Preparation system of CuMn denitration catalyst

Abstract

The utility model provides a preparation system of a CuMn denitration catalyst, and aims to solve the problems of non-uniform materials and back-mixing when a traditional intermittent kettle is used for preparing the CuMn denitration catalyst, the preparation system is provided with at least two aging kettles which are connected in parallel and are matched with a reaction kettle to work, so that the materials are uniformly mixed; the reaction kettle is provided with the overflow port, so that reacted materials in the reaction kettle can flow into different aging kettles through the overflow port for subsequent treatment, the problem of material difference caused by non-continuous solution extraction in the feeding process of a traditional intermittent kettle is avoided, the uniformity of the materials is improved, and meanwhile, stirrers are mounted in the reaction kettle and the aging kettles, so that uniform mixing of the materials is further promoted. In addition, the aging kettles are communicated with a flushing device, and valves are arranged on communicating pipelines, so that the aging kettles for discharging materials are conveniently flushed in time in the preparation process, the influence of material residues on subsequent preparation is prevented, the materials can be injected into the aging kettles again after cleaning, continuous pumping of mixed solution materials is achieved through the arrangement of the multiple aging kettles, and the production efficiency is improved. And the preparation uniformity of the catalyst can be improved.

Description

Technical Field

[0001] This invention relates to the field of preparation technology of denitrification catalysts, and in particular to a preparation system for a CuMn denitrification catalyst. Background Technology

[0002] Vanadium-titanium-based denitrification catalysts have an activity temperature window of 320–420℃ and a design life of approximately 24,000 hours, and have been widely used in denitrification projects in coal-fired power plants. In recent years, with the basic completion of ultra-low emission retrofits for coal-fired power plants, denitrification projects in non-power sectors such as steel, cement, and coking have gradually gained attention. The flue gas temperature in non-power industries is typically low (<300℃), making vanadium-titanium-based catalysts unsuitable; low-temperature denitrification catalysts are required.

[0003] CuMn denitrification catalysts are novel low-temperature denitrification catalysts that have been extensively studied in recent years, possessing advantages such as high low-temperature denitrification activity and no secondary pollution. Chinese invention patent CN105854932A discloses a Cu-Mn bimetallic composite low-temperature denitrification catalyst and its preparation method. This catalyst achieves a NO conversion rate of over 90% within the temperature range of 180–350℃. However, current preparation devices for CuMn denitrification catalysts typically employ batch reactors. Traditional batch reactors usually shut off the feed pump after the initial feeding is complete. When the mixed solution is drawn into the batch reactor, the non-continuous extraction leads to material inhomogeneity and backmixing. For example, if the feeding time is 1 hour, the material entering the reactor in the first 5 minutes will be different from the material entering in the last 5 minutes. Utility Model Content

[0004] The purpose of this invention is to provide a preparation system for CuMn denitrification catalyst, which improves the uniformity of material preparation.

[0005] This invention provides a preparation system for CuMn denitrification catalyst, comprising a liquid storage device, a reaction vessel, a rinsing device, and at least two aging vessels connected in parallel. A stirrer is installed in both the reaction vessel and the aging vessel. The liquid storage device is connected to the inlet of the reaction vessel via a pump. An overflow port is provided at the top of the side of the reaction vessel, and the aging vessel is connected to the overflow port. Each aging vessel is connected to the rinsing device, and valves are provided on the connecting pipes between each aging vessel and the overflow port, and on the connecting pipes between each aging vessel and the rinsing device.

[0006] Furthermore, it also includes a controller, and the liquid storage device, flushing device and valve are all electrically connected to the controller.

[0007] Furthermore, the liquid storage device includes a first liquid storage tank and a second liquid storage tank for holding different mixed solutions. The first liquid storage tank is connected to the reaction vessel through a first pipe, and the first pipe is equipped with a first pump and a first valve. The second liquid storage tank is connected to the reaction vessel through a second pipe, and the second pipe is equipped with a second pump and a second valve. The first pump, the first valve, the second pump, and the second valve are all electrically connected to the controller.

