JP4550690B2 - Char transporter with coarse grain separation function - Google Patents

Description

  The present invention relates to a char transport device used to return char separated and recovered from produced gas of a coal gasifier to a coal gasifier, and in particular, separates char into coarse particles and fine particles, The present invention relates to a char transport device that transports the char. Moreover, this invention relates to the coal gasification system provided with the said char conveyance apparatus.

  The product gas discharged from the coal gasifier generally contains char containing unburned carbon. For this reason, an ordinary coal gasification system includes a char circulation system that recovers char from the generated gas and returns it to the coal gasification furnace. As the char circulation system, char is collected by a cyclone, a predetermined amount of char is transferred to a transfer device by mechanical means adopting a lock hopper system, and the char is air-flowed by the transfer device and supplied to the coal gasifier. A method is known. A classifier is provided in the hopper to remove lump char and return the fine char to the coal gasifier. It is also known that char separated by a cyclone is separated into coarse particles and fine particles using an air flow, and the fine particles are returned to the coal gasifier (see, for example, Patent Document 1).

JP 10-81886 A (summary)

  The lock hopper method is used, and a classifier such as a sieve or mesh is installed in the hopper to remove the lump and transport fine particles. In many cases, it is transferred to a char transport device, and there is a problem in the separation performance of coarse particles. When coarse particles are transferred into the container, they accumulate in the container and cause clogging, and a certain amount of char cannot be stably conveyed. The method of separating coarse particles and fine particles using an air flow and returning the fine particles to the coal gasification furnace often causes fine particles to be discharged together with the coarse particles, which causes a problem in fine particle separation performance.

An object of the present invention is to improve separation performance of fine particles and coarse particles in a char transfer device that separates coarse particles and fine particles using an air flow and conveys the fine particles.

  The present invention includes a container having a char discharge port at the upper and lower parts, an inclined plate therein, and an inlet of the char so that the char conveyed on the side of the container collides with the inclined plate, It is in the char transport device provided with the auxiliary gas blowing port on the side of the container below the char inlet. In the present invention, char is supplied into the container by an air flow, fine particles and coarse particles are separated by an air flow flowing from the bottom upward in the container, and the fine particles are entrained in the air flow from an outlet provided in the upper part of the container. It is transported to a coal gasification furnace, where coarse particles are dropped by gravity and discharged from an outlet provided in the lower part of the container.

  The char conveyance device of the present invention is excellent in the separation performance of fine particles and coarse particles, and can convey fine particles efficiently.

In the char transport device of the present invention, an inclined plate is provided inside the container into which the char transported by the air current is introduced, and an inlet of the char transported by the air current is provided on the side of the container so that the inflowed char collides with the inclined plate. It is desirable to provide a side wall below the inclined plate to narrow the coarse drop passage . The position where the auxiliary gas is blown is also important. The role of the auxiliary gas is to create an updraft in the container and to transfer the fine particles of the char flowing into the container to the upper part of the container along with the updraft. Therefore, blowing inlet of the auxiliary gas Rukoto be placed in a container side portion is provided with side walls is desirable. The fine particles separated by the airflow flowing in the container are transported from the discharge port provided at the upper part of the container accompanied by the airflow, and the coarse particles are dropped by gravity to be discharged from the discharge port provided at the lower part of the container. Discharge to improve the separation performance of fine and coarse particles .

In char conveying apparatus of the present invention, after the coarse particles falling passage is narrowed portion of the lower inclined plate in the container, not by desirable to provide a portion that is enlarged flow path again. The effect by these is demonstrated in the Example mentioned later .

In the char transfer device of the present invention, it is desirable that a portion where the flow path is reduced is provided again after the portion where the flow path is enlarged again, and an auxiliary gas blowing port is also provided there. The effect by these is demonstrated in the Example mentioned later .

  Examples of the present invention will be described below with reference to the drawings, but the present invention is not limited to the following examples.

