JP2008222867A - Method for cleaning gasified gas and device for the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for cleaning gasified gas, capable of efficiently recovering its adsorption capacity and maintaining the gas-purification capacity of the device even in the case of decreasing the adsorption capacity of activated carbon by the adsorption of high boiling point hydrocarbon compounds in the gasified gas, and a device for the same. <P>SOLUTION: In the method for cleaning the gasified gas is provided by passing the gasified gas obtained by cracking solid organic materials such as organic waste materials, coal or the like through an activated carbon type adsorbing column 1, and adsorbing dioxin and high boiling point hydrocarbons which are liquid or solid in normal temperature and normal pressure in the gasified gas by the activated carbon, the activated carbon type adsorbing column 1 is made of a moving layer or fluidized layer, the activated carbon is continuously cut out from the activated carbon type adsorbing column 1, and the cut out activated carbon is regenerated at a separately installed regeneration column 5 and then returned to the activated carbon type adsorbing column 1. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a purification method and purification device for gasification gas obtained by pyrolyzing organic waste such as waste plastic and biomass or solid organic matter such as coal, and in particular, the purification of gasification gas using an activated carbon packed tower. The present invention relates to a purification method and a purification device.

  In recent years, effective use of energy has been attracting attention as part of global environmental protection, especially prevention of global warming. Organic waste is a method for effectively using energy of organic waste such as waste plastic and biomass. So-called gasification, which obtains a combustible gas by pyrolyzing the gas, is attracting attention.

  However, combustible gas obtained by gasification, that is, gasification gas contains dioxin due to chlorine contained in organic waste, so it is necessary to remove dioxin when using gasification gas It is. In addition to dioxins, organic waste gasification gases include high-boiling hydrocarbon compounds that are liquid or solid at normal temperature and pressure, such as tar and light oil (in the present specification, simply “high-boiling hydrocarbon compounds”). Here, the boiling point of the “high-boiling hydrocarbon compound” is approximately 60 ° C. or higher).

  These high boiling hydrocarbon compounds have a high vapor pressure even at temperatures below the boiling point and are difficult to remove by cooling, etc., and the high boiling hydrocarbon compounds remaining in the gas condense when the temperature of the gasification gas decreases. In addition, it may cause equipment trouble by adhering to the gas piping and its ancillary equipment. Therefore, it is necessary to remove from gasification gas with dioxin.

  Conventionally, as a technique for removing dioxins in a gas, Patent Document 1 discloses a technique in which dioxins are decomposed by a catalyst layer and the remaining dioxins are adsorbed by an activated carbon layer. However, the technique of this patent document 1 is mainly intended for treating the combustion exhaust gas after burning a combustible substance, and when the technique of patent document 1 is applied to the treatment of gasification gas of organic waste. In the catalyst layer, hydrocarbon gases other than dioxins are also decomposed and soot is generated. Moreover, in the activated carbon layer, the above-described high boiling point hydrocarbon compound is adsorbed in addition to dioxin, and the activity of the activated carbon cannot be maintained. In order to sustain it, it is necessary to always use new activated carbon, which increases operating costs.

  In Patent Document 2, a dust collector such as a bag filter is provided, and powdered activated carbon is blown upstream thereof to form an activated carbon layer on the filter cloth surface of the bag filter, and dioxins are adsorbed on the activated carbon. This technique is disclosed. However, even in the technique of this Patent Document 2, when this is applied to the treatment of gasification gas of organic waste, troubles such as clogging occur due to the above-mentioned high boiling point hydrocarbon compound contained in the gasification gas, Stable operation cannot be continued.

  On the other hand, Patent Document 3 and Patent Document 4 disclose a purification technique using activated carbon to remove hydrocarbons such as solvents and light oil in exhaust gas. However, when the light oil contained in the gasification gas of organic waste is removed by activated carbon, it is difficult to control gas purification because the raw material of the gas is waste and the properties of the raw material are not stable. Since the gasified gas contains not only light oil but also tar, if the gas containing tar is purified by activated carbon, the tar is not easily separated from the activated carbon, and the life of the activated carbon is shortened.

