JP2009096893A - Gas flow-carrying method, gas flow-carrying device and gasification apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gas carrying method for supplying a biomass to an entrained bed gasification furnace by a gas flow-carrying method, to provide a gas flow-carrying device, and to provide a gasification apparatus which has the gas flow-carrying device, prevents the damage of the apparatus, and improves the total energy efficiency of the gasification apparatus. <P>SOLUTION: The present invention provides the gas flow-carrying device, characterized by comprising a raw material-supplying portion (11) for supplying as a raw material, a carrying gas-supplying portion (12) for supplying air as a carrying gas, and carrying portions (13, 14) for mixing the biomass supplied from the raw material-supplying portion (11) with air supplied from the carrying gas-supplying portion (12) and gas-carrying the biomass to the entrained bed gasification furnace (16) with the air, wherein the flow speed of the air in the gas flow carriage is controlled to a prescribed range, and the gas carrying method using the device. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an air current conveying method, an air current conveying apparatus, and a gasifier, and more particularly, to an air current conveying method, an air current conveying apparatus, and a gasifier including the same, which supply raw material biomass to an entrained bed gasification furnace.

  In recent years, against the background of soaring fossil resource fuels (coal, oil, natural gas, kerosene, light oil, heavy oil, etc.), global warming problems, etc., development of technologies that use biomass as energy has become active.

  As such a technique, for example, Patent Document 1 discloses a powder and particle supply device that supplies the biomass through a transfer pipe into a gasification furnace that obtains product gas from pulverized biomass. In this granular material supply apparatus, biomass is air-flow conveyed to the gasification furnace by a carrier gas mainly composed of water vapor or the like.

  Here, if a combustion-supporting gas such as oxygen is present in the transfer pipe, backfire may occur from the gasification furnace. In such a case, biomass as a raw material burns in the transfer pipe, It may cause damage to equipment. Therefore, the conventional air current conveyance using an apparatus such as the powder and granular material supply apparatus described in Patent Document 1 has been performed using nitrogen, steam, or the like that does not include a combustion-supporting gas such as oxygen.

JP 2004-91570 A

  However, when supplying raw materials such as biomass to the gasifier by airflow conveyance, in order to prevent flashback from the gasification furnace, etc., when using nitrogen or steam as the carrier gas, Equipment for generating and supplying steam or the like is required, and energy consumption for the operation increases. As a result, there has been a problem that the energy efficiency of the entire gasifier including the apparatus for airflow conveyance and the gasification furnace is reduced, and the construction cost of the entire gasifier is increased.

  Therefore, the present invention has been made in view of such problems, and in the airflow conveying method, the airflow conveying apparatus, and the gasifier including the same, the biomass is supplied to the spouted bed gasification furnace by airflow conveyance. The purpose is to improve the energy efficiency of the entire gasifier.

  As a result of intensive studies to solve the above problems, the inventors of the present invention have carried out airflow conveyance using air as a carrier gas, thereby appropriately controlling the flow rate of the air, thereby enabling the formation of spouted bed gasification. It has been found that the occurrence of flashback from the furnace can be prevented, and the present invention has been completed based on this finding.

  Here, biomass is significantly different from pulverized coal that has been conventionally used as a raw material for gasification reactions in terms of particle size, solid-gas ratio in airflow conveyance, and quality uniformity. It is difficult to envisage behaviors such as airflow characteristics and backfire from the spouted bed gasifier from the gasification of pulverized coal. In addition, no studies have been reported on the gas flow characteristics of biomass gasification and behavior such as flashback from a spouted bed gasifier.