[0008] Furthermore, each of the aging vessels is provided with a liquid inlet at its top, which is connected to the overflow port, and the valve is installed at the liquid inlet.

[0009] Furthermore, the rinsing device includes a pure water tank, a rinsing pump, a rinsing main pipe, and rinsing branch pipes corresponding to different aging kettles. The rinsing pump is installed on the rinsing main pipe, and valves are installed on the rinsing main pipe and each of the rinsing branch pipes. The rinsing pump and valves are electrically connected to the controller.

[0010] Furthermore, the outer sides of the reaction vessel and each of the aging vessels are covered with heating jackets.

[0011] Furthermore, temperature sensors are installed inside both the reaction vessel and the aging vessel.

[0012] Furthermore, a pH sensor is installed inside the reactor.

[0013] Furthermore, each of the reaction vessels and each of the aging vessels is provided with a drain pipe at its bottom, and each drain pipe is equipped with a valve.

[0014] Furthermore, the height at which the ends of the first pipe and the second pipe extend into the reactor is lower than the height at which the overflow port is located.

[0015] The beneficial effects of this technical solution are as follows: Given the problems of material inhomogeneity and backmixing in traditional batch reactor preparation of CuMn denitration catalysts, this preparation system, by setting up at least two parallel aging reactors to work in conjunction with the reactor, allows the reacted material in the reactor to flow through overflow ports into different aging reactors for subsequent processing. This avoids the material differences caused by discontinuous solution extraction during the feeding process in traditional batch reactors, improving material uniformity. Simultaneously, agitators are installed in both the reactor and the aging reactors to further promote uniform mixing. Furthermore, the aging reactors are connected to a flushing device, and valves are installed on each connecting pipeline, facilitating timely flushing of the aging reactors after unloading during the preparation process. This prevents material residue from affecting subsequent preparations. After cleaning, the aging reactors can be refilled with material. The setup of multiple aging reactors and the continuous pumping of the mixed solution material contribute to improving the uniformity of catalyst preparation. Attached Figure Description

[0016] 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.

[0017] Figure 1 This is a system structure diagram of the present invention.

[0018] Explanation of reference numerals in the attached drawings: 1-Reaction vessel, 101-Overflow port, 2-First aging vessel, 3-Second aging vessel, 4-First storage tank, 5-Second storage tank, 6-First pipeline, 7-Second pipeline, 8-First pump, 9-Second pump, 10-First valve, 11-Second valve, 12-First stirrer, 13-Second stirrer, 14-Third stirrer, 15-Pure water tank, 16-Flush main pipe, 17-Flush pump, 18-Fifth valve, 19-Seventh valve, 20-Sixth valve, 21-Third valve, 22-Fourth valve, 23-Eighth valve, 24-Ninth valve, 25-Tenth valve. Detailed Implementation

[0019] 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.

[0020] 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.

[0021] 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.

[0022] Example 1

[0023] like Figure 1 As shown, this utility model provides a preparation system for CuMn denitrification catalyst, including a liquid storage device, a reaction vessel 1, a rinsing device, and two aging vessels connected in parallel (for ease of distinction, the two aging vessels are named the first aging vessel 2 and the second aging vessel 3, respectively). A first stirrer 12 is installed in the reaction vessel 1, a second stirrer 13 is installed in the first aging vessel 2, and a third stirrer 14 is installed in the second aging vessel 3. The reaction vessel 1 and each aging vessel are covered with a heating jacket, which is used to heat the reaction vessel 1 and the aging vessel, respectively.

