JP4559919B2 - Gas reforming apparatus and gas reforming method - Google Patents

Description

  The present invention relates to a gas reforming apparatus and a gas reforming method for reforming a pyrolysis gas generated by pyrolyzing a pyrolyzate such as biomass.

  In recent years, gasification power generation systems that heat and gasify biomass (thermally decomposed materials) such as wood chips and generate electricity using the generated gas as fuel gas have come into practical use. In such a gasification power generation system, when a raw material biomass is heated to about 500 to 600 ° C. under low oxygen and pyrolyzed in a gas generating furnace, a pyrolysis gas mainly composed of carbon monoxide, hydrogen and hydrocarbons. Will occur. The pyrolysis gas is used as fuel gas by supplying it to various power generation facilities such as gas turbine power generation, gas engine power generation, or fuel cell.

  By the way, in the gasification power generation system, the hydrocarbon in the pyrolysis gas produced from biomass is mainly composed of lower hydrocarbons such as methane and ethane, but benzene having 6 or more carbon atoms in the molecule. And higher hydrocarbons such as naphthalene. Higher hydrocarbons exist in a gaseous state at a high temperature of about 500 ° C. or higher. However, the higher hydrocarbons precipitate when the temperature decreases, and become a liquid substance called tar.

  Usually, in gas engine power generation, fuel cells, and the like, it is assumed that fuel gas is used at room temperature, and it is necessary to lower the pyrolysis gas generated as fuel gas to room temperature. At this time, the tar content in the pyrolysis gas is deposited and clogged by adhering to the piping, etc., or in the case of gas engine power generation, the tar content adheres to the spark plug, resulting in poor ignition, etc. There was a problem.

Therefore, conventionally, a gasifier that thermally decomposes (reforms) a tar content in a pyrolysis gas into lower hydrocarbons, carbon monoxide, or hydrogen by adding oxygen (modifier) in a gas reforming furnace. Has been proposed (Patent Document 1).
JP 2004-51745 A

  However, in the gasification apparatus described in Patent Document 1, when the tar content in the pyrolysis gas is pyrolyzed by adding oxygen, the temperature in the gas reforming furnace needs to be set to a high temperature of 1000 ° C. to 1200 ° C. There is. For this reason, there is a problem that not only the gas reforming furnace is easily deteriorated by the high-temperature heat, but also more energy is required to obtain the high-temperature heat, and the energy efficiency is lowered. Furthermore, since the pyrolysis gas expands greatly at high temperatures, the volume of the gas reforming furnace has to be increased.

  The present invention has been made paying attention to such problems. An object of the present invention is to provide a gas reforming apparatus and a gas reforming method capable of reforming a pyrolysis gas obtained by thermal decomposition of a pyrolyzate at a low temperature.

In order to achieve the above object, the invention according to claim 1 includes a gas reforming furnace for reforming a pyrolysis gas obtained by pyrolysis of a pyrolyzate, and the gas reforming furnace includes: A reformer supply pipe for supplying a reformer for reforming the pyrolysis gas into the gas reforming furnace is connected, and the reforming function of the reformer in the gas reforming furnace is improved. The gist is that the catalyst is disposed in the gas reforming furnace .

According to the above configuration, since the reforming function of the reforming agent is improved by the catalyst, the pyrolysis gas in the gas reforming furnace can be reformed at a lower temperature than before.
The invention according to claim 2 is the invention according to claim 1, wherein a catalyst protection member for protecting the catalyst from the pyrolysis gas is provided in the gas reforming furnace , and summarized in that the pyrolysis gas which has flowed from the upstream side in the flow direction of the pyrolysis gases is provided to regulate that the contact with the catalyst before SL gas reforming furnace.

According to the above configuration, since the catalyst does not directly contact the pyrolysis gas, it is possible to prevent the catalyst from being affected by the pyrolysis gas and losing its activity.
According to a third aspect of the present invention, in the first or second aspect of the present invention, the front end of the reformer supply pipe is inserted into the gas reforming furnace, and the catalyst is placed in the front end. And the modifier is pressurized and supplied into the gas reforming furnace through the modifier supply pipe.

  According to the above configuration, the catalyst can surely improve the reforming function of the modifier, and the pressure in the gas reforming furnace and the resistance in the modifier supply pipe by the catalyst can be reduced. In contrast, the modifier can be smoothly supplied into the gas reforming furnace.

