JP2011021061A - Gasification method, refining method, and gasification apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gasification method that produces non-tar-containing gas without using expensive porous alumina and also simultaneously produces a desulfurization catalyst usable as a slagmaking material and a recarburizer for steelmaking. <P>SOLUTION: The gasification method which performs thermal decomposition of organic matter into tar-containing gas and a charcoal-like solid by heating the organic matter includes: a charcoal-like solid recovery step for recovering the charcoal-like solid produced through the thermal decomposition; a tar removal step for producing non-tar-containing gas obtained by bringing tar-containing gas produced through the thermal decomposition into contact with a desulfurization catalyst to remove tar contained in the tar-containing gas; and a recovery step for recovering the produced non-tar-containing gas and the desulfurization catalyst after the contact with the tar-containing gas. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a gasification method in which tar is removed from a tar-containing gas using a desulfurization catalyst to generate a tar-free gas, a refining method in which refining is performed using the desulfurization catalyst used in the gasification method, and the gas The present invention relates to a gasification apparatus for performing a gasification method.

  Biomass is attracting attention as an energy source with a small environmental load. Biomass is a biological resource excluding fossil resources, for example, organic matter such as wood, paper, agricultural residues, manure, and food waste. The energy obtained from biomass is one of so-called renewable energy and is called biomass mass energy. Renewable energy means that the amount of carbon dioxide absorbed by a living organism and the amount of carbon dioxide emitted when biomass derived from that organism is burned are offset by the same amount on a global scale. This means that the current atmospheric carbon dioxide concentration does not increase even if is used.

Biomass energy is used, for example, using a gasification power generation device (for example, Patent Document 1). The gasification power generation device includes a gasification device and a generator. The gasifier generates flammable gas by pyrolyzing biomass at a high temperature of 400 ° C. or higher, and the generator generates power using the gas generated by pyrolysis as fuel.
However, in the gasification of biomass, tar is generated together with charcoal and combustible gases such as carbon monoxide, methane, and ethane. The generated tar is vaporized at the time of thermal decomposition, but when it is sent to the generator and the temperature drops, it adheres to the piping that constitutes the generator, causing malfunction or failure of the generator. .

  The present inventor proposes a method of supporting tar on a porous inorganic substance as a solid carbonaceous substance by bringing the tar-containing gas into contact with a porous inorganic substance, for example, aluminum oxide, as a method for removing the tar from the tar-containing gas. did.

A porous inorganic material (hereinafter referred to as a support) on which a carbonaceous material is supported is superior in storage and transportability compared to electric power. For this reason, it has become possible to produce charcoal and carrier from biomass in forestry areas rich in wood resources, and to transport surplus charcoal and carrier to demand areas where there is energy demand. In demand areas, energy can be extracted as tar-free hydrogen gas by bringing the charcoal or carrier into contact with water vapor. In addition, aluminum oxide can be recovered and reused from the demand area to which the carrier is supplied.
In the system configured as described above, it is possible to effectively use biomass energy by linking a forestry area that is rich in biomass resources but poor in energy demand with an area that is scarce in biomass resources but in high energy demand.

However, since porous aluminum oxide is generally expensive, in the conventional system, it is indispensable to recover the porous inorganic material after generating hydrogen gas from the demand area, and it is necessary to recover the aluminum oxide. A system that does not work was desired.
The recovery route of the porous inorganic material can be secured, and the supply amount of the carrier and the recovery amount of aluminum oxide need only be balanced. However, there is a problem when the recovery amount of aluminum oxide is greatly reduced. In order to continue the operation of the gasification power generation apparatus, it is necessary to take out hydrogen from the support and regenerate aluminum oxide, or to newly manufacture expensive porous alumina.
Note that Patent Document 1 does not disclose means for solving such a problem.

Japanese Patent No. 3980382

Under such circumstances, as a result of intensive studies by the inventor of the present application, the tar contained in the tar-containing gas can be removed using a desulfurization catalyst as waste used in petroleum refining. It became clear that desulfurization catalysts can be used as steelmaking materials and carburizing materials.
The present invention has been made in view of such circumstances, and an object thereof is to generate a tar-free gas without using expensive porous alumina by performing tar removal using a desulfurization catalyst. Another object of the present invention is to provide a gasification method, a refining method, and a gasification apparatus that can produce a desulfurization catalyst that can be used as a steelmaking material and a carburizing material for steelmaking.

