Method for regenerating catalyst, device for regenerating catalyst, and program

Abstract

To solve a problem for example, in a technique for immersing a catalyst in a washing tank storing chemical liquid, for wetting a surface of the catalyst with the chemical liquid, for removing a deposit on the surface of the catalyst, however, if the catalyst is immersed in the chemical liquid which has been used repeatedly, relative to immersing the catalyst in unused chemical liquid, an amount of the deposit capable of being removed, is small, therefore, the chemical liquid has to be replaced for use of several times, therefore a large amount of the chemical liquid has to be used for removal of the deposit.SOLUTION: A catalyst regeneration method comprises: washing a catalyst with water; wetting the washed catalyst in first chemical liquid which has been used repeatedly; wetting the catalyst wet with the first chemical liquid with second chemical liquid; and washing the catalyst with finishing washing liquid being water or sulphamic acid-containing water, the first chemical liquid and second chemical liquid including at least, an inorganic acid and a fluorine compound, the inorganic acid including a hydrochloric acid, a hydrochloric acid and a boric acid, or a sulphamic acid.SELECTED DRAWING: Figure 2

Description

Technical Field

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

Background Art

[0002] Patent Document 1 discloses a technique in which a washed denitration catalyst is immersed in a chemical solution containing an inorganic acid and a fluorine compound, and water or a water containing sulfamic acid is used as a finishing cleaning solution to efficiently remove deposits attached to the surface of the denitration catalyst and to highly recover the catalyst performance.

[0003] Patent Document 2 discloses a technique for improving the catalyst activity by preliminarily washing a denitration catalyst whose activity has been reduced by a silica-alumina-calcium sulfate-based poison substance and then washing and removing the poison substance using a mixed solution of an organic acid and a fluoride.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] There is known a technique of immersing a catalyst in a cleaning tank containing a chemical solution to wet the surface of the catalyst with the chemical solution and removing deposits on the surface of the catalyst. However, when the catalyst is immersed in the repeatedly used chemical solution, the amount of deposits that can be removed is less than when the catalyst is immersed in the unused chemical solution. Therefore, it is necessary to replace the chemical solution every few uses, and a large amount of chemical solution is used for removing deposits. An object of the present disclosure is to provide a method for regenerating a catalyst, a catalyst regeneration apparatus, and a program that solve the above-described problems.

Means for Solving the Problem

[0006] The method for regenerating a catalyst according to the present disclosure includes washing the catalyst with water, wetting the washed catalyst with a first chemical solution that has been repeatedly used, wetting the catalyst wetted with the first chemical solution with a second chemical solution, and washing the catalyst with a finishing cleaning solution that is water or water containing sulfamic acid. The first chemical solution and the second chemical solution contain at least an inorganic acid and a fluorine compound, and the inorganic acid contains hydrochloric acid, hydrochloric acid and boric acid, or sulfamic acid.

[0007] The catalyst regeneration device according to the present disclosure includes a support device that moves the catalyst in the vertical, horizontal, and lateral directions while supporting the catalyst, and a control device that controls the support device. The control device controls to lower the catalyst downward and immerse it in a first chemical solution that has been repeatedly used, controls to lower the catalyst downward and immerse it in a second chemical solution, and controls to lower the catalyst downward and immerse it in a finishing cleaning solution. The first chemical solution and the second chemical solution contain at least an inorganic acid and a fluorine compound, the inorganic acid contains hydrochloric acid, hydrochloric acid and boric acid, or sulfamic acid, and the finishing cleaning solution is water or water containing sulfamic acid.

[0008] The program according to the present disclosure is a program that causes a control device of a support device that moves the catalyst in the vertical, horizontal, and lateral directions while supporting the catalyst to lower the catalyst downward and immerse it in a first chemical solution that has been repeatedly used, lower the catalyst downward and immerse it in a second chemical solution, and lower the catalyst downward and immerse it in a finishing cleaning solution. The first chemical solution and the second chemical solution contain at least an inorganic acid and a fluorine compound, the inorganic acid contains hydrochloric acid, hydrochloric acid and boric acid, or sulfamic acid, and the finishing cleaning solution is water or water containing sulfamic acid.

Advantages of the Invention

[0009] According to at least one of the above aspects, compared with the case of removing deposits by wetting the catalyst with a predetermined chemical solution once, the chemical solution can be used while replacing it less frequently, and deposits can be removed using a smaller amount of the chemical solution.

Brief Description of the Drawings

[0010]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Modes for Carrying Out the Invention

[0011] 〈First Embodiment〉 《Configuration of Catalyst Regeneration Apparatus》 Hereinafter, the catalyst regeneration apparatus 100 according to the embodiment will be described in detail with reference to the drawings. In order to remove nitrogen oxides (NO X ) from the exhaust gas generated during the combustion of power generation fuel, the catalyst 10 is used. However, when the catalyst 10 is used, deposits such as ash adhere to it from the exhaust gas, and the activity of removing nitrogen oxides decreases. The catalyst regeneration apparatus 100 removes the deposits on the surface of the catalyst 10 to prevent a significant decrease in the activity of the catalyst 10.

[0012] FIG. 1 is a diagram showing an example of the catalyst 10 according to the first embodiment. The catalyst 10 is a denitration catalyst that removes 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.

[0013] The catalyst 10 has a honeycomb structure in which a plurality of cells 11 formed in a hollow polygonal column fill the space. The catalyst 10 may be plate-shaped. 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. Although the cross-section of the cell 11 shown in FIG. 1 is square, the cross-section of the cell 11 may have different shapes such as triangular, pentagonal, rectangular, and hexagonal.

[0014] FIG. 2 is a schematic diagram showing an example of the configuration of a catalyst regeneration apparatus 100 according to the first embodiment. The catalyst regeneration apparatus 100 includes a first washing tank 21, a second washing tank 22, a third washing tank 23, a fourth washing tank 24, a support device 40, a control device 50, a draining stand 60, and a hot air blower 70.