  Patent Documents 5 and 6 disclose a technique for purifying biomass gas (gasification gas) obtained by pyrolyzing biomass using activated carbon. However, with this technology, it is possible to adsorb and remove tar components having a high gas treatment temperature and a high molecular weight and a high boiling point, but they have a low molecular weight, a relatively low boiling point, a high volatility, and a normal temperature. It is impossible to adsorb and remove liquid hydrocarbon compounds, so-called light oil components, under pressure.

  Light oil is cooled in the piping and drained when using gas. Since this drain is a highly volatile flammable oil, it is difficult to handle. In addition, in the case of gasification gas using raw materials other than biomass with uniform properties, the generation amount and properties of tar may change, the activated carbon adsorption layer may be clogged, and light oil may flow to the gas utilization facility, causing problems. There is sex. In particular, when fossil fuels such as waste plastics and coal, or solid organic substances made from fossil fuels are gasified, the amount of tar and light oil is large, and the above-mentioned technique cannot perform sufficient purification. .

  As described above, various techniques for purifying gas using activated carbon have been proposed in the past. However, when purifying gasification gas containing a high boiling point hydrocarbon compound, particularly tar and light oil, the above-mentioned problems are required. However, gasification gas purification technology using activated carbon has not been established.

  On the other hand, a gasification gas purification technique that does not use activated carbon has also been proposed. For example, Patent Document 7 discloses a technology for reducing tar content and light oil content in gasified gas by gasification of organic waste, reaction with oxygen and water vapor, and reforming reaction at a high temperature of about 1100 ° C. Proposed. However, gas purification technology using such a reforming reaction requires partial combustion of the gasified gas in order to obtain a heat source required for the reforming reaction. There is a problem of lowering. In addition, the production of oxygen used for the reforming reaction requires a lot of energy, and the total energy required for waste treatment becomes too large.

  As another gas cleaning technology, as seen in coke oven gas purification technology, there is a technology in which gas is cleaned with oil at a low temperature to remove tar content and light oil content in the gas. However, with this technique, energy is required to obtain a cold heat source for cleaning at low temperatures. Moreover, advanced treatment is required for the waste water after washing, and further, a step of regenerating oil and the like is required, and facilities such as treatment of gas generated at the time of regeneration tend to be complicated. Further, dioxins cannot be removed by gas cleaning.

  Thus, in order to purify the gas by simultaneously removing high-boiling hydrocarbon compounds such as dioxin, tar, and light oil in the gas, it is useful and simple to dry-process using activated carbon. Establishing gasification gas purification technology using methane is desired.

On the other hand, when an organic substance is thermally decomposed to obtain a combustible gasification gas, it is desirable to keep hydrocarbon gas such as methane and keep gas calorie high when using the gasification gas. In this case, however, tar and light oil are by-produced and hinder gas utilization. Therefore, also from this point of view, establishment of a purification technique for removing tar and light oil in gasified gas is desired.
JP 2003-111201 A JP-A-11-230529 JP-A-9-215908 JP 2005-66503 A JP 2006-16469 A JP 2006-16470 A JP 2004-238535 A

  The problem to be solved by the present invention is to establish a purification technology for gasification gas using activated carbon and obtain a usable high calorie gas.

  Specifically, even if the adsorption capacity of the activated carbon is reduced due to the adsorption of the high-boiling hydrocarbon compound in the gasification gas, the adsorption capacity can be efficiently recovered and the gas purification capacity of the apparatus can be maintained. An object of the present invention is to provide a purification method and a purification device for gasification gas.

