JP2010149066A - Activated carbon column of gas treatment apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an activated carbon column of a gas treatment apparatus with which miniaturization is made easy. <P>SOLUTION: In the activated carbon column 10 of a gas treatment apparatus for adsorbing a solvent in an object gas to be treated in activated carbon 14 and desorbing the solvent by heating the activated carbon 14 adsorbing the solvent, a first electrode 30 is installed in the outer circumferential wall of the cylindrical activated carbon column 10 while being brought into contact with the activated carbon set therein and is earthed; a columnar or cylindrical second electrode 32 is installed in the center axis of the inside of the activated carbon column 10 while being electrically insulated from the first electrode 30; activated carbon 14 exists between the first and the second electrodes 30 and 32, and voltage is applied between the first and the second electrodes 30 and 32 and electric current is applied to the activated carbon 14 to generate Joule heat, heat the activated carbon 14, and thus desorb a solvent. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an activated carbon tower of a gas treatment device for purifying a solvent contained in a gas to be treated discharged from a process using a solvent.

There is a growing interest in environmental pollution, and it is required to purify and discharge the gas to be treated including the solvent discharged in the process using the solvent and to recover the solvent. Therefore, as a gas processing apparatus for purifying the gas to be processed containing this solvent, for example, the technique described in Japanese Patent Application Laid-Open No. 7-39717 is as follows. A treated gas containing a solvent is introduced into an activated carbon tower containing activated carbon, and the solvent contained in the treated gas is adsorbed by the incorporated activated carbon, and the purified gas is discharged from the activated carbon tower as a purified gas. The activated carbon that has adsorbed the solvent is heated by a heater, the solvent is desorbed from the activated carbon, and the solvent is recovered by an appropriate means. Two activated carbon towers are arranged, and adsorption and desorption of the solvent are alternately performed in each activated carbon tower. As a heating means for desorbing the solvent from the activated carbon, Japanese Patent Application Laid-Open No. 7-256098 provides electrodes so as to be in contact with the upper and lower ends of the activated carbon incorporated in the activated carbon tower, and a voltage is applied between the two electrodes. A technique for generating heat by applying an electric current to the activated carbon to generate heat is shown. As another heating means, a large number of pipes are arranged inside the activated carbon tower so that the activated carbon built in the activated carbon tower is heated by heat conduction, and high temperature steam is allowed to flow through these pipes. There is also.
JP 7-39717 A Japanese Patent Laid-Open No. 7-256098

  As a means of heating the activated carbon adsorbed with the solvent, the technique of supplying current to the activated carbon disclosed in Japanese Patent Application Laid-Open No. 7-256098 is not a large-scale device, and a large number of pipes are arranged inside the activated carbon tower. Compared to an apparatus in which high-temperature steam is caused to flow through these pipes, the size can be easily reduced.

  In the technique proposed in Japanese Patent Laid-Open No. 7-256098, reliable insulation is necessary so that the voltage applied to the electrode does not leak to the outer peripheral wall of the activated carbon tower. By the way, in order to desorb the solvent from the activated carbon adsorbed with the solvent, the activated carbon may be heated to about 200 degrees, but in order to completely regenerate the activated carbon, it is necessary to heat to about 800 degrees or more. Therefore, if the regeneration of activated carbon is taken into consideration, an attempt to manufacture a durable device due to the thermal expansion of the insulator has to be a large device.

  The present invention has been made in view of the circumstances of the prior art, and provides an activated carbon tower of a gas processing apparatus that is easy to downsize for purifying a solvent in a gas to be treated and discharging purified gas. Objective.

  In order to achieve this object, the activated carbon tower of the gas treatment apparatus of the present invention adsorbs the solvent in the gas to be treated with activated carbon, heats the activated carbon adsorbed with the solvent, and desorbs the solvent from the activated carbon. In the activated carbon tower of the gas processing apparatus, a first electrode is disposed on an outer peripheral wall of the activated carbon tower so as to contact the built-in activated carbon, and the first electrode is grounded, and the first electrode is disposed inside the activated carbon tower. A second electrode is provided in an insulated state from the first electrode so that the activated carbon is interposed between the first and second electrodes, and a voltage is applied between the first and second electrodes. And it is comprised so that an electric current may be sent through the activated carbon and it may produce heat.