[0015] The first washing tank 21 stores a first chemical solution 31 for removing ash adhering to the cells 11 of the catalyst 10. Examples of the first washing tank 21 include containers made of acrylic, SUS (Steel special Use Stainless), etc., and those with a lining treatment are also included. The first chemical solution 31 is a fluorine-based cleaning agent containing at least an inorganic acid and a fluorine compound. Examples of the inorganic acid include hydrochloric acid, hydrochloric acid and boric acid, or sulfamic acid. A surfactant may be included herein. The surfactant is more preferably a nonionic surfactant or an anionic surfactant. With this surfactant, calcium dissolved in the cleaning liquid and calcium in the dust can be highly dispersed, and there is an effect of suppressing reattachment to the catalyst. Approximately three times the volume of the catalyst 10 of the first chemical solution 31 is stored in the first washing tank 21. The first washing tank 21 is set directly below the rail 41 on which the support device 40 travels. The first chemical solution 31 is a repeatedly used chemical solution. That is, the first chemical solution 31 is a chemical solution in which the catalyst 10 has been immersed. For example, the first chemical solution 31 is a chemical solution in which the catalyst 10 has been immersed three times.

[0016] The second cleaning tank 22 stores a second chemical solution 32 for removing ash adhering to the cells 11 of the catalyst 10. Examples of the second cleaning tank 22 include containers made of acrylic, SUS, etc., and those with a lining treatment are also included. The second chemical solution 32 is a fluorine-based cleaning agent containing an inorganic acid and a fluorine compound. Examples of the inorganic acid include hydrochloric acid, hydrochloric acid and boric acid, or sulfamic acid. A surfactant may be included herein. The surfactant is more preferably a nonionic surfactant or an anionic surfactant. With this surfactant, calcium dissolved in the cleaning liquid and calcium in the dust can be highly dispersed, and there is an effect of suppressing reattachment to the catalyst. Approximately three times the volume of the catalyst 10 of the second chemical solution 32 is stored in the second cleaning tank 22. The second cleaning tank 22 is set directly below the rail 41 on which the support device 40 travels. The number of times the second chemical solution 32 is repeatedly used is less than the number of times the first chemical solution 31 is repeatedly used. For example, the second chemical solution 32 is a unused chemical solution.

[0017] The third cleaning tank 23 stores a first finishing cleaning liquid 33. Examples of the third cleaning tank 23 include containers made of acrylic, SUS, etc., and those with a lining treatment are also included. The first finishing cleaning liquid 33 is water or water containing sulfamic acid. Approximately three times the volume of the catalyst 10 of the first finishing cleaning liquid 33 is stored in the third cleaning tank 23. The third cleaning tank 23 is set directly below the rail 41 on which the support device 40 travels. The first finishing cleaning liquid 33 is a repeatedly used finishing cleaning liquid. That is, the first finishing cleaning liquid 33 is a chemical solution in which the catalyst 10 has been immersed. For example, the first finishing cleaning liquid 33 is a chemical solution in which the catalyst 10 has been immersed three times.

[0018] The fourth cleaning tank 24 stores a second finishing cleaning liquid 34. Examples of the fourth cleaning tank 24 include containers made of acrylic, SUS, etc., and those with a lining treatment are also included. The second finishing cleaning liquid 34 is water or water containing sulfamic acid. Approximately three times the volume of the catalyst 10 of the second finishing cleaning liquid 34 is stored in the fourth cleaning tank 24. The fourth washing tank 24 is set directly below the rail 41 on which the support device 40 travels. The number of times the second finishing cleaning liquid 34 is repeatedly used is less than the number of times the first finishing cleaning liquid 33 is repeatedly used. For example, the second finishing cleaning liquid 34 is a chemical solution that has not been used.

[0019] 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 surface of the first chemical solution 31, and supports the catalyst 10 so that the opening surface of the catalyst 10 faces the liquid surface of the second chemical solution 32. Further, the support device 40 supports the catalyst 10 so that the opening surface of the catalyst 10 faces the liquid surface of the first finishing cleaning liquid 33, and supports the catalyst 10 so that the opening surface of the catalyst 10 faces the liquid surface of the second finishing cleaning liquid 34.

[0020] The draining table 60 is a table on which the catalyst 10 is placed to remove the second finishing cleaning liquid 34 adhering to the catalyst 10. In addition to the above, the draining table 60 may be for removing water, the first chemical solution 31, the second chemical solution 32, and the first finishing cleaning liquid 33 adhering to the catalyst 10. The draining table 60 is set, for example, directly below the rail 41 on which the support device 40 travels.

[0021] 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 draining table 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.

[0022] The control device 50 is a device that receives an input from a user of the catalyst regeneration device 100 and controls the catalyst regeneration device 100 to immerse the catalyst 10 in the first chemical solution 31, the second chemical solution 32, the first finishing cleaning liquid 33, and the second finishing cleaning liquid 34 to clean the catalyst 10.

[0023] 《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.

[0024] 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 chemical solution 31. Further, 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 second chemical solution 32. Further, 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 finishing cleaning solution 33. Further, 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 second finishing cleaning solution 34. Further, the control unit 110 controls to move the catalyst 10 to the liquid draining table 60 and the hot air blower 70.

[0025] The input reception unit 120 receives an input from the user of the catalyst regeneration 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.

[0026] For example, when the input reception unit 120 is a touch panel, the input reception unit 120 receives inputs such as the position of the hoist on the rail 41 and the winding up and down of the wire rope on the display device. 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 the winding up and down of the wire rope.

[0027] 《An Example of the Usage Mode of the Catalyst Regeneration Device》 FIG. 4 is a flowchart showing an example of the usage mode of the catalyst regeneration device 100.

[0028] The user of the catalyst regeneration device 100 washes the catalyst 10 with water (step S1). For example, the user washes the catalyst 10 by performing rough water washing, vacuum water washing, and jet water washing on the catalyst 10.

[0029] The user of the catalyst regeneration 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 regeneration 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 chemical solution 31 and the opening surface of the catalyst 10 face each other when the first chemical solution 31 is injected into the first washing tank 21.

[0030] The user of the catalyst regeneration device 100 injects the first chemical solution 31 into the first washing tank 21 and injects the second chemical solution 32 into the second washing tank 22. Further, the user of the catalyst regeneration device 100 injects the first finishing washing liquid 33 into the third washing tank 23 and injects the second finishing washing liquid 34 into the fourth washing tank 24. (Step S3). The user of the catalyst regeneration device 100 may perform the operation of step S3 in advance before step S1.

[0031] Here, the number of times the catalyst 10 has been immersed in the first chemical solution 31 and the second chemical solution 32 is, for example, the number of times such that the removal rate of the deposits (such as ash) on the surface of the catalyst 10 becomes 95% or more after the catalyst 10 is immersed in the first chemical solution 31 and the second chemical solution 32. Each time the catalyst 10 is immersed in the first chemical solution 31 and the second chemical solution 32, the removal rate of the deposits on the surface of the catalyst 10 decreases. The user of the catalyst regeneration device 100 checks in advance the removal rate of the deposits on the surface of the catalyst 10 when the catalyst 10 is immersed in the first chemical solution 31 and the second chemical solution 32 for each number of times the catalyst 10 has been immersed in the first chemical solution 31 and the second chemical solution 32.

