JP4452974B2

JP4452974B2 - Adsorption / desorption device

Info

Publication number: JP4452974B2
Application number: JP2003189613A
Authority: JP
Inventors: 敏明林
Original assignee: Toyobo Co Ltd
Current assignee: Toyobo Co Ltd
Priority date: 2003-07-01
Filing date: 2003-07-01
Publication date: 2010-04-21
Anticipated expiration: 2023-07-01
Also published as: JP2005021796A

Description

【０００１】
【発明が属する技術分野】
本発明は、溶剤含有ガスのバッチ式吸脱着装置の運転方法に関するものである。
【０００２】
更に詳しくは、上記のバッチ式吸脱着装置の運転にあたり、吸着工程と脱着工程とを切り替える時に原ガスの切換ダンパーの動作速度を可変にすることと、切換ダンパーの動作タイミングを変えることで、処理ガスの風量の変動を抑えることが出来る溶剤含有ガスのバッチ式吸脱着装置の運転方法に関するものである。
【０００３】
【従来の技術】
従来、繊維状活性炭、粒状活性炭あるいはゼオライトからなる吸着材を搭載した２基以上の吸着槽を具備しバッチ式吸脱着装置は吸着と脱着を交互に切替えることにより有機溶剤ガスの連続処理を行ってきた。もっとも基本型である吸着槽２基を具備したバッチ式吸脱着装置の基本処理フローを図１に示す。まず溶剤が含有した処理ガスＡは送風機１にて開状態である吸着入口切換ダンパー２を介して通過し吸着工程となっている吸着槽４内の吸着エレメント５にて溶剤が吸着される。その後、開状態である吸着出口切換ダンパー６を介して清浄空気Ｂとなり装置外に排出される。一方、脱着工程となっている吸着槽４での吸着入口切換ダンパー２及び吸着出口切換ダンパー６は閉状態であり、水蒸気弁８が開となり水蒸気Ｃが吸着エレメント５内に噴出し吸着エレメント５に吸着されていた溶剤を脱着する。この脱着された溶剤及び水蒸気は脱着ガス弁９を通って脱着ガスＤとなり、回収装置または燃焼装置などに送られて処理される。吸着工程と脱着工程とを切り替える時のダンパー動作の基本タイムチャートは図３に示すとおりであり、脱着工程が終了し吸着工程に切り替わる吸着槽４でのダンパー動作順序としては吸着出口切換ダンパー６がまずは開き、その後吸着入口切換ダンパー２が開く。さらにもう一方の吸着工程が終了し脱着工程に切り替わる吸着槽の吸着入口切換ダンパー２が閉じ、その後吸着出口切換ダンパー６が閉じる。吸着入口切換ダンパー２が全閉状態から開動作を開始する直後に風が流れ出し、動作が進むにつれ流路抵抗の変化が無くなり処理ガスＡの風量は増加した状態を保つ。逆に吸着入口切換ダンパー２が全開状態から閉動作を開始しても初期は風量の変化は少なく、動作が進むにつれ流路抵抗が増し最終的にこの吸着入口切換ダンパー２は全閉となり処理ガスは流れなくなる。よって、送風機１が一定回転で運転しているので、この切替操作時においては、装置内での流路抵抗が大きく変わることから、この流路抵抗の変化に従って処理ガスＡの風量が変動し、処理ガスＡの吸引元である工程の作業環境の悪化及び製品の不良発生の原因となることから、様々な対策が取られてきた。
【０００４】
簡便な対策としては、吸着入口の閉じる切換ダンパーと開く切換ダンパーの動作を重ね合わせるとともに、これらの吸着入口切換ダンパー２の動作速度を遅くするなどの調整が行われてきたが、この動作速度を遅くすればするほど切替時間が延びることにより、出口濃度が上昇し処理性能が悪くなる可能性がある。ダンパーの駆動には安価で作業性が良いことからエアーシリンダーが一般的に使用されているが、低速での安定性に欠ける。
【０００５】
また、処理ガス風量の変動抑制方法として、吸着槽を増やすことにより、吸着工程から脱着工程に切替わる槽の割合を少なくして、吸脱着槽切替時の通過風速の変動を抑える方法があるが、吸着槽を増やすことから、装置の大型化による設置スペースの増大やコストアップに繋がる等の問題に生じる。
（例えば、特許文献１参照）
【０００６】
【特許文献１】
特許第２６１６７７８号明細書
【０００７】
【発明が解決しようとする課題】
吸脱着装置において吸着工程と脱着工程の切替時に発生する処理ガスの風量変動を抑えることが出来、吸引元である生産工程側の影響を無くすることが出来る吸脱着装置を提供する。
【０００８】
【課題を解決するための手段】