  The gasification method according to the present invention is a gasification method in which an organic substance is heated to thermally decompose the organic substance into a tar-containing gas and a carbonaceous solid. A tar removal step for producing a tar-free gas from which the tar contained in the tar-containing gas is removed by bringing the tar-containing gas generated by thermal decomposition into contact with a desulfurization catalyst; and the generated tar-free gas And a recovery step of recovering the desulfurization catalyst after contact with the tar-containing gas.

  The gasification method according to the present invention is characterized in that the desulfurization catalyst is obtained by drying, pulverizing or granulating a residue of a desulfurization catalyst used in petroleum refining.

  The refining method according to the present invention is characterized by refining molten steel by adding the desulfurization catalyst recovered by the gasification method described above to a steelmaking furnace.

  A gasification apparatus according to the present invention is a gasification apparatus for recovering a carbonaceous solid produced by thermal decomposition in a gasification apparatus that heats the organic substance to thermally decompose the organic substance into a tar-containing gas and a carbonaceous solid. A tar removal means for producing a tar-free gas from which the tar contained in the tar-containing gas has been removed by bringing the tar-containing gas generated by thermal decomposition into contact with a desulfurization catalyst, and the generated tar-free gas And a recovery means for recovering the desulfurization catalyst after contacting the tar-containing gas.

According to the present invention, first, an organic substance is heated, and the organic substance is thermally decomposed into a tar-containing gas and a carbonaceous solid. The carbonaceous solid generated by pyrolysis is recovered.
Next, the tar-containing gas generated by pyrolysis is brought into contact with a desulfurization catalyst. As the desulfurization catalyst, for example, waste used as a desulfurization catalyst in petroleum refining can be used. The desulfurization catalyst has a function of decomposing tar contained in the tar-containing gas into a non-tar-containing gas such as hydrogen or carbon monoxide and supporting it as a carbonaceous material. For this reason, a tar non-containing gas can be produced | generated by making a tar containing gas and a desulfurization catalyst contact. And the produced | generated tar non-containing gas and the desulfurization catalyst after contacting a tar containing gas are collect | recovered.
The tar-free gas is a useful energy source and can be used in, for example, a gasification power generation apparatus. On the other hand, the desulfurization catalyst after contacting the tar-containing gas can be used as a steelmaking material and a carburizing material.

  According to the present invention, tar is removed using a desulfurization catalyst obtained by drying and pulverizing a residue of a desulfurization catalyst used in petroleum refining. By drying and grinding the desulfurization catalyst, the total surface area of the desulfurization catalyst is increased. Further, the desulfurization catalyst becomes a porous material, and the tar decomposition function is expected to increase.

  According to this invention, a desulfurization catalyst contains various metal oxides, such as nickel used as a raw material for steel manufacture, an alumina oxide, and the carbonaceous material carry | supported on the surface of the desulfurization catalyst. These have functions as a steelmaking raw material, steelmaking material and carburizing material in steelmaking.

  In the present invention, a tar-free gas can be generated without using expensive porous alumina, and a desulfurization catalyst that can be used as a steelmaking material and a carburizing material can be produced together. it can.

It is explanatory drawing which shows notionally the gasification method and refining method which concern on embodiment of this invention. It is a graph which shows an example of a composition of a petroleum desulfurization catalyst residue. It is a graph which shows the drying test result of the petroleum desulfurization catalyst residue using a muffle furnace. It is typical sectional drawing which shows the structural example of the gasifier which concerns on this invention. It is a schematic diagram which shows the structural example of a desulfurization catalyst particle manufacturing apparatus. It is a schematic diagram which shows the structural example of the steelmaking furnace which enforces the refining method which concerns on this invention. It is typical sectional drawing which shows the structural example of the gasifier which concerns on a modification.

Hereinafter, the present invention will be described in detail with reference to the drawings illustrating embodiments thereof.
<Gasification and refining methods>
FIG. 1 is an explanatory diagram conceptually showing a gasification method and a refining method according to an embodiment of the present invention. The gasification method according to the present invention is a desulfurization catalyst obtained by pyrolyzing biomass (organic matter) into a tar-containing gas and a carbonaceous solid, and drying and pulverizing a petroleum desulfurization catalyst residue (desulfurization catalyst) as waste. The particles (desulfurization catalyst) are used to remove the tar contained in the tar-containing gas, and at the same time produce carbon-supported desulfurization catalyst particles that can be used as a steelmaking material and a carburizing material. The carbon-supported desulfurization catalyst particles are desulfurization catalyst particles supporting a carbonaceous material.
Hereinafter, a method for producing desulfurization catalyst particles necessary for tar removal will be described first, and then a method for producing a tar-free gas and a refining method will be described in order.

