JP2018130700A - Dust collection equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce an impact flow rate of production gas which contains dust with respect to a dust collection pipe with a simple constitution.SOLUTION: Dust collection equipment 51 includes: a container 1; a pipe plate 2 which is provided in the container 1 and divides an interior of the container 1 into two spaces; dust collection pipes 3 which are provided with upper end parts thereof on the pipe plate 2 and are cylindrical; and a gas introduction pipe 4 which is provided at a lower side of the pipe plate 2 and supplies gas containing dust to the interior of the container 1. Therein, an opening part 4a of the gas introduction pipe 4 is opposed to the pipe plate 2, a diameter D of the opening part 4a of the gas introduction pipe 4 is set such that a cross-section average flow rate of the gas at the opening part 4a falls in a range of 5 to 15 m/s, H/D as a ratio of a distance H between the opening part 4a and the pipe plate 2 to a diameter D of the opening part 4a falls in a range of 0.5 to 1.5 and L/D as a ratio of a distance L between a center of the opening part 4a and a center of a dust collection pipe 3 closest from the opening part 4a to the diameter D of the opening part 4a falls in a range of 0.5 to 1.0.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a dust collector.

  In a combined coal gasification power generation facility equipped with a coal gasification furnace, unburned and ash dust (char) contained in the product gas generated in the coal gasification furnace is placed downstream of the coal gasification furnace. A dust collector that collects dust is installed.

  The dust collected by the dust collector is stored in a supply hopper provided below the dust collector, and the dust stored in the supply hopper is returned to the coal gasification furnace through a return pipe.

  Inside the dust collector, a plurality of dust collecting tubes in which a filter medium is formed in a cylindrical shape are arranged. The filter medium is composed of a sintered body such as metal or ceramics. The generated gas containing dust is supplied from the bottom to the top at the center of the dust collector via the gas inlet pipe, and the generated gas discharged from the outlet of the gas inlet pipe spreads to the surroundings while spreading to the surroundings. It flows toward. Dust contained in the generated gas accumulates on the surface of the dust collection tube. The dust accumulated on the surface of the dust collection tube is removed by supplying backwash gas every predetermined time. The dust removed is stored in the hopper.

Japanese Patent No. 4388510

  When the flow rate of the product gas discharged from the gas introduction pipe is excessive, dust such as char contained in the product gas wears the protective coating on the surface of the dust collection pipe. When the filter medium is a metal, wear of the dust collection tube causes corrosion of the dust collection tube. Especially in the vicinity of the gas inlet pipe, the concentration of the dust contained in the product gas is high and the jet of the product gas is fast, so that wear is likely to occur due to impact when dust hits the dust collection pipe, and the dust collection pipe is damaged. There is a fear.

  In the above-mentioned Patent Document 1, a diffuser is installed at the outlet portion of the gas introduction pipe, or a flow distribution unit is installed on the tube plate facing the opening of the diffuser, so that the generated gas containing dust collides with the dust collection pipe. Reducing the flow rate is disclosed.

  By the way, since the flow rate of the product gas flowing through the gas introduction pipe differs depending on the plant scale and operating conditions, it is required to reduce the collision flow velocity of the product gas containing dust to the dust collection pipe with a simple configuration in the dust collector. It has been.

  This invention is made in view of such a situation, Comprising: It aims at providing the dust collector which can reduce the collision flow velocity of the production gas containing the dust with respect to a dust collection pipe | tube with a simple structure. And

In order to solve the above problems, the dust collector of the present invention employs the following means.
That is, the dust collector according to the first aspect of the present invention includes a container, a wall portion installed in the container and dividing the inside of the container into two spaces, and a cylinder having an upper end portion provided on the wall portion. And a gas inlet pipe that is provided below the wall and supplies a gas containing dust into the container, and an opening of the gas inlet pipe is formed in the wall. The diameter of the opening of the gas introduction pipe is set so that the cross-sectional average flow velocity of the gas in the opening is in a range of 5 m / s to 15 m / s, and the opening and the gas H / D, which is the ratio of the distance H between the walls and the diameter D of the opening, is in the range of 0.5 to 1.5, and is closest to the center of the opening and the opening. L / D, which is the ratio of the distance L between the centers of the dust collection tubes and the diameter D of the opening, is 0.5 or more and 1. It is in the range of below.

