JP2013202516A - Adsorption tower and treatment method using adsorption tower - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an adsorption tower capable of preventing generation of time delay in the temperature change of some adsorbent when the adsorbent is cooled or heated, and appropriately demonstrating adsorption and desorption capacity of the adsorbent.SOLUTION: An adsorption tower (1, 2) includes an adsorption tower body (10, 40), an inner tank (20, 45) disposed inside the adsorption tower body (10, 40), and an adsorbent filled inside the inner tank (20, 45). The inner tank (20, 45) includes a shell plate part (21, 46) configuring a sidewall and a ceiling along a length direction, and a bottom plate part (24, 47) provided with an opening where a gas passes through, and the thickness of the shell plate part (21, 46) is set to be smaller than the thickness of the adsorption tower body (10, 40).

Description

  In the present invention, a gas containing an organic component such as a volatile organic compound (VOC) is passed through an adsorbent such as activated carbon to remove the organic component from the gas, and the recovered gas is applied to the adsorbent to which the organic component is adsorbed. The present invention relates to an adsorption tower capable of recovering an adsorbent by collecting organic components from the adsorbent by passing it through.

  Exhaust gas generated in semiconductor factories and chemical factories contains toxic organic components such as volatile organic compounds (VOC), so when exhaust gas is discharged into the atmosphere or reused. In some cases, an exhaust gas is introduced into an adsorption tower filled with an adsorbent such as activated carbon to adsorb an organic component in the exhaust gas to the adsorbent to purify the exhaust gas.

  For example, in Japanese Patent Laid-Open No. 52-147576 (Patent Document 1), by compressing exhaust gas and bringing it into contact with an adsorbent (activated carbon), specific components such as hydrocarbons and solvent components contained in the exhaust gas are disclosed. A method of recovering by adsorbing to an adsorbent is disclosed.

  Specifically, the processing apparatus described in Patent Document 1 has an adsorption tower in which an adsorbent layer is arranged, and supplies a gas to be treated (exhaust gas) to the adsorption tower. In the line, a filter, a compressor, a heat exchanger, a cooler, and a drain separator are arranged. Further, an exhaust pressure recovery device (turbine) and a silencer are arranged in a line for discharging the gas to be processed processed in the adsorption tower.

  In Patent Document 1, when a process for removing a specific organic component from a gas to be processed is performed, the gas to be processed is first introduced into a compressor through a filter and pressurized. By this pressurization, drain that becomes an obstacle when the gas to be treated is adsorbed by the adsorbent is generated in the gas to be treated.

  Subsequently, the compressed gas to be treated is sequentially introduced into the heat exchanger and the cooler and cooled, and the cooled gas to be treated is introduced into the drain separator, and the drain is separated and removed by the drain separator. . Thereafter, the gas to be treated from which the drain has been removed is introduced into the adsorption tower after being heated by the heat exchanger described above to lower the relative humidity.

  By introducing the gas to be treated into the adsorption tower in this way, the specific organic component in the gas to be treated is removed by the adsorbent, and the gas to be treated is purified. In particular, in Patent Document 1, the adsorption capacity of the adsorbent can be increased by introducing the gas to be treated compressed in the above-described compressor into the adsorption tower and removing the organic component, It is said that the adsorption tower can be downsized. Thereafter, the gas to be treated, which has been purified by the adsorption tower, is returned to normal pressure by the exhaust pressure recovery device, and further exhausted after passing through the silencer.

  Patent Document 1 also describes that an adsorbent component adsorbed on the adsorbent is recovered by introducing a desorbent (recovered gas) into the adsorption tower. When recovering the adsorbed component in Patent Document 1, the adsorbed component of the adsorbent is desorbed by stopping the introduction of the gas to be treated and introducing the desorbent into the adsorption tower. Thereafter, the desorbing agent from which the adsorbing component has been desorbed is sent to the separator to collect the adsorbing component, and the desorbing agent is discharged to the outside.

Japanese Patent Application Laid-Open No. 2004-271816 (Patent Document 2) removes an unreacted polymerizable monomer (residual monomer) remaining in polymer particles to be colored particles (toner) in a method for producing a polymerized toner. For this purpose, it is described that a dispersion containing polymer particles is stripped in an evaporator.

  Further, in Patent Document 2, a part of the aqueous dispersion medium of the dispersion liquid discharged from the evaporator in the stripping process, residual monomers, and other volatile substances are introduced into a condenser to obtain liquid components. Monomer and other volatile substances are removed by condensing and separating the liquid component and the gas component in the condensation tank and introducing the separated gas component into the adsorption tower packed with activated carbon. Then, it is described that it is recycled to the evaporator through a blower.

  In addition, when the gas to be treated is introduced into the adsorption tower filled with the adsorbent as in Patent Documents 1 and 2 to purify the gas to be treated, the adsorption amount that the removal target component such as an organic component is adsorbed to the adsorbent. Is known to depend on the temperature of the adsorbent, and the lower the temperature of the adsorbent, the greater the amount of adsorption and the more efficiently the gas to be treated can be processed. In addition, when the adsorbent is regenerated by desorption, the adsorbent is heated to a predetermined temperature.

  With regard to the temperature dependence of such an adsorbent, for example, in Japanese Patent Application Laid-Open No. 2011-152526 (Patent Document 3), a heat transfer pad is arranged in an adsorption tower so as to contact the adsorbent, and a desired heat transfer pad is provided in the heat transfer pad. Heat exchange between the heat medium and the adsorbent by circulating a heat medium controlled to the temperature of the adsorbent, thereby heating the adsorbent in a short time to a temperature at which adsorption and desorption are effectively performed or Techniques for cooling are disclosed.

  However, in the case of the adsorption tower in which the heat transfer pad is arranged in contact with the adsorbent in the adsorption tower as in Patent Document 3, the adsorbent filling space is limited by the heat transfer pad, so that it passes through the adsorbent. There is a drawback that the flow rate of the gas to be processed is reduced, and the processing amount per unit time is reduced.

  By the way, as an apparatus equipped with an adsorption tower for removing a specific organic component from a gas to be treated, conventionally, a horizontal adsorption apparatus (horizontal adsorption tower) in which an adsorption tower is arranged in a horizontal direction, and an adsorption tower are provided. A vertical adsorption device (a vertical adsorption tower) arranged along the vertical direction is known.

  Further, as a form of the adsorption tower, a general type adsorption tower (hereinafter referred to as “active carbon tower”) in which an adsorbent such as activated carbon is directly filled in the main body of the adsorption tower as described in Patent Document 1 and Patent Document 2 described above. , A general type adsorption tower), and an adsorption tower of the type in which an inner tank is installed in the main body of the adsorption tower and the inner tank is filled with an adsorbent as shown in FIG. (Referred to as a type adsorption tower) (Susumu Kokubu, "Recovery by adsorption technology", Chemical Factory, Nikkan Kogyo Shimbun, March 1973, Vol. 17, No. 3, p. 116- 117 (see Non-Patent Document 1)).

  For example, the inner tank type adsorption tower 50 shown in FIG. 7 includes an adsorption tower main body 51 arranged in the horizontal direction, an inner tank 52 arranged in the adsorption tower main body 51, and a filling in the inner tank 52. Adsorbent 53 formed. The adsorption tower 50 has a cylindrical first introduction part 54 for directly introducing the treatment gas into the inner tank 52, and the treatment gas introduced from the first introduction part 54 is uniformly introduced into the inner tank 52. A screen 70 having a large number of holes for distribution, a first discharge part 55 for discharging the gas to be treated that has passed through the adsorbent, and a recovery gas in the adsorption tower main body 51 for desorbing the adsorbent. A second introduction part 56 to be introduced, a cylindrical second discharge part 58 for discharging the recovered gas that has passed through the adsorbent from the inner tank 52, and a condensate (drain) generated by condensation of the recovered gas in the adsorption tower body 51. The first drain discharge part 71 is disposed.

In this case, the first introduction part 54 extends from the inner tank 52 to the outside of the adsorption tower body 51, and a supply pipe 57 for supplying the gas to be treated is connected to the first introduction part 54. Yes. The first discharge part 55 and the second introduction part 56 are formed in the adsorption tower body 51, and the first discharge part 55
Is connected to a discharge pipe 60 for discharging the gas to be treated, and a supply pipe 61 for supplying the recovered gas is connected to the second introduction part 56.

  The second discharge portion 58 is formed to protrude inside the inner tank 52 and extends from the inner tank 52 to the outside of the adsorption tower body 51. The second discharge part 58 is connected to a discharge pipe 59 for discharging the recovered gas. Furthermore, a drain receiving portion 73 that receives a condensate (drain) generated by condensing the recovered gas in the second discharge portion 58 is provided below the portion of the second discharge portion 58 that protrudes into the inner tank 52, and a drain. A second drain discharge part 74 for discharging the condensate collected by the receiving part 73 to the outside is arranged.

  A drain discharge pipe 72 is connected to each of the first drain discharge portion 71 and the second drain discharge portion 74. On the pipes 57, 59, 60, 61, 72, on-off valves 57a, 59a, 60a, 61a, 72a are provided, respectively.

  The inner tank 52 is disposed along the length direction of the body plate part 62 constituting the side wall and the ceiling, and one end of the body plate part 62 in the length direction, and the first introduction part 54 is integrally formed. The first end wall 63, the second end wall 64 disposed at the other end in the length direction of the body plate 62, the lower end of the body plate 62 and the first and second end wall 63, 64 The bottom plate portion 65 is disposed, and the body plate portion 62 is integrally provided with a second discharge portion 58.

  The body plate part 62, the first end face wall part 63, and the second end face wall part 64 in the inner tank 52 are made of a metal plate material, and the bottom plate part 65 has a large number of gas to be processed and recovered gas that can pass through. It is composed of a perforated plate with holes. The inner tank 52 may be installed by fixing or supporting a side edge portion along the length direction of the bottom plate portion 65 on the inner surface of the adsorption tower main body 51, or the inner tank 52 is formed in the adsorption tower main body 51. It may be placed on a base portion 66 formed by assembling the steel 66a in a lattice shape. The inner tank 52 is filled with an adsorbent 53 from the bottom plate portion 65 to a predetermined height in order to reduce the organic components in the gas to be processed to a predetermined concentration or less.

  In such an inner tank type adsorption tower 50, the adsorption tower main body 51 does not directly hold the adsorbent and is disposed outside the inner tank 52 so as to protect the inner tank 52. The thickness of the main body 51 can be made thinner than that of an adsorption tower main body included in a general type adsorption tower such as Patent Document 1 and Patent Document 2, for example.

  The inner tank 52 stably holds a predetermined amount of adsorbent, and can withstand the pressure increase generated in the inner tank 52 when the gas to be treated or the recovered gas is introduced into the inner tank 52. Therefore, it is necessary to set the thickness so that a predetermined strength is ensured. Although the wall thickness of the inner tank 52 is set to be thick to some extent, as will be described later, it can be made thinner than the adsorption tower body of a general type adsorption tower in order to suppress a decrease in adsorption / desorption capability. Met.

  In the adsorption tower 50 configured as described above, when the gas to be processed is processed, the gas to be processed is introduced into the inner tank 52 from the first introduction unit 54 and brought into contact with the adsorbent, whereby Since the organic component in the processing gas is adsorbed and removed by the adsorbent, the gas to be processed is purified. In addition, the gas to be treated that has been purified by passing through the adsorbent is discharged to the outside through the first discharge portion 55.

  On the other hand, when regenerating the adsorbent having adsorbed the organic components, the introduction of the gas to be treated from the first introduction unit 54 is stopped, and the recovered gas (for example, pressurized water vapor) is adsorbed from the second introduction unit 56 to the adsorption tower. The recovery gas is introduced into the main body 51 and fed into the adsorbent through the bottom plate portion (porous plate) 65 of the inner tank 52 while the recovery gas is filled in the adsorption tower main body 51. As a result, the organic component is desorbed from the adsorbent, so that the adsorbent is regenerated.

JP 52-147576 A JP 2004-271816 A JP 2011-152526 A

Susumu Kokubu, “Recovery by adsorption technology”, Chemical Factory, Nikkan Kogyo Shimbun, March 1973, Vol. 17, No. 3, p. 116-117

  In recent years, awareness of environmental issues has increased, and semiconductor factories, chemical factories, and the like have been required to make public announcements regarding the amount of harmful gases, including organic solvents, released to the atmosphere. In addition, the amount of harmful gases released into the atmosphere not only exceeds legal regulations, but also needs to be further reduced from the perspective of risk management to the neighborhood and the general public. Therefore, it is required to reduce the concentration of harmful components in the exhaust gas.

  However, in general-type adsorption towers such as Patent Document 1 and Patent Document 2 in which the adsorbent is directly packed in the adsorption tower body, the adsorption tower body is deformed or damaged when the adsorption tower body is manufactured, moved or installed. In addition to ensuring that the main body of the adsorption tower can stably hold a predetermined amount of adsorbent, and when a gas to be treated is introduced into the main body of the adsorption tower or when a recovery gas (for example, pressurized steam is used) ), It is necessary to set the wall thickness of the adsorption tower body thick so that it can withstand the pressure difference between the inside and outside (atmospheric pressure) of the adsorption tower body. When the wall thickness of the adsorption tower main body is increased, there is a problem that the adsorption / desorption ability of the adsorbent is lowered.