  FIG. 1 shows a schematic view of a coal gasification system equipped with a char carrier device of the present invention. The coal gasification system of the present embodiment includes a coal supply system, a gasification furnace, and a char circulation system.

  First, the coal supply system will be described. In the coal supply system, a pulverizer 1 for crushing coal, an atmospheric pressure hopper 2, a lock hopper type atmospheric pressure-pressure hopper 4, a coal supply hopper 5, and pulverized coal 3 are mixed with a carrier gas 8. A mixer 7 and a distributor 10 are provided. In the coal supply system, first, the pulverizer 1 pulverizes the coal into pulverized coal 3. The pulverized pulverized coal is sequentially supplied to the normal pressure hopper 2, the normal pressure-pressure hopper 4, and the coal supply hopper 5 by operating the valves 37, 37a, 37b, and 37c. The pulverized coal 3 supplied to the coal supply hopper 5 is discharged by a rotary feeder 6 and conveyed to a mixer 7 such as an ejector. The pulverized coal transported to the mixer 7 is air-flow transported by a transport gas 8 made of an inert gas such as nitrogen or carbon dioxide, and sent to the distributor 10 through the transport line 9. And it is supplied to the coal burner 11 of the coal gasifier 18.

  Although the pulverized coal generally contains foreign matters such as wood chips, the foreign matter may accumulate on the mixer 7 or the distributor 10 and the equipment may be blocked. A classifier is installed in the normal pressure hopper 2 to remove wood chips and the like. In addition, a load cell 53 is installed in the coal supply hopper 5, and the weight of the pulverized coal is measured by this load cell so as to open and close the upstream valve 37b and the downstream valve 37c.

  Next, the gasifier will be described. Coal gasification systems include a pressurized fluidized bed coal gasification system that employs a fluidized bed system, a spouted bed coal gasification system that employs a spouted bed system, and the present invention can be applied to either of them. In the examples, a spouted bed type coal gasification system is shown. The coal burner 11 is supplied with pulverized coal sent from the coal supply system and gasifying agent such as oxygen sent from the coal gasifying agent supply line 14. In the gasification reaction section 20 of the coal gasification furnace 18, the pulverized coal and the gasifying agent come into contact with each other in the air stream, and the coal is gasified to generate a combustible gas rich in hydrogen and carbon monoxide. The produced gas is discharged out of the furnace through the gasifier outlet line 22. Since the temperature of the gas in the coal gasification furnace is a high temperature of 1600 ° C. or higher, the ash content in the pulverized coal melts into slag, that is, molten ash. The slag passes through the slag tap provided in the coal gasification furnace 18 and falls into the water filling unit 19 to be cooled and solidified. The cooled and solidified slag 23 is periodically collected by the slag collector 16 and discarded.

  Next, the char circulation system will be described. The char circulation system includes a cyclone 25, a cyclone hopper 26, a lock hopper type char recovery hopper 28, a char supply hopper 29, a rotary feeder 30, a mixer 31 for mixing char with a carrier gas 32, and the present invention. The char transport device 38 is provided.

  The produced gas discharged from the coal gasification furnace 18 is separated from the char 27 by the cyclone 25. The product gas from which the char has been separated is sent to the gas purifier 35 through the product gas line 36. The char 27 collected by the cyclone 25 is sent to the cyclone hopper 26 and the char collection hopper 28 through the connecting pipe 59. If the amount of the char 27 in the char collection hopper 28 increases, the switching valve 55a is closed, and the pressure of the char collection hopper 28 is made equal to or slightly higher than the pressure of the char supply hopper 29. Next, the switching valve 55 b on the outlet side of the char recovery hopper 28 is opened, and the char 27 is transferred into the char supply hopper 29. When the transfer of the char to the char supply hopper 29 is completed, the switching valve 55 b is closed, and the pressure of the char recovery hopper 28 is made the same as the pressure of the coal gasification furnace 18. Then, the switching valve 55a on the inlet side of the char collection hopper 28 is opened, and the steady operation is started. This pressurization and decompression operation is repeated at predetermined time intervals. Since the temperature of the char 27 is around 450 ° C., the char circulation system is usually kept at around 200 ° C. so that the char 27 does not condense.

