JP2008308536A - Apparatus for purifying gasified gas and method for purifying the gasified gas - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus for purifying a gasified gas, which can make activated carbon to efficiently adsorb dioxin compounds and high boiling point hydrocarbon compounds in the gasified gas and can efficiently release the absorbed high boiling point hydrocarbon compounds, when the activated carbon is reclaimed, and to provide a method for purifying the gasified gas. <P>SOLUTION: This apparatus for purifying the gasified gas, which has an activated carbon type adsorption apparatus 1 equipped with two or more activated carbon adsorption towers 1a, 1b in parallel to adsorb off dioxin compounds and high boiling point hydrocarbon compounds liquid or solid at ordinary temperature and at atmospheric pressure in the gasified gas obtained by thermally cracking organic wastes or solid organic materials, is operated, while switching the two or more activated carbon adsorption towers 1a, 1b are switched, and a reclamation gas at ≥80°C not containing oxygen, such as steam is passed, through the activated carbon adsorption tower not used for the adsorbing-off to release and reclaim the adsorbed substances. The apparatus is characterized by disposing heating means 12 for heating or cooling the activated carbon and/or the inner wall surfaces of the activated carbon adsorption towers 1a, 1b. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

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

  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. .

  Furthermore, in order to stably remove high-boiling hydrocarbon compounds mainly composed of tar and light oil in gasification gas using activated carbon, high-boiling carbonization is periodically performed from activated carbon adsorbed with high-boiling hydrocarbon compounds. It is necessary to recover and regenerate the adsorption capacity of activated carbon by removing hydrogen compounds. This regeneration of the activated carbon is usually performed by passing steam through the activated carbon adsorption tower, but the temperature of the steam is lowered by passing through the activated carbon adsorption tower, and a sufficient regeneration effect may not be obtained. In addition, vapor may condense on the inner wall surface of the activated carbon adsorption tower. When dew condensation occurs, the gasification gas using organic waste as a raw material contains a large amount of HCl, which may corrode the inner wall surface of the activated carbon adsorption tower.

  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 technique, as seen in coke oven gas purification techniques, there is a technique of cleaning a gas with oil at a low temperature to remove a tar 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. Also, dioxins and light oil 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 generally to establish a purification technology for gasification gas using activated carbon.

  Specifically, gasification that allows dioxins and high-boiling point hydrocarbon compounds in gasification gas to be efficiently adsorbed on activated carbon, and that the adsorbed high-boiling point hydrocarbon compounds can be efficiently removed during regeneration of activated carbon. The object is to provide a gas purification device and a purification method.

  The present invention is intended to adsorb and remove dioxins in gasification gas obtained by pyrolyzing organic waste or solid organic matter such as coal and high-boiling hydrocarbon compounds that are liquid or solid at normal temperature and pressure. For activated carbon adsorption towers that have an activated carbon type adsorption device equipped with two or more activated carbon adsorption towers in parallel, operate while switching between the two or more activated carbon adsorption towers, and are not used for adsorption removal, oxygen such as steam In an apparatus for purifying gasified gas that regenerates activated carbon by removing the adsorbed material by passing a regeneration gas at 80 ° C. or higher that does not contain methane, activated carbon of the activated carbon adsorption tower and / or activated carbon of the activated carbon adsorption tower A heat transfer means for heating or cooling is provided.

  Further, the present invention provides a gasification gas purification method using the gasification gas purification apparatus described above, wherein when the activated carbon adsorption tower is used for adsorption removal, the inner wall surface of the activated carbon adsorption tower and / or the heat transfer means is used. The activated carbon of the activated carbon adsorption tower is cooled, or when the activated carbon of the activated carbon adsorption tower is regenerated, the inner wall surface of the activated carbon adsorption tower and / or the activated carbon of the activated carbon adsorption tower is heated by heat transfer means.

  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 hydrocarbon compounds need to be removed in order to effectively use the gasification gas. In the present invention, as described above, the activated carbon-type adsorption comprising two or more activated carbon adsorption towers provided in parallel. The apparatus removes dioxins and high-boiling hydrocarbon compounds contained in combustible gas in the gasification gas of organic waste or solid organic matter.

  That is, the activated carbon packed in the activated carbon adsorption tower has innumerable pores on the surface, and dioxin and polymer hydrocarbon compound molecules enter the pores to be adsorbed and removed from the gasification gas. .

