Gypsum dehydration system

Abstract

To provide a gypsum dewatering system that can improve maintainability and be downsized.SOLUTION: Provided is a gypsum dewatering system for dewatering gypsum slurry discharged from an exhaust gas desulfurization apparatus, including: a first gypsum separator including a first conveyor belt for conveying the gypsum slurry along a first direction toward one side of the first direction; a second gypsum separator located at a distance from the first gypsum separator in a second direction that intersects the first direction, the second gypsum separator including a second conveyor belt for conveying the gypsum slurry along the first direction toward the above-mentioned one side of the first direction; at least one first measurement device located on the second gypsum separator side in the second direction of the first gypsum separator; at least one second measurement device located on the first gypsum separator side in the second direction of the second gypsum separator; and a first walkway with a first floor surface extending along the first direction between the first and second gypsum separators.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a gypsum dewatering system for dewatering gypsum slurry discharged from a flue gas desulfurization system. [Background technology]

[0002] For example, exhaust gas emitted from combustion engines such as boilers contains air pollutants such as sulfur oxides (SOx). A known desulfurization device for reducing the SOx contained in exhaust gas is an absorption tower that brings the exhaust gas introduced therein into contact with limestone slurry (washing liquid) sprayed by spray nozzles installed inside, thereby causing the SOx in the exhaust gas to be absorbed by the washing liquid (see, for example, Patent Document 1).

[0003] Patent Document 1 discloses that the SOx in the exhaust gas removed in the absorption tower reacts with calcium in the sprayed washing solution to form calcium sulfite as an intermediate product, which is then oxidized to gypsum by air supplied to the absorption tower to form the final product (gypsum). Patent Document 1 also discloses that the washing solution extracted to the outside of the absorption tower by an extraction pump is sent to a gypsum separator, and the final product is recovered as powdered gypsum.

[0004] Furthermore, Patent Document 1 mentions that one combustion engine system is generally provided with one absorption tower, one regular gypsum separator, and one spare gypsum separator. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 2020-157272 Summary of the Invention [Problem to be solved by the invention]

[0006] Generally, the regular gypsum separator and the spare gypsum separator are manufactured according to the same design concept, and the inspection walkways for inspecting the regular gypsum separator and the spare gypsum separator are located in the same position relative to each gypsum separator. The gypsum separator and the inspection walkways are long in the longitudinal direction, which poses the problem that a large building area is required to install two gypsum separators and two inspection walkways. Furthermore, inspecting two gypsum separators using two inspection walkways requires going back and forth between the two inspection walkways, which is time-consuming and labor-intensive.

[0007] The present disclosure has been made in consideration of the above-described problems, and aims to provide a gypsum dehydration system that can improve maintainability and can be made smaller. [Means for solving the problem]

[0008] A gypsum dewatering system according to at least one embodiment of the present disclosure includes: A gypsum dehydration system for dehydrating gypsum slurry discharged from a flue gas desulfurization apparatus, a first gypsum separator including a first conveyor belt configured to convey the gypsum slurry on a first filter cloth along a first direction toward one side of the first direction; a second gypsum separator disposed at a position away from the first gypsum separator in a second direction intersecting the first direction, the second gypsum separator including a second conveyor belt configured to convey the gypsum slurry along the first direction toward the one side of the first direction while the gypsum slurry is placed on a second filter cloth; At least one first measuring device for measuring a state of the first gypsum separator, the at least one first measuring device being arranged on the second gypsum separator side in the second direction; At least one second measuring device for measuring a state of the second gypsum separator, the at least one second measuring device being arranged on the first gypsum separator side in the second direction of the second gypsum separator; and a first walkway having a first floor surface extending along the first direction between the first gypsum separator and the second gypsum separator. [Effects of the Invention]

[0009] According to at least one embodiment of the present disclosure, a gypsum dewatering system that can improve maintainability and achieve miniaturization is provided. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a schematic view of a gypsum dewatering system according to one embodiment, viewed from above a first floor surface. [Figure 2] 1 is a schematic view of a building in which a gypsum dewatering system according to one embodiment is installed, taken along a first direction. [Figure 3] FIG. 2 is an explanatory diagram for explaining a configuration of a plurality of gypsum separators in one embodiment. [Figure 4] 2 is a schematic diagram of a first walkway, a second walkway, a connecting passageway, and an elevator shaft along a first direction in one embodiment. FIG. [Figure 5] FIG. 2 is a schematic diagram showing the first and second walkways, the connecting passageway, and the elevator shaft as viewed from above in one embodiment. [Figure 6] 1 is a schematic view of a building in which a gypsum dewatering system according to one embodiment is installed, taken along a first direction. [Figure 7] FIG. 2 is a schematic view of a gypsum dewatering system according to one embodiment, viewed from above a second floor surface. [Figure 8] FIG. 2 is a schematic view of the vicinity of a chute of a gypsum dewatering system according to one embodiment, viewed from above. [Figure 9] FIG. 2 is a schematic diagram of a panel that constitutes a chute section in one embodiment. [Figure 10] 1 is a schematic view of a gypsum dewatering system according to one embodiment, taken along a first direction near a chute section. FIG. [Figure 11] FIG. 4 is a schematic view of a gypsum dewatering system according to one embodiment, taken along a second direction near a chute section. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, several 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 embodiments or shown in the drawings are merely illustrative examples and are not intended to limit the scope of the present disclosure.

[0012] (Gypsum dehydration system) Fig. 1 is a schematic view of a gypsum dehydration system 1 according to one embodiment, viewed from above a first floor surface 52. Fig. 2 is a schematic view of a building 10 in which a gypsum dehydration system 1 according to one embodiment is installed, taken along a first direction. Fig. 3 is an explanatory diagram for illustrating the configuration of multiple gypsum separators 3 and 4 according to one embodiment. The gypsum dehydration system 1 according to some embodiments is for dehydrating gypsum slurry (absorption liquid containing gypsum) discharged from a flue gas desulfurization apparatus 2 (see Fig. 3) to produce gypsum.

[0013] (Exhaust gas desulfurization equipment) The flue gas desulfurization system 2 is configured to remove sulfur oxides from the flue gas by bringing flue gas emitted from a combustion device such as an engine or a boiler into contact with an absorption liquid and causing the absorption liquid to absorb the sulfur oxides (e.g., sulfur dioxide gas) in the flue gas. In the flue gas desulfurization system 2 using the lime-gypsum method, a slurry containing an alkaline component, such as limestone slurry in which limestone is dissolved (dispersed), is used as the absorption liquid, and gypsum slurry (absorption liquid containing gypsum) is produced as a by-product.

[0014] (1st gypsum separator, 2nd gypsum separator) 1, the gypsum dehydration system 1 includes a plurality of gypsum separators 3 and 4 configured to dehydrate a gypsum slurry and separate the gypsum slurry into gypsum and a filtrate. The plurality of gypsum separators 3 and 4 include a first gypsum separator 3 including a first filter cloth 31 and a first conveyor belt 32, and a second gypsum separator 4 including a second filter cloth 41 and a second conveyor belt 42.

[0015] The first conveyor belt 32 is configured to convey the gypsum slurry along a first direction (left-right direction in FIG. 1) toward one side of the first direction (left side in FIG. 1) with the gypsum slurry placed on the first filter cloth 31. The first conveyor direction, which is the conveying direction of the first conveyor belt 32, is a direction along the first direction, and the downstream side of the first conveyor direction is the one side in the first direction.

[0016] 1, the second gypsum separator 4 is disposed at a position spaced apart from the first gypsum separator 3 in a second direction (vertical direction in FIG. 1) that intersects (orthogonal in the illustrated example) the first direction. The second conveyor belt 42 is disposed at a position spaced apart from the first conveyor belt 32 in the second direction.

[0017] The second conveyor belt 42 is configured to convey the gypsum slurry along the first direction toward the one side in the first direction with the gypsum slurry placed on the second filter cloth 41. A second conveyance direction, which is the conveyance direction of the second conveyor belt 42, is a direction along the first direction, and the downstream side of the second conveyance direction is the one side in the first direction.

[0018] 3, the first gypsum separator 3 further includes a first upstream drum 33A disposed upstream in the first conveying direction and configured to be rotatably supported, a first downstream drum 33B disposed downstream in the first conveying direction and configured to be rotatably supported, and a first motor 34 mechanically connected to the first downstream drum 33B and configured to rotationally drive the first downstream drum 33B. The first downstream drum 33B is disposed downstream of the first upstream drum 33A in the first conveying direction.