  In the present invention, gasification gas obtained by pyrolyzing organic waste or solid organic matter such as coal is passed through an activated carbon type adsorption tower, and the activated carbon is dioxin in the gasification gas and liquid or solid at normal temperature and normal pressure. In the purification method of gasification gas that adsorbs a certain high-boiling hydrocarbon compound, the activated carbon adsorption tower is used as a moving bed or fluidized bed, activated carbon is continuously cut out from this activated carbon adsorption tower, and the cut activated carbon is installed separately. It is characterized by returning to the activated carbon adsorption tower after regenerating in the tower.

  In the present invention, waste plastic is typically gasified as organic waste, or coal is gasified as solid organic matter.

  The organic waste or solid organic gasification gas contains dioxin and a high-boiling hydrocarbon compound. High boiling point hydrocarbon compounds include tar components such as naphthalene and anthracene (polymer hydrocarbon compounds having 10 or more carbon atoms) and light oil components such as benzene, toluene and xylene (low carbon number of less than 10). Molecular hydrocarbon compounds). These dioxins and high boiling point hydrocarbon compounds need to be removed for effective utilization of the gasification gas. In the present invention, as described above, the gasification gas is passed by passing the gasification gas through an activated carbon adsorption tower. Dioxins and high-boiling hydrocarbon compounds contained in the combustible gas are removed.

  In other words, the activated carbon packed in the activated carbon adsorption tower has numerous pores on the surface, and the pores are adsorbed and removed from the gasification gas when dioxin and polymer hydrocarbon compound molecules enter. The

  Here, the adsorption capacity of the activated carbon packed in the activated carbon adsorption tower gradually decreases with the adsorption of dioxin and the polymer hydrocarbon compound. For this reason, generally, a plurality of activated carbon adsorption towers are installed in parallel, and the activated carbon adsorption tower used for adsorption and the activated carbon adsorption tower to be regenerated are sequentially switched and used. On the other hand, in the present invention, the activated carbon adsorption tower is a moving bed or a fluidized bed, and activated carbon is continuously cut out from the activated carbon adsorption tower, and the cut activated carbon is regenerated in a regeneration tower separately installed, and then activated carbon type. Since it was returned to the adsorption tower, the activated carbon can be regenerated at the same time while using the activated carbon adsorption tower for adsorption. Therefore, as in the prior art, continuous operation is possible without installing a plurality of activated carbon adsorption towers, and the facility layout can be made compact.

  In order to carry out this gasification gas purification method, the purification apparatus of the present invention passes the gasification gas obtained by pyrolyzing organic waste or solid organic matter such as coal through an activated carbon adsorption tower, In a purification apparatus for gasification gas that adsorbs dioxins in gasification gas and high-boiling hydrocarbon compounds that are liquid or solid at normal temperature and pressure, the activated carbon adsorption tower is a moving bed or fluidized bed. A cutting device that continuously cuts the activated carbon, a regeneration tower that regenerates the activated carbon cut by the cutting device, and an activated carbon transfer device that returns the activated carbon regenerated by the regeneration tower to the activated carbon adsorption tower are provided.

  In the present invention, it is preferable to provide a plurality of activated carbon adsorption layers in series in the gas flow direction in the activated carbon adsorption tower. The organic waste or solid organic gasification gas contains a large amount of high-boiling hydrocarbon compounds having various molecular weights. Therefore, when multiple activated carbon adsorption layers are provided in series in the gasification gas flow direction in the activated carbon adsorption tower and gasification gas is passed therethrough, more high boiling hydrocarbon compounds are adsorbed in the activated carbon adsorption layer on the upstream side. And a high-boiling hydrocarbon compound having a large molecular weight is selectively adsorbed.

  Therefore, the activated carbon adsorption layer on the upstream side increases the cut-out rate of activated carbon for regeneration (the cut-out amount per unit time) so that it can be regenerated in a short time, while the activated carbon adsorption layer on the downstream side allows the activated carbon cut-off rate. Can be delayed. In addition, if necessary, the regeneration tower can be divided into an upstream activated carbon adsorption layer and the other, and only the regeneration temperature of the activated carbon in the upstream activated carbon adsorption layer can be increased. Further, the upstream activated carbon adsorption layer can be used as a prefilter.