In the gasification method according to the present embodiment, first, a petroleum desulfurization catalyst residue as a waste used in petroleum refining is prepared. The petroleum desulfurization catalyst residue is a pale white clay-like substance containing moisture.
FIG. 2 is a chart showing an example of the composition of the petroleum desulfurization catalyst residue. The upper column of the chart shows the composition of the petroleum desulfurization catalyst residue on the wet base, and the lower column shows the composition on the dry base. As shown in the chart, the petroleum desulfurization catalyst residue is mainly composed of aluminum oxide Al ₂ O ₃ , nickel oxide NiO, cobalt oxide CoO, vanadium oxide V ₂ O ₅ , iron oxide Fe ₂ O ₃ , sodium oxide Na ₂ O. , Silicon dioxide SiO ₂ , containing moisture. The above composition is an example of a petroleum desulfurization catalyst residue, and a petroleum desulfurization catalyst residue different from the above composition may be used.

  Next, as shown in FIG. 1, the petroleum desulfurization catalyst residue is dried and pulverized to produce desulfurization catalyst particles. The desulfurization catalyst particles are for removing tar by decomposing tar contained in the tar-containing gas and supporting it as a carbonaceous substance. The petroleum desulfurization catalyst residue is a lump of clay-like substance containing water, and even if the tar-containing gas described later is brought into contact with the petroleum desulfurization catalyst residue, the tar cannot be effectively removed. It is necessary to process the catalyst residue into solid granular desulfurization catalyst particles. Specifically, the petroleum desulfurization catalyst residue may be dried and pulverized using a rotary kiln. The drying and pulverization treatment of the petroleum desulfurization catalyst residue may be performed in the air. The diameter of the desulfurized catalyst particles after pulverization is about 5 mm to 1 mm. In addition, the range of about 5 mm-1 mm is an example, and the diameter of a desulfurization catalyst particle is not specifically limited.

  FIG. 3 is a graph showing the results of a drying test of petroleum desulfurization catalyst residue using a muffle furnace. The horizontal axis of the graph indicates the drying temperature at which the petroleum desulfurization catalyst residue is dried using a muffle furnace, and the vertical axis indicates the weight of the petroleum desulfurization catalyst residue after drying. The drying time for the petroleum desulfurization catalyst residue is 60 minutes. As can be seen from the graph of FIG. 3, the water contained in the petroleum desulfurization catalyst residue can be removed by heating at 200 ° C. or higher.

  Next, a method for producing a tar-free gas using desulfurization catalyst particles will be described. As shown in FIG. 1, in the gasification method according to the present invention, the biomass is converted into charcoal (charcoal solid) and tar-containing gas by heating the woody biomass at 400 to 600 ° C., for example, 550 ° C. Pyrolysis and recovering charcoal produced by pyrolysis.

  The tar-containing gas includes a combustible non-condensable gas containing hydrogen, carbon monoxide, carbon dioxide, lower hydrocarbon gas, and the like, and tar gas. Tar gas is a condensable compound that becomes liquid or solid when cooled to room temperature, that is, vaporized tar. Here, the condensability means the property of becoming a liquid or a solid at normal temperature and normal pressure. The tar-containing gas is in a state in which tar vapor is contained in the non-condensable gas in an uncooled state immediately after thermal decomposition.

  Next, the tar-containing gas generated by pyrolysis is brought into contact with the desulfurization catalyst particles, thereby generating a tar-free gas from which the tar contained in the tar-containing gas is removed. When the tar contained in the tar-containing gas comes into contact with the desulfurization catalyst particles, the tar is decomposed into hydrogen, carbon monoxide, carbon dioxide and the like, and a carbonaceous material is supported on the surface of the desulfurization catalyst particles. And the carbon carrying | support desulfurization catalyst particles after contacting the produced | generated tar non-containing gas and tar containing gas are each collect | recovered. The recovered tar-free gas is used, for example, as power generation energy of a gasification power generation apparatus.