That is, the gist of the present invention is as follows.
(1) In the airflow conveyance method for supplying biomass to the spouted bed gasifier by airflow conveyance, the airflow conveyance is performed using air as a carrier gas, and the flow velocity of air in the airflow conveyance is controlled within a predetermined range. An air flow conveying method characterized by the above.
(2) The airflow conveying method according to (1), wherein a flow velocity of air in the airflow conveying is 15.2 m / sec to 60.2 m / sec.
(3) The airflow conveyance method according to (1) or (2), wherein the average particle size of the biomass is 2 mm to 5 mm.
(4) The air-flow conveying method according to any one of (1) to (3), wherein the solid-gas ratio in the air-flow conveying is 1 to 10.
(5) The air quality conveying method according to any one of (1) to (4), wherein the quality uniformity (L / D) of the biomass is 3 to 10.
(6) A raw material supply unit that supplies biomass as a raw material, an air supply unit that supplies air as a carrier gas, biomass supplied from the raw material supply unit, and air supplied from the air supply unit are mixed And an air flow conveying device, wherein the biomass is transported by air to the entrained bed gasification furnace, and the flow velocity of air in the air flow conveyance is controlled within a predetermined range.
(7) The airflow conveyance device according to (6), wherein a flow velocity of air in the airflow conveyance is 15.2 m / sec to 60.2 m / sec.
(8) The airflow conveying device according to any one of (6) and (7), wherein the average particle size of the biomass is 2 mm to 5 mm.
(9) The raw material supply unit and the air supply unit control the supply amount of the biomass and air to be supplied so that the solid-gas ratio in the air flow conveyance is 1 to 10, (6) ) To (8).
(10) The airflow conveyance device according to (6) to (9), wherein the quality uniformity (L / D) of the biomass is 3 to 10.
(11) A gas comprising the airflow conveying device according to any one of (6) to (10) and a spouted bed gasification furnace for gasifying biomass supplied from the airflow conveying device. Device.

  According to the present invention, by appropriately controlling the flow velocity of air as a carrier gas in an air current conveyance method, an air current conveyance device, and a gasification device including the same, which supply biomass to an entrained bed gasification furnace by air current conveyance, While preventing the occurrence of flashback from the spouted bed gasifier, it is possible to eliminate the need for facilities for generating and supplying nitrogen, steam, etc., which were conventionally required. Therefore, according to this invention, while preventing damage to an installation, the energy efficiency of the whole gasification apparatus can be improved.

  Exemplary embodiments of the present invention will be described below in detail with reference to the accompanying drawings. In addition, in this specification and drawing, about the component which has the substantially same function structure, duplication description is abbreviate | omitted by attaching | subjecting the same code | symbol.

[Configuration and operation of general air current conveying device and gasifier]
Prior to describing an airflow conveying device according to an embodiment of the present invention, first, the configuration and operation of a general airflow conveying device and a gasifier including the same will be described with reference to FIG. In addition, FIG. 2 is explanatory drawing which shows the structure of the gasifier 100 provided with a general airflow conveying apparatus.

  The gasifier 100 is an apparatus that gasifies biomass as a raw material to produce a gas that becomes a fuel or a chemical raw material, and supplies the fuel gas obtained by gasifying the biomass to, for example, the power generation apparatus 200. Specifically, as shown in FIG. 2, the gasifier 100 mainly includes a raw material supply device 110, a carrier gas supply device 120, a mixing device 130, a carrier piping device 140, and a gasification burner 150. A gasification furnace 160, a dust removal device 170, and a gas purification device 180.

  Moreover, a general airflow conveying apparatus is an apparatus that supplies biomass as a raw material to the gasification furnace 160 by airflow conveyance. Specifically, among the configurations exemplified in the gasification apparatus 100, the raw material supply apparatus 110. The carrier gas supply device 120, the mixing device 130, and the carrier piping device 140 are mainly configured.

  The raw material supply device 110 supplies biomass as a raw material to the mixing device 130.

  The carrier gas supply device 120 supplies a carrier gas that carries biomass to the mixing device 130. In the gasifier 100, nitrogen, steam, or the like is used as a carrier gas.

  The mixing device 130 mixes the biomass supplied from the raw material supply device 110 and the carrier gas such as nitrogen or steam supplied from the carrier gas supply device 120.

  The conveying piping device 140 is a conveying path that conveys the biomass mixed with the conveying gas by the mixing device 130 to the gasification furnace 160 by airflow.

  The gasification burner 150 jets the biomass conveyed in the conveyance piping device 140 to the gasification furnace 160 together with air or the like, and burns the biomass.

  The gasification furnace 160 burns biomass therein and generates a product gas mainly composed of hydrogen and carbon monoxide by a partial oxidation reaction. Inside the gasification furnace 160, by controlling the partial oxidation reaction uniformly, it is possible to properly control the complete combustion of biomass as a raw material.

