Operation management method of dust collector, dust collector, and operation management method of plant including dust collector

Abstract

To evaluate a damage risk of a porous filter in a dust collector.SOLUTION: An operation management method of a dust collector according to at least one embodiment of the present disclosure includes the steps of: acquiring a temperature difference between a temperature of a surface on one side of a tube plate in a thickness direction and a temperature of a surface on the other side; and evaluating a damage risk of a porous filter due to deformation of the tube plate caused by a temperature difference on the basis of the temperature difference acquired in the step of acquiring the temperature difference.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present disclosure relates to an operation management method for a dust collector, a dust collector, and a plant equipped with a dust collector. [Background technology]

[0002] For example, an integrated gasification combined cycle power generation facility equipped with a coal gasifier is provided with a dust collector equipped with a porous filter for filtering and capturing char (unburned matter) in the gas generated by the coal gasifier. During normal operation of the coal gasifier, the char captured by the porous filter is brushed off by backwashing the inside of the porous filter with compressed nitrogen, and is then recovered in a hopper and reintroduced into the coal gasifier (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2012-1649 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the dust collecting device described in the above-mentioned Patent Document 1, the upper end of the porous filter (element) in the extension direction is supported and suspended by a support plate (tube plate). In addition, the lower end of the porous filter may be restrained to prevent the porous filter from shaking. In this case, if a temperature difference occurs between the upper and lower surfaces of the tube sheet during a transitional period such as when the gasification combined cycle power generation facility starts or stops operation, the tube sheet may deform so as to warp upward or downward. If the tube sheet deforms when the lower end of the porous filter is restrained, a bending moment may be generated in the porous filter, which may cause the porous filter to break. Therefore, it is necessary to evaluate the risk of breakage of the porous filter due to the warping of the tube sheet.

[0005] In view of the above circumstances, at least one embodiment of the present disclosure aims to evaluate the risk of damage to a porous filter in a dust collection device. [Means for solving the problem]

[0006] (1) A method for managing an operation of a dust collecting device according to at least one embodiment of the present disclosure, A method for managing operation of a dust collection device, comprising: The dust collecting device includes: a main body vessel into which the dust-containing gas is introduced; A plurality of porous filters are provided inside the main container for filtering the dust-containing gas; a tube plate that supports end regions on one side of the extension direction of the plurality of porous filters inside the main container; a restraining portion that restrains end regions of the plurality of porous filters on the other side in the extending direction inside the main container; having obtaining a temperature difference between a surface temperature on one side and a surface temperature on the other side in a thickness direction of the tube sheet; A step of evaluating a risk of damage to the porous filter caused by deformation of the tube sheet due to the temperature difference based on the temperature difference acquired in the step of acquiring the temperature difference; Equipped with.

[0007] (2) A dust collecting device according to at least one embodiment of the present disclosure, 1. A dust collection device for filtering dust-laden gas, comprising: The dust collecting device includes: a main body vessel into which the dust-containing gas is introduced; A plurality of porous filters are provided inside the main container for filtering the dust-containing gas; a tube plate that supports end regions on one side of the extension direction of the plurality of porous filters inside the main container; a restraining portion that restrains end regions of the plurality of porous filters on the other side in the extending direction inside the main container; A temperature sensor for measuring the temperature of the tube sheet; An evaluation device that acquires a temperature difference between the temperature of one surface of the tube sheet and the temperature of the other surface of the tube sheet in the thickness direction based on the temperature measured by the temperature sensor, and is capable of evaluating a risk of damage to the porous filter caused by deformation of the tube sheet due to the temperature difference based on the acquired temperature difference; Equipped with.

[0008] (3) A method for managing an operation of a plant including a dust collecting device according to at least one embodiment of the present disclosure, A method for managing an operation of a plant equipped with a dust collecting device, comprising the steps of: The dust collecting device includes: a main body vessel into which the dust-containing gas is introduced; A plurality of porous filters are provided inside the main container for filtering the dust-containing gas; a tube plate that supports end regions on one side of the extension direction of the plurality of porous filters inside the main container; a restraining portion that restrains end regions of the plurality of porous filters on the other side in the extending direction inside the main container; having obtaining a temperature difference between a surface temperature on one side and a surface temperature on the other side in a thickness direction of the tube sheet; A step of evaluating a risk of damage to the porous filter caused by deformation of the tube sheet due to the temperature difference based on the temperature difference acquired in the step of acquiring the temperature difference; changing an operation state of the plant so as to suppress the temperature difference when the risk of damage is determined to be high in the step of evaluating the risk of damage; Equipped with. Effect of the Invention

[0009] According to at least one embodiment of the present disclosure, the risk of damage to a porous filter in a dust collection device can be evaluated. [Brief description of the drawings]

[0010] [Figure 1] 1 is a schematic configuration diagram showing an integrated coal gasification combined cycle power generation facility according to the present disclosure. FIG. [Diagram 2] 2 is a schematic configuration diagram showing a porous filter device provided in the dust collection equipment of FIG. 1. [Diagram 3] 4 is a schematic diagram for explaining a state in which a porous filter is supported by a tube sheet. FIG. [Figure 4] 10 is a schematic diagram for explaining a bending moment occurring in a porous filter due to deformation of a tube sheet. FIG. [Diagram 5] 13 is a graph showing the relationship between the temperature difference between the upper surface and the lower surface and the bending moment generated in a porous filter. [Figure 6] 4 is a flowchart showing a procedure of a process in a dust collection device operation management method according to some embodiments. [Figure 7] 1 is a flowchart showing a procedure of a process in a plant operation management method according to some embodiments. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Hereinafter, some embodiments of the present disclosure will be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of components described as the embodiments or shown in the drawings are merely illustrative examples and are not intended to limit the scope of the present disclosure. For example, expressions expressing relative or absolute configuration, such as "in a certain direction," "along a certain direction," "parallel," "orthogonal," "center," "concentric," or "coaxial," not only strictly express such a configuration, but also express a state in which there is a relative displacement with a tolerance or an angle or distance to the extent that the same function is obtained. For example, expressions indicating that things are in an equal state, such as "identical," "equal," and "homogeneous," not only indicate a state of strict equality, but also indicate a state in which there is a tolerance or a difference to the extent that the same function is obtained. For example, expressions describing shapes such as a rectangular shape or a cylindrical shape do not only refer to rectangular shapes, cylindrical shapes, etc. in the strict geometric sense, but also refer to shapes that include uneven portions, chamfered portions, etc., to the extent that the same effect is obtained. On the other hand, the expressions "comprise," "include," "have," "includes," or "have" of one element are not exclusive expressions excluding the presence of other elements.