  Of the two or more activated carbon adsorption towers constituting the activated carbon adsorption apparatus, the activated carbon adsorption tower whose adsorption capacity is reduced by adsorption of the high-boiling hydrocarbon compound is shut off from the gasification gas, By passing a gas of 80 ° C. or higher that does not contain oxygen, the high-boiling point hydrocarbon compound adsorbed in the pores of the activated carbon is vaporized and released, the activated carbon is regenerated, and the adsorption capacity can be recovered.

  Thereafter, the gasification gas passing through the activated carbon adsorption tower whose adsorption capacity has been restored is restarted. By repeating this operation and operating while switching the two or more activated carbon adsorption towers, the gas purification capacity of the apparatus can be maintained.

  Furthermore, in the present invention, in order to improve the adsorption efficiency of the high boiling point hydrocarbon compound and the like by the activated carbon of the activated carbon adsorption tower and the separation efficiency of the high boiling point hydrocarbon compound from the activated carbon, the inner wall surface of the activated carbon adsorption tower and / or the activated carbon adsorption A heat transfer means for heating or cooling the activated carbon of the tower is provided.

  That is, when the activated carbon adsorption tower is used for adsorption removal, the inner wall surface of the activated carbon adsorption tower and / or the activated carbon of the activated carbon adsorption tower is cooled by heat transfer means. Thereby, the adsorption efficiency of the high-boiling hydrocarbon compound or the like by the activated carbon of the activated carbon adsorption tower can be improved. In this case, the temperature of the activated carbon is measured during use of the activated carbon adsorption tower, and when the temperature becomes too high (for example, when it becomes 80 ° C. or higher), the inner wall surface of the activated carbon adsorption tower and The activated carbon of the activated carbon adsorption tower can be cooled.

  When the activated carbon of the activated carbon adsorption tower is regenerated, the inner wall surface of the activated carbon adsorption tower and / or the activated carbon of the activated carbon adsorption tower is heated by heat transfer means. Thereby, the separation efficiency of the high boiling point hydrocarbon compound from the activated carbon can be improved, and condensation on the inner wall surface of the activated carbon adsorption tower can be prevented.

  As the heat transfer means, a heat transfer tube through which a heating medium or a cooling medium passes can be installed on the wall surface of the activated carbon adsorption tower and / or inside the activated carbon adsorption tower. Thus, by constituting the heat transfer means from the heat transfer tube, both heating and cooling can be performed only by changing the medium passing through the heat transfer means or its temperature. In order to prevent condensation on the inner wall surface of the activated carbon adsorption tower, it is preferable to install a heat transfer tube on the wall surface of the activated carbon adsorption tower. For heating and cooling the activated carbon of the activated carbon adsorption tower, it is preferable to install a heat transfer tube inside the activated carbon adsorption tower. Most preferably, the heat transfer tubes are installed on both the inner wall surface and the inside of the activated carbon adsorption tower.

Further, in the present invention, the activated carbon is filled in a plurality of pipes arranged in parallel, the inlets and outlets of the pipes are gathered together, and the pipe groups arranged in parallel are stored in a steel tank. During regeneration, a regeneration gas such as steam can be passed through a tube filled with activated carbon, and the outer surface of the tube can be heated with a heating gas such as steam, hot air, or exhaust gas.

  ADVANTAGE OF THE INVENTION According to this invention, while being able to improve the adsorption efficiency of the high boiling point hydrocarbon compound etc. by the activated carbon of an activated carbon adsorption tower, and the separation | elimination efficiency of the high boiling point hydrocarbon compound from activated carbon, dew condensation on the inner wall surface of an activated carbon adsorption tower Can be prevented. Therefore, it is possible to improve the operation efficiency of the apparatus and stabilize the operation.

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

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

  In FIG. 1, the activated carbon adsorption device 1 is composed of two activated carbon adsorption towers 1a and 1b. The gasification gas obtained in the gasification furnace 2 for gasifying organic waste passes through the gasification gas supply main 3, and then gasification gas supply branches 3a and 3b leading to the activated carbon adsorption towers 1a and 1b, respectively. And is introduced into the activated carbon adsorption towers 1a and 1b from below.