  In this way, when multiple activated carbon adsorption layers are provided in series in the gasification gas flow direction in the activated carbon adsorption tower, it is possible to set appropriate regeneration conditions for each of the activated carbon usage conditions, reducing running costs. Can be reduced. On the other hand, when there is only one activated carbon adsorption layer, both the light oil component with a small molecular weight and the tar component with a large molecular weight are adsorbed on one activated carbon adsorption layer. If it does so, in order to make the tar content which is hard to detach | leave from activated carbon as the reproduction | regeneration conditions of activated carbon, it is necessary to raise the cutting speed and regeneration temperature of activated carbon uniformly, and a running cost becomes high.

  In the present invention, the regeneration tower for regenerating activated carbon is preferably a moving bed or a fluidized bed. When the regeneration tower is a fixed bed, the regeneration of the activated carbon by the regeneration tower is a batch type, but the regeneration of the activated carbon can be a continuous type by using the regeneration tower as a moving bed or a fluidized bed. Further, as described above, the gasification gas contains a large amount of high-boiling hydrocarbon compounds, and activated carbon has a large amount of adsorption of this high-boiling hydrocarbon.

  Therefore, when this activated carbon is regenerated, for example, by passing steam through a regeneration tower, a large amount of steam is required, and if the regeneration tower is a fixed bed, that is, a batch processing type, the steam consumption when switching regeneration. Greatly fluctuates, leading to load fluctuations in other equipment that uses steam, such as steam turbines, and the efficiency decreases. On the other hand, if the regeneration tower is a moving bed or a fluidized bed, regeneration can be performed continuously, so that load fluctuations are also suppressed.

  Moreover, in this invention, it is preferable to use a screw conveyor or a rotary valve as a cutting device. Thus, by using a screw conveyor or a rotary valve as a cutting device, the gasification gas in the activated carbon adsorption tower is sealed with activated carbon, and the gasification gas in the activated carbon adsorption tower is prevented from flowing out of the system. In addition, oxygen on the outside air side can be prevented from entering the activated carbon adsorption tower and generating an explosive premixed gas.

  Furthermore, a screw conveyor or a rotary valve is installed in two stages in series, and an inert gas such as nitrogen is injected between them to increase the internal pressure above the external pressure, thereby leaking gasified gas in the activated carbon adsorption tower and activated carbon. Intrusion of outside air into the adsorption tower can be prevented more reliably.

  Furthermore, in this invention, the buffer tank which stores temporarily the activated carbon cut out from the activated carbon type adsorption tower can be provided between the activated carbon type adsorption tower and the regeneration tower. The degree of decrease in the adsorption capacity (activity) of the activated carbon in the activated carbon adsorption tower varies depending on the gasification gas throughput in the activated carbon adsorption tower, that is, the load of the gasification furnace. For this reason, although it is preferable to adjust the cut-out amount of the activated carbon from the activated carbon adsorption tower according to the load of the gasification furnace, on the other hand, it is preferable to carry out the regeneration treatment of the activated carbon in the regeneration tower as much as possible. Therefore, by providing a buffer tank between the activated carbon adsorption tower and the regeneration tower, it is possible to absorb load fluctuations and keep the activated carbon regeneration conditions constant.

  According to the present invention, the activated carbon in the activated carbon type adsorption tower whose adsorption capacity is reduced by adsorption of the high boiling point hydrocarbon compound in the gasification gas is continuously cut out, and is returned to the activated carbon type adsorption tower again after regeneration. Therefore, the activated carbon can be regenerated at the same time while using the activated carbon adsorption tower for adsorption, and the continuous operation can be performed while maintaining the adsorption capacity only by providing one activated carbon adsorption tower.