According to this configuration, since the cross-sectional average flow velocity of the gas in the opening is 5 m / s or more, the gas ejected from the opening can be spread toward the dust collecting pipe, and the cross-sectional average flow velocity is 15 m / s or less. Therefore, it is possible to reduce the collision velocity of the gas against the dust collecting pipe and prevent wear or damage due to dust.
Moreover, since H / D which is a ratio of the distance H between the opening and the wall and the diameter D of the opening is 0.5 or more, the gas ejected from the opening is directed toward the dust collection tube. Since H / D is 1.5 or less, it is possible to reduce the collision flow velocity of the gas to the dust collecting pipe and prevent wear or damage due to dust.
Furthermore, L / D, which is the ratio of the distance L between the center of the opening and the center of the dust collecting tube closest to the opening, and the diameter D of the opening is 0.5 or more, so during operation Interference between the gas introduction pipe and the dust collection pipe can be prevented. Further, since the distance L between the center of the opening and the center of the dust collection tube closest to the opening is large, the collision velocity of the gas with respect to the dust collection tube is reduced. Since L / D is 1.0 or less, the container does not become too large.

In the first aspect, the gas introduction pipe may be installed at the center of the plurality of the dust collection pipes.
According to this configuration, the gas supplied into the container from the gas introduction pipe is directed from the gas introduction pipe installed at the center of the plurality of dust collection pipes to the dust collection pipe disposed around the gas introduction pipe. Flowing. Further, since the gas flows radially from the gas introduction pipe to the surrounding direction, when the distance L between the center of the opening and the center of the dust collection pipe closest to the opening becomes large, the collision velocity of the gas with respect to the dust collection pipe Is reduced.

  The said 1st aspect WHEREIN: The said wall part may have a board part and the refractory material installed in the said gas inlet tube side of the said board part.

  ADVANTAGE OF THE INVENTION According to this invention, the collision flow velocity of the production gas containing the dust with respect to a dust collection pipe | tube can be reduced with a simple structure.

It is a schematic block diagram which shows the coal gasification combined cycle power generation equipment which concerns on one Embodiment of this invention. It is a longitudinal section showing dust collection equipment concerning one embodiment of the present invention. It is a partial expanded longitudinal cross-sectional view which shows the gas introduction pipe | tube of the dust collection equipment which concerns on one Embodiment of this invention, a dust collection pipe | tube, and a tube sheet. It is a partial expanded longitudinal cross-sectional view which shows the gas introduction pipe | tube of the dust collection equipment which concerns on one Embodiment of this invention, a dust collection pipe | tube, and a tube sheet. It is a graph which shows the relationship between dust pipe flow velocity conventional ratio and L / D. It is a graph which shows the relationship between dust pipe flow velocity conventional ratio and L / D.

  An integrated coal gasification combined cycle (IGCC) 10 to which a dust collection facility 51 according to an embodiment of the present invention is applied uses air as an oxidizing agent. In the gasification furnace facility 14, An air combustion system that generates combustible gas (product gas) from fuel is adopted. And the coal gasification combined cycle power generation facility 10 refines the produced gas generated in the gasification furnace facility 14 into a fuel gas by the gas purification facility 16, and then supplies it to the gas turbine 17 to generate power. That is, the coal gasification combined power generation facility 10 of the present embodiment is an air combustion type (air blowing) power generation facility. As the fuel supplied to the gasifier facility 14, for example, a carbon-containing solid fuel such as coal is used.

  As shown in FIG. 1, a coal gasification combined power generation facility (gasification combined power generation device) 10 includes a coal supply facility 11, a gasification furnace facility 14, a char recovery facility 15, a gas purification facility 16, and a gas turbine. 17, a steam turbine 18, a generator 19, and a heat recovery steam generator (HRSG) 20.

