Catalyst cleaning method, catalyst cleaning device, and program

Abstract

To solve the problem that vacuum water washing for removing ash adhering to a catalyst is troublesome, the water washing carried out to prevent activity degradation of the catalyst for removing nitrogen oxides and sulfur oxides from an exhaust gas generated by combustion of power generation fuel.SOLUTION: A catalyst cleaning method includes the steps for supporting a catalyst of a honeycomb structure above a cleaning liquid so that the open face of the catalyst is opposite to the liquid level of the cleaning liquid and immersing the catalyst in the cleaning liquid by moving the catalyst downward. In the step for immersing, immersing of the whole catalyst in the cleaning liquid requires 5 minutes or more after the catalyst touches the cleaning liquid.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present disclosure relates to a catalyst cleaning method, a catalyst cleaning apparatus, and a program.

Background Art

[0002] Patent Document 1 discloses a technique for improving the catalyst activity by preliminarily washing a denitration catalyst whose activity has decreased due to a silica-alumina-calcium sulfate-based poison substance with water and then washing and removing the poison substance using a mixed solution of an organic acid and a fluoride.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] A catalyst is used to remove nitrogen oxides (NO X ) and sulfur oxides (SO X ) from the exhaust gas generated during the combustion of power generation fuel. When the above catalyst is used, ash adheres to the exhaust gas, and the activity of removing nitrogen oxides and sulfur oxides decreases. In order to prevent such a decrease in the activity of the catalyst, it is required to remove the ash fixed to the catalyst. The present disclosure has been made to solve the above problems, and an object thereof is to provide a catalyst cleaning method, a catalyst cleaning apparatus, and a program that can easily remove the ash fixed to the catalyst.

Means for Solving the Problems

[0005] The catalyst cleaning method according to the present disclosure is Stored in the washing tank above the cleaning liquid, Having a plurality of cells a honeycomb-structured catalyst, The plurality of cells are open of the catalyst Lower part ofA step of supporting such that the opening surface faces the liquid level of the cleaning liquid, and the catalyst So that the cleaning liquid enters the cells from the opening surface at the lower part of the catalyst A step of lowering the catalyst downward and immersing it in the cleaning liquid, and in the step of immersing, the time from when the catalyst touches the cleaning liquid until the entire catalyst is immersed in the cleaning liquid is 5 minutes or more Within 2 hours, in the step of immersing, the catalyst is continuously lowered from the time it touches the cleaning liquid until the whole of the catalyst is immersed in the cleaning liquid, catalyst cleaning method is. The catalyst cleaning method according to the present disclosure is Stored in the washing tank above the cleaning liquid Having a plurality of cells A honeycomb-structured catalyst The plurality of cells are open of the catalyst Lower part of A step of supporting such that the opening surface faces the liquid level of the cleaning liquid, and the catalyst So that the cleaning liquid enters the cells from the opening surface at the lower part of the catalyst A step of lowering the catalyst downward and immersing it in the cleaning liquid, and In the step of immersing, a part of the catalyst is immersed in the cleaning liquid A step of keeping still First and After the first step, a second step of lowering the catalyst downward by a predetermined distance, and the first step and the second step are repeated until finally immersing the entire catalyst in the cleaning liquid It is a catalyst cleaning method . The catalyst cleaning device according to the present disclosure is Disposed above the cleaning liquid stored in the washing tank and having a plurality of cells A support device that moves the honeycomb-structured catalyst up and down while supporting it, and a control device that controls the support device. The control device, after the catalyst touches the cleaning liquid So that the opening surface at the lower part of the catalyst where the plurality of cells are open faces the liquid surface of the cleaning liquid until the entire catalyst is immersed in the cleaning liquid The catalyst is continuously lowered until the whole of the catalyst is immersed in the cleaning liquid The time Is is 5 minutes or more Within 2 hours and controls the support device so as to It is a catalyst cleaning device . The program according to the present disclosure is Having a plurality of cells A program for controlling a support device that moves a honeycomb-structured catalyst up and down while supporting it In the upper part of the cleaning liquid stored in the washing tank, supporting the honeycomb-structured catalyst so that the opening surface at the lower part of the catalyst where the plurality of cells are open corresponds to the liquid surface of the cleaning liquid The catalyst So that the cleaning liquid enters the cells from the opening surface at the lower part of the catalyst A step of lowering the catalyst downward and immersing it in the cleaning liquid And and executing the program. In the step of immersing, the time from when the catalyst touches the cleaning liquid The catalyst is continuously lowered until the whole of the catalyst is immersed in the cleaning liquid until the entire catalyst is immersed in the cleaning liquid is 5 minutes or more It is a program within 2 hours . The catalyst cleaning device according to the present disclosure is Disposed above the cleaning liquid stored in the washing tank, the A honeycomb-structured catalyst So that the opening surface at the lower part of the catalyst where the plurality of cells are open faces the liquid surface of the cleaning liquidA support device that moves the catalyst vertically while supporting it, and a control device that controls the support device, wherein the control device A first step of stationary with a part of the catalyst immersed in the cleaning liquid, and a second step of lowering the catalyst downward by a predetermined distance and stationary after the first step are repeated controls to immerse the entire catalyst in the cleaning liquid It is a catalyst cleaning device . The program according to the present disclosure Having a plurality of cells is a program for causing a control device of a support device that moves a catalyst vertically while supporting a honeycomb-structured catalyst In the upper part of the cleaning liquid stored in the washing tank, supporting the honeycomb-structured catalyst so that the opening surface at the lower part of the catalyst where the plurality of cells are open corresponds to the liquid surface of the cleaning liquid to execute a step of lowering the catalyst So that the cleaning liquid enters the cells from the opening surface at the lower part of the catalyst downward and immersing it in the cleaning liquid And and a step of stationary the catalyst The step of immersing is in a state where a part of the catalyst is in the cleaning liquid Immersed in and a step of immersing the entire catalyst in the cleaning liquid First . After the first step, a second step of lowering the catalyst downward by a predetermined distance, and repeating the first step and the second step to finally It is a program .

Advantages of the Invention

[0006] According to the catalyst cleaning method, catalyst cleaning device, and program of the present disclosure, ash adhering to the catalyst can be easily removed.