  That is, when the thickness of the main body of the adsorption tower is increased, the heat capacity of the main body of the adsorption tower is increased, so that the main body of the adsorption tower is not easily heated and is not easily cooled. Therefore, when the adsorbent is cooled to increase the adsorption efficiency or when the adsorbent is heated to increase the desorption efficiency, the adsorbent in the adsorption tower body contacts the inner wall surface of the adsorption tower body. And the adsorbent disposed in the vicinity of the inner wall surface of the adsorbent is influenced by the main body of the adsorption tower having a large heat capacity, and for example, is disposed in the central portion away from the inner wall surface of the adsorption tower body. Compared to the adsorbent, the cooling rate and the temperature rising rate were slow, and a time delay occurred in the temperature change of the adsorbent to be cooled or heated.

  Thus, if there is a time lag in the cooling or heating of the adsorbent located in the vicinity of the inner wall surface of the adsorption tower body or in the vicinity of the inner wall surface, the adsorption / desorption capability of the adsorbent is remarkably increased. As a result, the adsorption / desorption ability of the entire adsorbent is also deteriorated.

  For example, the adsorption capacity when introducing and adsorbing acetone gas, which is an organic solvent, into the adsorption tower will be described in detail. In order to improve the adsorption efficiency of the adsorption tower, the adsorbent packed in the adsorption tower is used. After desorption by increasing the desorption vapor to a ratio of 4 to 5 with respect to the desorption solvent weight 1, the gas to be treated is introduced into the adsorption tower with a gas to be treated whose 25% acetone concentration is the lower limit of explosion. When the purification was performed, the adsorption capacity of the adsorption tower was such that the general lower limit concentration of acetone in the gas to be treated discharged from the adsorption tower averaged about 80 to 100 ppm. Although the exhaust gas concentration satisfies the legal exhaust gas regulations, it is required to further reduce the concentration of harmful components as described above.

  On the other hand, in the case of the inner tank type adsorption tower 50 as shown in FIG. 7, when the gas to be treated is introduced into the inner tank 52 or when the recovered gas is introduced into the adsorption tower main body 51, Since the gas to be treated and the recovered gas also enter the space region existing between the adsorption tower main body 51 and the inside of the inner tank 52 and the outside (the space area between the inner tank 52 and the adsorption tower main body 51). The resulting pressure difference is smaller than in the case of an adsorption tower body in a general type adsorption tower as described above.

  Thereby, the thickness of the trunk | drum board part 62 in the inner tank 52, the 1st end surface wall part 63, and the 2nd end surface wall part 64 is set thinner than the thickness of the above-mentioned general type adsorption tower main body. Therefore, the heat capacities of the body plate part 62, the first end face wall part 63, and the second end face wall part 64 can be reduced.

  Therefore, in such an inner tank type adsorption tower 50, as compared with general type adsorption towers such as Patent Document 1 and Patent Document 2, a temperature change caused during cooling or heating depending on a portion where the adsorbent is disposed. Although the time delay of the adsorbent can be reduced, the decrease in the adsorption / desorption capability of the adsorbent can be suppressed, but conventionally, even when such an inner tank 52 is provided, the heat capacity is reduced to prevent the decrease in the adsorption / desorption capability. The thickness of the first end wall 63 and the second end wall 64 is not reduced for the purpose, or the body plate 62, the first end wall 63, and the second end wall 64 are thick members. In addition, since a thick reinforcing member is attached or the like, the adsorption / desorption ability is deteriorated due to the time delay of the temperature change in the adsorbent, and there is room for improvement.

  In addition, the inner tank 52 of the adsorption tower 50 shown in FIG. 7 is thinner than a general type adsorption tower body and easily changes in temperature. Are alternately repeated, a thermal stress is generated between the base portion 66 on which the inner tub 52 is placed and a member for fixing the inner tub 52, and the inner tub 52 is cracked or cracked. There was a thing.

  Thus, when a crack or a crack occurs in the inner tank 52, since the adsorption tower main body 51 exists outside the inner tank 52, the gas to be treated and the recovered gas will not leak to the outside, but the crack or crack is present. The problem is that the gas to be treated leaks from the portion where the gas is generated and is discharged from the first discharge part 55 without appropriately passing through the adsorbent, and the adsorption capacity of the adsorption tower 50 is reduced. was there.

  For example, when a gas to be treated having an acetone concentration of 25%, which is the lower limit of explosion, is introduced into the adsorption tower 50 shown in FIG. 7 and adsorbed, the adsorption / desorption ability equal to or higher than that of the general type adsorption tower 50 described above is obtained. Although it is possible to obtain a short-pass problem when the inner tank 52 is cracked or cracked as described above, it has occurred in the inner tank 52 although it does not exceed legal exhaust gas regulations. Even if cracks and cracks are small, it is difficult to maintain the adsorption capacity that makes the exhaust gas concentration about 80 to 100 ppm as described above. It was set to about 150-200 ppm.

  The present invention has been made in view of the above-described conventional problems, and a specific object thereof is to prevent a partial time delay from occurring in the temperature change of the adsorbent during cooling or heating of the adsorbent. In order to effectively purify the gas to be treated by properly exerting the adsorption / desorption capability of the adsorbent, it is also possible to prevent the inner tank from cracking or cracking even if the adsorbent is repeatedly cooled and heated. An object of the present invention is to provide a possible adsorption tower and a treatment method using the adsorption tower.

In order to achieve the above object, the adsorption tower provided by the present invention has, as a basic structure, a metal adsorption tower body provided with an internal space, and a metal inside arranged in the adsorption tower body. A tank and an adsorbent filled in the inner tank, and the inner tank is disposed on a body plate part constituting a side wall and a ceiling and a lower end part of the body plate part, and an opening through which gas passes. And purifying the gas to be treated by adsorbing a predetermined organic component contained in the gas to be treated by the adsorbent by introducing the gas to be treated into the inner tank. And an adsorption tower for recovering the adsorbent by recovering the organic component from the adsorbent by introducing a recovery gas into the inner tank, wherein the thickness of the barrel plate portion is the adsorption tower. The main feature is that it is set thinner than the thickness of the tower body.

In the adsorption tower according to the present invention, the adsorption tower main body and the inner tank have a horizontal structure arranged along a horizontal direction, and the side walls of the body plate portion are formed by a pair of wall bodies facing each other. The ceiling of the body plate part is arranged between upper ends of the pair of wall bodies, and the inner tank is a pair of end face walls arranged at both ends in the horizontal direction of the body plate part. It is preferable that each end surface wall part is comprised by the one metal flat plate which is thicker than the said trunk | drum board part, and has thickness thinner than the said adsorption tower main body.
In this case, it is more preferable that a reinforcing member continuous along the circumferential direction orthogonal to the length direction of the body plate portion is fixed to the outer peripheral surface of the body plate portion by spot welding.

In the adsorption tower according to the present invention, the adsorption tower main body and the inner tank have a bowl-shaped structure arranged along the vertical direction, and the side wall of the body plate portion is formed in a cylindrical shape. It is comprised by the wall body, and the said ceiling of the said trunk | drum board part may be comprised by the cover body which plugs up the upper end part of the said wall body.
In this case, it is more preferable that a reinforcing member continuous along the circumferential direction orthogonal to the central axis direction of the body plate portion is fixed to the outer peripheral surface of the body plate portion by spot welding.
In the present invention, the reinforcing member includes a first plate piece portion having a contact surface with an outer peripheral surface of the body plate portion, and a second plate piece portion rising from the first plate piece portion, The thickness of the second plate piece portion is preferably set so that the thermal expansion / contraction speed of the reinforcing member is substantially the same as the thermal expansion / contraction speed of the body plate portion, and further, the first and second It is particularly preferable that the thickness of the plate piece portion is set to a dimension that is 1 mm or more larger than the thickness of the body plate portion.

  In the adsorption tower of the present invention, in the adsorption tower main body, a base part is placed, on which the inner tank is placed, and a gas can be circulated to the bottom plate part of the inner tank, the base part It is preferable that a sliding means for sliding the bottom plate portion with respect to the base portion during thermal expansion and contraction of the bottom plate portion is provided between the bottom plate portion and the bottom plate portion of the inner tank.

  In the adsorption tower of the present invention, a first introduction part that introduces the gas to be treated into the inner tank, and a first gas that passes through the adsorbent and from which the organic component has been removed are discharged. A discharge part; a second introduction part for introducing the recovered gas into the adsorption tower body; and a second discharge part for discharging the recovered gas that has passed through the adsorbent and recovered the organic component from the adsorbent. The first introduction part and the second discharge part are directly connected to the inner tank from the outside through the adsorption tower body, and the first introduction part, the second discharge part, and the adsorption tower The first thermal stress relaxation means configured by interposing an elastically deformable seal member between the main body and / or the first introduction part and the second discharge part can be elastically deformable and extendable. It is preferable that the second thermal stress relaxation means provided with a flexible tube is provided.

  Further, the adsorption tower of the present invention is arranged in the inner tank, and perforates a plate that rectifies before introducing the gas to be treated into the adsorbent, and is fixed to the inner wall surface of the inner tank, and supports the porous plate. It is preferable to have a supporting member.

  In this case, the support member is disposed between the plurality of first support portions fixed to the inner wall surface and at least two of the first support portions and relatively to each first support portion. It is particularly preferable to have a second support portion that is held displaceably.

  Moreover, the treatment method using the adsorption tower provided by the present invention introduces a gas to be treated containing a volatile organic compound into the inner tank of the adsorption tower having the above-described configuration, thereby providing the volatile property. The volatile organic compound is removed from the adsorbent by adsorbing an organic compound on the adsorbent to purify the gas to be treated, and introducing a recovery gas into the inner tank of the adsorption tower. The main feature is that it comprises recovering and regenerating the adsorbent.

  The adsorption tower which concerns on this invention has an adsorption tower main body, the inner tank distribute | arranged in the adsorption tower main body, and the adsorption agent with which the inner tank was filled. Further, the inner tank includes at least a body plate portion that constitutes the side wall and the ceiling, and a bottom plate portion disposed at a lower end portion of the body plate portion, and the thickness of the body plate portion is the thickness of the adsorption tower body. It is set thinner.

  As described above, the thickness of the body plate portion is set to be smaller than the thickness of the adsorption tower body, so that the heat capacity of the body plate portion is reduced, and the entire body plate portion is easily and relatively uniformly heated. Can be changed. For this reason, it is difficult for thermal stress to occur in the body plate part itself during thermal expansion and contraction of the body plate part, and when the organic component is adsorbed or desorbed by cooling or heating the adsorbent, the body plate part is the same as the adsorbent. Since the temperature can be changed as described above, the portion that is in contact with the inner wall surface of the body plate portion and the adsorbent disposed in the vicinity of the inner wall surface are separated from the inner wall surface of the body plate portion. It is possible to prevent a time delay from occurring in the temperature change of the adsorbent as in the prior art by changing the temperature in the same manner as the adsorbent disposed in the.

  Thereby, since the whole adsorption agent with which the inner tank is filled can be cooled or heated to desired temperature in a short time, it becomes possible to exhibit the adsorption / desorption capability of the whole adsorption agent appropriately. That is, when the gas to be treated is introduced into the inner tank and a predetermined organic component is adsorbed by the adsorbent, for example, by cooling the adsorbent with the gas to be treated in order to increase the adsorption efficiency of the adsorbent, Since the temperature of the entire adsorbent, including the adsorbent in contact with the inner wall surface of the plate, can be lowered to a predetermined temperature in a short time, organic components in the gas to be treated can be efficiently adsorbed to the adsorbent. Thus, the concentration of the organic component in the gas to be treated that has been purified by the adsorbent can be greatly reduced as compared with the conventional case.

  In addition, when introducing the recovery gas to the adsorbent that has adsorbed the organic component to desorb the organic component, the adsorbent is heated by, for example, the recovered gas at the same time that the adsorbent is desorbed in order to increase the efficiency of the adsorbent. By heating, the temperature of the entire adsorbent including the adsorbent that is in contact with the inner wall surface of the body plate portion can be raised to a predetermined temperature in a short time. The adsorption capacity of the adsorbent can be stably recovered by desorption.

  In the adsorption tower of the present invention, the adsorption tower body and the inner tank have a horizontal structure arranged along the horizontal direction, and the side walls of the body plate portion are a pair of walls facing each other. The ceiling of the trunk plate portion is arranged between upper ends of the pair of wall bodies, and the inner tank is a pair of horizontal ends of the trunk plate portion. Each of the end surface wall portions is composed of a single metal flat plate having a thickness larger than that of the body plate portion and thinner than that of the main body of the adsorption tower. Thus, by setting the wall thickness of each end surface wall part to be thicker than the body plate part, the end surface wall part can stably secure a required strength.

In addition, although the wall thickness of the end face wall portion is thicker than that of the body plate portion, it is thinner than that of the adsorption tower body. . As a result, when the entire adsorbent is cooled or heated, the portion in contact with the inner wall surface of the end surface wall portion and the adsorbent in the vicinity of the inner wall surface are affected by the end surface wall portion. Since it can cool or heat to desired temperature in a short time, the fall of adsorption / desorption capability can be suppressed.

  In particular, in the present invention, the adsorbent receives from the end face wall during cooling or heating of the adsorbent by making the area where the adsorbent contacts the end face wall smaller than the area where the adsorbent contacts the body plate. By reducing the magnitude of the influence relatively, it is possible to more effectively suppress a decrease in the adsorption / desorption ability of the entire adsorbent.

