TWI407999B - Activated regenerator for activated carbon, and gas purifying method and apparatus using the same - Google Patents

Abstract

Provided is a compact activated carbon regenerative furnace (regenerating method) to facilitate incorporation into gas purification apparatuses; further provided are a gas purification method and apparatus that use the activated carbon regenerative furnace and enable the rate of removal of chemical substances in exhaust gas to be kept at a high level over a long period. The activated carbon regenerative furnace is provided with an activated carbon supply section (21) for supplying activated carbon (K) having lowered adsorption capacity, an activated carbon regenerating section (22) wherein is formed a moving bed through which the supplied activated carbon flows downward due to gravity, and the activated carbon (K) is regenerated by the activated carbon (K) and water vapor (V) being brought into countercurrent contact in the presence of heat in the moving bed and a water gasification reaction being induced, a cooling section (26) for cooling the regenerated activated carbon, and an activated carbon discharge section (27) for discharging the cooled activated carbon. The weight ratio (WV/WK) of the flow rate (WV)(kg/h) of the water vapor and the flow rate (WK)(kg/h) of the activated carbon that are brought into countercurrent contact is preferably set to 0.05-1.0.

Description

Activated carbon activated regeneration furnace, gas purification method and device using same

The present invention relates to an activated carbon regeneration furnace and a gas purification method and apparatus using the same. In particular, the present invention relates to a gas purification method and a purification apparatus for recovering an organic solvent contained in exhaust gas or removing harmful substances and malodorous substances in exhaust gas; and further, an activated regeneration method for activated carbon and an activated regeneration furnace for use in gas When the adsorption capacity of the activated carbon used in the purification device is lowered, the adsorption capacity is restored.

The previously known gas purifying device (gas treating device) is used for adsorbing and removing solvent components such as harmful, malodorous substances or organic solvents in a gas discharged from a factory or the like, using a solid adsorbent particle, and purifying the gas and recovering the solvent component. .

(Patent Document 1) discloses a gas processing apparatus that continuously supplies solid adsorbent particles to a gas adsorbing portion of a gas to be processed, and a gas adsorbing portion that adsorbs a solvent component continuously adsorbs the adsorbent particles to the adsorbent. The regeneration unit feeds and regenerates the adsorbed particles, and regenerates the regenerated adsorbed particles to the gas to be treated adsorption unit, thereby continuously recycling the adsorbent particles. The non-condensable gas is supplied to the adsorbent regeneration unit, whereby the solvent component adsorbed to the adsorbent particles is removed, and the solvent component with the separation is introduced into the condensation separator, whereby the solvent component is separated and recovered.

In the prior art, the adsorbent was regenerated by the solvent component to be regenerated to restore the adsorption capacity. However, if the device is continuously used for a long period of time, the heavy substance or the solid matter gradually accumulates inside and outside the adsorbent without completely detaching. As a result, there is a problem that the adsorption capacity of the adsorbent is lowered, so that the removal rate of the chemical substance in the exhaust gas is lowered.

The adsorbent having a reduced adsorption capacity needs to be taken out of the apparatus, and after being externally activated and regenerated, it is returned to the gas treatment device or discarded, and the gas treatment device is replenished with a new adsorbent. Therefore, it is preferred to assemble an activated regenerative furnace for recovering the capacity of the adsorbent having a reduced adsorption capacity as part of the gas treatment apparatus.