Brief Description of the Drawings

[0007]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Mode for Carrying Out the Invention

[0008] 〈First Embodiment〉 《Configuration of Catalyst Cleaning Device》 Hereinafter, embodiments will be described in detail with reference to the drawings. The catalyst cleaning device 100 according to the first embodiment is a device for removing ash adhering to the catalyst. FIG. 1 is a diagram showing an example of the catalyst 10 according to the first embodiment.

[0009] The catalyst 10 is a denitration catalyst for removing nitrogen oxides from the exhaust gas generated by the combustion of fuel. Examples of the above fuel include fuels used in boilers for power generation such as coal-fired power plants. Further, the catalyst 10 may be other catalysts such as a desulfurization catalyst for removing sulfur oxides.

[0010] The catalyst 10 has a honeycomb structure in which a plurality of cells 11 formed in a hollow polygonal column are filled in space. In the example of FIG. 1, the catalyst 10 has 64 cells 11, but the catalyst 10 may be composed of a different number of cells 11. The cross-section of the cell 11 shown in FIG. 1 is square, but the cross-section of the cell 11 may be different shapes such as triangular, pentagonal, rectangular, and hexagonal.

[0011] FIG. 2 is a schematic diagram showing an example of the configuration of the catalyst cleaning device 100 according to the first embodiment. The catalyst cleaning device 100 includes a first cleaning tank 21, a second cleaning tank 22, a support device 40, a liquid draining table 60, a hot air blower 70, and a control device 50. FIG. 2 is an example of the configuration of the catalyst cleaning device 100, and the catalyst cleaning device 100 may include one cleaning tank or a configuration including three or more cleaning tanks.

[0012] The first washing tank 21 stores a first washing liquid 31 for removing ash adhering to the cells 11 of the catalyst 10. Examples of the first washing tank 21 include an acrylic container. Examples of the first washing liquid 31 include a fluorine-based cleaning agent (for example, a chemical liquid containing an inorganic acid and a fluorine compound) and water. The first washing tank 21 is set, for example, directly below the rail 41 on which the support device 40 travels.

[0013] The second washing tank 22 stores a second washing liquid 32 for performing a finishing wash. Examples of the second washing tank 22 include an acrylic container. Examples of the second washing liquid 32 include a washing liquid composed of water or sulfamic acid. The second washing tank 22 is set, for example, directly below the rail 41 on which the support device 40 travels.

[0014] The support device 40 is a device that moves the catalyst 10 in the vertical and horizontal directions while supporting the catalyst 10. Examples of the support device 40 include a hoist that is attached to a rail 41 installed on the ceiling of the facility and can wind up and down a wire rope and move along the rail 41. The support device 40 supports the catalyst 10 so that the opening surface of the catalyst 10 faces the liquid level of the first washing liquid 31, and supports the catalyst 10 so that the opening surface of the catalyst 10 faces the liquid level of the second washing liquid 32.

[0015] The liquid draining stand 60 is a stand on which the catalyst 10 is placed to remove the second washing liquid 32 adhering to the catalyst 10. In addition to the above, the liquid draining stand 60 may be for removing water or the first washing liquid 31 adhering to the catalyst 10. The liquid draining stand 60 is set, for example, directly below the rail 41 on which the support device 40 travels.

[0016] The hot air blower 70 generates hot air to dry the catalyst 10. For example, the hot air blower 70 generates hot air toward the catalyst 10 present on the liquid draining stand 60 to dry the catalyst 10. The hot air blower 70 is set, for example, directly below the rail 41 on which the support device 40 travels.

[0017] The control device 50 is a device that receives an input from a user of the catalyst cleaning device 100 and controls the catalyst cleaning device 100 to immerse the catalyst 10 in the first cleaning liquid 31 and the second cleaning liquid 32 to clean the catalyst 10.

[0018] 《Configuration of the control device》 FIG. 3 is a schematic block diagram showing the configuration of the control device 50. The control device 50 includes a control unit 110 and an input reception unit 120.

[0019] The control unit 110 receives a signal from the input reception unit 120 and controls the support device 40 so that the catalyst 10 is immersed in the first cleaning liquid 31. Further, the control unit 110 receives an input from the input reception unit 120 and controls the support device 40 so that the catalyst 10 is immersed in the second cleaning liquid 32. Further, the control unit 110 controls to move the catalyst 10 to the liquid draining table 60 and the hot air blower 70.

[0020] The input reception unit 120 receives an input from a user of the catalyst cleaning device 100 and outputs a signal indicating the input to the control unit 110. Examples of the input reception unit 120 include a touch panel and an operation lever.

[0021] For example, when the input reception unit 120 is a touch panel, the input reception unit 120 receives an input on the display device such as an input of the position of the hoist on the rail 41 and an input of winding up and winding down of the wire rope. For example, when the input reception unit 120 is an operation lever, the input reception unit 120 includes a hoist operation lever capable of inputting the position of the hoist on the rail 41 and a wire rope operation lever capable of inputting winding up and winding down of the wire rope.

[0022] 《An example of the usage mode of the catalyst cleaning device》 FIG. 4 is a flowchart showing an example of the usage mode of the catalyst cleaning device 100.

[0023] The user of the catalyst cleaning device 100 checks the number of blockages on both opening surfaces of the catalyst 10 (step S1). By checking the number of blockages in step S1, the user of the catalyst cleaning device 100 can grasp the degree of ash clogging in the catalyst 10.

[0024] The user of the catalyst cleaning device 100 fixes the catalyst 10 to the support device 40 so that the support device 40 supports the catalyst 10 (step S2). The user of the catalyst cleaning device 100 fixes, for example, the wire rope of the support device 40 and the catalyst 10 using a nylon sling. The fixing of the catalyst 10 is performed such that when the support device 40 supports the catalyst 10, the liquid level of the first cleaning liquid 31 and the opening surface of the catalyst 10 face each other when the first cleaning liquid 31 is injected into the first cleaning tank 21.