[0012] <Configuration of the integrated coal gasification combined cycle power generation facility 10> FIG. 1 shows an integrated coal gasification combined cycle power plant (gasification combined cycle power plant) according to the present disclosure. The integrated coal gasification combined cycle power plant (IGCC: Integrated Coal Gasification Combined Cycle) 10 uses air as an oxidant, and adopts an air combustion method in which a gasifier 14 produces a combustible gas (produced gas) from fuel. The integrated coal gasification combined cycle power plant 10 refines the produced gas produced in the gasifier 14 in a gas refinery 16 to produce a fuel gas, which is then supplied to a gas turbine 17 to generate power. That is, the integrated coal gasification combined cycle power plant 10 is an air combustion type (air-blown) power plant. For example, a carbon-containing solid fuel such as coal is used as the fuel supplied to the gasifier 14. In the following description, up and above refer to the upper side in the vertical direction, and down and below refer to the lower side in the vertical direction, and the vertical direction is not precise and includes an error.

[0013] As shown in FIG. 1 , the integrated coal gasification combined cycle power generation facility (integrated gasification combined cycle power generation facility) 10 includes a coal supply facility 11, a gasification furnace facility 14, a char recovery facility 15, a gas refining facility 16, a gas turbine 17, a steam turbine 18, a generator 19, and a heat recovery steam generator (HRSG) 20.

[0014] The coal supply facility 11 is supplied with coal, which is a carbon-containing solid fuel, as raw coal, and produces pulverized coal by pulverizing the coal with a coal mill (not shown) or the like. The pulverized coal produced by the coal supply facility 11 is pressurized at the outlet of the coal supply line 11a by nitrogen gas as a transport inert gas supplied from an air separation facility 42, which will be described later, and is supplied to the gasification furnace facility 14 via the fuel supply line 12. The inert gas is an inert gas with an oxygen content of about 5% by volume or less, and typical examples include nitrogen gas, carbon dioxide gas, and argon gas, but is not necessarily limited to about 5% by volume or less.

[0015] The gasification furnace facility 14 is supplied with pulverized coal produced in the coal supply facility 11, and is also supplied with char (unreacted coal and ash) recovered in the char recovery facility 15 for reuse.

[0016] In addition, the gasifier facility 14 is connected to a compressed air supply line 41 from the gas turbine 17 (compressor 61), and a part of the compressed air compressed by the gas turbine 17 is boosted to a predetermined pressure by a booster 68 so that it can be supplied to the gasifier facility 14. 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 11a 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 gasifier facility 14, and a char return line 46 from the char recovery facility 15 is connected to the second nitrogen supply line 45. Furthermore, the air separation facility 42 is connected to the compressed air supply line 41 by an oxygen supply line 47. The nitrogen separated by the air separation equipment 42 is used as a carrier gas for coal or char by flowing through a first nitrogen supply line 43 and a second nitrogen supply line 45. The oxygen separated by the air separation equipment 42 is used as an oxidizing agent in the gasification furnace equipment 14 by flowing through an oxygen supply line 47 and a compressed air supply line 41.

[0017] The gasification furnace facility 14 includes, for example, a two-stage entrained bed type gasification furnace. The gasification furnace facility 14 gasifies the coal (pulverized coal) and char supplied therein by partially burning them with an oxidizing agent (air, oxygen) to produce a generated gas. The gasification furnace facility 14 is provided with a foreign matter removal facility 48 that removes foreign matter (slag) mixed in with the pulverized coal. The gasification furnace facility 14 is connected to a generated gas line (gasification furnace exhaust gas piping) 49 that supplies generated gas toward the char recovery facility 15, so that the generated gas containing char can be discharged. In this case, as shown in FIG. 2, a syngas cooler (heat exchanger) that is a gas cooler may be provided in the generated gas line 49 to cool the generated gas to a predetermined temperature before supplying it to the char recovery facility 15.

[0018] The char recovery facility 15 includes a dust collection facility 51 and a supply hopper 52. In this case, the dust collection facility 51 is composed of one or more cyclones or porous filters, and can separate char contained in the generated gas generated in the gasification furnace facility 14. The generated gas from which the char has been separated is sent to the gas purification facility 16 through a gas discharge line 53. The supply hopper 52 is for storing the char separated from the generated gas in the dust collection facility 51. Note that a configuration may be made in which a bin is disposed between the dust collection facility 51 and the supply hopper 52, and a plurality of supply hoppers 52 are connected to this bin. A char return line 46 from the supply hopper 52 is connected to the second nitrogen supply line 45.

[0019] The gas purification equipment 16 purifies the generated gas from which the char has been separated by the char recovery equipment 15 by removing impurities such as sulfur compounds and nitrogen compounds. The gas purification equipment 16 then purifies the generated gas to produce fuel gas, which is supplied to a gas turbine 17. Note that since the generated gas from which the char has been separated still contains sulfur components (such as H2S), the gas purification equipment 16 removes and recovers the sulfur components using an amine absorption liquid or the like for effective use.

[0020] 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. The combustor 62 is connected to a compressed air supply line 65 from the compressor 61, a fuel gas supply line 66 from the gas purification facility 16, and a combustion gas supply line 67 extending toward the turbine 63. The gas turbine 17 is also provided with a compressed air supply line 41 extending from the compressor 61 to the gasification furnace facility 14, and a booster 68 is provided in the middle of the line. Therefore, in the combustor 62, 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 facility 16 are mixed and combusted to generate combustion gas, and the generated combustion gas is supplied to the turbine 63. The turbine 63 drives the generator 19 to rotate by rotating the rotating shaft 64 with the supplied combustion gas.