When activated carbon is used as the adsorbent, activation and regeneration of activated carbon having a decreased adsorption capacity can be carried out by the same method as the activation treatment in the production of activated carbon. The activation and regeneration method of activated carbon is roughly classified into a drug activation method using a drug such as zinc chloride, and a gas activation method using water vapor or carbon dioxide. In general, the activation of a drug has problems such as separation and separation of a carbon material from a drug, and the like, and has a disadvantage of high cost. Therefore, a gas activation method using water vapor is often used. As the means for carrying out the steam activation, a rotary kiln, a flow activation furnace, a multi-stage flow furnace or the like can be used. However, when a rotary kiln or a flow activation furnace is used, since the carbon material is mixed in the apparatus, it cannot be continuously processed, but is only operated in a batch mode, and is not suitable as a conventional continuous gas treatment apparatus as described above. Device. Further, in the flow activation furnace or the multi-stage flow furnace, as the activating gas, a high-temperature combustion gas obtained by burning a coke oven gas or a fuel having a high hydrogen content such as LPG or LNG is usually used. The gas system contains 10 to 50% of a non-oxidizing gas, and since it can also be used for heating of a carbon material, the amount of the activating gas relative to the amount of the carbon material becomes extremely large. In such a device, the amount of carbon material that can be charged into the furnace is 20% relative to the volume of the furnace. Under the circumstance, there are very few defects, and the disadvantage of the large size of the device becomes an obstacle to assembling the activated regeneration furnace in the gas treatment device.

Patent Document 1: Japanese Patent Laid-Open No. 52-14580

In view of the foregoing previous circumstances, an object of the present invention is to provide an activated regeneration furnace (activated regeneration method) which is easy to be assembled in a gas purification apparatus and which is small in activated carbon, and further aims to provide a gas purification method and apparatus for the purpose of utilizing the activity The carbon activated regenerator maintains the high rate of chemical removal in the exhaust gas for a long time.

The present inventors have found that by forming a moving layer which causes the activated carbon to flow down by gravity, the moving layer is heated to an activation temperature by externally heating or induction heating, so that substantially 100% of water vapor is relatively The method of countercurrent contacting of activated carbon under flow can miniaturize the activated carbon activation regenerator. Further, it has been found that in the gas purifying apparatus which repeats the adsorption and desorption steps using activated carbon as an adsorbent, the activated carbon is activated by the hydrous gasification reaction by the activated carbon activated regeneration furnace by taking a certain amount from the activated carbon of the desorbed chemical substance. The adsorption capacity is restored and then supplied to the adsorption step to solve the aforementioned problems. That is, the activated carbon regeneration activation method, the activation regeneration furnace, and the gas purification method and apparatus of the present invention are as follows.

(1) An activated carbon regeneration regeneration method comprising: an active carbon supply step of supplying activated carbon having a decreased adsorption capacity; forming a moving layer for flowing the supplied activated carbon by gravity, and causing activated carbon in the movable layer With water vapor in An active carbon regeneration step of regenerating activated carbon by heating, a cooling carbon regeneration step of cooling the regenerated activated carbon, and an activated carbon discharge step of discharging the cooled activated carbon.

(2) The activated carbon regeneration regeneration method according to (1) above, wherein the weight ratio of the flow rate W _V (kg/h) of the countercurrent contact water vapor to the flow rate W _K (kg/h) of the activated carbon (W) _V / W _K ) is 0.05 to 1.0.

(3) A gas purification method comprising: a step of contacting a gas containing a chemical substance with activated carbon to adsorb the chemical substance to activated carbon; and bringing a non-condensable gas into contact with the activated carbon of the adsorbed chemical substance, a step of disengaging the chemical substance; the activated carbon from which the chemical substance is detached is again supplied to the activated carbon recycling step of the adsorption step; and a part of the activated carbon from which the chemical substance has been removed is taken out, so that the activated carbon taken out is formed by gravity a moving layer that flows down, in which the activated carbon is brought into countercurrent contact with water vapor under heating, an activated carbon regeneration step of regenerating activated carbon by causing a water gasification reaction; a cooling step of cooling the regenerated activated carbon; The cooled activated carbon is supplied again to the activated carbon discharge step of the aforementioned adsorption step.

(4) An activated carbon activated regeneration furnace comprising: an activated carbon supply unit for supplying activated carbon having a reduced adsorption capacity; and a moving layer for flowing the supplied activated carbon by gravity, in the moving layer An activated carbon regeneration portion that regenerates activated carbon and water vapor under heating to regenerate activated carbon by causing a water gasification reaction; a cooling portion for cooling the regenerated activated carbon; and for discharging the cooled activated carbon Activated carbon discharge section.