[0025] The user of the catalyst cleaning device 100 injects the first cleaning liquid 31 into the first cleaning tank 21 and injects the second cleaning liquid 32 into the second cleaning tank 22 (step S3). The user of the catalyst cleaning device 100 may inject the first cleaning liquid 31 into the first cleaning tank 21 and the second cleaning liquid 32 into the second cleaning tank 22 in advance before step S1 and omit the step of step S3.

[0026] The user of the catalyst cleaning device 100 inputs to the input receiving unit 120 that after the support device 40 winds up the wire rope, the hoist of the support device 40 is moved above the first cleaning tank 21. That is, the input receiving unit 120 receives an input from the user of the catalyst cleaning device 100 that the catalyst cleaning device 100 lifts the catalyst 10 and moves it above the first cleaning tank 21 (step S4).

[0027] For example, in step S4, the user of the catalyst cleaning device 100 inputs to the touch panel, which is the input receiving unit 120, to wind up the wire rope to the maximum height. Then, the user of the catalyst cleaning device 100 inputs to the touch panel, which is the input receiving unit 120, to move the hoist above the first cleaning tank 21. In this case, the control device 50 stores in advance the position of the rail 41 corresponding to above the first cleaning tank 21.

[0028] For example, in step S4, the user of the catalyst cleaning device 100 uses the operation lever, which is the input receiving unit 120, to input that the wire rope is to be wound up and that the hoist is to be moved above the first cleaning tank 21.

[0029] The control unit 110 of the control device 50 receives the signal output by the input receiving unit 120 in step S4 and controls the support device 40 to lift and move the catalyst 10 above the first cleaning tank 21 (step S5).

[0030] For example, in step S5, the control unit 110 receives the signal output by the input receiving unit 120 in step S4 and controls to wind up the wire rope to the maximum height to lift the catalyst 10. After the lifting, the control unit 110 controls the hoist to move to the position of the rail 41 corresponding to above the first cleaning tank 21 stored in the control device 50.

[0031] The user of the catalyst cleaning device 100 inputs to the input receiving unit 120 to wind down the wire rope toward the first cleaning tank 21. That is, the input receiving unit 120 receives from the user of the catalyst cleaning device 100 an input to lower the catalyst 10 into the first cleaning tank 21 (step S6).

[0032] The control unit 110 receives the signal output by the input receiving unit 120 in step S6 and controls the support device 40 to lower the wire rope into the first cleaning tank 21 so that the catalyst 10 fixed to the wire rope is immersed in the first cleaning liquid 31 of the first cleaning tank 21 (step S7).

[0033] In the case of step S7, for example, in the control device 50, the speed of unwinding the wire rope is stored such that it takes 5 minutes for the catalyst 10 fixed to the wire rope to come into contact with the first cleaning liquid 31 in the first cleaning tank 21 until the entire catalyst 10 is immersed in the first cleaning liquid 31. The control unit 110 receives, in step S6, the signal output by the input reception unit 120 and controls the wire rope to unwind at the above speed based on the speed of unwinding the wire rope stored in the control device 50.

[0034] For example, in the case of step S7, in the control device 50, the speed of unwinding the wire rope may be stored such that it takes 5 minutes or more and within 2 hours from the time when the catalyst 10 fixed to the wire rope comes into contact with the first cleaning liquid 31 in the first cleaning tank 21 until the entire catalyst 10 is immersed in the first cleaning liquid 31. That is, the speed of unwinding the wire rope corresponding to a specific time within 5 minutes or more and within 2 hours may be stored in the control device 50. In step S7, the catalyst 10 is continuously lowered toward the first cleaning liquid 31.

[0035] When the operation lever is the input reception unit 120, steps S6 and S7 above may be manually performed by the user of the catalyst cleaning device 100.

[0036] In step S7, the catalyst 10 is lowered over 5 minutes from the time when it comes into contact with the first cleaning liquid 31 until the entire catalyst 10 is immersed in the first cleaning liquid 31. Since the catalyst 10 is slowly lowered into the first cleaning liquid 31, until the entire catalyst 10 is immersed, the upper opening surface of the catalyst 10 is not blocked, and the first cleaning liquid 31 gradually enters from the lower opening surface of the catalyst 10. The air existing between the entering first cleaning liquid 31, the opening surface, and the ash clogged in the cell 11 related to the opening surface is compressed, and the pressure of the air increases. On the other hand, until the entire catalyst 10 is immersed, since the upper opening surface of the catalyst 10 is not blocked, the air above the opening surface is not compressed by the first cleaning liquid 31 and is the same as the air pressure.

[0037] That is, since the catalyst 10 has come into contact with the first cleaning liquid 31, for the five minutes until the entire catalyst 10 is immersed in the first cleaning liquid 31, due to the pressure difference of air between the lower part and the upper part on the opening surface, the air trapped in the ash inside the catalyst 10 escapes from the opening surface at the upper part of the catalyst 10. Therefore, clogging of the catalyst 10 by ash is removed.

[0038] The user of the catalyst cleaning device 100 allows the immersion state of the catalyst 10 in step S7 to stand for, for example, one hour to maintain the state in which the catalyst 10 is immersed in the first cleaning liquid 31 (step S8).

[0039] The user of the catalyst cleaning device 100 inputs to the input receiving unit 120 an instruction to wind up the wire rope. That is, the input receiving unit 120 receives an input from the user of the catalyst cleaning device 100 to lift the catalyst 10 by the catalyst cleaning device 100 (step S9).

[0040] The control unit 110 receives the signal output by the input receiving unit 120 in step S9 and controls the support device 40 to wind up the wire rope to the maximum height. That is, the support device 40 lifts the catalyst 10 and moves it above the first cleaning tank 21 (step S10). By step S10, the catalyst 10 is in a state of not being immersed in the first cleaning liquid 31.

[0041] The user of the catalyst cleaning device 100 leaves the state of the catalyst 10 lifted in step S10 as it is (step S11). By step S11, the liquid of the first cleaning liquid 31 on the catalyst 10 can be drained.

[0042] The user of the catalyst cleaning device 100 inputs to the input receiving unit 120 an instruction to move the hoist of the support device 40 to the position of the rail 41 corresponding to the second cleaning tank 22. That is, the input receiving unit 120 receives an input from the user of the catalyst cleaning device 100 to move the catalyst 10 above the second cleaning tank 22 by the support device 40 (step S12).