[0032] For example, when the number of times the catalyst 10 has been immersed in the first chemical solution 31 is any one of 1, 2, or 3 times, the removal rate of the deposits on the surface of the catalyst 10 by the first chemical solution 31 is 95% or more. That is, when the number of times the catalyst 10 has been immersed in the first chemical solution 31 is any one of 1, 2, or 3 times, the user does not inject the second chemical solution 32 into the second cleaning tank 22. On the other hand, when the number of times the catalyst 10 has been immersed in the first chemical solution 31 is 4 or 5 times, the removal rate of the deposits on the surface of the catalyst 10 by the first chemical solution 31 is not 95% or more. That is, when the number of times the catalyst 10 has been immersed in the first chemical solution 31 is 4 times or more, the user injects the second chemical solution 32 into the second cleaning tank 22. The second chemical solution 32 to be injected here is a chemical solution such that after the catalyst 10 is immersed in the first chemical solution 31 and the second chemical solution 32, the removal rate of the deposits on the surface of the catalyst 10 becomes 95% or more. For example, the second chemical solution 32 is a chemical solution in which the catalyst 10 has been immersed once. Also, for the first chemical solution 31 or the second chemical solution 32 in which the number of times the catalyst 10 has been immersed is 6 times or more, after the catalyst 10 is immersed in the first chemical solution 31 and the second chemical solution 32, the removal rate of the deposits on the surface of the catalyst 10 does not become 95% or more. Therefore, the first chemical solution 31 or the second chemical solution 32 in which the number of times the catalyst 10 has been immersed is 6 times or more is not used. In the above description, the number of times the catalyst 10 has been immersed in the first chemical solution 31 and the second chemical solution 32 is an example. The above number of times may vary depending on the degree of clogging of the opening surface of the catalyst 10 by ash, the concentration and components of the first chemical solution 31 and the second chemical solution 32, and the like.

[0033] Also, the number of times the catalyst 10 has been immersed in the first finishing cleaning solution 33 and the second finishing cleaning solution 34 is the number of times such that after the catalyst 10 is immersed in the first finishing cleaning solution 33 and the second finishing cleaning solution 34, the removal rate of the first chemical solution 31 or the second chemical solution 32 attached to the catalyst 10 becomes 95% or more. Each time the catalyst 10 is immersed in the first finishing cleaning liquid 33 and the second finishing cleaning liquid 34, the removal rate of the first chemical solution 31 or the second chemical solution 32 attached to the catalyst 10 decreases. The user of the catalyst regeneration device 100 checks in advance the removal rate of the first chemical solution 31 or the second chemical solution 32 attached to the catalyst 10 when the catalyst 10 is immersed in the first finishing cleaning liquid 33 and the second finishing cleaning liquid 34 for each number of times the catalyst 10 has been immersed in them.

[0034] For example, when the number of times the catalyst 10 has been immersed in the first finishing cleaning liquid 33 is any one of 1, 2, and 3 times, the removal rate of the first chemical solution 31 or the second chemical solution 32 with respect to the catalyst 10 in the first finishing cleaning liquid 33 is 95% or more. That is, when the number of times the catalyst 10 has been immersed in the first finishing cleaning liquid 33 is any one of 1, 2, and 3 times, the user does not inject the second finishing cleaning liquid 34 into the fourth cleaning tank 24. On the other hand, when the number of times the catalyst 10 has been immersed in the first finishing cleaning liquid 33 is 4 or 5 times, the removal rate of the first chemical solution 31 or the second chemical solution 32 attached to the catalyst 10 in the first finishing cleaning liquid 33 is not 95% or more. That is, when the number of times the catalyst 10 has been immersed in the first finishing cleaning liquid 33 is 4 or more times, the user injects the second finishing cleaning liquid 34 into the fourth cleaning tank 24. The second finishing cleaning liquid 34 to be injected here is a finishing cleaning liquid such that after the catalyst 10 is immersed in the first finishing cleaning liquid 33 and the second finishing cleaning liquid 34, the removal rate of the first chemical solution 31 or the second chemical solution 32 attached to the catalyst 10 becomes 95% or more. For example, the second finishing cleaning liquid 34 is a finishing cleaning liquid in which the catalyst 10 has been immersed once. Also, for the first finishing cleaning liquid 33 or the second finishing cleaning liquid 34 in which the number of times the catalyst 10 has been immersed is 6 or more times, after the catalyst 10 is immersed in the first finishing cleaning liquid 33 and the second finishing cleaning liquid 34, the removal rate of the first chemical solution 31 or the second chemical solution 32 attached to the catalyst 10 does not become 95% or more. Therefore, the first finishing cleaning liquid 33 or the second finishing cleaning liquid 34 in which the number of times the catalyst 10 has been immersed is 6 or more times is not used. The number of times the catalyst 10 has been immersed in the first finishing cleaning liquid 33 and the second finishing cleaning liquid 34 in the above description is an example. The above number can vary depending on the degree of clogging of the opening surface of the catalyst 10 by ash, the concentration and components of the first finishing cleaning liquid 33 and the second finishing cleaning liquid 34, etc.

[0035] The user of the catalyst regeneration device 100 uses the control device 50 to immerse the catalyst 10 in the first chemical solution 31 (step S4). For example, the user of the catalyst regeneration device 100 immerses the catalyst 10 in the first chemical solution 31 by performing the following operations.

[0036] The user of the catalyst regeneration device 100 inputs to the input reception unit 120 that after the support device 40 winds up the wire rope, the hoist of the support device 40 is to be moved above the first cleaning tank 21. That is, the input reception unit 120 receives an input from the user of the catalyst regeneration device 100 that the catalyst regeneration device 100 is to lift the catalyst 10 and move it above the first cleaning tank 21. Also, the user of the catalyst regeneration device 100 uses the operation lever, which is the input reception unit 120, to input to wind up the wire rope and to move the hoist above the first cleaning tank 21. The control unit 110 of the control device 50 receives the signal output by the input reception unit 120 and controls the support device 40 to lift the catalyst 10 and move it above the first cleaning tank 21. The control unit 110 receives the signal output by the input reception unit 120 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 that the control device 50 stores. The user of the catalyst regeneration device 100 inputs to the input receiving unit 120 an instruction to unwind the wire rope toward the first cleaning tank 21. That is, the input receiving unit 120 receives from the user of the catalyst regeneration device 100 an input instruction to lower the catalyst 10 into the first cleaning tank 21. The control unit 110 receives the signal output from the input receiving unit 120 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 chemical solution 31 in the first cleaning tank 21.