  The coal supply facility 11 is supplied with coal, which is a carbon-containing solid fuel, as raw coal, and pulverizes the coal with a coal mill (not shown) to produce pulverized coal pulverized into fine particles. The pulverized coal produced in the coal supply facility 11 is pressurized by nitrogen gas as a transfer inert gas supplied from an air separation facility 42 to be described later at the outlet of the coal supply line 11a, toward the gasifier facility 14. Supplied. The inert gas is an inert gas having an oxygen content of about 5% by volume or less, and representative examples thereof include nitrogen gas, carbon dioxide gas, and argon gas, but are not necessarily limited to about 5% or less.

  The gasifier facility 14 is supplied with pulverized coal produced by the coal supply facility 11 and the char (unreacted ash and ash) recovered by the char recovery facility 15 is returned and supplied for reuse. Has been.

  In addition, a compressed air supply line 41 from a gas turbine 17 (compressor 61) is connected to the gasifier furnace 14, and a part of the compressed air compressed by the gas turbine 17 is given a predetermined pressure by a booster 68. The gas can be supplied to the gasifier facility 14 after being boosted. The air separation facility 42 separates and generates nitrogen and oxygen from air in the atmosphere, and the air separation facility 42 and the gasifier facility 14 are connected by a first nitrogen supply line 43. The first nitrogen supply line 43 is connected to a coal supply line 11 a from the coal supply facility 11. In addition, a second nitrogen supply line 45 branched from the first nitrogen supply line 43 is also connected to the gasification furnace facility 14, and a char return line 46 from the char recovery facility 15 is connected to the second nitrogen supply line 45. It is connected. Further, the air separation facility 42 is connected to the compressed air supply line 41 by an oxygen supply line 47. Then, the nitrogen separated by the air separation facility 42 is used as coal or char transport gas by flowing through the first nitrogen supply line 43 and the second nitrogen supply line 45. The oxygen separated by the air separation facility 42 is used as an oxidant in the gasifier facility 14 by flowing through the oxygen supply line 47 and the compressed air supply line 41.

  The gasifier facility 14 includes, for example, a two-stage spouted bed type gasifier. The gasifier facility 14 gasifies the coal (pulverized coal) and char supplied therein by partially combusting them with an oxidizing agent (air, oxygen) to produce a product gas. The gasifier facility 14 is provided with a foreign matter removing facility 48 for removing foreign matter (slag) mixed in the pulverized coal. The gasification furnace facility 14 is connected to a gas generation line (pipe section) 49 for supplying the generated gas toward the char recovery facility 15 so that the generated gas containing char can be discharged.

  The char collection facility 15 includes a dust collection facility 51 and a supply hopper 52. In this case, the dust collection facility 51 can separate the char contained in the product gas generated by the gasifier facility 14. Details of the dust collection equipment 51 according to the present embodiment will be described later. The product gas from which the char has been separated is sent to the gas purification facility 16 through the gas discharge line 53. The supply hopper 52 stores the char separated from the generated gas by the dust collection equipment 51. A bin may be disposed between the dust collection facility 51 and the supply hopper 52, and a plurality of supply hoppers 52 may be connected to the bin. A char return line 46 from the supply hopper 52 is connected to the second nitrogen supply line 45.

The gas purification facility 16 performs gas purification by removing impurities such as sulfur compounds and nitrogen compounds from the product gas from which the char has been separated by the char recovery facility 15. The gas purification facility 16 then refines the produced gas to produce fuel gas, and supplies this to the gas turbine 17. Since the product gas from which the char has been separated still contains sulfur (H ₂ S, etc.), the gas purification facility 16 removes and recovers the sulfur with an amine absorption liquid and effectively uses it. To do.