  The activated carbon tower is cylindrical, the outer peripheral wall of the activated carbon tower is used as the first electrode, and the columnar or cylindrical second electrode is disposed at the position of the cylindrical central axis. Can be configured.

  Furthermore, it is also possible to configure so that an AC voltage is applied to the first and second electrodes via a transformer in which the primary side and the secondary side are insulated.

  In the activated carbon tower of the gas treatment device according to claim 1, the first electrode is disposed on the outer peripheral wall of the activated carbon tower so as to be in contact with the built-in activated carbon and the first electrode is grounded. There is no need to insulate the wall and the first electrode, and the structure is simple. In addition, since the second electrode is disposed inside the activated carbon tower in an insulated state from the first electrode so that the activated carbon is interposed between the first and second electrodes, the second electrode is formed on the activated carbon. It is in the enclosed state, and the arrangement of the second electrode is sufficient with a simple structure. Therefore, it is easy to downsize the activated carbon tower.

  In the activated carbon tower of the gas treatment device according to claim 2, since the activated carbon tower is cylindrical and the outer peripheral wall of the activated carbon tower is the first electrode, the outer peripheral wall of the activated carbon tower is made of heat resistant and conductive such as stainless steel. The first electrode can be easily configured by forming the metal having the property. And since the columnar or cylindrical second electrode is disposed at the position of the cylindrical central axis, the distance to the outer peripheral wall as the first electrode becomes equal, and the current flows evenly to the activated carbon. Heat can be generated evenly.

  Furthermore, the activated carbon tower of the gas treatment device according to claim 3 applies an AC voltage to the first and second electrodes via a transformer in which the primary side and the secondary side are insulated. Regardless of the polarity of the AC voltage on the side, the first electrode on the outer peripheral wall can be grounded.

  Hereinafter, embodiments of the activated carbon tower of the gas processing apparatus of the present invention will be described with reference to FIGS. FIG. 1 is a block diagram of an activated carbon tower of the gas treatment apparatus of the present invention. FIG. 2 is a diagram showing a heating means using an AC voltage as a power source. FIG. 3 is a diagram showing a heating means using a DC voltage as a power source. FIG. 4 is a block diagram showing a state in which the solvent is adsorbed by the first activated carbon tower and the solvent is desorbed by the second activated carbon tower in the activated carbon tower of the gas treatment apparatus shown in FIG. FIG. 5 is a block diagram showing a state in which the solvent is desorbed by the first activated carbon tower and the solvent is adsorbed by the second activated carbon tower in the activated carbon tower of the gas treatment apparatus shown in FIG. FIG. 6 is a time table for the on-off valve, blower, and energization heating of the activated carbon tower of the gas treatment apparatus shown in FIG.

  In FIG. 1, two activated carbon towers are provided. Inside the cylindrical first and second activated carbon towers 10 and 12 with the vertical axis as the axis, a plurality of holes having diameters through which the activated carbon 14-1 and 14-2 cannot pass are formed at least in the lower part. An inflow chamber 16-1 and 16-2 are formed in the lower part inside the activated carbon tower, respectively. Further, discharge chambers 18-1 and 18-2 are formed in spaces above the activated carbons 14-1 and 14-2 in the first and second activated carbon towers 10 and 12. In addition, a floor having a large number of holes is provided inside the first and second activated carbon towers 10 and 12 so as to be in contact with the upper ends of the activated carbons 14-1 and 14-2, and the upper part is discharged. The chambers 18-1 and 18-2 may be used. And the flow path which flows in the raw | natural gas as a to-be-processed gas containing a solvent via the 1st on-off valves 20-1 and 20-2 is opening into each lower inflow chamber 16-1 and 16-2. Has been. In addition, in the lower inflow chambers 16-1 and 16-2, inactive nitrogen gas or the like through the blowers 22-1 and 22-2 and the second on-off valves 24-1 and 24-2 in series. A flow path through which gas flows is opened. Further, in the upper discharge chambers 18-1 and 18-2, passages through which purified gas flows out through the third on-off valves 26-1 and 26-2 are opened. The upper discharge chambers 18-1 and 18-2 are opened with flow paths through which the solvent-enriched gas containing the solvent is concentrated via the fourth on-off valves 28-1 and 28-2. ing. The opening of the second on-off valves 24-1 and 24-2 and the rotation (ON) of the blowers 22-1 and 22-2 are interlocked.

