Cleaning device for denitration catalyst

Abstract

The utility model provides a cleaning device for a denitration catalyst, and relates to the technical field of denitration catalyst regeneration. The device comprises a cleaning liquid storage tank, a cleaning tank and at least one filter which are sequentially communicated, an outlet of the filter is connected back to the cleaning liquid storage tank, cleaning liquid is contained in the cleaning liquid storage tank, the denitration catalyst is placed in the cleaning tank, and the cleaning liquid can be introduced into the cleaning tank to clean the denitration catalyst, then is filtered by the filter and flows back to the cleaning liquid storage tank to be recycled. The device can be used for the cleaning and wet regeneration process of the denitration catalyst, is simple in design and simple and convenient to operate, and is suitable for cleaning various denitration catalysts.

Description

Technical Field

[0001] This utility model relates to the field of denitrification catalyst regeneration technology, and in particular to a cleaning device for denitrification catalysts. Background Technology

[0002] Denitrification catalysts are the core of SCR denitrification projects in coal-fired power plants. Common denitrification catalysts can be classified into three types according to their structure: honeycomb, flat plate, and corrugated plate. In practical engineering applications, due to the influence of fly ash in the flue gas, denitrification catalysts will gradually deactivate over time.

[0003] Deactivated denitration catalysts require regeneration, and the mainstream regeneration technology is currently wet regeneration. The implementation steps of this technology are as follows: First, the deactivated denitration catalyst is de-ashed to remove the accumulated ash from the surface and pores. Then, the de-ashed catalyst is placed in an acidic or alkaline cleaning solution to remove toxic elements such as K, Na, As, and P from the catalyst, thereby restoring the catalyst activity.

[0004] Currently, many patents on wet regeneration technology for denitrification catalysts have been disclosed in this field, such as Chinese invention patents CN106807401A and CN110124754A, but none of them involve related devices for cleaning denitrification catalysts.

[0005] In view of the above reasons, this utility model proposes a cleaning device for denitrification catalyst. Utility Model Content

[0006] The purpose of this invention is to provide a cleaning device for denitrification catalysts, which can be used for cleaning and wet regeneration processes of denitrification catalysts.

[0007] This utility model provides a cleaning device for a denitrification catalyst, comprising: a cleaning liquid storage tank, a cleaning tank, and at least one filter connected in sequence. The outlet of the filter is connected back to the cleaning liquid storage tank. The cleaning liquid storage tank contains cleaning liquid. The denitrification catalyst is placed in the cleaning tank. The cleaning liquid can be passed into the cleaning tank to clean the denitrification catalyst, and then filtered by the filter and flowed back to the cleaning liquid storage tank.

[0008] Preferably, a cleaning pump is connected between the outlet of the cleaning fluid storage tank and the inlet of the cleaning tank.

[0009] Preferably, the filter is a membrane tube filter.

[0010] Preferably, the membrane tube filters are in two sets, arranged in parallel between the cleaning tank and the cleaning solution storage tank.

[0011] Preferably, the cleaning tank is connected to the two sets of parallel membrane tube filters by a main control valve. The inlet and outlet of the two sets of membrane tube filters are respectively provided with an inlet valve and an outlet valve. The two sets of inlet valves are not opened or closed at the same time, and the two sets of outlet valves are not opened or closed at the same time.

[0012] Preferably, the bottom of the cleaning tank is connected to at least one air inlet pipe, and an air inlet valve is installed on the air inlet pipe.

[0013] Preferably, the membrane tube in the membrane tube filter is a ceramic membrane tube with a filtration accuracy of 0.1 to 5 μm.

[0014] Preferably, the cleaning solution in the cleaning solution storage tank is a 0.1-1 wt% H2SO4 solution or a 0.5-2 wt% NaOH solution.

[0015] Preferably, the cleaning tank is heated by an external heating jacket or a built-in electric heating tube.