(5) The activated carbon activated regeneration furnace according to the above (4), which is provided with a temperature gradient for forming a temperature gradient in which the temperature in the moving layer rises in the direction of gravity unit.

(6) The activated carbon activated regeneration furnace according to the above (5), which is provided with a heating portion for forming a temperature gradient having a maximum difference of 200 ° C or higher.

(7) A gas purifying apparatus comprising: contacting a gas containing a chemical substance with activated carbon to adsorb the chemical substance to an adsorption portion of activated carbon; and contacting the non-condensable gas with activated carbon of the adsorbed chemical substance; a detachment portion for separating the chemical substance; the activated carbon from which the chemical substance has been detached is again supplied to the activated carbon circulation portion of the adsorption portion; and a part of the activated carbon from which the chemical substance has been detached is taken out, and the activated carbon taken out is formed by gravity And the moving layer flowing down, in which the activated carbon is brought into countercurrent contact with the water vapor under heating, the activated carbon regeneration portion of the activated carbon is regenerated by causing the water gasification reaction; and the cooling portion of the regenerated activated carbon is cooled; The cooled activated carbon is discharged and supplied again to the activated carbon discharge portion of the adsorption portion.

The present specification includes the contents described in the specification and/or drawings of Japanese Patent Application No. 2008-320180, which is the priority of the present application.

According to the activated carbon regeneration activation method and the activated regeneration furnace of the present invention, by the formation of the gravity moving layer of activated carbon, the mixing of the activated carbon can be suppressed, and the activated carbon can be continuously activated. In addition, since the gravity moving layer is used, the amount of activated carbon can be increased, and the activation regenerator can be miniaturized. Further, since the pore structure of activated carbon is developed, even a small amount of 100% water vapor can be uniformly activated and regenerated. Therefore, it is easy to assemble the activated regeneration furnace to the activated carbon circulation type continuous gas purification apparatus. Further, in the activated carbon regeneration furnace of the present invention, spherical activated carbon having good fluidity can be preferably used.

Further, according to the gas purifying method and the purifying apparatus of the present invention, the decrease in the adsorption capacity of the activated carbon can be suppressed, and the removal rate of the chemical substance in the exhaust gas can be maintained at a high value for a long period of time. Further, it is not necessary to take out the activated carbon having a reduced adsorption capacity from the apparatus, and the activated activated carbon can be continuously activated in the operation of the gas purifying apparatus.

Hereinafter, the present invention will be described in detail based on embodiments.

An embodiment of the gas purifying apparatus of the present invention is shown in Figs. 1 and 2 . The gas purifying device is roughly configured to: adsorb the chemical substance in the raw gas to the adsorption portion A of the activated carbon; the gas sealing portion B; the separation portion C that brings the non-condensable gas into contact with the activated carbon to separate the chemical substance; a raw gas purification tower 1 (FIG. 1) composed of a sealing portion D; and an activated carbon activation regeneration portion for extracting activated carbon from a portion of the activated carbon from which the chemical has been removed, and regenerating activated carbon (Fig. 2 Activated carbon activated regeneration furnace 2).

The air flow transport pipe 11 is disposed at the center of the tower body 1, and the activated carbon K is transported from the lower portion of the tower body 1 to the upper portion of the adsorption portion A by the transport gas Gb, thereby forming a circulation path of the activated carbon K.

The air flow conveying pipe 11 is not necessarily disposed in the tower body 1.

The adsorption unit A is provided with a plurality of perforated plates 12, and the activated carbon K forms a fluid layer having a flow layer height of 15 to 20 mm on the perforated plate 12, and the flow direction of each of the segments is successively descended downward. The raw gas G containing a chemical substance such as a solvent component is introduced into the column body 1 from below the adsorption unit A, and rises while uniformly contacting the activated carbon K flowing down. Meanwhile, the chemical substance in the raw gas G is adsorbed on the activated carbon K, and the purified raw gas G is from the upper part of the tower body 1 to the atmosphere. release.