まずは、ダンパーの駆動及び制御方式ですが一般的に多用されている空気圧使用でのエアーシリンダーとエアー電磁弁との組合せからダンパーの駆動用シリンダーを油圧タイプに変更し低速で安定した動作が行えるようにするとともに、空気圧を油圧に変換するユニット（エアーハイドロユニット）を前記油圧シリンダーとエアー電磁弁との間に挿入する。さらに、油圧シリンダーに変更したことによりダンパーの動作が低速のみでは切替時間が延びるため、油圧シリンダーとエアーハイドロユニットとの間にある速度調整器（流量調整弁と逆止弁との並列組合せ）と並列にスキップ弁を取り付けて油圧シリンダーの動作速度を低速及び高速の２段階にする。油圧シリンダーの動作速度の切替は、油圧シリンダーの切替時期の位置に位置検出用スイッチを取り付けてこのスイッチからの信号によるかまたは動作開始からのタイマー作動により切替スキップ弁をＯＮ／ＯＦＦによる。これらを吸着入口ダンパーのみに適用します。
つぎに、動作順序としては、脱着工程が終了し吸着工程に切り替わる吸着槽の吸着出口切換ダンパーがまずは開き、その後もう一方の吸着工程が終了し脱着工程に切り替わる吸着槽の吸着入口ダンパーが閉動作を開始しますが前半はスキップ弁がＯＮであり高速、切替点からは低速に変わります。
脱着工程が終了し吸着工程に切り替わる吸着槽の吸着入口切換ダンパーが低速で開きだしが切替点からの後半はスキップ弁がＯＮとなり、切替点から高速に変わります。また、吸着工程が終了し脱着工程に切り替わる吸着槽の吸着入口ダンパーが閉動作を開始し切替点を通過してから、一定時間が経過した後脱着工程が終了し吸着工程に切り替わる吸着槽の吸着入口切換ダンパーが開動作を開始する。
【０００９】
【発明の実施の形態】
本発明の実施形態の基本処理フローを図２にてダンパー動作のタイムチャートを図４にて説明する。溶剤が含有した処理ガスＡは送風機１にて開状態である吸着入口切換ダンパー２を介して通過し吸着工程となっている吸着槽４内の吸着エレメント５にて溶剤が吸着される。その後、開状態である吸着出口切換ダンパー６を介して清浄空気Ｂとなり装置外に排出される。一方、脱着工程となっている吸着槽４での吸着入口切換ダンパー２及び吸着出口切換ダンパー６は閉状態であり、水蒸気弁８が開となり水蒸気Ｃが吸着エレメント５内に噴出し吸着エレメント５に吸着されていた溶剤を脱着する。この脱着された溶剤及び水蒸気は脱着弁ガス９を通って脱着ガスＤとなり、回収装置または燃焼装置などに送られて処理される。
吸着入口切換ダンパー用シリンダー３を油圧シリンダーとし、空気圧を油圧に変換するユニット（エアーハイドロユニット）を前記油圧シリンダーと圧縮空気電磁弁１１との間に、さらに速度調整器１０（流量調整弁と逆止弁との並列組合せ）と並列にスキップ弁１４を取り付ける。油圧シリンダーの切替時期の位置に位置検出用スイッチを取り付けてこのスイッチからの信号によりスキップ弁１４をＯＮ／ＯＦＦさせる。
吸着工程と脱着工程とを切り替える時のダンパー動作のタイムチャートは図４に示すとおりであり、脱着工程が終了し吸着工程に切り替わる吸着槽４でのダンパー動作順序としては吸着出口切換ダンパー６がまずは開き、もう一方の吸着工程が終了し脱着工程に切り替わる吸着槽４の吸着入口切換ダンパー２が閉動作を開始しますが前半はスキップ弁１４がＯＮであり高速、切替点からは低速に変わります。
吸着工程が終了し脱着工程に切り替わる吸着槽４の吸着入口切換ダンパー２が切替点を通過から一定時間後（０．１〜１０ｓｅｃ）に脱着工程が終了し吸着工程に切り替わる吸着槽の吸着入口切換ダンパー２が低速で開きだし切替点からの後半はスキップ弁１４がＯＮとなり、切替点から高速に変わります。一定時間後脱着工程が終了し吸着工程に切り替わる吸着槽４の吸着出口切換ダンパー６が閉じて、吸脱着工程の切替動作が終了する。
【００１０】
［実施例］
吸着材に繊維状活性炭を使用した基本型である吸着槽２基を具備したバッチ式吸脱着装置において、以下に示す条件により処理ガスの風量変動の測定を行った。処理ガスの風量変動と表す指標として、風量と相関がある送風機１の吸い込み口での静圧（以下吸引静圧とする）を使うこととする。処理風量は１２０ｍ³／ｍｉｎ（ａｔ２０℃）、１槽当たりの吸着材量は４０ｋｇとし、吸着と脱着との切替時間は８分を標準とした。吸着入口ダンパーは上下動作にて流路の開閉を行う形状を選定し、ダンパー口径は直径５００ｍｍ、ダンパーの動作ストロークは６００ｍｍである。
以下に実施例を示す。
【００１１】
［実施例１］
連続運転中において、吸着と脱着との切替後にて安定状態となり処理風量が１２０ｍ³／ｍｉｎ（ａｔ２０℃）である時の吸引静圧を測定すると−９００Ｐａであった。吸引静圧測定を継続し切替中には変動幅は−８７０〜−９３０Ｐａの範囲であった。この実施例での吸引静圧の測定チャートを図９に示す。
【００１２】
［比較例１］本発明を使用しない場合、すなわち吸着入口切換ダンパーの駆動用シリンダーが油圧式ではなく従来の空気圧式である図１のフローで示され、吸着工程と脱着工程とを切り替える時のダンパー動作のタイムチャートが図３に示されるバッチ式吸脱着装置にて、実施例同様に連続運転中において、吸着と脱着との切替後にて安定状態となり処理風量が１２０ｍ３／ｍｉｎ（ａｔ２０℃）である時の吸引静圧を測定すると実施例と同様に−９００Ｐａであった。吸引静圧測定を継続し切替中には変動幅は−７００〜−１１８０Ｐａの範囲であった。この比較例での吸引静圧の測定チャートを図１０に示す。
【００１３】
実施例、比較例の処理結果を下記の表１に示す。
【表１】