[0037] The user of the catalyst regeneration device 100 uses the control device 50 to take out the catalyst 10 from the first chemical solution 31 and immerse it in the second chemical solution 32 (step S5). For example, the user of the catalyst regeneration device 100 takes out the catalyst 10 from the first chemical solution 31 and immerses it in the second chemical solution 32 by performing the following operations.

[0038] The user of the catalyst regeneration 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 from the user of the catalyst regeneration device 100 an input instructing the catalyst regeneration device 100 to lift the catalyst 10. The control unit 110 receives the signal output by the input receiving unit 120 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. The user of the catalyst regeneration 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 from the user of the catalyst regeneration device 100 an input instructing the support device 40 to move the catalyst 10 above the second cleaning tank 22. The control unit 110 receives the signal output by the input receiving 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. The user of the catalyst regeneration device 100 inputs to the input receiving unit 120 an instruction to wind down the wire rope toward the second cleaning tank 22. That is, the input receiving unit 120 receives from the user of the catalyst regeneration device 100 an input instructing the catalyst 10 to be lowered into the second cleaning tank 22. The control unit 110 receives the signal output by the input receiving unit 120 and controls the support device 40 to wind down the wire rope into the second cleaning tank 22 so that the catalyst 10 fixed to the wire rope is immersed in the second chemical solution 32 in the second cleaning tank 22.

[0039] The removal rate of the deposits on the surface of the catalyst 10 in the first chemical solution 31 in which the catalyst 10 has been immersed is lower than the removal rate of the deposits on the surface of the catalyst 10 in the first chemical solution 31 in which the catalyst 10 has not been immersed. However, even if the removal rate is low, the first chemical solution 31 in which the catalyst 10 has been immersed 5 times or less can remove a certain amount of deposits. After the catalyst 10 is immersed in the first chemical solution 31 in step S4, by immersing the catalyst 10 in the second chemical solution 32 in step S5, the second chemical solution 32 will remove fewer deposits compared to the case where the first chemical solution 31 is not used. That is, by using the first chemical solution 31, the number of times the second chemical solution 32 can be used will increase. Therefore, the user of the catalyst regeneration device 100 can use the second chemical solution 32 while replacing it fewer times compared to the case where the first chemical solution 31 is not used, and can remove the deposits on the surface of the catalyst 10 even when using less chemical solution.

[0040] The user of the catalyst regeneration device 100 uses the control device 50 to take out the catalyst 10 from the second chemical solution 32 and immerse it in the first finishing cleaning solution 33 (step S6). In this case, after the user takes out the catalyst 10 from the second chemical solution 32 and leaves it for a certain period of time, by immersing it in the first finishing cleaning solution 33, the first chemical solution 31 attached to the catalyst 10 and the liquid of the second chemical solution 32 can be cut off and then immersed in the first finishing cleaning solution 33. The specific operation of the user using the control device 50 to take out the catalyst 10 from the second chemical solution 32 and immerse it in the first finishing cleaning solution 33 is the same as in step S5.

[0041] The user of the catalyst regeneration device 100 uses the control device 50 to take out the catalyst 10 from the first finishing cleaning solution 33 and immerse it in the second finishing cleaning solution 34 (step S7). The specific operation of the user using the control device 50 to take out the catalyst 10 from the first finishing cleaning solution 33 and immerse it in the second finishing cleaning solution 34 is the same as in step S5.

[0042] The user of the catalyst regeneration device 100 uses the control device 50 to take out the catalyst 10 from the second finishing cleaning solution 34 and move it onto the draining table 60 (step S8). The specific operation of the user using the control device 50 to take out the catalyst 10 from the second finishing cleaning solution 34 and move it onto the draining table 60 is the same as in step S5.

[0043] The user of the catalyst regeneration device 100 leaves the catalyst 10 moved to the draining table 60 to stand (step S9). Thereby, the liquids of the first chemical solution 31, the second chemical solution 32, the first finishing cleaning solution 33, and the second finishing cleaning solution 34 attached to the catalyst 10 are drained.

[0044] The user of the catalyst regeneration device 100 blows hot air onto the catalyst 10 using the hot air blower 70 to dry the catalyst 10 (step S10). Thereby, the liquids of the first chemical solution 31, the second chemical solution 32, the first finishing cleaning solution 33, and the second finishing cleaning solution 34 attached to the catalyst 10 are drained.

[0045] <<Function and Effect>> The catalyst regeneration method according to the present disclosure includes washing the catalyst 10 with water, wetting the washed catalyst 10 with the repeatedly used first chemical solution 31, wetting the catalyst 10 wetted with the first chemical solution 31 with the second chemical solution 32, and washing the catalyst 10 with a finishing cleaning solution that is water or water containing sulfamic acid. The first chemical solution 31 and the second chemical solution 32 contain at least an inorganic acid and a fluorine compound, and the inorganic acid contains hydrochloric acid, hydrochloric acid and boric acid, or sulfamic acid.

[0046] When the catalyst regeneration method is used, after removing the deposits adhering to the surface of the catalyst 10 using the repeatedly used first chemical solution 31, the catalyst 10 is wetted with the second chemical solution 32 to remove the deposits. As a result, the number of times the second chemical solution 32 can be used increases. Therefore, the user of the catalyst regeneration method can use and replace the chemical solution in fewer times compared to the case where the catalyst 10 is wetted once with a predetermined chemical solution, and can remove the deposits on the surface of the catalyst 10 using a smaller amount of the chemical solution.

[0047] Also, the catalyst 10 of the catalyst regeneration method is a denitration catalyst. Thereby, the user of the catalyst regeneration method can remove the deposits on the surface of the denitration catalyst using a smaller amount of the chemical solution compared to the case where the denitration catalyst is wetted once with a predetermined chemical solution.

[0048] In addition, the number of times the second chemical solution 32 of the catalyst regeneration method is repeatedly used is less than the number of times the first chemical solution 31 is repeatedly used.

