JP6700774B2 - Powder transfer device, char recovery device, powder transfer method, and gasification combined cycle power generation facility - Google Patents

Description

  The present invention relates to a powder carrying device, a char recovery device, a powder carrying method, and a gasification combined cycle power generation facility.

  The gasification combined cycle power generation facility (coal gasification combined cycle power generation facility) supplies carbon-containing solid fuel such as coal into a gasification furnace (coal gasification furnace), and partially burns the carbon-containing solid fuel to gasify it. This is a power generation facility that aims to improve power generation efficiency by combining a carbonized fuel gasification device (coal gasification device) that produces combustible gas with a combined cycle power generation facility. The integrated coal gasification combined cycle facility is equipped with a coal gasification furnace that gasifies coal to produce combustible product gas. Char (unreacted content of carbon-containing solid fuel such as coal and ash content) contained in the produced gas is recovered by the char recovery device and then supplied to the coal gasification furnace for reuse as fuel. The char recovery device includes a char bin and a char feeding hopper. The char recovered from the produced gas is stored in the char bin and then supplied to the coal gasification furnace via the char supply hopper.

  The char stored in the char bin is conveyed to the char supply hopper by the powder conveying device. The powder carrying device includes a chute pipe having an inclined flow path. The angle of inclination of the chute pipe with respect to the horizontal plane is set to an angle larger than the angle of repose, which is the angle at which the char is conveyed by its own weight drop without being blocked in the pipe, and the char is conveyed so as to slide down the chute pipe by the action of gravity To be done. For example, when the angle of repose of the char is 45[°] or more and 50[°] or less, the inclination angle of the chute pipe may be set to an angle larger than the angle of repose, for example, 60 to 70[°].

  Further, in the prior art, a sluice valve that shuts off the conveyance of char is provided in the flow path that connects the charbin and the chute pipe, and a flow path that connects the chute pipe and the char supply hopper has a sealing property higher than that of the sluice valve. A high airtight valve is provided. When starting to convey char, the sluice valve is opened after the airtight valve is opened. When the char transport is stopped, the airtight valve is closed after the sluice valve is closed. The reason why the airtight valve is closed before the opening/closing operation of the sluice valve is that if powder such as char flows around the airtight valve during the operation of the airtight valve, the sealing portion of the airtight valve deteriorates. By opening and closing the airtight valve while the sluice valve is closed and the transfer of char is stopped, the char is prevented from flowing around the airtight valve during the operation of the airtight valve.

  Note that Patent Documents 1 and 2 disclose examples of a char recovery device. In Patent Document 1, a plurality of air chambers connected to the inside of an inclined portion corresponding to a chute pipe, and a flow rate control valve capable of changing the supply amount of assist gas that fluidizes the char of the inclined portion for each air chamber. An assist gas supply unit including is disclosed. In Patent Document 2, it is determined whether or not char is accumulated based on the pressure difference between the upper and lower portions of a stand pipe that connects a char bin and a slider pipe corresponding to a chute pipe, and it is determined that char is accumulated. In that case, a technique is disclosed in which the amount of assist gas supplied is increased toward the wind chamber closer to the stand pipe.

JP, 2013-170185, A JP, 2005-120806, A

  In the prior art, the sluice valve is provided in the flow path that connects the charbin and the chute pipe, but the cost of the sluice valve itself occurs. Also, if there is a case where the sluice valve malfunctions and the sluice valve does not move, the system in which the sluice valve is installed may stop, which may cause a decrease in the reliability of the powder transfer device. Therefore, it is expected that the system without a sluice valve will improve reliability.

  As for the chute pipe, it is necessary to provide a slanting angle of the chute pipe with respect to the horizontal plane at an angle of repose or more for smooth conveyance. It is easy to increase the cost of the vertical installation) and the installation stand. Therefore, it is expected that the inclination angle of the chute pipe is reduced to save space in the height direction.

  An object of the present invention is to provide a powder carrying device, a char collecting device, a powder carrying method, and a gasification combined cycle power generation facility that can improve reliability and reduce cost by downsizing and simplification.

  The present invention relates to a chute pipe having a carrier flow path in which powder can be deposited and at least a part of which is inclined from a horizontal surface at a predetermined inclination angle, and an assist gas for fluidizing the powder. And a transfer state in which the powder is transferred in the transfer channel by switching between an assist gas supply hole that can be supplied to the transfer surface from a vertically lower side and the supply and stop of the supply of the assist gas. An assist gas supply device that switches between a closed state in which a passage is closed by the powder, and a powder conveying device.

  According to the present invention, the powder deposited on the transport surface is fluidized by supplying the assist gas to the transport surface from the assist gas supply hole. The fluidized powder is transported so as to slide down the transport flow path by the action of gravity. When the supply of the assist gas from the assist gas supply hole is stopped, the fluidization of the powder is stopped, and the powder is deposited on the transfer surface and blocks the transfer channel. Therefore, even if the sluice valve is not provided, the supply of the assist gas is stopped to close the transfer passage, and the transfer of the powder is blocked. Since there is no need to install a sluice valve, the risk of malfunction of the sluice valve is eliminated, and the reliability of the powder transfer device is improved. Further, since it is not necessary to install a gate valve, the structure of the powder conveying device is simplified and the cost is reduced. In addition, the inclination angle of the transfer surface is set to a small angle at which the powder is deposited on the transfer surface when the supply of the assist gas is stopped, so that the powder transfer device is prevented from becoming large (longitudinal). To be done.

  In the present invention, the inclination angle is preferably 10° or more, which is less than or equal to the repose angle of the powder.

  Thus, when the supply of the assist gas is stopped, the powder is deposited on the transfer surface without sliding down on the transfer surface, and the transfer channel can be closed. For example, when the angle of repose of the powder is 40[°] or more and 50[°] or less, the inclination angle of the conveying surface is preferably 10[°] or more and the angle of repose or less. When the inclination angle of the transfer surface is smaller than 10[°], the supply amount of the assist gas necessary for fluidizing and transferring the powder becomes excessive. On the other hand, when the inclination angle of the transport surface is larger than the repose angle of the powder, the powder has a high probability of sliding down the transport surface, which makes it difficult to close the transport flow path. The inclination angle of the transfer surface is preferably 10[°] or more and the angle of repose or less, and more preferably 20[°] or more and 30[°] or less so that the supply amount of the assist gas is reduced and the transfer channel is closed. preferable.

  In the present invention, the downstream side pipe to which the powder supplied from the chute pipe is conveyed, an airtight valve provided in the downstream side pipe, and it is determined whether the transfer passage is in the closed state. It is preferable to include a determination unit and a first control unit that outputs a first control signal for closing the airtight valve after the determination unit determines that the closed state is established.

  When the transfer channel is closed, the powder is not transferred to the airtight valve and does not flow around the airtight valve. During the closing operation of the airtight valve by closing the airtight valve after it is determined by the determination unit that the transfer flow path is closed, that is, after the powder is determined not to flow around the airtight valve. Since the powder does not flow around the airtight valve, deterioration of the sealing portion of the airtight valve is suppressed.

  In the present invention, the upstream pipe to which the powder supplied to the chute pipe is conveyed, the pressure of the first portion of the internal flow passage of the upstream pipe, and the second portion upstream of the first portion. A differential pressure detector that detects a difference from the pressure of No. 1, and the determination unit may determine whether or not the closed state is established based on a detection result of the differential pressure detector.

  When the chute pipe is blocked by the powder, the powder is deposited on the lower portion of the upstream pipe as the chute pipe is blocked, and the upstream pipe is also blocked. When the powder is deposited on the first portion, which is the lower portion of the upstream pipe, a pressure difference is generated between the first portion and the second portion. Therefore, when the determination unit determines that the differential pressure between the first portion and the second portion is equal to or greater than the preset differential pressure threshold value based on the detection result of the differential pressure detector, the determination unit is in the closed state. When it is determined that the differential pressure between the first portion and the second portion is smaller than a preset differential pressure threshold value, it can be determined that the transport state is in effect.

  In the present invention, it is preferable that a second control unit that outputs a second control signal for opening the airtight valve is provided, and the assist gas supply device starts the supply of the assist gas after the airtight valve is opened.

  As a result, the supply of the assist gas is started after the opening operation of the airtight valve is completed, and the transfer of the powder is started. Since the powder does not flow around the airtight valve during the opening operation of the airtight valve, deterioration of the sealing portion of the airtight valve is suppressed.