  According to a fourth aspect of the present invention, in the third aspect of the present invention, the tip of the modifier supply pipe in the gas reforming furnace opens toward the downstream side in the flow direction of the pyrolysis gas. It is a summary.

  According to the above configuration, the catalyst is prevented from coming into direct contact with the pyrolysis gas by the modifier supply pipe, so that the catalyst is affected by the pyrolysis gas without increasing the number of parts and the activity is increased. It is possible to suppress the loss.

  The invention according to claim 5 is a gas reforming method for reforming a pyrolysis gas obtained by thermal decomposition of a pyrolyzate with a modifier, and a catalyst is used when reforming the pyrolysis gas. The gist is to improve the reforming function of the reforming agent, and then mix the reforming agent with the improved reforming function with the pyrolysis gas.

  According to the above configuration, since the reforming function of the reforming agent is improved by the catalyst, the pyrolysis gas in the gas reforming furnace can be reformed at a lower temperature than before.

  ADVANTAGE OF THE INVENTION According to this invention, the gas reforming apparatus and gas reforming method which can modify | reform the pyrolysis gas obtained by thermal decomposition of a to-be-decomposed material at low temperature can be provided.

(First embodiment)
DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment in which the present invention is embodied in a gas reformer provided in a gasification power generation system will be described with reference to the drawings.

  As shown in FIG. 1, the gasification power generation system 10 includes a gas generation furnace 11, a gas reforming furnace 12, a gas cleaning machine 13, a gas engine 14, and a generator 15. The gas generating furnace 11 and the gas reforming furnace 12 are connected via a first gas pipe 16, and the gas reforming furnace 12 and the gas washer 13 are connected via a second gas pipe 17, and the gas The cleaning machine 13 and the gas engine 14 are connected via a third gas pipe 18. One end of a fourth gas pipe 19 is connected to an intermediate portion of the second gas pipe 17, and the other end of the fourth gas pipe 19 is connected to a gas combustor 20.

  The gas generating furnace 11 is provided with a hopper 11a, and biomass is supplied into the gas generating furnace 11 by introducing biomass as a thermally decomposed material into the hopper 11a. “Biomass” means organic resources derived from renewable organisms, excluding fossil resources. Specifically, thinned wood, timber edge, sewage sludge, pulp sludge, garbage, Examples include human waste, livestock excrement, and agricultural waste. The gas generating furnace 11 is heated so that the internal temperature is about 500 ° C. to 600 ° C., and the biomass in the gas generating furnace 11 is pyrolyzed to combustible pyrolysis gas. Is supposed to be generated.

  The gas reforming furnace 12 is for reforming the pyrolysis gas, and is heated so that the internal temperature becomes about 800 ° C. “Reforming” refers to converting the pyrolysis gas into a desired fuel gas (in this embodiment, a fuel gas suitable for driving the gas engine 14) (decomposing and removing tar in the pyrolysis gas). Means).

  One end of a first supply pipe 21 as a modifier supply pipe is connected to the gas reforming furnace 12, and the other end of the first supply pipe 21 is a first tank 22 in which a first modifier is stored. It is connected to the. A first pump 23 is provided at an intermediate portion of the first supply pipe 21, and the first modifier is supplied to the gas reformer via the first supply pipe 21 by driving the first pump 23. Pressure is supplied into the furnace 12.

  Furthermore, one end of a second supply pipe 24 as a modifier supply pipe is connected to the gas reforming furnace 12, and the other end of the second supply pipe 24 is a second in which a second modifier is stored. It is connected to the tank 25. A second pump 26 is provided in an intermediate portion of the second supply pipe 24, and the second modifier is supplied to the gas reformer via the second supply pipe 24 by driving the second pump 26. Pressure is supplied into the furnace 12. In the present embodiment, the first supply pipe 21, the first tank 22, the first pump 23, the second supply pipe 24, the second tank 25, and the second pump 26 constitute a modifier supply means. The reformer supply means and the gas reforming furnace 12 constitute a gas reforming device 27.