【００１４】
【発明の効果】
以上の様に本発明のバッチ式吸脱着装置の運転方法により、吸着工程と脱着工程の切替え時に発生する処理ガスの風量変動を最小限に出来るので、処理ガスの吸引元である工程の作業環境の悪化及び製品の不良発生が抑えられる。また、吸着入口切換ダンパーの駆動機構を変えるのみであることから、装置が大型化にする必要がなく、さらに現在稼働中であるバッチ式吸脱着装置において容易に適用出来る特徴をも持っている。
【図面の簡単な説明】
【図１】バッチ式吸脱着装置の従来の基本処理フロー図
【図２】バッチ式吸脱着装置の実施例の基本処理フロー図
【図３】吸着入口切換ダンパーの従来の基本タイムチャート
【図４】吸着入口切換ダンパーの実施例の基本タイムチャート
【図５】本発明のダンパー動作の速度可変制御にエアーハイドロユニットを使用し、ダンパー下げ方向の高速動作の一例である。
【図６】本発明のダンパー動作の速度可変制御にエアーハイドロユニットを使用し、ダンパー下げ方向の低速動作の一例である。
【図７】本発明のダンパー動作の速度可変制御にエアーハイドロユニットを使用し、ダンパー上げ方向の低速動作の一例である。
【図８】本発明のダンパー動作の速度可変制御にエアーハイドロユニットを使用し、ダンパー上げ方向の高速動作の一例である。
【図９】実施例における吸脱着装置の吸引静圧の測定チャート
【図１０】従来方式における吸脱着装置の吸引静圧の測定チャート
【符号の説明】
Ａ処理ガス
Ｂ清浄空気
Ｃ水蒸気
Ｄ脱着ガス
１送風機
２吸着入口切換ダンパー
３吸着入口切換ダンパー用シリンダー
４吸着槽
５吸着エレメント
６吸着出口切換ダンパー
７吸着出口切換ダンパー用シリンダー
８水蒸気弁
９脱着ガス弁
１０速度調整器
１１圧縮空気電磁弁
１２エアーハイドロユニット
１３オイルタンク
１４スキップ弁[0001]
[Technical field to which the invention belongs]
The present invention relates to an operation method of a batch type adsorption / desorption device for a solvent-containing gas.
[0002]
More specifically, in the operation of the batch type adsorption / desorption device described above, by changing the operation speed of the raw gas switching damper and changing the operation timing of the switching damper when switching between the adsorption process and the desorption process, The present invention relates to a method for operating a batch-type adsorption / desorption device for a solvent-containing gas capable of suppressing fluctuations in gas flow rate.
[0003]
[Prior art]
Conventionally, a batch type adsorption / desorption device equipped with two or more adsorption tanks equipped with an adsorbent made of fibrous activated carbon, granular activated carbon or zeolite has been continuously treating organic solvent gas by alternately switching between adsorption and desorption. It was. FIG. 1 shows a basic processing flow of a batch type adsorption / desorption device equipped with two adsorption tanks, which is the most basic type. First, the processing gas A contained in the solvent passes through the suction inlet switching damper 2 that is open in the blower 1 and is adsorbed by the adsorption element 5 in the adsorption tank 4 in the adsorption process. Thereafter, the air becomes clean air B via the suction outlet switching damper 6 in the open state and is discharged out of the apparatus. On the other hand, the adsorption inlet switching damper 2 and the adsorption outlet switching damper 6 in the adsorption tank 4 in the desorption process are in a closed state, the water vapor valve 8 is opened, and the water vapor C is ejected into the adsorption element 5 to the adsorption element 5. Desorb the adsorbed solvent. The desorbed solvent and water vapor are desorbed gas D through the desorbed gas valve 9 and sent to a recovery device or a combustion device for processing. The basic time chart of the damper operation when switching between the adsorption process and the desorption process is as shown in FIG. 3, and as the damper operation sequence in the adsorption tank 4 where the desorption process ends and switches to the adsorption process, the adsorption outlet switching damper 6 is First, the suction inlet switching damper 2 is opened. Further, the adsorption inlet switching damper 2 of the adsorption tank that is switched to the desorption process after the other adsorption process is completed is closed, and then the adsorption outlet switching damper 6 is closed. Immediately after the suction inlet switching damper 2 starts the opening operation from the fully closed state, the wind begins to flow, and as the operation proceeds, the flow resistance does not change and the flow rate of the processing gas A remains increased. On the contrary, even if the adsorption inlet switching damper 2 starts the closing operation from the fully opened state, the change in the air volume is small at the initial stage, and as the operation proceeds, the flow resistance increases and finally the adsorption inlet switching damper 2 becomes fully closed. Will not flow. Therefore, since the blower 1 is operating at a constant rotation, the flow resistance of the processing gas A fluctuates in accordance with the change in the flow resistance because the flow resistance in the apparatus changes greatly during the switching operation. Various measures have been taken because it causes deterioration of the working environment of the process that is the source of the processing gas A and the occurrence of product defects.
[0004]
As a simple measure, while the operation of the switching damper for closing the suction inlet and the operation of the switching damper for opening are overlapped, adjustments such as slowing the operation speed of the suction inlet switching damper 2 have been performed. The slower the delay, the longer the switching time, which may increase the outlet concentration and deteriorate the processing performance. An air cylinder is generally used for driving a damper because it is inexpensive and has good workability, but lacks stability at low speed.
[0005]
In addition, there is a method for suppressing fluctuations in the passing air speed when switching between adsorption and desorption tanks by increasing the number of adsorption tanks and reducing the ratio of tanks that are switched from the adsorption process to the desorption process as a method of suppressing fluctuations in the processing gas air volume. Since the number of adsorption tanks is increased, problems such as an increase in installation space and an increase in cost due to an increase in the size of the apparatus occur.
(For example, see Patent Document 1)
[0006]
[Patent Document 1]
Japanese Patent No. 2616778 specification
[Problems to be solved by the invention]
Provided is an adsorption / desorption device that can suppress fluctuations in the flow rate of processing gas generated when switching between an adsorption process and a desorption process in the adsorption / desorption apparatus, and can eliminate the influence of the production process side that is a suction source.
[0008]
[Means for Solving the Problems]
First of all, the damper drive and control system is changed from the combination of air cylinder and air solenoid valve, which is commonly used for pneumatics, to a damper type cylinder for driving the damper so that it can operate stably at low speed. In addition, a unit (air hydro unit) for converting air pressure into oil pressure is inserted between the hydraulic cylinder and the air solenoid valve. Furthermore, since the changeover time is extended only when the damper operates at a low speed due to the change to a hydraulic cylinder, a speed regulator (a parallel combination of a flow adjustment valve and a check valve) between the hydraulic cylinder and the air-hydro unit A skip valve is attached in parallel to reduce the operating speed of the hydraulic cylinder in two stages, low and high. The operation speed of the hydraulic cylinder is switched by attaching a position detection switch at the position of the switching timing of the hydraulic cylinder and by turning on / off the switching skip valve by a signal from this switch or by a timer operation from the start of the operation. These only apply to the suction inlet damper.