[0016] Preferably, the heating operating temperature of the cleaning tank is 25–50°C.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The denitrification catalyst cleaning device of this utility model is simple in design and easy to operate, and is suitable for cleaning various types of denitrification catalysts;

[0019] 2. In this utility model of denitrification catalyst cleaning device, the cleaning liquid in the cleaning tank can be filtered through a filter to remove fly ash sediment and impurities, and then returned to the cleaning liquid storage tank, so that the cleaning liquid can be recycled, which can reduce resource waste. In addition, the cleaning liquid in the cleaning tank always maintains a stable concentration and solid content, which can maximize the cleaning effect. Attached Figure Description

[0020] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0021] Figure 1 This is a connection principle diagram of the cleaning device of this utility model;

[0022] Explanation of reference numerals in the attached figures:

[0023] 1: Cleaning fluid storage tank; 2: Cleaning pump; 3: Cleaning tank; 4: First membrane tube filter; 5: Second membrane tube filter; 6: Air inlet valve; 7: Main control valve; 8: First water inlet valve; 9: Second water inlet valve; 10: First water outlet valve; 11: Second water outlet valve. Detailed Implementation

[0024] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0025] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0026] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified. Furthermore, the terms "installed," "connected," and "linked" should be interpreted broadly; for example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0027] like Figure 1As shown, this utility model provides a cleaning device for a denitrification catalyst, comprising: a cleaning liquid storage tank 1, a cleaning tank 3, and at least one filter connected in sequence. The outlet of the filter is connected back to the cleaning liquid storage tank 1. The cleaning liquid storage tank 1 contains cleaning liquid for cleaning the deactivated denitrification catalyst. The deactivated denitrification catalyst is placed in the cleaning tank 3. The cleaning liquid can flow into the cleaning tank 3. After cleaning the denitrification catalyst, the cleaning liquid is filtered by the filter to remove fly ash precipitate and impurities, and then flows back to the cleaning liquid storage tank 1 for recycling.

[0028] In this embodiment, a cleaning pump 2 is connected between the outlet of the cleaning fluid storage tank 1 and the inlet of the cleaning tank 3. The cleaning pump 2 can provide power for the flow of cleaning fluid and can be used in scenarios where the distance between the cleaning fluid storage tank 1 and the cleaning tank 3 is far or the position is lower than that of the tank 3.

[0029] Specifically, the aforementioned filters are membrane tube filters, and there are two sets: a first membrane tube filter 4 and a second membrane tube filter 5 arranged in parallel between the cleaning tank 3 and the cleaning fluid storage tank 1. A main control valve 7 connects the main pipeline between the cleaning tank 3 and the parallel first membrane tube filter 4 and the second membrane tube filter 5. A first inlet valve 8 and a first outlet valve 10 are respectively installed at the inlet and outlet of the branch where the first membrane tube filter 4 is located. A second inlet valve 9 and a second outlet valve 11 are respectively installed at the inlet and outlet of the branch where the second membrane tube filter 5 is located. The first inlet valve 8 and the second inlet valve 9 are not opened or closed simultaneously, and the first outlet valve 10 and the second outlet valve 11 are not opened or closed simultaneously. This allows the first membrane tube filter 4 and the second membrane tube filter 5 to be used alternately, facilitating cleaning or replacement of the filter media when they become clogged or the pressure drop rises to the operating threshold.

[0030] Specifically, the membrane tubes in the first membrane tube filter 4 and the second membrane tube filter 5 are ceramic membrane tubes with a filtration accuracy of 0.1–5 μm. In this embodiment, a ceramic membrane tube with a filtration accuracy of 1 μm is selected.

[0031] The cleaning solution used in the cleaning solution storage tank 1 is a 0.1-1 wt% H2SO4 solution or a 0.5-2 wt% NaOH solution. In this embodiment, a 0.5 wt% H2SO4 solution is selected.

[0032] Specifically, the bottom of the cleaning tank 3 is connected to at least one air inlet pipe, and an air inlet valve 6 is installed on the air inlet pipe, through which air can be blown into the cleaning tank 3. In order to improve the bubbling cleaning effect, multiple sets of air inlet pipes and air inlet valves 6 can be set.