As such an activated carbon K, various activated carbons can be used, but spherical activated carbon particles having a small particle diameter, true sphericality, and high hardness are preferable because they have a good fluidity and a large adsorption speed. Further, although the particle diameter and the bulk density of the activated carbon are not particularly limited, a nominal mesh (JIS Z8801) has a nominal mesh size (JIS Z8801) and a 1000 μm sieve retention portion (residual) is 5% by weight or less, and the nominal mesh 600 is used. The μm sieve passes through part (pass) to 5% by weight, and the bulk density (new carbon) is 0.55 to 0.61 g/ml of activated carbon. As a preferable example, the spherical activated carbon "G-BAC" by KUREHA company is mentioned.

The activated carbon K of the adsorbing chemical substance is introduced into the vertical path 13 which shows the gas sealing effect, and then moves to the lower part C of the lower part. The detachment portion C is composed of, for example, a shell & tube type heat exchanger 14, and the activated carbon K flows down the tube and is indirectly heated by water vapor H from the shell side. The activated carbon K that flows down is in countercurrent contact with the introduced non-condensable gas Ga from the lower portion of the detachment portion C, thereby desorbing the adsorbed chemical substance. The non-condensable gas herein may be a gas substance at a pressure of 0 ° C, and examples thereof include nitrogen, oxygen, hydrogen chloride, and air.

The non-condensable gas Ga is introduced into the condenser 15 along with the detached chemical substance from the detachment portion C, so that the chemical substance is cooled and liquefied and recovered. In addition, the recovered non-condensable gas Ga of the chemical substance is recycled again in the system.

The activated carbon K that has been desorbed from the chemical substance is transported to the upper portion of the tower body 1 by the transport gas Gb in the air flow transport pipe 11 functioning as the activated carbon circulation unit, and is again supplied to the adsorption unit A.

As described above, it is understood that the activated carbon K is regenerated by removing the solvent component by the separation portion C. However, if the device is continuously used for a long period of time, the chemical substance is used. One of the parts is heavy, accumulated in the pores of the activated carbon K, and the like. Therefore, in the present invention, a part of the activated carbon K from which the chemical substance has been removed is taken out of the system and transferred to the activated carbon activated regeneration furnace 2 constituting the adsorbent activated regeneration unit shown in Fig. 2.

As shown in FIG. 2, the activated carbon K whose adsorption capacity is taken out from the tower body 1 is supplied from the activated carbon supply unit 21 to the activated carbon activation regeneration furnace 2. The activated carbon supply unit 21 is formed with, for example, an opening 21a to which a device such as a funnel or a screw feeder can be connected.

In the activated carbon regeneration unit 22 in the activated carbon activation regenerator 2, the activated carbon K introduced from the upper portion of the furnace forms a gravity-moving layer that flows down by gravity, and on the other hand, substantially supplies 100% of water from the steam supply unit 23. The vapor V is in countercurrent contact with the activated carbon K under gravity flow. In the activated carbon regeneration unit 22, it is important to form a moving layer so as not to cause mixing of particles in the moving direction of the activated carbon K as much as possible. When the mixing of activated carbon becomes intense, the activation regeneration of activated carbon produces unevenness.

The hydrogen, carbon monoxide or unreacted water vapor generated by the water gasification reaction of the water vapor V and the activated carbon K supplied to the activated carbon activation regeneration furnace 2 is discharged to the outside of the furnace through the gas discharge unit 24. For example, as shown in FIG. 2, the gas discharge portion 24 is composed of an opening 24a provided in the furnace wall and a funnel-shaped partition 24b disposed inside the furnace.

It is preferable that the activated carbon supply unit 21 is provided in the vicinity of the furnace roof together with the gas discharge unit 24. Preferably, the activated carbon supply unit 21 is disposed above the discharge unit 24, and is filled with activated carbon filled in the upper portion and the leg portion of the funnel-shaped separator 24b to prevent the exhaust gas from flowing into the activated carbon supply unit 21. Exhaust gas from the heap The surface of the activated carbon accumulated around the leg portion of the funnel-shaped separator 24b is discharged to the outside of the furnace through the opening 24a.