[0043] The control unit 110 receives, according to step S12, the signal output by the input reception unit 120, and controls the support device 40 to move the hoist to the position of the rail 41 corresponding to the second cleaning tank 22. In this case, the position of the rail 41 corresponding to the second cleaning tank 22 is stored in advance by the control device 50. Under the control of the control unit 110, the support device 40 moves the catalyst 10 above the second cleaning tank 22 (step S13).

[0044] The user of the catalyst cleaning device 100 inputs to the input reception unit 120 to wind down the wire rope toward the second cleaning tank 22. That is, the input reception unit 120 receives an input from the user of the catalyst cleaning device 100 to lower the catalyst 10 into the second cleaning tank 22 (step S14).

[0045] According to step S14, the control unit 110 receives the signal output by the input reception unit 120, and controls the support device 40 to lower the wire rope into the second cleaning tank 22 so that the catalyst 10 fixed to the wire rope is immersed in the second cleaning liquid 32 of the second cleaning tank 22 (step S15).

[0046] In the case of step S15, for example, in the control device 50, the winding-down speed of the wire rope is stored such that it takes 5 minutes for the catalyst 10 fixed to the wire rope to be immersed in the second cleaning liquid 32 of the second cleaning tank 22 after the catalyst 10 touches the second cleaning liquid 32. According to step S14, the control unit 110 receives the signal output by the input reception unit 120, and controls the wire rope to be wound down at the above-mentioned speed based on the winding-down speed of the wire rope stored by the control device 50.

[0047] For example, in the case of step S15, the control device 50 may store the speed of lowering the wire rope such that, after the catalyst 10 fixed to the wire rope touches the second cleaning liquid 32 in the second cleaning tank 22 and until the entire catalyst 10 is immersed in the second cleaning liquid 32, it takes 5 minutes or more and within 2 hours. That is, the speed of lowering the wire rope related to the specific time of 5 minutes or more and within 2 hours may be stored in the control device 50. By step S15, the catalyst 10 is continuously lowered toward the second cleaning liquid 32.

[0048] When the operation lever is the input receiving unit 120, steps S14 and S15 above may be manually performed by the user of the catalyst cleaning device 100.

[0049] By step S15, the catalyst 10 is lowered over 5 minutes from the time it touches the second cleaning liquid 32 until the entire catalyst 10 is immersed in the second cleaning liquid 32. Since the catalyst 10 is slowly lowered into the second cleaning liquid 32, the second cleaning liquid 32 penetrates into the catalyst 10.

[0050] The user of the catalyst cleaning device 100 leaves the immersion state of the catalyst 10 in step S15 to maintain the state where the catalyst 10 is immersed in the second cleaning liquid 32 (step S16). The first cleaning liquid 31 adhering to the catalyst 10 is removed and reduced.

[0051] The user of the catalyst cleaning device 100 inputs to the input receiving unit 120 to wind up the wire rope of the support device 40. That is, the input receiving unit 120 of the catalyst cleaning device 100 receives an input from the user of the catalyst cleaning device 100 to lift the catalyst 10 by the support device 40 (step S17).

[0052] The control unit 110 receives the signal output by the input receiving unit 120 in step S17 and controls the support device 40 to wind up the wire rope (step S18). That is, by step S18, the support device 40 lifts the catalyst 10 by the control unit 110 and moves it above the second cleaning tank 22.

[0053] The user of the catalyst cleaning device 100 leaves the state of the catalyst 10 lifted in step S18 (step S19). By step S19, the liquid of the second cleaning liquid 32 of the catalyst 10 can be cut off.

[0054] The user of the catalyst cleaning device 100 inputs to the input receiving unit 120 the movement of the rail 41 corresponding to the position of the drain table 60 of the hoist of the support device 40 and the input indicating the unwinding of the wire rope. That is, the input receiving unit 120 of the catalyst cleaning device 100 receives an input from the user of the catalyst cleaning device 100 to move the catalyst 10 onto the drain table 60 and lower it to the drain table 60 (step S20).

[0055] The control unit 110 receives from the input receiving unit 120 a signal to move the catalyst 10 to the drain table 60, and controls the support device 40 to move to the position of the rail 41 corresponding to the position of the drain table 60 of the hoist and unwind the wire rope. In this case, the control device 50 stores the position of the rail 41 corresponding to the position of the drain table 60. The support device 40 is moved by the control of the control unit 110 to the position of the rail 41 corresponding to the position of the hoist and the drain table 60, and then the wire rope is unwound. Thereby, the catalyst 10 is moved to the drain table 60 (step S21).

[0056] [[ID=…]] The user of the catalyst cleaning device 100 leaves the catalyst 10 moved to the drain table 60 in step S21 (step S22). By leaving in step S22, the liquid of the first cleaning liquid 31 and the second cleaning liquid 32 attached to the catalyst 10 is cut off.

[0057] The user of the catalyst cleaning device 100 uses the hot air blower 70 to blow hot air onto the catalyst 10 to dry the catalyst 10 (step S23). By step S23, the liquid of the first cleaning liquid 31 and the second cleaning liquid 32 attached to the catalyst 10 is cut off.

[0058] The user of the catalyst cleaning device 100 checks the number of blockages on both sides of the opening surface of the catalyst 10 (step S24). By checking in step S24, the situation of ash removal in the catalyst 10 can be confirmed. When the number of blockages in step S24 is equal to or more than a certain number, the user of the catalyst cleaning device 100 can further remove more ash by immersing the catalyst 10 in the first cleaning liquid 31, the second cleaning liquid 32, or the like.

[0059] By the steps as described above, the user of the catalyst cleaning device 100 can remove the ash adhering to the catalyst 10.