  The dust removing device 170 removes a part of dust and tar (high boiling point component) in the product gas obtained by gasifying biomass in the gasification furnace 160.

  The gas refining device 180 removes dust and residual tar content (low boiling point components), ammonia, hydrogen chloride, sulfuric acid gas, etc. in the product gas from which the high boiling components of dust and tar have been removed by the dust removing device 170, and fuel. Use gas. This fuel gas is supplied to the power generator 200.

Note that, although the allowable amount of heat generation of the fuel gas varies depending on the type of the power generation apparatus 200, for example, the allowable minimum amount of heat generation in the case of a gas engine is set to about 1500 kcal / Nm ³ .

  Here, in a general air flow transfer device (gasification device 100), if a combustion-supporting gas such as oxygen is present in the transfer piping device 140, backfire may occur from the gasification furnace 160. In such a case, biomass as a raw material may burn in the transfer piping device 140 and cause damage to equipment. Therefore, as described above, in a general airflow conveyance device (gasification device 100), nitrogen or steam that does not contain a combustion-supporting gas such as oxygen is used as the carrier gas, and the airflow by the conveyance piping device 140 is used. Transport is in progress.

  However, when supplying biomass, which is a raw material, to the gasification furnace 160 by airflow conveyance, in order to prevent backfire or the like from the gasification furnace 160, when using nitrogen, steam, or the like as the carrier gas, Equipment for generating and supplying nitrogen, steam, and the like is separately required, and energy consumption for operating the equipment increases. As a result, due to the increase in energy consumption, the energy efficiency of the entire gasifier 100 including the airflow transfer device and the gasifier 160 is reduced, and the construction cost and the like of the entire gasifier 100 are also increased. There was a problem.

[Configuration and Operation of Airflow Conveying Device and Gasification Device According to One Embodiment of the Present Invention]
Therefore, in the air flow conveying device according to an embodiment of the present invention and the gasification apparatus equipped with the same, air is conveyed using air as the carrier gas, and the air flow rate is controlled appropriately at this time. Prevents flashback from the furnace.

  Hereinafter, based on FIG. 1, the structure and operation | movement of the airflow conveying apparatus which concerns on this embodiment, and a gasification apparatus provided with the same are demonstrated. In addition, FIG. 1 is explanatory drawing which shows the structure of the gasifier 10 provided with the airflow conveying apparatus which concerns on this embodiment.

  The gasifier 10 is a device that gasifies biomass as a raw material to produce a gas that becomes a fuel or a chemical raw material, and supplies the fuel gas obtained by gasifying the biomass to, for example, the power generation device 20 or the like. Specifically, as shown in FIG. 1, the gasifier 10 mainly includes a raw material supply device 11, a carrier gas supply device 12, a mixing device 13, a carrier piping device 14, and a gasification burner 15. A spouted bed gasification furnace 16, a dust removal device 17, a gas purification device 18, a flow rate measuring device F1, two pressure measuring devices P1 and P2, and a temperature measuring device T1.

  Moreover, the airflow conveying apparatus which concerns on this embodiment is an apparatus which supplies the biomass as a raw material to the spouted bed gasification furnace 16 by airflow conveyance, Specifically, Among the structures mentioned to the said gasification apparatus 10, It is mainly comprised by the raw material supply apparatus 11, the carrier gas supply apparatus 12, the conveyance part (the mixing apparatus 13, the conveyance piping apparatus 14), the flow measuring device F1, the pressure measuring devices P1 and P2, and the temperature measuring device T1.

  The raw material supply device 11 supplies biomass as a raw material to the mixing device 13. This raw material supply device 11 can adjust the supply amount of biomass, and thereby can control the solid-gas ratio in the air current conveyance, as will be described later.

  Here, the biomass in the present embodiment specifically includes, for example, agricultural biomass (straw, sugar cane, rice straw, vegetation, etc.), forestry biomass (paper waste, sawn timber, thinned thinning wood, firewood charcoal forest, etc. ), Livestock biomass (livestock waste), aquaculture biomass (fishery processing residue), waste biomass (raw garbage, refuse-derived fuel (RDF), garden trees, construction waste, sewage sludge, etc.) Point to.