[0019] The first conveyor belt 32 is an endless belt made of a rubber (elastic) sheet. The first conveyor belt 32 is stretched over the first upstream drum 33A and the first downstream drum 33B and is tensioned between the first upstream drum 33A and the first downstream drum 33B.

[0020] The first filter cloth 31 is an endless belt-like breathable sheet made of a resin such as polyester or polypropylene. The first filter cloth 31 has a supported portion 311 in a part of its length that is superimposed on the upper surface 321 of the first conveyor belt 32. The supported portion 311 is supported by the first conveyor belt 32 so as to be able to move freely together with the first conveyor belt 32 in the first conveying direction.

[0021] By driving the first motor 34, the first upstream drum 33A and the first downstream drum 33B are driven to rotate, and the first conveyor belt 32 moves in a circular motion. As the first conveyor belt 32 moves in a circular motion, the upper surface 321 of the first conveyor belt 32 and the supported portion 311 of the first filter cloth 31 run downstream in the first conveyor direction.

[0022] A plurality of holes for allowing moisture to pass through are formed in the first filter cloth 31 and the first conveyor belt 32. When the gypsum slurry placed on the first filter cloth 31 is conveyed together with the first filter cloth 31 by the first conveyor belt 32, moisture (filtrate) passes through the plurality of holes formed in the first filter cloth 31 and the first conveyor belt 32, and the gypsum slurry is dehydrated. The gypsum P generated by dehydrating the gypsum slurry on the first filter cloth 31 falls from the downstream end of the first conveyor belt 32 and is discharged to the outside of the first gypsum separator 3.

[0023] The second gypsum separator 4 has a configuration similar to that of the first gypsum separator 3. The second gypsum separator 4 may be a backup machine for the first gypsum separator 3 that is driven when the first gypsum separator 3 stops.

[0024] 3, the second gypsum separator 4 further includes a second upstream drum 43A arranged upstream in the second conveying direction and configured to be rotatably supported, a second downstream drum 43B arranged downstream in the second conveying direction and configured to be rotatably supported, and a second motor 44 mechanically connected to the second downstream drum 43B and configured to rotationally drive the second downstream drum 43B. The second downstream drum 43B is arranged downstream of the second upstream drum 43A in the second conveying direction.

[0025] The second conveyor belt 42 is an endless belt made of a rubber (elastic) sheet. The second conveyor belt 42 is wound around the second upstream drum 43A and the second downstream drum 43B and is tensioned between the second upstream drum 43A and the second downstream drum 43B.

[0026] The second filter cloth 41 is an endless belt-like piece of breathable sheet made of resin such as polyester or polypropylene. The second filter cloth 41 has a supported portion 411 in a part of its length that is superimposed on the upper surface 421 of the second conveyor belt 42. The supported portion 411 is supported by the second conveyor belt 42 so as to be able to move freely together with the second conveyor belt 42 in the second conveying direction.

[0027] By driving the second motor 44, the second upstream drum 43A and the second downstream drum 43B are rotationally driven, and the second conveyor belt 42 moves in a circular motion. As the second conveyor belt 42 moves in a circular motion, the upper surface 421 of the second conveyor belt 42 and the supported portion 411 of the second filter cloth 41 run downstream in the second conveyor direction.

[0028] A plurality of holes for allowing moisture to pass through are formed in the second filter cloth 41 and the second conveyor belt 42. When the gypsum slurry placed on the second filter cloth 41 is conveyed together with the second filter cloth 41 by the second conveyor belt 42, the gypsum slurry is dehydrated as moisture (filtrate) passes through the plurality of holes formed in the second filter cloth 41 and the second conveyor belt 42. The gypsum produced by dehydrating the gypsum slurry on the second filter cloth 41 falls from the downstream end of the second conveyor belt 42 and is discharged to the outside of the second gypsum separator 4.

[0029] (1st measuring device, 2nd measuring device, 1st corridor) As shown in FIG. 1 , the gypsum dewatering system 1 includes at least one (in the illustrated example, multiple) first measuring device 11 arranged on the second gypsum separator 4 side of the first gypsum separator 3 in the second direction, at least one (in the illustrated example, multiple) second measuring device 12 arranged on the first gypsum separator 3 side of the second gypsum separator 4 in the second direction, and a first walkway 51 having a first floor surface 52 extending along the first direction between the first gypsum separator 3 and the second gypsum separator 4.

[0030] Each of the first measuring devices 11 is configured to measure the state of the first gypsum separator 3. The first measuring devices 11 may include, for example, a pressure gauge 112, a flow meter 113, etc., which are provided in a first air supply passage 111 for supplying air, which is a working fluid, to pneumatic devices (e.g., pneumatic valves) provided in the first gypsum separator 3.

[0031] Each of the second measuring devices 12 is configured to measure the state of the second gypsum separator 4. The second measuring devices 12 may include, for example, a pressure gauge 122, a flow meter 123, etc., which are provided in a second air supply passage 121 for supplying air, which is a working fluid, to pneumatic devices (e.g., pneumatic valves) provided in the second gypsum separator 4.

[0032] 2, the first floor surface 52 is provided vertically above a foundation floor surface 101 on which the first gypsum separator 3 and the second gypsum separator 4 are installed. The building 10 has a foundation floor surface 101. The first floor surface 52 is provided at a height position that is 1.5 m or more below the upper surface 321 of the first conveyor belt 32 so that an inspector standing on the first floor surface 52 can visually check the upper surface 321 of the first conveyor belt 32 and the upper surface 421 of the second conveyor belt 42.

[0033] The first floor surface 52 is provided at a position where an inspector standing on the first floor surface 52 can visually check the winding state of the first filter cloth 31 and the second filter cloth 41 and the state of the gypsum on the first filter cloth 31 and the second filter cloth 41. The first measuring device 11 and the second measuring device 12 are each provided at a position where they can be accessed (for example, seen or operated) by an inspector standing on the base floor surface 101 between the first gypsum separator 3 and the second gypsum separator 4. For example, the first measuring device 11 and the second measuring device 12 are each provided within a range where the distance (shortest distance) from the base floor surface 101 is 2 m or less. Furthermore, the first measuring device 11 and the second measuring device 12 are each provided at a height position below the first floor surface 52.

[0034] Fig. 4 is a schematic diagram of the first walkway 51, the second walkway 55, the connecting passage 57, and the elevator shaft 50 in one embodiment, taken along a first direction. Fig. 5 is a schematic diagram of the first walkway 51, the second walkway 55, the connecting passage 57, and the elevator shaft 50 as viewed from above in one embodiment.

[0035] As shown in Figure 4, the first walkway 51 further includes a plurality of first walkway side legs 53 that stand on the foundation floor surface 101 and support the first floor surface 52, and a pair of first handrail portions 54 that stand from both ends of the first floor surface 52 in the second direction and extend along the first direction.

[0036] As shown in FIGS. 4 and 5 , the gypsum dehydration system 1 further includes a hoistway 50 connecting the foundation floor surface 101 and the first walkway 51. An inspector can move from the foundation floor surface 101 to the first floor surface 52 through the hoistway 50. In the illustrated embodiment, one end of the hoistway 50 is connected to the end of the first floor surface 52 on the one side in the first direction, and extends obliquely downward from the one end toward the one side in the first direction. The other end of the hoistway 50 is connected to the foundation floor surface 101. The floor surface along which the inspector of the hoistway 50 passes may be stepped or sloped.

[0037] By providing a first walkway 51 having a first floor surface 52 between the first gypsum separator 3 and the second gypsum separator 4, the first walkway 51 serves as a shared facility for inspecting the first gypsum separator 3 and the second gypsum separator 4, thereby reducing the size of the gypsum dehydration system 1 compared to when dedicated walkways are provided for each of the gypsum separators 3 and 4. Furthermore, with the above configuration, an inspector can inspect both the first gypsum separator 3 and the second gypsum separator 4 from the first floor surface 52. The first gypsum separator 3 and the second gypsum separator 4 are inspected periodically. During this periodic inspection of the first gypsum separator 3 and the second gypsum separator 4, an inspector can stand on the first floor surface 52 and visually check the winding state of the first filter cloth 31 and the second filter cloth 41 and the state of the gypsum on the first filter cloth 31 and the second filter cloth 41. In contrast to this, when the dedicated walkway is provided, it is necessary to move between the walkways to inspect both the first gypsum separator 3 and the second gypsum separator 4. Therefore, according to the above configuration, the travel distance during inspection can be reduced compared to when a dedicated walkway is provided for each of the gypsum separators 3 and 4, thereby improving the maintainability of the gypsum dehydration system 1.