[0060] 《Function and Effect》 The catalyst cleaning method according to the present disclosure includes a step of supporting the honeycomb-structured catalyst 10 above the cleaning liquid so that the opening surface of the catalyst 10 faces the liquid surface of the cleaning liquid, and a step of lowering the catalyst 10 downward to immerse it in the cleaning liquid. In the immersing step, the time from when the catalyst 10 touches the cleaning liquid until the whole of the catalyst 10 is immersed in the cleaning liquid is 5 minutes or more. With the above catalyst cleaning method, since the catalyst 10 is slowly lowered into the cleaning liquid, the cleaning liquid gradually penetrates from the lower opening surface of the catalyst 10 in a state where the upper opening surface of the catalyst 10 is not blocked. As a result, the air trapped in the ash inside the catalyst 10 escapes from the upper opening surface of the catalyst 10. Therefore, the user using the catalyst cleaning method can easily remove the ash adhering to the catalyst 10.

[0061] Further, in the immersing step of the catalyst cleaning method according to the present disclosure, the catalyst 10 is continuously lowered from when the catalyst 10 touches the cleaning liquid until the whole of the catalyst 10 is immersed in the cleaning liquid. As a result, since the catalyst 10 is slowly lowered into the cleaning liquid, the cleaning liquid gradually penetrates from the lower opening surface of the catalyst 10 in a state where the upper opening surface of the catalyst 10 is not blocked. Thereby, the air trapped in the ash inside the catalyst 10 escapes from the upper opening surface of the catalyst 10. Therefore, the user using the catalyst cleaning method can easily remove the ash adhering to the catalyst 10.

[0062] <Second Embodiment> The catalyst cleaning device 100 according to the second embodiment, similar to the catalyst cleaning device 100 according to the first embodiment, simply removes the ash adhering to the catalyst. The usage mode of the catalyst cleaning device 100 according to the first embodiment is a mode of continuously lowering the catalyst 10 into the cleaning liquid, while the usage mode of the catalyst cleaning device 100 according to the second embodiment is a mode of lowering the catalyst 10 into the cleaning liquid step by step. The configuration of the catalyst cleaning device 100 according to the second embodiment is the same as the configuration of the catalyst cleaning device 100 according to the first embodiment.

[0063] FIG. 5 is a flowchart showing an example of the usage mode of the catalyst cleaning device 100 according to the second embodiment. In the use of the catalyst cleaning device according to the second embodiment, the same processing as that from step S1 to step S5 in an example of the usage mode of the catalyst cleaning device 100 according to the first embodiment is performed.

[0064] The user of the catalyst cleaning device 100 inputs to the input receiving unit 120 an instruction to unwind the wire rope of the support device 40. That is, the input receiving unit 120 of the catalyst cleaning device 100 receives from the user of the catalyst cleaning device 100 an input instruction that the support device 40 lowers the catalyst 10 into the first cleaning tank 21 (step S31).

[0065] The control unit 110 receives the signal output by the input receiving unit 120 in step S31 and controls the support device 40 to unwind the wire rope toward the first cleaning tank 21. That is, the support device 40 unwinds the wire rope toward the first cleaning tank 21 under the control of the control unit 110. As a result, a part of the catalyst 10 is immersed in the first cleaning liquid 31 (step S32). For example, when the height of the catalyst 10 is 670 mm, 67 mm, which is 10% of the height, is immersed in the first cleaning liquid 31.

[0066] For example, based on information such as the height of the upper surface of the first cleaning liquid 31 stored in the control device 50, in step S32, the control unit 110 controls the support device 40 so that 67 mm from the lower part of the catalyst 10 is immersed in the first cleaning liquid 31.

[0067] The user of the catalyst cleaning device 100 leaves the partially immersed catalyst 10 as it is in the immersed state of step S32 (step S33). That is, a part of the catalyst 10 is stationary in a state of protruding from the first cleaning liquid 31. By leaving it in step S33, the ash inside the catalyst 10 is removed by the chemical reaction between the first cleaning liquid 31 and the ash inside the catalyst 10.

[0068] In steps S32 and S33, the first cleaning liquid 31 enters from the lower opening surface of the catalyst 10 with the upper opening surface of the catalyst 10 not blocked. The air existing between the entering first cleaning liquid 31, the ash clogged in the cell 11 related to the opening surface, and the first cleaning liquid 31 entering the opening surface is compressed, and the pressure of the air increases. On the other hand, since the upper opening surface of the catalyst 10 is not blocked, the air above the opening surface is not compressed by the first cleaning liquid 31 and is the same as the air pressure.

[0069] That is, due to the pressure difference of air between the lower part and the upper part at the opening surface, the air bitten into the ash inside the catalyst 10 escapes from the upper opening surface of the catalyst 10. Therefore, clogging of the catalyst 10 due to ash is removed.

[0070] The user of the catalyst cleaning device 100 repeats the steps from step S31 to step S33. For example, leave it for 5 minutes with 30% of the lower part of the catalyst 10 immersed in the first cleaning liquid 31, leave it for 5 minutes with 50% of the lower part of the catalyst 10 immersed in the first cleaning liquid 31, leave it for 5 minutes with 70% of the lower part of the catalyst 10 immersed in the first cleaning liquid 31, leave it for 5 minutes with 90% of the lower part of the catalyst 10 immersed in the first cleaning liquid 31, and leave it for 1 hour with the entire catalyst 10 immersed in the first cleaning liquid 31.

[0071] For example, in the above repetition, based on information such as the height of the upper surface of the first cleaning liquid 31 stored in the control device 50, the control unit 110 controls the support device 40 so that 30%, 50%, 70%, 90%, and 100% of the lower part of the catalyst 10 is immersed in the first cleaning liquid 31. The ratio from the lower part of the catalyst 10 to be immersed may be different ratios. For example, it may be 20%, 40%, 60%, 80%, or 100%.

[0072] Thereby, with the upper part of the catalyst 10 not blocked, a part of the catalyst 10 is immersed in the first cleaning liquid 31, so that air is removed from the upper part of the catalyst 10, and clogging of the catalyst 10 due to ash is removed.

[0073] After the above steps, the same steps as step S12 and step S13 in an example of the usage mode of the catalyst cleaning device 100 of the first embodiment are performed.

[0074] After step S12 and step S14, the user of the catalyst cleaning device 100 repeats the steps from step S31 to step S33 for the second cleaning liquid 32 as well. Step S34 is the same as step S31, step S35 is the same as step S32, and step S36 is the same as step S33.

