Integral type porous catalyst semi-automatic vacuum coating device

Abstract

The utility model discloses an integral type porous catalyst semi-automatic vacuum coating device. The device comprises a vacuum pump, a storage tank, a balance, a gas / liquid guide pipe, an emptying valve, a gas / liquid guide valve, a vacuum coating chamber, a coating mold and a flow meter. According to the utility model, a continuous slurry adding and carrier vacuum coating method is adopted, so that automatic vacuum coating can be carried out on carriers with different parameters, and the purposes of improving the loading rate of a catalyst coating, optimizing the coating efficiency and simplifying the coating process are achieved.

Description

Technical Field

[0001] The utility model belongs to the field of catalytic material preparation, in particular to an integral porous catalyst semi-automatic vacuum coating device. Background Art

[0002] As my country's near-ground ozone pollution becomes increasingly serious, volatile organic compounds (VOCs), one of the precursors of ozone generation, are attracting more and more attention, and it is particularly important to strengthen their control. Catalytic oxidation technology is an effective VOCs control technology.

[0003] At present, many scholars have developed a large number of catalyst formulas for VOCs catalytic oxidation technology, but most catalyst research remains at the powder stage. However, in actual engineering applications, powder catalysts have problems such as large catalytic dosage, large bed pressure drop and easy clogging, which limits the direct application of powder catalysts. Compared with powder catalysts, monolithic catalysts have better mass transfer, heat transfer performance and thermal stability, as well as lower mass transfer pressure drop, and are suitable for industrial flue gas scenes with large air volume. Monolithic catalysts are mainly composed of active components, coatings and carriers. Among them, the active component is the core of the catalyst, which is loaded on the surface of the coating to provide active sites for catalytic reactions; the coating is a substance uniformly coated on the surface of the carrier, which can increase the specific surface area of ​​the carrier, enhance the binding force between the active component and the carrier, and improve the use efficiency of the active component; the carrier is the basic skeleton of the catalyst, which not only plays a supporting role, but also its regular pore structure is conducive to the circulation of reactants and products, thereby reducing the heat aggregation effect brought about by the exothermic reaction process. How to combine these three parts by technical means is the key to monolithic catalysts. Coating technology is currently a relatively mature monolithic catalyst preparation technology in the commercial market. This technology mainly prepares the powder catalyst into catalyst slurry, and then uses the adsorption performance of the carrier to load the required components onto the carrier surface. It has the advantages of simple process and easy operation. At the same time, by optimizing the preparation method, the amount of precious metals can be effectively reduced. It has excellent economic, environmental and social benefits.

[0004] The coating methods of monolithic catalysts include manual dipping coating, mechanical coating, spraying, etc. Mechanical coating mainly adopts positive pressure from bottom to top coating method, with fast coating speed and automatic continuous operation. However, when the slurry flows back, it often relies on its own gravity, resulting in uneven coating thickness, pore blockage and cracking. At the same time, the mechanical coating equipment is large in size and high in production cost. It is costly for small-scale production and product testing, and is prone to material waste. The manual dipping method mainly relies on manually dipping the honeycomb ceramic carrier into the coating slurry, taking it out after a certain period of soaking, flushing the pores to avoid blockage, and then preparing the catalyst through drying, roasting and other processes. The manual dipping method is easy to operate and the equipment is easy to maintain, but its coating thickness is uneven and the load capacity is unstable, which can easily lead to pore blockage or coating shedding and cracking, seriously affecting the catalyst effect. The spraying method is to coat the catalyst on the surface of the carrier through a spraying device. The coating uniformity is high and the coating thickness can be controlled. However, the spraying process may cause particle loss and particle size changes, and has high requirements for equipment. In addition, the coating amount of the catalyst is an important indicator of the integral catalyst. During the preparation process, it is often necessary to take out the catalyst and weigh it to determine whether the preparation meets the standards, which is a cumbersome operation.