  When the gasification gas is introduced into the activated carbon adsorption towers 1a and 1b, dioxins and high-boiling hydrocarbon compounds in the gasification gas are adsorbed by the activated carbon in the activated carbon adsorption towers 1a and 1b, and then the gasification gas is activated carbon. The gas is discharged from the gasification gas discharge branch pipes 4 a and 4 b connected to the upper portions of the adsorption towers 1 a and 1 b, joins the gasification gas discharge main pipe 4, and is conveyed to the gas utilization facility 5. Specific uses of gasified gas include fuel for industrial furnaces such as heating furnaces and coke ovens, fuel for gas engines and gas turbines, boiler fuel, fuel for hot stove furnaces, and the like.

  The gasification gas supply branch pipes 3a and 3b and the gasification gas discharge branch pipes 4a and 4b are provided with on-off valves 3c and 3d and on-off valves 4c and 4d, respectively. Further, each of the activated carbon adsorption towers 1a and 1b is connected to the steam supply branch pipes 6a and 6b branched from the steam supply main pipe 6 at the upper part and to the waste steam discharge branch pipes 7a and 7b at the lower part. The steam supply branch pipes 6a and 6b and the waste steam discharge branch pipes 7a and 7b are provided with on-off valves 6c and 6d and on-off valves 7c and 7d, respectively.

  As the gasification furnace 2, various furnaces such as a shaft furnace, a rotary kiln furnace, a fluidized bed furnace, a fixed bed furnace, and a jet flow furnace can be used. Further, as the heating method of the gasification furnace 2, either a partial combustion method in which the generated gasification gas is partially burned to be a heat source or an external heat method using an external heat source may be used. The external heat system by 2a is adopted.

  The activated carbon adsorption towers 1a and 1b are provided with heat transfer tubes 12 as heat transfer means for heating or cooling the inner wall surfaces of the activated carbon adsorption towers 1a and 1b and the activated carbon of the activated carbon adsorption towers 1a and 1b.

  2A and 2B show a configuration example of a heat transfer means using the heat transfer tube 12, in which FIG. 2A is a cross-sectional view, and FIG. In this example, the heat transfer tubes 12 are welded to each other through an iron skin 13 and joined together to form the wall surfaces of the activated carbon adsorption towers 1a and 1b with a so-called membrane, thereby connecting the heat transfer tubes 12 to the activated carbon adsorption towers 1a and 1b. The heat transfer tube 12 is installed on the wall surface.

  FIGS. 3A and 3B show another configuration example of the heat transfer means using the heat transfer tube 12, in which FIG. 3A is a transverse sectional view, and FIG. 3B is a longitudinal sectional view. In this example, the heat transfer tubes 12 are installed radially inside the activated carbon adsorption towers 1a and 1b.

  In such a configuration, by passing the heating medium or the cooling medium through the heat transfer tube 12, the inner wall surfaces of the activated carbon adsorption towers 1a and 1b and the activated carbon of the activated carbon adsorption towers 1a and 1b can be heated or cooled. Steam can be used as the heating medium. In this case, as shown in FIG. 4 (a), the heat transfer pipe 12 and the steam supply branch pipes 6a and 6b are connected in series, and the steam flows from the heat transfer pipe 12 to the steam supply branch pipes 6a and 6b. After passing through, it can be discharged from the waste steam discharge branch pipes 7a, 7b. As a result, the amount of steam used can be reduced.

  Moreover, as shown in FIG.4 (b), the heat exchanger tube 12 and the steam supply branch pipes 6a and 6b can also be made into a parallel, ie, another system. When the heat transfer tube 12 is provided in a separate system in this way, a heating medium other than steam can flow through the heat transfer tube 12 and a cooling medium such as cooling water can also flow, so that the heat transfer tube 12 as a heat transfer means. The function of can be fully exhibited.

  In FIG. 5, the preferable structural example of the on-off valve installed in the gasification gas supply branch pipes 3a and 3b and the gasification gas discharge branch pipes 4a and 4b is shown. The on-off valve 14 shown in the figure opens and closes the pipe line by operating the handle 14a and moving the valve body 14c via the shaft 14b. In addition, a gland packing 14d is mounted in a state of being pressed by a gland press 14e for gas sealing of the shaft 14b portion serving as a drive unit. Further, in order to reliably prevent the gasification gas from leaking from the shaft 14b portion, an inert gas such as nitrogen is pressed into the shaft 14b portion.