  Moreover, since the tar content and light oil content in the gasification gas can be stably removed, an operation with the gasification temperature and the reforming temperature lowered can be performed, and a high calorie gasification gas can be stably obtained. In addition, it is possible to reduce the energy, oxygen amount, and the like necessary for increasing the gas temperature, and it is possible to obtain a high calorie gasified gas at a lower cost.

  Embodiments of the present invention will be described below based on examples shown in the drawings.

  FIG. 1 is an apparatus configuration diagram showing a first embodiment of the present invention.

  In FIG. 1, the activated carbon type adsorption tower 1 is provided with one fluidized bed type activated carbon adsorption layer 1a, and the gasification gas obtained by the gasification furnace 2 which gasifies organic waste is the activated carbon type adsorption tower. 1 is introduced from its lower part, and after passing through the activated carbon adsorption layer 1a, it is discharged from the upper part. In the process, dioxins and high boiling point hydrocarbon compounds in the gasification gas are adsorbed on the activated carbon of the activated carbon adsorption layer 1a.

  A rotary valve 3 is provided at the bottom of the activated carbon adsorption tower 1 as an activated carbon cutting device, and activated carbon is continuously cut out from the bottom of the activated carbon adsorption tower 1 by the rotary valve 3. The cut activated carbon is transported by the activated carbon transport device 4 and continuously charged into the regeneration tower 5 from the top of the regeneration tower 5.

  Activated carbon regeneration steam is introduced into the regeneration tower 5 from the top, and the high boiling point hydrocarbon compound adsorbed on the activated carbon by this steam is vaporized and discharged to the steam side as waste steam. The activated carbon is regenerated. On the other hand, the waste steam containing the high boiling point hydrocarbon compound or the waste drain condensed with the waste steam is discharged from the lower part of the regeneration tower 5.

  The regenerated activated carbon is continuously discharged from the bottom of the regeneration tower 5, transported by the activated carbon transport device 6, and returned to the activated carbon adsorption tower 1 from the top of the activated carbon adsorption tower 1. In the embodiment, a rotary valve 7 is provided as an activated carbon charging device at the tip of the activated carbon conveyance device 6, and the activated carbon is returned to the activated carbon adsorption tower 1 by the rotary valve 7.

  As described above, in this embodiment, the activated carbon in the activated carbon adsorption tower 1 is continuously cut out and returned to the activated carbon adsorption tower 1 again after regeneration, so that the activated carbon adsorption tower 1 is used for adsorption. At the same time, the activated carbon can be regenerated, and only by providing one activated carbon adsorption tower 1, continuous operation can be performed while maintaining the adsorption capacity.

  In this embodiment, since the activated carbon adsorption layer 1a of the activated carbon adsorption tower 1 is a fluidized bed, the entire activated carbon adsorption layer 1a is uniform, and the flow of gasification gas in the activated carbon adsorption layer 1a is also uniform. It is easy to obtain gasified gas with stable properties.

  In addition, since the regeneration tower 5 is a moving bed that continuously regenerates the activated carbon, the activated carbon can be efficiently regenerated and the steam consumption greatly fluctuates at the time of regeneration switching as in the batch type. Therefore, it does not affect the load of other equipment that uses steam, such as a steam turbine.

  FIG. 2 is an apparatus configuration diagram showing a second embodiment of the present invention. In this embodiment, the activated carbon adsorption tower 1 is provided with three fluidized bed type activated carbon adsorption layers 1a to 1c, and these activated carbon adsorption layers 1a to 1c are provided in series in the flow direction of the gasification gas. Yes.

  In the present embodiment, since the activated carbon adsorption layers 1a to 1c are used as moving layers, the activated carbon moves downward while adsorbing high-boiling hydrocarbon compounds and the like in the activated carbon adsorption layers 1a to 1c. Therefore, activated carbon that has sufficiently adsorbed high-boiling hydrocarbon compounds and the like is discharged from the bottom of the activated carbon-type adsorption tower 1 and sent to the regeneration tower 5, so that the capacity of the activated carbon can be fully exploited. Can be kept low.