[0005] Therefore, a simple and easy-to-operate coating device and method are developed to improve the uniformity of the integral catalyst coating, reduce the shedding rate caused by uneven thickness, and achieve efficient coating of the integral catalyst. Summary of the invention

[0006] The main purpose of the utility model is to provide an integral porous catalyst semi-automatic vacuum coating device to achieve semi-automatic vacuum coating of carriers of different materials, shapes and sizes, so as to improve the catalyst coating loading rate and uniformity and optimize the preparation process.

[0007] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0008] A semi-automatic vacuum coating device for an integral porous catalyst: comprising a vacuum pump, a storage tank, a vacuum coating chamber and a balance; the vacuum pump is connected to the storage tank through an air / liquid pipe, and the storage tank is connected to the vacuum coating chamber through an air / liquid pipe; the vacuum coating chamber is placed on a balance; a coating mold is placed inside the vacuum coating chamber for placing cordierite honeycomb ceramic carriers of different sizes. In the utility model, the change in mass before and after coating is weighed by a balance to determine whether the coating amount of the integral catalyst meets the standard.

[0009] Further preferably, the top and the bottom of the storage tank are both provided with air / liquid pipes connected to the top and the bottom of the vacuum coating chamber.

[0010] Further preferably, a flow meter is provided on the connecting air duct between the vacuum pump and the storage tank, and the flow meter is a rotor flow meter or a mass flow meter.

[0011] Further preferably, a gas / liquid valve is provided on the gas / liquid pipe between the storage tank and the vacuum coating chamber.

[0012] Further preferably, the vacuum pump includes a first vacuum pump and a second vacuum pump; the material storage tank includes a first material storage tank and a second material storage tank; the first vacuum pump and the second vacuum pump, the first material storage tank and the second material storage tank are symmetrically arranged on both sides of the vacuum coating chamber.

[0013] Further preferably, a first flow meter is provided on the air guide pipe between the first vacuum pump and the first storage tank.

[0014] Further preferably, a second flow meter is provided between the second vacuum pump and the second storage tank.

[0015] Further preferably, a first vent valve and a second vent valve are respectively provided on the top of the first storage tank and the second storage tank.

[0016] Further preferably, the gas / liquid valve is a first gas / liquid valve, a second gas / liquid valve, a third gas / liquid valve and a fourth gas / liquid valve.

[0017] Further preferably, the gas / liquid valve and the vent valve can be controlled manually or by a PLC system.

[0018] Further preferably, the vacuum coating chamber and the coating mold are both transparent and visible.

[0019] Further preferably, the gas / liquid pipe of the storage tank can be changed in length according to actual needs.

[0020] The above device is used to realize semi-automatic vacuum coating of monolithic porous catalyst, which mainly includes the following steps:

[0021] 1. Turn on the vacuum pump before use and check the air tightness of the device;

[0022] 2. Place the porous catalyst carrier in the coating mold and place the coating slurry in the storage tank;

[0023] 3. Open the second vacuum pump and the first vent valve, and control the amount of air pumped by the flow meter, thereby controlling the air pumping rate and the slurry coating speed. Open the second gas / liquid valve and the third gas / liquid valve, and use the suction of the second vacuum pump to draw the coating slurry in the storage tank into the coating mold through the liquid guide pipe, and let the slurry flow through the porous catalyst carrier pores until it is completely submerged;

[0024] 4. Close the second gas / liquid valve and the third gas / liquid valve to put the vacuum coating chamber in a vacuum state, and allow the porous catalyst carrier to fully contact the slurry under a vacuum environment. After the porous carrier is fully soaked, open the first gas / liquid valve and the fourth gas / liquid valve, and use the suction of the second vacuum pump to flow the slurry in the coating mold and the slurry remaining in the carrier pores into the second storage tank through the liquid guide pipe, and continue to use wind to blow the surface of the catalyst carrier to achieve preliminary drying. During this period, the speed at which the slurry is extracted from the catalyst carrier can be controlled by the second flowmeter. Then close the fourth gas / liquid valve and the first gas / liquid valve in turn, open the second vent valve and wait for the vacuum coating chamber and the second storage tank to return to normal pressure to complete a coating.