  Moreover, in the adsorption tower of this invention, the reinforcement member continuous along the circumferential direction orthogonal to the length direction of a trunk | drum plate part is being fixed to the outer peripheral surface of the trunk | drum plate part in an inner tank by spot welding. Thereby, even if the thickness of the body plate portion is reduced as described above, the strength of the body plate portion can be increased by the reinforcing member, so that a predetermined amount of the adsorbent is stably held in the inner tank. Even if the pressure in the inner tank rises when the gas to be treated is introduced into the inner tank, the deformation of the body plate portion can be effectively suppressed.

  In particular, since the reinforcing member is fixed to the outer peripheral surface of the body plate portion by spot welding as described above, for example, when the adsorbent is cooled or heated, the amount of thermal expansion and contraction of the body plate portion and the reinforcing member Even if there is a difference in the amount of thermal expansion and contraction, the thermal stress generated between the body plate portion and the reinforcing member is welded compared to, for example, the case where the reinforcing member is continuously welded to the outer peripheral surface of the body plate portion. Since the residual stress at the time of fixation is small, it can be reduced. Therefore, even if the cooling at the time of adsorption of the adsorbent and the heating at the time of desorption are alternately performed and the cooling and heating of the body plate portion and the reinforcing member are repeated, it becomes difficult for the body plate portion to be cracked or cracked, As described above, it is possible to prevent the problem of a short pass of the gas to be processed.

  On the other hand, in the adsorption tower of the present invention, the adsorption tower body and the inner tank have a bowl-shaped structure arranged along the vertical direction, and the side wall of the body plate portion is formed in a cylindrical shape. It is comprised by the wall body, and the said ceiling of the said trunk | drum board part may be comprised by the cover body which plugs up the upper end part of the said wall body. Since the side wall of the body plate portion is formed in a cylindrical shape in this way, the strength of the body plate portion is increased, and it becomes easy to introduce the gas to be processed or the recovered gas into the adsorbent substantially uniformly. Gas purification processing and adsorbent regeneration processing can be performed more efficiently.

  In this case, a reinforcing member continuous along the circumferential direction perpendicular to the central axis direction of the body plate portion is fixed to the outer peripheral surface of the body plate portion in the inner tub by spot welding. Since the strength of the body plate portion can be further increased by such a reinforcing member, a predetermined amount of the adsorbent is stably held in the inner tank, and when the gas to be treated is introduced into the inner tank, the inner tank Even if the internal pressure rises, deformation of the body plate portion can be stably suppressed. Furthermore, since the reinforcing member is fixed by spot welding, the thermal stress generated between the body plate portion and the reinforcing member can be reduced, so that cooling during adsorption and heating during desorption are alternately performed. Even if it is performed, cracks and cracks are less likely to occur in the body plate portion.

  In the present invention, the reinforcing member has a first plate piece portion having a contact surface with the outer peripheral surface of the body plate portion, and a first plate so that the cross section thereof has, for example, a substantially L shape or a substantially T shape. And a second plate piece rising from the one part. Further, in this case, the thickness of the first and second plate pieces is, for example, 1 mm larger than the thickness of the trunk plate portion so that the thermal expansion / contraction speed of the reinforcing member is substantially the same as the thermal expansion / contraction speed of the trunk plate portion. The size is set to be smaller than the enlarged size. If the reinforcing member is configured in this way, the strength of the body plate portion can be stably increased, and the stress generated between the body plate portion and the first and second plate pieces during thermal expansion and contraction can be reduced. Therefore, even if cooling and heating of the trunk plate portion and the reinforcing member are alternately repeated, it is possible to make it difficult to generate cracks and cracks in the trunk plate portion.

Moreover, in the adsorption tower of this invention, the base part which can mount an inner tank and can distribute | circulate gas with respect to the baseplate part of an inner tank is distribute | arranged in the said adsorption tower main body. Thereby, an inner tank can be stably installed on a base part. Furthermore, when performing the purification treatment of the gas to be treated, the gas to be treated flowing out from the bottom plate portion of the inner tank can easily pass through the base portion, and when performing the regeneration treatment of the adsorbent with the recovered gas. Since the recovered gas can easily pass through the base part and flow into the bottom plate of the inner tank, the processing target gas or the recovered gas can be smoothly processed without staying in the adsorption tower body. Can do.

  In this case, a sliding means for sliding the bottom plate portion with respect to the base portion during thermal expansion / contraction of the bottom plate portion is provided between the base portion and the bottom plate portion of the inner tank. Even when the cooling and heating of the bottom plate are repeated by alternately performing the cooling and heating at the time of desorption, it is difficult to generate thermal stress between the bottom plate and the base, and the bottom plate is damaged. In addition, it is possible to prevent wear between the bottom plate portion and the base portion and extend the life of the bottom plate portion and the base portion.

  Furthermore, in the adsorption tower of the present invention, a first introduction part for introducing the gas to be treated into the inner tank, a first discharge part for discharging the gas to be treated from which the organic components have been removed through the adsorbent, and the adsorption tower A second introduction part for introducing the recovery gas into the main body and a second discharge part for discharging the recovery gas that has passed through the adsorbent and recovered the organic components from the adsorbent are arranged, and the first introduction part And the 2nd discharge part is directly connected to the inner tank from the outside through the adsorption tower main part. Thereby, the purification process of the gas to be processed and the regeneration process of the adsorbent by the recovered gas can be performed smoothly.

  In this case, the first heat stress relaxation means is configured by interposing an elastically deformable seal member between the first introduction part and the second discharge part and the adsorption tower body, thereby heating the adsorbent. Even if the cooling and the cooling are repeated alternately, the thermal stress generated mainly in the radial direction (direction perpendicular to the length direction) of the first introduction part and the second discharge part is relieved, and the first introduction part and the second introduction part are relieved. It is possible to prevent the discharge part and the inner tank from being damaged such as cracks and cracks.

  Further, the first introduction part and the second discharge part are provided with elastically deformable telescopic flexible tubes to constitute the second thermal stress relaxation means, so that heating and cooling of the adsorbent are repeated alternately. Even if this occurs, the thermal stress generated mainly in the length direction of the first introduction part and the second discharge part is alleviated, and damage such as cracks or cracks occurs in the first introduction part, the second discharge part and the inner tank. Can be prevented.

  Furthermore, the adsorption tower of the present invention has a porous plate disposed in the inner tank and a support member that supports the porous plate. Since the perforated plate is supported by the support member and arranged upstream of the adsorbent in the gas to be processed, the gas to be processed is rectified before being introduced into the adsorbent, and the gas to be processed is placed in the inner tank. Since the entire adsorbent filled can be distributed, the purification of the gas to be treated by the adsorbent can be performed efficiently.

  Particularly in this case, the support member is disposed between a plurality of first support portions fixed to at least one inner wall surface of the body plate portion and the end surface wall portion, and between at least two first support portions. By having the second support part held so as to be relatively displaceable with respect to the first support part, the perforated plate can be stably supported by the support member, and heating and cooling of the adsorbent are alternately performed. Even if it repeats, the thermal stress which arises between a body board part and an end surface wall part, and the 1st support part can be made small, and it can prevent that damage, such as a crack and a crack, occurs in an inner tub.

  Next, in the treatment method using the adsorption tower provided by the present invention, the gas to be treated is volatilized by introducing a gas to be treated containing a volatile organic compound into the inner tank of the adsorption tower having the above-described configuration. By adsorbing the organic compound to the adsorbent and purifying the gas to be treated, as described above, the temperature of the entire adsorbent can be easily lowered to a predetermined temperature in a short time. Thus, the concentration of the volatile organic compound in the gas to be treated after the purification treatment can be greatly reduced as compared with the conventional case. In particular, such a purification process is extremely effective when purifying a high concentration of a gas to be treated in which the concentration of harmful organic components in the gas to be treated is 500 ppm or more, and the organic component concentration in the gas to be treated is high. The higher the value, the more effective.

  In addition, for example, after the purification treatment as described above is performed, the temperature of the entire adsorbent can be easily raised to a predetermined temperature in a short time by introducing the recovered gas into the inner tank of the adsorption tower. The volatile organic compound can be efficiently desorbed from the adsorbent and recovered in the recovered gas, and the adsorption capacity of the adsorbent can be stably recovered.

It is sectional drawing which shows typically the adsorption tower which concerns on the 1st Embodiment of this invention. It is a perspective sectional view of an inner tank which shows a part of inner tank of the adsorption tower in a section. It is principal part sectional drawing which shows the relationship between an inner tank and a reinforcement member. It is explanatory drawing which shows a supporting member. It is explanatory drawing explaining the sliding means distribute | arranged between the inner tank and the base part. It is sectional drawing which shows typically the adsorption tower which concerns on the 2nd Embodiment of this invention. It is sectional drawing which shows the conventional inner tank type adsorption tower typically.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described in detail with reference to the drawings. The present invention is not limited to the embodiments described below, and various modifications can be made as long as it has substantially the same configuration as the present invention and has the same effects. Is possible. For example, in the present invention, the dimensions of the members and parts described below are not particularly limited, and can be arbitrarily changed according to the size of the adsorption tower.

First, the adsorption tower according to the first embodiment will be described. Here, FIG. 1 is a sectional view showing the adsorption tower according to the first embodiment, and FIG. 2 is a perspective sectional view showing an inner tank of the adsorption tower.
The adsorption tower according to the first embodiment is configured as a horizontal (horizontal) adsorption tower in which the adsorption tower main body and the inner tank are arranged along the horizontal direction. In the following description, The front-rear direction refers to the length direction of the adsorption tower, and the up-down direction refers to the vertical direction. Further, the left-right direction is the width direction of the adsorption tower and refers to the horizontal direction orthogonal to the length direction of the adsorption tower.

  The adsorption tower 1 shown in FIG. 1 is filled with the adsorption tower main body 10, the base part 31 arranged on the bottom part of the adsorption tower main body 10, the inner tank 20 placed on the base part 31, and the inner tank 20 The first adsorbing part 32 that directly introduces the treated gas into the inner tank 20 and the first introducing part 33 that exhausts the treated gas purified by passing through the adsorbent from the adsorption tower body 10. A second introduction part 34 for introducing the recovered gas into the adsorption tower body 10, a second exhaust part 35 for discharging the recovered gas that has passed through the adsorbent from the inner tank 20, and a part of the recovered gas is condensed. And a third discharge part 14 for discharging the liquefied condensate.

  The adsorption tower body 10 is made of a metal such as carbon steel, and has a cylindrical body portion 11, a first spherical surface portion 12 disposed at one end portion (front end portion) of the body portion 11, and the body portion 11. And a second spherical surface portion 13 disposed at the other end portion (rear end portion). Moreover, the 1st discharge part 33 is protruded toward the outer side from the 1st spherical surface part 12 along the front-back direction by the same metal material as the adsorption tower main body 10 at the 1st spherical surface part 12 of the adsorption tower body 10. Are integrally formed. The second spherical portion 13 is integrally formed with a second introduction portion 34 made of the same metal material as the adsorption tower body 10 so as to protrude outward along the front-rear direction.

The body part 11 of the adsorption tower body 10 has an arcuate or flat bottom part and a ceiling part, and left and right side wall parts curved in a convex shape on the outside, and the ceiling part includes a first introduction part. An insertion hole through which 32 and the second discharge part 35 are inserted is formed. In the case of the first embodiment, the size of the body portion 11 in the height direction is set to 2 m, and the size of the body portion 11 in the length direction is set to 6 m. In the present invention, the shape and dimensions of the adsorption tower main body 10 are not particularly limited, and can be arbitrarily changed.

  In this case, between the inner surface of the insertion hole formed in the body part 11 and the first introduction part 32 and the second discharge part 35, a seal member 36 made of an elastomer that can be expanded and contracted by elastic deformation is interposed. Thus, the gas to be processed and the recovered gas are prevented from leaking from the inside of the adsorption tower body 10 to the outside through the insertion hole.

  Further, since such a seal member 36 is interposed, when the adsorption tower body 10, the first introduction part 32, and the second discharge part 35 are cooled or heated, the adsorption tower body 10 and the first Even if the amount of thermal expansion / contraction differs between the first introduction part 32 and the second discharge part 35, the difference in the amount of thermal expansion / contraction (particularly the heat in the radial direction of the first introduction part 32 and the second discharge part 35) The difference in expansion / contraction amount can be absorbed by the elastic deformation of the seal member 36. For this reason, the sealing member 36 functions as a first thermal stress relaxation means, and it is difficult for thermal stress to occur in the adsorption tower body 10, the first introduction part 32, and the second discharge part 35. It is possible to prevent cracks and cracks due to thermal stress in the vicinity of the holes and in the first introduction part 32 and the second discharge part 35.

  Further, the first introduction part 32 and the second discharge part 35 in the first embodiment are provided with an expandable / contractible flexible tube 16 that can be expanded and contracted by elastic deformation, as will be described later. Since the telescopic flexible tube 16 is disposed in each of the first introduction part 32 and the second discharge part 35, the adsorption tower body 10 and the first introduction part are disposed between the adsorption tower body 10 and the inner tank 20. 32 and the second discharge part 35, even if the amount of thermal expansion / contraction is different, the difference in the amount of thermal expansion / contraction (in particular, the length direction of the first introduction part 32 and the second discharge part 35 (center axis direction) The difference in the amount of thermal expansion / contraction in) can be absorbed by the expansion / contraction of the expansion / contraction flexible tube 16. For this reason, the expansion / contraction flexible tube 16 functions as a second thermal stress relaxation means, and it becomes difficult for thermal stress to be generated in the adsorption tower body 10, the first introduction part 32, and the second discharge part 35. It is possible to prevent the first introduction part 32 and the second discharge part 35 from being cracked or cracked due to thermal stress.