[0021] The steam turbine 18 includes a turbine 69 connected to the rotary shaft 64 of the gas turbine 17, and the generator 19 is connected to the base end of the rotary shaft 64. The exhaust heat recovery boiler 20 is connected to an exhaust gas line 70 from the gas turbine 17 (turbine 63), and generates steam by exchanging heat between the water supplied to the exhaust heat recovery boiler 20 and the exhaust gas of the turbine 63. The exhaust heat recovery boiler 20 is provided with a steam supply line 71 between the turbine 69 of the steam turbine 18 and the steam recovery line 72, and a condenser 73 is provided in the steam recovery line 72. The steam generated in the exhaust heat recovery boiler 20 may include steam generated by exchanging heat with the generated gas in the syngas cooler of the gasification furnace facility 14. Therefore, in the steam turbine 18, the turbine 69 is driven to rotate by the steam supplied from the exhaust heat recovery boiler 20, which rotates the rotary shaft 64 to drive the generator 19.

[0022] A gas purification system 74 is provided between the outlet of the heat recovery steam generator 20 and the chimney 75 .

[0023] <Operation of coal gasification combined cycle power generation facility> Next, the operation of the above-mentioned integrated coal gasification combined cycle power generation facility 10 will be described. In the integrated coal gasification combined cycle power generation facility 10, when raw coal (coal) is supplied to the coal supply facility 11, the coal is pulverized into fine particles in the coal supply facility 11 to become pulverized coal. The pulverized coal produced in the coal supply facility 11 is supplied to the gasifier facility 14 by flowing through a first nitrogen supply line 43 with nitrogen supplied from an air separation facility 42. In addition, char recovered in a char recovery facility 15 (described later) is supplied to the gasifier facility 14 by flowing through a second nitrogen supply line 45 with nitrogen supplied from the air separation facility 42. In addition, compressed air extracted from a gas turbine 17 (described later) is pressurized by a booster 68, and then supplied to the gasifier facility 14 through a compressed air supply line 41 together with oxygen supplied from the air separation facility 42.

[0024] In the gasifier 14, the supplied pulverized coal and char are combusted with compressed air (oxygen) and gasified to generate generated gas. The generated gas is then discharged from the gasifier 14 through a generated gas line 49 and sent to the char recovery facility 15.

[0025] In this char recovery facility 15, the generated gas is first supplied to a dust collection facility 51, whereby fine char contained in the generated gas is separated. Then, the generated gas from which the char has been separated is sent to the gas refining facility 16 through a gas discharge line 53. Meanwhile, the fine char separated from the generated gas is piled up in a supply hopper 52, and returned to the gasification furnace facility 14 through a char return line 46 for recycling.

[0026] The generated gas from which char has been separated by the char recovery facility 15 is refined in the gas refinement facility 16 to remove impurities such as sulfur compounds and nitrogen compounds, and a fuel gas is produced. A compressor 61 generates compressed air and supplies it to a combustor 62. The combustor 62 mixes the compressed air supplied from the compressor 61 with the fuel gas supplied from the gas refinement facility 16, and burns the mixture to generate a combustion gas. The combustion gas drives a turbine 63 to rotate, which in turn drives the compressor 61 and the generator 19 via a rotating shaft 64. In this manner, the gas turbine 17 can generate electricity.

[0027] The heat recovery boiler 20 generates steam by exchanging heat between the exhaust gas discharged from a turbine 63 in the gas turbine 17 and water supplied to the heat recovery boiler 20, and supplies the generated steam to the steam turbine 18. In the steam turbine 18, a turbine 69 is rotationally driven by the steam supplied from the heat recovery boiler 20, thereby rotating a generator 19 via a rotating shaft 64, thereby generating electricity. The gas turbine 17 and the steam turbine 18 do not have to be on the same shaft to rotate and drive one generator 19, but may be on different shafts to rotate and drive a plurality of generators.

[0028] Thereafter, in the gas purification equipment 74, harmful substances in the exhaust gas discharged from the heat recovery boiler 20 are removed, and the purified exhaust gas is released into the atmosphere through a chimney 75.

[0029] <Porous Filter Device 22> Next, the porous filter device 22 will be described with reference to Fig. 2 to Fig. 4. Fig. 2 mainly shows the porous filter device 22 provided in the dust collection facility 51 shown in Fig. 1. Fig. 3 is a schematic diagram for explaining the state in which a porous filter 24 (described later) is supported by a tube sheet 25 (described later). Fig. 4 is a schematic diagram for explaining the occurrence of a bending moment in the porous filter 24 due to deformation of the tube sheet 25. The porous filter device 22 is a dust collector for capturing char remaining in the generated gas (dust-containing gas). The porous filter device 22 includes a plurality of porous filters 24 for filtering the dust-containing gas in a porous filter container (main container) 23 to which the dust-containing gas is introduced. The porous filters 24 are filters having many pores and are made of, for example, ceramics or metal. The porous filters 24 are, for example, cylindrical, and a plurality of them are provided in parallel with each other with an axis in the vertical direction. The porous filters 24 divide the space in the porous filter device 22 into upper and lower parts, with the lower part being a pre-filtration space 22a into which the generated gas containing char flows before filtration, and the upper part being a post-filtration space 22b after filtration. The porous filter device 22 has a tube plate 25 that supports an end region 24U on one side (upper side) of the extension direction (vertical direction) of the multiple porous filters 24 inside the porous filter container 23, and a restraint portion 27 that restrains an end region 24L on the other side (lower side) of the extension direction of the multiple porous filters 24 inside the porous filter container 23.

[0030] A product gas line 49 for introducing the product gas containing char is connected to the pre-filtration space 22a of the porous filter device 22.

[0031] The downstream side of the product gas line 49 is inserted inside the porous filter container 23 and into the pre-filtration space 22a, and the downstream end 49d thereof opens upward.

[0032] The generated gas line 49 is used as a supply pipe through which generated gas from the gasification furnace facility 14 (see FIG. 1) flows into the porous filter vessel 23 .

[0033] A char discharge passage 26 for discharging the char separated by the porous filter 24 is connected to the bottom of the pre-filtration space 22a of the porous filter device 22. The char discharge passage 26 is provided with an on-off valve 26a.