  The valve body 14c may be moved via the shaft 14b by a gear or a cylinder instead of the handle 14a. Moreover, in order to prevent the gasification gas from leaking from the opening / closing valve portions installed in the gasification gas supply branch pipes 3a, 3b and the gasification gas discharge branch pipes 4a, 4b, the opening / closing valves can be provided in two stages. In this case, the open / close valve on the side close to the activated carbon adsorption tower is preferably a gate valve or butterfly valve using a metal sheet, and the open / close valve on the side far from the activated carbon adsorption tower is preferably a butterfly valve using a fluororesin sheet. . By using a metal sheet with high heat resistance on the side close to the activated carbon adsorption tower that becomes high temperature in this way, and using a fluororesin sheet with high gas barrier properties on the side far from the activated carbon adsorption tower, both heat resistance and barrier properties are achieved. Can be satisfied. Further, by injecting an inert gas at room temperature such as nitrogen between the two-stage on-off valves, the gas barrier properties and heat resistance can be further improved.

  In the above configuration, at the start of operation, gasification gas is passed through both activated carbon adsorption towers 1a and 1b. By passing the cooling medium through the heat transfer tube 12 described above, the activated carbon of the activated carbon adsorption towers 1a and 1b can be cooled and the adsorption efficiency can be improved. In this case, the temperature of the activated carbon is measured during use of the activated carbon adsorption towers 1a and 1b, and when the temperature becomes too high (for example, 80 ° C. or higher), a cooling medium is passed through the heat transfer tube 12. The activated carbon of the activated carbon adsorption tower can be cooled.

  After that, when the adsorption capacity of one of the activated carbon adsorption towers decreases, or when a predetermined time elapses after the gasification gas passes, the gasification gas passes through one of the activated carbon adsorption towers where the adsorption capacity decreases. Shut off.

  For example, when shutting off gas flow to the activated carbon adsorption tower 1a, the on-off valve 3c of the gasification gas supply branch 3a and the on-off valve 4c of the gasification gas discharge branch 4a are closed. Then, the on-off valve 6c of the steam supply branch 6a and the on-off valve 7c of the waste steam discharge branch 7a are opened, and steam is passed through the activated carbon adsorption tower 1a to regenerate the activated carbon to restore the adsorption capacity. When the adsorption capacity is restored, the on-off valve 6c of the steam supply branch 6a and the on-off valve 7c of the waste steam discharge branch 7a are closed, and the on-off valve 3c of the gasification gas supply branch 3a and the on-off valve of the gasification gas discharge branch 4a 4c is opened and gasification gas passage is resumed.

  After that, when the adsorption capacity of the other activated carbon adsorption tower 1b is reduced, the gasification gas is shut off and then the adsorption capacity is recovered through steam, as in the case of the activated carbon adsorption tower 1a. Restart the gas flow. In this embodiment, by repeating such an operation, it is possible to continuously purify the gasification gas while maintaining the adsorption capacity.

  When the activated carbon of the activated carbon adsorption tower is regenerated, the heating medium is passed through the heat transfer tube 12 described above to heat the inner wall surfaces of the activated carbon adsorption towers 1a and 1b and the activated carbon. Thereby, the separation efficiency of the high boiling point hydrocarbon compound from the activated carbon can be improved, and corrosion due to condensation on the inner wall surfaces of the activated carbon adsorption towers 1a and 1b can be prevented.

  In order to further improve the corrosion resistance of the inner wall surfaces of the activated carbon adsorption towers 1a and 1b, the inner wall surfaces of the activated carbon adsorption towers 1a and 1b may be coated with a resin. In the case of resin coating, the temperature of steam used for regeneration of activated carbon is 150 ° C. or less. However, in order to maintain the regeneration capability, 60 ° C. or higher, preferably 80 ° C. or higher is required. When the steam to be used is high in temperature, the resin may be altered by heat. In that case, the alteration can be suppressed by keeping the wall temperature of the activated carbon adsorption towers 1a and 1b constant with warm water or the like.

  In addition, when the activated carbon in the activated carbon adsorption tower is regenerated, the high-boiling hydrocarbon compound adsorbed on the activated carbon is vaporized and removed by the passing gas of the vapor separated from the activated carbon and recovered as waste steam. The waste steam containing the high boiling point hydrocarbon compound or the waste drain condensed with the waste steam is once put into the separation device 8 through the waste steam discharge main pipe 7, and the waste steam is condensed by cooling or the like. Hydrogen compounds are separated from moisture. The high-boiling point hydrocarbon compound separated and recovered by the separation device 8 is temporarily stored in the storage tank 9 in a liquid state, and then transferred through the blowing pipe 10, and gas is discharged from the blowing device 11 at the tip thereof. It is blown into the conversion furnace 2 or the combustion furnace 2a as a heat source.

