JP5256661B2 - Gasification method and gasification system - Google Patents

Description

  The present invention relates to a gasification method and a gasification system capable of reducing the amount of catalyst used and gas particles in gasification gas at low cost when gasifying a raw material using a catalyst by a gasification system. It is about.

  In recent years, techniques for producing high-grade gasification gas by gasifying various organic raw materials such as coal, biomass, waste, petroleum residue, heavy oil and the like have been proposed.

  There exists patent document 1 as an example which shows a gasification system. The gasification system shown in Patent Document 1 supplies circulating particles (such as sand) having a high temperature of, for example, 800 ° C. or more to a gasification furnace, and supplies gasifying agents such as water vapor, air, oxygen, and carbon dioxide from the lower part. The gasified gas is generated by supplying the raw material to the fluidized bed formed in this way and fluidly heating it. The gasified gas generated in the gasification furnace is supplied as a fuel for power generation facilities after solids and tar are removed, or as a synthesis gas raw material, or as a gas product compressed and liquefied by a compressor I try to take it out.

  In Patent Document 1, char generated when gasifying a raw material in a gasification furnace is supplied to a combustion furnace together with circulating particles, and the char is combusted by supplying an oxidizing agent such as air or oxygen in the combustion furnace. Thus, the circulating particles are heated to a temperature of, for example, 900 ° C. or higher. Then, the high-temperature circulating particles led out from the combustion furnace together with the exhaust gas are led to a separator such as a cyclone and separated from the exhaust gas, and the separated circulating particles are supplied to the gasification furnace and circulate. Yes.

On the other hand, Patent Document 2 describes a moving bed in which biomass and a catalyst such as zeolite are mixed in the gasification furnace in order to increase the gasification reaction in the gasification furnace (increase the reaction rate). Has been.
JP 2005-41959 A Japanese Patent Application Laid-Open No. 07-207284

  When a catalyst such as zeolite shown in Patent Document 2 or a commonly used catalyst such as limestone is supplied to the gasification furnace, the gasification reaction in the gasification furnace is increased, the throughput of raw materials is increased, and the amount of gasification gas taken out Can be increased. However, the catalyst is generally easily pulverized due to collisions caused by flow in the gasification furnace, and the pulverized catalyst is discharged to the outside together with the exhaust gas. Therefore, the amount of catalyst in the gasification furnace decreases with time, As a result, the gasification reaction decreases with time. For this reason, conventionally, a predetermined amount of catalyst is continuously supplied, but there may be an excess or deficiency of the catalyst necessary for stable operation of the gasifier, which usually causes a shortage of catalyst. It is designed so that it can be supplied frequently with a margin so that it does not occur.

  Although the catalyst is relatively inexpensive, it is still expensive compared to circulating particles such as sand (several times the price for sand). However, the method of supplying the battery has a problem that the operation cost increases.

  The gasification gas taken out from the gasification furnace contains fine particles of heavy metals such as cadmium and mercury, alkali metals such as sodium and potassium, and also contains fine particles of tar. Although it is necessary to remove from the gasification gas, it is necessary to provide a device for removing metal fine particles and a device for removing tar fine particles, respectively, which increases the equipment cost. Had.

  The present invention has been made in view of the above circumstances, and when gasifying a raw material using a catalyst by a gasification system, the amount of the catalyst used can be reduced and fine particles in the gasification gas can be removed at low cost. An object of the present invention is to provide a gasification method and a gasification system.

The present invention relates to a gasification furnace in which a raw material is supplied in the presence of circulating particles, a catalyst, and a gasifying agent, and the raw material is heated to a predetermined temperature to extract a predetermined amount of gasification gas, and a gasification furnace A combustion furnace that heats circulating particles by introducing a mixture of char and circulating particles generated during gasification at a supply pipe and burning the char, and separating and separating the circulating particles from the exhaust gas from the combustion furnace A gasification method for a gasification system comprising: a particle circulation means having a separator for returning circulating particles to the gasification furnace,
A catalyst supply device for supplying a catalyst to the gasification furnace;
A temperature detector for detecting the temperature of the gasification furnace; and a circulation amount regulator for adjusting a circulation amount of the circulating particles from the combustion furnace to the gasification furnace. Temperature control means to control;
A gas production amount detector for detecting the gas concentration and gas flow rate at the gasification furnace outlet to detect the production amount of the gasification gas;
A pressure detector for detecting the pressure of the gasifier,
The temperature control means adjusts the amount of circulating particles to control the temperature of the gasifier so that a predetermined amount of raw material supplied to the gasifier is gasified to generate a predetermined amount of gasified gas. , the pressure of the gasification furnace is detected by the pressure detector at this time and the target pressure, when the pressure of the gasification furnace detected by the pressure detector continues to operation falls below the target pressure was pulverized A gas characterized in that the catalyst is supplied to the gasifier by the catalyst supply device until the pressure of the gasifier is restored to the target pressure, assuming that the amount of the catalyst in the gasifier decreases as the catalyst is discharged to the outside. Is related to the conversion method.