  As shown in FIG. 2, the first supply pipe 21 and the second supply pipe 24 are inserted into the gas reforming furnace 12 from the horizontal direction (left and right direction in FIG. 2), and the gas reforming is performed. In the quality furnace 12, it is bent in an elbow shape vertically downward. A first injection port 21a and a second injection port that open toward the downstream side in the flow direction of the pyrolysis gas at the tips of the first supply pipe 21 and the second supply pipe 24 in the gas reforming furnace 12. 24a is provided, and both the injection ports 21a and 24a are arranged such that the first injection port 21a is positioned upstream of the second injection port 24a in the flow direction of the pyrolysis gas. The first modifier and the second modifier are respectively injected into the gas reforming furnace 12 from the first injection port 21a and the second injection port 24a so as to form a mist. It has become.

  As the first modifier, at least one of water and oxygen (air) can be used. In this embodiment, only water is used. As the second modifier, a compound having at least a hydroxyl group (hydroxyl group) in the molecule is used, and methyl alcohol is used in the present embodiment. As the compound having a hydroxyl group used for the second modifier, in addition to methyl alcohol, a monovalent alcohol such as ethyl alcohol or propyl alcohol, a divalent alcohol such as ethylene glycol, or a trivalent such as glycerin. Examples include alcohol. In addition to these compounds, examples of the compound include monovalent carboxylic acids such as formic acid and acetic acid, divalent carboxylic acids such as oxalic acid, alkali metal hydroxides such as potassium hydroxide and sodium hydroxide, and hydroxides. Examples thereof include hydroxides of alkaline earth metals such as magnesium and calcium hydroxide.

  As shown in FIG. 1, the gas combustor 20 burns a part of the pyrolysis gas (hereinafter referred to as “reformed gas”) reformed in the gas reforming furnace 12. The heat generated by this combustion is used to heat the gas reforming furnace 12 and to vaporize water as the first modifier. Therefore, the water as the first modifier is the gas from the first injection port 21a in the state of high-temperature steam vaporized by the heat supplied from the gas combustor 20 into the first supply pipe 21. It is sprayed into the reforming furnace 12.

  The gas washer 13 is sprayed with cold water inside, and cleans and cools the reformed gas. That is, in the gas washer 13, the ash, hydrogen chloride, nitrogen oxides contained in the reformed gas are caused by the sprayed cold water by passing (submitting) in the cold water sprayed with the reformed gas. In addition, impurities such as dust are washed away, and heat is taken away to cool down. The gas engine 14 is driven by using the reformed gas cleaned and cooled by the gas washer 13 as a fuel gas, and the generator 15 is driven by this drive so that power is generated. It has become.

  When biomass is supplied into the gas generating furnace 11, the biomass is pyrolyzed to generate pyrolysis gas (main components are carbon monoxide and hydrogen), and the pyrolysis gas is supplied to the first gas pipe 16. Into the gas reforming furnace 12. The pyrolysis gas that has flowed into the gas reforming furnace 12 reacts with high-temperature steam (first reforming agent) sprayed from the first injection port 21a to be reformed to methane gas or the like. Further, tar (main component is aromatic hydrocarbon such as benzene or naphthalene) contained in the pyrolysis gas is carbon dioxide or water by methanol (second modifier) sprayed from the second injection port 24a. Modified (decomposed). That is, in this case, the methanol (second modifier) is decomposed by the heat in the gas reforming furnace 12 to generate a hydroxy radical having a strong oxidizing action, and the tar is modified by the action of the hydroxy radical. Quality.

  Accordingly, the pyrolysis gas generated in the gas generating furnace 11 is mixed with high-temperature steam (first modifier) and methanol (second modifier; hydroxy radical) in the gas reforming furnace 12 to improve efficiency. It is well modified. A part of the gas reformed in the gas reforming furnace 12 is supplied to the gas combustor 20 through the second gas pipe 17 and the fourth gas pipe 19, and the fuel gas of the gas combustor 20 is supplied. Used as

  All the remaining reformed gas reformed in the gas reforming furnace 12 flows into the gas cleaning machine 13 through the second gas pipe 17, and after being cleaned and cooled, the third gas pipe 18 is used. Is supplied to the gas engine 14 through the generator 15 and is generated by the generator 15.