As the steam supply unit 23, the same structure as the gas discharge unit 24 described above can be employed. For example, as shown in Fig. 2, it may be constituted by an opening 23a provided in the furnace wall and a funnel-shaped partition 23b disposed inside the furnace. The water vapor V, which is substantially supplied from the opening 23a, flows into the active carbon regeneration unit 22 from the surface of the activated carbon layer around the leg portion of the funnel-shaped separator 23b, and rises in the moving layer of activated carbon.

The activated carbon activation regeneration furnace 2 is provided with a heating unit 25 to heat the activated carbon K and the water vapor V so as to have a high temperature of, for example, 600 to 900 °C. According to this, the heavy product or the like accumulated in the activated carbon K reacts with water vapor, and is converted into carbon monoxide and hydrogen by the water gasification reaction, and the activated carbon K is almost completely regenerated. Further, the activated carbon itself reacts with the heavy product, and although it loses a part, its amount is about 1% by weight relative to the treated activated carbon.

In the heating unit 25, a heat generating element is disposed outside the furnace wall, and the activated carbon itself is heated by induction heating, or a conductor such as a metal disposed in the furnace is heated by induction heating to indirectly heat. Activated carbon and water vapor, etc. By introducing 100% steam and heating the activated carbon (moving layer) without heating by air, the gas velocity (flow velocity) in the activated carbon regeneration portion 22 can be made small, and a moving layer can be formed (gas line speed is higher) When the large amount of activated carbon flows, it is difficult to form a stable moving layer).

The heating unit 25 may be set to have a uniform temperature throughout the entire gravity moving layer. However, it is preferably a temperature gradient in which the temperature in the gravity moving layer rises in the direction of gravity. Therefore, the heating portion 25a on the upper side of the furnace can be set At a low temperature (for example, 600 ° C), the heating portion 25d on the lower side is relatively set to a high temperature (for example, 900 ° C). The temperature gradient can be a discontinuous gradient of temperature phase changes or a continuously varying gradient. Further, it is preferable that the maximum difference of the temperature gradient is controlled to 200 ° C or more.

By forming a temperature gradient in the gravity layer as described above, the activated carbon K moving under the flow can be exchanged with the rising steam V to achieve efficient use of heat, and the activated carbon K can be gradually heated to avoid sharp water coal gasification. The reaction can smoothly carry out the activation regeneration of activated carbon K.

In the activated carbon activation regenerator 2, the weight ratio (W _V /W _K ) of the flow rate _{V V} (kg/h) of the countercurrent contact water vapor V to the flow rate W _K (kg/h) of the activated carbon K is 0.05 to 1.0. Preferably. When the ratio is less than 0.05, the water gasification reaction is not sufficiently generated, and the regeneration rate of activated carbon is lowered. Conversely, when the ratio is larger than 1.0, the water vapor increase rate in the furnace is increased, and it is difficult to form a stable moving layer. . Further, in order to fix the flow rate of the water vapor, the rising speed is small, and it is necessary to make the cross-sectional area of the furnace large, and if the installation area is large, the industrial use value is lowered, which is not preferable.

The activated activated carbon K is cooled by the cooling unit 26, taken out from the bottom of the activated carbon activated regeneration furnace 2 by the activated carbon 27, and supplied to the adsorption unit A of the tower body 1 again. The activated carbon discharge unit 27 has a function of discharging the activated and regenerated activated carbon K to the outside of the furnace, and is constituted, for example, by an opening provided at the bottom.

Preferably, the moving speed of the activated carbon K is adjusted by the activated carbon shift adjusting mechanism 28 to control the amount of activated carbon (the residence time in the activated carbon activated regeneration furnace). The activated carbon moving speed adjusting mechanism 28 can be exemplified by a spiral type powder and particle transfer device connected to the activated carbon discharge unit 27, or a gas. Flow transfer type granular material conveying device, etc. Further, the moving speed of the activated carbon K can be adjusted by providing a flow restricting means such as a hole in the middle of the moving layer.