  In the present invention, a plurality of the assist gas supply holes are provided in the carrying direction of the powder, and the assist gas supply device has a plurality of air chambers provided in the carrying direction and connected to the assist gas supply holes. , After the start of the supply of the assist gas from the assist gas supply hole connected to the air chamber closest to the upstream upper end of the chute pipe of the plurality of wind chambers, another wind after a predetermined time It is preferable that the supply of the assist gas from the assist gas supply hole connected to the chamber be started.

  When powder is supplied from the upstream side pipe to the chute pipe and accumulated, the weight of the powder accumulated on the upstream side pipe causes the chute pipe to be connected to the upstream side pipe among the powder accumulated on the chute pipe. The powder accumulated near the upper end becomes the most difficult to flow. When multiple air chambers are provided in the powder conveying direction, connect the timing of assist gas supply from the assist gas supply hole that is connected to the air chamber closest to the upper end of the chute pipe to another air chamber. By advancing the timing of supplying the assist gas from the assist gas supply hole that is generated, the chute pipe is blocked after fluidizing the powder that is hard to fluidize accumulated near the upper end of the chute pipe. The entire powder can be fluidized. As a result, the fluidization of the powder that blocks the transfer passage is efficiently performed, and the chute pipe can be switched from the closed state to the transfer state.

  In the present invention, the flow velocity of the assist gas supplied from the assist gas supply hole connected to the air chamber closest to the upper end of the chute pipe among the plurality of air chambers ejected from the transfer surface is It is preferable that the flow velocity of the assist gas supplied from the assist gas supply hole connected to the wind chamber is higher than the flow velocity of the assist gas ejected from the transfer surface.

  When a plurality of air chambers are provided in the powder conveying direction, the flow velocity of the assist gas supplied from the assist gas supply hole connected to the air chamber closest to the upper end of the chute pipe is increased to increase the speed of the chute pipe. It is possible to fluidize the powder which is hard to fluidize and is deposited near the upper end portion of, and then to fluidize the entire powder deposited in the chute pipe. As a result, the fluidization of the powder blocking the transfer passage is efficiently performed. Further, by increasing the flow velocity of the assist gas supplied from the assist gas supply hole connected to the wind chamber closest to the upper end of the chute pipe, the assist gas is supplied from the assist gas supply hole connected to another wind chamber. Even if the flow rate of the assist gas is suppressed, the blocked state of the transfer passage can be released. By suppressing the flow rate of the assist gas, the consumption amount of the assist gas is reduced and the operating cost is suppressed. Further, since the flow velocity of the assist gas is suppressed, the deterioration of the powder transportability due to the pressure increase or the pressure reversal of the transfer passage is suppressed.

  In the present invention, the transport surface includes a surface of a perforated plate, the assist gas supply hole includes a hole of the perforated plate, and the assist gas supplied from the assist gas supply device passes through the hole of the perforated plate. It is preferably supplied.

  As a result, the assist gas is uniformly supplied from the numerous holes of the porous plate between the surface of the porous plate and the powder deposited on the surface of the porous plate, the internal resistance of the powder is reduced, and the porous plate is Since the frictional resistance between the powder moving on the surface of and the surface of the perforated plate is reduced, the transport of the powder is promoted.

  In the present invention, it is preferable that a purge gas supply port for supplying a purge gas is provided on the transfer surface of the transfer passage whose closed state is not released by the supply of the assist gas from the assist gas supply hole.

  As a result, when the assist gas is supplied from the assist gas supply hole, the purge gas supply port is moved from the outside of the transfer surface to the transfer surface even if the fluidization of the powder is insufficient and the transfer channel is not closed. The closed state of the transfer channel is released by supplying the purge gas to the. The flow velocity of the purge gas is sufficiently higher than the flow velocity of the assist gas, and even if the powder is not fluidized by the supply of the assist gas, the force of the purge gas can fluidize the powder and release the closed state by the force of the purge gas. it can.

  In the present invention, the transport surface includes a first transport surface that is inclined at a first angle with respect to a horizontal plane, and a second transport surface that forms an angle with the horizontal plane that is smaller than the first angle. It is preferable that the surface is located at an upper end portion on the upstream side of the transport surface.

  By providing the second transport surface whose angle formed with the horizontal plane is smaller than that of the first transport surface, the powder easily deposits on the second deposition surface. Therefore, by stopping the supply of the assist gas, the powder can be more reliably deposited on the transfer surface, and the transfer channel can be closed.

  In the present invention, the distance between the downstream end of the transfer flow path of the second transfer surface and the boundary between the second transfer surface and the first transfer surface is longer than 0 [mm] and 1000 [mm]. mm] or less.

  When the distance between the downstream end of the transfer passage of the second transfer surface and the boundary between the second transfer surface and the first transfer surface exceeds 1000 [mm], the assist gas supplied to the second transfer surface causes The reference flow velocity ratio needs to greatly exceed 6, the supply flow rate of the purge gas increases, and the consumption amount of the assist gas increases. By setting the distance to 1000 [mm] or less, an increase in the consumption amount of assist gas is suppressed.

  The present invention comprises a charbin for storing char, a char supply hopper for accommodating the char from the charbin, and the powder transfer device for transferring the char from the charbin to the char supply hopper. A characteristic char recovery device is provided.

  According to the present invention, since it is not necessary to install a sluice valve, the risk of malfunction of the sluice valve is eliminated and the reliability of the char recovery device is improved. Further, since it is not necessary to install a gate valve, the structure of the char recovery device is simplified and the cost is reduced. In addition, the inclination angle of the transportation name is set to a small angle such that the powder is deposited on the transportation surface when the supply of the assist gas is stopped, so that the char recovery device is prevented from being upsized.

  The present invention switches between supplying and stopping the supply of the assist gas to a conveying surface provided in a conveying passage of a chute pipe, in which powder can be deposited, and at least a portion of which is inclined from a horizontal plane at a predetermined inclination angle. An upstream side in which the powder supplied to the chute pipe is transferred by switching between a transfer state in which the powder is transferred in the transfer channel and a closed state in which the transfer channel is blocked by the powder Provided is a powder carrying method characterized in that a sluice valve is not provided in a pipe.

  According to the present invention, since it is not necessary to install a gate valve, there is no risk of malfunction of the gate valve and reliability is improved. Further, the cost is reduced because it is not necessary to install a gate valve.

  The present invention is a coal gasification furnace that gasifies pulverized coal to produce a combustible product gas, the above-mentioned char recovery device, and a gas that produces a fuel gas by purifying the product gas from which the char has been recovered. Refining equipment, gas turbine equipment that burns at least part of the fuel gas to drive the turbine to rotate, exhaust heat recovery boiler into which turbine exhaust gas from the gas turbine equipment is introduced, and exhaust heat recovery boiler There is provided a gasification combined cycle power generation facility, comprising: a steam turbine facility that rotationally drives a turbine by the generated steam; and a generator connected to at least one of the gas turbine facility and the steam turbine facility.

  According to the present invention, it is possible to provide a gasification combined cycle power generation facility that can improve reliability and reduce cost by downsizing and simplification.

  According to the present invention, there are provided a powder carrying device, a char collecting device, a powder carrying method, and a gasification combined cycle power generation facility which can improve reliability and can reduce cost by downsizing and simplification.

FIG. 1 is a schematic diagram showing an example of an integrated coal gasification combined cycle power generation facility including a char recovery device according to the first embodiment. FIG. 2 is a diagram showing a main part of a char recovery device including the powder carrying device according to the first embodiment. FIG. 3 is a functional block diagram showing an example of a control device of the powder carrying device according to the first embodiment. FIG. 4 is a diagram showing the relationship between the flow rate of the assist gas and the char transport speed per cross-sectional area. FIG. 5 is a flowchart showing an example of the operation of the powder carrying device according to the first embodiment. FIG. 6 is a flowchart showing an example of the operation of the powder carrying device according to the first embodiment. FIG. 7 is a timing chart in the operation of switching from the closed state to the transport state according to the second embodiment. FIG. 8 is a diagram showing the flow rate of the assist gas flowing through the flow rate control valve according to the second embodiment per unit time. FIG. 9 is a diagram showing the relationship between the flow rate of assist gas and the char transport speed according to the second embodiment. FIG. 10 is a diagram showing an example of the powder carrying device according to the third embodiment.

  Hereinafter, embodiments according to the present invention will be described with reference to the drawings, but the present invention is not limited thereto. The constituent elements of the respective embodiments described below can be appropriately combined. In addition, some components may not be used.