  In the first embodiment, both the seal member 36 serving as the first thermal stress relaxation means and the telescopic flexible tube 16 serving as the second thermal stress relaxation means are provided. However, in the present invention, the seal member is provided. It is also possible to provide only one of 36 and the telescopic flexible tube 16 as thermal stress relaxation means.

  Further, as described above, the seal member 36 mainly absorbs the difference in the amount of thermal expansion and contraction in the radial direction between the first introduction part 32 and the second discharge part 35, but the first introduction part 32 and the second discharge part. The difference in the amount of thermal expansion and contraction in the length direction of 35 can also be absorbed. The expansion / contraction flexible tube 16 mainly absorbs the difference in the amount of thermal expansion / contraction in the length direction of the first introduction part 32 and the second discharge part 35, but is adsorbed by the first introduction part 32 and the second discharge part 35. Differences in the amount of thermal expansion / contraction, thermal displacement, or thermal deformation in the length direction (front-rear direction) and in the left-right direction (width direction) between the tower body 10 and the inner tank 20 can also be absorbed.

  In 1st Embodiment, the trunk | drum 11 of the adsorption tower main body 10, the 1st spherical part 12, and the 2nd spherical part 13 have the same thickness. In this case, the thickness of the adsorption tower body 10 can prevent the adsorption tower body from being deformed or damaged when the adsorption tower body is manufactured, moved or installed, and can stably protect the inner tank 20, and It is set to a size that ensures the strength to withstand the pressure in the adsorption tower main body 10 when the gas to be treated and the recovery gas are introduced into the adsorption tower main body 10, specifically, 6 mm or more and 20 mm or less. Preferably, it is set to 9 mm or more and 15 mm or less. Actually, the thickness of the body portion 11 in the first embodiment is set to 9 mm. In the present invention, the thicknesses of the body part 11, the first spherical part 12, and the second spherical part 13 of the adsorption tower body 10 can be set to different sizes within the above-mentioned range. .

  Furthermore, it is preferable that a heat insulating material (not shown) is attached to the outer peripheral surface of the adsorption tower body 10 having the body part 11, the first spherical part 12, and the second spherical part 13. By providing such a heat insulating material, energy loss due to heat radiation from the adsorption tower body 10 to the atmosphere can be reduced, whereby the adsorption tower body 10 and the inner tank 20 are heated by the recovered gas as described later. In this case, the temperature difference generated between the adsorption tower body 10 and the inner tank 20 can be suppressed to a small value.

  The base portion 31 of the first embodiment is configured by assembling a plurality of shaped steels in a lattice shape, and a plurality of first shapes arranged in parallel along the left-right direction on the bottom surface portion of the adsorption tower body 10. It has steel (H-section steel) 31a and a plurality of second-section steel (H-section steel) 31b arranged in parallel along the front-rear direction on the first section steel 31a. In this case, the first shape steel 31a is arranged at a pitch of 80 cm or more and 120 cm or less, and the second shape steel 31b is arranged at a pitch of 60 cm or more and 100 cm or less.

  As described above, the base portion 31 is configured by the first and second shape steels 31a and 31b assembled in a lattice shape, so that the inner tub 20 can be stably placed on the base portion 31, and the inner portion Since the lower surface side of the bottom plate portion 24 to be described later of the tank 20 is not blocked by the base portion 31, the gas to be treated flowing out from the inner tank 20 through the bottom plate portion 24 passes through the base portion 31 smoothly and is first. It is possible to flow to one discharge unit 33. Further, the recovered gas introduced from the second introduction part 34 can smoothly pass through the base part 31 and flow into the inner tank 20 through the bottom plate part 24 of the inner tank 20.

  In addition, the foundation part of this invention is not limited to what is comprised by assembling a some shape steel in a grid | lattice form like 1st Embodiment, It distribute | circulates gas with respect to the baseplate part of an inner tank. Other structures (for example, the structure of the base portion in the second embodiment described later) can be employed as long as they are configured to be possible.

  Further, guide members 37 having a substantially L-shaped cross section are fixed to front and rear end edges and left and right side edges on the upper surface side of the base portion 31 (upper surface side of the second shape steel 31b). . In this guide member 37, one plate side portion constituting the L shape is fixed to the second shape steel 31b, and the other plate side portion constituting the L shape is arranged in the front and rear and the left and right sides of the bottom plate portion 24 of the inner tank 20. Standing up to surround the direction.

  In this case, in order to prevent the other plate side portion of the guide member 37 from interfering with the bottom plate portion 24 of the inner tub 20, a slight space is formed between the bottom plate portion 24 of the inner tub 20. It is preferable that they are spaced apart. By providing such a guide member 37, the position of the inner tub 20 placed on the base portion 31 is prevented from protruding to an area outside the base portion 31.

  Further, the bottom plate portion 24 of the inner tank 20 can slide with respect to the base portion 31 on the upper surface of the second shape steel 31 b of the base portion 31 and the upper surface of the one side of the guide member 37. A sliding layer 38 serving as a sliding means is provided. The sliding layer 38 is made of a synthetic resin having an extremely small friction coefficient such as a fluororesin (for example, polytetrafluoroethylene).

  By providing such a sliding layer 38, when the bottom plate portion 24 of the inner tub 20 is thermally expanded and contracted as the adsorbent is cooled and heated, the bottom plate portion 24 smoothly moves with respect to the base portion 31. You can slide. For this reason, even if the cooling and heating of the adsorbent are alternately repeated and the thermal contraction and thermal expansion of the bottom plate portion 24 are repeatedly generated, it is possible to prevent the bottom plate portion 24 from being worn. Further, even if there is a difference in thermal expansion / contraction between the bottom plate portion 24 and the second shape steel 31b or the guide member 37, the inner plate 20 is unlikely to generate thermal stress due to the bottom plate portion 24 sliding. It can be prevented from being damaged.

  In this case, even if the bottom plate portion 24 of the inner tub 20 repeats thermal contraction and thermal expansion, the length direction of the bottom plate portion 24 is set so that the relative position of the bottom plate portion 24 with respect to the base portion 31 does not shift. And the center part in the width direction is being fixed to the 2nd shape steel 31b by the welding part 39 and other fixing means, without passing through the sliding layer 38 (refer FIG. 5). Therefore, when the bottom plate portion 24 of the inner tub 20 is thermally expanded and contracted, the bottom plate portion 24 is moved back and forth around the welded portion 39 without the relative position with respect to the base portion 31 being shifted in the length direction or the width direction. Thermal contraction or thermal expansion is possible while sliding in the left and right directions.

  In the present invention, the specific configuration of the sliding means for sliding the bottom plate portion 24 of the inner tub 20 relative to the base portion 31 is not particularly limited, and the above-described sliding layer 38 made of synthetic resin. In addition, for example, a groove is formed along the length direction on the upper surface of each second shape steel 31b, and a plurality of rolling elements (balls) are rotatably held in the groove to constitute a sliding means. It is also possible.

  The inner tub 20 is arranged along the front-rear direction and has a trunk plate portion 21 having an inverted U-shaped cross section, a first end face wall portion 22 fixed to the front end of the trunk plate portion 21, and the trunk plate portion 21. A second end face wall portion 23 fixed to the rear end, a body plate portion 21, a first end surface wall portion 22, a bottom plate portion 24 fixed to the lower end of the second end surface wall portion 23, and the body plate portion 21. And a reinforcing member 25 attached along the outer peripheral surface of the body plate portion 21 in a direction orthogonal to the length direction.

  The body plate portion 21 of the inner tub 20 is formed in a bowl shape by bending a metal plate such as stainless steel so that the cross section is U-shaped. A pair of left and right side walls formed of flat plate-like walls facing each other parallel to the vertical direction (horizontal direction), and a ceiling that is curved in an arc shape between the upper ends of the pair of left and right side walls; It has. In the present invention, the shape of the inner tank is not limited, for example, the side wall of the body plate portion may be configured in a curved shape in an arc instead of the flat shape as described above, Moreover, the ceiling of the trunk plate portion may be formed in a flat plate shape instead of being curved in an arc shape as described above.

  The thickness of the body plate portion 21 is thinner than the thickness of the adsorption tower body 10, and is specifically set to 1 mm or more and 4 mm or less, preferably 2 mm or more and 3 mm or less, in the first embodiment. The actual thickness of the body plate portion 21 is set to 2 mm. In this way, by setting the thickness of the body plate portion 21 to 1 mm or more, it is possible to obtain a strength capable of filling and holding the adsorbent in the inner tank 20. Further, by setting the thickness of the trunk plate portion 21 to 4 mm or less, the heat capacity of the trunk plate portion 21 is reduced, and when the adsorbent is cooled or heated, the temperature of the trunk plate portion 21 is set to the temperature of the adsorbent. Can be easily changed to match.

  Further, when the inner tub 20 is filled with the adsorbent in the inner tub 20 of the first embodiment, the entire adsorbent contacts the body plate portion 21, the first end surface wall portion 22, and the second end surface wall portion 23. It is preferable that the ratio of the area where the adsorbent contacts only the body plate portion 21 is set to 60% or more, and preferably 70% or more with respect to the area.

  Thereby, when cooling or heating the entire adsorbent, the influence of the temperature change of the adsorbent from the first end face wall portion 22 and the second end face wall portion 23 is reduced, and the adsorbent is separated from the inner wall surface of the body plate portion 21. Compared to the temperature change of the adsorbent disposed in the central portion, the portion in contact with the inner wall surface of the inner tank 20 (particularly, the inner wall surfaces of the first end surface wall portion 22 and the second end surface wall portion 23), A time delay can be made less likely to occur in the temperature change of the adsorbent disposed in the vicinity of the inner wall surface.

In the case of the first embodiment, as described above, the body 11, the first spherical surface 12, and the second spherical surface 13 of the adsorption tower body 10 have the same thickness. If the wall thickness of the adsorption tower body 10 is made thinner than the thickness of the body portion 1 of the adsorption tower body 10, the thickness of the first spherical surface section 12 and the second spherical surface section 13 of the adsorption tower body 10 is inevitably thinner. For example, when the thickness of the body part 11, the first spherical surface part 12, and the second spherical surface part 13 of the adsorption tower body 10 are different from each other, the thickness of the body plate part 21 is the same as that of the body part 11 of the adsorption tower body 10, the first It is set to be thinner than the thickness of the thinnest member among the spherical surface portion 12 and the second spherical surface portion 13.

  On the ceiling of the trunk plate part 21, there are a first introduction part 32 for directly introducing the gas to be treated into the inner tank 20 and a second discharge part 35 for discharging the recovered gas that has passed through the adsorbent from the inner tank 20. The body plate 21 is integrally formed using the same metal material.

  The first and second end face wall portions 22 and 23 of the inner tub 20 are each composed of a single metal flat plate made of the same material as the body plate portion 21, and the front end portion of the body plate portion 21 by welding or the like. And it is firmly fixed to the rear end. Further, the thickness of the first and second end wall portions 22 and 23 is set to be thicker than the thickness of the body plate portion 21 and smaller than the thickness of the adsorption tower body 10. Specifically, the thickness of the first and second end wall portions 22 and 23 is set to be larger than 3 mm and not larger than 8 mm, preferably not smaller than 4 mm and not larger than 6 mm, and the actual body plate in the first embodiment. The thickness of the part 21 is set to 5 mm.

  For example, when a gas to be treated or a recovered gas is introduced into the inner tank 20, pressure loss occurs when these gases pass through the adsorbent. Therefore, as will be described later, when the gas to be treated is introduced from the first introduction part 32 and discharged from the first discharge part 33 in order to purify the gas to be treated, the pressure in the internal space of the inner tank 20 Becomes higher than the outer space of the inner tank 20, and a pressure difference is generated between the inner space and the outer space of the inner tank 20. On the other hand, when the gas to be treated is introduced from the second introduction part 34 and discharged from the second discharge part 35 in order to regenerate the adsorbent, the pressure in the outer space of the inner tank 20 is greater than the inner space of the inner tank 20. And the pressure difference is generated between the inner space and the outer space of the inner tank 20.

  As described above, when a pressure difference is generated between the inner space and the outer space of the inner tank 20 at the time of adsorption and desorption, the first and second end face wall portions 22 and 23 are formed by a single large flat metal plate. For example, if the thickness of the first and second end wall portions 22 and 23 is set to the same size as that of the body plate portion 21, compared to the body plate portion 21 subjected to bending processing. Thus, a concave curve that dents inward or a convex curve that bulges outward tends to occur greatly, and metal fatigue tends to proceed.

  Therefore, in the first embodiment, the strength of the first and second end face wall portions 22 and 23 is increased by making the first and second end face wall portions 22 and 23 thicker than the body plate portion 21. Thus, even if a pressure difference is generated between the inner space and the outer space of the inner tank 20, it is difficult to cause the concave or convex curve as described above, and the metal fatigue is prevented from progressing.

  When the first and second end wall portions 22 and 23 are configured to have the same thickness as that of the body plate portion 21, for example, on the outer surface side of the first and second end surface wall portions 22 and 23. By providing the reinforcing member 25, the first and second end face wall portions 22 and 23 are reinforced so that the first and second end face wall portions 22 and 23 are less likely to be concave or convex as described above. Is also possible.