  As a magnitude | size of the biomass used for the gasification reaction which concerns on this embodiment, a thing with an average particle diameter of 2 mm-5 mm can be used.

  Here, a general crusher is accompanied by a screen, and a product that has passed through the screen hole after crushing becomes a crushed product, and its size is equal to or smaller than the screen hole. Therefore, in this embodiment, for example, when the screen hole is 2 mm, it is expressed as “average particle diameter 2 mm”, which is synonymous with “particles having a particle diameter of 2 mm or less”.

  In addition, when the raw material is conveyed by air flow, it is easy to assume the behavior of the raw material if the particle size is small and the size is uniform, but if the particle size is large and uneven, it is difficult to assume the behavior of the raw material. . Since many biomasses have a fiber structure, the power of the crusher is remarkably increased in order to make the size and size as fine as pulverized coal (the power to make the average particle size 1 mm is 2 mm in average particle size). In order to make it unrealistic from the viewpoint of economy, it is common to use those having an average particle diameter of 2 mm to 5 mm.

  In addition, the average particle diameter of the differential coal generally used for the gasification reaction is about 50 to 70 μm, and in the present embodiment, biomass having a size of about 100 times the maximum size of the differential coal and irregular particle sizes is handled. And their behavior is significantly different.

  Moreover, as a measuring method of a particle diameter and an average particle diameter, a laser diffraction system can be used, for example.

  Moreover, the biomass used for the gasification reaction which concerns on this embodiment can use the thing whose uniformity (L / D) of the quality is 3-10. Since many biomasses have a fiber structure, unlike coal, which is a mineral, when crushed, most of the particles have an elongated shape, resulting in a difference in length (L) and diameter (D) in the longitudinal direction. Therefore, L / D (length / diameter) was used as an index of the shape of the particles, and this was regarded as quality uniformity.

  Here, since a particle having a uniformity (L / D) close to 1 like a mineral is close to a sphere, its behavior is easily assumed from conventional powder engineering. On the other hand, particles having a large uniformity (L / D) such as biomass are entangled with each other to form a cotton shape, and it is difficult to assume the behavior from conventional powder engineering.

  Since most biomass has a fiber structure, the power of the crusher is remarkably increased in order to make the L / D equal to that of pulverized coal. It is common to use particles.

  In addition, generally the uniformity (L / D) of the differential charcoal used for the gasification reaction is 1 to 1.5, which is significantly different from the uniformity (L / D) of the biomass used in the present embodiment. To do.

  The carrier gas supply device 12 supplies a carrier gas for carrying the biomass to the mixing device 13. In the gasifier 10 according to the present embodiment, as described above, air is used as the carrier gas. As the carrier gas supply device 12, there is no need to separately provide special equipment for supplying carrier gas as in the general air current carrier device described above. For example, a simple device such as a blower or a compressor is used. By doing so, it is possible to control the supply of the carrier gas and its flow rate. Appropriate control of the air flow rate by this blower or compressor can prevent backfire from the spouted bed gasifier 16. Accordingly, it is not necessary to separately provide special equipment for generating and supplying nitrogen, steam, and the like, which are conventionally required. Thereby, while preventing damage to an installation, the energy efficiency of the gasifier 10 whole can be improved. Moreover, the solid-gas ratio in airflow conveyance can be controlled with the raw material supply apparatus 11 by adjusting the supply amount of air with a blower or a compressor.

  The mixing device 13 mixes the biomass supplied from the raw material supply device 11 and the air supplied from the carrier gas supply device 12. In the mixing device 13, the solid-gas ratio in the air flow conveyance is adjusted, and the biomass mixed with air is supplied to the conveyance piping device 14. The solid-gas ratio is controlled by adjusting the supply amount of biomass supplied from the raw material supply device 11 and the supply amount of air supplied from the carrier gas supply device 12 as described above.

Here, the solid-gas ratio in the present embodiment is a value obtained by dividing the mass (kg) of the solid (biomass) in the unit time during the airflow conveyance by the mass (kg) of air, and is expressed by the following formula (1). expressed.
Solid-gas ratio = mass of biomass in unit time (kg) / mass of air in unit time (kg) (1)

  In the airflow conveyance device according to the present embodiment, it is preferable to control the solid-gas ratio to be 1 to 10. Here, in general, the smaller the solid-gas ratio, the less likely that the clogging in the pipe will occur. However, the larger the solid-gas ratio is desirable from the viewpoint of efficiency, quality, and equipment cost. In the case of a general pulverized coal gasification reaction, the solid-gas ratio in the air current conveyance is about 10 to 30, which is significantly different from the solid-gas ratio in the air current conveyance according to the present embodiment.