<First Embodiment>
The first embodiment will be described. FIG. 1 is a schematic diagram showing an example of an integrated coal gasification combined cycle facility 10 including a char recovery device 50 according to the present embodiment. As shown in FIG. 1, the coal gasification combined cycle power generation facility (gasification combined power generation facility) 10 gasifies pulverized coal supply equipment 30 for supplying pulverized coal Pc and pulverized coal Pc supplied from the pulverized coal supply equipment 30. Coal gasification furnace 14 that converts into a combustible product gas Ga, a char recovery device 50 that recovers the char Ch contained in the product gas Ga, and a product gas Gb in which the char Ch is recovered is purified to produce a fuel gas. A gas purification facility 16 for generating Gc, a gas turbine facility 17 for burning at least a part of the fuel gas Gc to drive the turbine 63 to rotate, and an exhaust heat recovery boiler to which turbine exhaust gas Gd from the gas turbine facility 17 is introduced. 20, a steam turbine facility 18 that rotationally drives the turbine 69 with the steam Ge generated in the exhaust heat recovery boiler 20, and a generator 19 connected to at least one of the gas turbine facility 17 and the steam turbine facility 18.

  The pulverized coal supply facility 30 supplies pulverized coal Pc generated by pulverizing coal, which is a carbon-containing solid fuel, to the coal gasification furnace 14. The pulverized coal supply facility 30 has a pulverized coal bunker 32 that accommodates the pulverized coal Pc. The pulverized coal Pc is supplied from the pulverized coal bunker 32 through the pulverized coal supply line 35 to the coal gasification furnace 14 by the nitrogen gas as the transport inert gas supplied from the air separation device 42. The inert gas is an inert gas having an oxygen content of about 5% by volume or less, and is a typical example of nitrogen gas, carbon dioxide gas, argon gas, etc., but is not necessarily limited to about 5% or less. Absent.

The coal gasifier 14 gasifies the pulverized coal Pc supplied from the pulverized coal bunker 32. The coal gasification furnace 14 has a foreign matter removing device 48 for removing foreign matter such as molten slag mixed in the pulverized coal Pc. The coal gasification furnace 14 is connected to the air separation device 42 via a nitrogen supply line 43 and an oxygen supply line 47. The air separation device 42 separates the air Gg into nitrogen (N ₂ ) and oxygen (O ₂ ). The nitrogen and oxygen generated by the air separation device 42 are supplied to the coal gasification furnace 14 via the nitrogen supply line 43 and the oxygen supply line 47. Nitrogen is used as an inert gas for conveying pulverized coal Pc and char Ch. Oxygen is used as an oxidant.

  The coal gasification furnace 14 is connected to the char recovery device 50 via a generated gas supply line 49. The generated gas Ga containing the char Ch is supplied from the coal gasification furnace 14 to the char recovery device 50 via the generated gas supply line 49.

  The char recovery device 50 includes a separator 51 for separating the char Ch from the produced gas Ga, a char bin 52 for storing the char Ch separated by the separator 51, and a char supply hopper for accommodating the char Ch supplied from the char bin 52. 53 and the powder carrying device 100 for carrying the char Ch.

  The separator 51 removes the char Ch from the generated gas Ga to generate the generated gas Gb. The separation device 51 is connected to the gas purification facility 16 via the gas discharge line 15. The produced gas Gb from which the char Ch has been removed in the separation device 51 is supplied to the gas purification facility 16 via the gas discharge line 15. The separation device 51 includes a cyclone 51A that collects coarse-grained char Ch and a filter 51B that collects fine-grained char Ch. The generated gas Ga from which the coarse-grained char Ch has been removed by the cyclone 51A is supplied to the filter 51B via the gas discharge line 15A. The produced gas Gb from which the fine particles Ch have been removed by the filter 51B is supplied to the gas purification facility 16 via the gas discharge line 15B. The gas exhaust line 15A and the charbin 52 are connected via a pressure equalizing line 13 for equalizing the pressure of the gas exhaust line 15A and the pressure of the charbin 52.

  The powder transfer device 100 includes a char transfer line La that transfers the char Ch from the separating device 51 to the char bin 52, a char transfer line Lb that transfers the char Ch from the char bin 52 to the char supply hopper 53, and a char transfer line from the char supply hopper 53. The return line 46 includes a char transport line Lc that transports the char Ch. The char recovery device 50 is connected to the coal gasification furnace 14 via a char return line 46. The char return line 46 is connected to the nitrogen supply line 45. In the present embodiment, the char supply hopper 53 includes a plurality of char supply hoppers 53A, 53B, 53C.

  The char transport line La includes a char transport line La1 that transports the char Ch discharged from the cyclone 51A to the charbin 52, and a char transport line La2 that transports the char Ch discharged from the filter 51B to the charbin 52.

  The char transfer line Lb includes a char transfer line Lb1 that transfers the char Ch from the charbin 52 to the char supply hopper 53A, a char transfer line Lb2 that transfers the char Ch from the charbin 52 to the char supply hopper 53B, and a char supply hopper from the charbin 52. 53C includes a char transport line Lb3 that transports the char Ch.

  The char transport line Lc includes a char transport line Lc1 connecting the char supply hopper 53A and the char return line 46, a char transport line Lc2 connecting the char supply hopper 53B and the char return line 46, a char supply hopper 53C and a char return line. And a char transport line Lc3 connecting 46. The char Ch of the char supply hopper 53 is supplied to the coal gasification furnace 14 via the char transport line Lc and the char return line 46.

  The char supply hopper 53 that conveys the char Ch from the char bin 52 can be switched depending on the amount of accumulated char in the char supply hopper 53 and the char conveyance state. For example, when the char Ch is conveyed from the char bin 52 to the char supply hopper 53A, the char Ch is not conveyed to the char supply hoppers 53B and 53C. When the char Ch is conveyed from the char bin 52 to the char supply hopper 53B, the char Ch is not conveyed to the char supply hoppers 53A and 53C. When the char Ch is conveyed from the char bin 52 to the char supply hopper 53C, the char Ch is not conveyed to the char supply hoppers 53A and 53B. By switching the char transport lines Lb1, Lb2, Lb3 to be used, the char supply hoppers 53A, 53B, 53C to which the char Ch is supplied are sequentially switched.

  A pressure equalizing line (not shown in FIG. 1) for equalizing the pressure of the charbin 52 and the pressure of the char feeding hopper 53 is provided between the charbin 52 and each of the plurality of char feeding hoppers 53. ing. A switching valve (not shown in FIG. 1) is provided in each of the pressure equalizing lines. For example, when the char Ch is supplied from the char supply hopper 53A to the coal gasification furnace 14, the switching valve of the pressure equalization line connected to the char supply hopper 53A is closed and the inside of the char supply hopper 53A is pressurized. .. When the supply of the char Ch from the char supply hopper 53A to the coal gasification furnace 14 is completed and the char Ch is supplied from the char bin 52 to the char supply hopper 53A, the pressure equalization line connected to the char supply hopper 53A is switched. The valve is opened and the inside of the char supply hopper 53A is depressurized. The same applies to the char feeding hoppers 53B and 53C.

  The gas refining facility 16 removes impurities such as sulfur compounds and nitrogen compounds from the produced gas Gb from which the char Ch has been removed, and purifies the produced gas Gb to produce the fuel gas Gc. The fuel gas Gc is supplied to the gas turbine equipment 17 via the fuel gas supply line 66.

  The gas turbine facility 17 includes a compressor 61, a combustor 62, a turbine 63, and a rotating shaft 64 that connects the compressor 61 and the turbine 63. The combustor 62 is connected to the compressor 61 via a compressed air supply line 65, is connected to the gas purification facility 16 via a fuel gas supply line 66, and is connected to the turbine 63 via a combustion gas supply line 67. ..

  A booster 68 is provided in the compressed air supply line 41 that connects the compressor 61 of the gas turbine facility 17 and the coal gasification furnace 14. The air Gg is supplied to the compressor 61 and is supplied to the combustor 62 as compressed air Gf. The combustor 62 mixes the compressed air Gf supplied from the compressor 61 and the fuel gas Gc supplied from the gas purification facility 16 and burns them to generate a combustion gas Gh. The turbine 63 rotates the rotating shaft 64 by the combustion gas Gh to rotate the generator 19.