[0075] For example, leave it for 5 minutes with 10% of the lower part of the catalyst 10 immersed in the second cleaning liquid 32, leave it for 5 minutes with 30% of the lower part of the catalyst 10 immersed in the second cleaning liquid 32, leave it for 5 minutes with 50% of the lower part of the catalyst 10 immersed in the second cleaning liquid 32, leave it for 5 minutes with 70% of the lower part of the catalyst 10 immersed in the second cleaning liquid 32, leave it for 5 minutes with 90% of the lower part of the catalyst 10 immersed in the second cleaning liquid 32, and leave it for 30 minutes with the entire catalyst 10 immersed in the second cleaning liquid 32. By the above steps, the first cleaning liquid 31 adhering to the catalyst 10 is removed and reduced.

[0076] After the repetition from step S34 to step S36 above, the same steps as those from step S20 to step S24 in an example of the usage mode of the catalyst cleaning device 100 of the first embodiment are performed.

[0077] By the steps as described above, the user of the catalyst cleaning device 100 can remove the ash adhering to the catalyst 10.

[0078] 《Function and Effect》 The catalyst cleaning method according to the present disclosure includes a step of supporting the honeycomb-structured catalyst 10 above the cleaning liquid so that the opening surface of the catalyst faces the liquid surface of the cleaning liquid, and a step of lowering the catalyst 10 downward to immerse it in the cleaning liquid, and a step of stationary with a part of the catalyst 10 protruding from the cleaning liquid, and after stationary, a step of immersing the whole catalyst in the cleaning liquid. Thereby, a part of the catalyst 10 immersed in the cleaning liquid allows the cleaning liquid to gradually penetrate from the lower opening surface of the catalyst 10 in a state where the upper opening surface of the catalyst 10 is not blocked. Thereby, the air trapped in the ash of a part of the immersed catalyst 10 escapes from the upper opening surface of the catalyst 10. Therefore, clogging due to ash of a part of the immersed catalyst 10 is removed.

[0079] 〈Other Embodiments〉 As described above, one embodiment has been described in detail with reference to the drawings, but the specific configuration is not limited to the above, and various design changes and the like are possible.

[0080] In the above embodiment, the user of the catalyst cleaning device 100 inputs to the catalyst cleaning device 100, the input receiving unit 120 receives the input, and the support device 40 moves the catalyst 10. In contrast, in other embodiments, a storage unit 130 is provided in the catalyst cleaning device 100, and the support device 40 operates based on the procedure stored in the storage unit. FIG. 6 is a schematic block diagram showing the configuration of the catalyst cleaning device 100 according to other embodiments.

[0081] Specifically, the control unit 110 controls the support device 40 that moves the honeycomb-structured catalyst 10 in the vertical and horizontal directions while supporting the catalyst 10 based on the procedure stored in the storage unit 130. That is, the control unit 110 controls the support device 40 so that the catalyst 10 is immersed in the cleaning liquid based on the procedure stored in the storage unit 130. The mode related to the immersion may be continuous as in the first embodiment or may be partially performed stepwise as in the second embodiment. The procedure is the operation information of the support device 40 recorded in time series and the like. Examples of the storage unit 130 include a hard disk and the like.

[0082] The support device 40 of the catalyst cleaning device 100 according to another embodiment immerses the catalyst 10 in the cleaning liquid based on the procedure stored in the storage unit 130. According to the above-described other embodiment, the user of the catalyst cleaning device 100 can immerse the catalyst 10 in the cleaning liquid without inputting to the catalyst cleaning device 100. Therefore, the user of the catalyst cleaning device 100 can more easily remove the ash of the catalyst 10.

[0083] In the above embodiment, the user of the catalyst cleaning device 100 may adjust the immersion time by observing the bubbles generated from the catalyst 10 immersed in the first cleaning liquid 31 or the second cleaning liquid 32. For example, the immersion time may be extended until the bubbles are generated.

[0084] 〈Computer Configuration〉 FIG. 7 is a schematic block diagram showing the configuration of a computer according to at least one embodiment. The computer 1100 includes a processor 1110, a main memory 1120, a storage 1130, and an interface 1140. The above-described catalyst cleaning device 100 is implemented in a computer 1100. And the operations of the above-described respective processing units are stored in a storage 1130 in the form of a program. The processor 1110 reads out the program from the storage 1130 and expands it in the main memory 1120, and executes the above processing according to the program. Also, the processor 1110 secures a storage area corresponding to each of the above-described storage units in the main memory 1120 according to the program.

[0085] The program may be for realizing a part of the functions to be exhibited by the computer 1100. For example, the program may exhibit functions by combination with other programs already stored in the storage 1130, or by combination with other programs implemented in other devices. In other embodiments, the computer 1100 may include a custom LSI (Large Scale Integrated Circuit) such as a PLD (Programmable Logic Device) in addition to or instead of the above configuration. Examples of PLDs include PAL (Programmable Array Logic), GAL (Generic Array Logic), CPLD (Complex Programmable Logic Device), and FPGA (Field Programmable Gate Array). In this case, part or all of the functions realized by the processor 1110 may be realized by the integrated circuit.

[0086] Examples of the storage 1130 include a magnetic disk, a magneto-optical disk, a semiconductor memory, etc. The storage 1130 may be an internal medium directly connected to the bus of the computer 1100, or an external medium connected to the computer via the interface 1140 or a communication line. Further, when this program is distributed to the computer 1100 via a communication line, the receiving computer 1100 may expand the program in the main memory 1120 and execute the above processing. In at least one embodiment, the storage 1130 is a non-transitory tangible storage medium.

[0087] Also, the program may be for realizing a part of the functions described above. Further, the program may be a so-called differential file (differential program) that realizes the above-described functions in combination with other programs already stored in the storage 1130.

[0088] <Supplementary Note> The catalyst cleaning device 100 described in each embodiment is understood as follows, for example.

[0089] (1) The catalyst cleaning method includes a step of supporting the honeycomb-structured catalyst 10 above the cleaning liquid such that the opening surface of the catalyst 10 faces the liquid surface of the cleaning liquid, and a step of lowering the catalyst 10 downward and immersing it in the cleaning liquids 31 and 32. In the immersing step, the time from when the catalyst 10 touches the cleaning liquids 31 and 32 until the entire catalyst 10 is immersed in the cleaning liquids 31 and 32 is 5 minutes or more.