The char 27 collected by the cyclone 25 has an average particle size as small as about 10 μm and a true specific gravity of about 2300 kg / m ³ and is very light. Moreover, it is a powder solid with strong adhesion. In addition, the char 27 includes a lump of 20 mm or more or a peeled plate-like material attached to the wall of the gasification furnace heat recovery unit 21, depending on gasification conditions. The plate-like material is formed by solidifying char powder. Such coarse powder accumulates inside the rotary feeder 30 and the mixer 31 and causes clogging and the like. Therefore, normally, a classifier (not shown) is installed in the char collection hopper 28 to remove coarse lump. The switching valves 55a to 55c are provided in a connecting pipe 59 that connects the hoppers of the char circulation system. The char supply hopper 29 is generally provided with a load cell 61 for weight measurement. The high temperature char 27 stored in the char supply hopper 29 is quantitatively discharged by the rotary feeder 30 and introduced into the mixer 31. In the mixer 31, a gas such as an inert gas or a gasification furnace product gas is used as the carrier gas 32, and the char is air-carryed and transferred to the char carrier device 38 of the present invention.

  In the char transfer device 38, coarse particles contained in the char are separated and fine char is sent to the char burner 34 through the char transfer line 33 and returned to the coal gasifier 18. Oxygen 15 for gasifying the char is supplied from the char burner 34.

  In this char circulation system, when the char transport device of the present invention is not provided, coarse char mainly in the shape of an elongated plate that has passed through the classifier installed in the char collection hopper 28 flows into the mixer 31. There is a risk of accumulation. However, by providing the char transport device of the present invention, the diameter of the outlet of the mixer 31 can be increased, so that even if a coarse char flows in, it can be discharged without causing clogging. Since the char conveyance device of the present invention has excellent separation performance between coarse particles and fine particles, fine char can be stably circulated to the coal gasifier.

  Next, the char transport device of the present invention will be described. 2 to 5 show one embodiment of the char transport device according to the present invention, FIG. 2 is a longitudinal sectional view showing the entire structure, FIG. 3 is a view taken along the line A-A in FIG. 2 is a view taken along the line B-B in FIG. 2, and FIG. 5 is a view taken along the line C-C in FIG. 2. FIG. 2 shows a mixer 31 that mixes the char 27 with the carrier gas 32 and a coarse particle collector 39 that collects the coarse particles discharged from the char carrier device 38.

  The char transport device 38 has a fine char discharge port 33 in the upper part of a cylindrical container 90 and a coarse char discharge port 93 in the lower part. The coarse char discharge port 93 is provided with a valve 40. An inclined plate 70 is provided inside the container 90. Further, a side wall 68 is provided below the inclined plate 70 below the inclined plate 70. A coarse grain flow path 69 is formed by the side surface of the container 90 and the side wall 68. The coarse drop flow passage 69 has a semicircular cross section as shown in FIG. The fine-grain char discharge port 33 is provided above the coarse-grain falling flow passage 69 in the vertical direction. As a result, the fine particles are easily conveyed along with the upward flow. An inlet of a char inflow pipe 65 through which the char transported from the mixer 31 flows is provided in the container wall near the inclined plate 70. The char flows into the container from the lateral direction and collides with the inclined plate 70. An auxiliary gas blowing pipe 67 is provided below the position where the char inflow pipe is provided on the container wall. In this embodiment, the auxiliary gas blowing pipes are installed at three locations in the circumferential direction of the container as shown in FIG.

  In the char transport device 38, an upward flow is formed by the gas blown from the auxiliary gas blowing pipe 67. The char that has flowed into the container from the char inflow pipe 65 collides with the inclined plate and the flow velocity is weakened. It is conveyed toward. The coarse char 81 is not accompanied by the rising airflow and falls downward due to gravity.