In the gasification method, the amount of gasification gas produced when the target pressure is obtained is detected , a set value is set for the amount of gasification gas production, and the pressure of the gasification furnace is set to the target pressure. when the amount of the gasification gas is also recovered is below than the set value, it is determined that deterioration of the catalyst, together with the circulating particles circulating extracting a portion of the catalyst, the subsequent gasification furnace pressure drops It is preferable to supply the catalyst to the gasifier until the pressure is restored to the target pressure.

  Further, in the above gasification method, by separating the pulverization catalyst in the exhaust gas discharged from the gasification system, the separated pulverization catalyst is brought into contact with the gasification gas from the gasification furnace as a fine particle getter. It is preferable to remove fine particles in the gasification gas.

The present invention provides a gasification furnace that supplies a raw material in the presence of circulating particles, a catalyst, and a gasifying agent and heats the raw material to a predetermined temperature to extract a predetermined amount of gasification gas, and gasification in the gasification furnace A combustion furnace that heats the circulating particles by introducing a mixture of char and circulating particles generated through the supply pipe and burning the char, and the circulating particles separated and separated from the exhaust gas from the combustion furnace A particle circulation means having a separator to be returned to the conversion furnace;
A gasification system comprising:
A catalyst supply device for supplying a catalyst to the gasification furnace;
The temperature which controls the temperature in a gasification furnace which has the temperature detector which detects the temperature of the said gasification furnace, and the circulation amount regulator which adjusts the circulation amount of the circulation particle from the said combustion furnace to a gasification furnace Control means;
A gas production amount detector for detecting the gas concentration and gas flow rate at the gasification furnace outlet to detect the production amount of the gasification gas;
A pressure detector for detecting the pressure of the gasifier,
The temperature control means adjusts the amount of circulating particles to control the temperature of the gasifier so that a predetermined amount of raw material supplied to the gasifier is gasified to generate a predetermined amount of gasified gas. , the pressure of the gasification furnace is detected by the pressure detector at this time and the target pressure, the catalyst pressure detected by the pressure detector continues the operation was pulverized to when it falls below than the target pressure to the outside A catalyst controller that controls the catalyst supply device so that the catalyst is supplied to the gasification furnace until the pressure detected by the pressure detector recovers to the target pressure, assuming that the amount of catalyst in the gasification furnace is reduced . When,
The present invention relates to a gasification system comprising:

In the gasification system, the amount of gasification gas generated when the target pressure is obtained is detected by the gas generation amount detector and input to the catalyst controller. A set value is set, and even if the gasifier pressure recovers to the target pressure, if the amount of gasified gas produced falls below the set value, it is judged that the catalyst has deteriorated, and the circulating cycle It is preferable to provide an extraction device that controls to extract a part of the catalyst together with the particles.

  The gasification system further includes a pulverization catalyst separation device for separating the pulverization catalyst from the exhaust gas from which the circulating particles are separated by the separator, and the pulverization catalyst separated by the pulverization catalyst separation device is introduced. It is preferable to remove the fine particles in the gasification gas by bringing the powdered catalyst into contact with the gasification gas from the gasification furnace as a fine particle getter.

  According to the gasification method and gasification system of the present invention, gasification is performed by supplying a raw material in the presence of circulating particles, a catalyst, and a gasifying agent and heating the raw material to a predetermined temperature to extract a predetermined amount of gasification gas. The furnace pressure was detected, and when the detected gasifier pressure fell below the target pressure, the catalyst was supplied to the gasifier until the gasifier pressure returned to the target pressure. When the pressure in the gasification furnace is reduced by reducing the substantial amount of catalyst in the gasification furnace due to the gasification, the required amount of catalyst is maintained so that the gasification reaction of the gasification furnace is maintained in a predetermined state. Thus, it is possible to automatically supply only the catalyst, and therefore, it is possible to achieve an excellent effect of greatly reducing the cost of the catalyst to be supplied.