  The steam turbine facility 18 has a turbine 69 connected to the rotating shaft 64 of the gas turbine facility 17. The exhaust heat recovery boiler 20 is connected to the turbine 63 of the gas turbine equipment 17 via the exhaust gas line 70 and exchanges heat between air and the high temperature turbine exhaust gas Gd to generate steam Ge. The exhaust heat recovery boiler 20 is connected to the turbine 69 of the steam turbine facility 18 via a steam supply line 71 and supplies the steam Ge to the steam turbine facility 18. Further, the exhaust heat recovery boiler 20 is connected to the steam recovery line 72. The steam recovery line 72 is provided with a condenser 73. The turbine 69 rotates the rotating shaft 64 by the steam Ge supplied from the exhaust heat recovery boiler 20 to rotate the generator 19.

  The exhaust gas Gi whose heat has been recovered by the exhaust heat recovery boiler 20 is supplied to the gas purification device 74. The gas purification device 74 removes harmful substances from the exhaust gas Gi. The exhaust gas Gj purified by the gas purification device 74 is emitted from the chimney 75.

  FIG. 2 is a diagram showing a main part of a char recovery device 50 including the powder carrying device 100 according to the present embodiment. As shown in FIG. 2, the char recovery unit 50 conveys the char Ch from the char bin 52 that stores the char Ch, the char supply hopper 53 that stores the char Ch from the char bin 52, and the char supply hopper 53 to the char supply hopper 53. The powder carrying device 100 and the control device 200 are provided.

  FIG. 2 shows the char transport line Lb and the char supply hopper 53 of one system among the plurality of char transport lines Lb and the char supply hopper 53. Since the char transport line Lb and the char supply hopper 53 of the other systems have the same structure and function, description thereof will be omitted. Further, in the following description, the char transport line Lb of the powder transport apparatus 100 that transports the char Ch from the char bin 52 to the char supply hopper 53 will be mainly described.

  The powder conveying device 100 includes a chute pipe 101 having a conveying flow passage 101R for conveying the char Ch as powder and an upstream pipe having a conveying passage 102R for conveying the char Ch supplied to the chute pipe 101. 102 and a downstream side pipe 103 having a transfer channel 103R through which the char Ch supplied from the chute pipe 101 is transferred.

  The chute pipe 101 is inclined at a predetermined inclination angle θ with respect to the horizontal plane. Each of the upstream pipe 102 and the downstream pipe 103 extends in the vertical direction. The upstream pipe 102 connects the lower end of the charbin 52 and the upper end of the chute pipe 101 in the vertical direction. The downstream side pipe 103 connects the lower end of the chute pipe 101 in the vertical direction and the upper end of the char supply hopper 53.

  The transfer channel 101R of the chute pipe 101 is provided with a transfer surface 104 that can contact the char Ch and that is inclined at a predetermined inclination angle θ with respect to the horizontal plane. The transport surface 104 is inclined downward toward the front in the transport direction of the char Ch. The char Ch is conveyed in the longitudinal direction of the chute pipe 101. The char Ch can be deposited on the transport surface 104. The predetermined inclination angle θ of the transport surface 104 with respect to the horizontal plane is set to be equal to or less than the repose angle of the char Ch. An example of the angle of repose in a general char and a general chute piping may be 45[°] or more and 50[°] or less.

  Further, in the powder carrying device 100, an assist gas supply hole capable of supplying the assist gas Gr for fluidizing the char Ch from the vertically lower side to the carrying surface 104 (toward the carrying passage 101R side of the porous plate 120). 105 and an assist gas supply device 106 capable of switching between supply and stop of supply of the assist gas Gr from the assist gas supply hole 105.

  The assist gas supply device 106 supplies the assist gas Gr to the transfer passage 101R which is an internal passage of the chute pipe 101. As the assist gas Gr, nitrogen gas, carbon dioxide gas, an inert gas (inert gas) having an oxygen concentration of about 5% by volume or less, and the like are used. The assist gas supply device 106 has a wind chamber 107 connected to the assist gas supply hole 105. The wind chamber 107 is provided inside the wind chamber member 108 fixed to the lower portion of the chute pipe 101. The wind chamber 107 is provided below the chute pipe 101, and is connected to the transfer passage 101R of the chute pipe 101. The assist gas supply device 106 supplies the assist gas Gr to the transfer passage 101R of the chute pipe 101 via the wind chamber 107.

  A plurality of wind chambers 107 are provided in the char Ch transport direction. A plurality of wind chambers 107 are provided by partitioning the inside of the wind chamber member 108 with a partition plate. In the present embodiment, the wind chamber 107 includes a wind chamber 107A closest to the upper end of the chute pipe 101 in the vertical direction, a wind chamber 107B closest to the wind chamber 107A next to the upper end of the chute pipe 101, and next to the wind chamber 107B. It includes a wind chamber 107C that is close to the upper end of the chute pipe 101 and a wind chamber 107D that is closest to the lower end of the chute pipe 101.

  Further, the assist gas supply device 106 includes a gas supply pipe 110 that connects an assist gas supply source (not shown) and the wind chamber 107. The gas supply pipe 110 has a main pipe 109 connected to an assist gas supply source, and branch pipes 110A, 110B, 110C, 110D branched from the main pipe 109. The main pipe 109 is provided with a shutoff valve 111 and a check valve 112.

  The plurality of branch pipes 110A, 110B, 110C and 110D are connected to the plurality of wind chambers 107A, 107B, 107C and 107D, respectively. The assist gas Gr supplied from the assist gas supply source is supplied to the plurality of wind chambers 107A, 107B, 107C, 107D via the plurality of branch pipes 110A, 110B, 110C, 110D.

  Each of the branch pipes 110A, 110B, 110C, 110D is provided with a flow rate adjusting valve 114A, 114B, 114C, 114D capable of adjusting the supply amount of the assist gas Gr. The control device 200 can control the flow rate adjusting valves 114A, 114B, 114C, 114D to adjust the supply amount of the assist gas Gr supplied to the plurality of air chambers 107A, 107B, 107C, 107D. The flow rate adjusting valves 114A, 114B, 114C, 114D may be manual valves and may be manually operated.

  In this embodiment, the perforated plate 120 is arranged in the transfer passage 101R of the chute pipe 101. The transport surface 104 is the surface of the porous plate 120, and the assist gas supply holes 105 are the holes of the porous plate 120. A plurality of assist gas supply holes 105 are provided in the char Ch transport direction. Each of the plurality of air chambers 107A, 107B, 107C, 107D is connected to the assist gas supply hole 105. The assist gas Gr supplied from the assist gas supply source to the plurality of air chambers 107A, 107B, 107C, 107D is supplied to the transfer surface 104 via the assist gas supply hole 105.

  In addition, the porous plate 120 is preferably a porous body (porous medium) such as a sintered metal or a sintered wire mesh in which a large number of gas passages of fine pores exist. As a result, the char Ch of the transport passage 101R is prevented from flowing into the wind chamber 107.

  The assist gas supply device 106 switches between a state in which the assist gas Gr is supplied from the assist gas supply hole 105 and a state in which the supply of the assist gas Gr is stopped, and the char Ch is transported in the transport passage 101R of the chute pipe 101. The transport state and the transport channel 101R are switched between the closed state in which they are blocked by the char Ch. As described above, the predetermined inclination angle θ of the transport surface 104 is set to be equal to or less than the repose angle of the char Ch. In order to bring the transfer channel 101R into the closed state in which it is closed by the char Ch, the chute piping is provided from the charbin 52 via the upstream piping 102 while the supply of the assist gas Gr from the assist gas supply hole 105 is stopped. When the char Ch is supplied to 101, the char Ch is deposited on the transport surface 104. When the supply of the char Ch is continued, the accumulated amount of the char Ch increases, the transfer channel 101R is closed by the char Ch, and the airtight valve 130 of the downstream pipe 103 is closed. Next, the airtight valve 130 of the downstream pipe 103 is opened to bring the char Ch into the carrying state. Here, when the assist gas Gr is supplied from the assist gas supply hole 105, the char Ch deposited on the transport surface 104 is fluidized by the assist gas Gr. When the char Ch flows, the internal friction of the char Ch is reduced, and the frictional resistance between the char Ch and the transport surface 104 is reduced, the char Ch moves so as to slide down on the transport surface 104 by the action of gravity and transports the char Ch. The conveyance state is established in the flow path 101R. The char Ch in the conveyed state is supplied to the char supply hopper 53.

  An airtight valve 130 is provided in the downstream pipe 103. The airtight valve 130 shuts off the transfer passage 103R, which is an internal passage of the downstream pipe 103, to restrict the supply of the char Ch to the char supply hopper 53.