[0049] When the catalyst regeneration method is used, after removing the deposits adhering to the surface of the catalyst 10 using the first chemical solution 31 with a large number of repeated uses, the catalyst 10 is wetted with the second chemical solution 32 with a small number of repeated uses to remove the deposits. As a result, the number of times the second chemical solution 32 can be used increases. Therefore, the user of the catalyst regeneration method can remove the deposits on the surface of the catalyst 10 using a smaller amount of chemical solution compared to the case where the catalyst 10 is wetted once with a predetermined chemical solution.

[0050] In addition, washing the catalyst 10 of the catalyst regeneration method with the finish washing solution includes washing the catalyst 10 with the first finish washing solution 33 which is a repeatedly used finish washing solution, and washing the catalyst 10 washed with the first finish washing solution 33 with the second finish washing solution 34 which is a finish washing solution.

[0051] When the catalyst regeneration method is used, after removing the deposits adhering to the catalyst 10 using the repeatedly used first finish washing solution 33, the catalyst 10 is wetted with the second finish washing solution 34 to remove the deposits adhering to the catalyst 10. As a result, the user of the catalyst regeneration method can increase the number of times the second finish washing solution 34 can be used. Therefore, the user of the catalyst regeneration method can remove the deposits adhering to the catalyst 10 using a smaller amount of finish washing solution compared to the case where the catalyst 10 is wetted once with a predetermined finish washing solution.

[0052] In addition, wetting the water-washed catalyst 10 of the catalyst regeneration method with the first chemical solution 31 means immersing the water-washed catalyst 10 in the first chemical solution 31, and wetting the catalyst 10 wetted with the first chemical solution 31 with the second chemical solution 32 means immersing the catalyst 10 immersed in the first chemical solution 31 in the second chemical solution 32.

[0053] When using the catalyst regeneration method, after removing the deposits adhering to the surface of the catalyst 10 using the repeatedly used first chemical solution 31, the catalyst 10 is immersed in the second chemical solution 32 to remove the deposits. As a result, the number of times the second chemical solution 32 can be used increases. Therefore, the user of the catalyst regeneration method can remove the deposits on the surface of the catalyst 10 using a smaller amount of the chemical solution compared to the case where the catalyst 10 is immersed in a predetermined chemical solution once.

[0054] Also, the first chemical solution 31 of the catalyst regeneration method is a chemical solution that has been repeatedly used one or more times. When using the catalyst regeneration method, after removing the deposits adhering to the surface of the catalyst 10 using the first chemical solution 31 that has been repeatedly used one or more times, the catalyst 10 is wetted with the second chemical solution 32 to remove the deposits. As a result, the number of times the second chemical solution 32 can be used increases. Therefore, the user of the catalyst regeneration method can remove the deposits on the surface of the catalyst 10 using a smaller amount of the chemical solution compared to the case where the catalyst 10 is wetted with a predetermined chemical solution once.

[0055] The catalyst regeneration device 100 according to the present disclosure includes a support device 40 that moves the catalyst 10 in the vertical, horizontal, and lateral directions while supporting the catalyst 10, and a control device 50 that controls the support device 40. The control device 50 controls to lower the catalyst 10 downward and immerse it in the repeatedly used first chemical solution 31, controls to lower the catalyst 10 downward and immerse it in the second chemical solution 32, controls to lower the catalyst 10 downward and immerse it in the finishing cleaning solution. The first chemical solution 31 and the second chemical solution 32 contain at least an inorganic acid and a fluorine compound. The inorganic acid contains hydrochloric acid, hydrochloric acid and boric acid, or sulfamic acid. The finishing cleaning solution is water or water containing sulfamic acid.

[0056] The catalyst regeneration device 100 removes deposits adhering to the surface of the catalyst 10 using the repeatedly used first chemical solution 31, and then immerses the catalyst 10 in the second chemical solution 32 to remove the deposits. As a result, the number of times the second chemical solution 32 can be used increases. Therefore, the catalyst regeneration device 100 can remove deposits on the surface of the catalyst 10 using a smaller amount of chemical solution compared to the case where the catalyst 10 is immersed in a predetermined chemical solution once.

[0057] The program according to the present disclosure causes the control device 50 of the support device 40 that moves the catalyst 10 in the vertical, horizontal, and lateral directions while supporting the catalyst 10 to lower the catalyst 10 downward and immerse it in the repeatedly used first chemical solution 31, lower the catalyst 10 downward and immerse it in the second chemical solution 32, and lower the catalyst 10 downward and immerse it in the finishing cleaning solution. The first chemical solution 31 and the second chemical solution 32 contain at least an inorganic acid and a fluorine compound. The inorganic acid contains hydrochloric acid, hydrochloric acid and boric acid, or sulfamic acid. The finishing cleaning solution is water or water containing sulfamic acid.

[0058] The user of the program removes deposits adhering to the surface of the catalyst 10 using the repeatedly used first chemical solution 31, and then immerses the catalyst 10 in the second chemical solution 32 to remove the deposits. As a result, the number of times the second chemical solution 32 can be used increases. Therefore, the user of the program can remove deposits on the surface of the catalyst 10 using a smaller amount of chemical solution compared to the case where the catalyst 10 is immersed in a predetermined chemical solution once.

[0059] <Second Embodiment> Hereinafter, the catalyst regeneration device 100 according to the second embodiment will be described.

[0060] 《Configuration of Catalyst Regeneration Device》 FIG. 5 is a diagram showing the configuration of the catalyst regeneration device 100 according to the second embodiment. The configuration of the catalyst regeneration device 100 according to the second embodiment is a configuration that does not include the second washing tank 22, the third washing tank 23, and the fourth washing tank 24 from the configuration of the catalyst regeneration device 100 according to the first embodiment. Further, the catalyst regeneration device 100 according to the second embodiment includes a nozzle 80, a first tank 90, a first pump 91, a second tank 93, and a second pump 94 in addition to the configuration of the catalyst regeneration device 100 according to the first embodiment.

[0061] Inside the first tank 90, four separated storage spaces are provided, and the first chemical solution 31, the second chemical solution 32, the first finishing cleaning solution 33, and the second finishing cleaning solution 34 are stored in the respective storage spaces.

[0062] The first pump 91 supplies the first chemical solution 31, the second chemical solution 32, the first finishing cleaning solution 33, and the second finishing cleaning solution 34 stored in the first tank 90 to the nozzle 80 using air pressure or the like.