Next, the refining method will be described. First, a main raw material containing a metal raw material and carbon-supported desulfurization catalyst particles as a carburizing material and a carburizing material are charged into an electric furnace, which is a melting furnace. Needless to say, when the carbon-supported desulfurization catalyst particles as the slagging material and the carburizing material are insufficient, other slagging material and carburizing material may be added. Then, the main raw material and the carbon-supported desulfurization catalyst particles are dissolved by arc discharge in an electric furnace. By the melting, for example, stainless steel coarse molten steel and slag floating on the coarse molten steel are formed. Hereinafter, refining of stainless steel will be described as an example. Nickel oxide NiO, iron oxide Fe ₂ O _{3 and the} like contained in the carbon-supported desulfurization catalyst particles are reduced by a carbonaceous material functioning as a reducing agent. Reduced nickel Ni, iron Fe, and the like are main components of stainless steel and are absorbed into the molten steel. On the other hand, sulfur S contained in the molten steel is absorbed into the slag. Hereinafter, stainless steel is obtained through separation of molten steel and slag, predetermined out-of-core refining treatment, casting treatment, and the like. Since these processes are known techniques, a detailed description thereof will be omitted.

  Hereinafter, an apparatus for carrying out the gasification method according to the present invention will be described. First, the gasifier according to the present invention will be described, and then the desulfurization catalyst particle manufacturing apparatus 3 and the refining apparatus will be described.

<Gasifier>
FIG. 4 is a schematic cross-sectional view showing a configuration example of the gasifier according to the present invention. The gasifier according to the present invention includes a thermal decomposition apparatus 1 that thermally decomposes biomass into a carbonaceous solid and a tar-containing gas, and a tar removal apparatus that removes tar from the tar-containing gas and simultaneously produces carbon-supported desulfurization catalyst particles. 2 is provided.

  The thermal decomposition apparatus 1 covers the biomass accumulated on the ground surface from above, thereby housing the biomass and carbonizing it, and the eaves member 12 for holding the biomass in a fixed position in the housing 11. With. The eaves member 12 has a box shape with an upper opening, and is formed by welding a plurality of reinforcing bars. On the ground surface, a seal member 14 that seals between the housing 11 and the ground surface is installed.

  The housing 11 is made of a metal having a hollow box shape with an open bottom, and a fire inlet 13 is provided at the lower end of the outer wall of the housing 11. A smoke exhaust pipe 15 is provided at the lower end of the other outer wall facing the outer wall. Furthermore, a hook for lifting the casing 11 with a crane or a forklift is provided on the ceiling surface of the casing 11 (not shown).

The fire inlet 13 has a hollow, substantially rectangular parallelepiped shape formed at the lower end of the outer wall of the casing 11 and communicates with the interior of the casing 11. An air intake opening is formed on the side surface of the firing port 13. Further, an opening for burning is formed on the upper surface of the firing port 13, and the opening is configured to be opened and closed by a lid.
Note that the above-described configuration of the fire inlet 13 is merely an example, and other configurations may be used as long as the configuration allows the interior of the housing 11 to be heated and air can be taken in. Further, the opening for burning and the opening for taking in air may be configured separately.

  The flue gas pipe 15 is a pipe for discharging tar-containing gas generated by thermal decomposition of biomass in the housing 11 to the outside of the housing 11, and is connected to the tar removing device 2.

The tar removing device 2 includes a vertically long cylindrical reaction vessel 21, and the reaction vessel 21 is disposed inside a combustion heating furnace (not shown) that heats the reaction vessel 21. For example, a hopper 22 for supplying desulfurization catalyst particles to the reaction vessel 21 is provided via a rotary valve 23 at the desulfurization catalyst particle inlet 21b formed at the upper part of the reaction vessel 21. The reaction vessel 21 has a gas inlet 21a at the lower end side and a gas outlet 21d at the upper end side. The gas inlet 21a is connected with a flue gas pipe 15 communicating with the casing 11 of the thermal decomposition apparatus 1, and the tar-containing gas generated by the thermal decomposition of biomass flows into the reaction vessel 21, and the desulfurization catalyst particles. It is configured to flow through the accumulation. When the tar-containing gas and the desulfurization catalyst particles come into contact with each other, the tar contained in the tar-containing gas is decomposed, and a carbonaceous material is supported on the surface of the desulfurization catalyst particles. As a result, the tar-free gas and the carbon-supported desulfurization catalyst particles are produced together.
The reaction vessel 21 has a carbon-supported desulfurization catalyst particle discharge port 21c for discharging the carbon-supported desulfurization catalyst particles at the lower end. A carbon-supported desulfurization catalyst particle recovery unit 25 that recovers the carbon-supported desulfurization catalyst particles via a rotary valve 24 is provided at the carbon-supported desulfurization catalyst particle outlet 21c.