[0025] 5. Use a balance to determine whether the coating amount meets the standard. If not, close the first vent valve, open the second vacuum pump and the first and fourth gas / liquid valves, let the slurry in the second storage tank enter the vacuum coating chamber again, and then close the first and fourth gas / liquid valves to allow the porous catalyst carrier to fully contact the slurry under a vacuum environment. After the porous carrier is fully soaked, open the second and third gas / liquid valves, use the suction of the first vacuum pump to flow the slurry in the coating mold and the slurry remaining in the carrier pores into the first storage tank through the liquid guide tube, and continue to use wind to blow the surface of the catalyst carrier to achieve preliminary drying. Then close the third gas / liquid valve and the second gas / liquid valve in turn, open the first vent valve and wait for the vacuum coating chamber and the second storage tank to return to normal pressure, and complete the second coating of the catalyst carrier. Use a balance to determine whether the coating amount meets the standard. If not, continue the above coating operation.

[0026] The utility model adopts a continuous slurry addition and carrier vacuum coating method, which can realize automatic vacuum coating of carriers with different parameters, so as to achieve the purpose of improving the catalyst coating loading rate, optimizing the coating efficiency and simplifying the coating process.

[0027] Compared with the prior art, the advantages of the utility model are:

[0028] (1) The continuous slurry addition and carrier coating method is adopted, and there is no need to frequently take out the carrier and weigh it to determine whether the coating amount meets the standard, which simplifies the coating process and improves the coating efficiency;

[0029] (2) The vacuum negative pressure coating method is adopted, the one-time coating loading rate is high, the channel blockage rate is low, and the coating efficiency is high;

[0030] (3) The coating operation is highly flexible. For slurries with different viscosities and solid contents, the coating speed can be controlled and optimized by a flow meter.

[0031] (4) The coating mold has a flexible shape and can be used to coat catalyst carriers of different sizes and shapes. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0033] Figure 2 It is a structural schematic diagram of the coating mold in the utility model.

[0034] Figure 3 This is a physical picture of the integral catalyst product after coating.

[0035] The components in the figure are as follows:

[0036] The first vacuum pump 1, the second vacuum pump 2, the first storage tank 3, the second storage tank 4, the balance 5, the gas / liquid pipe 6, the first vent valve 7, the second vent valve 10, the first gas / liquid valve 8, the second gas / liquid valve 9, the third gas / liquid valve 11, the fourth gas / liquid valve 12, the vacuum coating chamber 13, the coating mold 14, the first flow meter 15, the second flow meter 16, and the gas / liquid pipe interface 17. DETAILED DESCRIPTION

[0037] The following description combines specific illustrations to explain the technical solution so as to fully understand the present invention. However, the present invention can be implemented in many other ways different from those described herein, and similar generalized embodiments made by ordinary technicians in the field without creative work are all within the scope of protection of the present invention.

[0038] The terms used in this specification are for the purpose of describing specific embodiments only and are not intended to limit this specification. The singular forms of "a", "the" and "the" used in one or more embodiments of this specification and the appended claims are also intended to include plural forms unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used in one or more embodiments of this specification refers to and includes any or all possible combinations of one or more associated listed items.