[0034] A gas discharge line 53 is connected to the post-filtration space 22b of the porous filter device 22, which leads the product gas (clean gas) after char separation to the gas purification facility 16.

[0035] The control unit 30 is a control device that is responsible for overall control of the integrated coal gasification combined cycle power generation facility 10 including the porous filter device 22, and also has a function as an evaluation device 31, which will be described later. The control unit 30 is composed of, for example, a central processing unit (CPU), a random access memory (RAM), a read only memory (ROM), and a computer-readable storage medium. A series of processes for realizing various functions is stored in a storage medium or the like in the form of a program, for example, and the CPU reads the program into the RAM or the like and executes information processing and arithmetic processing to realize various functions. The program may be installed in a ROM or other storage medium in advance, may be provided in a state stored in a computer-readable storage medium, or may be distributed via a wired or wireless communication means. The computer-readable storage medium may be a magnetic disk, a magneto-optical disk, a CD-ROM, a DVD-ROM, a semiconductor memory, or the like.

[0036] 3, an end region 24U on one side (upper side) in the extending direction (vertical direction) of each porous filter 24 is supported by a tube sheet 25. An outer edge portion 25a of the tube sheet 25 is fixed to the inner circumference of the porous filter container 23. The porous filter container 23 has a cylindrical shape with a bottom and a lid centered on the central axis AX, and the tube sheet 25 has a disk shape. The tube sheet 25 has a plurality of through holes 25h in which the porous filters 24 are attached. Each of the porous filters 24 is inserted into a corresponding one of the through holes 25h and fixed to the tube sheet 25 at its upper end, for example.

[0037] As shown in Fig. 4, the end region 24L of each porous filter 24 is restrained by a restraining portion 27 to suppress horizontal vibration. The restraining portion 27 is configured to be able to restrain the end region 24L of each porous filter 24 so as to permit vertical movement of each porous filter 24 and movement within a limited range in the horizontal direction, while prohibiting horizontal movement beyond that range. In addition, the restraining portion 27 is configured so as not to impede the flow of dust-containing gas in the pre-filtration space 22a as much as possible.

[0038] <Bending moment generated by the porous filter 24> In the porous filter device 22 configured as described above, when a temperature difference ΔT (Tu-Tl) occurs between the temperature Tu of the upper surface 25U of the tube sheet 25 and the temperature Tl of the lower surface 25L of the tube sheet 25 during a transitional period such as when the integrated coal gasification combined cycle power generation facility 10 starts or stops operation, the tube sheet 25 may be deformed so as to warp upward or downward. In the example shown in Fig. 4, the temperature Tl of the lower surface 25L is higher than the temperature Tu of the upper surface 25U, so that the region 25i on the inner periphery of the lower surface 25L is warped so as to protrude downward.

[0039] If the tube sheet 25 of the porous filter 24 is deformed so as to be warped, the upper end region 24U of the porous filter 24 is bent due to the warping of the tube sheet 25, as shown in Fig. 4. However, since the lower end region 24L is restrained, if the tube sheet 25 of the porous filter 24 is deformed so as to be warped, a bending moment is generated in the porous filter 24, which may damage the porous filter 24. Therefore, it is necessary to evaluate the risk of damage to the porous filter 24 due to the warping of the tube sheet 25.

[0040] <Evaluation of the risk of breakage of the porous filter 24> Therefore, in the dust collector operation management method according to some embodiments, as described below, the risk of damage to the porous filter 24 is evaluated. Also, in the plant operation management method according to some embodiments, the operating state of the plant is changed when it is determined that the risk of damage to the porous filter 24 is high, as described below.

[0041] Fig. 5 is a graph showing the relationship between the temperature difference ΔT (Tu-Tl) between the temperature Tu of the upper surface 25U and the temperature Tl of the lower surface 25L, and the bending moment M generated in the porous filter 24. The graph in Fig. 5 was obtained, for example, by performing an FEM analysis in advance. 5 is a graph of the bending moment M generated in the porous filter 24 supported in the outer peripheral region 25o of the tube sheet 25 among the multiple porous filters 24. The deflection angle θ caused by deformation generated in the porous filter 24 due to deformation of the tube sheet 25 caused by the temperature difference ΔT is larger for the porous filter 24 supported on the radially outer side centered on the central axis AX of the tube sheet 25 than for the porous filter 24 supported in the vicinity of the central axis AX. Therefore, the risk of breakage of the porous filter 24 is evaluated taking into consideration the bending moment M generated in the porous filter 24 supported in the outer peripheral region 25o of the tube sheet 25 where the deflection angle θ is larger. FIG. 5 shows the bending moment M generated in the upper end region 24U of the porous filter 24 where the bending moment M is the largest.

[0042] The threshold value Mth of the bending moment M permissible in the porous filter 24 is obtained in advance. The temperature difference (control temperature range) ΔTth at which the bending moment M reaches this threshold value Mth can be obtained from the graph of FIG.

[0043] In the dust collection device operation management method according to some embodiments, the risk of damage to the porous filter 24 can be evaluated by comparing the temperature difference ΔT acquired as described below with the management temperature range ΔTth. In other words, if the temperature difference ΔT is below the controlled temperature range ΔTth, it can be determined that the risk of damage to the porous filter 24 is low, and if the temperature difference ΔT exceeds the controlled temperature range ΔTth, it can be determined that the risk of damage to the porous filter 24 is high.

[0044] In the dust collection device operation management method according to some embodiments, the evaluation device 31 is configured to compare the acquired temperature difference ΔT with the management temperature range ΔTth, and to evaluate the risk of damage to the porous filter 24. That is, the evaluation device 31 compares the acquired temperature difference ΔT with the controlled temperature range ΔTth, and determines that if the temperature difference ΔT is below the controlled temperature range ΔTth, the risk of damage to the porous filter 24 is low, and if the temperature difference ΔT exceeds the controlled temperature range ΔTth, the evaluation device 31 determines that the risk of damage to the porous filter 24 is high.