  In addition, in FIG. 1, although the blowing apparatus 11 is described in both the gasification furnace 2 or the combustion furnace 2a, it is actually only one of them.

  Here, as the operating conditions of the gasification gas purification apparatus shown in FIG. 1, the gas temperature of the gasification gas introduced into the activated carbon adsorption towers 1a and 1b is preferably set to 100 ° C. or less. If the gas temperature exceeds 100 ° C., the vapor pressure of the high-boiling hydrocarbon compound in the gasification gas becomes high, the volatility becomes higher than the adsorption power by the activated carbon, and sufficient adsorption capacity cannot be secured. The gas temperature is preferably 60 ° C. or lower. However, if the gas temperature is set to 20 ° C. or less, for example, the temperature of the cooling water necessary for cooling the gasification gas cannot be obtained by general equipment such as a cooling tower, and a refrigerator is required. Use of a refrigerator is not preferable because it imposes a heavy burden on equipment costs and running costs. Moreover, generally the temperature of the vapor | steam introduce | transduced for the adsorption capacity recovery | restoration of an activated carbon adsorption tower shall be 80-300 degreeC.

  In the above embodiment, the heat transfer means is constituted by a heat transfer tube, but the activated carbon packed tower may have a jacket structure as the heat transfer means, and the heating medium or the cooling medium may be passed therethrough.

  FIG. 6 is a partially broken perspective view showing another example of the activated carbon adsorption tower that can be used in the present invention. In the activated carbon adsorption towers 1a and 1b shown in the figure, the activated carbon a is filled in a plurality of tubes 15 (about 30 to 300 mm) arranged in parallel, and the plurality of tubes 15 (tube group) are made of steel. In the tank 16. The inlets of the tubes 15 are gathered at the lower part of the tank 16, and the outlets are gathered at the upper part of the tank 16. Further, a gasified gas inlet 16 a is provided at the lower part of the tank 16, and a gasified gas outlet 16 b is provided at the upper part of the tank 16. Further, a regeneration gas introduction port 16 c for introducing a regeneration gas such as steam is provided in the upper part of the tank 16, and a regeneration gas discharge port 16 d is provided in the lower part of the tank 16. Furthermore, a heating gas introduction port 16e for introducing a heating gas is provided at one end of the central portion of the side surface of the tank 16, and a heating gas discharge port 16f is provided at the other end.

  In the above configuration, when the dioxins and high-boiling hydrocarbon compounds in the gasification gas are adsorbed and removed by the activated carbon adsorption towers 1a and 1b, the gasification gas is introduced into the lower portion of the tank 16 from the gasification gas inlet 16a. To do. The gasified gas introduced into the lower part of the tank 16 passes through each pipe 15 and is discharged from the gasified gas discharge port 16 b at the upper part of the tank 16. As a result, dioxins and high-boiling hydrocarbon compounds in the gasification gas are adsorbed and removed by the activated carbon a in each pipe 15.

  On the other hand, in order to regenerate the activated carbon a of the activated carbon adsorption towers 1a and 1b, after stopping the gasification gas flow, a regeneration gas such as steam is introduced from the regeneration gas inlet 16c at the top of the tank 16, The regeneration gas is passed through each pipe 15 and discharged from a regeneration gas discharge port 16d at the bottom of the tank 16. Further, when the activated carbon a is regenerated, a heating gas is introduced from the heating gas inlet 16e, and the outer surface of each pipe 15 is heated by the heating gas. Thereafter, the heating gas is discharged from the heating gas discharge port 16f. As the heating gas, hot air from a burner or the like, hot exhaust gas from the combustion furnace 2a in FIG.

  Thus, in the example of FIG. 6, when the activated carbon is regenerated, in addition to passing the regeneration gas (steam) through each tube 15, each tube 15 is heated with the heating gas. The activated carbon can be efficiently regenerated. Moreover, the temperature of activated carbon tends to rise, and the overall thermal efficiency becomes high. Furthermore, effective use of heat is possible by using the exhaust gas from the combustion furnace 2a of FIG. 1 as a heating gas.