  In the upstream pipe 102, the difference between the pressure of the first portion 102a of the transfer passage 102R, which is the internal passage of the upstream pipe 102, and the pressure of the second portion 102b upstream of the first portion 102a is detected. A differential pressure detector 140 is provided. The first portion 102a is the lower portion of the transfer passage 102R, and the second portion 102b is the upper portion of the transfer passage 102R. Preferably, the first portion 102a is near the connecting portion between the charbin 52 and the upstream pipe 102, and the second portion 102b is near the connecting portion between the upstream pipe 102 and the chute pipe 101.

  Further, the powder carrying device 100 is provided with a purge gas supply port 150 for supplying a purge gas from the outside of the carrying surface 104 to the carrying surface 104. The purge gas supply port 150 is provided at the tip of the nozzle member, and the nozzle member is connected to the purge gas injection device 151. The purge gas supply port 150 injects the purge gas supplied from the purge gas injection device 151 onto the transport surface 104. The purge gas supply port 150 injects the purge gas from the upstream end of the transfer surface 104 toward the downstream side of the transfer surface 104. The purge gas injection device 151 intermittently injects the purge gas from the purge gas supply port 150. As the purge gas, nitrogen gas, carbon dioxide gas, and an inert gas (inert gas) having an oxygen concentration of about 5 [volume%] or less are used.

  The charbin 52 and the char supply hopper 53 are connected via a pressure equalizing line 160 for equalizing the pressure of the charbin 52 and the pressure of the char supply hopper 53. A switching valve 161 is provided in the pressure equalizing line 160. When supplying the char Ch from the char supply hopper 53 to the coal gasification furnace 14, the switching valve 161 is closed and the pressure inside the char supply hopper 53 is increased. When the char Ch is supplied from the char supply hopper 53 to the coal gasification furnace 14 and the char Ch is supplied from the char bin 52 to the char supply hopper 53, the switching valve 161 is opened and the inside of the char supply hopper 53 is depressurized. To be done.

  FIG. 3 is a functional block diagram showing an example of the control device 200 of the powder carrying device 100 according to the present embodiment. The control device 200 includes a computer system. The control device 200 controls the input/output unit 201, the determination unit 202 that determines whether the transfer channel 101R of the chute pipe 101 is closed by the char Ch, and the flow rate adjustment valves 114A, 114B, 114C, and 114D. An assist gas control unit 203 that outputs a signal, an airtight valve control unit 204 that outputs a control signal that controls the airtight valve 130, a purge gas control unit 205 that outputs a control signal that controls the purge gas injection device 151, and a pressure equalizing line. A switching valve control unit 206 that outputs a control signal for controlling the switching valve 161 of 160.

  The determination unit 202 determines whether or not the transfer channel 101R of the chute pipe 101 is blocked by the char Ch based on the detection result of the differential pressure detector 140. When the transfer channel 101R of the chute pipe 101 is blocked by the char Ch, the char Ch is accumulated on the first portion 102a which is the lower part of the transfer channel 102R of the upstream pipe 102 due to the blockage of the transfer channel 101R. To do. When the char Ch is deposited on the first portion 102a of the transfer passage 102R, a pressure difference is generated between the first portion 102a and the second portion 102b. When the determination unit 202 determines that the differential pressure between the first portion 102a and the second portion 102b is equal to or greater than the preset differential pressure threshold value based on the detection result of the differential pressure detector 140, the upstream side It is determined that the char Ch is accumulated on the first portion 102a of the transfer passage 102R of the pipe 102, and the transfer passage 101R of the chute pipe 101 is determined to be blocked by the char Ch. On the other hand, when the determination unit 202 determines that the differential pressure between the first portion 102a and the second portion 102b is smaller than the preset differential pressure threshold, the transfer passage 101R of the chute pipe 101 is in the closed state. However, the char Ch determines that the transfer passage 101R of the chute pipe 101 is in the transfer state.

  The assist gas control unit 203 outputs a control signal for opening the flow rate adjusting valves 114A, 114B, 114C, 114D when the char Ch is brought into the carrying state in the carrying passage 101R of the chute pipe 101. The assist gas control unit 203 outputs a control signal for closing the flow rate adjusting valves 114A, 114B, 114C, 114D when the transfer channel 101R of the chute pipe 101 is closed by the char Ch.

  The airtight valve control unit 204 includes a first control unit 204A that outputs a first control signal that closes the airtight valve 130 after the determination unit 202 determines that the transfer passage 101R of the chute pipe 101 is in the closed state, and an airtight valve. And a second control unit 204B that outputs a second control signal for opening 130. The assist gas control unit 203 outputs a control signal for opening the flow rate adjusting valves 114A, 114B, 114C, 114D after the airtight valve 130 is opened.

  After the control signal for opening the flow rate adjusting valves 114A, 114B, 114C, 114D is output from the assist gas control unit 203 and the assist gas Gr is supplied from the assist gas supply hole 105, the purge gas control unit 205 detects the differential pressure. When it is determined that the closed state of the transfer passage 101R of the chute pipe 101 is not released based on the detection result of the container 140, a control signal is sent to the purge gas injection device 151 so that the purge gas is injected from the purge gas supply port 150. Output.

  The switching valve control unit 206 outputs a control signal for opening the switching valve 161 and a control signal for closing the switching valve 161.

  Next, the predetermined inclination angle θ of the transport surface 104 will be described. For example, when the angle of repose of the char Ch is 40 [°] or more and 50 [°] or less, the inclination angle θ of the transport surface 104 is preferably 10 [°] or more and the angle of repose or less. When the predetermined inclination angle θ of the transfer surface 104 is smaller than 10[°], as shown in FIG. 4 described later, the assist gas Gr having an excessive supply amount or flow rate for fluidizing and transferring the char Ch is supplied. It becomes inefficient because it becomes necessary. When the consumption amount of the assist gas Gr increases, the operating cost increases. On the other hand, when the inclination angle θ of the transport surface 104 is larger than the repose angle of the char Ch, the char Ch slides down the transport surface 104 by its own weight, which makes it difficult to close the transport channel 101R. The predetermined inclination angle θ of the transfer surface 104 is 10° or more so that the supply amount or flow rate of the assist gas Gr required to transfer the char Ch is reduced and the transfer channel 101R is closed. The angle is preferably less than or equal to the angle, and more preferably 20[°] or more and 30[°] or less.

FIG. 4 shows the flow rate ratio [− (no unit)] of the assist gas Gr supplied from the assist gas supply hole 105 and the transport speed [kg/m ² /s] of the char Ch per cross-sectional area of the char transport line Lb. It is a figure which shows the relationship of. ○ (white circle) is when the tilt angle θ is 30[°], ● (filled circle) is when the tilt angle θ is 20[°], □ (white square) ) Indicates that when the inclination angle θ is 10[°]. FIG. 4 shows the state of conveyance of the char Ch to the char supply hopper 53. As shown in FIG. 4, when the inclination angle θ is 20[°] or more and 30[°] or less, the flow rate ratio of the assist gas Gr is small (the fluidization start speed when the inclination angle θ is 30[°] is 1), it is possible to bring the char Ch into the transport state regardless of the inclination angle.

  As shown in FIG. 4, when the predetermined inclination angle θ is 20[°] or more and 30[°] or less, and the flow rate ratio of the assist gas Gr is 1[−] or more, the powder conveying apparatus 100 is practically used. The carry amount of the char Ch in the range is secured. The flow rate ratio of the assist gas Gr is preferably 2 [-] or more, and more preferably 5 [-] or more. On the other hand, when the inclination angle θ is 10[°], the flow rate ratio of the assist gas Gr needs to be 8[−] or more, preferably 10[−] or more in order to secure the transport amount of the char Ch in the practical range. Becomes Therefore, the predetermined inclination angle θ of the transport surface 104 is preferably 10[°] or more and the angle of repose or less, and more preferably 20[°] or more and 30[°] or less.

  Next, an example of the operation of the powder carrying apparatus 100 according to this embodiment will be described with reference to FIGS. 5 and 6. FIG. 5 is a flowchart showing an example of the operation of the powder carrying apparatus 100 when the carrying channel 101R of the chute pipe 101 is changed from the carrying state to the closed state. FIG. 6 is a flowchart showing an example of the operation of the powder conveying apparatus 100 when releasing the closed state of the transfer passage 101R of the chute pipe 101 to change the closed state to the transfer state.

  The operation of switching the transport flow path 101R from the transport state to the closed state will be described with reference to FIG.