[0038] 1, the first floor surface 52 is located above the first conveyor belt 32 and the second conveyor belt 42. That is, the first floor surface 52 is located above the upper surface 321 of the first conveyor belt 32 and the upper surface 421 of the second conveyor belt 42.

[0039] By providing the first floor surface 52 above the first conveyor belt 32 and the second conveyor belt 42, an inspector standing on the first floor surface 52 can easily check the state of the gypsum slurry conveyed by the first conveyor belt 32 and the state of the gypsum slurry conveyed by the second conveyor belt 42. The inspector who checks the state of the gypsum slurry on the first floor surface 52 can quickly take action depending on the state of the gypsum slurry. Therefore, with the above configuration, the maintainability of the gypsum dewatering system 1 can be improved.

[0040] (Second corridor) 1, 4, and 5, the above-described gypsum dewatering system 1 further includes a second walkway 55 having a second floor surface 56 extending along the first direction above the first floor surface 52, and a connecting passage 57 connecting the first floor surface 52 and the second floor surface 56. An inspector can move from above the first floor surface 52 to above the second floor surface 56 through the connecting passage 57.

[0041] The second walkway 55 and the connecting passage 57 are each disposed between the first gypsum separator 3 and the second gypsum separator 4 in the second direction. The second floor surface 56 is provided at a height position that is at least 2 m above the first floor surface 52 so that an inspector can easily move on the first floor surface 52. The second floor surface 56 may include a floor surface 56A that is provided to protrude from the first floor surface 52 to the other side opposite to the one side in the first direction.

[0042] As shown in Figures 4 and 5, the second walkway 55 further includes a plurality of second walkway side legs 58 that stand on the foundation floor surface 101 or the first floor surface 52 and support the second floor surface 56, and a pair of second handrail portions 59 that stand on both ends of the second floor surface 56 in the second direction and extend along the first direction.

[0043] In the illustrated embodiment, one end of the communication passage 57 is connected to the end of the second floor surface 56 on the one side in the first direction, and extends obliquely downward from that end toward the one side in the first direction. The other end of the communication passage 57 is connected to the first floor surface 52. The floor surface on which the inspector of the communication passage 57 passes may be stepped or may be inclined like a slope.

[0044] 5, the other end of the communication passage 57 may be provided in the center of the first floor surface 52 in the second direction. In the illustrated embodiment, the first floor surface 52 includes a floor surface 52A on one side in the second direction (the first gypsum separator 3 side) of the communication passage 57 at the first direction position where the communication passage 57 is provided, through which an inspector can pass along the first direction. The first floor surface 52 includes a floor surface 52B on the other side in the second direction (the second gypsum separator 4 side) of the communication passage 57 at the first direction position where the communication passage 57 is provided, through which an inspector can pass along the first direction.

[0045] By providing the second floor surface 56 above the first floor surface 52, it becomes possible to inspect the first gypsum separator 3 and the second gypsum separator 4 not only from the first floor surface 52 but also from the second floor surface 56. Furthermore, by providing a communication passage 57 connecting the first floor surface 52 and the second floor surface 56, an inspector can easily move from the first floor surface 52 to the second floor surface 56 through the communication passage 57, thereby improving the maintainability of the gypsum dewatering system 1.

[0046] (Gypsum slurry supply line) Fig. 6 is a schematic view along a first direction of a building 10 in which a gypsum dehydration system 1 according to one embodiment is installed. Fig. 7 is a schematic view of the gypsum dehydration system 1 according to one embodiment as viewed from above the second floor surface 56. In some embodiments, the above-mentioned gypsum dehydration system 1 further includes a first gypsum slurry supply line 71 for sending the gypsum slurry from the flue gas desulfurization apparatus 2 to the first gypsum separator 3, and a second gypsum slurry supply line 72 for sending the gypsum slurry from the flue gas desulfurization apparatus 2 to the second gypsum separator 4, as shown in Figs. 3 and 7 .

[0047] An upstream end 711 of the first gypsum slurry supply line 71 is connected to the flue gas desulfurization apparatus 2, and gypsum slurry is introduced from the flue gas desulfurization apparatus 2 to the first gypsum slurry supply line 71. A downstream end 712 of the first gypsum slurry supply line 71 is provided above the supported portion 311 of the first filter cloth 31. The gypsum slurry from the flue gas desulfurization apparatus 2 is supplied onto the first filter cloth 31 from a gypsum slurry supply port provided at the downstream end 712.

[0048] An upstream end 721 of the second gypsum slurry supply line 72 is connected to the first gypsum slurry supply line 71, and gypsum slurry is introduced from the flue gas desulfurization apparatus 2 to the second gypsum slurry supply line 72. A downstream end 722 of the second gypsum slurry supply line 72 is provided above the supported portion 411 of the second filter cloth 41. The gypsum slurry from the flue gas desulfurization apparatus 2 is supplied onto the second filter cloth 41 from a gypsum slurry supply port provided at the downstream end 722.

[0049] (Gypsum slurry flow control valve) 3 and 7 , the above-described gypsum dehydration system 1 further includes a first gypsum slurry flow rate control valve 73 configured to be able to adjust the flow rate of the gypsum slurry flowing downstream of a connection position P1 of the first gypsum slurry supply line 71 with the second gypsum slurry supply line 72, and a second gypsum slurry flow rate control valve 74 configured to be able to adjust the flow rate of the gypsum slurry flowing through the second gypsum slurry supply line 72. Note that the gypsum dehydration system 1 may further include a gypsum slurry pump 713 provided upstream of a connection position P1 of the first gypsum slurry supply line 71 with the second gypsum slurry supply line 72, and configured to send the gypsum slurry to the downstream side of the first gypsum slurry supply line 71.

[0050] 6 and 7 , the above-described second floor surface 56 is configured to allow an inspector to access the first gypsum slurry flow control valve 73 and the second gypsum slurry flow control valve 74. The first gypsum slurry flow control valve 73 and the second gypsum slurry flow control valve 74 are provided within a range where an inspector standing on the second floor surface 56 can manually operate them. For example, each of the first gypsum slurry flow control valve 73 and the second gypsum slurry flow control valve 74 is provided within a range where the shortest distance from the second floor surface 56 is 0.5 m or less. Furthermore, each of the first gypsum slurry flow control valve 73 and the second gypsum slurry flow control valve 74 is provided at a height position equal to or higher than the second floor surface 56 and equal to or lower than a height position 1.5 m above the second floor surface 56.

[0051] According to the above configuration, gypsum slurry can be sent from the flue gas desulfurization apparatus 2 to the first gypsum separator 3 through the first gypsum slurry supply line 71, and gypsum slurry can be sent from the flue gas desulfurization apparatus 2 to the second gypsum separator 4 through the second gypsum slurry supply line 72. By operating so that only one of the first gypsum slurry flow rate control valve 73 and the second gypsum slurry flow rate control valve 74 is opened, the flow rate of the gypsum slurry sent from the flue gas desulfurization apparatus 2 to each of the gypsum separators 3 and 4 can be stabilized. By stabilizing the flow rate of the gypsum slurry sent from the flue gas desulfurization apparatus 2 to each of the gypsum separators 3 and 4, the quality of the gypsum generated in each of the gypsum separators 3 and 4 can be improved.

[0052] Furthermore, according to the above configuration, an inspector can inspect the first gypsum slurry flow rate control valve 73 and the second gypsum slurry flow rate control valve 74 on the second floor surface 56, thereby improving the maintainability of the gypsum dewatering system 1.

[0053] (steam exhaust line, suction device) In some embodiments, as shown in FIGS. 6 and 7 , the above-described gypsum dehydration system 1 further includes a first steam discharge line 61 for discharging steam from the first gypsum separator 3, a second steam discharge line 62 for discharging steam from the second gypsum separator 4, and a suction device (e.g., an exhaust fan) 63 configured to generate a suction force for sucking the steam.

[0054] A downstream end 622 of the second steam discharge line 62 is connected to the first steam discharge line 61. The suction device 63 is connected to the first steam discharge line 61 downstream of the connection position P2 of the first steam discharge line 61 with the second steam discharge line 62. The suction force generated by the suction device 63 causes steam to be drawn into the first steam discharge line 61 from upstream ends 611A, 611B of the first steam discharge line 61 and sent downstream of the suction device 63 on the first steam discharge line 61. The suction force generated by the suction device 63 also causes steam to be drawn into the second steam discharge line 62 from upstream ends 621A, 621B of the second steam discharge line 62 and sent downstream of the suction device 63 on the first steam discharge line 61. The downstream end of the first steam discharge line 61 is located outside the building 10 and is open to the atmosphere.