  The amount of the carrier gas 32 that transports the char into the container 90 is adjusted by the flow rate control valve 32a, thereby setting the gas flow velocity in the vicinity of the inclined plate 70 of the container 90, and at the char inlet. Avoid particle retention in the vicinity.

  In order to improve the separation performance of coarse particles and fine particles, it is important to flow the char into the container 90 from the lateral direction, particularly from the horizontal direction, and the angle of the inclined plate is important. The angle of the inclined plate is set to 25 to 35 degrees, particularly 30 to 40 degrees with respect to the central axis of the char inflow pipe 65 provided so that the char flows into the container from the horizontal direction. As a result, it was found that the sticking of char can be prevented and fine particles and coarse particles can be separated efficiently.

  Of the char that has collided with the inclined plate 70, most of the fine particles are discharged from the fine char discharge port 33 in the upper part of the container. However, a considerable amount of fine particles still passes through the coarse drop flow passage 69. Flows downward. Therefore, the auxiliary gas whose flow rate is adjusted by the flow rate adjusting valve 67a is blown into the container from the lateral direction, and a gas curtain is formed by the auxiliary gas to prevent the fine particles from falling. By blowing the auxiliary gas from a narrow channel portion formed by the side wall 68 and the container side surface, a gas curtain can be formed with a small flow rate, and the influence on the wear and the like of the container can be reduced. The size of the coarse particle flow path 69 should be as narrow as possible within the range in which the coarse particles can be dropped. Specifically, it should be suppressed to 1.2 times the size of the coarse particles. desirable.

  FIG. 15 shows the relationship between the end speed of char and the average particle diameter of char. The horizontal axis represents the average particle diameter of char, and the vertical axis represents the end velocity of char. From FIG. 15, it can be seen that the larger the particle size to be separated and removed, the higher the terminal speed of char. For example, in order to separate and collect coarse particles having a size of 10 mm or more, it is understood that the termination speed must be set to 3.0 m / s or more. When the particle size of the char supplied to the coal gasification furnace is 10.0 mm, the gas velocity in the container 90 of the char transfer device may be set to 3.0 m / s, whereby coarse particles of 10.0 mm or more are obtained. Falls down in the container. The determination of whether or not the char particles are classified and conveyed satisfactorily depends on the differential pressure level between the pressure gauge 42 of the mixer 31 and the pressure gauge 45 of the coarse particle collector 39, and the pressure gauge 82 of the char conveyance line 33. Depending on the pressure level.

  FIG. 16 shows the particle diameter of the char 27 in the cyclone hopper 26 installed on the upstream side of the char transport device 38 and the char particles extracted from the coarse particle collector 39 installed on the downstream side of the char transport device 38. It is the experimental result which showed the relationship between a diameter and the cumulative weight ratio of char. The horizontal axis represents the particle size of char, and the vertical axis represents the cumulative weight frequency of char. 50% of the cumulative weight frequency represents the average particle size. The char in the cyclone hopper 26 used in the experiment contains 1% of particles having a size of 10 mm or more. In the char extracted from the coarse particle collector 39, particles of 10.0 mm or more are recovered 100%, and all the lump in the char in the cyclone hopper 26 is recovered.

  FIG. 17 shows the relationship between the speed of the gas supplied from the mixer 31 to the char transport device 38, that is, the speed of the gas flowing through the char inflow pipe 65, and the peel weight of the char attached to the char inflow pipe 65. . It was found that particles adhering to the char inflow pipe began to exfoliate when the gas velocity was increased to 3 m / s or more. Therefore, when it is desired to remove a lump having a particle size or larger, the gas flow rate in the char transport device 38 may be set based on the terminal velocity. Further, the char circulation system is kept warm at around 200 ° C. so that the char does not condense. Therefore, if the pressure of the coal gasification furnace 18, the inner diameter of the char transport line, and the amount of transport gas are known, the inner diameter of the container of the char transport device is determined.