[0090] Thereby, since the catalyst 10 is slowly lowered into the cleaning liquids 31 and 32, the cleaning liquids 31 and 32 gradually penetrate from the lower opening surface of the catalyst 10 in a state where the upper opening surface of the catalyst 10 is not blocked. As a result, the air trapped in the ash inside the catalyst 10 escapes from the upper opening surface of the catalyst 10. Therefore, the user using the catalyst cleaning method can remove the ash adhering to the catalyst 10.

[0091] (2) In the dipping step of the catalyst cleaning method, after the catalyst 10 touches the cleaning liquids 31 and 32, the catalyst 10 is continuously lowered until the entire catalyst 10 is immersed in the cleaning liquids 31 and 32.

[0092] As a result, since the catalyst 10 is slowly lowered into the cleaning liquids 31 and 32, the cleaning liquids 31 and 32 gradually penetrate from the lower opening surface of the catalyst 10 in a state where the upper opening surface of the catalyst 10 is not blocked. Thereby, the air trapped in the ash inside the catalyst 10 escapes from the upper opening surface of the catalyst 10. Therefore, the user using the catalyst cleaning method can remove the ash adhering to the catalyst 10.

[0093] (3) The catalyst cleaning method includes a step of supporting the honeycomb-structured catalyst 10 above the cleaning liquids 31 and 32 so that the opening surface of the catalyst faces the liquid surface of the cleaning liquid, and a step of lowering the catalyst 10 downward to immerse it in the cleaning liquids 31 and 32, and has a step of stationary in a state where a part of the catalyst 10 protrudes from the cleaning liquids 31 and 32, and after stationary, a step of immersing the entire catalyst 10 in the cleaning liquids 31 and 32.

[0094] As a result, a part of the catalyst 10 immersed in the cleaning liquids 31 and 32 allows the cleaning liquids 31 and 32 to gradually penetrate from the lower opening surface of the catalyst 10 in a state where the upper opening surface of the catalyst 10 is not blocked. Thereby, the air trapped in the ash of a part of the immersed catalyst 10 escapes from the upper opening surface of the catalyst 10. Therefore, clogging due to ash of a part of the immersed catalyst 10 is removed.

[0095] (4) The catalyst cleaning device 100 includes a support device 40 that moves the catalyst 10 in the vertical direction while supporting the honeycomb-structured catalyst 10, and a control device 50 that controls the support device 40. The control unit 110 controls the support device 40 so that the time from when the catalyst 10 touches the cleaning liquids 31 and 32 until the entire catalyst 10 is immersed in the cleaning liquids 31 and 32 is 5 minutes or more.

[0096] As a result, since the catalyst 10 is slowly lowered into the cleaning liquids 31 and 32, the cleaning liquids 31 and 32 gradually penetrate from the lower opening surface of the catalyst 10 without blocking the upper opening surface of the catalyst 10. Thereby, the air trapped in the ash inside the catalyst 10 escapes from the upper opening surface of the catalyst 10. Therefore, the user of the catalyst cleaning device 100 can remove the ash adhering to the catalyst 10.

[0097] (5) The program is a program that causes the control device of the support device 40 that moves the catalyst 10 in the vertical direction while supporting the catalyst 10 having a honeycomb structure to execute the step of lowering the catalyst 10 downward and immersing it in the cleaning liquids 31 and 32. In the immersion step, the time from when the catalyst 10 touches the cleaning liquids 31 and 32 until the entire catalyst 10 is immersed in the cleaning liquids 31 and 32 is 5 minutes or more.

[0098] As a result, since the catalyst 10 is slowly lowered into the cleaning liquids 31 and 32, the cleaning liquids 31 and 32 gradually penetrate from the lower opening surface of the catalyst 10 without blocking the upper opening surface of the catalyst 10. Thereby, the air trapped in the ash inside the catalyst 10 escapes from the upper opening surface of the catalyst 10. Therefore, the user who executes the program can remove the ash adhering to the catalyst 10.

[0099] (6) The catalyst cleaning device 100 includes a support device 40 that moves the catalyst 10 in the vertical direction while supporting the catalyst 10 having a honeycomb structure, and a control device 50 that controls the support device 40. The control unit 110 controls to stop the catalyst 10 with a part of the catalyst 10 protruding from the cleaning liquids 31 and 32, and after stopping, immerse the entire catalyst 10 in the cleaning liquids 31 and 32.

[0100] As a result, a part of the catalyst 10 immersed in the cleaning liquids 31 and 32 allows the cleaning liquids 31 and 32 to gradually penetrate from the lower opening surface of the catalyst 10 without blocking the upper opening surface of the catalyst 10. Thereby, the air trapped in the ash of a part of the immersed catalyst 10 escapes from the upper opening surface of the catalyst 10. Therefore, clogging due to ash of a part of the immersed catalyst 10 is removed.

[0101] (7) The program is a program for controlling a support device 40 that moves the catalyst 10 in the vertical direction while supporting the honeycomb-structured catalyst 10, and causes the control device to execute a step of lowering the catalyst 10 downward and immersing it in the cleaning liquids 31 and 32, and includes a step of stationary with a part of the catalyst 10 protruding from the cleaning liquids 31 and 32, and after stationary, causing the whole of the catalyst 10 to be immersed in the cleaning liquids 31 and 32.

[0102] As a result, a part of the catalyst 10 immersed in the cleaning liquids 31 and 32 allows the cleaning liquids 31 and 32 to gradually penetrate from the lower opening surface of the catalyst 10 in a state where the upper opening surface of the catalyst 10 is not blocked. Thereby, the air trapped in the ash of a part of the immersed catalyst 10 escapes from the upper opening surface of the catalyst 10. Therefore, clogging due to the ash of a part of the immersed catalyst 10 is removed.

Example

[0103] 《Regarding the cleaning liquid》 As the first cleaning liquid 31, a chemical solution prepared by mixing ammonium hydrogen fluoride (NH4HF2) as a fluorine compound at a ratio of 1.75% by mass of hydrogen fluoride, water or sulfamic acid (H3NSO3) as an inorganic acid at 3.2% by mass, and a commercially available nonionic surfactant mainly composed of polyoxyethylene polyoxypropylene glycol at 0.05% by mass was used. As the second cleaning liquid 32, a cleaning liquid prepared to have a concentration of 1 mol / l of sulfamic acid was used.