  The gas turbine 17 includes a compressor 61, a combustor 62, and a turbine 63, and the compressor 61 and the turbine 63 are connected by a rotating shaft 64. A compressed air supply line 65 from the compressor 61 is connected to the combustor 62, a fuel gas supply line 66 from the gas purification facility 16 is connected to the combustor 62, and a combustion gas supply line 67 extending toward the turbine 63 is connected. Is connected. In addition, the gas turbine 17 is provided with a compressed air supply line 41 extending from the compressor 61 to the gasifier facility 14, and a booster 68 is provided in the middle. Therefore, the combustor 62 generates combustion gas by mixing and combusting a part of the compressed air supplied from the compressor 61 and at least a part of the fuel gas supplied from the gas purification equipment 16. The generated combustion gas is supplied to the turbine 63. The turbine 63 rotates the generator 19 by rotating the rotating shaft 64 with the supplied combustion gas.

  The steam turbine 18 includes a turbine 69 that is connected to a rotating shaft 64 of the gas turbine 17, and the generator 19 is connected to a base end portion of the rotating shaft 64. The exhaust heat recovery boiler 20 is connected to an exhaust gas line 70 from the gas turbine 17 (the turbine 63), and generates steam by exchanging heat between the water supply and the exhaust gas of the turbine 63. The exhaust heat recovery boiler 20 is provided with a steam supply line 71 and a steam recovery line 72 between the steam turbine 18 and the turbine 69, and a condenser 73 is provided in the steam recovery line 72. Therefore, in the steam turbine 18, the turbine 69 is rotated by the steam supplied from the exhaust heat recovery boiler 20, and the generator 19 is rotated by rotating the rotating shaft 64.

  A gas purification facility 74 is provided from the outlet of the exhaust heat recovery boiler 20 to the chimney 75.

  Here, the action | operation of the coal gasification combined cycle power generation equipment 10 of this embodiment is demonstrated.

  In the coal gasification combined power generation facility 10 of the present embodiment, when raw coal (coal) is supplied to the coal supply facility 11, the coal is pulverized by being pulverized into fine particles in the coal supply facility 11. . The pulverized coal produced in the coal supply facility 11 is supplied to the gasifier facility 14 through the first nitrogen supply line 43 by nitrogen supplied from the air separation facility 42. Further, the char recovered by the char recovery facility 15 described later is supplied to the gasifier facility 14 through the second nitrogen supply line 45 by the nitrogen supplied from the air separation facility 42. Further, compressed air extracted from a gas turbine 17 described later is boosted by a booster 68 and then supplied to the gasifier facility 14 through the compressed air supply line 41 together with oxygen supplied from the air separation facility 42.

  In the gasifier furnace 14, the supplied pulverized coal and char are combusted by compressed air (oxygen), and the pulverized coal and char are gasified to generate product gas.

  In the char recovery facility 15, the generated gas is first supplied to the dust collection facility 51, whereby fine char (dust) contained in the generated gas is separated. The product gas from which the char has been separated is sent to the gas purification facility 16 through the gas discharge line 53. On the other hand, the fine char separated from the product gas is deposited in the supply hopper 52, returned to the gasifier facility 14 through the char return line 46, and recycled.

  The product gas from which the char has been separated by the char recovery facility 15 is subjected to gas purification by removing impurities such as sulfur compounds and nitrogen compounds in the gas purification facility 16 to produce fuel gas. The compressor 61 generates compressed air and supplies it to the combustor 62. The combustor 62 mixes the compressed air supplied from the compressor 61 and the fuel gas supplied from the gas refining facility 16 and combusts to generate combustion gas. By rotating the turbine 63 with this combustion gas, the compressor 61 and the generator 19 are rotationally driven via the rotating shaft 64. In this way, the gas turbine 17 can generate power.

The exhaust heat recovery boiler 20 generates steam by exchanging heat between the exhaust gas discharged from the turbine 63 in the gas turbine 17 and the feed water, and supplies the generated steam to the steam turbine 18. In the steam turbine 18, the turbine 69 is rotationally driven by the steam supplied from the exhaust heat recovery boiler 20, whereby the generator 19 can be rotationally driven via the rotating shaft 64 to generate electric power.
The gas turbine 17 and the steam turbine 18 do not have to rotate and drive one generator 19 as the same axis, and may rotate and drive a plurality of generators as different axes.