Next, as the operation sequence, the adsorption outlet switching damper of the adsorption tank that is switched to the adsorption process after the desorption process is completed is opened first, and then the adsorption inlet damper of the adsorption tank that is switched to the desorption process after the other adsorption process is closed However, in the first half, the skip valve is ON, so it changes to high speed and from the switching point to low speed.
The adsorption inlet switching damper of the adsorption tank that switches to the adsorption process after the desorption process is completed starts to open at low speed, but the skip valve turns on in the second half from the switching point, and changes from the switching point to high speed. In addition, the adsorption tank damper, which is switched to the desorption process after the adsorption process is completed, starts the closing operation and passes through the switching point, and then the adsorption tank is switched to the adsorption process after the desorption process is completed after a certain time has passed. The inlet switching damper starts to open.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
The basic processing flow of the embodiment of the present invention will be described with reference to FIG. 2 and the damper operation time chart will be described with reference to FIG. The processing gas A contained in the solvent passes through the suction inlet switching damper 2 that is open in the blower 1 and is adsorbed by the adsorption element 5 in the adsorption tank 4 in the adsorption process. Thereafter, the air becomes clean air B via the suction outlet switching damper 6 in the open state and is discharged out of the apparatus. On the other hand, the adsorption inlet switching damper 2 and the adsorption outlet switching damper 6 in the adsorption tank 4 in the desorption process are in a closed state, the water vapor valve 8 is opened, and the water vapor C is ejected into the adsorption element 5 to the adsorption element 5. Desorb the adsorbed solvent. The desorbed solvent and water vapor pass through the desorption valve gas 9 to become a desorption gas D, which is sent to a recovery device or a combustion device for processing.
The suction inlet switching damper cylinder 3 is a hydraulic cylinder, and a unit for converting air pressure to hydraulic pressure (air hydro unit) is further interposed between the hydraulic cylinder and the compressed air solenoid valve 11, and a speed regulator 10 (opposite to the flow rate adjusting valve). The skip valve 14 is mounted in parallel with the stop valve in parallel). A position detection switch is attached to the position of the switching timing of the hydraulic cylinder, and the skip valve 14 is turned ON / OFF by a signal from this switch.
The time chart of the damper operation when switching between the adsorption process and the desorption process is as shown in FIG. 4. As the damper operation sequence in the adsorption tank 4 where the desorption process is completed and switched to the adsorption process, the adsorption outlet switching damper 6 is the first. The suction inlet switching damper 2 of the adsorption tank 4 which opens and switches to the desorption process after the other adsorption process is finished starts to close, but the skip valve 14 is ON in the first half and changes to a low speed from the switching point. .
Adsorption inlet switching of the adsorption tank 4 after the adsorption process is completed and the adsorption inlet switching damper 2 of the adsorption tank 4 is switched to the desorption process after a certain time (0.1 to 10 sec) after passing through the switching point. The damper 2 opens at a low speed, and in the second half from the switching point, the skip valve 14 is turned on and the switching point changes to a high speed. The adsorption outlet switching damper 6 of the adsorption tank 4 that is switched to the adsorption process after the desorption process after a certain time is closed, and the switching operation of the adsorption / desorption process is completed.
[0010]
[Example]
In a batch type adsorption / desorption apparatus equipped with two adsorption tanks, which are basic types using fibrous activated carbon as an adsorbent, the flow rate variation of the processing gas was measured under the following conditions. As an index representing the flow rate variation of the processing gas, the static pressure (hereinafter referred to as suction static pressure) at the suction port of the blower 1 having a correlation with the flow rate is used. The treatment air volume was 120 m ³ / min (at 20 ° C.), the amount of adsorbent per tank was 40 kg, and the standard switching time between adsorption and desorption was 8 minutes. The suction inlet damper has a shape that opens and closes the flow path by up and down movement, the damper diameter is 500 mm, and the operation stroke of the damper is 600 mm.
Examples are shown below.
[0011]
[Example 1]
During continuous operation, when the suction static pressure was measured when the state became stable after switching between adsorption and desorption and the treatment air flow rate was 120 m ³ / min (at 20 ° C.), it was −900 Pa. While the suction static pressure measurement was continued and changed, the fluctuation range was in the range of −870 to −930 Pa. A measurement chart of the suction static pressure in this example is shown in FIG.
[0012]
[Comparative Example 1] When the present invention is not used, that is, the driving cylinder of the suction inlet switching damper is shown in the flow of FIG. 1 which is not a hydraulic type but a conventional pneumatic type, and when the adsorption process and the desorption process are switched. In the batch type adsorption / desorption device shown in FIG. 3 for the damper operation time chart, during continuous operation as in the example, the state becomes stable after switching between adsorption and desorption, and the processing air volume is 120 m3 / min (at 20 ° C.). When the static suction pressure at a certain time was measured, it was −900 Pa as in the example. While the suction static pressure measurement was continued and changed, the fluctuation range was -700 to -1180 Pa. A measurement chart of the suction static pressure in this comparative example is shown in FIG.
[0013]
The processing results of Examples and Comparative Examples are shown in Table 1 below.
[Table 1]