  The assist gas control unit 203 outputs a control signal for closing the flow rate control valves 114A, 114B, 114C, 114D. As a result, the supply of the assist gas Gr from the assist gas supply hole 105 is stopped (step SA1).

  Char Ch is supplied from the char bin 52 to the chute pipe 101 via the upstream pipe 102 while the supply of the assist gas Gr from the assist gas supply hole 105 is stopped, whereby the transfer surface 104 of the chute pipe 101. Deposition of char Ch in the process proceeds. The inclination angle θ of the transfer surface 104 is set to a small angle such that the char Ch is deposited on the transfer surface 104 when the supply of the assist gas Gr is stopped, specifically, a repose angle of the char Ch or less. The deposition of char Ch is promoted.

  The determination unit 202 determines whether or not the transport passage 101R is in the closed state based on the detection result of the differential pressure detector 140 (step SA2).

  When it is determined in step SA2 that the transport flow path 101R is not in the closed state (step SA2: No), the determination unit 202 continues to monitor the detection result of the differential pressure detector 140.

  When it is determined in step SA2 that the transfer flow path 101R is in the closed state (step SA2: Yes), the first control unit 204A of the airtight valve control unit 204 outputs the first control signal for closing the airtight valve 130. Output. As a result, the airtight valve 130 is closed (step SA3).

  After the airtight valve 130 is closed, the switching valve control unit 206 outputs a control signal for closing the switching valve 161. As a result, the switching valve 161 is closed (step SA4).

  After the airtight valve 130 and the switching valve 161 are closed, the pressure inside the char supply hopper 53 is increased, and the char Ch of the char supply hopper 53 is supplied to the coal gasification furnace 14 (step SA5).

  Next, with reference to FIG. 6, an operation when switching the transport flow path 101R from the closed state to the transport state will be described.

  The switching valve control unit 206 outputs a control signal for opening the switching valve 161. As a result, the switching valve 161 is opened (step SB1). The inside of the char supply hopper 53 is decompressed, and the char supply hopper 53 and the char bin 52 are pressure-equalized.

  Next, the second control unit 204B of the airtight valve control unit 204 outputs a second control signal for opening the airtight valve 130. As a result, the airtight valve 130 is opened (step SB2).

  After the airtight valve 130 is opened, the assist gas control unit 203 outputs a control signal for opening the flow rate control valves 114A, 114B, 114C, 114D. As a result, the supply of the assist gas Gr from the assist gas supply hole 105 is started (step SB3).

  In the present embodiment, the plurality of flow rate adjusting valves 114A, 114B, 114C, 114D are simultaneously opened, and the assist gas Gr is simultaneously supplied to the plurality of air chambers 107A, 107B, 107C, 107D. Further, the plurality of flow rate adjusting valves 114A, 114B, 114C, 114D are opened at the same opening, and the plurality of assist gas supply holes 105 connected to the plurality of air chambers 107A, 107B, 107C, 107D are even. The assist gas Gr is supplied so as to be ejected at a flow velocity that can be regarded as the ejection amount.

  The char Ch is fluidized by supplying the assist gas Gr. In this embodiment, the transport surface 104 is the surface of the porous plate 120, and the assist gas supply holes 105 are the holes of the porous plate 120. Between the surface of the porous plate 120 and the char Ch deposited on the surface of the porous plate 120, the assist gas Gr is supplied from a large number of holes of the porous plate so as to be ejected substantially uniformly. The reference flow velocity ratio of the assist gas Gr is 1 or more and 6 or less (in FIG. 4, the fluidization start speed is 1 when the inclination angle θ is 30[°]). By supplying the assist gas Gr, the internal friction of the char Ch is reduced and the frictional resistance between the char Ch moving on the transport surface 104 and the transport surface 104 is reduced, so that the transport of the char Ch is promoted. The char Ch is transported by the action of gravity so as to slide down on the transport surface 104 and is supplied to the char supply hopper 53.

  The determination unit 202 determines, based on the detection result of the differential pressure detector 140, whether or not the closed state of the transport passage 101R has been released (step SB4).

  In step SB4, when it is determined that the closed state of the transport flow path 101R is released, that is, the char Ch is in the transport state (step SB4: Yes), the operation of switching from the blocked state to the transport state ends.

  In step SB4, it may be determined that the closed state of the transfer passage 101R has not been released, and the supply amount of the assist gas Gr may be temporarily increased as described later (in this case, although not shown, step SB3). Return to). In the present embodiment, if it is determined that the supply of the assist gas Gr does not release the closed state, assuming that the increase in the supply amount of the assist gas Gr has reached the limit, or is in a situation where the supply of the assist gas Gr does not increase (step). SB4: No), the purge gas control unit 205 outputs a control signal so that the purge gas is injected from the purge gas supply port 150. As a result, injection of purge gas is added from the purge gas supply port 150 (step SB5).

  Even if the assist gas Gr is supplied from the assist gas supply port 105, if the closed state of the transfer passage 101R is not released, the purge gas supply port 150 adds the injection of the purge gas from the outside of the transfer surface 104 to the transfer surface 104. , Char Ch is promoted to be fluidized, and the closed state of the transfer channel 101R is released. The flow rate of the purge gas injected from the purge gas supply port 150 is sufficiently higher than the flow rate of the assist gas Gr supplied from the assist gas supply port 105, and the purge gas is intermittently injected. Therefore, even if the char Ch is not fluidized by the supply of the assist gas Gr, the char is started to be fluidized by the force of the purge gas by the injection of the purge gas, and the closed state is released.

  After the purge gas is injected, it is determined based on the detection result of the differential pressure detector 140 whether or not the closed state of the transfer passage 101R is released (step SB4). The injection of the purge gas is intermittently continued until it is determined that the closed state of the transfer passage 101R is released. When it is determined that the closed state of the transfer passage 101R is released, the injection of the purge gas is stopped.

  When it is determined in step SB4 that the closed state of the transfer passage 101R is not released, the assist gas control unit 203 increases the flow rate of the assist gas Gr supplied from the assist gas supply hole 105, The flow rate adjusting valves 114A, 114B, 114C, 114D may be controlled. (In this case, although not shown, the process returns to step SB3)

  As described above, according to the present embodiment, the assist gas Gr is supplied from the assist gas supply hole 105 to the transfer surface 104, so that the char Ch in the closed state is fluidized, and the transfer channel 101R is caused by the action of gravity. It is transported so as to slide down. Next, when the transfer of the required amount of char Ch is completed, the supply of the assist gas Gr from the assist gas supply hole 105 is stopped, so that the char Ch is deposited on the transfer surface 104 and flows through the transfer channel 101R. Put in a closed state. In the prior art, a sluice valve is provided in the upstream pipe 102, and when closing or opening the airtight valve 130, the sluice valve is first provided so that the char Ch does not flow around the airtight valve 130 during the operation. The airtight valve 130 was closed after was closed. According to the present embodiment, the sluice valve provided in the upstream pipe 102 in the related art may be omitted. Even if there is no sluice valve, it is possible to set the char Ch to the carrying state and the carrying blocking state by selecting the supply and stop of the assist gas Gr. Since the installation of the sluice valve is unnecessary and the char Ch is conveyed after being fluidized, the risk of malfunction of the sluice valve is eliminated, and the reliability of the powder conveying apparatus 100 is improved. Further, since it is not necessary to install a gate valve, the structure of the powder conveying device 100 is simplified and the cost is reduced. Furthermore, since the inclination angle θ of the transfer surface 104 is set to a small angle (10° to angle of repose) that is equal to or less than the repose angle of the char Ch, upsizing of the powder transfer apparatus 100 (longitudinal length in the height direction) can be achieved. It can be suppressed and the installation stand can be simplified.

  Further, in the present embodiment, when the transport state is switched to the closed state, the airtight valve 130 is closed after the determination unit 202 determines that the transport flow path 101R is in the closed state. Since the transfer passage 101R is closed and the char Ch is not flowing around the airtight valve 130, the airtight valve 130 is closed, so that deterioration of the sealing portion of the airtight valve 130 is suppressed.

  Further, in the present embodiment, when switching from the closed state to the transfer state, the transfer of the assist gas Gr is started after the opening operation of the airtight valve 130 is completed and the char Ch is fluidized. To be done. Since the char Ch does not flow around the airtight valve 130 during the opening operation of the airtight valve 130, deterioration of the seal portion of the airtight valve 130 is suppressed.