Preferably, in the activated carbon activation regenerator 2, activated carbon is activated and regenerated in such a manner that the residence time of the activated carbon K in the highest temperature range (the highest temperature to the highest temperature - 50 ° C) is in the range of 0.5 to 4 hours. The size of the device of the furnace 2, the configuration of the heating unit 25, and the like.

The ratio of the flow rate (W1) of the activated carbon K passing through the detachment portion C in the column body 1 to the flow rate (W2) of the activated carbon K taken out from the activated carbon activation regenerator 2 (activated regeneration rate: W2/W1), In view of the degree of decrease in the adsorption capacity of the activated carbon or the concentration of the chemical substance in the raw gas containing the chemical substance, it is preferably set to a value that maintains the removal rate of the chemical substance within a certain value or more. If the activation regeneration rate is small, the decrease in the adsorption capacity of the activated carbon cannot be suppressed, and the removal rate of the chemical substance is lowered, which is not preferable. Further, when the activation regeneration rate is increased, the consumption of the coal gasification reaction due to activated carbon in the activated carbon activation regeneration furnace 2 is increased. A control portion (not shown) is provided at a portion where the tower body 1 and the activated carbon activation regeneration furnace 2 are connected to control the amount of extraction so that the flow ratio of activated carbon is in an appropriate range. The control unit is constituted by, for example, a screw feeder or a gas transfer type powder or granule transfer device.

Further, it is preferable that the activated carbon activation regenerating furnace 2 is disposed in the casing and is prevented from invading the combustible gas by maintaining the high pressure higher than the atmospheric pressure by the clean air or the inert gas in the casing. Further, it is preferable that the activated carbon K flows to the inlet and the outlet of the activated carbon activation regenerating furnace 2, and prevents the air from being mixed by nitrogen sealing or the like. When the supply pressure of nitrogen is lowered, the activated carbon can be activated to regenerate the furnace for safety. The mechanism that automatically stops.

By the gas purifying device as described above, chemical substances in a gas discharged from a factory or the like, such as toluene, xylene, MEK, phenol, naphthalene, other volatile organic compound (VOC) components of IPA, or malodorous substances such as fertilizers can be used. , removes with high efficiency and purifies exhaust gas.

In the embodiment of Fig. 1, the adsorption unit and the separation unit are shown as being provided in one column, but the adsorption unit and the separation unit may be configured as individual towers. For example, the adsorption unit and the separation unit are configured as individual towers, and are connected by an air flow transfer tube to circulate the activated carbon in the adsorption unit-disengagement unit-adsorption unit.

Example

Next, the present invention will be described in detail based on examples and comparative examples.

(Examples 1 to 4)

Purification of various raw gases containing a solvent component such as toluene is carried out using a gas purifying apparatus having a tower body having an adsorption section and a separation section as shown in FIGS. 1 and 2 and an activated carbon activated regeneration furnace. As the activated carbon, spherical activated carbon G-BAC manufactured by KUREHA Co., Ltd. was used. In the activated carbon activated regeneration furnace, the device size of the activated carbon activated regeneration furnace and the setting of the heating portion are adjusted so that the residence time of the activated carbon in the highest temperature range (the highest temperature to the highest temperature - 50 ° C) becomes 0.5 to 4 hours. range. Further, the weight ratio (W _V /W _K ) of the flow rate of water vapor to activated carbon in the activated carbon activated regeneration furnace was set to 0.1.

The activation regeneration rate was set as shown in Table 1. Further, as shown in the upper operating temperature to the lower operating temperature in Table 1, a temperature gradient (maximum difference of 250 ° C) in which the temperature rises in the direction of gravity is formed in the gravity moving layer formed in the activated carbon regeneration portion.

The experimental results are shown in Table 1. In any of Examples 1 to 4, the removal rate of the chemical substance was stable at a high level of 85 to 99% during the operation period of 6 months.