According to the first embodiment described in detail above, the following effects are exhibited.
(1) In the gas reforming furnace 12, since the hydroxyl radical generated from the second modifier is sprayed on the pyrolysis gas, the tar in the pyrolysis gas is strongly oxidized of the hydroxyl radical. By the action, it can be reformed (removed) at a temperature of about 800 ° C. lower than the conventional one (the conventional high temperature of 1000 ° C. to 1200 ° C.). For this reason, deterioration due to heat of the gas reforming furnace 12 can be suppressed more than before, and thermal energy applied to the gas reforming furnace 12 can be reduced as compared with the conventional one. Furthermore, since the pyrolysis gas can be reformed at a lower temperature than before, the expansion amount of the pyrolysis gas becomes smaller than before, and the volume of the gas reforming furnace 12 can be reduced. That is, the gas reforming furnace 12 can be reduced in size.

  In addition, since the pyrolysis gas can be reformed at a temperature of about 800 ° C., which is lower than the conventional temperature, the amount of methane in the reformed gas increases, and the gas engine 14 uses the reformed gas as a fuel gas. Can be suitably driven. Incidentally, when the pyrolysis gas is reformed at a high temperature of 1000 ° C. to 1200 ° C. as in the prior art, the amount of hydrogen in the reformed gas increases, and the reformed gas containing a large amount of such hydrogen is converted into the gas engine 14. When it is used for this fuel gas, knocking is likely to occur and the gas engine 14 may be damaged.

  (2) In the gas reforming furnace 12, the first injection port 21a is located upstream of the second injection port 24a in the flow direction of the pyrolysis gas. After reacting with the modifier, tar in the pyrolysis gas is decomposed by the second modifier. For this reason, reforming of the pyrolysis gas can be performed efficiently.

  (3) The first modifier and the second modifier can be pressurized and supplied into the gas reforming furnace 12 by the first pump 23 and the second pump 26. For this reason, even if the pressure in the gas reforming furnace 12 increases, the first reforming agent and the second modifying agent can be smoothly supplied into the gas reforming furnace 12.

(Second Embodiment)
Next, a second embodiment of the present invention will be described focusing on differences from the first embodiment.
As shown in FIG. 3, the gas reformer 27 according to the second embodiment includes the second injection port in the tip of the second supply pipe 24 (catalyst protection member) inserted into the gas reforming furnace 12. A honeycomb structure 30 on which a catalyst for improving the reforming function of the second modifier with respect to the pyrolysis gas is provided in the vicinity of 24a. Examples of the catalyst include TiO ₂ , CoO, Co (OH) ₂ , CdO, Cd (OH) ₂ , ZnO, Zn (OH) ₂ , PbO, Pb (OH) ₂ , NiO, Ni (OH) ₂ , InO, In (OH) ₂ , Pt ₈ O ₄ , Pt (OH) ₂ or the like is used.

  The second injection port 24a opens toward the downstream side in the flow direction of the pyrolysis gas, and the pyrolysis gas is directly supplied from the upstream side in the flow direction of the pyrolysis gas by the second supply pipe 24. Therefore, contact with the catalyst (the honeycomb structure 30) is restricted.

  Now, when the second pump 26 is driven, the second modifier flowing through the second supply pipe 24 has the action of heat in the gas reforming furnace 12 when passing through the honeycomb structure 30. It is sprayed from the second injection port 24a while efficiently generating hydroxy radicals which are effectively decomposed by contacting with the catalyst and have a strong oxidizing action. Thereby, the tar contained in the pyrolysis gas flowing in the gas reforming furnace 12 is suitably reformed (decomposed and removed) by the action of the hydroxy radical.

According to the second embodiment described in detail above, the following effects are exhibited in addition to the effects (1) to (3) of the first embodiment.
(4) Since the hydroxyl radical can be efficiently generated from the second modifier by the catalyst, the function of reforming (decomposing and removing) tar in the pyrolysis gas by the second modifier is improved. The tar in the pyrolysis gas in the gas reforming furnace 12 can be reformed (decomposed and removed) at a temperature lower than that in the first embodiment.

  (5) The honeycomb structure 30 on which the catalyst is supported is disposed in the distal end portion of the second supply pipe 24. For this reason, the radical can be efficiently generated from the second modifier by the catalyst, and the pressure in the gas reforming furnace 12 and the honeycomb structure 30 are driven by the second pump 26. The second modifier can be smoothly supplied into the gas reforming furnace 12 against the resistance in the second supply pipe 24.