  In the present embodiment, the determination unit 202 determines whether or not the transport passage 101R is in the closed state based on the detection result of the differential pressure detector 140. The determination unit 202 may determine whether or not the assist gas supply device 106 is in the closed state based on the elapsed time after the supply of the assist gas Gr is stopped. When the supply of the assist gas Gr is stopped, the flow of the char Ch is stopped, and the accumulation of the char Ch and the blocking of the transfer passage 101R are started. After the supply of the assist gas Gr is stopped, the accumulation of the char Ch and the closing of the transfer passage 101R are started, and the char Ch is not conveyed to the airtight valve 130 (the state where the char Ch is not flowing around the airtight valve 130). The time until it becomes) can be obtained by experiment or simulation. Therefore, the determination unit 202 can determine whether or not the closed state is achieved based on the elapsed time after the assist gas supply device 106 starts the supply stop of the assist gas Gr.

<Second Embodiment>
The second embodiment will be described. Constituent elements that are the same as or equivalent to those in the above-described embodiment are given the same reference numerals, and description thereof will be simplified or omitted.

  In the present embodiment, in the operation of switching from the closed state to the transport state, an assist gas supply hole connected to the wind chamber 107A closest to the upper end of the chute pipe 101 among the plurality of wind chambers 107A, 107B, 107C, 107D. An embodiment will be described in which after the supply of the assist gas Gr from 105 is started, the supply of the assist gas Gr from the assist gas supply holes 105 connected to the other air chambers 107B, 107C, 107D is started.

  FIG. 7 is a timing chart in the operation of switching from the closed state to the transport state. 7A shows the amount of char Ch transported in the chute pipe 101, FIG. 7B shows the opening/closing operation of the airtight valve 130, and FIG. 7C shows the flow rate adjusting valve 114A, The opening/closing operation of 114B, 114C, 114D is shown.

  As shown in FIG. 7, in the operation of switching from the closed state to the transport state, in the present embodiment, the airtight valve 130 is opened at time t1, and the flow rate adjustment valve 114A is opened at time t2 after time t1. At time t3, which is after time t2, the flow rate adjusting valves 114B, 114C, 114D are opened. The time between time t2 and time t3 is about several seconds, and is, for example, 1 [second] or more and 10 [seconds] or less.

  When the flow rate adjusting valves 114A, 114B, 114C, 114D are manual valves and are manually operated, the transfer state is switched by opening and closing the shutoff valve 111.

  Further, in the present embodiment, the flow velocity V1 of the assist gas Gr supplied from the assist gas supply hole 105 connected to the wind chamber 107A on the upstream side is different from that of the other wind chambers 107B, 107C, 107D on the downstream side. A difference is provided between the opening degree of the flow rate adjusting valve 114A and the opening degree of the flow rate adjusting valves 114B, 114C, 114D so that the flow rate V2 of the assist gas Gr supplied from the connected assist gas supply hole 105 becomes faster. Be done.

  FIG. 8 shows the flow rate of the assist gas Gr flowing through the flow rate adjusting valves 114A, 114B, 114C and 114D according to the present embodiment per unit time. In the flow rate adjusting valve 114A, the flow rate F1 of the assist gas Gr flows. In the flow rate adjusting valves 114B, 114C, 114D, the assist gas Gr having a flow rate F2 smaller than the flow rate F1 flows. When the flow rate of the assist gas Gr flowing through the flow rate adjusting valves 114A, 114B, 114C, 114D per unit time and the assist gas Gr passing through the flow rate adjusting valves 114A, 114B, 114C, 114D are supplied from the assist gas supply hole 105. There is a one-to-one correspondence with the flow velocity of. The flow rate V1 of the assist gas Gr that has passed through the flow rate adjusting valve 114A is supplied from the assist gas supply hole 105. The assist gas Gr that has passed through the flow rate adjusting valves 114B, 114C and 114D is supplied from the assist gas supply hole 105. Is faster than the flow velocity V2. In this embodiment, the flow rate F1 (flow rate V1) is set to be twice or more the flow rate F2 (flow rate V2).

  FIG. 9 is a diagram showing the relationship between the ratio (F1/F2) between the flow rate F1 and the flow rate F2 and the transport speed of the char Ch in the chute pipe 101 according to the present embodiment. As shown in FIG. 9, a difference is provided between the flow rate F1 and the flow rate F2, and by optimizing the difference, the fluidization of the char Ch is promoted, the closed state is released, and the flow rate of the assist gas Gr is changed. The conveying speed of the char Ch can be increased without increasing it more than necessary. As shown in FIG. 9, when the flow rate (flow rate F2) of the assist gas Gr that has passed through the flow rate adjusting valves 114B, 114C, 114D is selected as a flow rate that can be carried by starting fluidization in this region, that is, a reference value When the flow velocity ratio is 1 or more and 6 or less (the fluidization start speed is 1 when the inclination angle θ is 30[°] in FIG. 4), when the F1/F2 becomes 2.0 or more, the char Ch The conveyance speed of is higher than the planned value (target value), and the conveyance speed of the char Ch in the practical range is secured in the powder conveying apparatus 100. In the range where F1/F2 is 1.0 or more and less than 2.0, when the flow velocity F2 is set and the reference flow velocity ratio is close to 1, the char Ch may have an insufficient transport speed, and the required transport speed is secured. There may be an unstable area that cannot be done. If F1/F2 is less than 1.0, the char Ch is not sufficiently conveyed.

  In this situation, when the char Ch is supplied from the upstream pipe 102 to the chute pipe 101 and accumulated, the weight of the char Ch accumulated on the upstream pipe 102 causes the char Ch to accumulate on the upstream side of the char Ch accumulated on the chute pipe 101. It is considered that this is because the char Ch accumulated near the upper end of the chute pipe 101 connected to the pipe 102 becomes the most difficult to flow. As described with reference to FIG. 7, the timing of supplying the assist gas Gr from the assist gas supply hole 105 connected to the air chamber 107A closest to the upper end of the chute pipe 101 is set to the other air chambers 107B and 107C. , 107D is earlier than the timing of supplying the assist gas Gr from the assist gas supply hole 105 connected to the chute pipe 101, thereby fluidizing the char Ch that is difficult to fluidize and is accumulated near the upper end of the chute pipe 101. The entire char Ch that closes the chute pipe 101 can be fluidized.

  Further, as described with reference to FIG. 9, the flow velocity V1 of the assist gas Gr supplied from the assist gas supply hole 105 connected to the air chamber 107A closest to the upper end of the chute pipe 101 is set to the other air chamber. By making the flow rate V2 of the assist gas Gr supplied from the assist gas supply holes 105 connected to 107B, 107C, and 107D faster, a sufficient transfer speed of the char Ch is secured and the transfer of the char Ch is promoted. .. Further, by increasing the flow velocity V1 of the assist gas Gr supplied from the assist gas supply hole 105 connected to the wind chamber 107A, the assist gas supplied from the assist gas supply hole 105 connected to the wind chambers 107B, 107C and 107D is assisted. Even if the flow velocity V2 of the gas Gr is suppressed, the closed state of the transfer passage 101R can be released. Since the flow velocity V2 of the assist gas Gr can be suppressed, the consumption amount of the assist gas Gr can be reduced and the operating cost can be suppressed while ensuring the target transport speed of the char Ch. Further, since the flow velocity V2 can be suppressed, deterioration of the transportability of the char Ch due to the pressure rise or the pressure reversal of the transport passage 101R is suppressed.

<Third Embodiment>
A third embodiment will be described. Constituent elements that are the same as or equivalent to those in the above-described embodiment are assigned the same reference numerals, and the description thereof will be simplified or omitted.

  FIG. 10 is a diagram showing an example of the powder carrying device 100B according to the present embodiment. As shown in FIG. 10, in the present embodiment, the transport surface 104 has a first transport surface 104A that is inclined at a first angle θ with respect to the horizontal plane, and the horizontal angle is smaller than the first angle θ. 2 conveyance surface 104B is included.

  The first angle θ is the same as the tilt angle θ described in the above embodiment, and is preferably 10[°] or more and the angle of repose or less.

  The angle formed by the horizontal surface and the second transport surface 104B is less than 10[°], and preferably 0[°]. That is, the second transport surface 104B is preferably parallel to the horizontal plane.