[0063] The nozzle 80 injects the first chemical solution 31, the second chemical solution 32, the first finishing cleaning solution 33, and the second finishing cleaning solution 34 toward the opening surface of the catalyst 10 through a plurality of injection ports (not shown) provided on the side where the nozzle 80 faces the first washing tank 21 while moving in the A direction. The amount of each of the first chemical solution 31, the second chemical solution 32, the first finishing cleaning solution 33, and the second finishing cleaning solution 34 to be injected is approximately half of the volume of the catalyst 10. The catalyst regeneration device 100 may include a plurality of nozzles 80. In this case, after the catalyst 10 is lowered into the first washing tank 21, the catalyst regeneration device 100 moves the plurality of nozzles 80 above the catalyst 10 and injects them toward the opening surface of the catalyst 10 using the plurality of nozzles 80.

[0064] The second pump 94 moves the first chemical solution 31, the second chemical solution 32, the first finishing cleaning solution 33, and the second finishing cleaning solution 34 in the first washing tank 21 to the second tank 93 using air pressure or the like. The second tank 93 is provided with four separated storage spaces, and stores the first chemical solution 31 injected by the second pump 94, the second chemical solution 32, the first finishing cleaning solution 33, and the second finishing cleaning solution 34 in each storage space.

[0065] The control device 50 according to the second embodiment receives the input of the user of the catalyst regeneration device 100 and controls the first pump 91, the second pump 94, and the nozzle 80 to operate. Incidentally, the control device may be attached to each of the first pump 91, the second pump 94, and the nozzle 80.

[0066] <<An example of the usage mode of the catalyst regeneration device>> FIG. 6 is a flowchart showing an example of the usage mode of the catalyst regeneration device 100.

[0067] Perform the operations of steps S1 and S2 of the usage mode of the catalyst regeneration device 100 according to the first embodiment. The user of the catalyst regeneration device 100 injects the first chemical solution 31, the second chemical solution 32, the first finishing cleaning solution 33, and the second finishing cleaning solution 34 into the first tank 90 (step S13).

[0068] The user of the catalyst regeneration device 100 moves the catalyst 10 to the first cleaning tank 21 using the control device 50 (step S14). The specific operation of moving the catalyst 10 to the first cleaning tank 21 is the same as that of step S8 of the usage mode of the catalyst regeneration device 100 according to the first embodiment.

[0069] The user of the catalyst regeneration device 100 operates the first pump 91 using the control device 50 so that the first chemical solution 31 is supplied from the first tank 90 to the nozzle 80. While moving in the A direction, the nozzle 80 injects the first chemical solution 31 facing the opening surface of the catalyst 10 (step S15). After the operation of step S15, the nozzle 80 moves in the reverse direction of the A direction and returns to the position before step S15. Also, after the operation of step S15, the control device 50 operates the second pump 94 to move the first chemical solution 31 in the first cleaning tank 21 to the second tank 93.

[0070] By using the nozzle 80 to inject the first chemical solution 31 facing the opening surface of the catalyst 10, the opening surface of the catalyst 10 will be wetted by the first chemical solution 31. Therefore, compared with the case of immersing the catalyst 10 in the first chemical solution 31 like the catalyst regeneration device 100 according to the first embodiment, the catalyst regeneration device 100 can wet the catalyst 10 with a smaller amount of chemical solution.

[0071] The user of the catalyst regeneration device 100 operates the first pump 91 using the control device 50 so that the second chemical solution 32 is supplied from the first tank 90 to the nozzle 80. The nozzle 80 injects the second chemical solution 32 facing the opening surface of the catalyst 10 while moving in the A direction (step S16). After the operation of step S16, the nozzle 80 moves in the reverse direction of the A direction and returns to the position before step S16. Also, after the operation of step S16, the control device 50 operates the second pump 94 to move the second chemical solution 32 in the first cleaning tank 21 to the second tank 93.

[0072] The user of the catalyst regeneration device 100 operates the first pump 91 using the control device 50 so that the first finishing cleaning liquid 33 is supplied from the first tank 90 to the nozzle 80. The nozzle 80 injects the first finishing cleaning liquid 33 facing the opening surface of the catalyst 10 while moving in the A direction (step S17). After the operation of step S17, the nozzle 80 moves in the reverse direction of the A direction and returns to the position before step S17. Also, after the operation of step S17, the control device 50 operates the second pump 94 to move the first finishing cleaning liquid 33 in the first cleaning tank 21 to the second tank 93.

[0073] The user of the catalyst regeneration device 100 operates the first pump 91 using the control device 50 so that the second finishing cleaning liquid 34 is supplied from the first tank 90 to the nozzle 80. While moving in the A direction, the nozzle 80 injects the second finishing cleaning liquid 34 facing the opening surface of the catalyst 10 (step S18). After the operation of step S18, the nozzle 80 moves in the direction opposite to the A direction and returns to the position before step S18. Further, after the operation of step S18, the control device 50 operates the second pump 94 to move the second finishing cleaning liquid 34 in the first cleaning tank 21 to the second tank 93.

[0074] The user of the catalyst regeneration device 100 takes out the catalyst 10 from the first cleaning tank 21 and moves it to the draining table 60 using the control device 50 (step S19). The specific operation of taking out the catalyst 10 from the first cleaning tank 21 and moving it to the draining table 60 is the same as step S8 of the usage mode of the catalyst regeneration device 100 according to the first embodiment.

[0075] Perform the operations of step S9 and step S10 of the usage mode of the catalyst regeneration device 100 according to the first embodiment. Similar to the first embodiment, it is also possible to provide a cleaning tank for each cleaning liquid and spray the cleaning liquid on each cleaning tank. The first tank 90, the first pump 91, the nozzle 80, the second pump 94, and the second tank 93 may be provided for each cleaning liquid.

[0076] 《Function and Effect》 The catalyst 10 of the catalyst regeneration method according to the present disclosure is a honeycomb structure or a plate-shaped catalyst 10. Wetting the water-washed catalyst 10 with the first chemical solution 31 includes injecting the first chemical solution 31 from a position facing the opening surface of the honeycomb structure or the plate-shaped catalyst 10. Wetting the catalyst 10 wetted with the first chemical solution 31 with the second chemical solution 32 includes injecting the second chemical solution 32 from a position facing the opening surface of the honeycomb structure or the plate-shaped catalyst 10.

[0077] When using the catalyst regeneration method, the first chemical solution 31 and the second chemical solution 32 are sprayed from a position facing the opening surface of the honeycomb structure or plate-shaped catalyst to wet the catalyst 10. A user of the catalyst regeneration method can wet the catalyst 10 using a smaller amount of the first chemical solution 31 and the second chemical solution 32 compared to using other methods of wetting the catalyst 10. Thereby, the user of the catalyst regeneration method can remove the deposits on the surface of the catalyst 10.