  The transport piping device 14 air-transports the biomass mixed with the transport gas by the mixing device 13 to the entrained bed gasification furnace 16. In the airflow conveyance device according to the present embodiment, the flow velocity of air that is a carrier gas at the time of airflow conveyance in the conveyance piping device 14 is controlled within a predetermined range (for example, about 10 m / sec to 100 m / sec). Thereby, even if it is a case where airflow conveyance is performed using the air containing oxygen which is a combustion support gas as conveyance gas, generation | occurrence | production of the backfire from the spouted bed gasification furnace 16 can be prevented. Specifically, from the experimental results for confirming the flow rate at which flashback does not occur in the examples described later, it is possible to control the air flow rate in the range of 15.2 m / sec to 60.2 m / sec during airflow conveyance. preferable. If the air flow rate is less than 15.2 m / sec, backfire from the spouted bed gasifier 16 may occur. Note that if the air flow rate is too high, efficiency problems due to pressure loss and mechanical problems such as piping vibration may occur.

  The mixing device 13 and the transfer piping device 14 described above constitute a transfer unit according to this embodiment.

  Here, in the present embodiment, for example, a blower or a compressor is used as the carrier gas supply device 12 in order to control the flow rate of air to the appropriate range of 15.2 m / sec to 60.2 m / sec. Thus, the flow rate of the air supplied from the carrier gas supply device 12 is controlled.

  In the present embodiment, the measurement of the air flow rate is performed using the flow rate measuring device F1, the pressure measuring devices P1 and P2, and the temperature measuring device T1.

  The flow rate measuring device F <b> 1 is installed between the carrier gas supply device 12 and the mixing device 13 on the upstream side of the carrier piping device 14, and measures the flow rate of air supplied from the carrier gas supply device 12. The pressure measuring device P <b> 1 is installed between the carrier gas supply device 12 and the mixing device 13 on the upstream side of the carrier piping device 14, and measures the pressure of the air supplied from the carrier gas supply device 12. The pressure measuring device P <b> 2 is installed in the spouted bed gasification furnace 16 and measures the pressure in the spouted bed gasification furnace 16. The temperature measuring device T <b> 1 is installed in the spouted bed gasification furnace 16 and measures the temperature in the spouted bed gasification furnace 16.

  By performing temperature correction and pressure correction using the measurement values of the flow rate measuring device F1, the pressure measuring devices P1 and P2, and the temperature measuring device T1 as described above, the flow velocity of air at the time of airflow conveyance is calculated. Specifically, based on Boyle-Charles' law, for example, the flow rate of air as a carrier gas is measured by a flow rate measuring device F1, a temperature measuring device (not shown) and a pressure measuring device P1 at the inlet of the transfer piping device 14. Using the temperature and pressure measured by the pressure measuring device P2 and the temperature measuring device T1 at the outlet of the conveying piping device 14, the molar flow rate calculated at the inlet of the conveying piping device 14 is converted into a volumetric flow rate, and the piping By dividing by the cross-sectional area, the flow velocity can be calculated. The calculated air flow velocity is controlled to be within a predetermined range.

  The gasification burner 15 injects the biomass conveyed in the conveyance piping device 14 into the spouted bed gasification furnace 16 together with air or the like to burn the biomass.

  The spouted bed gasification furnace 16 gasifies the biomass supplied through the gasification burner 15 from the transfer piping device 14 of the airflow transfer device. The supplied biomass burns inside the spouted bed gasification furnace 16 and generates a product gas mainly composed of hydrogen and carbon monoxide by a partial oxidation reaction. Inside the spouted bed gasification furnace 16, it is possible to properly control the complete combustion of biomass as a raw material by uniformly controlling the partial oxidation reaction.

  The dust removing device 17 removes a part of dust and tar (high boiling point component) in the product gas obtained by gasifying biomass in the spouted bed gasification furnace 16.