[0055] In the illustrated embodiment, as shown in FIG. 6 , the above-described gypsum dehydration system 1 further includes: a first steam ejection device 35 having a first steam ejection section 351 capable of ejecting drying steam and arranged above the upper surface 321 of the first conveyor belt 32; a first steam ejection side hood 36 covering the first steam ejection section 351 and forming a steam ejection space 361 for ejecting drying steam between the first steam ejection section 351 and the supported section 311 of the first filter cloth 31; and a first steam retention side hood 37 covering the downstream end 712 of the first gypsum slurry supply line 71 and forming a steam retention space 371 between the first steam ejection section 351 and the supported section 311 of the first filter cloth 31 for retaining steam generated from the gypsum slurry.

[0056] The first steam discharge line 61 branches upstream of the connection position P2 with the second steam discharge line 62, forming two upstream ends 611A, 611B. Of the two upstream ends 611A, 611B, the upstream end 611A is connected to the first steam ejection hood 36 so as to communicate with the steam ejection space 361, and the other upstream end 611B is connected to the first steam retention hood 37 so as to communicate with the steam retention space 371. Steam is taken into the first steam discharge line 61 from the steam ejection space 361 or the steam retention space 371 by the suction force generated by the suction device 63. Note that in some other embodiments, the first steam discharge line 61 may have one upstream end, which may be connected to either the first steam ejection hood 36 or the first steam retention hood 37.

[0057] In the illustrated embodiment, as shown in FIG. 6 , the above-described gypsum dehydration system 1 further includes: a second steam ejection device 45 having a second steam ejection unit 451 that is arranged above the upper surface 421 of the second conveyor belt 42 and is capable of ejecting drying steam; a second steam ejection side hood 46 that covers the second steam ejection unit 451 and forms a steam ejection space 461 for ejecting drying steam between the second steam ejection unit 451 and the supported portion 411 of the second filter cloth 41; and a second steam retention side hood 47 that covers the downstream end 722 of the second gypsum slurry supply line 72 and forms a steam retention space 471 between the second steam ejection unit 451 and the supported portion 411 of the second filter cloth 41, for retaining steam generated from the gypsum slurry.

[0058] The second steam discharge line 62 branches into two on the upstream side, forming two upstream ends 621A, 621B. Of the two upstream ends 621A, 621B, one upstream end 621A is connected to the second steam ejection hood 46 so as to communicate with the steam ejection space 461, and the other upstream end 621B is connected to the second steam retention hood 47 so as to communicate with the steam retention space 471. Steam is drawn into the second steam discharge line 62 from the steam ejection space 461 or the steam retention space 471 by the suction force generated by the suction device 63. Note that in some other embodiments, the second steam discharge line 62 may have one upstream end, which may be connected to either the second steam ejection hood 46 or the second steam retention hood 47.

[0059] (Steam flow control valve) As shown in FIGS. 6 and 7 , the above-described gypsum dehydration system 1 further includes a first steam flow rate control valve 64 configured to be able to adjust the flow rate of steam flowing upstream of the connection position P2 of the first steam discharge line 61 with the second steam discharge line 62, and a second steam flow rate control valve 65 configured to be able to adjust the flow rate of steam flowing through the second steam discharge line 62.

[0060] 6 and 7 , the second floor surface 56 described above is configured to allow an inspector to access the suction device 63, the first steam flow control valve 64, and the second steam flow control valve 65. The suction device 63, the first steam flow control valve 64, and the second steam flow control valve 65 are provided within a range where an inspector standing on the second floor surface 56 can manually operate them. For example, the suction device 63, the first steam flow control valve 64, and the second steam flow control valve 65 are each provided within a range where the shortest distance from the second floor surface 56 is 0.5 m or less. Furthermore, the suction device 63, the first steam flow control valve 64, and the second steam flow control valve 65 are each provided at a height position equal to or higher than the second floor surface 56 and equal to or lower than a height position 1.5 m above the second floor surface 56.

[0061] According to the above configuration, the steam ejected from the first steam ejection portion 351 and the second steam ejection portion 451 reduces the viscosity of the adhering water contained in the gypsum slurry (gypsum cake) and heats and removes the moisture contained in the gypsum slurry, thereby reducing the moisture content of the gypsum. The suction device 63 allows steam to be discharged from the first gypsum separator 3 through the first steam discharge line 61, and also allows steam to be discharged from the second gypsum separator 4 downstream of the connection position P2 of the first steam discharge line 61 and through the second steam discharge line 62. Because the suction device 63 is shared by both the first gypsum separator 3 and the second gypsum separator 4, the gypsum dehydration system 1 can be made more compact than when a dedicated suction device is provided for each of the gypsum separators 3 and 4. Furthermore, by operating the gypsum dehydration system 1 so that only one of the first steam flow rate control valve 64 and the second steam flow rate control valve 65 is opened, the output required for the suction device 63 can be reduced, thereby reducing the size of the suction device 63.

[0062] Furthermore, according to the above configuration, an inspector can inspect the suction device 63, the first steam flow control valve 64, and the second steam flow control valve 65 on the second floor surface 56, thereby improving the maintainability of the gypsum dehydration system 1.

[0063] In some embodiments, the first gypsum separator 3 and the second gypsum separator 4 are arranged symmetrically about the center line CL of the first walkway 51 (a line passing through the center of the width of the first walkway 51) in the top view as shown in FIG. 1 . In this case, each device provided in the second gypsum separator 4 is arranged at a position in the first direction similar to that of the same type of device provided in the first gypsum separator 3. That is, the two gypsum separators 3 and 4, together with each device, are arranged in mirror symmetry across the central walkway 51. In this case, since the measuring instruments and adjustment valves face the walkway side, an inspector on the foundation floor surface 101, the first floor surface 52, or the second floor surface 56 between the first gypsum separator 3 and the second gypsum separator 4 can inspect, operate, and adjust the measuring instruments and adjustment valves of the other device simply by turning around. Since inspections of the same type of equipment in the first gypsum separator 3 and the second gypsum separator 4 can be performed consecutively, the maintainability of the gypsum dehydration system 1 can be improved.

[0064] 1, the first motor 34 described above is disposed at a downstream end of the first conveyor belt 32 and on the opposite side of the first gypsum separator 3 from the second gypsum separator 4 in the second direction. The second motor 44 described above is disposed at a downstream end of the second conveyor belt 42 and on the opposite side of the second gypsum separator 4 from the first gypsum separator 3 in the second direction.

[0065] According to the above configuration, by arranging the first motor 34 and the second motor 44, which are large equipment in the first gypsum separator 3 and the second gypsum separator 4, away from the first walkway 51, the distance between the first gypsum separator 3 and the second gypsum separator 4 and the first walkway 51 can be shortened, thereby making it possible to reduce the size of the gypsum dehydration system 1.

[0066] (Filter cloth cleaning device) In some embodiments, as shown in FIG. 3 , the above-described gypsum dehydration system 1 further includes a first filter cloth cleaning device 38 having a cleaning liquid supply unit 381 capable of supplying a cleaning liquid (e.g., water) to the first filter cloth 31 downstream of the downstream end 323 in the rotation direction of the first conveyor belt 32, and a second filter cloth cleaning device 48 having a cleaning liquid supply unit 481 capable of supplying a cleaning liquid (e.g., water) to the second filter cloth 41 downstream of the downstream end 423 in the rotation direction of the second conveyor belt 42.

[0067] (Dehydration equipment) In some embodiments, as shown in FIG. 3 , the above-described gypsum dehydration system 1 further includes a first dehydration device 39 configured to suction the gypsum slurry placed on the first filter cloth 31 from below and dehydrate the filtrate, and a second dehydration device 49 configured to suction the gypsum slurry placed on the second filter cloth 41 from below and dehydrate the filtrate.

[0068] The first dehydration device 39 is provided below the upper surface 321 of the first conveyor belt 32 and includes a first dehydration chamber 391 whose internal pressure is maintained at a negative pressure (a pressure lower than atmospheric pressure), a first vacuum pump 392, a first reduced pressure pipe 393 connecting the first dehydration chamber 391 and the first vacuum pump 392, and a first vacuum tank 394 provided in the first reduced pressure pipe 393. By driving the first vacuum pump 392, the pressure in the first dehydration chamber 391 is reduced to a negative pressure, and the moisture in the gypsum slurry placed on the first filter cloth 31 is sucked from below, thereby dehydrating the gypsum slurry.