  FIG. 3 is an apparatus configuration diagram showing a third embodiment of the present invention. This example is a modification of the previous second example, and the activated carbon cut out from the activated carbon adsorption layer 1a on the upstream side is conveyed by the first activated carbon conveying device 4a and regenerated by the first regeneration tower 5a, Activated carbon cut from the activated carbon adsorption layers 1b and 1c on the downstream side is conveyed by the second activated carbon conveying device 4b and regenerated by the second regeneration tower 5b, and the activated carbon regenerated by the first regeneration tower 5a is the first activated carbon. The activated carbon transfer device 6a returns the activated carbon adsorption layer 1a to the upstream side again, and the activated carbon regenerated by the second regeneration tower 5b is returned to the downstream activated carbon adsorption layers 1b and 1c by the second activated carbon transfer device 6b. Is.

  As described above, since the gasification gas contains a large amount of high-boiling hydrocarbon compounds having various molecular weights, the activated carbon adsorption layers 1a to 1c are provided in series in the flow direction of the gasification gas. When gasified gas is passed through, the activated carbon adsorption layer 1a on the upstream side adsorbs more high-boiling hydrocarbon compounds and selectively adsorbs high-boiling hydrocarbon compounds (tar content) having a large molecular weight. On the other hand, the remaining high-boiling hydrocarbon compounds (light oil components) having a small molecular weight are adsorbed on the activated carbon adsorption layers 1b and 1c on the downstream side. Therefore, the activated carbon of the activated carbon adsorption layer 1a on the upstream side and the activated carbon of the activated carbon adsorption layers 1b and 1c on the downstream side are cut out separately, and the regeneration process is performed in the separate regeneration towers 5a and 5b. In accordance with each, appropriate reproduction processing can be performed.

  For example, since the activated carbon of the activated carbon adsorption layer 1a on the upstream side has a large amount of high-boiling hydrocarbon compounds and a large amount of tar that is difficult to desorb from the activated carbon, the activated carbon of the activated carbon adsorption layer 1a is regenerated. It is possible to take measures such that the temperature of the steam used in the regeneration tower 5a is higher than the temperature of the steam used in the second regeneration tower 5b. Similarly, the cutting speed of activated carbon from the activated carbon adsorption layer 1a and the activated carbon adsorption layer 1a can be increased. The activated carbon adsorption layer 1a on the upstream side uses activated carbon with large pores suitable for adsorption of tar, and the activated carbon adsorption layers 1b and 1c on the downstream side use activated carbon with small pores suitable for adsorption of light oil. You can also

  FIG. 4 is an apparatus configuration diagram showing a fourth embodiment of the present invention. In this embodiment, the screw conveyor 8 is used instead of the rotary valve as the activated carbon cutting device in the apparatus configuration of the second embodiment shown in FIG.

  Thus, by using a screw conveyor or a rotary valve as a cutting device for activated carbon from the activated carbon adsorption tower 1, the gasification gas in the activated carbon adsorption tower 1 is sealed with activated carbon, and the activated carbon adsorption tower 1 The gasification gas can be prevented from flowing out of the system, and the oxygen on the outside air can be prevented from entering the activated carbon adsorption tower and generating an explosive premixed gas.

  Furthermore, as shown in FIG. 5, a rotary valve 3 is installed in two stages in series as an apparatus for cutting activated carbon from the activated carbon adsorption tower 1, and an inert gas such as nitrogen is injected between them to make the internal pressure higher than the external pressure. By raising, it is possible to prevent the leakage of gasified gas in the activated carbon type adsorption tower 1 and the intrusion of outside air into the activated carbon type adsorption tower 1 more reliably.

  FIG. 6 is an apparatus configuration diagram showing a fifth embodiment of the present invention. This embodiment is a buffer for temporarily storing activated carbon cut out from the activated carbon adsorption tower 1 between the activated carbon adsorption tower 1 and the regeneration tower 5 in the apparatus configuration of the fourth embodiment shown in FIG. A tank 9 is provided.