  (6) Since the catalyst can be prevented from coming into direct contact with the pyrolysis gas by the distal end tube wall of the second supply pipe 24, the honeycomb structure 30 can be added to the honeycomb structure 30 without increasing the number of parts. It can be suppressed that soot in the pyrolysis gas adheres and the activity of the catalyst is lost. For this reason, the replacement frequency of the honeycomb structure 30 on which the catalyst is supported can be reduced.

(Third embodiment)
Next, a third embodiment of the present invention will be described focusing on differences from the first embodiment.
As shown in FIG. 4, the gas reformer 27 according to the third embodiment has an electrode in the vicinity of the second injection port 24 a in the tip of the second supply pipe 24 inserted into the gas reforming furnace 12. A rod 40 is provided. The electrode bar 40 is supported by an insulating member (not shown) so as not to contact the inner surface of the second supply pipe 24 and is electrically connected to the power source 41. The inner surface of the tip of the second supply pipe 24 inserted into the gas reforming furnace 12 is coated with a photocatalyst (TiO ₂ ) 42. When the electrode rod 40 is energized by the power source 41, the electrode rod 40 is discharged to the inner surface (photocatalyst 42) of the distal end portion of the second supply tube 24.

  When the electrode rod 40 is energized, the electrode rod 40 is discharged to the photocatalyst 42. When the second pump 26 is driven in this state, the second modifier flowing through the second supply pipe 24 is effectively decomposed by coming into contact with the photocatalyst 42 when passing through the electrode rod 40. Then, it is sprayed from the second injection port 24a while efficiently generating hydroxy radicals having a strong oxidizing action. Thereby, the tar contained in the pyrolysis gas flowing in the gas reforming furnace 12 is suitably reformed (decomposed and removed) by the action of the hydroxy radical.

According to 3rd Embodiment explained in full detail above, the following effects are exhibited in addition to the effect of (1)-(6) of said each embodiment.
(7) Since the photocatalyst 42 decomposes the second modifier by a catalytic reaction and efficiently generates hydroxy radicals, the photocatalyst 42 itself does not deteriorate. For this reason, since it is not necessary to perform maintenance of the photocatalyst 42, the labor of the maintenance can be saved.

(Example of change)
In addition, each said embodiment can also be changed and actualized as follows.
The temperature in the gas reforming furnace 12 may be set to a temperature lower than 800 ° C. as long as the second modifying agent can be decomposed to generate hydroxy radicals.

  -Change the temperature conditions in the gas reforming furnace 12, the first reforming agent, the second reforming agent, etc. as appropriate to generate a large amount of carbon monoxide and hydrogen from the pyrolysis gas, and fuel hydrogen You may make it utilize for a battery, or for the apparatus which manufactures methyl alcohol using a predetermined catalyst from carbon monoxide and hydrogen.

The first modifying agent and the second modifying agent do not necessarily need to be supplied under pressure into the gas reforming furnace 12, and may be simply poured using gravity.
In the gas reforming furnace 12, the first injection port 21a may be positioned downstream of the second injection port 24a in the flow direction of the pyrolysis gas.

In each of the above embodiments, only the second modifier may be supplied into the gas reforming furnace 12.
As shown in FIG. 5, in the gas reforming furnace 12, the flow of the pyrolysis gas is disturbed downstream of the first injection port 21a and the second injection port 24a in the flow direction of the pyrolysis gas. You may arrange | position the several turbulent flow member 50 made into a flow at random. In this way, the turbulent flow member 50 becomes an obstacle and the flow of the pyrolysis gas becomes turbulent, so that the pyrolysis gas, the first modifier, and the second modifier are suitable. Therefore, reforming of the pyrolysis gas can be promoted.

  -Moreover, you may form the said turbulent flow member 50 with the material which hold | maintains heat, such as a ceramic. In this way, since the heat in the gas reforming furnace 12 can be held by the turbulent flow member 50, a temperature drop in the gas reforming furnace 12 can be suppressed.

  In the first embodiment, as shown in FIG. 6, the first supply pipe 21 is connected to an intermediate portion of the second supply pipe 24, and both the first modifier and the second modifier are You may comprise so that it may spray in the said gas reforming furnace 12 simultaneously from one injection port (The said 2nd injection port 24a in FIG. 6).