  The usage method and operation of the gasifier configured as described above will be described. First, the eaves member 12 is disposed at a predetermined position for carbonization, and the biomass is stored inside the eaves member 12. And the housing | casing 11 is covered so that the eaves member 12 which accommodated biomass may be covered. Subsequently, a fire is performed through the fire inlet 13, the internal temperature of the housing 11 is increased, and the biomass is pyrolyzed under a predetermined condition. The tar-containing gas generated by the thermal decomposition of the biomass is discharged to the reaction vessel 21 of the tar removing device 2 through the smoke exhaust pipe 15.

  Then, desulfurization catalyst particles are supplied to the hopper 22 and the rotary valves 23 and 24 are driven. By driving the rotary valves 23 and 24, desulfurization catalyst particles are supplied to the reaction vessel 21, and the desulfurization catalyst particles move from above to below while contacting the tar-containing gas in the reaction vessel 21. The carbon-supported desulfurization catalyst particles generated by the contact with the tar-containing gas are discharged downward by driving the rotary valve 24 and recovered by the carbon-supported desulfurization catalyst particle recovery unit 25. The tar-free gas from which tar has been removed by contact with the desulfurization catalyst particles is sent to the outside through the pipe 26 from the gas outlet 21d.

<Desulfurization catalyst particle production equipment>
FIG. 5 is a schematic diagram illustrating a configuration example of the desulfurization catalyst particle manufacturing apparatus 3. The desulfurization catalyst particle production apparatus 3 is, for example, a rotary kiln and includes a hollow rotating cylindrical body 31a. The rotating cylindrical body 31a is rotatably supported by a support device (not shown) in such a posture that its central axis is inclined with respect to the horizontal plane. An inlet 31b into which petroleum desulfurization catalyst residue is introduced is formed in the inside of the rotary cylinder 31a, and an hopper for supplying a petroleum desulfurization catalyst residue is formed at the end of the upstream side of the rotating cylinder 31a in the tilt direction. 31e is provided. A discharge port 31c through which desulfurization catalyst particles generated by drying and pulverization of the petroleum desulfurization catalyst residue is provided at the end of the rotating cylinder 31a on the downstream side in the inclination direction. In addition, a stirring plate (not shown) for stirring and pulverizing the petroleum desulfurization catalyst residue is provided on the inner peripheral surface of the rotating cylindrical body 31a.

  On the radially outer side of the rotating cylindrical body 31a, a cylindrical heating air flow path 31d having an inner diameter larger than the outer shape of the rotating cylindrical body 31a and a length in the central axis direction shorter than the rotating cylindrical body 31a is connected to the rotating cylindrical body 31a. It is arranged coaxially. The cylindrical heating air flow passage 31d is hollow inside, and a plurality of combustion gas supply portions 31f are provided around the end surface of the cylindrical heating air flow passage 31d on the downstream side in the inclination direction at a predetermined interval. An exhaust cylinder 31g is provided on the upstream side in the inclination direction of the cylindrical heated air flow path 31d.

  The rotating cylindrical body 31a is configured to rotate at a predetermined speed around the central axis by a drive mechanism (not shown). For example, the drive mechanism includes a spur gear formed on the outer peripheral surface of the rotating cylindrical body 31a, a small gear that meshes with the spur gear, and a motor that rotates the small gear. The rotational speed of the motor may be set so that the time from when the petroleum desulfurization catalyst residue charged through the charging port 31b is thermally decomposed and discharged from the discharging port 31c is about 10 minutes.

  The usage method and operation of the desulfurization catalyst particle production apparatus 3 configured as described above will be described. First, the petroleum desulfurization catalyst residue is put into the hopper 31e, and the rotating cylindrical body 31a is heated and rotated. The petroleum desulfurization catalyst residue moves inside the rotary cylinder 31a from the upstream side in the tilt direction to the downstream side in the tilt direction by the rotation of the rotary cylinder 31a, and is pulverized and dried by the stirring plate. Then, the dried and pulverized desulfurization catalyst particles are discharged to the outside from the discharge port 31c of the rotating cylindrical body 31a.