  However, in this case, since the first and second end face wall portions 22 and 23 are each constituted by one large metal flat plate, the amount of thermal expansion and contraction when the temperature changes is large, and the first and second end face wall portions 22 are large. , 23, a large thermal stress is likely to be generated by fixing the reinforcing member 25 to the first and second end walls 23, 23. Therefore, there is a possibility that the first and second end face wall portions 22, 23 are cracked or cracked.

In the first embodiment, the first and second end face wall portions 22 and 23 are made thinner than the thickness of the adsorption tower body 10 as described above, whereby the first and second end face wall portions are formed. When the heat capacity of 22 and 23 is reduced, and the adsorbent is cooled or heated, the first and second end face walls 2
The temperatures of 2 and 23 can be changed relatively easily so as to follow the temperature change of the adsorbent.

  The bottom plate portion 24 of the inner tank 20 is fixed to the lower ends of the body plate portion 21, the first end surface wall portion 22, and the second end surface wall portion 23, and a grating member 24a formed by assembling steel materials in a lattice shape. The first perforated plate 24b is fixed on the grating member 24a and has a plurality of holes.

  By configuring the bottom plate portion 24 in this way, the strength of the bottom plate portion 24 is increased by the grating member 24a so that the adsorbent can be stably held, and the gas (processed gas or recovered gas) is supplied to the bottom plate portion. It becomes possible to ventilate well from the inside of the inner tank 20 to the outside through the 24 or from the outside to the inside of the inner tank 20.

  Further, since the bottom plate portion 24 includes the first porous plate 24b, the first porous plate 24b resists the flow of the recovered gas when the recovered gas is introduced into the inner tank 20 and enters the adsorbent filling portion. Thus, the recovery gas can be diffused and the recovery gas can be made to uniformly enter the adsorbent from each hole of the first porous plate 24b at an approximately equal flow rate.

  In the present invention, the size and density of the opening formed in the grating member 24a and the size, shape, and density of the holes drilled in the first porous plate 24b are not particularly limited, and are arbitrarily set. The

  The reinforcing member 25 disposed in the inner tub 20 is configured using the same metal material as that of the body plate portion 21 or a metal material having substantially the same thermal expansion coefficient and thermal contraction rate as the material of the body plate portion 21. Yes. Five reinforcing members 25 of the first embodiment are attached to the outer peripheral surface of the body plate portion 21, and each reinforcing member 25 is along the body plate portion circumferential direction orthogonal to the length direction of the body plate portion 21. Then, in a state where the outer peripheral surface of the body plate portion 21 is continuously contacted, it is partially fixed to the outer peripheral surface of the body plate portion 21 at a plurality of locations (two or more locations) spaced at predetermined intervals by spot welding. Has been. In this case, the distance between the reinforcing members 25 in the length direction (front-rear direction) of the inner tank 20 is set to 600 mm or more and 1300 mm or less.

  Further, in the first embodiment, as shown in FIG. 3, a cross section of the reinforcing member 25, each reinforcing member 25 has a body plate portion so that a transverse cross section with respect to the length direction of the reinforcing member 25 is substantially L-shaped. 21 has a first plate piece portion 25a having a contact surface that contacts the outer peripheral surface of 21 and a rib-like second plate piece portion 25b standing from one end (rear end) of the first plate piece portion 25a. .

  That is, in the reinforcing member 25, the entire surface of the first plate piece portion 25 a is in contact with the outer peripheral surface of the trunk plate portion 21, and the second plate piece portion 25 b is orthogonal to the outer peripheral surface of the trunk plate portion 21. It is attached to the body plate portion 21 in a state of standing in the direction. In this case, the plate width dimension (the size in the front-rear direction) of the first plate piece portion 25a and the plate width dimension (the size in the vertical direction) of the second plate piece portion 25b are each set to 30 mm. In addition, the plate thickness dimension of the first and second plate pieces 25a, 25b is set to a size equal to or smaller than the dimension 1 mm larger than the thickness of the body plate portion 21, and specifically, the first The actual thickness of the first and second plate pieces 25a, 25b in the embodiment is set to 3 mm.

  Since the reinforcing member 25 having such a shape and size is attached to the outer peripheral surface of the trunk plate portion 21, the trunk plate portion 21 of the inner tank 20 is reinforced, so that the adsorbent is contained in the inner tank 20. While being hold | maintained stably, when the pressure difference (internal / external pressure difference) arises between the internal space and the outer space of the inner tank 20, it suppresses that the trunk | drum board part 21 deform | transforms large.

  In addition, the plate thickness dimension of the first and second plate pieces 25a and 25b of each reinforcing member 25 is set to a size equal to or smaller than the dimension that is 1 mm larger than the thickness of the body plate portion 21 as described above. Thus, the heat capacity of the reinforcing member 25 can be reduced so as to be substantially the same as the heat capacity of the body plate portion 21, and when the temperature of the inner tank 20 and the reinforcing member 25 is lowered or cooled by cooling or heating of the adsorbent, It is difficult to produce a temperature difference or a difference in thermal expansion / contraction between the body plate portion 21 of the inner tank 20 and the reinforcing member 25.

  In addition, the first plate piece portion 25a and the body plate portion 21 are partially fixed to the outer peripheral surface of the body plate portion 21 by spot welding. Therefore, even if there is a difference between the thermal expansion / contraction amount of the body plate portion 21 and the thermal expansion / contraction amount of the reinforcing member 25, the difference in thermal expansion / contraction amount can be reduced. Therefore, the thermal stress generated between the body plate portion 21 and the reinforcing member 25 can be suppressed to a small level.

  As a result, even if the cooling and heating of the body plate portion 21 and the reinforcing member 25 are repeated, it is possible to make it difficult for cracks and cracks to occur near the fixing portion of the body plate portion 21 to the reinforcing member 25. In the present invention, the shape and size of the reinforcing member 25 and the number of the reinforcing members 25 to be installed are not particularly limited, and can be arbitrarily changed. Further, as described above, the reinforcing member 25 is configured to have a substantially L-shaped cross section, but in the present invention, for example, the rib-shaped second plate piece portion is replaced by the plate width of the first plate piece portion. It is also possible to configure the reinforcing member so that the transverse section shows a substantially T-shape by rising from a substantially central portion in the direction.

  The inside of the inner tub 20 is filled with the adsorbent uniformly from the bottom plate portion 24 to a predetermined height (in the first embodiment, a height of 1 m from the bottom plate portion 24). An (activated carbon layer) 26 is formed, and on the upper surface side of the adsorbent filling portion 26, a second perforated plate 27 is supported by a support member 28 so as to cover the adsorbent.

  In the first embodiment, activated carbon is used as the adsorbent, but the type of the adsorbent is not particularly limited, and conventionally known adsorption such as zeolite and silica gel in addition to activated carbon. It is also possible to use materials.

  The second porous plate 27 is configured by regularly forming a plurality of holes in a metal rectangular flat plate. Since the second perforated plate 27 is arranged on the upper surface side of the adsorbent filling part 26, the gas to be treated is introduced into the inner tank 20 from the first introduction part 32 and enters the adsorbent filling part 26. The second perforated plate 27 acts as a rectifying plate that imparts resistance to the flow of the gas to be processed and diffuses the gas to be processed. Thus, the adsorbent filling part 26 can be made to enter evenly.

  The support member 28 that supports the second perforated plate 27 at a predetermined height position supports the body plate portion 21 in the inner tank 20 so as to support each edge portion of the four sides of the second perforated plate 27 from the lower surface side. Are arranged on the inner wall surface and the inner wall surfaces of the first and second end surface wall portions 22, 23. As shown in FIG. 4, the support member 28 includes a plurality of first members welded to the inner wall surfaces of the body plate portion 21, the first end surface wall portion 22, and the second end surface wall portion 23 at a predetermined interval. It has the support part 29 and the elongate 2nd support part 30 which is distribute | arranged straddling between the 2 or more 1st support parts 29, and mounts the 2nd perforated panel 27 in it.

  Each first support portion 29 of the support member 28 is welded to each inner wall surface of the inner tub 20, and extends in the horizontal direction from the upper end of the weld piece 29 a toward the inside of the inner tub 20. And a projecting portion 29c projecting from the upper surface of the supporting piece portion 29b.

In this case, the dimension of the first support portion 29 in the direction parallel to the inner wall surface is set to 50 mm or more and 300 mm or less.
A fixing force capable of supporting the second perforated plate 27 with the support portion 29 can be stably secured. Moreover, by making the said dimension 300 mm or less, it prevents that the fixed area of each inner wall surface and the 1st support part 29 becomes large more than needed, and the inner tank 20 and support member by cooling or heating of an adsorption agent. The difference between the amount of thermal expansion / contraction of the inner tub 20 and the amount of thermal expansion / contraction of the first support portion 29 when the temperature 28 is lowered or rises can be reduced, and the thermal stress generated in the inner tub 20 can be kept small.

  The second support portion 30 of the support member 28 has a long hole 30a into which the protruding portion 29c of the first support portion 29 is inserted, corresponding to the installation position of the first support portion 29, and each long hole 30a. Is formed long in the length direction of the second support portion 30. Such a second support portion 30 is placed between two or more first support portions 29, and the protruding portion 29 c of each first support portion 29 has a corresponding length of the second support portion 30. It is held by being inserted into the hole 30a.

  By configuring the support member 28 in this manner, the relative position of the second support portion 30 with respect to the first support portion 29 is increased when the inner tub 20 and the support member 28 are thermally contracted or expanded, respectively. For example, even if a difference occurs between the amount of thermal expansion / contraction of the inner tub 20 and the amount of thermal expansion / contraction of the second support portion 30, the inner tub 20 and the second tub 20 can be easily changed along the vertical direction. It can prevent that the thermal stress generate | occur | produces in the support part 30. FIG.

  As described above, in the support member 28 according to the first embodiment, even if the inner tub 20 and the support member 28 are thermally contracted or expanded as the adsorbent is cooled or heated, thermal stress is hardly generated in the inner tub 20. Therefore, even if the cooling and heating of the adsorbent are repeated alternately, it is possible to prevent the inner tank 20 from being cracked or cracked.

  In the present invention, if the support member 28 can stably support the second perforated plate 27, the inner wall surface of the body plate portion 21 and the inner wall surfaces of the first end surface wall portion 22 and the second end surface wall portion 23 will be described. It may be arranged only on one of the inner wall surfaces. Further, the dimensions and the number of installed first support portions 29 can be arbitrarily changed according to the size of the inner tank 20 and the like.

  Furthermore, in the first embodiment, a sliding layer (not shown) made of a synthetic resin having a very low friction coefficient such as a fluororesin is provided on the upper surface of the second support portion 30 (the placement surface on which the second porous plate 27 is placed). Is preferably provided. By providing such a sliding layer, when the second perforated plate 27 placed and supported on the second support portion 30 is thermally contracted or thermally expanded, the second support portion 30 is supported. Since the second porous plate 27 can be easily slid, the second support portion 30 and the second porous plate 27 are prevented from being worn, and the second support portion 30 and the second porous plate 27 are heated. Stress is less likely to occur.

  The first introduction part 32 for introducing the gas to be treated is formed integrally with the body plate part 21 of the inner tank 20, and a portion between the adsorption tower body 10 and the inner tank 20 in the first introduction part 32. Connected to the telescopic flexible tube 16 is elastically deformable. The first introduction part 32 extends to the outside of the adsorption tower body 10 through an insertion hole formed in the adsorption tower body 10, and is connected to the first supply line 6 that supplies the gas to be treated to the adsorption tower 1. It is connected. In this case, a first open / close valve 6a is arranged in the first supply line 6 of the gas to be processed.

  As described above, the first discharge part 33 for discharging the gas to be treated from the adsorption tower body 10 is formed to protrude outward from the first spherical surface part 12 of the adsorption tower body 10 and includes the second opening / closing valve 7a. Connected to the first discharge line 7 of the gas to be treated.

As described above, the second introduction part 34 for introducing the recovered gas into the adsorption tower body 10 is formed to protrude outward from the second spherical surface part 13 of the adsorption tower body 10 and includes the third opening / closing valve 8a. The recovered gas is connected to the second supply line 8. In the present invention, the second introduction part 34 is extended to the inner side of the adsorption tower body 10 to a position below the inner tank 20 so as not to interfere with the base part 31, and directed toward the bottom plate part 24 of the inner tank 20. The recovered gas may be allowed to flow out.

  The second discharge portion 35 for discharging the recovered gas is formed integrally with the body plate portion 21 of the inner tank 20, and is formed in a portion between the adsorption tower body 10 and the inner tank 20 in the second discharge portion 35. Is connected to a telescopic flexible tube 16 that can be expanded and contracted by elastic deformation. The second discharge unit 35 extends outside the adsorption tower body 10 through an insertion hole formed in the adsorption tower body 10 and is connected to the second discharge line 9 of the recovered gas provided with the fourth opening / closing valve 9a. Has been. In addition, a condenser (not shown) is disposed downstream of the second discharge line 9, and the condenser gas containing the organic component is condensed by the condenser to separate and recover the organic component from the recovered gas. The recovered gas from which the organic components have been separated can be discharged to the outside.

  The third discharge part 14 is suspended downward from the bottom of the adsorption tower body 10 in order to discharge the condensate obtained by condensing the liquefied part of the recovered gas to the outside. 14 is connected to the 3rd discharge line 15 of the condensate provided with the 5th on-off valve 15a. In the present invention, the arrangement positions of the first introduction part 32, the first discharge part 33, the second introduction part 34, the second discharge part 35, and the third discharge part 14 can be appropriately changed. is there.