  In the second embodiment, as shown in FIG. 7, the first supply pipe 21 is connected to an intermediate portion of the second supply pipe 24, and both the first modifier and the second modifier are You may comprise so that it may spray into the said gas reforming furnace 12 simultaneously from one injection port (The said 2nd injection port 24a in FIG. 7).

  -In the said 2nd Embodiment, you may make it a structure as shown in FIG. That is, the second injection port 24 a is configured to be positioned in the vicinity of the inner surface of the gas reforming furnace 12. Then, the honeycomb structure 30 carrying the catalyst is provided on the inner surface of the gas reforming furnace 12 outside the second supply pipe 24 so as to face the second injection port 24a. Further, a partition wall member 60 as a catalyst protection member is provided on the inner surface of the gas reforming furnace 12 so as to cover the second injection port 24a and the honeycomb structure 30 so that the pyrolysis gas flows in the flow direction. The direct contact with the honeycomb structure 30 from the upstream side may be restricted.

  In this way, since the honeycomb structure 30 carrying the catalyst is not in direct contact with the pyrolysis gas, it is possible to suppress the catalyst from being affected by the pyrolysis gas and losing its activity. it can. In this case, only the lower part of the honeycomb structure 30 is opened, and the second modifier sprayed from the second injection port 24a passes through the honeycomb structure 30 and the honeycomb structure 30. Is mixed with the pyrolysis gas at a lower portion of the gas.

  In the third embodiment, as shown in FIG. 9, the first supply pipe 21 is connected to an intermediate portion of the second supply pipe 24, and both the first modifier and the second modifier are You may comprise so that it may spray into the said gas reforming furnace 12 simultaneously from one injection port (the said 2nd injection port 24a in FIG. 9).

The block diagram of the gasification electric power generation system of 1st Embodiment. A sectional view of a gas reforming device of a 1st embodiment. Sectional drawing of the gas reforming apparatus of 2nd Embodiment. Sectional drawing of the gas reforming apparatus of 3rd Embodiment. Sectional drawing of the gas reforming apparatus of the example of a change. Sectional drawing of the gas reforming apparatus of the example of a change. Sectional drawing of the gas reforming apparatus of the example of a change. Sectional drawing of the gas reforming apparatus of the example of a change. Sectional drawing of the gas reforming apparatus of the example of a change.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 12 ... Gas reforming furnace, 21 ... 1st supply pipe | tube as a modifier supply means and a modifier supply pipe, 22 ... 1st tank as a modifier supply means, 23 ... 1st tank as a modifier supply means 1 pump, 24 ... a modifier supply means, a modifier supply pipe and a second supply pipe as a catalyst protection member, 25 ... a second tank as a modifier supply means, 26 ... a second tank as a modifier supply means 2 pump, 27... Gas reformer, 30... Honeycomb structure on which catalyst is supported, 50. Turbulent flow member, 60.

Claims (5)

Equipped with a gas reforming furnace for reforming pyrolysis gas obtained by pyrolysis of the pyrolyzate,
The gas reforming furnace is connected with a reformer supply pipe for supplying a reforming agent for reforming the pyrolysis gas into the gas reforming furnace, and the reforming in the gas reforming furnace. A gas reforming apparatus, wherein a catalyst for improving the reforming function of the agent is disposed in the gas reforming furnace . The said gas reforming furnace, catalyst protection member is provided to protect the catalyst from the pyrolysis gas, the catalyst protective member, from the upstream side in the flow direction of the pyrolysis gas before SL gas reforming furnace 2. The gas reforming apparatus according to claim 1, wherein the gas reforming apparatus is provided so as to restrict the flowing pyrolysis gas from contacting the catalyst. The reformer supply pipe has a front end inserted into the gas reforming furnace, and the catalyst is disposed in the front end, and the reformer is supplied to the gas through the reformer supply pipe. The gas reforming apparatus according to claim 1, wherein the gas reforming apparatus is pressurized and supplied into the reforming furnace. The gas reforming method according to claim 3, wherein a tip of the modifier supply pipe in the gas reforming furnace is opened toward a downstream side in a flow direction of the pyrolysis gas. A gas reforming method for reforming a pyrolysis gas obtained by thermal decomposition of a thermal decomposition product with a modifier,
When reforming the pyrolysis gas, the reforming function of the reforming agent is improved by a catalyst, and then the reforming agent having the improved reforming function is mixed with the pyrolysis gas. Gas reforming method.

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