[0024] The liquid storage device is connected to the inlet of the reactor 1 via a pump. The liquid storage device includes a first storage tank 4 and a second storage tank 5 for storing different mixed solutions. The first storage tank 4 is connected to the reactor 1 via a first pipe 6, which is equipped with a first pump 8 and a first valve 10. The second storage tank 5 is connected to the reactor 1 via a second pipe 7, which is equipped with a second pump 9 and a second valve 11. The ends of the first pipe 6 and the second pipe 7 extend into the reactor 1 at a height lower than the overflow port 101 to prevent the solution from flowing directly out of the overflow port 101 after entering the reactor 1. The first storage tank 4 stores a mixed solution of copper nitrate and manganese nitrate, with a molar ratio of Cu to Mn of 1:1 to 1:5. The second storage tank 5 stores a mixed solution of NaOH and Na2CO3, with a molar ratio of NaOH to Na2CO3 of 1:2 to 1:5.

[0025] The top of the side of the reactor 1 is provided with an overflow port 101, which allows the reactor 1 to feed and discharge at the same time. The top of the first aging reactor 2 and the second aging reactor 3 are both provided with liquid inlets that are connected to the overflow port 101. A third valve 21 is installed at the liquid inlet of the first aging reactor 2, and a fourth valve 22 is installed at the liquid inlet of the second aging reactor 3.

[0026] Both aging vessels are connected to a rinsing device, which includes a pure water tank 15, a rinsing pump 17, a rinsing main pipe 16, a first rinsing branch pipe, and a second rinsing branch pipe. The first rinsing branch pipe and the second rinsing branch pipe correspond to the first aging vessel 2 and the second aging vessel 3, respectively. The rinsing pump 17 is installed on the rinsing main pipe 16. A fifth valve 18 is installed on the rinsing main pipe 16. A sixth valve 20 is installed on the first rinsing branch pipe, and a seventh valve 19 is installed on the second rinsing branch pipe.

[0027] The bottom of the reactor 1 and each aging vessel is equipped with a drain pipe. The drain pipe at the bottom of the reactor 1 is equipped with an eighth valve 23, the drain pipe at the bottom of the first aging vessel 2 is equipped with a ninth valve 24, and the drain pipe at the bottom of the second aging vessel 3 is equipped with a tenth valve 25.

[0028] Temperature sensors are installed in both reactor 1 and the two aging reactors to detect the temperature of the internal solution. A pH sensor is installed in reactor 1.

[0029] To achieve intelligent control of the system, a controller can be set up. The liquid pump, flushing pump 17, stirrer, valve, temperature sensor and pH sensor are all electrically connected to the controller. When the system is running, the pH value of the mixed solution in the reaction vessel 1 can be stabilized at 8-12 by controlling the flow rate of the liquid pump.

[0030] The aging time of the materials in the first aging vessel 2 and the second aging vessel 3 is 2 to 8 hours. After the aging time is reached, the materials are discharged from the drain pipe and then pure water is introduced from the pure water tank 15 to clean the aging vessels. This system can be set up with multiple aging vessels connected in parallel.

[0031] Working principle

[0032] First, deionized water is added to reactor 1 as the base material. Then, the heating jackets covering the outside of reactor 1, first aging reactor 2, and second aging reactor 3 are activated to heat the solution temperature inside the reactors to 60°C. The first stirrer 12 is activated and the speed is adjusted to 1000 rpm. The second stirrer 13 and the third stirrer 14 are activated and the speed is adjusted to 500 rpm.

[0033] Start the first pump 8, the second pump 9, the first valve 10 and the second valve 11 to simultaneously inject the mixed solution of copper nitrate and manganese nitrate in the first storage tank 4 and the mixed solution of NaOH and Na2CO3 in the second storage tank 5 into the reactor 1. Control the flow rate of the first pump 8 and the second pump 9 to stabilize the pH value of the solution in the reactor 1 at 10.

[0034] Open the third valve 21 and introduce the mixed solution overflowing from the overflow port 101 into the first aging vessel 2. After filling, close the third valve 21 and age the mixed solution in the first aging vessel 2 for 4 hours.

[0035] Open the fourth valve 22 and introduce the mixed solution overflowing from the overflow port 101 into the second aging vessel 3. After filling, close the fourth valve 22 and age the mixed solution in the second aging vessel 3 for 4 hours.