  In addition, the amount of gasified gas produced is detected from the gas concentration and gas flow rate at the gasifier exit, and the amount of gasified gas produced falls below the set value even when the gasifier pressure recovers to the target pressure. In this case, it is determined that the catalyst is deteriorated, and a part of the catalyst is extracted together with the circulating particles circulating, and then the catalyst is supplied to the gasifier until the pressure of the gasifier whose pressure has decreased returns to the target pressure. Therefore, there is an effect that the gasification reaction of the gasification furnace can be controlled to be maintained in a predetermined state even when the catalyst is deteriorated.

  In addition, the pulverization catalyst in the exhaust gas discharged from the gasification system is separated, and the separated pulverization catalyst is used as a fine particle getter to come into contact with the gasification gas from the gasification furnace. Therefore, it is possible to obtain an excellent effect that the fine particles in the gasification gas can be removed at low cost by using the pulverization catalyst.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  FIG. 1 is a schematic configuration diagram showing an example of a gasification system of the present invention. In FIG. 1, reference numeral 1 denotes a gasification furnace. Circulating particles 3 are circulated and supplied to the gasification furnace 1 by particle circulation means 2, and a catalyst such as limestone is further supplied to the gasification furnace 1. 4, a gas supply agent 8 for forming a fluidized bed 7 by supplying a gasifying agent 6 such as water vapor, air, oxygen, carbon dioxide or the like by a dispersing device 6 a, coal, biomass, A raw material supply device 10 for supplying a raw material 9 such as waste, petroleum residue, heavy oil or the like to the fluidized bed 7 is provided.

  The particle circulating means 2 introduces char and circulating particles generated during gasification in the gasification furnace 1 through a supply pipe 11 and burns with air 12 (oxidant) supplied from a lower part by a dispersing device 12a. A combustion furnace 13 for heating the circulating particles, a separator 15 for introducing the exhaust gas 14 containing the circulating particles heated by the combustion in the combustion furnace 13 and separating it into the circulating particles 3 and the exhaust gas 14, and the separation And a downcomer pipe 16 for returning the circulating particles 3 separated by the vessel 15 to the gasification furnace 1. That is, FIG. 1 shows a gasification system called a two-column type in which the gasification furnace 1 and the combustion furnace 13 are arranged in parallel. In the figure, reference numeral 17 denotes secondary air (oxidant) supplied to the upper position of the dispersion device 12a in the combustion furnace 13.

  The gasification system includes temperature control means 18 that controls the temperature of the gasification furnace 1 to a predetermined temperature. The temperature control means 18 includes a temperature detector 19 for detecting the temperature of the gasification furnace 1 at the inside of the fluidized bed 7 and a free board part above the fluidized bed 7, and the gas circulation furnace 2 from the combustion furnace 13 by the particle circulation means 2. And a circulation amount regulator 20 that regulates the circulation amount of the circulating particles 3 to be supplied. The circulation amount regulator 20 changes the superficial velocity of the combustion furnace 13 by means of the regulators 21a and 21b that control the supply ratio of the flowing air 12 supplied from the lower part of the combustion furnace 13 and the secondary air 17. The circulation amount of the circulating particles 3 supplied from the combustion furnace 13 to the gasification furnace 1 is adjusted. When the supply amount of the circulating particles 3 to the gasification furnace 1 is increased, the circulating particles in the gasification furnace 1 are increased, the temperature of the gasification furnace 1 is increased, and the circulation particles 3 to the gasification furnace 1 are increased. When the supply amount decreases, the circulating particles in the gasification furnace 1 decrease and the temperature of the gasification furnace 1 decreases. Therefore, the inside of the gasification furnace 1 is always suitable for gasification of the raw material 9 by controlling the circulation amount of the circulating particles 3 by the circulation amount regulator 20 based on the temperature detected by the temperature detector 19 of the temperature control means 18. A predetermined amount of gasified gas 22 is generated by controlling the temperature appropriately.

  The gasification gas 22 generated by gasification in the gasification furnace 1 is guided to the solid separator 23 to separate the solid particles 24, and further to the tar removal device 25 to remove the tar, It is guided as clean gasification gas 22.