  The outer peripheral walls of the cylindrical first and second activated carbon towers 10 and 12 are formed of a metal having heat resistance and conductivity, such as stainless steel, and also function as the first electrodes 30-1 and 30-2. In addition, the first electrodes 30-1 and 30-2 as the outer peripheral walls are grounded. In addition, a second electrode 32-1 formed of a metal having heat resistance and conductivity such as cylindrical or columnar stainless steel at the position of the axial center of the cylindrical first and second activated carbon towers 10 and 12, 32-2 is disposed. Of course, the second electrodes 32-1 and 32-2 are configured to be insulated from the first electrodes 30-1 and 30-2. The second electrodes 32-1 and 32-2 are appropriately supported and fixed by the lower floor and the upper floor inside the first and second activated carbon towers 10 and 12 or other means. The activated carbons 14-1 and 14-2 are built in between the lower and upper floors of the first and second activated carbon towers 10 and 12, and the first electrodes 30-1 and 30-2 and the second electrodes are incorporated. Activated carbon 14-1 and 14-2 are interposed between 32-1 and 32-2. Further, as shown in FIG. 2, as an example, an AC voltage 36 as a power source is connected to a switch 38 and transformers 34-1 and 34-2 in which the primary side and the secondary side are insulated in series. The next side is applied between the first electrodes 30-1 and 30-2 and the second electrodes 32-1 and 32-2, respectively. As another example, as shown in FIG. 3, the DC voltage 40 as a power source is connected to the first electrodes 30-1 and 30-2 and the second electrodes 32-1 and 32-2 via the switch 38. May be applied to each of them. A voltage is applied between the first electrodes 30-1 and 30-2 and the second electrodes 32-1 and 32-2, and a current is supplied to the activated carbons 14-1 and 14-2 to generate heat by Joule heat. Thus, a heating means is configured.

  The operation of the activated carbon tower of the gas processing apparatus having such a configuration will be described. First, the adsorption of the solvent is performed in the first activated carbon tower 10. When an appropriate amount of solvent is adsorbed on the activated carbon 14-1 of the first activated carbon tower 10, the solvent is desorbed in the first activated carbon tower 10 and the solvent is removed in the second activated carbon tower 12. It is switched so that adsorption is performed. Therefore, when an appropriate amount of solvent is adsorbed on the activated carbon 14-2 of the second activated carbon tower 12, the first activated carbon tower 10 again adsorbs the solvent and the second activated carbon tower 12 removes the solvent. It is switched so that desorption is performed. In this way, the first activated carbon tower 10 and the second activated carbon tower 12 alternately adsorb the solvent, and the other second, activated carbon tower 12 and first activated carbon tower 10 alternately desorb the solvent. Made. The state where the first activated carbon tower 10 adsorbs the solvent and the second activated carbon tower 12 desorbs the solvent is as shown in FIG. 4 of the flow path connected to the first activated carbon tower 10. The first on-off valve 20-1 and the third on-off valve 26-1 are opened, the second on-off valve 24-1 and the fourth on-off valve 28-1 are closed, and the blower 22-1 is rotated. (OFF), no voltage is applied between the first electrode 30-1 and the second electrode 32-1 of the first activated carbon tower 10. Then, the first on-off valve 20-2 and the third on-off valve 26-2 in the flow path connected to the second activated carbon tower 12 are closed, the fourth on-off valve 28-2 is opened, A voltage is applied between the first electrode 30-2 and the second electrode 32-2 of the second activated carbon tower 12. When switching between adsorption and desorption is performed, the solvent is desorbed in the first activated carbon tower 10 and the solvent is adsorbed in the second activated carbon tower 12, as shown in FIG. The first on-off valve 20-1 and the third on-off valve 26-1 in the flow path connected to the first activated carbon tower 10 are closed, the fourth on-off valve 28-1 is opened, and the first activated carbon A voltage is applied between the first electrode 30-1 and the second electrode 32-1 of the tower 10. Then, the first on-off valve 20-2 and the third on-off valve 26-2 in the flow path connected to the second activated carbon tower 12 are opened, the fourth on-off valve 28-2 is closed, No voltage is applied between the first electrode 30-2 and the second electrode 32-2 of the second activated carbon tower 12. The state shown in FIGS. 4 and 5 shows a basic process part of adsorption and desorption. Before the process is switched, the second on-off valves 24-1 and 24-2 are opened and the blower is opened. −22-1 and 22-2 are rotated (ON), and an operation slightly different from the state shown in FIGS. 4 and 5 is performed.