[0078] 〈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 control device 50 is implemented in the computer 1100. The operations of the above-described respective processing units are stored in the storage 1130 in the form of a program. The processor 1110 reads the program from the storage 1130, expands it in the main memory 1120, and executes the above processing according to the program. Further, 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.

[0079] The program may be for realizing a part of the functions to be exerted on the computer 1100. For example, the program may exert functions in combination with other programs already stored in the storage 1130 or in 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.

[0080] 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 may be an external medium connected to the computer via the interface 1140 or a communication line. Also, when this program is distributed to the computer 1100 via a communication line, the computer 1100 that has received the distribution 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.

[0081] Also, the program may be for realizing a part of the functions described above. Furthermore, the program may be a so-called difference file (difference program) that realizes the functions described above in combination with other programs already stored in the storage 1130.

[0082] <Supplementary Note> The catalyst regeneration device 100 described in each embodiment is understood as follows, for example.

[0083] (1) The catalyst regeneration method according to the present disclosure includes washing the catalyst 10 with water, wetting the washed catalyst 10 with the repeatedly used first chemical solution 31, wetting the catalyst 10 wetted with the first chemical solution 31 with the second chemical solution 32, and washing the catalyst 10 with a finishing cleaning solution that is water or water containing sulfamic acid. The first chemical solution 31 and the second chemical solution 32 contain at least an inorganic acid and a fluorine compound, and the inorganic acid contains hydrochloric acid, hydrochloric acid and boric acid, or sulfamic acid.

[0084] When the catalyst regeneration method is used, after removing the deposits adhering to the surface of the catalyst 10 using the repeatedly used first chemical solution 31, the catalyst 10 is wetted with the second chemical solution 32 to remove the deposits. As a result, the number of times the second chemical solution 32 can be used increases. Therefore, the user of the catalyst regeneration method can use the chemical solution while replacing it fewer times compared to the case where the catalyst 10 is wetted once with a predetermined chemical solution, and can remove the deposits on the surface of the catalyst 10 using a smaller amount of the chemical solution.

[0085] (2) Further, the catalyst 10 in the catalyst regeneration method is a denitration catalyst. Thereby, the user of the catalyst regeneration method can remove the deposits on the surface of the denitration catalyst using a smaller amount of the chemical solution compared to the case where the denitration catalyst is wetted once with a predetermined chemical solution.

[0086] (3) Further, the number of times the second chemical solution 32 is repeatedly used is less than the number of times the first chemical solution 31 is repeatedly used.

[0087] When using the catalyst regeneration method, after removing the deposits adhering to the surface of the catalyst 10 using the first chemical solution 31 with a large number of repeated uses, the catalyst 10 is wetted with the second chemical solution 32 with a small number of repeated uses to remove the deposits. As a result, the number of times the second chemical solution 32 can be used will increase. Therefore, the user of the catalyst regeneration method can remove the deposits on the surface of the catalyst 10 using a smaller amount of chemical solution compared to the case of wetting the catalyst 10 once with a predetermined chemical solution.

[0088] (4) Also, washing the catalyst 10 of the catalyst regeneration method with the finish washing solution includes washing the catalyst 10 with the first finish washing solution 33 which is a repeatedly used finish washing solution, and washing the catalyst 10 washed with the first finish washing solution 33 with the second finish washing solution 34 which is a finish washing solution.

[0089] When using the catalyst regeneration method, after removing the deposits adhering to the catalyst 10 using the repeatedly used first finish washing solution 33, the catalyst 10 is wetted with the second finish washing solution 34 to remove the deposits adhering to the catalyst 10. As a result, the user of the catalyst regeneration method can increase the number of times the second finish washing solution 34 can be used. Therefore, the user of the catalyst regeneration method can remove the deposits adhering to the catalyst 10 using a smaller amount of finish washing solution compared to the case of wetting the catalyst 10 once with a predetermined finish washing solution.

[0090] (5) Also, wetting the water-washed catalyst 10 of the catalyst regeneration method with the first chemical solution 31 means immersing the water-washed catalyst 10 in the first chemical solution 31, and wetting the catalyst 10 wetted with the first chemical solution 31 with the second chemical solution 32 means immersing the catalyst 10 immersed in the first chemical solution 31 in the second chemical solution 32.

[0091] When using the catalyst regeneration method, after removing the deposits adhering to the surface of the catalyst 10 using the repeatedly used first chemical solution 31, the catalyst 10 is immersed in the second chemical solution 32 to remove the deposits. As a result, the number of times the second chemical solution 32 can be used increases. Therefore, the user of the catalyst regeneration method can remove the deposits on the surface of the catalyst 10 using a smaller amount of chemical solution compared to the case of immersing the catalyst 10 in a predetermined chemical solution once.

[0092] (6) Also, the first chemical solution 31 of the catalyst regeneration method is a chemical solution that has been repeatedly used one or more times. When using the catalyst regeneration method, after removing the deposits adhering to the surface of the catalyst 10 using the first chemical solution 31 that has been repeatedly used one or more times, the catalyst 10 is wetted with the second chemical solution 32 to remove the deposits. As a result, the number of times the second chemical solution 32 can be used increases. Therefore, the user of the catalyst regeneration method can remove the deposits on the surface of the catalyst 10 using a smaller amount of chemical solution compared to the case of wetting the catalyst 10 with a predetermined chemical solution once.

[0093] (7) The catalyst regeneration apparatus 100 according to the present disclosure includes a support device 40 that moves the catalyst 10 in the vertical direction while supporting the catalyst 10, and a control device 50 that controls the support device 40. The control device 50 controls to lower the catalyst 10 downward and immerse it in the repeatedly used first chemical solution 31, controls to lower the catalyst 10 downward and immerse it in the second chemical solution 32, controls to lower the catalyst 10 downward and immerse it in the finishing cleaning solution. The first chemical solution 31 and the second chemical solution 32 contain at least an inorganic acid and a fluorine compound. The inorganic acid contains hydrochloric acid, hydrochloric acid and boric acid, or sulfamic acid. The finishing cleaning solution is water or water containing sulfamic acid.