  In the gasification system, the gasification furnace 1 detects the pressure inside the fluidized bed 7 and the pressure of the free board portion above the fluidized bed 7, and the gas concentration and gas flow rate of the gasification gas 22. And a gas generation amount detector 27 configured to detect the generation amount of the gasification gas 22 from the detected gas concentration and gas flow rate, the pressure 28 of the gasification furnace 1 from the pressure detector 26, and the gas generation A catalyst controller 30 for inputting the production amount 29 from the amount detector 27 is provided.

  Based on the pressure 28 detected by the pressure detector 26, the catalyst controller 30 adjusts the supply of the catalyst 4 from the catalyst supply device 5 so that the pressure of the gasifier 1 is maintained at the target pressure. The device 31 is controlled. Here, the target pressure is the pressure in the gasification furnace 1 when the raw material 4 is properly gasified in the gasification furnace 1 and a predetermined amount of gasification gas 22 is generated.

  Further, the catalyst controller 30 provides a set value for the generation amount 29 detected by the gas generation amount detector 27. Even if the pressure 28 of the gasifier 1 recovers to the target pressure as described above, When the production amount of the gasification gas 22 falls below the set value, it is determined that the catalyst has deteriorated, and the extraction device 32 provided in the gasification furnace 1 is operated to operate the circulating particles and the catalyst of the gasification furnace 1. Control to extract a part is performed. As for the extraction of the circulating particles and the catalyst, a predetermined amount is extracted based on experience.

  In the illustrated example, a case where a part of the circulating particles and the catalyst is extracted by the extraction device 32 provided in the gasification furnace 1 is shown, but any of the gasification furnace 1, the combustion furnace 13, and the downcomer 16 (downcomer) You may make it take out from one or more.

  At this time, it is more preferable that the char is taken out from one or both of the combustion furnace 13 and the downcomer 16 (downcomer) in which all the char has been burned.

  The operation of the above embodiment will be described.

  In the gasification system of FIG. 1, a predetermined amount of circulating particles 3 is circulated and supplied to the gasification furnace 1 by the particle circulating means 2, and a predetermined amount (not continuously charged) of the catalyst 4 by the catalyst supply device 5. Is further supplied, and the gasifying agent 6 is continuously supplied from the gasifying agent supply device 8 to form the fluidized bed 7. In this state, when a predetermined amount of the raw material 9 is supplied by the raw material supplying device 10, the gasifying agent 6 is gasified. The gasified gas 22 is generated, and the generated gasified gas 22 is taken out from the gasification furnace 1. At this time, the circulation amount of the circulating particles 3 is controlled by the temperature control means 18 so that the inside of the gasification furnace 1 has an appropriate temperature suitable for the gasification of the raw material 9. Gasified gas 22 is generated.

  When the operation of the gasification system described above is continued, the catalyst circulating in the gasification furnace 1 and the combustion furnace 13 together with the circulating particles 3 is pulverized by collision due to flow, etc. In addition, the substantial amount of the catalyst in the gasification furnace 1 decreases with time because the gas is removed together with the gasification gas 22, and the gasification reaction is lowered. The pressure in the gasification furnace 1 gradually decreases.

  Here, since the pressure 28 of the gasification furnace 1 detected by the pressure detector 26 and the generation amount 29 of the gasification gas 22 detected by the gas generation amount detector 27 are input to the catalyst controller 30, catalyst control is performed. As shown in FIG. 2, when the detected pressure 28 of the gasifier 1 falls below the target pressure, the vessel 30 sends a control signal to the catalyst regulator 31 to start supplying the catalyst 4 and gasifies it. The supply of the catalyst 4 is continued until the pressure in the furnace 1 recovers to the target pressure, and the supply of the catalyst 4 is stopped when the pressure in the gasification furnace 1 recovers to the target pressure. Thereby, the gasification performance of the gasification furnace 1 is recovered. Thus, when the pressure in the gasification furnace 1 is reduced by reducing the substantial amount of the catalyst in the gasification furnace 1 due to the pulverization of the catalyst 4, the gasification reaction of the gasification furnace 1 is predetermined. Since only the required amount of the catalyst 4 is automatically supplied so as to be maintained in the state, the cost of the supplied catalyst can be greatly reduced.