[0045] In addition, instead of evaluating the risk of damage to the porous filter 24 by comparing the temperature difference ΔT with the controlled temperature range ΔTth, the bending moment M corresponding to the acquired temperature difference ΔT and the temperature difference ΔT acquired from the graph of Figure 5 may be calculated, and the calculated bending moment M may be compared with a threshold value Mth of the bending moment M to evaluate the risk of damage to the porous filter 24. In this case, if the calculated bending moment M is less than the threshold value Mth of the bending moment M, it can be determined that the risk of damage to the porous filter 24 is low, and if the calculated bending moment M exceeds the threshold value Mth of the bending moment M, it can be determined that the risk of damage to the porous filter 24 is high. The evaluation device 31 compares the calculated bending moment M with the threshold value Mth of the bending moment M, and determines that the risk of damage to the porous filter 24 is low if the calculated bending moment M is less than the threshold value Mth of the bending moment M, and determines that the risk of damage to the porous filter 24 is high if the calculated bending moment M exceeds the threshold value Mth of the bending moment M.

[0046] The evaluation device 31 may be configured to be capable of notifying the controller 30 of the high risk of damage to the porous filter 24, for example, by issuing an alarm that can be recognized by an operator of the integrated coal gasification combined cycle power generation facility 10, when the evaluation device 31 determines that the risk of damage to the porous filter 24 is high. Furthermore, when the evaluation device 31 determines that the risk of damage to the porous filter 24 is high, the evaluation device 31 may output a control signal to the controller 30 to change the operating state of the integrated coal gasification combined cycle power generation facility 10 in order to reduce the temperature difference ΔT, together with or instead of the above notification. As a result, the control unit 30 changes the operating state of the integrated coal gasification combined cycle power plant 10 so as to reduce the temperature difference ΔT. Note that examples of changes to the operating state of the integrated coal gasification combined cycle power plant 10 so as to reduce the temperature difference ΔT include changes in the flow rate of the generated gas supplied to the porous filter device 22, and changes in the flow rates of the regenerated gas, inert gas, and the like supplied to the porous filter device 22 when the integrated coal gasification combined cycle power plant 10 starts up or stops operating.

[0047] <About obtaining temperature difference △T> It is conceivable that the temperature Tu of the upper surface 25U of the tube sheet 25 and the temperature Tl of the lower surface 25L thereof could be obtained by direct measurement using a temperature sensor such as a thermocouple. However, there is a risk that these temperatures may be affected by the atmospheric temperatures in the pre-filtration space 22a and the post-filtration space 22b after filtration, and in particular, direct measurement of the temperature of the lower surface 25L may cause problems such as the adhesion of char contained in the generated gas.

[0048] Therefore, in some embodiments of the method for managing the operation of a dust collection device, a temperature sensor 33 such as a thermocouple is provided on the inner surface of the through hole 25h extending in the thickness direction of the tube sheet 25, and the temperature Tu of the upper surface 25U and the temperature Tl of the lower surface 25L are estimated and obtained based on the measurement results of this temperature sensor 33. Specifically, upper temperature sensor 33U is disposed in an upper region within through-hole 25h, and lower temperature sensor 33L is disposed in a lower region within through-hole 25h. In addition, in order to further reduce the influence of the atmospheric temperature in the pre-filtration space 22a and the post-filtration space 22b after filtration, and to suppress the intrusion of char into the through hole 25h, the upper and lower opening ends of the through hole 25h are closed with cover members 35.

[0049] In addition, there is a difference between the temperature Tu' measured by the upper temperature sensor 33U and the temperature Tu of the upper surface 25U of the tube sheet 25, and there is a difference between the temperature Tl' measured by the lower temperature sensor 33L and the temperature Tl of the lower surface 25L of the tube sheet 25. Therefore, in some embodiments of the dust collection device operation management method, a heat conduction analysis is performed in advance to obtain information on the temperature at the installation position of the upper temperature sensor 33U, the temperature Tu of the upper surface 25U of the tube sheet 25, the temperature at the installation position of the lower temperature sensor 33L, and the temperature Tl of the lower surface 25L of the tube sheet 25, and the evaluation device 31 is configured to estimate the temperature difference ΔT based on the temperature Tu' measured by the upper temperature sensor 33U and the temperature Tl' measured by the lower temperature sensor 33L.

[0050] In the porous filter device 22 according to the embodiment described above, the downstream end 49d of the product gas line 49 opens upward below the region 25i on the inner periphery of the tube sheet 25. Therefore, as shown by the arrow a in Fig. 2, dust-containing gas and the like flows toward the lower surface 25L of the region 25i on the inner periphery of the tube sheet 25, so that the temperature difference ΔT tends to be higher in the region 25i on the inner periphery of the tube sheet 25 than in the region 25o on the outer periphery of the tube sheet 25. Therefore, in the dust collector operation management method according to some embodiments, the temperature is estimated by the temperature sensor 33 in the through hole 25h in the region 25i on the inner periphery side of the tube sheet 25. As a result, the temperature difference ΔT in the inner region 25i of the tube sheet 25, where the temperature difference ΔT is larger, is obtained, so that the bending moment M generated in the porous filter 24 is calculated to be larger, and the assessment of the risk of breakage of the porous filter 24 is on the safe side.

[0051] <Flowchart> Fig. 6 is a flowchart showing a procedure of a process in a dust collector operation management method according to some embodiments. Fig. 7 is a flowchart showing a procedure of a process in a plant operation management method according to some embodiments. The procedure shown in Fig. 6 is performed by the evaluation device 31. The procedure shown in Fig. 7 is performed by the evaluation device 31 and the control unit 30. The dust collecting device operation management method according to some embodiments shown in Fig. 6 and the plant operation management method according to some embodiments shown in Fig. 7 include step S1 of calculating a threshold value, step S3 of acquiring a temperature difference, and step S5 of evaluating a damage risk. The plant operation management method according to some embodiments shown in Fig. 7 further includes step S7 of changing the operating state of the plant.

[0052] <Step S1 of calculating the threshold value> The threshold value calculation step S1 is a step of calculating a threshold value Mth of the bending moment M based on the usage history of the porous filter 24. For example, the permissible stress of the porous filter 24 is reduced by a treatment such as pickling to remove clogging of the porous filter 24, compared to the porous filter 24 before the treatment.