[0069] The second dehydration device 49 includes a second dehydration chamber 491 provided below the upper surface 421 of the second conveyor belt 42 and having an internal pressure maintained at a negative pressure (a pressure lower than atmospheric pressure), a second vacuum pump 492, a second reduced pressure pipe 493 connecting the second dehydration chamber 491 and the second vacuum pump 492, and a second vacuum tank 494 provided in the second reduced pressure pipe 493. By driving the second vacuum pump 492, the pressure in the second dehydration chamber 491 is reduced to a negative pressure, and the moisture in the gypsum slurry placed on the second filter cloth 41 is sucked from below, thereby dehydrating the gypsum slurry.

[0070] 1, the above-mentioned first vacuum tank 394 is disposed on the opposite side of the first gypsum separator 3 from the second gypsum separator 4 in the second direction. The above-mentioned second vacuum tank 494 is disposed on the opposite side of the second gypsum separator 4 from the first gypsum separator 3 in the second direction.

[0071] According to the above configuration, by arranging the first vacuum tank 394 and the second vacuum tank 494, which are large pieces of equipment in the first gypsum separator 3 and the second gypsum separator 4, away from the first walkway 51, the distance between the first gypsum separator 3 and the second gypsum separator 4 and the first walkway 51 can be shortened, thereby making it possible to reduce the size of the gypsum dehydration system 1.

[0072] In some embodiments, in the above-described gypsum dehydration system 1, as shown in FIG. 1 , when the position of the upstream end 322 of the first conveyor belt 32 in the above-described first direction is defined as a 0% position and the position of the downstream end 323 of the first conveyor belt 32 in the first direction is defined as a 100% position, the position of the upstream end 422 of the second conveyor belt 42 in the first direction is located within a range of −10% to 10%, and the position of the downstream end 423 of the second conveyor belt 42 in the first direction is located within a range of 90% to 110%.

[0073] According to the above configuration, the positions of the upstream ends 322, 422 of the first conveyor belt 32 and the second conveyor belt 42 in the first direction are aligned, and the positions of the downstream ends 323, 423 of the first conveyor belt 32 and the second conveyor belt 42 in the first direction are aligned. In this case, the devices (second measuring device 12, second steam flow control valve 65, second gypsum slurry flow control valve 74, etc.) provided in the second gypsum separator 4 are arranged at positions similar to those of the same types of devices (first measuring device 11, first steam flow control valve 64, first gypsum slurry flow control valve 73, etc.) provided in the first gypsum separator 3. In other words, the two gypsum separators 3, 4, together with the devices, are arranged in mirror symmetry across the central walkway 51. In this case, since the measuring instruments and regulating valves face the walkway side, an inspector on the foundation floor 101, the first floor 52, or the second floor 56 between the first gypsum separator 3 and the second gypsum separator 4 can simply turn around to inspect, operate, and adjust the other measuring instruments and regulating valves. Since inspections of the same type of equipment in the first gypsum separator 3 and the second gypsum separator 4 can be carried out consecutively, the maintainability of the gypsum dewatering system 1 can be improved.

[0074] The following disclosure will be described using the first gypsum separator 3 as an example, but can be applied to the second gypsum separator 4 alone, and can be applied to both the first gypsum separator 3 and the second gypsum separator 4. Furthermore, the following disclosure can be applied not only to a gypsum dehydration system 1 including a plurality of gypsum separators 3 and 4, but also to a gypsum dehydration system including one gypsum separator.

[0075] (Chute section) Fig. 8 is a schematic view of the vicinity of a chute section 81 of a gypsum dewatering system 1 according to one embodiment, viewed from above. Fig. 9 is a schematic view of a panel 82 that constitutes the chute section 81 according to one embodiment. As shown in Fig. 8 , the gypsum dewatering system 1 according to some embodiments includes a first conveyor belt 32 configured to convey the gypsum slurry along the first direction toward the one side in the first direction, and the chute section 81 that surrounds a downstream end 323 of the first conveyor belt 32.

[0076] As shown in FIG. 8 , the chute section 81 includes a panel 82 extending in the second direction at a position across a gap (internal space 80) from the first conveyor belt 32 in the first direction. The panel 82 has an opening 83 formed therethrough. As shown in FIG. 8 , the chute section 81 further includes a door 84 attached to the panel 82 so as to be able to open and close the opening 83. The door 84 is configured to open the opening 83 by pulling the door 84 in a direction away from the first conveyor belt 32. The door 84 is also configured to close the opening 83 by pushing the door 84 in a direction toward the first conveyor belt 32. In the illustrated embodiment, the chute section 81 further includes a hinge 85 that is rotatable about a rotation axis in the vertical direction and that hinge-connects one end surface of the opening 83 to one end surface of the door 84 in the horizontal direction.

[0077] When the first conveyor belt 32 is driven with the opening 83 closed by the door 84 and gypsum falls from the downstream end 323 of the first conveyor belt 32, the scattered gypsum may adhere to the surface of the door 84 facing the internal space 80 or to the opening 83. When the door 84 is pulled in a direction away from the first conveyor belt 32, the gypsum adhering to the surface of the door 84 facing the internal space 80 or to the opening 83 may come out of the chute section 81. In this case, there is a risk that work will be required to remove the gypsum that has come out of the chute section 81.

[0078] (First sheet member) 8 and 9, the panel 82 further includes a flexible first sheet member 91 having an upper edge 92 attached to a first surface 821 facing the first conveyor belt 32 and hanging down to close the opening 83. As shown in FIG. 9, the first sheet member 91 is longer in the height direction (vertical direction) and width direction (second direction) than the opening 83.

[0079] 9, the illustrated embodiment further includes a pressing member 93 that sandwiches an upper edge 92 of the first sheet member 91 between the pressing member 93 and the first surface 821 of the panel 82, and a fastening member (a bolt in the illustrated example) 94 that detachably fastens the pressing member 93 and the first sheet member 91. As shown in FIG. 9, the pressing member 93 may be a metal plate-like member having a longitudinal direction along the second direction. The pressing member 93 is attached to the first surface 821 of the panel 82 above the opening 83 by the fastening member 94. Note that the attachment method is not limited to the illustrated embodiment as long as the upper edge 92 of the first sheet member 91 is attached to the first surface 821.

[0080] In the illustrated embodiment, the chute section 81 includes a first side panel 86 extending from an end of one side in the second direction of the panel 82 (the side toward the second gypsum separator 4) along the first direction toward the other side opposite the one side in the first direction, a second side panel 87 extending from an end of the other side in the second direction of the panel 82 (the side away from the second gypsum separator 4) along the first direction toward the other side in the first direction, and a back panel 88 connecting a tip of the first side panel 86 to a tip of the second side panel 87. The back panel 88 extends along the second direction on the other side in the first direction of the downstream end 323. The interior space 80 of the chute section 81 is defined by the panel 82, the first side panel 86, the second side panel 87, and the back panel 88.

[0081] According to the above configuration, by hanging the first sheet member 91 so as to close the opening 83, it is possible to prevent scattered gypsum from adhering to the opening 83 or the door 84. This makes it possible to prevent gypsum adhering to the opening 83 or the door 84 from leaking out of the chute section 81 when the door 84 is pulled in a direction away from the first conveyor belt 32. Furthermore, because the first sheet member 91 is flexible and has an upper edge 92 attached to the first surface 821 of the panel 82, by lifting up the first sheet member 91, it becomes possible to easily access equipment (e.g., the downstream end 323 of the first conveyor belt 32) present in the internal space 80 surrounded by the chute section 81 from outside the chute section 81.

[0082] In some embodiments, the first sheet member 91 described above is made of a light-transmitting material that allows the interior space 80 surrounded by the chute section 81 to be seen from the outside of the chute section 81.

[0083] According to the above configuration, by forming the first sheet member 91 from a light-transmitting material, an inspector can visually check the internal space 80 surrounded by the chute section 81 when the first sheet member 91 is closing the opening 83, and can check the status of the equipment (for example, the downstream end 323 of the first conveyor belt 32) present in the internal space 80. As a result, it is not necessary to roll up the first sheet member 91 to check the status of the equipment present in the internal space 80, so the period during which the first sheet member 91 does not close the opening 83 can be shortened, and scattered gypsum can be effectively prevented from adhering to the opening 83 or the door 84.