  In the coal gasification system of FIG. 1, a coarse grain lock hopper 62 is provided downstream of the coarse grain collector 39, and a coarse grain normal pressure hopper 63 is further provided downstream thereof. The valve 40 installed between the char transport device 38 and the coarse particle collector 39 is always opened except when the char transport line 33 is clogged and closed. The valve 83 between the coarse particle collector 39 and the coarse particle lock hopper 62 is also normally opened, and the weight value of the load cell 50 installed in the coarse particle collector 39 shows a predetermined value and the coarse particle char is filled. When judged, the pressure of the coarse-grain lock hopper 62 is made the same as that of the coarse-grain collector 39, and then the valve 83 is opened. When the coarse lock hopper 62 is full, the valve 83 is closed. Thereafter, the pressure is reduced by the pressure regulating valve 46 a of the coarse-grained lock hopper 62, and then the valve 85 installed at the lower part of the coarse-grained lock hopper 62 is opened and collected in the coarse-grained normal pressure hopper 63. When the inside of the coarse-grained normal pressure lock hopper 63 is emptied by the operation of the valve 86, the valve 85 and the pressure control valve 46a below the coarse-grain lock hopper 62 are closed, and then the coarse-grain lock hopper pressurizing nitrogen control valve 43b is used. An inert gas is circulated in the coarse-grained lock hopper 62 through the lock hopper pressurizing nitrogen line 44a and set to be equal to the pressure of the coarse-grain collector 39. Repeat this operation.

  The char is generated from the coal gasification furnace until the char transport line 33 is restored from the blockage. Therefore, as a countermeasure, a char extraction line 64 connecting the mixer 31 and the coarse particle collector 39 is provided in FIG. The procedure for extracting the char by the char extraction line 64 is to close the valve 64b, bring the inside of the char transport line 33 and the char supply hopper 29 to normal pressure, close the flow control valve 32a, the valves 40, 83 and the switching valve 55c, and extract the char. This is done by opening the valve 64a installed in the line 64, starting the rotary feeder 30, and then opening the switching valve 55c and transferring it into the coarse particle collector 39.

  The control system for controlling the char circulation system includes an instruction value of each pressure of the coal gasification furnace 18, the mixer 31 and the char supply hopper 29, a load cell 61 laid on the char supply hopper 29 and the coarse particle collector 39, A data processing device 48 for calculating an appropriate value of the differential pressure, a supply amount, and the like based on the data obtained from 50 is provided. Further, a control device 49 for operating the flow rate of the conveying gas and the opening and closing of the valves installed above and below the coarse particle collector 39 in accordance with the numerical values and signals obtained by the data processing device 48 is provided. The opening / closing operation of the valve is performed by transmitting operation signals 51, 77, 77a, 78, 79, etc. from the control device 49. Further, thermometers 47 and 47a are installed below the coarse particle collector 39 and the coarse particle lock hopper 62, and the temperature indication values of the thermometers 47 and 47a are monitored to confirm the state of coarse particle recovery. FIG. 18 shows the fluctuation of the indicated value of the thermometer 47a installed in the coarse particle collector 39 in relation to the operation time of the coal gasifier. The temperature in the coarse particle collector 39 changes in conjunction with the opening / closing operation of the valve 40 and the valve 83. The valve 40 was closed at (1) in FIG. 18, the valve 83 was opened at (2), and the valve 83 was closed at (3). During this time, the char in the coarse particle collector is discharged to the outside. The temperature in the coarse particle collector decreased by several tens of degrees Celsius due to the discharge of char. When the valve 40 was opened in (4) and the steady operation of transferring the coarse char recovered by the char transport device 38 to the coarse collector was started, the temperature rose and remained stable at a certain temperature. In (5), the valve 40 is closed and the same process is repeated again. If the temperature drops in a steady state, the char transfer device and the coarse particle collector are blocked for some reason and the coarse char no longer falls, or the coarse particles in the char introduced into the char transfer device Indicates that there is no.

