを利用し、回転軸と上部分配室内筒間の隙間２５から、積極的にパージガスをリークさせることにより、被処理ガス１の処理済ガス３へのリーク経路はシャットダウンされる。
【００２７】
本実施形態にしたがって、処理流量２００ｍ^３／ｍｉｎの畜熱直接燃焼式ＶＯＣ除去装置を製作した。その結果、被処理ガス中のトルエンを９９％以上の高除去率で処理することができ、８０００時間以上安定して装置を運転することができた。
【００２８】
図４は、回転分配式蓄熱燃焼装置の一参考例の断面図である。本例では、中空回転軸にはパージエア供給用の開孔２２が１箇所のみに形成されている。また、中空回転軸１５の外周面と上部分配室内筒２１の内周面とは摺動を伴うため、その間にブッシュ２４を介在させている。本例では、ガスのリーク経路が多く、１箇所から供給される押込用のパージガスだけでは、十分なリーク防止の効果が得られなかった。
【００２９】
【発明の効果】
上述のとおり本発明によれば、分配器の中空回転軸にパージガス供給用の開孔を対向させて２箇所に形成したので、パージガスをシールガスとして回転軸の周囲に供給できるため、分配弁のリーク率を下げてＶＯＣ除去率が高められ、また、パージガスを用いてメンテナンス性に優れるエアーシールを実現できる。
【図面の簡単な説明】
【図１】本発明の実施例の回転分配式蓄熱燃焼装置の断面図である。
【図２】回転分配式蓄熱燃焼装置の構成図である。
【図３】本発明の実施例の回転分配式蓄熱燃焼装置の断面図である。
【図４】回転分配式蓄熱燃焼装置の一参考例の断面図である。
【符号の説明】
１被処理ガス
２パージガス
３処理済ガス
４被処理ガスヘッダ
５処理済ガスヘッダ
６回転弁
８連結管
１０蓄熱室
１１燃焼室
１２バーナ
１３分配器
１５中空回転軸
２１上部分配室内筒
２１ａパージガス流入用開孔
２２パージガス供給用開孔
２３シール用パージガス供給用開孔
２４ブッシュ
２５隙間
２６仕切室
６１被処理ガス用開口
６２処理済ガス用開口[0001]
BACKGROUND OF THE INVENTION
TECHNICAL FIELD The present invention relates to a heat storage combustion processing apparatus for volatile organic compounds, and in particular, rotational distribution that removes VOC by burning a gas containing a volatile organic compound (hereinafter also referred to as VOC) and regenerates the heat. The present invention relates to a combustion heat storage type VOC processing technique.
[0002]
[Prior art]
An exhaust gas containing a volatile organic compound (VOC) such as toluene, xylene, styrene, or the like is generated from an automobile painting factory, a printing factory, or a metal cleaning process. Such VOC gas has a concentration of several tens of ppm to several percent at most, but it has become clear that the influence on the environment is considerably large.
[0003]
For example, (1) photochemical smog is generated by reacting with NOx, and the forest is killed or has an adverse effect on the human body. (2) Causes human health problems such as carcinogenicity. (3) Global warming occurs due to the increase in the troposphere of ozone, which is the main component of the photochemical oxidant. For this reason, in the said factory and process, it exists in the trend which processes a VOC exhaust gas, detoxifies, and discharges it to air | atmosphere.
[0004]
Conventionally, as a VOC treatment method, there are a direct combustion method, a catalytic combustion method, a catalytic combustion / heat storage method, a concentration method, and a biological treatment method, but taking into account the response to fluctuations in VOC concentration, running costs, maintenance, etc. Thermal storage catalyst combustion and thermal storage combustion type are regarded as promising.
[0005]
In the heat storage catalytic combustion and the heat storage combustion type, the auxiliary fuel is reduced as much as possible by exchanging heat with the heat storage body, and the utility required for the VOC treatment is reduced. Examples of the gas switching device required for the heat storage type heat exchange include a switching valve method and a rotary distribution valve method. Among these, the rotary distribution valve system can be made compact, and has a feature that gas can be continuously distributed, and is therefore widely used.