[0053] Therefore, in some embodiments of the method for managing the operation of a dust collection device, the relationship between the number of treatments, such as pickling treatment, and the threshold value Mth of the bending moment M allowable in the porous filter 24 is obtained in advance and stored in a computer-readable storage medium. In step S1 of calculating the threshold value, the evaluation device 31 reads the threshold value Mth of the bending moment M corresponding to the usage history of the porous filter 24 provided in the porous filter device 22 from a computer-readable storage medium. As a result, the threshold value Mth of the bending moment M calculated (obtained) in step S1 for calculating the threshold value approaches an appropriate value based on the usage history of the porous filter 24.

[0054] <Step S3 of acquiring temperature difference> The temperature difference acquisition step S3 is a step for acquiring the temperature difference ΔT of the tube sheet 25. In the temperature difference acquisition step S3, the evaluation device 31 acquires the temperature difference ΔT based on the temperature measured by the upper temperature sensor 33U and the temperature measured by the lower temperature sensor 33L as described above.

[0055] In step S3 of acquiring the temperature difference, the temperature difference ΔT is estimated and acquired from the temperature of the tube sheet 25 measured by the temperature sensor 33. Therefore, even if it is difficult to measure the surface temperatures on one side and the surface temperatures on the other side of the tube sheet 25 in the thickness direction, the temperature difference ΔT between the surface temperatures on one side and the surface temperatures on the other side of the tube sheet 25 in the thickness direction can be acquired.

[0056] In step S3 of acquiring the temperature difference, the temperature difference ΔT is estimated and acquired from the temperature measured at the through hole 25h penetrating the tube sheet 25 in the thickness direction. This makes it difficult for the temperature measurement to be affected by the ambient temperature or dust in the dust-containing gas.

[0057] <Step S5 of assessing the risk of damage> Step S5 of evaluating the breakage risk is a step of evaluating the risk of breakage of the porous filter 24 caused by deformation of the tube sheet 25 due to the temperature difference ΔT, based on the temperature difference ΔT acquired in step S3 of acquiring the temperature difference. In step S5 of evaluating the risk of damage, as described above, the evaluation device 31 compares the acquired temperature difference ΔT with the controlled temperature range ΔTth, and determines that the risk of damage to the porous filter 24 is low if the temperature difference ΔT is below the controlled temperature range ΔTth, and determines that the risk of damage to the porous filter 24 is high if the temperature difference ΔT exceeds the controlled temperature range ΔTth. In step S5 of evaluating the risk of damage, instead of evaluating the risk of damage of the porous filter 24 by comparing the temperature difference ΔT with the control temperature range ΔTth as described above, the evaluation device 31 may calculate the bending moment M corresponding to the acquired temperature difference ΔT and the temperature difference ΔT acquired from the graph of Figure 5, and compare the calculated bending moment M with a threshold value Mth of the bending moment M to evaluate the risk of damage of the porous filter 24.

[0058] According to the dust collector operation management method according to some embodiments and the porous filter device 22 according to some embodiments, it is possible to evaluate the risk of damage to the porous filter 24 caused by deformation of the tube sheet 25 due to the temperature difference ΔT of the tube sheet 25 based on the temperature difference ΔT of the tube sheet 25. This makes it possible to determine whether or not measures to avoid damage to the porous filter 24 need to be taken, which contributes to reducing the possibility of damage to the porous filter 24.

[0059] <Step S7 of changing the operating state of the plant> Step S7 of changing the operating state of the plant is a step of changing the operating state of the integrated coal gasification combined cycle power plant 10 so as to suppress the temperature difference ΔT if it is determined in step S5 of evaluating the risk of damage that the risk of damage is high. In step S7 of changing the operating state of the plant, the evaluation device 31 outputs a control signal to the control unit 30 to change the operating state of the integrated coal gasification combined cycle power plant 10 so as to reduce the temperature difference ΔT. The control unit 30, having received the control signal, changes the operating state of the integrated coal gasification combined cycle power plant 10 so as to reduce the temperature difference ΔT as described above.

[0060] According to the plant operation management method according to some embodiments, the possibility of the porous filter 24 being damaged can be reduced.

[0061] The present disclosure is not limited to the above-described embodiments, and includes modifications to the above-described embodiments and appropriate combinations of these modifications.

[0062] The contents described in each of the above embodiments can be understood, for example, as follows. (1) An operation management method for a dust collector according to at least one embodiment of the present disclosure is an operation management method for a dust collector (porous filter device 22). The dust collector (porous filter device 22) has a main container (porous filter container 23) to which dust-containing gas is introduced, a plurality of porous filters 24 provided inside the main container (porous filter container 23) for filtering the dust-containing gas, a tube sheet 25 supporting an end region 24U on one side (upper side) in the extension direction (vertical direction) of the plurality of porous filters 24 inside the main container (porous filter container 23), and a restraining part 27 restraining an end region 24L on the other side (lower side) in the extension direction (vertical direction) of the plurality of porous filters 24 inside the main container (porous filter container 23). A method for managing operation of a dust collection device according to at least one embodiment of the present disclosure includes a step S3 of acquiring a temperature difference ΔT between a temperature Tu of one surface (upper surface 25U) of the tube sheet 25 in the thickness direction and a temperature Tl of the other surface (lower surface 25L), and a step S5 of evaluating the risk of damage to the porous filter 24 due to deformation of the tube sheet 25 caused by the temperature difference ΔT, based on the temperature difference ΔT acquired in step S3 of acquiring the temperature difference ΔT.

[0063] According to the above method (1), it is possible to evaluate the risk of damage to the porous filter 24 caused by deformation of the tube sheet 25 due to the temperature difference ΔT of the tube sheet 25, based on the temperature difference ΔT of the tube sheet 25. This makes it possible to determine whether or not measures to avoid damage to the porous filter 24 need to be implemented, which contributes to reducing the possibility of damage to the porous filter 24.

[0064] (2) In some embodiments, in the method (1) above, in step S5 of evaluating the risk of breakage, it may be confirmed that the temperature difference ΔT falls within a predetermined controlled temperature range ΔTth, in which the stress (bending moment M) generated in the porous filter 24 due to deformation is equal to or less than a threshold value Mth.