  The second transport surface 104B is provided on the upstream side of the first transport surface 104A. In the present embodiment, at least a part of the second transfer surface 104B is arranged immediately below the transfer passage 102R of the upstream pipe 102. The dimension Hb is the distance between the downstream end of the transport passage 102R and the boundary between the second transport surface 104B and the first transport surface 104A. The dimension Ha is the distance between the boundary between the second transport surface 104B and the first transport surface 104A and the downstream end of the first transport surface 104A. In the present embodiment, the diameter of the transfer channel 101R is, for example, 500 [mm], and the dimension Hb is longer than 0 [mm] and 1000 [mm] or less.

  If the dimension Hb on the second transfer surface 104B exceeds 1000 [mm], the reference flow velocity ratio by the assist gas Gr supplied to the first transfer surface 104B needs to greatly exceed 6, and the purge gas from the purge gas injection device 151 Of the assist gas Gr increases, and the amount of consumption of the assist gas Gr increases.

  Since the second transport surface 104B whose angle to the horizontal plane is smaller than the first transport surface 104A is provided, the char Ch is not transported downstream due to its own weight when the assist gas Gr for fluidization is not present. The second transport surface 104B facilitates deposition. Therefore, when the supply of the assist gas Gr is stopped, the char Ch is more reliably deposited on the transfer surface 104, and the transfer channel 101R can be closed.

  In addition, in each above-mentioned embodiment, although it decided that the powder conveying apparatus 100 was applied to the coal gasification combined cycle power generation equipment 10, it may be replaced with another equipment different from the pulverized coal supply equipment or the coal gasification combined cycle power generation equipment 10. It may be applied, or powder other than char Ch may be conveyed.

10 Integrated coal gasification combined cycle facility (gasification combined cycle facility)
13 Pressure equalization line 14 Coal gasification furnace 15 (15A, 15B) Gas discharge line 16 Gas purification facility 17 Gas turbine facility 18 Steam turbine facility 19 Generator 20 Waste heat recovery boiler 30 Pulverized coal supply facility 32 Pulverized coal bunker 35 Fine powder Charcoal supply line 41 Compressed air supply line 42 Air separation device 43 Nitrogen supply line 45 Nitrogen supply line 46 Char return line 47 Oxygen supply line 48 Foreign matter removal device 49 Product gas supply line 50 Char recovery device 51 Separation device 51A Cyclone 51B Filter 52 Charbin 53 (53A, 53B, 53C) Char supply hopper 61 Compressor 62 Combustor 63 Turbine 64 Rotating shaft 65 Compressed air supply line 66 Fuel gas supply line 67 Combustion gas supply line 68 Booster 69 Turbine 70 Exhaust gas line 71 Steam supply line 72 Steam recovery line 73 Condenser 74 Gas purification device 75 Chimney 100 Powder transfer device 101 Chute piping 101R Transfer channel 102 Upstream piping 102a First portion 102b Second portion 102R Transfer channel 103 Downstream piping 103R Transfer channel 104 Transport surface 104A First transport surface 104B Second transport surface 105 Assist gas supply hole 106 Assist gas supply device 107 (107A, 107B, 107C, 107D) Wind chamber 108 Wind chamber member 109 Main pipe 110 Gas supply pipes 110A, 110B, 110C, 110D Branch pipe 111 Shutoff valve 112 Check valve 114A, 114B, 114C, 114D Flow rate control valve 120 Perforated plate 130 Airtight valve 140 Differential pressure detector 150 Purge gas supply port 151 Purge gas injection device 160 Pressure equalizing line 161 Switching valve 200 Control device 201 Input/output unit 202 Judgment unit 203 Assist gas control unit 204 Airtight valve control unit 204A First control unit 204B Second control unit 205 Purge gas control unit 206 Switching valve control unit Ch Char Ga Generated gas Gb Generated gas Gc Fuel gas Gd Turbine exhaust gas Ge vapor Gf Compressed air Gg Air Gh Combustion gas Gi Exhaust gas Gj Exhaust gas Gr Assist gas La (La1, La2) Char transport line Lb (Lb1, Lb2, Lb3) Char transport line Lc (Lc1, Lc2, Lc3) Char transport line Pc Fine powder Charcoal θ inclination angle

Claims (14)

A chute pipe having a transfer flow path in which powder can be deposited and at least a part of which is provided with a transfer surface inclined from a horizontal plane at a predetermined inclination angle,
An assist gas supply hole capable of supplying an assist gas for fluidizing the powder to the transfer surface from a vertically lower side;
An assist gas supply device that switches between a transport state in which the powder is transported in the transport flow path and a closed state in which the transport flow path is blocked by the powder by switching the supply and stop of the supply of the assist gas. And a powder carrying device.   The powder conveying device according to claim 1, wherein the inclination angle is 10° or more, which is equal to or less than the repose angle of the powder. A downstream side pipe to which the powder supplied from the chute pipe is conveyed,
An airtight valve provided in the downstream pipe,
A determination unit that determines whether the transport channel is in the closed state,
The 1st control part which outputs the 1st control signal which closes the said airtight valve after the said determination part determined that it was in the said closed state, The powder of Claim 1 or Claim 2 characterized by the above-mentioned. Body transport device. An upstream pipe to which the powder supplied to the chute pipe is conveyed,
A differential pressure detector that detects a difference between the pressure of the first portion of the internal flow path of the upstream pipe and the pressure of the second portion upstream of the first portion,
The powder conveying apparatus according to claim 3, wherein the determination unit determines whether or not the closed state is established based on a detection result of the differential pressure detector. A second control unit for outputting a second control signal for opening the airtight valve,
The powder conveying device according to claim 3 or 4, wherein the assist gas supply device starts supplying the assist gas after the airtight valve is opened. A plurality of the assist gas supply holes are provided in the powder conveying direction,
The assist gas supply device has a plurality of air chambers provided in the transport direction and connected to the assist gas supply holes,
After starting the supply of the assist gas from the assist gas supply hole connected to the air chamber closest to the upstream upper end of the chute pipe among the plurality of air chambers, another air chamber after a predetermined time. The powder carrying device according to claim 5, wherein the supply of the assist gas from the assist gas supply hole connected to the start of the assist gas is started.   The flow velocity of the assist gas supplied from the assist gas supply hole, which is connected to the air chamber closest to the upper end of the chute pipe, of the plurality of air chambers and is jetted from the transfer surface is connected to another air chamber. 7. The powder conveying apparatus according to claim 6, wherein the flow velocity of the assist gas supplied from the generated assist gas supply hole is higher than the flow velocity ejected from the transfer surface. The transport surface includes a surface of a perforated plate, the assist gas supply hole includes a hole of the perforated plate,
The powder carrying device according to claim 1, wherein the assist gas supplied from the assist gas supply device is supplied through the holes of the perforated plate.   9. A purge gas supply port for supplying a purge gas to a transfer surface of the transfer passage, the closed state of which is not released by the supply of the assist gas from the assist gas supply hole, is provided. The powder conveying device as described in 1 above. The transport surface includes a first transport surface inclined at a first angle with respect to a horizontal plane, and a second transport surface whose angle formed by the horizontal plane is smaller than the first angle.
The powder carrying device according to any one of claims 1 to 9, wherein the second carrying surface is located at an upper end portion on the upstream side of the carrying surface. Of the second conveying surface, the distance between the boundary between the chute and the downstream end of the upstream pipe said powder supplied to the pipe is conveyed, the first conveying surface and the second conveying surface a powder conveying apparatus of claim 10, wherein not more than 0 [mm] longer 1000 [mm]. Charbin that stores char,
A char supply hopper for accommodating the char from the char bin, and the powder conveying device according to any one of claims 1 to 11, which conveys the char from the char bin to the char supply hopper,
A char recovery device comprising: Provided in the transport passage of the chute pipe, the powder is be deposited at least partially switches between supply and stop of the supply of the assist gas against the conveying surface inclined at a predetermined inclination angle from a horizontal plane, said conveying Switching between a transport state in which the powder is transported in the flow channel and a closed state in which the transport flow channel is blocked by the powder,
A powder conveying method characterized in that a sluice valve is not provided in an upstream side pipe for conveying the powder supplied to the chute pipe. A coal gasification furnace that gasifies pulverized coal to produce flammable product gas;
A char recovery device according to claim 12;
A gas refining facility for refining the generated gas in which the char is recovered to generate a fuel gas,
A gas turbine facility that burns at least a part of the fuel gas to drive the turbine to rotate;
An exhaust heat recovery boiler into which turbine exhaust gas from the gas turbine facility is introduced,
Steam turbine equipment for driving a turbine by the steam generated in the exhaust heat recovery boiler,
A gasification combined power generation facility, comprising: a generator connected to at least one of the gas turbine facility and the steam turbine facility.

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