  In addition, the activated carbon adsorption towers 1a and 1b shown in FIG. 6 are also arranged in parallel in the same manner as in the example of FIG. 1, or two or more activated carbon adsorption towers are operated for switching and used for adsorption removal. Needless to say, the activated carbon adsorbing tower can be regenerated as described above.

It is an apparatus block diagram which shows one Example of this invention. The structural example of the heat-transfer means by a heat exchanger tube used in FIG. 1 is shown, (a) is a cross-sectional view, (b) is a perspective view of the principal part. The other structural example of the heat-transfer means by a heat exchanger tube used in FIG. 1 is shown, (a) is a cross-sectional view, (b) is a longitudinal cross-sectional view. The structural example for supplying a heating medium or a cooling medium to the heat exchanger tube as a heat-transfer means used in FIG. 1 is shown. The preferable structural example of the on-off valve used in FIG. 1 is shown. It is a partially broken perspective view which shows the other example of the activated carbon adsorption tower which can be used in this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Activated carbon type adsorption apparatus 1a, 1b Activated carbon adsorption tower 2 Gasification furnace 3 Gasification gas supply main 3a, 3b Gasification gas supply branch 3c, 3d On-off valve 4 Gasification gas discharge main 4a, 4b Gasification gas discharge branch 4c, 4d Open / close valve 5 Gas utilization facility 6 Steam supply main pipe 6a, 6b Steam supply branch pipe 6c, 6d Open / close valve 7 Waste steam discharge main pipe 7a, 7b Waste steam discharge branch pipe 7c, 7d Open / close valve 8 Separator 9 Storage tank 10 Blowing piping 11 Blowing device 12 Heat transfer pipe 13 Iron skin 14 On-off valve 14a Handle 14b Shaft 14c Valve body 14d Gland packing 14e Ground press 15 Pipe 16 Tank 16a Gasification gas inlet 16b Gasification gas outlet 16c Regeneration gas inlet 16d Gas outlet for regeneration 16e Gas inlet for heating 16f Gas outlet for heating

Claims (5)

Two or more dioxins in the gasification gas obtained by pyrolyzing organic waste or solid organic matter such as coal and two or more high-boiling hydrocarbon compounds that are liquid or solid at normal temperature and pressure are adsorbed and removed. An activated carbon adsorption tower having an activated carbon adsorption tower in parallel, which is operated while switching between the two or more activated carbon adsorption towers and is not used for adsorption removal, does not contain oxygen such as steam. In the gasification gas purification device that regenerates the activated carbon by separating the adsorbed substances by passing the regeneration gas above ℃,
An apparatus for purifying gasification gas, comprising a heat transfer means for heating or cooling the inner wall surface of the activated carbon adsorption tower and / or the activated carbon of the activated carbon adsorption tower.   The purification apparatus of the gasification gas of Claim 1 which installed the heat exchanger tube which lets a heating medium or a cooling medium pass as a heat-transfer means in the wall surface of an activated carbon adsorption tower, and / or the inside of an activated carbon adsorption tower. A gasification gas that adsorbs and removes dioxins in gasification gas obtained by pyrolyzing organic waste or solid organic matter such as coal and high-boiling hydrocarbon compounds that are liquid or solid at normal temperature and pressure with activated carbon. In the purification device,
Activated carbon is filled in a plurality of parallel pipes, the inlets and outlets of the pipes are gathered together, and the pipes arranged in parallel are stored in a steel tank.
A gasification gas characterized by passing a regeneration gas such as steam through a tube filled with activated carbon during regeneration of the activated carbon, and further heating the outer surface of the tube with a heating gas such as steam, hot air or exhaust gas. Purification equipment. In the purification method of the gasification gas by the purification apparatus of the gasification gas of Claim 1 or 2,
A method for purifying a gasification gas, wherein when the activated carbon adsorption tower is used for adsorption removal, the inner wall surface of the activated carbon adsorption tower and / or the activated carbon of the activated carbon adsorption tower is cooled by heat transfer means. In the purification method of the gasification gas by the purification apparatus of the gasification gas of Claim 1 or 2,
A method for purifying gasification gas, comprising heating the activated carbon of the activated carbon adsorption tower and / or activated carbon of the activated carbon adsorption tower by heat transfer means during regeneration of the activated carbon of the activated carbon adsorption tower.

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