  Thereafter, in the gas purification equipment 74, harmful substances in the exhaust gas discharged from the exhaust heat recovery boiler 20 are removed, and the purified exhaust gas is released from the chimney 75 to the atmosphere.

Hereinafter, the dust collection equipment 51 according to the present embodiment will be described with reference to FIG.
The dust collection facility 51 is an example of a dust collector, and includes a container 1, a tube plate 2 provided in the container 1, a dust collection tube 3 having an upper end portion installed on the tube plate 2, and a gasifier facility. 14 includes a gas introduction pipe 4 or the like through which the produced gas containing char (dust) from 14 circulates and supplies the produced gas to the inside of the container 1.

  The container 1 is installed such that the intermediate portion 1A has a cylindrical shape and the cylindrical axis direction is the vertical direction. A conical cone portion 1B is installed at the lower end portion of the intermediate portion 1A of the container 1, and a char discharge port 1a is formed at the lower end portion of the cone portion 1B. The char discharge port 1 a is an opening through which the char is discharged to the supply hopper 52. Further, for example, a hemispherical cover 1C is installed at the upper end of the intermediate portion 1A of the container 1, and a generated gas outlet 1b is formed at the upper end of the cover 1C. The product gas outlet 1b is an opening through which the product gas is discharged, and the product gas from which the char has been removed through the dust collection pipe 3 is discharged.

  The tube plate 2 is an example of a wall portion and is a disk-shaped member, and is installed in the container 1 so that the plate surface is horizontal, for example, in the vicinity of the boundary between the intermediate portion 1A and the cover portion 1C. A plurality of through holes 2 a are formed in the tube plate 2 at positions where the dust collecting tubes 3 are installed. The upper end portion of the dust collection tube 3 is connected to the through hole 2a, and the generated gas that has passed through the dust collection tube 3 flows.

  The plurality of through holes 2 a are provided, for example, radially in the tube plate 2, and the plurality of dust collecting tubes 3 are also provided radially in the tube plate 2.

  By the tube plate 2, the interior of the container 1 is divided into a gas introduction chamber 6 and a gas discharge chamber 7. Note that a refractory material (not shown) may be installed on the side of the gas introduction pipe 4 in the tube sheet 2. In this case, the tube sheet 2 is an example of a plate part, and a wall part is comprised by the tube sheet 2 and a refractory material.

  The dust collection pipe 3 is formed by forming a filter medium in a cylindrical shape, and the filter medium is held in a cylindrical shape by a support material. A filter medium is comprised from sintered compacts, such as a metal or ceramics, for example. The dust collection tube 3 is suspended below the tube plate 2 so that the upper end portion is connected to the tube plate 2 and the cylindrical axis direction is the vertical direction. When collecting the char, the generated gas passes through the filter medium from the outside to the inside of the dust collection tube 3, and the char is collected on the outer peripheral surface of the dust collection tube 3. The product gas from which the char has been removed passes through the through hole 2 a from the inside of the dust collection tube 3 and is introduced into the gas discharge chamber 7.

  Since char is deposited on the outer peripheral surface of the dust collection pipe 3, it is wiped off by the backwash gas every predetermined time. When performing the backwashing process, the backwashing gas is supplied from the gas discharge chamber 7, passes through the filter medium from the inside to the outside of the dust collection pipe 3, and removes the char accumulated on the outer peripheral surface of the dust collection pipe 3. The removed char passes through the char discharge port 1a and is accommodated in the supply hopper 52.

  The gas introduction pipe 4 is installed through the side surface of the container 1 and supplies the generated gas from the outside to the inside of the container 1. The gas introduction pipe 4 is provided horizontally, for example, on the side surface of the container 1, is bent in the vertical direction at a substantially intermediate portion inside the container 1, and the axial direction is installed in the vertical direction. The vertical portion of the gas introduction pipe 4 is located at the center of the tube plate 2 and the centers of the plurality of dust collection pipes 3. The opening 4 a of the gas introduction tube 4 faces the tube plate 2. The produced gas containing char is blown out from the opening 4a of the gas introduction pipe 4, and the produced gas flows toward the tube plate 2 and then spreads and flows toward the plurality of dust collecting tubes 3 arranged radially.