[0065] According to the above method (2), the risk of damage to the porous filter 24 can be evaluated relatively easily.

[0066] (3) In some embodiments, in the method (1) above, in step S5 of evaluating the risk of breakage, the stress (bending moment M) generated in the porous filter 24 due to deformation may be calculated based on the temperature difference ΔT, and it may be confirmed that the calculated stress (bending moment M) is equal to or less than a threshold value Mth.

[0067] According to the above method (3), the risk of damage to the porous filter 24 can be evaluated relatively easily.

[0068] (4) In some embodiments, in the method (2) or (3) above, the stress (bending moment M) may be a stress generated in the porous filter 24 supported in the outer peripheral region 25o of the tube sheet 25.

[0069] The temperature difference ΔT of the tube sheet 25 causes the tube sheet 25 to bend in the thickness direction toward the inner peripheral region 25i farther from the periphery than toward the peripheral region (outer peripheral region 25o). Therefore, the bending angle θ of the tube sheet 25 becomes larger from the inner peripheral region 25i toward the periphery. Therefore, when the above-mentioned bending (deformation) of the tube sheet 25 occurs, a larger bending moment is generated in the porous filter 24 supported in the outer peripheral region 25o than in the porous filter 24 supported in the inner peripheral region 25i of the tube sheet 25. According to the above method (4), it is possible to confirm that the stress generated in the porous filter 24 supported in the outer peripheral region 25o of the tube sheet 25 where a larger bending moment occurs is below the threshold value Mth, so that the evaluation of the risk of breakage of the porous filter 24 is an evaluation on the safe side.

[0070] (5) In some embodiments, in any of the above methods (1) to (4), in step S3 of acquiring the temperature difference ΔT, the temperature difference ΔT in the inner peripheral region 25i of the tube sheet 25 may be acquired.

[0071] For example, when dust-containing gas flows into the main container (porous filter container 23) at a position closer to the inner region 25i than to the outer region of the tube sheet 25, the temperature difference ΔT between the temperature of one surface of the tube sheet 25 and the temperature of the other surface in the thickness direction is larger in the inner region 25i than in the outer region of the tube sheet 25. In such a case, according to the method (5) above, the temperature difference ΔT in the inner region 25i of the tube sheet 25, where the temperature difference ΔT is larger, is obtained, so that the stress generated in the porous filter 24 is calculated to be larger, and the assessment of the risk of breakage of the porous filter 24 is on the safe side.

[0072] (6) In some embodiments, any of the methods (2) to (4) above may further include a step S1 of calculating the threshold value Mth based on a usage history of the porous filter 24.

[0073] For example, by subjecting the porous filter 24 to a treatment such as pickling to remove clogging, the permissible stress (bending moment M) of the porous filter 24 decreases compared to the porous filter 24 before the treatment. According to the above method (6), the calculated threshold value Mth approaches an appropriate value based on the usage history of the porous filter 24.

[0074] (7) In some embodiments, in any of the above methods (1) to (6), in step S3 of acquiring the temperature difference ΔT, the temperature difference ΔT may be estimated from the measured temperature of the tube sheet 25.

[0075] According to the method (7) above, even if it is difficult to measure the temperature of the surface on one side of the thickness direction of the tube sheet 25 and the temperature of the surface on the other side, the temperature difference ΔT between the temperature of the surface on one side of the thickness direction of the tube sheet 25 and the temperature of the surface on the other side can be obtained.

[0076] (8) In some embodiments, in the method of (7) above, in step S3 of acquiring the temperature difference ΔT, the temperature difference ΔT may be estimated and acquired from the temperature measured at the through hole 25h penetrating the tube sheet 25 in the thickness direction.

[0077] According to the above method (8), the temperatures Tu' and Tl' are less susceptible to the effects of the atmospheric temperature and dust in the dust-containing gas when being measured.

[0078] (9) A dust collecting device (porous filter device 22) according to at least one embodiment of the present disclosure is a dust collecting device for filtering dust-containing gas. The dust collecting device (porous filter device 22) according to at least one embodiment of the present disclosure includes a main container (porous filter container 23) to which dust-containing gas is introduced, a plurality of porous filters 24 provided inside the main container (porous filter container 23) for filtering the dust-containing gas, a tube plate 25 supporting an end region 24U on one side (upper side) in the extension direction (vertical direction) of the plurality of porous filters 24 inside the main container (porous filter container 23), and a tube plate 25 supporting an end region 24U on the other side (lower side) in the extension direction (vertical direction) of the plurality of porous filters 24 inside the main container (porous filter container 23). the temperature sensor 33 (upper temperature sensor 33U, lower temperature sensor 33L) for measuring the temperature of the tube sheet 25; and an evaluation device 31 capable of acquiring a temperature difference ΔT between the temperature Tu of one surface (upper surface 25U) in the thickness direction of the tube sheet 25 and the temperature Tl of the other surface (lower surface 25L) based on temperatures Tu', Tl' measured by the temperature sensors 33 (upper temperature sensor 33U, lower temperature sensor 33L), and of evaluating the risk of damage to the porous filter 24 due to deformation of the tube sheet 25 caused by the temperature difference ΔT based on the acquired temperature difference ΔT.

[0079] According to the above configuration (9), it is possible to evaluate the risk of damage to the porous filter 24 caused by deformation of the tube sheet 25 due to the temperature difference ΔT of the tube sheet 25, based on the temperature difference ΔT of the tube sheet 25. This makes it possible to determine whether or not measures to avoid damage to the porous filter 24 need to be taken, which contributes to reducing the possibility of damage to the porous filter 24.