[0104] 《Measurement of clogging rate》 A used denitration catalyst was taken out from the actual machine, and the clogging rate of the taken-out denitration catalyst was measured by counting the number of clogged gas vents (cells) visually. To calculate the clogging rate, the formula clogging rate (%) = number of clogged cells / total number of cells × 100 was used. The denitration catalyst used was a honeycomb-shaped denitration catalyst (honeycomb denitration catalyst) having gas vents (honeycomb holes) with a size of 5 mm square and a size of 150 mm × 150 mm × 670 mm.

[0105] As an example of the method of the second embodiment, steps S31 to S33 of immersing in the first cleaning liquid 31 for 5 minutes each at positions of 10%, 30%, 50%, 70%, 90% and 100% from the lower part of the catalyst with a length of 670 mm were carried out once, and then steps 34 to 36 of partially immersing the catalyst with the second cleaning liquid 32 were carried out once. The remaining rate of clogging of the denitration catalyst after the treatment was measured in the same manner as described above.

[0106] FIG. 8 is a diagram showing the results of the remaining rate of clogging. When the remaining rate of clogging before the treatment according to the above embodiment was set to 1, the remaining rate of clogging after the treatment according to the above embodiment was 0.57.

Explanation of Signs

[0107] 10 Catalyst 11 Cell 21 First cleaning tank 22 Second cleaning tank 31 First cleaning liquid 32 Second cleaning liquid 40 Support device 41 Rail 50 Control device 60 Drain table 70 Hot air blower 100 Catalyst cleaning device 110 Control unit 120 Input reception unit 130 Storage unit 1100 Computer 1110 Processor 1120 Main memory 1130 Storage 1140 Interface

Claims

1. Supporting, above the cleaning liquid stored in the cleaning tank, a catalyst having a honeycomb structure with a plurality of cells, such that the lower opening surface of the catalyst where the plurality of cells are open faces the liquid surface of the cleaning liquid; Lowering the catalyst downward so that the cleaning liquid penetrates into the cells from the lower opening surface of the catalyst and immersing the catalyst in the cleaning liquid; comprising: In the step of immersing, the time from when the catalyst touches the cleaning liquid until the entire catalyst is immersed in the cleaning liquid is 5 minutes or more and 2 hours or less, and in the step of immersing, the catalyst is continuously lowered from when the catalyst touches the cleaning liquid until the entire catalyst is immersed in the cleaning liquid. A catalyst cleaning method.

2. Supporting, above the cleaning liquid stored in the cleaning tank, a catalyst having a honeycomb structure with a plurality of cells, such that the lower opening surface of the catalyst where the plurality of cells are open faces the liquid surface of the cleaning liquid; Lowering the catalyst downward so that the cleaning liquid penetrates into the cells from the lower opening surface of the catalyst and immersing the catalyst in the cleaning liquid; comprising: The step of immersing A first step of stationary the catalyst with a part of the catalyst immersed in the cleaning liquid; After the first step, a second step of lowering the catalyst downward by a predetermined distance; comprising: A catalyst cleaning method of repeating the first step and the second step to finally immerse the entire catalyst in the cleaning liquid.

3. A support device that is arranged above the cleaning liquid stored in the cleaning tank and supports a catalyst having a honeycomb structure with a plurality of cells while moving the catalyst in the vertical direction such that the lower opening surface of the catalyst where the plurality of cells are open faces the liquid surface of the cleaning liquid; A control device that controls the support device; comprising: The control device controls the support device such that the catalyst is continuously lowered from when the catalyst touches the cleaning liquid until the entire catalyst is immersed in the cleaning liquid, and the time until the entire catalyst is immersed in the cleaning liquid is 5 minutes or more and 2 hours or less. A catalyst cleaning device.

4. For a control device of a support device that moves a catalyst having a honeycomb structure with a plurality of cells in the vertical direction while supporting the catalyst Above the cleaning liquid stored in the cleaning tank, supporting the honeycomb-structured catalyst such that the opening surface at the lower part of the catalyst where the plurality of cells are open faces the liquid surface of the cleaning liquid; Lowering the catalyst downward so that the cleaning liquid enters the cells from the opening surface at the lower part of the catalyst and immersing the catalyst in the cleaning liquid, and a program for executing the steps; In the immersing step, from the time the catalyst touches the cleaning liquid until the entire catalyst is immersed in the cleaning liquid, the catalyst is continuously lowered, and the time until the entire catalyst is immersed in the cleaning liquid is 5 minutes or more and 2 hours or less.

5. A support device that supports a honeycomb-structured catalyst having a plurality of cells above the cleaning liquid stored in the cleaning tank and moves the catalyst in the vertical direction while supporting the catalyst such that the opening surface at the lower part of the catalyst where the plurality of cells are open faces the liquid surface of the cleaning liquid; A control device for controlling the support device; Comprising: The control device repeatedly performs a first step of stationary the catalyst with a part of the catalyst immersed in the cleaning liquid, and a second step of lowering the catalyst downward by a predetermined distance after the first step, and controls to immerse the entire catalyst in the cleaning liquid. A catalyst cleaning device.

6. In a control device of a support device that supports a honeycomb-structured catalyst having a plurality of cells and moves the catalyst in the vertical direction, Above the cleaning liquid stored in the cleaning tank, supporting the honeycomb-structured catalyst such that the opening surface at the lower part of the catalyst where the plurality of cells are open faces the liquid surface of the cleaning liquid; Lowering the catalyst downward so that the cleaning liquid enters the cells from the opening surface at the lower part of the catalyst and immersing the catalyst in the cleaning liquid, and a program for executing the steps; The immersing step is: A first step of stationary the catalyst with a part of the catalyst immersed in the cleaning liquid; A second step of lowering the catalyst downward by a predetermined distance after the first step; Having: A program that repeatedly performs the first step and the second step to finally immerse the entire catalyst in the cleaning liquid.

Images