[0094] The catalyst regeneration device 100 removes deposits adhering to the surface of the catalyst 10 using the repeatedly used first chemical solution 31, and then immerses the catalyst 10 in the second chemical solution 32 to remove the deposits. As a result, the number of times the second chemical solution 32 can be used increases. Therefore, the catalyst regeneration device 100 can remove deposits on the surface of the catalyst 10 using a smaller amount of chemical solution compared to the case where the catalyst 10 is immersed in a predetermined chemical solution once.

[0095] (8) The program according to the present disclosure causes the control device 50 of the support device 40 that moves the catalyst 10 vertically while supporting the catalyst 10 to lower the catalyst 10 downward and immerse it in the repeatedly used first chemical solution 31, lower the catalyst 10 downward and immerse it in the second chemical solution 32, and lower the catalyst 10 downward and immerse it in the finishing cleaning solution. The first chemical solution 31 and the second chemical solution 32 contain at least an inorganic acid and a fluorine compound. The inorganic acid contains hydrochloric acid, hydrochloric acid and boric acid, or sulfamic acid. The finishing cleaning solution is water or water containing sulfamic acid.

[0096] The user of the program removes deposits adhering to the surface of the catalyst 10 using the repeatedly used first chemical solution 31, and then immerses the catalyst 10 in the second chemical solution 32 to remove the deposits. As a result, the number of times the second chemical solution 32 can be used increases. Therefore, the user of the program can remove deposits on the surface of the catalyst 10 using a smaller amount of chemical solution compared to the case where the catalyst 10 is immersed in a predetermined chemical solution once.

[0097] (9) The catalyst 10 in the catalyst regeneration method according to the present disclosure is a honeycomb structure or a plate-shaped catalyst 10. Wetting the washed catalyst 10 with the first chemical solution 31 includes spraying the first chemical solution 31 from a position facing the opening surface of the honeycomb structure or the plate-shaped catalyst 10. Wetting the catalyst 10 wetted with the first chemical solution 31 with the second chemical solution 32 includes spraying the second chemical solution 32 from a position facing the opening surface of the honeycomb structure or the plate-shaped catalyst 10.

[0098] When using the catalyst regeneration method, the first chemical solution 31 and the second chemical solution 32 are sprayed from a position facing the opening surface of the honeycomb structure or plate-shaped catalyst to wet the catalyst 10. The user of the catalyst regeneration method can wet the catalyst 10 using a smaller amount of the first chemical solution 31 and the second chemical solution 32 compared to using other methods of wetting the catalyst 10. Thereby, the user of the catalyst regeneration method can remove the deposits on the surface of the catalyst 10.

Explanation of Signs

[0099] 10 Catalyst 11 Cell 21 First cleaning tank 22 Second cleaning tank 23 Third cleaning tank 24 Fourth cleaning tank 31 First chemical solution 32 Second chemical solution 33 First finishing cleaning solution 34 Second finishing cleaning solution 40 Support device 41 Rail 50 Control device 60 Drain table 70 Hot air blower 80 Nozzle 90 First tank 91 First pump 93 Second tank 94 Second pump 100 Catalyst regeneration device 110 Control unit 120 Input reception unit 1100 Computer 1110 Processor 1120 Main memory 1130 Storage 1140 Interface

Claims

1. Washing the catalyst with water; spraying a first chemical solution that has been repeatedly used onto the catalyst that has been washed with water to wet the surface of the catalyst; Injecting a second chemical liquid onto the catalyst wetted with the first chemical liquid to wet the surface of the catalyst; washing the catalyst with a finish wash solution which is water or water containing sulfamic acid; Including, The first chemical solution and the second chemical solution contain at least an inorganic acid and a fluorine compound, The inorganic acid includes sulfamic acid; The catalyst is a denitration catalyst. Methods for regenerating catalysts.

2. Washing the catalyst with the finish wash solution comprises: washing the catalyst with a first finishing wash solution, which is a repeatedly used finishing wash solution; Washing the catalyst washed with the first finish washing solution with a second finish washing solution which is a finish washing solution; 2. The method of claim 1, comprising:

3. Wetting the catalyst that has been washed with water with the first chemical liquid means immersing the catalyst that has been washed with water in the first chemical liquid, Wetting the catalyst wetted with the first chemical liquid with the second chemical liquid means immersing the catalyst immersed in the first chemical liquid in the second chemical liquid. A method for regenerating the catalyst according to claim 1 or 2.

4. The catalyst is a honeycomb-structured or plate-shaped catalyst, Wetting the catalyst that has been washed with water with the first chemical liquid includes spraying the first chemical liquid from a position facing an opening surface of the honeycomb structure or plate-like catalyst, Wetting the catalyst wetted with the first chemical liquid with the second chemical liquid includes spraying the second chemical liquid from a position facing the honeycomb-structured catalyst or a plate-shaped opening surface. A method for regenerating the catalyst according to claim 1 or 2.

5. The first chemical solution is a chemical solution that has been repeatedly used one or more times. A method for regenerating a catalyst according to any one of claims 1 to 4.

6. A nozzle capable of spraying a chemical solution; A pump that supplies the chemical solution to the nozzle; A control device for controlling the pump; Equipped with The control device includes: Controlling the pump to operate the nozzle; The first chemical solution that has been repeatedly used is sprayed from the nozzle onto the catalyst that has been washed with water, A second chemical liquid is sprayed from the nozzle onto the catalyst wetted with the first chemical liquid, washing the catalyst with a finish wash solution which is water or water containing sulfamic acid; Including, The first chemical solution and the second chemical solution contain at least an inorganic acid and a fluorine compound, The inorganic acid includes sulfamic acid; The catalyst is a denitration catalyst. Catalyst regeneration device.

7. A nozzle capable of spraying a chemical solution including a first chemical solution, a second chemical solution, and a finishing cleaning solution; a tank for separately storing the first chemical liquid, the second chemical liquid, and the finish cleaning liquid; a first pump capable of supplying any one of the first chemical liquid, the second chemical liquid, and the finish cleaning liquid from the tank to the nozzle; A control device for controlling the first pump; A computer of a playback device comprising: controlling the first pump to operate the nozzle; The first chemical solution that has been repeatedly used is sprayed from the nozzle onto the catalyst that has been washed with water, The second chemical liquid is sprayed from the nozzle onto the catalyst wetted with the first chemical liquid, washing the catalyst with the finish wash solution, which is water or water containing sulfamic acid; A program for executing The first chemical solution and the second chemical solution contain at least an inorganic acid and a fluorine compound, The inorganic acid includes sulfamic acid; The catalyst is a denitration catalyst. program.

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