  Thus, by providing the buffer tank 9, the amount and properties of the gasification gas passing through the activated carbon type adsorption tower 1 change with the load fluctuation of the gasification furnace 2. Even if the cut-out amount of the activated carbon from 1 is changed, the load fluctuation is absorbed, and the regeneration condition of the activated carbon in the regeneration tower 5 can be kept constant. In this embodiment, the rotary valve 10 is used to cut the activated carbon from the buffer tank 9 and put it into the regeneration tower 5.

BRIEF DESCRIPTION OF THE DRAWINGS It is an apparatus block diagram which shows 1st Example of this invention. It is an apparatus block diagram which shows 2nd Example of this invention. It is an apparatus block diagram which shows 3rd Example of this invention. It is an apparatus block diagram which shows 4th Example of this invention. The preferable structural example of the cutting-out apparatus which cuts out activated carbon from an activated carbon type adsorption tower is shown. It is an apparatus block diagram which shows 5th Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Activated carbon type adsorption tower 1a-1c Activated carbon adsorption layer 2 Gasification furnace 3 Rotary valve 4 Activated carbon conveying apparatus 4a 1st activated carbon conveying apparatus 4b 2nd activated carbon conveying apparatus 5 Regeneration tower 5a 1st regeneration tower 5b 2nd reproduction | regeneration Tower 6 Activated carbon conveying device 6a First activated carbon conveying device 6b Second activated carbon conveying device 7 Rotary valve 8 Screw conveyor 9 Buffer tank 10 Rotary valve

Claims (9)

  Gasification gas obtained by pyrolyzing organic waste or solid organic matter such as coal is passed through an activated carbon adsorption tower, and dioxin in the gasification gas and high-boiling carbonization that is liquid or solid at normal temperature and pressure. In the gasification gas purification method for adsorbing hydrogen compounds, the activated carbon adsorption tower is used as a moving bed or fluidized bed, activated carbon is continuously cut out from the activated carbon adsorption tower, and the cut activated carbon is regenerated in a regeneration tower separately installed. A method for purifying gasification gas, which is then returned to the activated carbon adsorption tower.   The method for purifying a gasification gas according to claim 1, wherein the regeneration tower is a moving bed or a fluidized bed.   The method for purifying a gasification gas according to claim 1 or 2, wherein steam is used for regeneration of the activated carbon in the regeneration tower.   Gasification gas obtained by pyrolyzing organic waste or solid organic matter such as coal is passed through an activated carbon adsorption tower, and dioxin in the gasification gas and high-boiling carbonization that is liquid or solid at normal temperature and pressure. In a purification apparatus for gasified gas that adsorbs hydrogen compounds, the activated carbon adsorption tower is used as a moving bed or fluidized bed, and a cutting device that continuously cuts activated carbon from the activated carbon adsorption tower and the activated carbon cut by this cutting device are regenerated. An apparatus for purifying a gasification gas, comprising: a regeneration tower for regenerating the activated carbon; and an activated carbon transport device for returning the activated carbon regenerated in the regeneration tower to the activated carbon adsorption tower.   The purification apparatus of the gasification gas of Claim 4 which provided the some activated carbon adsorption layer in series in the flow direction of gasification gas in the activated carbon type adsorption tower.   The purification apparatus for gasification gas according to claim 4 or 5, wherein the regeneration tower is a moving bed or a fluidized bed.   The purification apparatus for gasification gas according to any one of claims 4 to 6, wherein the regeneration tower uses steam for regeneration of activated carbon.   The gasification gas purification device according to any one of claims 4 to 7, wherein the cutting device is a screw conveyor or a rotary valve.   The purification apparatus of the gasification gas in any one of Claims 4-8 which provided the buffer tank which temporarily stores the activated carbon cut out from the activated carbon type adsorption tower between the activated carbon type adsorption tower and the regeneration tower.

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