  The adsorption and desorption will be described in more detail based on the time table of FIG. 6 including the operation before switching the process. In FIG. 4, when the raw gas as the gas to be treated including the solvent flows through the first on-off valve 20-1 in the adsorption at the first activated carbon tower 10, it passes through the gap between the activated carbon 14-1. Thus, the solvent is adsorbed by the activated carbon 14-1, and the purified gas that has been purified is discharged to the outside as the purified gas through the third on-off valve 26-1. When the amount of the solvent adsorbed on the activated carbon 14-1 reaches an appropriate predetermined value, the first on-off valve 20-1 is closed to stop the inflow of the raw gas, and the second on-off valve 24- 1 is opened and the blower 22-1 is rotated (ON). Then, nitrogen gas, which is an inert gas, flows into the first activated carbon tower 10, and the purified gas remaining in the first activated carbon tower 10 is discharged to the outside through the third on-off valve 26-1. The After the nitrogen gas is allowed to flow in for a predetermined amount or for a predetermined time and the inside of the first activated carbon tower 10 is filled with the inert gas, the first activated carbon tower 10 is changed from adsorption to desorption. Can be switched. As shown in FIG. 5, the first activated carbon tower 10 switched to desorption is applied with a voltage between the first electrode 30-1 and the second electrode 32-1, and a current is supplied to the activated carbon 14-1. The activated carbon 14-1 is heated to about 200 degrees by Joule heat, the adsorbed solvent is desorbed from the activated carbon 14-1, and the solvent is concentrated outside through the fourth on-off valve 28-1. It is discharged as a solvent concentrated gas. When the desorption of the solvent from the activated carbon 14-1 is performed to a predetermined value set appropriately, the second on-off valve 24-1 is opened and the blower 22-1 is rotated (ON), so that nitrogen gas is generated. The solvent concentrated gas that has flowed into the first activated carbon tower 10 and has concentrated the desorbed solvent is forcibly discharged to the outside through the fourth on-off valve 28-1. Along with the desorption of the solvent by the application of the voltage, the desorbed solvent is forcibly discharged for a while, and then the application of the voltage is stopped and the desorption is stopped. After that, when the activated carbon 14-1 is cooled by the flowing nitrogen gas and the activated carbon 14-1 is lowered to a predetermined temperature and exhibits a desired adsorption action, the second on-off valve 24-1 is closed. And the rotation of the blower 22-1 is stopped. In this way, desorption is completed, and the first activated carbon tower 10 is switched to adsorption again. The operation of the second activated carbon tower 12 is the same as the operation of the first activated carbon tower 10 as long as the first activated carbon tower 10 is in an adsorption state, and desorption may be performed in the opposite direction. Omitted.

  In the activated carbon tower of the gas treatment apparatus of the present invention having such a configuration, the first electrodes contacting the outer peripheral walls of the first and second activated carbon towers 10 and 12 with the built-in activated carbon 14-1 and 14-2. 30-1 and 30-2, and since the first electrodes 30-1 and 30-2 are grounded, the outer peripheral walls of the first and second activated carbon towers 10 and 12 and the first electrode 30-1, It is not necessary to make 30-2 in an insulating state, the structure is extremely simple, and the size can be easily reduced. In addition, second electrodes 32-1 and 32-2 are disposed inside the first and second activated carbon towers 10 and 12, and the first electrodes 30-1 and 30-2 and the second electrode 32- Since the activated carbons 14-1 and 14-2 are interposed between 1 and 32-2, the second electrodes 32-1 and 32-2 are surrounded by the activated carbons 14-1 and 14-2. In addition, the arrangement of the second electrodes 32-1 and 32-2 is sufficient with a simple structure. Accordingly, it is easy to downsize the first and second activated carbon towers 10 and 12. And if the 1st and 2nd activated carbon towers 10 and 12 are made into a cylindrical shape and the outer peripheral wall is formed of a metal having heat resistance and conductivity such as stainless steel, the first electrodes 30-1 and 30-2 are used. Can be configured easily. In addition, if the columnar or cylindrical second electrodes 32-1 and 32-2 are disposed at the position of the cylindrical central axis, the distance to the outer peripheral wall becomes uniform, and the first electrode 30-1, The thickness of the activated carbon 14-1 and 14-2 between the 30-2 and the second electrodes 32-1 and 32-2 is uniform around the axis, and the current flowing through the activated carbon 14-1 and 14-2 is also around the axis. Can flow evenly and generate heat evenly. In addition, the first electrode 30-1, 30-2 and the second electrode 32-1, 32 are further connected to the AC voltage 36 through transformers 34-1 and 34-2 in which the primary side and the secondary side are insulated. -2 to each other, the first electrodes 30-1 and 30-2 on the outer peripheral wall can be grounded regardless of the polarity of the AC voltage 36 on the power supply side.