[0006]
In this method, the seal between the shaft and the upper distribution chamber becomes important. If the seal is insufficient, the partitioning chamber of the upper distribution chamber becomes conductive through the gap between the shaft and the upper distribution chamber, and the gas to be processed leaks into the processed gas. For this reason, there is a type in which seal air is separately supplied and the gas to be treated is prevented from leaking by the air seal (see, for example, Patent Document 1).
[0007]
[Patent Document 1]
Japanese Patent Laid-Open No. 2001-74225
[Problems to be solved by the invention]
The heat storage type processing apparatus using the conventional rotary distribution valve system has the following problems. That is, purge gas is distributed from the hollow rotating shaft of the distributor to the upper distribution chamber in order to push the gas to be treated into the combustion section without any surplus, but if the seal between the shaft and the upper distribution chamber is insufficient, The partition chambers of the distribution chambers conduct through the gap between the shaft and the upper distribution chamber, and the gas to be processed leaks into the processed gas. In order to increase the VOC removal rate, it has been a problem to reduce the leakage rate of the distribution valve to the following.
[0009]
Since this part also involves sliding, a resin bush is inserted, but there are many gas leak paths and a large amount of leak. In the method that does not use a bush, the gap between the shaft and the upper distribution chamber must be made as small as possible. Processing was required and practically impossible.
[0010]
In addition, the method described in Patent Document 1 requires a separate seal air supply device, which increases the number of parts, complicates the structure, and increases the cost.
[0011]
An object of the present invention is to provide an air seal excellent in maintainability by using a purge gas in order to reduce the leakage rate of the distribution valve and increase the VOC removal rate in a heat storage combustion processing device (VOC processing device) of a volatile organic compound. It is to provide the technology to be realized.
[0012]
[Means for Solving the Problems]
In order to solve the above problems, the present invention provides a combustion section that purifies a volatile organic compound contained in a gas to be treated by combustion or catalytic combustion into a treated gas, and heats the gas to be treated. A fixed heat storage unit that recovers heat from the treated gas, and three types of purge gas for pushing the treated gas, the treated gas, and the treated gas into the combustion unit in the fixed heat storage unit And a distributor for supplying and discharging the gas by switching, and a distributor chamber having a plurality of partition chambers is fixed around the hollow rotating shaft, and a purge gas supply hole formed in the rotating shaft and the partition chamber In the regenerative combustion processing apparatus for a volatile organic compound in which the purge gas in the rotating shaft is supplied into the partition when the formed hole matches, the purge gas supply hole of the rotating shaft is a circle of the rotating shaft. Zhoujo Disposed in two locations facing the direction of 180 degrees from one another, purge gas in the rotary shaft, the periphery of the rotating shaft through a clearance formed between the inner periphery of the distribution chamber and the outer periphery of said rotary shaft It is characterized by being supplied to .
[0013]
The operation of the present invention will be described. The distributor's hollow rotary shaft has a function of distributing the purge gas, and purge gas not containing VOC is supplied into the partition chamber from the two purge gas supply holes opposed to the hollow rotary shaft, and the purge gas is kept at a higher pressure than other gases. Therefore, by pushing the gas to be treated in the partition chamber into the combustion section and supplying it from both ends in the radial direction of the rotating shaft, it flows into the gap between the rotating shaft and the distribution chamber. The gap between the spent gas can be sealed.
[0014]
Therefore, when the heat storage body used to raise the temperature of the gas to be processed is switched from the gas to be processed being passed through to the processed gas as it is, the unburned gas to be processed remaining in the heat storage tower is mixed into the processed gas. This prevents the gas purification efficiency from decreasing.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
The outline of the embodiment of the present invention is that a volatile organic compound (VOC) regenerative combustion processing apparatus has a radial direction of 180 degrees as shown in FIG. 1 on the hollow rotating shaft 15 of the distributor 13 shown in FIG. Are formed with openings (a purge opening 22 and a seal opening 23). A gas to be treated in the partition chamber is pushed into the combustion section through the opening 22 through the opening 22 and supplied to the periphery of the rotating shaft through the opening 23 to seal the partition chamber and the gap. Therefore, leakage of the gas to be processed to the processed gas is suppressed.