  The opening 4a of the gas introduction pipe 4 may be a cylindrical straight pipe, or may be formed in a truncated cone shape spreading toward the downstream side.

  Next, with reference to FIG.3 and FIG.4, the relationship between the gas introduction pipe | tube 4, the dust collection pipe | tube 3, and the tube sheet 2 in the dust collection equipment 51 which concerns on this embodiment is demonstrated.

  The diameter D (see FIG. 3) of the opening 4a of the gas introduction pipe 4 is set so that the cross-sectional average flow velocity of the product gas in the opening 4a is in the range of 5 m / s to 15 m / s.

  When the average flow velocity of the product gas in the opening 4a is less than 5 m / s depending on the setting of the diameter D of the opening 4a of the gas introduction pipe 4, the generated gas ejected from the opening 4a 3 and cannot be collected uniformly. On the other hand, in this embodiment, since the cross-sectional average flow velocity of the product gas in the opening 4a is 5 m / s or more by setting the diameter D of the opening 4a of the gas introduction pipe 4, the generation spouted from the opening 4a The gas can be spread toward the dust collection pipe 3, and the generated gas reaches the dust collection pipe 3 installed on the outer peripheral side.

  When the cross-sectional average flow velocity of the product gas in the opening 4a exceeds 15 m / s due to the setting of the diameter D of the opening 4a of the gas introduction pipe 4, the collision speed of the produced gas with respect to the dust collection pipe 3 is fast, so that char is collected. Wear of the dust collection tube 3 is likely to occur due to an impact when it hits the dust tube 3. On the other hand, in this embodiment, since the cross-sectional average flow velocity of the generated gas in the opening 4a is 15 m / s or less by setting the diameter D of the opening 4a of the gas introduction tube 4, the local top of the dust collection tube 3 is locally increased. The flow rate can be reduced. As a result, the collision flow velocity of the char contained in the generated gas with respect to the dust collection pipe 3 is reduced, and wear and damage by the char can be prevented.

  H / D which is a ratio of the distance H between the opening 4a and the tube sheet 2 and the diameter D of the opening 4a is in the range of 0.5 to 1.5.

  Further, when H / D, which is a ratio of the distance H between the opening 4a and the tube plate 2 and the diameter D of the opening 4a, is less than 0.5, the collision flow velocity of the generated gas with respect to the dust collection tube 3 Therefore, the dust collecting tube 3 is likely to be worn by an impact when the char hits the dust collecting tube 3. On the other hand, in this embodiment, since H / D is 0.5 or more, as shown in FIG. 4, the flow rate of the product gas is reduced as it spreads in the radial direction. As a result, the collision flow velocity of the char contained in the generated gas with respect to the dust collection pipe 3 is reduced, and wear and damage by the char can be prevented.

  When H / D, which is the ratio of the distance H between the opening 4a and the tube sheet 2 and the diameter D of the opening 4a, exceeds 1.5, the generated gas ejected from the opening 4a It does not reach the dust collection tube 3 and cannot be collected uniformly. On the other hand, in this embodiment, since H / D is 1.5 or less, the generated gas ejected from the opening 4a can be supplied to the dust collection pipe 3, and the dust collection installed on the outer peripheral side. The product gas also reaches the tube 3.

  L / D, which is the ratio of the distance L between the center of the opening 4a and the center of the dust collecting tube 3 closest to the opening 4a and the diameter D of the opening 4a, is 0.5 or more and 1.0 or less. It is a range.