  In addition, in the said Example, although the 1st and 2nd activated carbon towers 10 and 12 are provided, you may switch adsorption | suction and desorption alternately with one activated carbon tower. Further, three or more activated carbon towers may be provided, and the number of adsorption and desorption may be appropriately set by connecting the activated carbon towers in series and in parallel. Then, the AC voltage 36 may be converted into a DC voltage by an appropriate known means and applied between the first electrodes 30-1 and 30-2 and the second electrodes 32-1 and 32-2. Furthermore, by passing a large current between the first electrodes 30-1 and 30-2 and the second electrodes 32-1 and 32-2, the activated carbons 14-1 and 14-2 are heated to a high temperature of about 800 degrees. It is possible to completely regenerate the activated carbons 14-1 and 14-2 by heating.

It is a block diagram of the activated carbon tower of the gas treatment apparatus of the present invention. It is a figure which shows the heating means which uses alternating voltage as a power supply. It is a figure which shows the heating means which uses DC voltage as a power supply. FIG. 2 is a block diagram showing a state in which the solvent is adsorbed by the first activated carbon tower and the solvent is desorbed by the second activated carbon tower in the activated carbon tower of the gas treatment device shown in FIG. 1. FIG. 2 is a block diagram showing a state in which the solvent is desorbed by the first activated carbon tower and the solvent is adsorbed by the second activated carbon tower in the activated carbon tower of the gas treatment device shown in FIG. 1. It is a timetable of the on-off valve, blower, and energization heating of the activated carbon tower of the gas processing apparatus shown in FIG. It is a longitudinal cross-sectional view of the measurement cell shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 1st activated carbon tower 12 2nd activated carbon tower 14-1, 14-2 Activated carbon 16-1, 16-2 Inflow chamber 18-1, 18-2 Exhaust chamber 20-1, 20-2 1st on-off valve 22-1 and 22-2 blowers 24-1 and 24-2 second on-off valves 26-1 and 26-2 third on-off valves 28-1 and 28-2 fourth on-off valves 30-1 and 30- 2 1st electrode 32-1, 32-2 2nd electrode 34-1, 34-2 Transformer 36 AC voltage 38 Switch 40 DC voltage

Claims (3)

In the activated carbon tower of the gas treatment apparatus that adsorbs the solvent in the gas to be treated by activated carbon, heats the activated carbon that has adsorbed the solvent and desorbs the solvent from the activated carbon, The first electrode is disposed so as to be in contact with the activated carbon, the first electrode is grounded, and the second electrode is disposed inside the activated carbon tower so as to be insulated from the first electrode. The activated carbon is interposed between the first electrode and the second electrode, and a voltage is applied between the first and second electrodes so that a current is passed through the activated carbon to generate heat. Activated carbon tower of gas processing equipment. 2. The activated carbon tower of the gas treatment device according to claim 1, wherein the activated carbon tower is cylindrical, the outer peripheral wall of the activated carbon tower is the first electrode, and the columnar or cylindrical shape is located at the position of the central axis of the cylindrical shape. An activated carbon tower of a gas processing apparatus, wherein the second electrode is provided. The activated carbon tower of the gas treatment device according to claim 1 or 2, wherein an AC voltage is applied to the first and second electrodes via a transformer in which the primary side and the secondary side are insulated. The activated carbon tower of the gas processing device that is characterized.