[0016]
Hereinafter, an example of an embodiment of the present invention will be described with reference to the drawings. FIG. 2 shows an overall configuration of a heat storage combustion type VOC processing apparatus to which the present invention is applied. This apparatus includes a distributor 13, a heat storage chamber 10, a combustion chamber 11, and the like.
[0017]
The gas to be treated 1 distributed by the distributor 13 enters the heat storage chamber 10 through the connecting pipe 8. The heat storage chamber 10 is divided into a plurality of towers by partition walls, and each tower is loaded with a heat storage body 10a serving as a heat medium. The gas 1 to be treated is heated by the heat accumulator 10a and raised in temperature while passing through the heat storage tower. Thereafter, the organic gas component (VOC) in the gas to be treated 1 is completely burned and processed while passing through the combustion chamber.
[0018]
When the temperature of the gas 1 to be processed in the heat storage tower is insufficient, the gas 1 to be processed is completely burned using the auxiliary heat source 12 (burner, electric heater, etc.) installed in the combustion chamber 11. The completely burned treated gas 3 flows into a heat storage tower different from the treated gas 1. The high-temperature treated gas 3 is recovered by the heat storage body 10a while passing through the heat storage tower, and becomes low at the heat storage tower outlet. The treated gas 3 after passing through the heat storage tower is guided to the distributor 13 through the connecting pipe 8.
[0019]
In order to continue these operations, it is necessary to alternately switch between the gas to be processed 1 and the high-temperature processed gas 3. The distributor 13 has a gas replacement function. Moreover, when the heat storage body 10a used for temperature increase of the to-be-treated gas is switched from the to-be-treated gas 1 to the treated gas 3 as it is, the unburned to-be-treated gas 1 remaining in the heat storage tower is treated. Since it mixes with the used gas 3, gas purification efficiency falls.
[0020]
In order to prevent this, while the heat storage tower is switched from the temperature rise of the gas to be treated to the heat recovery of the treated gas, purge air 2 that does not contain VOCs is sent into the heat storage tower, and the unburned untreated gas 1 in the heat storage tower. A mechanism for pushing the gas into the combustion furnace is required. The distributor 13 also has a function of distributing the purge air 2.
[0021]
The distributor 13 includes a gas header 4 to be processed, a processed gas header 5, a rotary valve 6, and a partition chamber 26 of an upper distribution chamber. The treated gas header 4 and the treated gas header 5 are separated from the partition chamber 26 by a rotary valve 6. The rotary valve 6 is formed with an opening 61 for the gas to be processed and an opening 62 for the gas to be processed, and the gas header 4 to be processed and the gas header 5 to be processed are respectively connected to the plurality of partition chambers 26 through the respective openings. It communicates with different compartments.
[0022]
The gas 1 to be processed flows into the gas header 4 to be processed, and then enters the partition chamber 26 of the upper distribution chamber that is continuous with the gas opening 61 of the rotary valve 6. Thereafter, the gas 1 to be treated is led to the heat storage tower by the connecting pipe 8. The treated gas 3 is guided from the heat storage tower to the partition chamber 26 by the connecting pipe 8, then passes through the treated gas opening 62 of the rotary valve 6, enters the treated gas header 5, and then passes through the exhaust gas duct. Discharged. The hollow rotary shaft 15 is rotationally driven by a chain 17 via a sprocket 16.
[0023]
The purge air distribution method in the present invention is shown in FIG. 1 is a cross-sectional view taken along line AA of FIG. The hollow rotating shaft 15 is formed with slit-shaped openings 22 and 23 at positions 180 degrees from each other at an angular position between the gas opening 61 to be processed and the gas opening 62 to be processed. . The upper distribution chamber cylinder 21 is also provided with a slit-shaped opening 21a for each of the partition chambers 26, and the purge air 2 is supplied to the place where both the openings coincide.
[0024]
In addition, a relatively large gap 25 is provided between the outer diameter of the hollow rotary shaft 15 and the inner diameter of the upper distribution chamber cylinder 21 so that both the shaft 15 and the inner cylinder 21 do not come into contact without precise processing. It has become.