  In the first embodiment, the first on-off valve 6a to the fourth on-off valve 9a and the fifth on-off valve 15a are each electrically connected to a control unit (not shown), and the control unit performs the first on-off valve. The opening / closing operations of the valve 6a to the fourth opening / closing valve 9a and the fifth opening / closing valve 15a and the opening amounts of the opening / closing valves 6a to 9a, 15a are controlled.

  In the first embodiment, the first introduction part 32 for introducing the gas to be treated into the inner tank 20 and the second discharge part 35 for discharging the recovered gas from the inner tank 20 are respectively separate cylindrical tubes. However, in the present invention, the first introduction part and the second discharge part can be constituted by the same cylindrical tube part. In this case, the pipe connected to the cylindrical pipe part constituting the first introduction part and the second discharge part is branched, and the first opening / closing valve and the fourth opening / closing valve are provided on the branched pipe, respectively. A first supply line for the gas to be processed and a discharge line for the recovered gas are formed.

  Furthermore, in the present invention, the first discharge part and the second introduction part can be configured by the same cylindrical pipe part. In this case, the pipe connected to the cylindrical pipe part branches, By providing the second opening / closing valve and the third opening / closing valve on the branched pipe line, an exhaust line for the gas to be processed and a supply line for the recovered gas are formed.

Next, a method of performing the purification process of the gas to be processed and the regeneration process of the adsorbent with the recovered gas by the adsorption tower 1 of the first embodiment will be described in order.
In the first embodiment, by introducing an exhaust gas containing a harmful organic component such as VOC generated in a semiconductor factory, a chemical factory or the like into the adsorption tower 1 as a gas to be treated, a predetermined organic harmful from the exhaust gas is obtained. A gas purification process is performed in which the components are adsorbed and removed by the adsorbent. In the present invention, the target gas to be purified includes, for example, alcohols such as methanol and ethanol; organochlorine compounds such as methylene chloride (dichloromethane) and trichloroethane; esters such as ethyl acetate and methyl butyrate. Ketones such as acetone and methyl ethyl ketone; aromatic compounds such as benzene and toluene; gases containing at least one organic solvent selected from the group such as aldehydes; and gases containing odorous components.

When purifying the gas to be treated, if the organic component has already been adsorbed on the adsorbent filled in the inner tank 20, the gas to be treated is put into the inner tank 20 as will be described later. Before the introduction, the recovery gas (pressurized water vapor) is introduced into the adsorption tower main body 10 to regenerate the adsorbent by desorbing organic components from the adsorbent while heating the adsorbent to a predetermined temperature. Done.

  In the case of removing a predetermined organic component from the exhaust gas to be processed gas using the adsorption tower 1 of the first embodiment, first, the first on-off valve 6a is opened to set the gas to be processed (exhaust gas) to the first level. While introducing into the inner tank 20 from the 1 supply line 6 via the 1st introduction part 32, the 2nd opening-and-closing valve 7a is opened, and the gas (including gas to be processed) in adsorption tower body 10 is the 1st discharge line. 7 to be discharged to the outside. At this time, the third opening / closing valve 8a disposed in the second supply line 8, the fourth opening / closing valve 9a disposed in the second discharge line 9, and the fifth opening / closing valve 15a disposed in the third discharge line 15. Is in a closed state.

  The gas to be treated introduced into the inner tank 20 from the first introduction part 32 sequentially enters the adsorbent filling part 26 via the second perforated plate 27. At this time, the second porous plate 27 functions as a rectifying plate as described above, and allows the gas to be processed to enter the adsorbent filling portion 26 from the entire upper surface of the adsorbent filling portion 26 substantially uniformly.

  Further, the gas to be treated that has entered from the upper surface side of the adsorbent filling unit 26 comes into contact with the adsorbent, whereby harmful organic components in the gas to be treated are adsorbed by the adsorbent and separated and removed from the gas to be treated. .

  At this time, although the temperature of the gas to be treated (for example, about 35 ° C.) is not high, if the adsorbent is regenerated with pressurized steam before the gas to be treated is treated, the temperature of the adsorbent Is heated by pressurized steam and rises. For this reason, by introducing the gas to be treated into the adsorbent filling unit 26, the adsorbent is allowed to adsorb organic components while cooling the adsorbent to a predetermined temperature (about 35 ° C.). Thus, by performing adsorption while cooling the adsorbent to a predetermined temperature, it is possible to increase the adsorption amount of the adsorbent and efficiently adsorb the organic components on the adsorbent.

  In this case, when the adsorbent is cooled, the inner tank 20 is also cooled by the adsorbent and the gas to be processed. In the adsorption tower 1 of 1st Embodiment, the thickness of the trunk | drum board part 21 is 2 mm, and the thickness of the 1st end surface wall part 22 and the 2nd end surface wall part 23 is 5 mm, and each thickness is an adsorption tower. It is set thinner than the wall thickness (9 mm) of the main body 10, and the heat capacities of the body plate part 21, the first end face wall part 22, and the second end face wall part 23 are small. For this reason, the temperature of the trunk | drum board part 21, the 1st end surface wall part 22, and the 2nd end surface wall part 23 can be reduced easily, and it can be made to follow a temperature change of adsorption agent promptly.

  Thereby, at the time of cooling of adsorbent, it arrange | positions to the part which is contacting the inner wall face of the trunk | drum 21, the 1st end surface wall part 22, and the 2nd end surface wall part 23, and the vicinity part of the inner wall surface. The temperature of the adsorbent can be changed in substantially the same manner as the temperature change of the adsorbent disposed in the central portion away from the inner wall surface of the body plate portion 21.

  For this reason, in 1st Embodiment, time delay arises in the temperature change of adsorbent by the position where the adsorbent is arranged in the surface (in horizontal plane) orthogonal to the approach direction of the gas to be processed. Can be prevented. As a result, the entire adsorbent filled in the inner tank 20 can be efficiently cooled to a predetermined temperature, and the adsorbent of the entire adsorbent can be appropriately exhibited. The concentration of the organic component in the gas to be processed can be greatly reduced.

At this time, along with the cooling of the inner tub 20 as described above, the reinforcing member 25 attached to the outer peripheral surface of the body plate portion 21 and the support member 28 fixed to the inner wall surface of the inner tub 20 are also cooled. The In this case, the plate thickness dimensions of the first and second plate pieces 25a and 25b in the reinforcing member 25 are set to a predetermined size or less as described above, and the heat capacity of the reinforcing member 25 is also reduced. For this reason, the temperature of the reinforcing member 25 can be easily lowered by following the temperature change of the trunk plate portion 21, and thereby, a temperature difference between the trunk plate portion 21 of the inner tub 20 and the reinforcing member 25 can be reduced. This makes it difficult to generate differences in the amount of thermal expansion and contraction.

  In addition, since the first plate piece portion 25a of the reinforcing member 25 is partially fixed to the outer peripheral surface of the body plate portion 21 by spot welding, even when the inner tank 20 and the reinforcing member 25 are cooled, Even if there is a difference between the thermal expansion / contraction amount of the trunk plate portion 21 and the thermal expansion / contraction amount of the reinforcing member 25, the thermal stress generated in the trunk plate portion 21 can be suppressed to a low level, and this is caused by the thermal stress. It is possible to prevent the body plate portion 21 from being cracked or cracked.

  Further, the support member 28 fixed to the inner wall surface of the inner tank 20 has the first and second support portions 29 and 30 as described above, so that the inner tank 20 and the support member 28 are cooled. Even if the heat shrinks, it is difficult for thermal stress to be generated in the inner tank 20, so that it is possible to prevent the inner tank 20 from being cracked or cracked by the attachment of the support member 28.

  That is, in the adsorption tower 1 of the first embodiment, the temperature change is facilitated by reducing the heat capacities of the body plate part 21, the first end face wall part 22, and the second end face wall part 23 of the inner tank 20. The adverse effect of the strength reduction of the body plate portion 21 that occurs is eliminated by attaching the reinforcing member 25.

  In addition, since the temperature change of the inner tub 20 becomes easy, the problem of thermal stress generated due to the temperature difference between the inner tub 20 and the reinforcing member 25 and the support member 28 and the difference in thermal expansion and contraction, By devising the structure of the reinforcing member 25 and the support member 28 as described above, the inner tank 20 is prevented from being cracked or cracked. The short path problem is prevented from occurring like a tank type adsorption tower.

  Further, in the adsorption tower 1 of the first embodiment, although the inner tank 20 is cooled and the bottom plate part 24 is also thermally contracted, the upper surface of the base part 31 on which the inner tank 20 is placed is as described above. Since the sliding layer 38 formed of a synthetic resin having a small friction coefficient is provided, the heat-shrinkable bottom plate portion 24 can be easily slid with respect to the base portion 31, thereby the bottom plate portion 24 is In addition to preventing wear, the bottom plate portion 24 can also be prevented from being damaged due to thermal stress.

  The gas to be treated is purified by separating and removing the organic components by the adsorbent while passing the adsorbent from the upper surface side to the lower surface side as described above. Thereafter, the purified gas to be treated flows into the space between the inner tank 20 and the adsorption tower body 10 via the bottom plate portion 24 and the base portion 31 of the inner tank 20, and fills the space. Then, it is discharged to the outside through the first discharge part 33 and the discharge line of the gas to be processed.

  In this case, the pressure in the inner tank 20 increases because the gas to be processed is continuously introduced from the first introduction part 32 at a predetermined flow rate. The reason for this is that a pressure loss of the gas to be processed occurs when the gas to be processed passes through the adsorbent filling portion 26 from the upper surface side to the lower surface side, so that an internal / external pressure difference is generated in the inner tank 20.

However, in the inner tub 20 of the first embodiment, the reinforcing member 25 is attached to the outer peripheral surface of the body plate portion 21 whose thickness is thin, and the first and second end surface wall portions 22 and 23 are attached. Is formed thicker than the body plate portion 21, the inner tub 20 can withstand the inner / outer pressure difference and is affected by the inner / outer pressure difference even if the inner / outer pressure difference as described above occurs in the inner tub 20. Thus, the inner tank 20 is prevented from being greatly deformed or damaged.

  As described above, according to the adsorption tower 1 of the first embodiment, by allowing the gas to be treated to enter the adsorbent, the adsorbent is efficiently and substantially uniformly in a cross section perpendicular to the gas entry direction by the gas to be treated. Since it can be cooled and the adsorption capacity of the adsorbent can be exhibited appropriately, the gas to be treated is efficiently purified, and the concentration of the organic component in the gas to be treated that has passed through the adsorbent is reliably reduced. be able to.

  For example, when producing an acetate fiber from an acetone solution, harmful acetone gas is generated and discharged by evaporating acetone used as a solvent from the spinning dope. By purifying the gas discharged in the manufacturing process of such acetate fibers using the adsorption tower 1 of the first embodiment, the acetone component in the exhaust gas is adsorbed by the adsorbent and efficiently. Since it is removed, the concentration of acetone in the exhaust gas can be greatly reduced.

  Specifically, after the adsorbent regeneration process as described later is performed on the adsorption tower 1 of the first embodiment, a gas to be treated having an acetone concentration of 25% that is the lower explosion limit is introduced into the inner tank 20. When the purification process is performed, the concentration of the gas to be treated after the purification process discharged from the first discharge unit 33 of the adsorption tower 1 is adjusted to the extent that adsorption breakthrough progresses to some extent from the start of adsorption with low adsorption efficiency. Even when the time is included, the average can be reduced to about 20 to 40 ppm as compared with the case where the purification treatment is performed using a conventional adsorption tower.

Such an adsorption tower 1 of the first embodiment is extremely effective particularly when purifying a high-concentration gas to be treated in which the concentration of harmful organic components in the gas to be treated is 500 ppm or more. The higher the organic component concentration, the more effective. Furthermore, the adsorption tower 1 of the first embodiment is particularly preferably used for a large adsorption tower capable of purifying the gas to be treated with a large air volume of 100 m ³ / min or more.

In addition, since the adsorption tower 1 of the first embodiment can change the temperature change of the adsorbent to a predetermined temperature in a short time over the entire portion, the total heat capacity of the adsorbent is A small adsorption tower with a small flow rate of less than 100 m ³ / min, which is relatively small compared to the heat capacity of the adsorption tower inner tank, with a small flow rate of less than 100 m ³ / min, a small amount of thermal deformation, and a low risk of damage such as cracking. Also preferably used.

  Next, a method for regenerating the adsorbent by desorbing the adsorbed organic component from the adsorbent after performing the above-described gas purification treatment for a predetermined time to adsorb the organic component on the adsorbent will be described. .

  When the adsorbent is regenerated, first, the first open / close valve 6a and the second open / close valve 7a are closed to stop the purification process of the gas to be treated, and then the third open / close valve 8a is opened to open the pressurized water that becomes the recovered gas. Steam is introduced into the adsorption tower main body 10 from the second supply line 8 through the second introduction part 34, and the fourth open / close valve 9a is opened to remove the gas (including the recovered gas) in the inner tank 20 from the second. It leads to a capacitor (not shown) through the discharge line 9.

  The recovered gas introduced into the adsorption tower main body 10 from the second introduction part 34 fills the space part between the inner tank 20 and the adsorption tower main body 10 and fills the base 31 and the bottom plate part 24 of the inner tank 20. Then, it is introduced into the inner tank 20 and enters the adsorbent filling part 26. The first porous plate 24b of the bottom plate portion 24 functions as a rectifying plate as described above, and allows the recovered gas to enter the adsorbent filling portion 26 from the entire lower surface of the adsorbent filling portion 26 substantially uniformly.