  The gas refining device 18 removes dust and residual tar content (low boiling point component), ammonia, hydrogen chloride, sulfuric acid gas, etc. in the product gas from which the high boiling components of dust and tar have been removed by the dust removing device 17, and fuel. Use gas. This fuel gas is supplied to the power generator 20.

[Airflow Conveying Method According to an Embodiment of the Present Invention]
As described above, the configuration of the airflow conveying device according to the present embodiment and the gasifier 10 including the airflow conveying device have been described. Hereinafter, the airflow conveying method according to the present embodiment using the airflow conveying device having such a configuration will be described. .

  The airflow conveying method according to the present embodiment is an airflow conveying method for supplying biomass to the spouted bed gasification furnace by airflow conveying, using air as a conveying gas at the time of airflow conveying, and controlling the flow rate of this air within a predetermined range. It is important to. That is, by controlling the flow velocity of the air used as the carrier gas within a predetermined range, even if air is used as the carrier gas at the time of air current conveyance, the occurrence of flashback from the spouted bed gasifier is prevented. be able to.

  As described above, from the results of experiments conducted by the present inventors (see Examples described later), the flow velocity range suitable for preventing the occurrence of flashback from the spouted bed gasifier is 15.2 m. / Sec to 60.2 m / sec has been confirmed to be preferable. Here, if the flow velocity of air is less than 15.2 m / sec, there is a risk of backfire from the spouted bed gasifier 16.

  Moreover, as a magnitude | size of the biomass used with the airflow conveyance method which concerns on this embodiment, a thing with an average particle diameter of 2 mm-5 mm can be used.

  Moreover, as a biomass used with the airflow conveyance method which concerns on this embodiment, it is preferable to use the thing whose uniformity (L / D) of the quality is 3-10.

  Moreover, in the airflow conveyance method which concerns on this embodiment, it is preferable to control so that the solid-gas ratio in airflow conveyance may be set to 1-10.

  In addition, in the airflow conveying method according to the present embodiment, examples of biomass that can be used in the present embodiment other than the matters described above, a method for measuring a flow rate, a method for measuring an average particle size of biomass, and uniformity (L / D The definition and measurement method, the definition of the solid-gas ratio, and the like are the same as those described in the airflow conveyance device according to the present embodiment, and thus the details are omitted.

As described above, according to the airflow conveyance device and the airflow conveyance method according to the present embodiment, air can be used as a conveyance gas when the biomass is airflow-transported, and thus nitrogen, steam, and the like that are conventionally necessary are generated. This eliminates the need for equipment to be supplied, thereby improving the energy efficiency of the gasifier 10 as a whole. Specifically, for example, when considering the case where gas generated by a gasifier is used for a power generation device, self-consumption is 50% of the power generation capacity, and an N ₂ production device is used as a carrier gas supply device. In such a case, the N ₂ manufacturing apparatus is ¼ of self-consumption (12.5% of the power generation capacity). Therefore, according to the airflow conveyance device and the airflow conveyance method according to the present embodiment, the actually usable power (power transmission end) is 62.5 ÷ 50 = 1.25 (times). That is, the energy efficiency of the entire gasifier is improved by 25%.

  Hereinafter, a more specific description will be given using examples. In the present embodiment, verification was performed on the flow velocity of air, which is a carrier gas, to prevent backfire from the spouted bed gasifier.

  In the present example, a biomass gasification plant having a processing scale of 150 kg / h (amount of biomass that can be gasified) as shown in FIG. 2 was used. Specifically, two 20A steel pipes are used as the transfer piping device 14 described above, an air compressor is used as the transfer gas supply device 12, and the raw material biomass is spouted bed gasification furnace by air flow transfer using air. The flow rate of air that does not cause backfire from the spouted bed gasifier to the transfer piping device was identified. The gasification temperature during the gasification operation in the spouted bed gasifier was about 1,100 ° C. In addition, the flow rate of air is corrected by temperature and pressure using the flow rate and pressure measuring devices installed on the upstream side of the transfer piping device and the pressure and temperature measuring devices installed in the spouted bed gasifier as described above. Went. As biomass raw materials, wood chips crushed to 5 mm or less and wheat straw generated by beer production were used. Uniformity L / D was obtained by reducing 1 kg of a randomly collected raw material 6 to 7 times and observing 10 g of the collected material with a microscope to calculate an average value. Under such conditions, by carrying the air flow with the air having the flow velocity shown in Table 1 below, the backfire from the spouted bed gasification furnace is prevented even if the air containing the oxygen that is the combustion supporting gas is carried. It was confirmed that gasification operation can be performed safely without any occurrence.