[0033] Specifically, the cleaning tank 3 has a heating function, which can be achieved through an external heating jacket or a built-in electric heating tube. The heating operating temperature of the cleaning tank 3 is 25-50°C. In this embodiment, the built-in electric heating tube is used to maintain the temperature of the cleaning fluid in the cleaning tank 3 at 40°C.

[0034] When this invention is used for activity testing of denitrification catalysts, it includes the following steps:

[0035] S1: Add the deactivated denitrification catalyst to the cleaning tank 3;

[0036] S2: Turn on cleaning pump 2 and inject a certain amount of 0.5wt% H2SO4 solution into cleaning tank 3, then turn off cleaning pump 2;

[0037] S3: Open the air intake valve 6 to blow air into the cleaning tank 3;

[0038] S4: Turn on the electric heating tube in the cleaning tank 3 to heat the cleaning solution in the tank to 40℃;

[0039] S5: After 30 minutes of bubbling cleaning, close the air inlet valve 6, open the main control valve 7, the first water inlet valve 8 and the first water outlet valve 10. The cleaning solution is filtered by the first membrane tube filter 4 and then returned to the cleaning solution storage tank 1 for recycling.

[0040] S6: When the pressure drop of the first membrane tube filter 4 rises to the operating threshold after a certain period of use, close the first inlet valve 8 and the first outlet valve 10, and at the same time open the second inlet valve 9 and the second outlet valve 11 to introduce the cleaning solution into the second membrane tube filter 5 for filtration.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A cleaning device for a denitrification catalyst, characterized in that, The application relates to a device for cleaning a denitration catalyst, which comprises a cleaning liquid storage tank, a cleaning tank and at least one filter connected in sequence, the outlet of the filter is connected to the cleaning liquid storage tank, the cleaning liquid storage tank contains cleaning liquid, the denitration catalyst is arranged in the cleaning tank, the cleaning liquid can be introduced into the cleaning tank to clean the denitration catalyst, and the cleaning liquid is filtered by the filter and then flows back to the cleaning liquid storage tank. The outlet of the cleaning liquid storage tank and the inlet of the cleaning tank are connected by a cleaning pump.

2. The device for cleaning the denitration catalyst according to claim 1, wherein The filter is a membrane tube filter.

3. The device for cleaning the NOx removal catalyst according to claim 1, wherein The number of the membrane tube filters is two, and the two filters are arranged in parallel between the cleaning tank and the cleaning liquid storage tank.

4. The device for cleaning the NOx removal catalyst according to claim 3, wherein The cleaning tank is connected to the two parallel membrane tube filters by a main control valve, and the inlets and outlets of the two membrane tube filters are respectively provided with water inlet valves and water outlet valves, wherein the two water inlet valves are not opened or closed at the same time, and the two water outlet valves are not opened or closed at the same time.

5. The device for cleaning the NOx removal catalyst according to claim 4, wherein The bottom of the cleaning tank is connected to at least one air inlet pipe, and the air inlet pipe is provided with an air inlet valve.

6. The device for cleaning a denitration catalyst according to claim 1, wherein The membrane tube in the membrane tube filter is a ceramic membrane tube, and the filtering precision is 0.1-5 mu m.

7. The device for cleaning the NOx removal catalyst according to claim 3, wherein The cleaning liquid in the cleaning liquid storage tank is a 0.1-1 wt% H2SO4 solution or a 0.5-2 wt% NaOH solution.

8. The device for cleaning a denitration catalyst according to claim 1, wherein The cleaning tank is heated by an external heating jacket or an internal electric heating pipe.

9. The device for cleaning the NOx removal catalyst according to Claim 1, wherein The heating operation temperature of the cleaning tank is 25-50 DEG C.

10. The device for cleaning a denitration catalyst according to claim 9, wherein ​

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