[0084] With the above configuration, it is possible to check the state of gypsum adhesion on the surface of the first sheet member 91 facing the internal space 80 from outside the chute section 81. If a large amount of gypsum has adhered to the surface of the first sheet member 91 facing the internal space 80, the adhered gypsum can be removed by hitting the first sheet member 91 from outside the chute section 81. Furthermore, if a large amount of gypsum has adhered to the surface of the first sheet member 91 facing the internal space 80, the first sheet member 91 can be easily replaced with a new one.

[0085] In some embodiments, as shown in FIG. 2, the chute section 81 has a lower end (one end) 811 connected to a floor opening 105 that penetrates vertically through the foundation floor 101 on which the first gypsum separator 3 is installed.

[0086] As shown in FIG. 2 , the building 10 has a floor portion 102 that extends horizontally and divides the interior of the building 10 into an upper portion and a lower portion. The interior of the building 10 is formed with an upper internal space 103 formed above the floor portion 102 and a lower internal space 104 formed below the floor portion 102. The floor portion 102 has an upper surface, a foundation floor surface 101, that faces the upper internal space 103. The gypsum dehydration system 1 described above is disposed in the upper internal space 103. The floor portion 102 is formed with a floor opening 105 that penetrates the foundation floor surface 101 vertically. Connecting the lower end 811 of the chute portion 81 to the floor opening 105 connects the internal space 80 of the chute portion 81 to the lower internal space 104. In the illustrated embodiment, the height of the lower internal space 104 is greater than the height of the upper internal space 103.

[0087] By connecting the lower end 811 of the chute section 81 to the floor opening 105, the gypsum dropping from the downstream end 323 of the first conveyor belt 32 can be guided below the base floor surface 101 through the floor opening 105. Specifically, the gypsum can be guided to the lower internal space 104 through the floor opening 105, and can be stored in the lower internal space 104. In this case, by guiding the gypsum below the base floor surface 101 through the floor opening 105, it is possible to prevent the gypsum from accumulating in the internal space 80 of the chute section 81, and therefore it is possible to effectively prevent the gypsum from leaking out of the chute section 81.

[0088] (Second sheet member) Fig. 10 is a schematic view along a first direction near the chute section 81 of the gypsum dewatering system 1 according to one embodiment. Fig. 11 is a schematic view along a second direction near the chute section 81 of the gypsum dewatering system 1 according to one embodiment. In some embodiments, as shown in Figs. 10 and 11 , the above-described first gypsum separator 3 further includes a plurality of legs 89 that support the first conveyor belt 32 above the base floor surface 101. Each of the plurality of legs 89 stands on the base floor surface 101.

[0089] As shown in FIGS. 10 and 11 , the above-described gypsum dewatering system 1 further includes at least one flexible second sheet member 95 that is suspended across at least two legs 89, 89 among the plurality of legs 89 and has an upper edge attached to the at least two legs 89, 89.

[0090] 10 , the multiple legs 89 include a first leg 89A arranged adjacent to the other side in the first direction with respect to the chute portion 81, a second leg 89B arranged adjacent to the other side in the first direction with respect to the first leg 89A, and a third leg 89C arranged adjacent to the other side in the first direction with respect to the second leg 89B. The at least one second sheet member 95 includes at least one of a downstream sheet member 95A spanning the first leg 89A and the second leg 89B and having upper edges attached to the first leg 89A and the second leg 89B, and an upstream sheet member 95B spanning the second leg 89B and the third leg 89C and having upper edges attached to the second leg 89B and the third leg 89C.

[0091] The downstream sheet member 95A may be detachably attached to the first leg 89A or the second leg 89B by, for example, hooking a hook portion 93A attached along the upper edge of the downstream sheet member 95A onto the first leg 89A or the second leg 89B. The upstream sheet member 95B may be detachably attached to the second leg 89B or the third leg 89C by, for example, hooking a hook portion 93B attached along the upper edge of the upstream sheet member 95B onto the second leg 89B or the third leg 89C.

[0092] In the embodiment shown in FIG. 11 , the multiple legs 89 include the first leg 89A and a fourth leg 89D disposed adjacent to the first leg 89A in the second direction. At least one second sheet member 95 includes a widthwise side sheet member 95C that spans the first leg 89A and the fourth leg 89D and has its upper edges attached to the first leg 89A and the fourth leg 89D. The widthwise side sheet member 95C may be detachably attached to the first leg 89A or the fourth leg 89D, for example, by hooking a hook portion 93C attached along its upper edge to the first leg 89A or the fourth leg 89D. Each of the multiple second sheet members 95 may be made of a visible, light-transmitting material.

[0093] According to the above configuration, the second sheet member 95 can prevent the gypsum slurry, gypsum, etc. from scattering outside the two leg portions 89, 89. The second sheet member 95 is flexible and has its upper edge attached to the two leg portions 89, 89. Therefore, by rolling up the second sheet member 95, it becomes easy to access the equipment provided in the first gypsum separator 3.

[0094] In this specification, expressions expressing relative or absolute arrangement such as "in a certain direction," "along a certain direction," "parallel," "orthogonal," "center," "concentric," or "coaxial" not only express such an arrangement strictly, 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 such as "identical," "equal," and "homogeneous" that indicate that something is in an equal state 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. Furthermore, in this specification, expressions representing shapes such as a rectangular shape or a cylindrical shape not only represent rectangular shapes or cylindrical shapes in the strict geometric sense, but also represent shapes including uneven portions, chamfered portions, etc., to the extent that the same effect can be obtained. Furthermore, in this specification, the expressions "comprise," "include," or "have" a component are not exclusive expressions that exclude the presence of other components.

[0095] The present disclosure is not limited to the above-described embodiments, but also includes modifications to the above-described embodiments and appropriate combinations of these modifications.

[0096] The contents of the above-described embodiments can be understood, for example, as follows.

[0097] 1) At least one embodiment of the gypsum dewatering system (1) according to the present disclosure includes: A gypsum dehydration system (1) for dehydrating gypsum slurry discharged from a flue gas desulfurization apparatus (2), a first gypsum separator (3) including a first conveyor belt (32) configured to convey the gypsum slurry placed on a first filter cloth (31) along a first direction toward one side of the first direction; a second gypsum separator (4) disposed at a position away from the first gypsum separator (3) in a second direction intersecting the first direction, the second gypsum separator (4) including a second conveyor belt (42) configured to convey the gypsum slurry along the first direction toward the one side of the first direction while the gypsum slurry is placed on a second filter cloth (41); At least one first measuring device (11) for measuring a state of the first gypsum separator (3), the at least one first measuring device (11) being arranged on the second gypsum separator (4) side in the second direction of the first gypsum separator (3); at least one second measuring device (12) for measuring a state of the second gypsum separator (4), the at least one second measuring device (12) being arranged on the first gypsum separator (3) side in the second direction of the second gypsum separator (4); and a first walkway (51) having a first floor surface (52) extending along the first direction between the first gypsum separator (3) and the second gypsum separator (4).

[0098] According to the above configuration 1), by providing a first walkway (51) having a first floor surface (52) between the first gypsum separator (3) and the second gypsum separator (4), the first walkway (51) becomes a shared facility for inspecting the first gypsum separator (3) and the second gypsum separator (4). This allows the gypsum dehydration system (1) to be more compact than when dedicated walkways are provided for each of the gypsum separators (3, 4). Furthermore, according to the above configuration 1), an inspector can inspect both the first gypsum separator (3) and the second gypsum separator (4) from the first floor surface (52). In contrast, if the dedicated walkway is provided, an inspector must move between the walkways to inspect both the first gypsum separator (3) and the second gypsum separator (4). Therefore, according to the above configuration 1), the distance traveled during inspection can be reduced compared to when a dedicated walkway is provided for each gypsum separator (3, 4), thereby improving the maintainability of the gypsum dewatering system (1).

[0099] 2) In some embodiments, the gypsum dewatering system (1) described in 1) above, a second walkway (55) having a second floor surface (56) extending along the first direction above the first floor surface (52); The storage tank further includes a communication passage (57) connecting the first floor surface (52) and the second floor surface (56).

[0100] According to the above configuration 2), by providing the second floor surface (56) above the first floor surface (52), it becomes possible to inspect the first gypsum separator (3) and the second gypsum separator (4) not only from the first floor surface (52) but also from the second floor surface (56). In addition, by providing a connecting passage (57) connecting the first floor surface (52) and the second floor surface (56), an inspector can easily move from the first floor surface (52) to the second floor surface (56) through the connecting passage (57), thereby improving the maintainability of the gypsum dewatering system (1).