[0025]
In FIG. 1, the two openings 22 and 23 provided in the rotating shaft 15 coincide with the opening 21 a of the upper distribution chamber cylinder 21, and the purge gas 2 is supplied to the partition chamber 26 from the two openings 22 and 23. The Since the purge gas 2 is maintained at a higher pressure than the other gases, it also flows into the gap 25 between the rotating shaft 15 and the upper distribution chamber cylinder 21, and this portion is also between the gas 1 to be processed and the processed gas 3. Can be sealed.
[0026]
3 shows that the rotary shaft 15 and the rotary valve 6 rotate to a certain degree from the state shown in FIG. 1, and the slits 22 and 23 for purge air in the hollow rotary shaft 15 coincide with the slit 21a of the upper distribution chamber cylinder 21. It is a figure at the time of not doing. Even in this case, the purge air 2 is actively leaked from the gap 25 between the rotation shaft and the upper distribution chamber cylinder by utilizing the fact that the purge air 2 is kept at a relatively higher static pressure than the gas to be processed and the processed gas. As a result, the leakage path of the gas to be processed 1 to the processed gas 3 is shut down.
[0027]
According to this embodiment, a livestock heat direct combustion type VOC removal device having a treatment flow rate of 200 m ³ / min was manufactured. As a result, toluene in the gas to be treated could be treated with a high removal rate of 99% or more, and the apparatus could be operated stably for 8000 hours or more.
[0028]
FIG. 4 is a cross-sectional view of a reference example of a rotary distribution type heat storage and combustion apparatus. In this example, the hollow rotary shaft is formed with an opening 22 for supplying purge air only at one location. Further, since the outer peripheral surface of the hollow rotary shaft 15 and the inner peripheral surface of the upper distribution chamber cylinder 21 are slid, a bush 24 is interposed therebetween. In this example, there are many gas leak paths, and a sufficient purge prevention effect could not be obtained with only the pushing purge gas supplied from one location.
[0029]
【The invention's effect】
As described above, according to the present invention, the opening for purge gas supply is formed at two locations opposite to the hollow rotary shaft of the distributor, so that purge gas can be supplied as a seal gas around the rotary shaft. The VOC removal rate can be increased by lowering the leak rate, and an air seal excellent in maintainability can be realized using the purge gas.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a rotary distribution type heat storage combustion apparatus according to an embodiment of the present invention.
FIG. 2 is a configuration diagram of a rotation distribution type heat storage combustion apparatus.
FIG. 3 is a cross-sectional view of a rotary distribution type heat storage combustion apparatus according to an embodiment of the present invention.
FIG. 4 is a cross-sectional view of a reference example of a rotation distribution type heat storage combustion apparatus.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Processed gas 2 Purge gas 3 Processed gas 4 Processed gas header 5 Processed gas header 6 Rotary valve 8 Connecting pipe 10 Heat storage chamber 11 Combustion chamber 12 Burner 13 Distributor 15 Hollow rotating shaft 21 Upper distribution chamber cylinder 21a Purge gas inflow opening 22 Purge gas supply opening 23 Seal purge gas supply opening 24 Bush 25 Clearance 26 Partition chamber 61 Opening for gas to be processed 62 Opening for gas to be processed

Claims

A combustion section that purifies a volatile organic compound contained in the gas to be treated by combustion or catalytic combustion into a treated gas, and a fixed heat storage section that heats the gas to be treated or recovers heat from the treated gas And a distributor for supplying and discharging the gas to be treated, the gas to be treated, the treated gas, and a purge gas for pushing the gas to be treated into the combustion part. The distributor is fixed with a distribution chamber having a plurality of partition chambers around a hollow rotary shaft, and the rotation when the purge gas supply hole formed in the rotary shaft matches the hole formed in the partition chamber. In the heat storage combustion processing apparatus for volatile organic compounds in which the purge gas in the shaft is supplied into the partition chamber, the purge gas supply holes of the rotary shaft are located at two locations on the circumference of the rotary shaft that are opposed to each other in the direction of 180 degrees. Is arranged, volatile said purge gas in the rotary shaft, characterized in that it is provided around the rotary shaft through the gap formed between the inner periphery of the distribution chamber and the outer periphery of said rotary shaft -Heat-combustion processing equipment for water-soluble organic compounds.