<Smelting equipment>
FIG. 6 is a schematic diagram showing a configuration example of a refining apparatus that performs the refining method according to the present invention. The refining apparatus includes an electric furnace 4 and a ladle 5 for taking out molten steel and slag produced from the electric furnace 4. The electric furnace 4 is, for example, a three-phase AC arc furnace, has a substantially cylindrical shape with a bottom open, and substantially closes a furnace body 41 having a steel outlet 41a and an opening of the furnace body 41 so as to be openable and closable. And a disk-shaped furnace lid 42. The furnace lid 42 is formed with three through-holes penetrating substantially vertically, and a graphite electrode 43 penetrates through each through-hole so as to be moved up and down. Three-phase alternating current is applied to the three graphite electrodes 43. Since the details of the configuration of the furnace body 41, the furnace lid 42, the graphite electrode 43 and the ladle 5 and the method of using the refining apparatus are known techniques (for example, Japanese Patent Application Laid-Open No. 2005-337560), detailed description thereof is omitted. .

  In the gasification method, gasification apparatus, and refining method according to the present embodiment configured as described above, the waste used as a desulfurization agent in petroleum refining can be used as a tar remover, A tar-free gas can be generated without preparing expensive porous alumina.

Further, by using the carbon-supported desulfurization catalyst particles according to the present invention instead of the aluminum ash used in the electric furnace 4 for producing stainless steel, aluminum oxide Al of the petroleum desulfurization catalyst residue, which was originally a waste, is used. ₂ O ₃ , nickel oxide NiO, etc. can be reused as resources, and even carbon in tar gas can be used as a reducing agent.

(Modification)
Since the gasifier according to the modification differs only in the configuration of the thermal decomposition apparatus 101, the differences will be mainly described below.

  FIG. 7 is a schematic cross-sectional view illustrating a configuration example of a gasifier according to a modification. The pyrolysis apparatus 101 includes a pyrolysis reactor 111. The pyrolysis reactor 111 has a hollow cylindrical shape, and is installed in a substantially horizontal posture inside an external hot air heating tank type combustion heating furnace 112 that heats the pyrolysis reactor 111 to 400 to 600 ° C. A hopper 114 for supplying biomass into the pipe is coupled to a biomass supply port provided at one end of the pyrolysis reactor 111, and supplied to the interior of the pyrolysis reactor 111 from the hopper 114 and the biomass supply port. A conveying screw 113 for conveying the biomass to the other end side is provided. The pyrolysis reactor 111 has a charcoal discharge port and an exhaust port at the other end. A pipe 115 that guides the tar-containing gas and water vapor generated by pyrolysis of biomass to the reaction vessel 21 is connected to the exhaust port, and a charcoal recovery unit 116 that recovers the remaining charcoal is provided at the charcoal discharge port. Yes. The other end of the pipe 115 communicates with the reaction vessel 21 of the tar removing device 2.

  The operation and effect of the gasifier according to the modification are the same as in the embodiment.

  The embodiment disclosed this time is to be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the meanings described above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

DESCRIPTION OF SYMBOLS 1 Thermal decomposition apparatus 2 Tar removal apparatus 3 Desulfurization catalyst particle manufacturing apparatus 4 Electric furnace 5 Ladle 11 Case 12 Firewood member 13 Fire inlet 14 Seal member 15 Flue pipe 25 Carbon carrying desulfurization catalyst particle recovery device 41 Furnace main body 41a Steel output Mouth 42 Furnace 43 Graphite electrode 116 Charcoal recovery unit

Claims (4)

In the gasification method of thermally decomposing the organic matter into a tar-containing gas and a carbonaceous solid by heating the organic matter,
A carbonaceous solid recovery step for recovering the carbonaceous solid produced by pyrolysis;
A tar removal step of producing a tar-free gas from which the tar contained in the tar-containing gas is removed by bringing the tar-containing gas generated by pyrolysis into contact with a desulfurization catalyst;
And a recovery step of recovering the produced non-tar-containing gas and the desulfurization catalyst after contact with the tar-containing gas. The desulfurization catalyst is
The gasification method according to claim 1, wherein the residue of the desulfurization catalyst used in petroleum refining is dried, pulverized or granulated.   A refining method comprising refining molten steel by adding the desulfurization catalyst recovered by the gasification method according to claim 1 or 2 to a steelmaking furnace. In a gasifier that thermally decomposes organic matter into a tar-containing gas and a carbonaceous solid by heating the organic matter,
A carbonaceous solid recovery means for recovering the carbonaceous solid produced by pyrolysis;
A tar removing means for generating a tar-free gas from which the tar contained in the tar-containing gas is removed by bringing the tar-containing gas generated by thermal decomposition into contact with a desulfurization catalyst;
A gasification apparatus comprising: the generated tar-free gas; and recovery means for recovering the desulfurization catalyst after contact with the tar-containing gas.

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