[0036] After the mixed solution in the first aging vessel 2 has aged for 4 hours, open the ninth valve 24 to unload the material from the vessel. Then, close the ninth valve 24 and open the flushing pump 17, the fifth valve 18, and the sixth valve 20 to introduce pure water from the pure water tank 15 into the first aging vessel 2. After cleaning, close the flushing pump 17, the fifth valve 18, and the sixth valve 20. Then, open the third valve 21 again to introduce the mixed solution overflowing from the overflow port 101 back into the first aging vessel 2. After filling, close the third valve 21, and the first aging vessel 2 will begin aging of the mixed solution again. After the mixed solution in the second aging vessel 3 has aged for 4 hours, follow the same procedure.

[0037] After the reaction is complete, the first pump 8, the second pump 9, the first valve 10, and the second valve 11 are shut off, and the eighth valve 23 is opened to discharge the mixed solution from reactor 1. The mixed solution from reactor 1, the first aging reactor 2, and the second aging reactor 3 is discharged, filtered, washed, dried, and calcined to obtain the CuMn denitration catalyst.

[0038] 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 system for preparing a CuMn depletion catalyst, characterized by, The device comprises a liquid storage device, a reaction kettle, a flushing device and at least two parallel aging kettles, wherein a stirrer is installed in each of the reaction kettle and the aging kettles, the liquid storage device is communicated with the liquid inlet of the reaction kettle through a liquid pumping device, the top end of the side of the reaction kettle is provided with an overflow port, and the aging kettles are communicated with the overflow port; each of the aging kettles is communicated with the flushing device, and a valve is arranged on the communication pipeline between each of the aging kettles and the overflow port and on the communication pipeline between each of the aging kettles and the flushing device.

2. The CuMn redox catalyst preparation system according to claim 1, characterized by, A controller is further arranged, and the liquid storage device, the flushing device and the valves are electrically connected with the controller.

3. The CuMn redox catalyst preparation system according to claim 2, characterized in that, The liquid storage device comprises a first liquid storage tank and a second liquid storage tank for containing different mixed solutions, the first liquid storage tank is communicated with the reaction kettle through a first pipeline, and a first liquid pumping device and a first valve are arranged on the first pipeline; the second liquid storage tank is communicated with the reaction kettle through a second pipeline, and a second liquid pumping device and a second valve are arranged on the second pipeline, and the first liquid pumping device, the first valve, the second liquid pumping device and the second valve are electrically connected with the controller.

4. The CuMn redox catalyst preparation system according to claim 1, characterized by, The top end of each of the aging kettles is provided with a liquid inlet communicated with the overflow port, and the valve is installed at the liquid inlet.

5. The CuMn redox catalyst preparation system according to claim 2, wherein, The flushing device comprises a pure water tank, a flushing pump, a flushing main pipeline and flushing branch pipelines corresponding to different aging kettles, the flushing pump is installed on the flushing main pipeline, a valve is installed on the flushing main pipeline and each of the flushing branch pipelines, and the flushing pump and the valves are electrically connected with the controller.

6. The CuMn redox catalyst preparation system according to claim 2, wherein The outer side of the reaction kettle and each of the aging kettles is covered with a heating jacket.

7. The CuMn redox catalyst preparation system according to claim 6, characterized by A temperature sensor is installed in each of the reaction kettle and the aging kettles.

8. The CuMn redox catalyst preparation system according to claim 2, characterized by, A pH value sensor is installed in the reaction kettle.

9. The CuMn redox catalyst preparation system of claim 1, wherein, The bottom end of the reaction kettle and each of the aging kettles is provided with a liquid discharge pipeline, and a valve is installed on the liquid discharge pipeline.

10. The CuMn redox catalyst preparation system according to claim 3, characterized by, The height position of the end of the first pipeline and the second pipeline extending into the reaction kettle is lower than the height position of the overflow port.

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