[0101] 3) In some embodiments, the gypsum dehydration system (1) described in 2) above, a first steam discharge line (61) for discharging steam from the first gypsum separator (3); a second steam discharge line (62) for discharging steam from the second gypsum separator (4), the second steam discharge line (62) having a downstream end (622) connected to the first steam discharge line (61); a suction device (63) connected to the first vapor discharge line (61) downstream of a connection position (P2) between the first vapor discharge line (61) and the second vapor discharge line (62); a first steam flow rate control valve (64) configured to adjust the flow rate of the steam flowing on an upstream side of the connection position (P2) of the first steam discharge line (61) with the second steam discharge line (62); a second steam flow rate control valve (65) configured to adjust the flow rate of the steam flowing through the second steam discharge line (62), The second floor surface (56) is configured to allow an inspector to access the suction device (63), the first steam flow rate adjustment valve (64), and the second steam flow rate adjustment valve (65).

[0102] According to the configuration of 3), the suction device (63) can discharge steam from the first gypsum separator (3) through the first steam discharge line (61), and can also discharge steam from the second gypsum separator (4) downstream of the connection position (P2) of the first steam discharge line (61) and through the second steam discharge line (62). Since the suction device (63) serves both the first gypsum separator (3) and the second gypsum separator (4), the gypsum dehydration system (1) can be made more compact than when a dedicated suction device is provided for each of the gypsum separators (3, 4). Furthermore, by operating the suction device (63) so that only one of the first steam flow rate control valve (64) and the second steam flow rate control valve (65) is opened, the output required for the suction device (63) can be reduced, thereby making it possible to make the suction device (63) more compact.

[0103] Furthermore, according to the above configuration 3), an inspector can inspect the suction device (63), the first steam flow control valve (64), and the second steam flow control valve (65) on the second floor surface (56), thereby improving the maintainability of the gypsum dehydration system (1).

[0104] 4) In some embodiments, the gypsum dehydration system (1) described in 2) or 3) above, a first gypsum slurry supply line (71) for sending the gypsum slurry from the flue gas desulfurization apparatus (2) to the first gypsum separator (3); a second gypsum slurry supply line (72) for sending the gypsum slurry from the flue gas desulfurization apparatus (2) to the second gypsum separator (4), the second gypsum slurry supply line (72) having an upstream end (721) connected to the first gypsum slurry supply line (71); a first gypsum slurry flow rate control valve (73) configured to be able to adjust a flow rate of the gypsum slurry flowing downstream of a connection position (P1) of the first gypsum slurry supply line (71) with the second gypsum slurry supply line (72); a second gypsum slurry flow rate control valve (74) configured to be able to adjust the flow rate of the gypsum slurry flowing through the second gypsum slurry supply line (72), The second floor surface (56) was configured to allow an inspector to access the first gypsum slurry flow rate adjustment valve (73) and the second gypsum slurry flow rate adjustment valve (74).

[0105] According to the above configuration 4), the gypsum slurry can be sent from the flue gas desulfurization apparatus (2) to the first gypsum separator (3) through the first gypsum slurry supply line (71), and the gypsum slurry can be sent from the flue gas desulfurization apparatus (2) to the second gypsum separator (4) through the second gypsum slurry supply line (72). By operating the flue gas desulfurization apparatus (2) so that only one of the first gypsum slurry flow rate control valve (73) and the second gypsum slurry flow rate control valve (74) is opened, the flow rate of the gypsum slurry sent from the flue gas desulfurization apparatus (2) to each of the gypsum separators (3, 4) can be stabilized. By stabilizing the flow rate of the gypsum slurry sent from the flue gas desulfurization apparatus (2) to each of the gypsum separators (3, 4), the quality of the gypsum produced in each of the gypsum separators (3, 4) can be improved.

[0106] Furthermore, according to the above configuration 4), an inspector can inspect the first gypsum slurry flow control valve (73) and the second gypsum slurry flow control valve (74) on the second floor surface (56), thereby improving the maintainability of the gypsum dewatering system (1).

[0107] 5) In some embodiments, the gypsum dewatering system (1) according to any one of 1) to 4) above, the first gypsum separator (3) further includes a first motor (34) for driving the first conveyor belt (32), the first motor (34) being arranged at a downstream end of the first conveyor belt (33) and on an opposite side of the first gypsum separator (3) to the second gypsum separator (4) in the second direction, The second gypsum separator (4) further includes a second motor (44) for driving the second conveyor belt (42), the second motor (44) being arranged at a downstream end of the second conveyor belt (42) and on the opposite side of the second gypsum separator (4) to the first gypsum separator (3) in the second direction.

[0108] According to the configuration of 5), the first motor (34) and the second motor (44), which are large equipment in the first gypsum separator (3) and the second gypsum separator (4), are arranged away from the first walkway (51). This reduces the distance between the first gypsum separator (3) and the second gypsum separator (4) and the first walkway (51), thereby reducing the size of the gypsum dehydration system (1).

[0109] 6) In some embodiments, the gypsum dewatering system (1) according to any one of 1) to 5) above, The first floor surface (52) is located above the first conveyor belt (32) and the second conveyor belt (42).

[0110] According to the above configuration 6), by providing the first floor surface (52) above the first conveyor belt (32) and the second conveyor belt (42), an inspector standing on the first floor surface (52) can easily check the state of the gypsum slurry conveyed by the first conveyor belt (32) and the state of the gypsum slurry conveyed by the second conveyor belt (42). Having checked the state of the gypsum slurry on the first floor surface (52), the inspector can quickly take action depending on the state of the gypsum slurry. Thus, according to the above configuration 6), the maintainability of the gypsum dewatering system (1) can be improved.

[0111] 7) In some embodiments, the gypsum dewatering system (1) according to any one of 1) to 6) above, The position of the upstream end (322) of the first conveyor belt (32) in the first direction is defined as a 0% position, When the position of the downstream end (323) of the first conveyor belt (32) in the first direction is defined as a 100% position, the upstream end (422) of the second conveyor belt (42) is positioned within a range of −10% to 10% in the first direction; The downstream end (423) of the second transport belt (42) is positioned within a range of 90% to 110% in the first direction.

[0112] According to the above configuration 7), the positions of the upstream ends (322, 422) of the first conveyor belt (32) and the second conveyor belt (42) in the first direction are aligned, and the positions of the downstream ends (323, 423) of the first conveyor belt (32) and the second conveyor belt (42) in the first direction are aligned. In this case, the devices (second measuring device 12, second steam flow control valve 65, second gypsum slurry flow control valve 74, etc.) provided in the second gypsum separator (4) are arranged at positions in the first direction similar to those of the same types of devices (first measuring device 11, first steam flow control valve 64, first gypsum slurry flow control valve 73, etc.) provided in the first gypsum separator (3). In this case, an inspector can continuously inspect the same type of equipment of the first gypsum separator (3) and the second gypsum separator (4) on the foundation floor surface (101), the first floor surface (52), or the second floor surface (56) between the first gypsum separator (3) and the second gypsum separator (4), thereby improving the maintainability of the gypsum dehydration system (1).

[0113] 8) In some embodiments, the gypsum dewatering system (1) according to any one of 1) to 7) above, The first gypsum separator (3) further includes a chute section (81) surrounding a downstream end (323) of the first conveyor belt (32). The chute section (81) a panel (82) extending along the second direction at a position across a gap (internal space 80) from the first conveyor belt (32) in the first direction, the panel (82) having an opening (83) penetrating the panel (82); a door (84) attached to the panel (82) so as to be able to open and close the opening (83), the door (84) being configured to open the opening (83) by pulling the door (84) in a direction away from the first conveyor belt (32); The gypsum dehydration system (1) comprises: The panel (82) further includes a first flexible sheet member (91) having an upper edge (92) attached to a first surface (821) facing the first conveyor belt (32) and hanging down to close the opening (83).

[0114] According to the above configuration 8), by hanging the first sheet member (91) so as to close the opening (83), it is possible to prevent scattered gypsum from adhering to the opening (83) and the door (84). This prevents the gypsum adhering to the opening (83) and the door (84) from leaking out of the chute section (81) when the door (84) is pulled away from the first conveyor belt (32). Furthermore, since the first sheet member (91) is flexible and has its upper edge (92) attached to the first surface (821) of the panel (82), by lifting up the first sheet member (91), it becomes possible to easily access, from outside the chute section (81), devices (e.g., the downstream end 323 of the first conveyor belt 32) present in the internal space (80) enclosed by the chute section (81).

[0115] 9) In some embodiments, the gypsum dehydration system (1) described in 8) above, The first sheet member (91) is made of a light-transmitting material that allows the interior space (80) surrounded by the chute portion (81) to be seen from the outside of the chute portion (81).