  Further, since the catalyst controller 30 is supplied with the generation amount 29 of the gasification gas 22 detected by the gas concentration and the gas flow rate at the outlet of the gasification furnace 1, as shown in FIG. When the pressure 28 of 1 is recovered to the target pressure, the production amount 29 of the gasification gas 22 is lower than the target pressure, that is, when the performance of the gasification furnace 1 is not recovered, the catalyst controller 30 It is judged that the catalyst is deteriorated, and a control signal is sent to the extraction device 32 to control to extract a part of the catalyst together with the circulating particles. After extracting the circulating particles and a part of the catalyst from the gasification furnace 1, a control signal is sent to the catalyst regulator 31 until the pressure of the gasification furnace 1 is restored to the target pressure, and the catalyst 4 is supplied. Thereby, the gasification performance of the gasification furnace 1 is recovered. As described above, when the catalyst 4 is deteriorated, the catalyst 4 is automatically replaced, and the gasification reaction of the gasification furnace 1 can be controlled to be maintained in a predetermined state.

  In addition to the above configuration, FIG. 1 includes a configuration for removing fine particles in the gasification gas.

  That is, a solid separator 34 such as a cyclone that separates fine solid particles 33 from the exhaust gas 14 from which the circulating particles 3 have been separated by the separator 15, and the solid particles 33 separated by the solid separator 34, A pulverized catalyst separation device 37 is provided that separates the pulverized catalyst 35 and the ash 36 by a specific gravity separator using wind power or a multistage cyclone. A catalyst tower 38 is provided in which the pulverized catalyst 35 separated by the pulverized catalyst separation device 37 is introduced to bring the pulverized catalyst 35 into contact with the gasified gas 22 from the gasification furnace 1. By using the powdered catalyst 35 as a fine particle getter, the fine particles in the gasification gas 22 are adsorbed and removed. The powdered catalyst 35 ′ adsorbing the fine particles is used as a raw material for cement or the like, or disposed of in landfill.

  In addition, since the gas particles 22 taken out from the gasification furnace 1 are led to the solid separator 23 and separated, the solid particles 24 are mostly composed of a pulverization catalyst and ash, so that the solid particles 24 are pulverized. The catalyst separation device 39 separates the powdered catalyst 35 and the ash 36, and the separated powdered catalyst 35 is supplied to the catalyst tower 38 as a fine particle getter.

  As described above, the pulverized catalyst 35 is separated from the exhaust gas 14 discharged from the gasification system, or the pulverized catalyst 35 is separated from the gasified gas 22, and the separated pulverized catalyst 35 is led to the catalyst tower 38. By contacting the gasification gas 22 from the gasification furnace 1 as a fine particle getter, heavy metals such as cadmium and mercury, alkali metals such as sodium and potassium, and fine particles such as tar contained in the gasification gas 22 are removed by adsorption. Is done. Since the powdered catalyst 35 has a very large surface area, fine particles can be effectively adsorbed and removed. Thus, by using the powdered catalyst 35, the fine particles in the gasified gas 22 can be removed at low cost.

  In addition, although the case where it applied to the two-column type gasification system was illustrated in the said form, various things, such as a conventionally known fixed bed type gasification furnace, a moving bed type gasification furnace, a fluidized bed type gasification furnace, etc. Needless to say, the present invention can be applied to other gasification furnaces and various modifications can be made without departing from the scope of the present invention.

It is a schematic block diagram which shows an example of the gasification system of this invention. It is a flow sheet which shows the control method of a gasifier.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Gasification furnace 2 Particle circulation means 3 Circulating particles 4 Catalyst 5 Catalyst supply device 6 Gasifying agent 7 Fluidized bed 8 Gasifying agent supply device 9 Raw material 10 Raw material supply device 11 Supply pipe 13 Combustion furnace 14 Exhaust gas 15 Separator 16 Drop Tube (Downcomb)
DESCRIPTION OF SYMBOLS 18 Temperature control means 19 Temperature detector 20 Circulation amount regulator 22 Gasification gas 26 Pressure detector 27 Gas production amount detector 28 Pressure 29 Production amount 30 Catalyst controller 32 Extraction device 35 Powdered catalyst 37 Powdered catalyst separation device 38 Catalyst tower 39 Powdered catalyst separator

Claims (6)