  Further, the recovered gas that has entered from the lower surface side of the adsorbent filling unit 26 comes into contact with the adsorbent, so that the organic components adsorbed on the adsorbent are desorbed from the adsorbent to the recovered gas, thereby regenerating the adsorbent. Let In particular, in the first embodiment, pressurized water vapor, which is a recovered gas, is introduced into the adsorbent filling unit 26, so that the adsorbent is heated to a predetermined temperature (for example, about 120 ° C.), and the organic component from the adsorbent. Can be efficiently removed.

  Further, in this case, the inner tank 20 is directly heated from the outside by the pressurized steam filling the space between the inner tank 20 and the adsorption tower body 10, and the pressurized steam and the adsorbent that have entered the inner tank 20 Heated by. At this time, since the heat capacities of the body plate part 21, the first end face wall part 22, and the second end face wall part 23 of the inner tub 20 are small as described above, the body plate part 21, the first end face wall part 22, and the first The temperature of the two end wall portions 23 can be easily raised to a predetermined temperature.

  Thereby, at the time of heating of an adsorbent, it arrange | positions to the part which is contacting the inner wall face of the trunk | drum 21, the 1st end surface wall part 22, and the 2nd end surface wall part 23, and the vicinity part of the inner wall surface. Since it is possible to prevent the temperature change of the adsorbent from causing a time delay with respect to the temperature change of the adsorbent disposed in the central portion away from the inner wall surface of the body plate portion 21, the desorption capacity of the entire adsorbent The adsorbent can be regenerated stably and reliably.

  At this time, the inner tub 20 is heated as described above, and the reinforcing member 25 attached to the outer peripheral surface of the body plate portion 21 is also heated by the pressurized steam. In the case of the first embodiment, since the heat capacity of the reinforcing member 25 is small as described above, or because the reinforcing member 25 is partially fixed to the outer peripheral surface of the body plate portion 21 by spot welding, the inner tank Since an excessive thermal stress is hardly generated in 20, it is possible to prevent the body plate portion 21 from being cracked or cracked due to the thermal stress.

  The support member 28 fixed to the inner wall surface of the inner tank 20 is also heated with the heating of the inner tank 20, and the support member 28 has the first and second support portions 29 and 30 as described above. As a result, it is difficult for thermal stress to occur in the inner tank 20, so that it is possible to prevent the inner tank 20 from being cracked or cracked by the attachment of the support member 28.

  Furthermore, in the adsorption tower 1 of the first embodiment, the inner tank 20 is heated and the bottom plate part 24 also thermally expands, but the upper surface of the base part 31 on which the inner tank 20 is placed is slid as described above. Since the dynamic layer 38 is provided, the thermally expanding bottom plate portion 24 can be easily slid with respect to the base portion 31, thereby preventing the bottom plate portion 24 from being worn and also due to thermal stress. It is also possible to prevent the bottom plate portion 24 from being damaged.

  In this case, a pressure loss of the recovered gas occurs when the recovered gas passes from the lower surface side to the upper surface side of the adsorbent filling portion 26. For this reason, although the pressure in the inner tank 20 will be in a state lower than the pressure of the space part between the inner tank 20 and the adsorption tower main body 10, although an internal-external pressure difference will arise in the inner tank 20, 1st Embodiment In the inner tub 20, as described above, the reinforcing member 25 is attached to the outer peripheral surface of the trunk plate portion 21, and the first and second end wall portions 22 and 23 are formed thicker than the trunk plate portion 21. Therefore, the inner tank 20 can be prevented from being greatly deformed or damaged under the influence of the internal / external pressure difference.

  Then, as described above, after the recovered gas passes through the adsorbent from the lower surface side to the upper surface side, the organic component is desorbed from the adsorbent, and then the recovered gas containing the desorbed organic component is the second perforated plate 27 flows into the upper space in the inner tub 20 through 27 and is further introduced into a capacitor (not shown) through the second discharge part 35 and the second discharge line 9. In this capacitor, the recovered gas containing the organic component is cooled to separate and recover the organic component from the recovered gas. Further, the recovered gas from which the organic component has been separated by the condenser is discharged to the outside or reused by being circulated to the recovery gas supply means.

  As described above, according to the adsorption tower 1 of the first embodiment, the pressurized water vapor, which is the recovered gas, enters the adsorbent, so that the adsorbent is substantially equally efficient in the cross section perpendicular to the gas entry direction by the pressurized water vapor. The adsorption capacity of the adsorbent can be stably recovered because the adsorbent can be effectively desorbed by heating.

  After the adsorbent regeneration process with the recovered gas is performed for a predetermined time in this manner, the regeneration process is stopped by closing the third on-off valve 8a and the fourth on-off valve 9a, and then the first on-off valve 6a and the second on-off valve are opened and closed. By opening the valve 7a, the purification process of the gas to be processed as described above is started again.

  The fifth open / close valve 15a is opened for a predetermined time in the time zone of the regeneration process so that a part of the recovered gas is condensed and the condensate staying at the bottom of the adsorption tower body 10 is To the outside. In this case, a steam trap can be provided instead of the fifth on-off valve 15a, and the condensate generated in the adsorption tower body 10 can be continuously discharged. Further, the fifth on-off valve 15a is appropriately opened even during the purification process of the gas to be treated, so that a part of the recovered gas remaining in the adsorption tower body 10 is condensed and stays at the bottom of the adsorption tower 10. It is possible to discharge the condensate out of the adsorption tower 10.

  In the first embodiment, when the gas to be treated is purified, the gas to be treated is introduced from the first introduction part 32 into the inner tank 20 and passed through the adsorbent from the top to the bottom. When the adsorbent regeneration process is performed, the recovered gas is introduced into the adsorption tower main body 10 from the second introduction section 34, and the adsorbent is directed from the bottom to the top. After passing through, it is discharged from the second discharge portion 35.

  However, in the present invention, the direction in which the gas to be processed and the recovered gas are passed through the adsorbent is not particularly limited. For example, in the first embodiment, when the gas to be processed is purified, 2 It is also possible to introduce into the adsorption tower body 10 from the introduction part 34, pass it through the adsorbent from the bottom to the top and then discharge it from the second discharge part 35, and perform the adsorbent regeneration process At this time, it is also possible to introduce the recovered gas into the inner tank 20 from the first introduction part 32 and allow the adsorbent to pass through the adsorbent from the top to the bottom and then discharge it from the first discharge part 33. Further, the gas to be treated is introduced into the inner tank 20 from the first introduction part 32 and discharged from the first discharge part 33, and the recovered gas is introduced into the inner tank 20 from the second discharge part 35. 2 It is also possible to discharge from the introduction part 34.

  As described above, the adsorption tower 1 of the first embodiment is configured by reducing the heat capacities of the body plate part 21, the first end face wall part 22, and the second end face wall part 23 in the inner tank 20. The temperature of the inner tank 20 can be easily changed, so that when the adsorbent is cooled or heated, the adsorbent is arranged in a plane perpendicular to the inflow direction of the gas to be treated or the recovered gas. It is possible to prevent a time delay in the temperature change of the adsorbent depending on the position, and to appropriately exhibit the adsorption / desorption capability of the entire adsorbent.

  At the same time, the problem of the strength reduction and the generation of thermal stress of the body plate part 21 caused by reducing the heat capacity of the body plate part 21, the first end face wall part 22 and the second end face wall part 23 of the inner tub 20, The structure of the reinforcing member 25 and the support member 28 as described above eliminates the occurrence of cracks and cracks in the inner tank 20.

  Therefore, according to the adsorption tower 1 of the first embodiment, the purification treatment of the gas to be treated by the adsorbent is performed efficiently and stably without causing cracks or cracks in the inner tank 20 over a long period of time. Therefore, the concentration of the organic component in the gas to be processed can be greatly reduced as compared with the conventional case without causing a short path problem.

  Furthermore, since the adsorbent regeneration process using the recovered gas can be performed efficiently, the adsorption capacity of the adsorbent can be stably recovered. For this reason, by performing the purification process of the gas to be treated and the regeneration process of the adsorbent with the recovered gas alternately, the above-described excellent adsorbent adsorption capacity can be maintained for a long period of time.

  Next, the adsorption tower which concerns on 2nd Embodiment is demonstrated. Here, FIG. 6 is a cross-sectional view showing an adsorption tower according to the second embodiment. In addition, in the adsorption tower 2 which concerns on 2nd Embodiment, it represents using the same code | symbol about the component and member which have the substantially same structure and the same function as the adsorption tower 1 which concerns on the above-mentioned 1st Embodiment. Therefore, the description thereof will be omitted.

  The adsorption tower 2 according to the second embodiment includes an adsorption tower main body 40, a base portion 49 disposed on the bottom surface portion of the adsorption tower main body 40, an inner tank 45 placed on the base portion 49, and an inner tank 45. And the first and second introduction parts 32 and 34, the first and second discharge parts 33 and 35, and the third discharge part 14. The tank 45 is configured as a vertical (tubular) adsorption tower arranged along the vertical direction.

  The adsorption tower body 40 includes a body portion 41 formed in a cylindrical shape along the vertical direction, a first spherical surface portion 42 disposed on the upper end portion of the body portion 41, and a first portion disposed on the lower end portion of the body portion 41. 2 spherical portions 43. In this case, the height of the body 41 of the adsorption tower body 40 is 4.5 m, and the diameter is set to 3 m. The wall thickness of the adsorption tower body 40 is set to 9 mm. A heat insulating material (not shown) can be attached to the outer peripheral surface of the adsorption tower body 40.

  In the present invention, the shape and dimensions of the adsorption tower main body 40 are not particularly limited and can be arbitrarily changed. For example, the body portion 41 of the adsorption tower main body 40 in the second embodiment is a rectangular tube. It may be configured in a shape.

  The first spherical surface portion 42 of the adsorption tower body 40 is formed with an insertion hole through which the first introduction portion 32 and the second discharge portion 35 are inserted. Further, the first introduction part 32 and the second discharge part 35 are held by the first spherical part 42 via an elastically deformable seal member 36 serving as a first thermal stress relaxation means. The second discharge part 35 is provided with an elastically deformable telescopic flexible tube 16 serving as a second thermal stress relaxation means.

  The first discharge part 33 and the second introduction part 34 in the second embodiment are extended from the body part 41 in directions opposite to each other. In addition, the third discharge portion 14 is suspended downward from the second spherical surface portion 43. In the present invention, the arrangement positions of the first introduction part 32, the first discharge part 33, the second introduction part 34, the second discharge part 35, and the third discharge part 14 can be appropriately changed. is there.

  The base portion 49 of the second embodiment includes a pair of support columns 49a erected from the second spherical surface portion 43 of the adsorption tower body 40 and a plurality of structural steels (H-shaped) spanned between the pair of support columns 49a. Steel) 49b. In this case, the pair of support columns 49a are arranged in parallel to each other. Each shape steel 49b is arranged with a pitch of 60 cm or more and 100 cm or less in a direction perpendicular to the support column 49a.

  The inner tank 45 includes a body plate portion 46 that accommodates the adsorbent therein, a bottom plate portion 47 that is fixed to the lower end of the body plate portion 46, and a continuous reinforcing member 25 that reinforces the body plate portion 46. The first end face wall portion 22 and the second end face wall portion 23 provided in the inner tub 20 in the first embodiment are not provided.

  The body plate portion 46 of the second embodiment is made of a metal such as stainless steel, and has a cylindrical side wall (wall body) whose center axis direction is the vertical direction, and a spherical surface so as to close the upper end portion of the side wall. And a ceiling (lid).

  The strength of the inner tank 45 is increased by forming the side wall of the body plate portion 46 in a cylindrical shape. For example, even if a pressure difference (internal / external pressure difference) occurs between the inner space and the outer space of the inner tank 45. The body plate portion 46 is difficult to deform. Further, when the gas to be processed or the recovered gas is introduced into the inner tank 45, the gas to be processed or the recovered gas is easily spread to every corner in the inner tank 45 and is in contact with the inner wall surface of the body plate portion 46. The gas to be treated or the recovered gas can be easily distributed to the adsorbent and the adsorbent disposed in the vicinity of the inner wall surface.

  Note that the body plate portion 46 in the second embodiment is configured such that the cross section perpendicular to the central axis direction has a circular shape, but in the present invention, the side wall of the body plate portion is formed in a rectangular cylindrical shape. And the trunk-plate part may be comprised so that the cross section orthogonal to a center-axis direction may show a rectangle by comprising the ceiling of a trunk-plate part in a square pyramid shape.

  In this case, the thickness of the body plate portion 46 is set to 2 mm, which is thinner than the thickness of the adsorption tower body 40 in order to reduce the heat capacity of the body plate portion 46. Further, on the ceiling of the body plate part 46, a first introduction part 32 that directly introduces the gas to be treated into the inner tank 45, and a second exhaust part 35 that exhausts the recovered gas that has passed through the adsorbent from the inner tank 45. Are integrally formed using the same metal material as the body plate portion 46.

  The bottom plate portion 47 of the inner tank 45 is composed of a grating member 24a formed by assembling steel materials in a lattice shape, and a first perforated plate 24b fixed on the grating member 24a and having a plurality of holes. ing.