(Comparative Example 1)

In the first embodiment, after the gas purifying apparatus was operated for 6 months, the removal of the activated carbon from the activated carbon activation regeneration furnace was stopped, and the evolution of the raw gas was carried out by the configuration of the tower having only the adsorption unit and the separation unit. As a result, the removal rate of toluene gradually decreased from 97%, and decreased to 75% after 6 months. It has been found that in the gas purifying apparatus in which the activated carbon activated regeneration furnace of the present invention is not combined, the removal rate cannot be maintained at a high level for a long period of time.

(Example 5)

After the end of the experiment of Comparative Example 1, the activated carbon activated regeneration furnace was again combined. The gas purification apparatus was operated, and the treatment of the raw gas was carried out under the same conditions as in the first embodiment.

After the start of the operation of the activated carbon activated regeneration furnace, the active carbon of the inlet and outlet of the regeneration furnace was activated by sampling activated carbon at a time point of 1 day, and the amount of toluene adsorbed (the equilibrium adsorption in a gas of 30 ° C, toluene of 800 ppm) was measured. the amount). The result is as follows. The value of the unused activated carbon used for reference but not used for purification is also shown. From these results, it is understood that by the activated carbon activated regeneration furnace of the present invention, the toluene adsorption capacity of activated carbon is restored to the unused activated carbon.

Entrance: 0.18 g/g

Export: 0.37 g/g

Not used: 0.38 g/g

(Example 6)

After completion of the foregoing embodiments of Experimental Example 5, in addition to the flow rate by weight of activated carbon with water vapor activation activated carbon regenerator ratio (W _V / W _K) was changed to 0.01, but at the same operating conditions of Example 5 purification apparatus. After the condition change, the activated carbon was activated by sampling activated carbon at the inlet and outlet of the regeneration furnace, and the amount of toluene adsorption (temperature 30 ° C, equilibrium adsorption amount in a gas of 800 ppm toluene) was measured. The result is as follows. The value of the unused activated carbon used for reference but not used for purification is also shown. When the weight ratio (W _V /W _K ) is set to 0.01, the toluene adsorption energy of the activated carbon can be recovered, but the recovery ability is lowered as compared with the case where the weight ratio (W _V /W _K ) is 0.1.

Entrance: 0.18 g/g

Export: 0.20 g/g

Not used: 0.38 g/g

(Example 7)

After the end of the experiment of Example 6, the purification apparatus was operated under the same conditions as in Example 6, except that the weight ratio (W _V /W _K ) of the flow rate of water vapor to activated carbon in the activated carbon activation regeneration furnace was changed to 2.0. After the change of the conditions, the activated carbon can be activated and regenerated, but the flow of activated carbon in the activated carbon activation regeneration furnace becomes uneven, and the temperature control of the furnace tends to be difficult.

All publications, patents, and patent applications cited in this specification are hereby incorporated by reference herein

1‧‧‧Tower

2‧‧‧Active carbon activated regeneration furnace

11‧‧‧Air transport tube

12‧‧‧Perforated plate

13‧‧‧Vertical Road

14‧‧‧Shell & Tube Heat Exchanger

15‧‧‧Condenser

21‧‧‧Active Carbon Supply Department

21a‧‧‧ Opening

22‧‧‧Active Carbon Recycling Department

23‧‧‧Water Vapor Supply Department

23a‧‧‧ Opening

23b‧‧‧Funnel partition

24‧‧‧ gas discharge department

24a‧‧‧ openings

24b‧‧‧Funnel partition

25‧‧‧ heating department

25a‧‧‧Heating Department

25d‧‧‧heating department

26‧‧‧Department of Cooling

27‧‧‧Active Carbon Emissions Department

28‧‧‧Active carbon moving speed adjustment mechanism

A‧‧‧Adsorption Department

B‧‧‧ gas seal

C‧‧‧Departure

D‧‧‧ gas seal

G‧‧‧ original gas

Ga‧‧‧ non-condensing gas

Gb‧‧‧Transporting gas

H‧‧‧Water Vapor

K‧‧‧ Activated carbon

Fig. 1 is a view showing an embodiment of a tower body of a gas purifying apparatus of the present invention.