[0014]
【The invention's effect】
As described above, according to the operation method of the batch type adsorption / desorption apparatus of the present invention, it is possible to minimize the variation in the flow rate of the processing gas generated when switching between the adsorption process and the desorption process. Deterioration of product and occurrence of product defects can be suppressed. Further, since only the drive mechanism of the adsorption inlet switching damper is changed, the apparatus does not need to be enlarged, and further has a feature that can be easily applied to a batch type adsorption / desorption apparatus currently in operation.
[Brief description of the drawings]
FIG. 1 is a flow chart of a conventional basic process of a batch type adsorption / desorption device. FIG. 2 is a flow chart of a basic process of an embodiment of a batch type adsorption / desorption device. FIG. 5 is an example of high-speed operation in the damper lowering direction using an air hydro unit for the variable speed control of the damper operation according to the present invention.
FIG. 6 is an example of a low speed operation in a damper lowering direction using an air hydro unit for the variable speed control of the damper operation of the present invention.
FIG. 7 is an example of a low speed operation in the direction of raising the damper using an air hydro unit for the variable speed control of the damper operation of the present invention.
FIG. 8 is an example of high-speed operation in the direction of raising the damper using an air hydro unit for variable speed control of the damper operation of the present invention.
FIG. 9 is a measurement chart of the suction static pressure of the adsorption / desorption device in the embodiment. FIG. 10 is a measurement chart of the suction static pressure of the adsorption / desorption device in the conventional method.
A Process gas B Clean air C Water vapor D Desorption gas 1 Blower 2 Adsorption inlet switching damper 3 Adsorption inlet switching damper cylinder 4 Adsorption tank 5 Adsorption element 6 Adsorption outlet switching damper 7 Adsorption outlet switching damper cylinder 8 Steam valve 9 Desorption gas valve DESCRIPTION OF SYMBOLS 10 Speed regulator 11 Compressed air solenoid valve 12 Air hydro unit 13 Oil tank 14 Skip valve