  The reinforcing member 25 in the second embodiment is predetermined by spot welding in a state in which the reinforcing member 25 is continuously in contact with the outer peripheral surface of the body plate portion 46 along the circumferential direction orthogonal to the central axis direction of the body plate portion 46. Are partially fixed to the outer peripheral surface of the body plate portion 46 at a plurality of positions spaced apart from each other. Each reinforcing member 25 has a substantially L-shaped cross section. In this reinforcing member 25, the thickness of the first plate piece portion that contacts the outer peripheral surface of the body plate portion 46, and the first plate piece portion The plate thickness dimension of the second plate piece standing up with respect to each is set to 3 mm.

  In the second embodiment, since the body plate portion 46 is configured to have a circular cross section as described above, for example, the body plate portion 46 itself has a strength that can withstand the internal / external pressure difference of the inner tank 45. In the case where it can be appropriately secured by the structure, the reinforcement member 25 can be omitted.

  An adsorbent filling portion (activated carbon layer) 26 is formed in the inner tank 45 by uniformly filling the adsorbent from the bottom plate portion 47 to a predetermined height, and on the upper surface side of the adsorbent filling portion 26. The circular second porous plate 27 is supported by a support member 28 so as to cover the adsorbent.

  The adsorption tower 2 according to the second embodiment performs the purification process of the gas to be treated and the regeneration process of the adsorbent by the recovered gas in the same manner as the adsorption tower 1 according to the first embodiment described above. Is possible.

In this adsorption tower 2, since the heat capacity is reduced by reducing the thickness of the body plate portion 46 in the inner tank 45, the temperature of the inner tank 45 can be easily changed. Thereby,
As in the case of the adsorption tower 1 according to the first embodiment described above, when the adsorbent is cooled or heated, the adsorbent is prevented from being partially delayed in the temperature change of the adsorbent. It is possible to appropriately exhibit the entire adsorption / desorption capability.

  Also, in the adsorption tower 2 of the second embodiment, as in the case of the adsorption tower 1 according to the first embodiment described above, it is possible to prevent the inner tank 45 from being cracked or cracked, and to use an adsorbent. The purification process of the gas to be treated and the regeneration process of the adsorbent with the recovered gas can be performed efficiently and stably over a long period of time.

  In the second embodiment, when performing purification treatment of the gas to be treated, the gas to be treated is introduced from the first introduction part 32 into the inner tank 45 and passed through the adsorbent from the top to the bottom. It is discharged from the first discharge unit 33 later, and when the adsorbent regeneration process is performed, the recovered gas is introduced into the adsorption tower main body 40 from the second introduction unit 34, and the adsorbent is directed from below to above. And then discharged from the second discharge portion 35.

  However, also in the second embodiment, as in the case of the first embodiment described above, the direction in which the gas to be processed and the recovery gas pass through the adsorbent can be changed as necessary. It is also possible to pass the gas to be treated through the adsorbent from the bottom to the top, and to pass the recovered gas through the adsorbent from the top to the bottom.

Hereinafter, although an Example is shown and it demonstrates concretely about the adsorption tower which concerns on this invention, this invention is not limited to this at all.
Using the adsorption tower 1 according to the first embodiment shown in FIG. 1, purification treatment of exhaust gas containing acetone gas exhausted in the production process of acetate fiber was performed. In this case, the adsorption tower body 10 of the adsorption tower 1 is composed of SS400, and the thickness of the body part 11, the first spherical part 12 and the second spherical part 13 in the adsorption tower body 10 is set to 9 mm. . Further, as described in the above-described embodiment, the dimension in the height direction of the body portion 11 of the adsorption tower body 10 is set to 2 m, and the dimension in the length direction is set to 6 m.

  In the inner tank 20 of the adsorption tower 1, activated carbon is filled to a height of 1 m from the bottom plate portion 24 to form an activated carbon layer 26. The body plate part 21, the first end face wall part 22, and the second end face wall part 23 of the inner tank 20 are all made of stainless steel. Further, the thickness of the body plate portion 21 of the inner tank 20 is set to 2 mm as described in the above-described embodiment, and the thickness of the first end surface wall portion 22 and the second end surface wall portion 23 is It is set to 5 mm.

  In this case, with respect to the area where the adsorbent filled in the inner tank 20 is in contact with the body plate part 21, the first end face wall part 22 and the second end face wall part 23, the adsorbent is only on the body plate part 21. The ratio of the contact area is 74%, thereby reducing the influence of the temperature change of the entire adsorbent from the first end face wall portion 22 and the second end face wall portion 23, and reducing the entire adsorbent. It was made possible to quickly cool or heat to a predetermined temperature.

  For such an adsorption tower 1, first, the third on-off valve 8a and the fourth on-off valve 9a are opened, and water vapor with a vapor pressure of 0.15 MPa is used as a recovery gas from the second introduction section 34 to enter the inside of the adsorption tower main body 10. Thus, the adsorbent regeneration process was performed for a predetermined time to restore the adsorption capacity of the adsorption tower 1. After the regeneration process, the third on-off valve 8a and the fourth on-off valve 9a were closed, and the first on-off valve 6a and the second on-off valve 7a were opened to purify the gas to be treated. Further, the fifth opening / closing valve 15 a was appropriately opened during the purification treatment, and the condensate staying at the bottom of the adsorption tower 10 was discharged out of the adsorption tower 10.

At this time, an exhaust gas having an acetone concentration of 25%, which is the lower explosion limit, is introduced as the gas to be treated at an introduction rate of 100 m ³ / min from the first introduction part 32 of the adsorption tower 1, and the activated carbon packed part (activated carbon layer). ) At a wind speed of 300 mm / sec, the acetone component was adsorbed on the activated carbon and removed from the exhaust gas.

  In order to examine the concentration of acetone in the exhaust gas purified under such conditions, the exhaust gas discharged from the adsorption tower 1 through the first discharge unit 33 and flowing through the first discharge line 7 is collected, and the acetone is collected. Concentration was measured. As a result, the acetone concentration in the purified exhaust gas showed an extremely low value of 30 ppm or less on average even from the start of adsorption with low adsorption efficiency to the end of adsorption where adsorption breakthrough progressed to some extent.

  Further, after the exhaust gas purification process was performed for a predetermined time, the first on-off valve 6a and the second on-off valve 7a were closed to stop the purification process, and the adsorbent regeneration process described above was performed again. The operation of the adsorption tower 1 is performed for one year by alternately performing the exhaust gas purification process and the adsorbent regeneration process at predetermined times, and repeating the exhaust gas purification process and the adsorbent regeneration process a plurality of times per day. Continued.

  During the operation of the adsorption tower 1 for one year, the average value of the acetone concentration of the exhaust gas subjected to the purification treatment was determined monthly, and the average acetone concentration of each month was 30 ppm or less. Further, after one year, when the inner tank 20 of the adsorption tower 1 was examined for damage to the body plate part 21, the first end face wall part 22, and the second end face wall part 23, the body plate part 21, first end face was examined. No cracks or cracks were observed in the face wall portion 22 and the second end face wall portion 23. Further, when the sliding of the bottom plate portion 24 with respect to the base portion 31 was also examined, the bottom plate portion 24 was not worn or damaged although a sliding trace within the assumed range was observed.

DESCRIPTION OF SYMBOLS 1, 2 Adsorption tower 6 1st supply line 6a 1st on-off valve 7 1st discharge line 7a 2nd on-off valve 8 2nd supply line 8a 3rd on-off valve 9 2nd discharge line 9a 4th on-off valve 10 Adsorption tower main body 11 Body part 12 First spherical part 13 Second spherical part 14 Third discharge part 15 Third discharge line 15a Fifth open / close valve 16 Telescopic flexible tube 20 Inner tank 21 Body plate part 22 First end face wall part 23 Second end face wall Part 24 Bottom plate part 24a Grating member 24b First perforated plate 25 Reinforcing member 25a First plate piece part 25b Second plate piece part 26 Adsorbent filling part (activated carbon layer)
27 Second perforated plate 28 Support member 29 First support part 29a Welding piece part 29b Supporting piece part 29c Protruding part 30 Second support part 30a Long hole 31 Base part 31a First shape steel 31b Second shape steel 32 First introduction part 33 First discharge part 34 Second introduction part 35 Second discharge part 36 Seal member 37 Guide member 38 Sliding layer 39 Welding part 40 Adsorption tower body 41 Body part 42 First spherical part 43 Second spherical part 45 Inner tank 46 Body Plate part 47 Bottom plate part 49 Base part 49a Post 49b Section steel (H-section steel)

Claims (12)

A metal adsorption tower body (10, 40) having an internal space, a metal inner tank (20, 45) disposed in the adsorption tower body (10, 40), and the inner tank (20, 45) an adsorbent filled therein, and the inner tank (20, 45) includes a body plate portion (21, 46) constituting a side wall and a ceiling, and a body plate portion (21, 46). A bottom plate portion (24, 47) provided at the lower end portion and provided with an opening through which gas passes, and by introducing the gas to be processed into the inner tank (20, 45), A predetermined organic component contained is adsorbed on the adsorbent to purify the gas to be treated, and a recovery gas is introduced into the inner tank (20, 45) to remove the organic component from the adsorbent. An adsorption tower (1,2) for recovering and regenerating the adsorbent,
The thickness of the body plate portion (21, 46) is set to be thinner than the thickness of the adsorption tower body (10, 40),
An adsorption tower characterized by that. The adsorption tower body (10) and the inner tank (20) have a horizontal structure arranged along the horizontal direction,
The side wall of the body plate portion (21) is composed of a pair of wall bodies facing each other,
The ceiling of the body plate portion (21) is disposed across the upper ends of the pair of wall bodies,
The inner tub (20) has a pair of end face wall portions (22, 23) disposed at both ends in the horizontal direction of the body plate portion (21),
Each end face wall part (22,23) is comprised by the metal plate of 1 sheet which is thicker than the said body board part (21), and has thickness thinner than the said adsorption tower main body (10). The adsorption tower according to 1.   The reinforcing member (25) continuous along the circumferential direction perpendicular to the longitudinal direction of the body plate portion (21) is fixed to the outer peripheral surface of the body plate portion (21) by spot welding. The adsorption tower described. The adsorption tower body (40) and the inner tank (45) have a vertical structure arranged along the vertical direction,
The side wall of the body plate portion (46) is constituted by a wall body formed in a cylindrical shape,
The ceiling of the body plate portion (46) is configured by a lid that closes an upper end portion of the wall body,
The adsorption tower according to claim 1.   A reinforcing member (25) continuous along a circumferential direction perpendicular to the central axis direction of the body plate portion (46) is fixed to the outer peripheral surface of the body plate portion (46) by spot welding. 4. The adsorption tower according to 4. The reinforcing member (25) includes a first plate piece portion (25a) having a contact surface with the outer peripheral surface of the body plate portion (21, 46), and a second plate rising from the first plate piece portion (25a). With one part (25b),
The thickness of the first and second plate pieces (25a, 25b) is such that the thermal expansion / contraction speed of the reinforcing member (25) is substantially the same as the thermal expansion / contraction speed of the body plate (21, 46). Set to
The adsorption tower according to claim 3 or 5.   The adsorption tower according to claim 6, wherein the thickness of the first and second plate pieces (25a, 25b) is set to be not more than 1 mm larger than the thickness of the barrel plate (21, 46). . The inner tank (20, 45) is placed in the adsorption tower body (10, 40), and gas is circulated to the bottom plate part (24, 47) of the inner tank (20, 45). Possible base (31,49) is arranged,
Between the base part (31, 49) and the bottom plate part (24, 47) of the inner tub (20, 45), the base part (31, 49) during thermal expansion and contraction of the bottom plate part (24, 47). ) Is provided with sliding means (38) for sliding the bottom plate portion (24, 47).
The adsorption tower in any one of Claims 1-7. A first introduction part (32) for introducing the gas to be treated into the inner tank (20, 45), and a first exhaust for discharging the gas to be treated from which the organic components have been removed through the adsorbent. A part (33), a second introduction part (34) for introducing the recovered gas into the adsorption tower body (10, 40), and the organic component recovered from the adsorbent through the adsorbent. A second discharge part (35) for discharging the recovered gas,
The first introduction part (32) and the second discharge part (35) are directly connected to the inner tank (20, 45) from the outside via the adsorption tower body (10, 40),
An elastically deformable seal member (36) is interposed between the first introduction part (32) and the second discharge part (35) and the adsorption tower body (10, 40). The second thermal stress relaxation means and / or the second introduction part (32) and the second discharge part (35) are provided with an elastically deformable telescopic flexible pipe (16). Thermal stress relaxation means is arranged,
The adsorption tower in any one of Claims 1-8.   A perforated plate (27) arranged in the inner tank (20, 45) and rectifying before introducing the gas to be treated into the adsorbent, and fixed to the inner wall surface of the inner tank (20, 45), The adsorption tower according to any one of claims 1 to 9, further comprising a support member (28) for supporting the porous plate (27).   The support member (28) is disposed between a plurality of first support portions (29) fixed to the inner wall surface and at least two of the first support portions (29) and each first support portion. The adsorption tower according to claim 10, further comprising a second support portion (30) held so as to be relatively displaceable with respect to (29). The volatile organic compound is introduced into the inner tank (20,45) of the adsorption tower (1,2) according to any one of claims 1 to 11 by introducing a gas to be treated containing the volatile organic compound. To purify the gas to be treated by adsorbing the adsorbent to the adsorbent, and
Introducing the recovered gas into the inner tank (20,45) of the adsorption tower (1,2) to recover the volatile organic compound from the adsorbent and regenerate the adsorbent;
The processing method using the adsorption tower characterized by comprising.

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