[0080] (10) An operation management method for a plant including a dust collector according to at least one embodiment of the present disclosure is an operation management method for a plant (an integrated coal gasification combined cycle power generation facility 10) including a dust collector (a porous filter device 22). The dust collector (porous filter device 22) includes a main container (porous filter container 23) to which dust-containing gas is introduced, a plurality of porous filters 24 provided inside the main container (porous filter container 23) for filtering the dust-containing gas, a tube plate 25 supporting an end region 24U on one side (upper side) in the extension direction (vertical direction) of the plurality of porous filters inside the main container (porous filter container 23), and a restraining portion 27 restraining an end region 24L on the other side (lower side) in the extension direction (vertical direction) of the plurality of porous filters 24 inside the main container (porous filter container 23). A method for managing the operation of a plant including a dust collection device according to at least one embodiment of the present disclosure includes step S3 of acquiring a temperature difference ΔT between a temperature Tu of one surface (upper surface 25U) of the tube sheet 25 in the thickness direction and a temperature Tl of the other surface (lower surface 25L), step S5 of evaluating a risk of damage to the porous filter 24 caused by deformation of the tube sheet 25 due to the temperature difference ΔT based on the temperature difference ΔT acquired in step S3 of acquiring the temperature difference ΔT, and step S7 of changing the operating state of the plant (integrated coal gasification combined cycle power generation facility 10) so as to suppress the temperature difference ΔT if it is determined that the risk of damage is high in step S5 of evaluating the risk of damage.

[0081] According to the above method (10), the possibility of the porous filter 24 being damaged can be reduced. [Explanation of symbols]

[0082] 10: Coal gasification combined cycle power generation facility 11: Coal feeding equipment 11a: Coal supply line 12: Fuel supply line 14: Gasification furnace equipment 15: Char recovery facility 16: Gas purification equipment 17: Gas turbine 18: Steam turbine 19: Generator 20: Waste heat recovery boiler 22: Porous filter device 22a: Pre-filtration space 22b: Post-filtration space 23:Porous filter container 24:Porous filter 24U: End area 24L: End area 25:Tube plate 25h: Through hole 25i : area 25L: Bottom surface 25o: area 25U:Top surface 26: Char exhaust passage 26a: Opening and closing valve 27: Restraint part 30: Control section 31: Evaluation device 33: Temperature sensor 33U: Upper temperature sensor 33L: Lower temperature sensor 35: Lid member 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 49: Produced gas line 49d: Downstream end 51: Dust collection equipment 52: Supply hopper 53: Gas exhaust line 61: Compressor 62: Combustor 63: Turbine 64: Rotation axis 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 equipment 75: Chimney AX: Central axis M: Bending moment Mth: Threshold △T: Temperature difference △Tth: Controlled temperature range Tl :Temperature Tl' :Temperature Tu :Temperature Tu' :Temperature

Claims

1. A method for managing operation of a dust collection device, comprising: The dust collecting device includes: a main body vessel into which the dust-containing gas is introduced; A plurality of porous filters are provided inside the main container for filtering the dust-containing gas; a tube plate that supports end regions on one side of the extension direction of the plurality of porous filters inside the main container; a restraining portion that restrains end regions of the plurality of porous filters on the other side in the extending direction inside the main container; having obtaining a temperature difference between a surface temperature on one side and a surface temperature on the other side in a thickness direction of the tube sheet; A step of evaluating a risk of damage to the porous filter caused by deformation of the tube sheet due to the temperature difference based on the temperature difference acquired in the step of acquiring the temperature difference; Equipped with Methods for operating and managing dust collection equipment.

2. In the step of evaluating the risk of breakage, it is confirmed that the temperature difference falls within a predetermined controlled temperature range in which the stress generated in the porous filter due to the deformation is equal to or less than a threshold value. A method for managing operation of a dust collecting apparatus according to claim 1.

3. In the step of evaluating the risk of breakage, a stress generated in the porous filter due to the deformation is calculated based on the temperature difference, and it is confirmed that the calculated stress is equal to or less than a threshold value. A method for managing operation of a dust collecting apparatus according to claim 1.

4. The stress is a stress generated in the porous filter supported on the outer peripheral region of the tube sheet. A method for managing operation of a dust collecting apparatus according to claim 2 or 3.

5. In the step of acquiring the temperature difference, the temperature difference in an inner peripheral region of the tube sheet is acquired. A method for managing operation of the dust collecting apparatus according to any one of claims 1 to 3.

6. Calculating the threshold value based on a usage history of the porous filter; Equipped with A method for managing operation of a dust collecting apparatus according to claim 2 or 3.

7. In the step of acquiring the temperature difference, the temperature difference is estimated and acquired from the measured temperature of the tube sheet. A method for managing operation of the dust collecting apparatus according to any one of claims 1 to 3.

8. In the step of acquiring the temperature difference, the temperature difference is estimated and acquired from a temperature measured at a through hole penetrating the tube sheet in a plate thickness direction. The method for managing operation of a dust collecting apparatus according to claim 7.

9. 1. A dust collection device for filtering dust-laden gas, comprising: The dust collecting device includes: a main body vessel into which the dust-containing gas is introduced; A plurality of porous filters are provided inside the main container for filtering the dust-containing gas; a tube plate that supports end regions on one side of the extension direction of the plurality of porous filters inside the main container; a restraining portion that restrains end regions of the plurality of porous filters on the other side in the extending direction inside the main container; A temperature sensor for measuring the temperature of the tube sheet; An evaluation device that acquires a temperature difference between the temperature of one surface of the tube sheet and the temperature of the other surface of the tube sheet in the thickness direction based on the temperature measured by the temperature sensor, and is capable of evaluating a risk of damage to the porous filter caused by deformation of the tube sheet due to the temperature difference based on the acquired temperature difference; Equipped with Dust collection device.

10. A method for managing an operation of a plant equipped with a dust collecting device, comprising the steps of: The dust collecting device includes: a main body vessel into which the dust-containing gas is introduced; A plurality of porous filters are provided inside the main container for filtering the dust-containing gas; a tube plate that supports end regions on one side of the extension direction of the plurality of porous filters inside the main container; a restraining portion that restrains end regions of the plurality of porous filters on the other side in the extending direction inside the main container; having obtaining a temperature difference between a surface temperature on one side and a surface temperature on the other side in a thickness direction of the tube sheet; A step of evaluating a risk of damage to the porous filter caused by deformation of the tube sheet due to the temperature difference based on the temperature difference acquired in the step of acquiring the temperature difference; changing an operation state of the plant so as to suppress the temperature difference when the risk of damage is determined to be high in the step of evaluating the risk of damage; Equipped with A method for operating and managing a plant equipped with a dust collection device.

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