  When the distance L between the center of the opening 4a and the center of the dust collecting tube 3 closest to the opening 4a and the diameter D of the opening 4a is less than 0.5, When the dust collection tube 3 swings during operation of the dust facility 51, the gas introduction tube 4 and the dust collection tube 3 may come into contact with each other. On the other hand, in this embodiment, since L / D is 0.5 or more, interference between the gas introduction pipe 4 and the dust collection pipe 3 during the operation of the dust collection equipment 51 can be prevented. Further, as shown in FIG. 4, the local flow velocity at the upper part of the dust collection tube 3 is attenuated as the generated gas spreads in the radial direction of the tube plate 2. Further, since the gas flows radially from the gas introduction pipe 4 to the surrounding direction, when the distance L between the center of the opening 4a and the center of the dust collection pipe 3 closest to the opening 4a increases, the dust collection pipe 3 The collision flow velocity of the produced gas with respect to is reduced. As a result, the collision flow velocity of the char contained in the generated gas with respect to the dust collection pipe 3 is reduced, and wear and damage by the char can be prevented.

  Moreover, L / D which is a ratio of the distance L between the center of the opening 4a and the center of the dust collecting tube 3 closest to the opening 4a and the diameter D of the opening 4a exceeds 1.0. Since the installation positions of the dust collecting tubes 3 are also located away from the center of the tube plate 2, the size of the container 1 is increased. On the other hand, in this embodiment, since L / D is 1.0 or less, the container 1 does not become too large.

  Next, referring to the graphs of FIGS. 5 and 6, the flow rate in the dust collection pipe 3 closest to the gas introduction pipe 4 is compared with the conventional one.

  As shown in FIG. 5, H / D is 0.5 when the diameter D of the opening 4a of the gas introduction pipe 4 is set and the cross-sectional average flow velocity of the product gas in the opening 4a is 5 m / s. When (marker: rhombus) and H / D is 1.5 (marker: square), the L / D is in the range of 0.5 or more and 1.0 or less. As for the flow velocity in the dust collecting pipe 3 closest to 4, the conventional ratio is less than 1.0, which is lower than the conventional one.

  As shown in FIG. 6, when the diameter D of the opening 4a of the gas introduction tube 4 is set, the H / D is 0.5 when the cross-sectional average flow velocity of the product gas in the opening 4a is 15 m / s. When (marker: round shape), L / D is in the range of 0.9 or more and 1.0 or less, the flow rate in the dust collection pipe 3 closest to the gas introduction pipe 4 is less than 1.0 in the conventional ratio, It is reduced compared to the past. When the diameter D of the opening 4a of the gas introduction pipe 4 is set and the cross-sectional average flow velocity of the product gas in the opening 4a is 15 m / s, H / D is 0.5 (marker: triangle ) In the range where L / D is 0.55 or more and 1.0 or less, the flow velocity in the dust collection pipe 3 closest to the gas introduction pipe 4 is less than 1.0 compared to the conventional ratio, and is reduced compared to the conventional one. ing.

  When L / D is in the range of 0.9 to 1.0, the cross-sectional average flow velocity of the product gas in the opening 4a is in the range of 5 m / s to 15 m / s, and H / D is 0.5. When it is in the range of 1.5 or less, the flow velocity in the dust collection pipe 3 closest to the gas introduction pipe 4 can be surely reduced as compared with the conventional case.

  When the diameter D of the opening 4a of the gas introduction pipe 4 is set, the cross-sectional average flow velocity of the product gas in the opening 4a is 15 m / s and H / D is 0.5. Even if D is 0.5, the flow velocity in the dust collection pipe 3 closest to the gas introduction pipe 4 is less than twice that of the conventional case. If the conventional flow velocity (absolute value) in the dust collection tube 3 closest to the gas introduction tube 4 to be compared is a flow velocity at which wear is not likely to occur due to impact when the char hits the dust collection tube 3, the gas introduction The diameter D of the opening 4a of the tube 4 is set so that the cross-sectional average flow velocity of the product gas in the opening 4a is in the range of 5 m / s to 15 m / s, and H / D is 0.5 to 1. When it is in the range of 5 or less and L / D is in the range of 0.5 or more and 1.0 or less, wear due to impact when the char hits the dust collection tube 3 is unlikely to occur.