[0039] Example 1

[0040] Reference Figure 1, an integrated porous catalyst semi-automatic vacuum coating device, comprising a vacuum pump, a storage tank, a vacuum coating chamber 13 and a balance; the vacuum pump is connected to the storage tank through an air / liquid pipe 6, and the storage tank is connected to the vacuum coating chamber 13 through an air / liquid pipe 6; the vacuum coating chamber 13 is placed on a balance 5; a coating mold 14 is placed inside the vacuum coating chamber 13. The top and bottom of the storage tank are both provided with air / liquid pipes 6 connected to the top and bottom of the vacuum coating chamber 13. A flow meter is provided on the connecting air pipe 6 between the vacuum pump and the storage tank. An air / liquid valve is provided on the air / liquid pipe 6 between the storage tank and the vacuum coating chamber 13. The vacuum pump comprises a first vacuum pump 1 and a second vacuum pump 2; the storage tank comprises a first storage tank 3 and a second storage tank 4; the first vacuum pump 1 and the second vacuum pump 2, the first storage tank 3 and the second storage tank 4 are symmetrically arranged on both sides of the vacuum coating chamber 13. A first flowmeter 15 is provided on the air pipe 6 between the first vacuum pump 1 and the first storage tank 3. A second flowmeter 16 is provided between the second vacuum pump 2 and the second storage tank 4. A first vent valve 7 and a second vent valve 10 are provided on the top of the first storage tank 3 and the second storage tank 4, respectively. The air / liquid valve and the vent valve are controlled manually or by a PLC system. The air / liquid valves are the first air / liquid valve 8, the second air / liquid valve 9, the third air / liquid valve 11 and the fourth air / liquid valve 12.

[0041] Figure 2 It is the relevant drawing of the coating mold in the utility model, from Figure 2 As can be seen in the figure, a gas / liquid pipe interface 17 is provided at the bottom of the coating mold 14.

[0042] Figure 3 This is a physical picture of the integral catalyst product after coating.

[0043] In this embodiment, each connection is provided with a gasket and a sealing ring to ensure air tightness.

[0044] The utility model can adjust the vacuum coating chamber and the coating mold according to the different parameters of the catalyst carrier used to achieve the coating of different types of catalysts. Figure 1 The porous catalyst support is coated after being assembled in the form of a porous catalyst support. The specific steps are as follows:

[0045] 1. After assembling the coating device, turn on the vacuum pump and check the air tightness of the device;

[0046] 2. Place the porous catalyst carrier in the coating mold 14, and place the coating slurry in the first storage tank 3;

[0047] 3. Open the second vacuum pump 2 and the first vent valve 7, and control the amount of air pumped by the flow meter, thereby controlling the air pumping rate and the slurry coating speed. Open the second gas / liquid valve 9 and the third gas / liquid valve 11, and use the suction force of the second vacuum pump 2 to pump the coating slurry in the first storage tank 3 into the coating mold 14 through the liquid guide pipe, and allow the slurry to flow through the porous catalyst carrier pores until it is completely submerged;

[0048] 4. Close the second gas / liquid valve 9 and the third gas / liquid valve 11 to place the vacuum coating chamber 13 in a vacuum state, and allow the porous catalyst carrier to fully contact the slurry in a vacuum environment.

[0049] 5. After the porous carrier is fully soaked, the first gas / liquid valve 8 and the fourth gas / liquid valve 12 are opened, and the slurry in the coating mold and the slurry remaining in the carrier pores are flowed into the second storage tank 4 through the liquid guide pipe by the suction of the second vacuum pump 2, and the surface of the catalyst carrier is continuously blown by wind to achieve preliminary drying. During this period, the speed of the slurry being extracted from the catalyst carrier can be controlled by the second flow meter 16.

[0050] 6. Then close the fourth gas / liquid valve 12 and the first gas / liquid valve 8 in sequence, open the second vent valve 10 and wait for the vacuum coating chamber 13 and the second material storage tank 4 to return to normal pressure, and complete one coating.

[0051] 7. Determine whether the coating amount meets the standard by using the balance 5. If not, close the first vent valve 7, open the second vacuum pump 2 and the first gas / liquid valve 8 and the fourth gas / liquid valve 12, allow the slurry in the second storage tank 4 to enter the vacuum coating chamber again, and then close the first gas / liquid valve 8 and the fourth gas / liquid valve 12 to allow the porous catalyst carrier to fully contact with the slurry under a vacuum environment.