[0116] According to the above configuration 9), by forming the first sheet member (91) from a light-transmitting material, an inspector can visually check the internal space (80) surrounded by the chute section (81) when the first sheet member (81) is closing the opening (83), and can check the status of the equipment present in the internal space (80) (for example, the downstream end 323 of the first conveyor belt 32). As a result, it is not necessary to lift up the first sheet member (91) to check the status of the equipment present in the internal space (80). This shortens the period during which the first sheet member (91) does not close the opening (83), and effectively prevents scattered gypsum from adhering to the opening (83) and the door (84).

[0117] 10) In some embodiments, the gypsum dehydration system (1) according to 8) or 9) above, One end (811) of the chute section (81) is connected to a floor opening (105) that penetrates vertically through a foundation floor (101) on which the first gypsum separator (3) is installed.

[0118] According to the configuration of 10), by connecting one end (811) of the chute section (81) to the floor opening (105), the gypsum dropping from the downstream end (323) of the first conveyor belt (32) can be guided below the base floor surface (101) through the floor opening (105). In this case, leakage of the gypsum outside the chute section (81) can be effectively prevented.

[0119] 11) In some embodiments, the gypsum dewatering system (1) according to any one of 1) to 10) above, The first gypsum separator (3) further includes a plurality of legs (89) that support the first conveyor belt (32), The gypsum dehydration system (1) comprises: The device further includes a flexible second sheet member (95) that spans at least two of the plurality of leg portions (89, 89) and has an upper edge attached to the at least two leg portions (89, 89).

[0120] According to the configuration of 11), the second sheet member (95) can prevent the gypsum slurry, gypsum, and the like from scattering outside the two leg portions (89, 89). The second sheet member (95) is flexible, and its upper edge is attached to the two leg portions (89, 89). Therefore, by lifting up the second sheet member (95), the devices provided in the first gypsum separator (3) can be easily accessed. [Explanation of symbols]

[0121] 1 Gypsum dehydration system 2 Flue gas desulfurization equipment 3 1st gypsum separator 4 2nd gypsum separator 10 Building 11 First Measuring Instrument 12 Second measuring device 31 First filter cloth 32 First conveyor belt 33A First upstream drum 33B First downstream drum 34 First motor 35 First Steam Jet Device 36 No. 1 steam outlet hood 37 First steam retention side hood 38 First filter cloth cleaning device 39 1st dehydration device 41 Second filter cloth 42 Second conveyor belt 43A Second upstream drum 43B Second downstream drum 44 Second motor 45 Second Steam Jet Device 46 Second steam outlet hood 47 Second steam retention side hood 48 Second filter cloth cleaning device 49 Second dehydration device 50 Elevator 51 First Corridor 52 1st floor 53 First walkway leg 54 First handrail section 55 Second Corridor 56 Second floor 57 Connecting Passage 58 Second walkway leg 59 Second handrail section 61 First steam discharge line 62 Second steam discharge line 63 Suction device 64 No. 1 steam flow control valve 65 Second steam flow control valve 71 No. 1 Gypsum Slurry Supply Line 72 No. 2 gypsum slurry supply line 73 No. 1 gypsum slurry flow control valve 74 No. 2 gypsum slurry flow control valve 80 Interior Space 81 Shooting Club 82 Panels 83 Aperture 84 Doors 85 hinges 86 First side panel 87 Second side panel 88 Rear Panel 89 Legs 91 first sheet member 92 Upper edge 93 Pressing member 93A, 93B, 93C Latch part 94 Fastening members 95 Second sheet member 101 Foundation floor surface 102 Floor section 103 Upper interior space 104 Lower interior space 105 Floor opening CL center line P plaster P1, P2 connection position

Claims

1. A gypsum dehydration system for dehydrating gypsum slurry discharged from a flue gas desulfurization apparatus, a first gypsum separator including a first conveyor belt configured to convey the gypsum slurry on a first filter cloth along a first direction toward one side of the first direction; a second gypsum separator disposed at a position spaced apart from the first gypsum separator in a second direction intersecting the first direction, the second gypsum separator including a second conveyor belt configured to convey the gypsum slurry on a second filter cloth along the first direction toward the one side of the first direction; At least one first measuring device for measuring a state of the first gypsum separator, the at least one first measuring device being arranged on the second gypsum separator side in the second direction; At least one second measuring device for measuring a state of the second gypsum separator, the at least one second measuring device being arranged on a side of the second gypsum separator closer to the first gypsum separator in the second direction; a first walkway having a first floor surface extending along the first direction between the first gypsum separator and the second gypsum separator; Gypsum dewatering system.

2. a second walkway having a second floor surface extending along the first direction above the first floor surface; Further provided is a communication passageway connecting the first floor surface and the second floor surface. The gypsum dewatering system of claim 1 .

3. a first steam discharge line for discharging steam from the first gypsum separator; a second steam discharge line for discharging steam from the second gypsum separator, the second steam discharge line having a downstream end connected to the first steam discharge line; a suction device connected to the first vapor discharge line downstream of a connection position between the first vapor discharge line and the second vapor discharge line; a first steam flow rate regulating valve configured to adjust a flow rate of the steam flowing upstream of the connection position of the first steam discharge line with the second steam discharge line; a second steam flow rate regulating valve configured to be able to adjust the flow rate of the steam flowing through the second steam discharge line, the second floor surface is configured to allow an inspector to access the suction device, the first steam flow rate control valve, and the second steam flow rate control valve. The gypsum dewatering system according to claim 2 .

4. a first gypsum slurry supply line for sending the gypsum slurry from the flue gas desulfurization apparatus to the first gypsum separator; a second gypsum slurry supply line for sending the gypsum slurry from the flue gas desulfurization apparatus to the second gypsum separator, the second gypsum slurry supply line having an upstream end connected to the first gypsum slurry supply line; a first gypsum slurry flow rate adjustment valve configured to be able to adjust a flow rate of the gypsum slurry flowing downstream of a connection position of the first gypsum slurry supply line with the second gypsum slurry supply line; a second gypsum slurry flow rate control valve configured to be able to adjust a flow rate of the gypsum slurry flowing through the second gypsum slurry supply line, The second floor surface is configured to allow an inspector to access the first gypsum slurry flow control valve and the second gypsum slurry flow control valve. The gypsum dewatering system according to claim 2 or 3.

5. the first gypsum separator further includes a first motor for driving the first conveyor belt, the first motor being disposed at a downstream end of the first conveyor belt and on an opposite side of the first gypsum separator from the second gypsum separator in the second direction, The second gypsum separator further includes a second motor for driving the second conveyor belt, the second motor being disposed at a downstream end of the second conveyor belt and on an opposite side of the second gypsum separator from the first gypsum separator in the second direction. The gypsum dewatering system according to any one of claims 1 to 3.

6. the first floor surface is located above the first conveyor belt and the second conveyor belt; The gypsum dewatering system according to any one of claims 1 to 3.

7. a position of an upstream end of the first conveyor belt in the first direction is defined as a 0% position; When the position of the downstream end of the first conveyor belt in the first direction is defined as a 100% position, a position of an upstream end of the second conveyor belt in the first direction is located within a range of −10% to 10%; a downstream end of the second conveyor belt in the first direction is positioned within a range of 90% to 110%; The gypsum dewatering system according to any one of claims 1 to 3.

8. The first gypsum separator further includes a chute portion surrounding a downstream end of the first conveyor belt. The chute section is a panel extending along the second direction at a position separated from the first conveyor belt by a gap in the first direction, the panel having an opening formed therethrough; a door attached to the panel so as to be able to open and close the opening, the door being configured to open the opening by pulling the door in a direction away from the first conveyor belt; The gypsum dewatering system includes: a first flexible sheet member attached at an upper edge to a first surface of the panel facing the first conveyor belt and hanging down to close the opening; The gypsum dewatering system according to any one of claims 1 to 3.

9. The first sheet member is made of a light-transmitting material that allows the internal space surrounded by the chute section to be visible from the outside of the chute section. The gypsum dewatering system of claim 8.

10. The chute portion has one end connected to a floor opening that penetrates the foundation floor surface on which the first gypsum separator is installed along the vertical direction. The gypsum dewatering system of claim 8.

11. the first gypsum separator further includes a plurality of legs supporting the first conveyor belt; The gypsum dewatering system includes: The device further includes a flexible second sheet member that is stretched across at least two of the plurality of legs and has an upper edge attached to the at least two legs. The gypsum dewatering system according to any one of claims 1 to 3.

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