  In the present embodiment, the case where the char transport device 38 is provided after the char collection hopper 28, the char supply hopper 29, and the mixer 31 has been described. This configuration is very suitable, but is not limited to this. The object of the present invention can also be achieved by air-carrying the char collected from the product gas of the coal gasification furnace and flowing directly into the char transport device of the present invention.

  Another embodiment of the char transport device will be described with reference to FIGS. 6 is a longitudinal sectional view of the char transport device, FIG. 7 is a view taken along the line AA in FIG. 6, FIG. 8 is a view taken along the line BB in FIG. 6, and FIG. FIG. 2 to 5 is different from the char transport device shown in FIGS. 2 to 5 in that a flow path reducing portion 71 is provided in the lower part of the container 90, and subsequently a falling flow having a cross-sectional area substantially equal to the coarse particle falling flow passage 69. The discharge pipe 72 is provided, and the auxiliary gas blowing pipe 74 is also provided there. The flow rate adjusting valve 73 is installed in the auxiliary gas blowing pipe 74, and a predetermined flow rate of auxiliary gas is circulated in two stages, so that the separation efficiency of fine particles and coarse particles can be further improved. The size of the flow path of the falling flow discharge pipe 72 is not necessarily equal to the size of the flow path of the coarse-grained falling flow passage 69. The smaller the flow path diameter, the higher the flow rate of the updraft and the fine particles can be prevented from falling.

  In FIG. 6, a flow path expanding portion 99 is provided in the lower part of the coarse particle falling flow passage 69. By providing the flow path expanding section, the flow velocity of the falling flow is reduced, and the amount of coarse particles that turn up can be reduced.

  Still another embodiment of the char transport device will be described with reference to FIGS. 10 is a longitudinal sectional view of the char transport device, FIG. 11 is a view taken along the line AA in FIG. 10, FIG. 12 is a view taken along the line BB in FIG. 10, and FIG. FIG. 14 and FIG. 14 are DD arrow views of FIG. The difference between this embodiment and Embodiment 1 and Embodiment 2 is that the side wall 68 in the container is lengthened so that it reaches the lower part of the container, and auxiliary gas blowing pipes are installed at a plurality of locations in the coarse particle falling direction. This is to improve the separation efficiency between fine particles and coarse particles. In FIG. 10, auxiliary gas blowing pipes are provided at two locations of the coarse particle falling flow passage 69.

It is a schematic block diagram of the coal gasification system by one Example of this invention. It is an enlarged view of the char conveyance apparatus in FIG. It is an AA arrow line view of FIG. It is a BB arrow line view of FIG. It is CC arrow line view of FIG. It is a schematic block diagram which shows another Example of a char conveyance apparatus. It is an AA arrow line view of FIG. It is a BB arrow line view of FIG. It is CC arrow line view of FIG. It is the schematic block diagram which showed another char transport apparatus. It is an AA arrow line view of FIG. It is a BB arrow line view of FIG. It is CC arrow line view of FIG. It is a DD arrow line view of FIG. FIG. 5 is a diagram showing the relationship between the average particle diameter of char and the terminal velocity of char. It is the figure which compared the particle size distribution of the char in a char supply hopper and a coarse-grain collection | recovery device. It is the figure which showed the gas velocity at the time of peeling the particle | grains adhering to the wall of the char inflow pipe | tube of a char conveyance apparatus inlet in relation with the char peeling weight. It is the figure which showed a mode that the indication value of the thermometer installed in the coarse-grain collection | recovery device fluctuates with the operation time of a coal gasifier.

Explanation of symbols

  18 ... Coal gasifier, 25 ... Cyclone, 26 ... Cyclone hopper, 27 ... Char, 28 ... Char recovery hopper, 29 ... Char supply hopper, 30 ... Rotary feeder, 31 ... Mixer, 32 ... Carrier gas, 33 ... Fine Grain char discharge port 34 ... Char burner 38 ... Char transport device 39 ... Coarse recovery unit 65 ... Char inflow pipe 67 ... Auxiliary gas blowing pipe 68 ... Side wall 69 ... Coarse drop flow passage 70 ... Inclined plate, 71... Channel reducing portion, 72 .. falling flow discharge pipe, 74 .. auxiliary gas blowing pipe, 90 .. container, 93.