  On the other hand, as a comparative example, a biomass gasification plant as shown in FIG. 1 was used. Specifically, the same operation was performed using nitrogen as the carrier gas and a nitrogen supply device as the carrier gas supply device 120, and the presence or absence of flashback was confirmed. As a result, it was confirmed that the backflow does not occur in the airflow conveyance using air according to the present example under the same conditions as the airflow conveyance using nitrogen.

  As mentioned above, although preferred embodiment of this invention was described referring an accompanying drawing, it cannot be overemphasized that this invention is not limited to this example. It will be apparent to those skilled in the art that various changes and modifications can be made within the scope of the claims, and these are naturally within the technical scope of the present invention. Understood.

  For example, in the above-described embodiment, the case where the carrier gas supply device performs control of the air flow rate during the airflow conveyance has been described. However, the control of the air flow velocity during the airflow conveyance is performed by the mixing device or the conveyance device. A piping device may do.

  In the above-described embodiment, the case where the gasifier 10 is provided with the dust removing device 17 and the gas purifying device 18 has been described. However, the dust removing device 17 and the gas purifying device 18 are not necessarily provided. In addition, it may be provided as necessary depending on the use of the product gas gasified in the spouted bed gasifier.

It is explanatory drawing which shows the structure of the gasification apparatus provided with the airflow conveying apparatus which concerns on one Embodiment of this invention. It is explanatory drawing which shows the structure of a gasifier provided with a general airflow conveying apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Gasifier 11 Raw material supply apparatus 12 Air supply apparatus 13 Mixing apparatus 14 Transfer piping apparatus 15 Gasification burner 16 Spouted bed gasification furnace 17 Dust removal apparatus 18 Gas purification apparatus F1 Flow measuring instrument P1 Pressure measuring instrument P2 Pressure measuring instrument T1 Temperature Measuring instrument

Claims (11)

In the air flow conveying method of supplying biomass to the spouted bed gasifier by air flow conveyance,
The air flow conveyance is performed using air as a carrier gas,
An airflow conveying method, wherein a flow velocity of air in the airflow conveying is controlled within a predetermined range.   The airflow conveying method according to claim 1, wherein a flow velocity of air in the airflow conveying is 15.2 m / sec to 60.2 m / sec.   The airflow conveying method according to claim 1 or 2, wherein an average particle diameter of the biomass is 2 mm to 5 mm.   The air flow conveyance method according to claim 1, wherein a solid-gas ratio in the air flow conveyance is set to 1 to 10.   The airflow conveying method according to any one of claims 1 to 4, wherein the quality uniformity (L / D) of the biomass is 3 to 10. A raw material supply unit for supplying biomass as a raw material;
A carrier gas supply unit for supplying air as a carrier gas;
Mixing the biomass supplied from the raw material supply unit and the air supplied from the carrier gas supply unit, and conveying the biomass by air flow to the spouted bed gasifier,
With
An airflow conveying apparatus that controls a flow rate of air in the airflow conveying to a predetermined range.   The airflow conveying device according to claim 6, wherein a flow velocity of air in the airflow conveying is 15.2 m / sec to 60.2 m / sec.   The airflow conveying device according to claim 6, wherein the biomass has an average particle diameter of 2 mm to 5 mm.   The said raw material supply part and the said conveyance gas supply part control the supply amount of the said biomass and air which are supplied so that the solid-gas ratio in the said airflow conveyance may be 1-10, It is characterized by the above-mentioned. The airflow conveying device according to 8.   The airflow conveyance device according to claim 6, wherein the biomass has a quality uniformity (L / D) of 3 to 10. The airflow conveying device according to any one of claims 6 to 10,
A spouted bed gasification furnace for gasifying biomass supplied from the airflow conveying device;
A gasification apparatus comprising:

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