  As described above, in the present embodiment, the diameter D of the opening 4a of the gas introduction pipe 4 is set so that the cross-sectional average flow velocity of the product gas in the opening 4a is in the range of 5 m / s to 15 m / s. If D is in the range of 0.5 or more and 1.5 or less, and L / D is in the range of 0.5 or more and 1.0 or less, it is due to the impact when the char hits the dust collecting tube 3. Wear is difficult to occur. That is, the diameter D of the opening 4a of the gas introduction pipe 4, the distance H between the opening 4a and the tube plate 2, and the distance between the center of the opening 4a and the center of the dust collecting pipe 3 closest to the opening 4a. By setting the distance L, it is possible to easily reduce the collision flow velocity of the product gas containing char with respect to the dust collection tube 3.

  Therefore, it is possible to reduce the wear and damage of the dust collection tube 3 with a simple configuration and low cost without installing additional equipment and parts for the dust collection equipment 51.

  In addition, although the said embodiment demonstrated the case where the produced gas which passed the dust collection equipment 51 was used for the coal gasification combined cycle power generation equipment 10, the produced gas produced | generated by the gasification furnace equipment 14 and passed the dust collection equipment 51 is the In addition, it may be used in a synthesis gas production plant as a raw material for synthesis gas.

  In the above-described embodiment, coal is used as a fuel. However, it can be applied to high-grade coal or low-grade coal, and is not limited to coal, but can be used as a renewable biological organic resource. For example, it is also possible to use thinned wood, waste wood, driftwood, grass, waste, sludge, tires, and recycled fuel (pellets and chips) made from these raw materials. .

  In addition, although this embodiment illustrated about the tower type gasification furnace as a gasification furnace, a gasification furnace can be implemented similarly also with a crossover type gasification furnace.

DESCRIPTION OF SYMBOLS 1: Container 1A: Intermediate | middle part 1B: Conical part 1C: Cover part 1a: Char discharge port 1b: Generated gas outlet 2: Tube plate 2a: Through-hole 3: Dust collection pipe 4: Gas introduction pipe 4a: Opening part 6: Gas Introduction chamber 7: Gas discharge chamber 10: Coal gasification combined power generation facility 11: Coal supply facility 11a: Coal supply line 14: Gasifier facility 15: Char recovery facility 16: Gas purification facility 17: Gas turbine 18: Steam turbine 19 : Generator 20: Waste heat recovery boiler 41: Compressed air supply line 42: Air separation equipment 43: First nitrogen supply line 45: Second nitrogen supply line 46: Char return line 47: Oxygen supply line 48: Foreign matter removal equipment 51 : Dust collection equipment 52: Supply hopper 53: Gas discharge line 61: Compressor 62: Combustor 63: Turbine 64: Rotating shaft 65: Compressed air supply line 66: Fuel gas Supply line 67: the combustion gas supply line 68: booster 69: Turbine 70: exhaust gas line 71: Steam supply line 72: the vapor recovery line 73: a condenser 74: gas purification equipment 75: chimney

Claims (3)

A container,
A wall portion installed in the container and dividing the inside of the container into two spaces;
A dust collecting pipe whose upper end is a cylindrical shape provided on the wall; and
A gas introduction pipe that is provided below the wall and supplies a gas containing dust into the container;
With
The opening of the gas introduction pipe faces the wall,
The diameter of the opening of the gas introduction pipe is set so that the cross-sectional average flow velocity of the gas in the opening is in the range of 5 m / s to 15 m / s,
H / D, which is a ratio of the distance H between the opening and the wall and the diameter D of the opening, is in the range of 0.5 to 1.5.
L / D, which is the ratio of the distance L between the center of the opening and the center of the dust collecting tube closest to the opening and the diameter D of the opening, is 0.5 or more and 1.0 or less. Dust collector that is range.   The dust collector according to claim 1, wherein the gas introduction pipe is installed at a center of the plurality of dust collection pipes. The dust collector according to claim 1 or 2, wherein the wall portion includes a plate portion and a refractory material installed on the gas introduction pipe side of the plate portion.

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