Gasification furnace in which raw material is supplied in the presence of circulating particles, catalyst and gasifying agent and the raw material is heated to a predetermined temperature to extract a predetermined amount of gasification gas, and gasification in the gasification furnace A combustion furnace that heats the circulating particles by introducing a mixture of char and circulating particles generated through the supply pipe and burning the char, and circulating particles separated and separated from the exhaust gas from the combustion furnace A gasification method for a gasification system comprising: a particle circulation means having a separator for returning to a gasification furnace,
A catalyst supply device for supplying a catalyst to the gasification furnace;
A temperature detector for detecting the temperature of the gasification furnace; and a circulation amount regulator for adjusting a circulation amount of the circulating particles from the combustion furnace to the gasification furnace. Temperature control means to control;
A gas production amount detector for detecting the gas concentration and gas flow rate at the gasification furnace outlet to detect the production amount of the gasification gas;
A pressure detector for detecting the pressure of the gasifier,
The temperature control means adjusts the amount of circulating particles to control the temperature of the gasifier so that a predetermined amount of raw material supplied to the gasifier is gasified to generate a predetermined amount of gasified gas. , the pressure of the gasification furnace is detected by the pressure detector at this time and the target pressure, when the pressure of the gasification furnace detected by the pressure detector continues to operation falls below the target pressure was pulverized A gas characterized in that the catalyst is supplied to the gasifier by the catalyst supply device until the pressure of the gasifier is restored to the target pressure, assuming that the amount of the catalyst in the gasifier decreases as the catalyst is discharged to the outside. Method. The amount of gasification gas produced when the target pressure is obtained is detected , a set value is set for the amount of gasification gas production, and gasification is performed even if the pressure of the gasification furnace recovers to the target pressure. when the amount of gas falls below the set value, it is determined that deterioration of the catalyst, circulating extracting a portion of the catalyst with the circulating particles are, then the pressure of the gasifier pressure drops recovered to the target pressure The gasification method according to claim 1, wherein the catalyst is supplied to the gasification furnace until completion.   The pulverization catalyst in the exhaust gas discharged from the gasification system is separated, and the separated pulverization catalyst is used as a fine particle getter to contact the gasification gas from the gasification furnace to remove the fine particles in the gasification gas. The gasification method according to claim 1 or 2. A gasification furnace for extracting a predetermined amount of gasification gas by supplying the raw material in the presence of circulating particles, a catalyst and a gasifying agent and heating the raw material to a predetermined temperature, and a char generated during gasification in the gasification furnace And a circulating furnace for heating the circulating particles by introducing a mixture of the circulating particles through a supply pipe and burning the char, and separating the circulating particles from the exhaust gas from the combustion furnace and returning the separated circulating particles to the gasifier A particle circulation means having a separator;
A gasification system comprising:
A catalyst supply device for supplying a catalyst to the gasification furnace;
The temperature which controls the temperature in a gasification furnace which has the temperature detector which detects the temperature of the said gasification furnace, and the circulation amount regulator which adjusts the circulation amount of the circulation particle from the said combustion furnace to a gasification furnace Control means;
A gas production amount detector for detecting the gas concentration and gas flow rate at the gasification furnace outlet to detect the production amount of the gasification gas;
A pressure detector for detecting the pressure of the gasifier,
The temperature control means adjusts the amount of circulating particles to control the temperature of the gasifier so that a predetermined amount of raw material supplied to the gasifier is gasified to generate a predetermined amount of gasified gas. , the pressure of the gasification furnace is detected by the pressure detector at this time and the target pressure, the catalyst pressure detected by the pressure detector continues the operation was pulverized to when it falls below than the target pressure to the outside A catalyst controller that controls the catalyst supply device so that the catalyst is supplied to the gasification furnace until the pressure detected by the pressure detector recovers to the target pressure, assuming that the amount of catalyst in the gasification furnace is reduced . When,
A gasification system comprising: The amount of gasification gas produced when the target pressure is obtained is detected by the gas production amount detector and input to the catalyst controller, and a set value is set for the amount of gasification gas production detected. There, the when the pressure of the gasifier is the amount of the gasification gas be restored to the target pressure is below the set value, it is determined that the deterioration of the catalyst, a portion of the catalyst with the circulating particles circulating The gasification system of Claim 4 provided with the extraction apparatus controlled so that it may extract.   A pulverization catalyst separation device for separating the pulverization catalyst from the exhaust gas from which the circulating particles have been separated by the separator is provided, and the pulverization catalyst separated by the pulverization catalyst separation device is introduced to make the pulverization catalyst a fine particle getter The gasification system of Claim 4 or 5 provided with the catalyst tower which removes the microparticles | fine-particles in gasification gas by making it contact with the gasification gas from the said gasification furnace.

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