Claims (12)

A char transport device that uses air current to separate the char into coarse and fine particles, and transports the fine particles with the air flow. The char transport device is inclined to the inside of the container that has char discharge ports at the top and bottom. And a char inflow port on the side surface of the container so that the char flowing into the container collides with the inclined plate, and narrows the flow path in the container below the inclined plate. A side wall is provided, a side surface of the container where the side wall is provided is provided with an auxiliary gas blowing port, and fine particles separated by the air current flowing in the container are entrained by the air current and provided at the top of the container A char conveying device with a coarse particle separation function, wherein the coarse particles are conveyed from the discharge port and fall by gravity and discharged from a discharge port provided at a lower portion of the container. 2. The coarse particle separation according to claim 1, wherein a width of a flow path formed by the side wall and the side surface of the container is larger than a maximum particle of char and 1.2 times or less of a maximum particle size. Char transport device with function. 2. The char transport device with a coarse grain separation function according to claim 1, wherein a fine grain outlet is provided at a vertically upper portion of a flow path formed by the side wall and the container side face. 2. The char transport device with a coarse particle separation function according to claim 1, further comprising an inlet for char transported to the side of the container so that the char transported by the air flow flows into the container from a lateral direction. . 2. The char transfer device with a coarse grain separation function according to claim 1, wherein the auxiliary gas is blown into a side surface of the container so that the auxiliary gas flows into the container from a lateral direction. 2. The char transfer device with a coarse particle separation function according to claim 1, wherein the auxiliary gas blowing port is provided at a plurality of locations on a side surface of the container. A char transport device that uses air current to separate the char into coarse and fine particles, and transports the fine particles with the air flow. The char transport device is inclined to the inside of the container that has char discharge ports at the top and bottom. A char inlet is provided on the side of the container so that the char flowing into the container collides with the inclined plate, and the flow path in the container is narrowed below the inclined plate. A side wall is provided, an auxiliary gas blow-in port is provided on the side of the container where the side wall is provided, a portion where the flow path is enlarged is provided below the side wall, and the fine gas separated by the airflow flowing in the container is provided. The particles are entrained in an air stream and conveyed from an outlet provided in the upper part of the container, and the coarse particles are dropped by gravity and discharged from an outlet provided in the lower part of the container. Char transport with coarse grain separation function Location. 8. The char transport device with a coarse grain separation function according to claim 7, wherein a fine grain outlet is provided at an upper part in a vertical direction of a flow path formed by the side wall and the container side face. 8. The char transport device with a coarse grain separation function according to claim 7, further comprising an inlet for the char transported by airflow so that the char transported by airflow flows into the container from a lateral direction. 8. The char transfer device with a coarse particle separation function according to claim 7, further comprising an auxiliary gas blowing port so that the auxiliary gas flows into the container from a lateral direction. A char transport device that uses air current to separate the char into coarse and fine particles, and transports the fine particles with the air flow. The char transport device is inclined to the inside of the container that has char discharge ports at the top and bottom. And a char inflow port on the side surface of the container so that the char flowing into the container collides with the inclined plate, and narrows the flow path in the container below the inclined plate. A side wall is provided, an auxiliary gas blowing port is provided on a side surface of the container where the side wall is provided, a channel is enlarged below the side wall, and the channel is below the enlarged portion. A portion in which the flow path is reduced again is provided, and an auxiliary gas blowing port is further provided in the portion in which the flow path is reduced again, and fine particles separated by the air flow flowing in the container are entrained in the air flow and the container It is conveyed from the outlet provided at the top of the , Coarse coarse particle separation function char conveying apparatus according to claim to fall it has to be discharged from a discharge port provided at the bottom of the container by gravity. 12. The char transport device with a coarse grain separation function according to claim 11, further comprising an inlet for the char transported by airflow so that the char transported by airflow flows into the container from a lateral direction.

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