Claims

In a batch type adsorption / desorption device that has two or more adsorption tanks and continuously processes the solvent-containing gas by alternately switching the adsorption process and the desorption process, the solvent-containing gas that is switched from the adsorption process to the desorption process was adsorbed. During the closing operation of the adsorption inlet damper of the adsorption tank, the closing operation speed is switched from high speed to low speed, and it is opened during the opening operation of the adsorption inlet damper of the adsorption tank that has desorbed the adsorbed solvent that switches from the desorption process to the adsorption process. A batch type adsorption / desorption device characterized in that, by changing the operation speed from low speed to high speed, fluctuations in the flow rate of the processing gas can be reduced.

After closing speed is switched from the high speed to the low speed during closing operation of the suction damper adsorption tank which has been adsorbing the solvent-containing gas is switched to the desorption step from the adsorption step, the solvent has been adsorbed switched to the adsorption step from the desorption step The batch type adsorption / desorption apparatus according to claim 1, wherein the adsorption inlet damper of the adsorption tank that has been desorbed starts an opening operation.

Batch adsorption-desorption apparatus according to claim 1 or 2, wherein the driving method of adsorbing inlet mouth dampers is by hydraulic cylinders.

The switching of the operating speed of the suction inlet mouth dampers, batch adsorption-desorption apparatus according to claim 3, characterized in that switched by the timer operation from the signal from the position detecting switch of the hydraulic cylinder, or a damper operation start.