Fig. 2 is a view showing an embodiment of an activated carbon activated regeneration furnace of the gas purifying apparatus of the present invention.

2‧‧‧Active carbon activated regeneration furnace

21‧‧‧Active Carbon Supply Department

21a‧‧‧ Opening

22‧‧‧Active Carbon Recycling Department

23‧‧‧Water Vapor Supply Department

23a‧‧‧ Opening

23b‧‧‧Funnel partition

24‧‧‧ gas discharge department

24a‧‧‧ openings

24b‧‧‧Funnel partition

25‧‧‧ heating department

25a‧‧‧Heating Department

25d‧‧‧heating department

26‧‧‧Department of Cooling

27‧‧‧Active Carbon Emissions Department

28‧‧‧Active carbon moving speed adjustment mechanism

K‧‧‧ Activated carbon

V‧‧‧Water Vapor

Claims (6)

An activated carbon regeneration regeneration method comprising: an active carbon supply step of supplying activated carbon having a decreased adsorption capacity; forming a moving layer for flowing the supplied activated carbon by gravity, and causing activated carbon and water vapor in the moving layer a countercurrent contact under heating, an activated carbon regeneration step for regenerating activated carbon by causing a water gasification reaction; a cooling step of cooling the regenerated activated carbon; and an activated carbon discharge step of discharging the cooled activated carbon; wherein the countercurrent contact is performed The weight ratio (W _V /W _K ) of the flow rate W _V (kg/h) of the steam to the flow rate W _K (kg/h) of the activated carbon is 0.05 to 1.0. A gas purification method comprising: a step of contacting a gas containing a chemical substance with activated carbon to adsorb the chemical substance to the activated carbon; and contacting the non-condensable gas with the activated carbon of the adsorbed chemical substance to make the chemical a step of separating the material from the separation; the activated carbon from which the chemical has been detached is again supplied to the activated carbon cycle step of the adsorption step; and extracting a portion of the activated carbon from which the chemical has been removed, forming the activated carbon to be taken down by gravity a moving layer in which the activated carbon and the water vapor are brought into countercurrent contact under heating, an activated carbon regeneration step for regenerating the activated carbon by causing a water gasification reaction; a cooling step of cooling the regenerated activated carbon; and discharging the cooled The activated carbon is supplied again to the activated carbon discharge step of the aforementioned adsorption step. An activated carbon activated regeneration furnace comprising: an activated carbon supply unit for supplying activated carbon having a reduced adsorption capacity; and a moving layer for flowing the supplied activated carbon by gravity, wherein activated carbon is used in the moving layer Water vapor is contacted countercurrently under heating to regenerate by causing water gasification reaction An activated carbon regeneration portion of activated carbon; a cooling portion for cooling the regenerated activated carbon; an activated carbon discharge portion for discharging the cooled activated carbon; and a temperature gradient for forming a temperature in the moving layer to rise in the direction of gravity The heating part. An activated carbon regeneration furnace according to claim 3, comprising: a heating portion for forming a temperature gradient having a maximum difference of 200 ° C or higher. The activated carbon regeneration furnace according to claim 3 is configured such that the residence time of the activated carbon having the highest temperature to the highest temperature of -50 ° C in the moving layer is in the range of 0.5 to 4 hours. A gas purifying device comprising: contacting a gas containing a chemical substance with activated carbon to adsorb the chemical substance to an adsorption portion of the activated carbon; contacting the non-condensable gas with the activated carbon of the adsorbed chemical substance to separate the chemical substance a dissociation portion; the activated carbon from which the chemical substance has been detached is again supplied to the activated carbon circulation portion of the adsorption portion; and a part of the activated carbon from which the chemical substance has been removed is taken out to form a moving layer that causes the extracted activated carbon to flow down by gravity In the moving layer, the activated carbon and the water vapor are brought into countercurrent contact under heating, and the activated carbon regeneration portion of the activated carbon is regenerated by causing the water gasification reaction; the cooling portion of the regenerated activated carbon is cooled; and the cooled activity is discharged. The carbon is supplied again to the activated carbon discharge portion of the adsorption portion.