[0052] 8. After the porous carrier is fully soaked, open the second gas / liquid valve 9 and the third gas / liquid valve 11, and use the suction of the first vacuum pump 1 to let the slurry in the coating mold and the slurry remaining in the carrier pores flow into the first storage tank 3 through the liquid pipe, and continue to use wind to blow the surface of the catalyst carrier to achieve preliminary drying.

[0053] 9. Close the third gas / liquid valve 11 and the second gas / liquid valve 9 in sequence, open the first vent valve 7 and wait for the vacuum coating chamber 13 and the second storage tank 4 to return to normal pressure, and complete the second coating of the catalyst carrier.

[0054] 10. Use the balance 5 to determine whether the coating amount meets the standard. If not, take out the catalyst and obtain an integral catalyst by drying and calcining. If still not, continue the above coating operation.

[0055] It should be understood that although the terms first, second, etc. may be used to describe various information in one or more embodiments of this specification, this information should not be limited to these terms. These terms are only used to distinguish similar objects and are not necessarily used to describe the order or sequence of features described in one or more embodiments of this specification. In addition, the terms "having" and "including" are similarly expressed to indicate a non-exclusive scope. For example, a process, method, system, product or device that includes a series of steps or modules is not necessarily limited to the contents listed in detail, but may include inherent contents related to these steps or modules that are not listed.

Claims

1. A semi-automatic vacuum coating device for an integral porous catalyst, characterized in that: The invention comprises a vacuum pump, a material storage tank, a vacuum coating chamber (13) and a balance; the vacuum pump is connected to the material storage tank via an air / liquid pipe (6), and the material storage tank is connected to the vacuum coating chamber (13) via an air / liquid pipe (6); the vacuum coating chamber (13) is placed on the balance (5); and a coating mold (14) is placed inside the vacuum coating chamber (13).

2. The semi-automatic vacuum coating device for integral porous catalyst according to claim 1, characterized in that: The top and bottom of the material storage tank are both provided with gas / liquid pipes (6) connected to the top and bottom of the vacuum coating chamber (13).

3. The semi-automatic vacuum coating device for integral porous catalyst according to claim 1, characterized in that: A flow meter is provided on the air / liquid pipe (6) connecting the vacuum pump and the material storage tank.

4. The semi-automatic vacuum coating device for integral porous catalyst according to claim 1, characterized in that: An air / liquid valve is provided on the air / liquid pipe (6) between the material storage tank and the vacuum coating chamber (13).

5. The semi-automatic vacuum coating device for integral porous catalyst according to claim 1, characterized in that: The vacuum pump comprises a first vacuum pump (1) and a second vacuum pump (2); the material storage tank comprises a first material storage tank (3) and a second material storage tank (4); the first vacuum pump (1) and the second vacuum pump (2), the first material storage tank (3) and the second material storage tank (4) are symmetrically arranged on both sides of the vacuum coating chamber (13).

6. The semi-automatic vacuum coating device for integral porous catalyst according to claim 5, characterized in that: A first flow meter (15) is provided on the gas / liquid pipe (6) between the first vacuum pump (1) and the first material storage tank (3).

7. The semi-automatic vacuum coating device for integral porous catalyst according to claim 5, characterized in that: A second flow meter (16) is provided between the second vacuum pump (2) and the second material storage tank (4).

8. The semi-automatic vacuum coating device for integral porous catalyst according to claim 5, characterized in that: A first vent valve (7) and a second vent valve (10) are respectively provided at the top of the first material storage tank (3) and the top of the second material storage tank (4).

9. The semi-automatic vacuum coating device for integral porous catalyst according to claim 1, characterized in that: The air / liquid valves and vent valves are controlled manually or through a PLC system.

10. The semi-automatic vacuum coating device for integral porous catalyst according to claim 4, characterized in that: The gas / liquid valves are a first gas / liquid valve (8), a second gas / liquid valve (9), a third gas / liquid valve (11) and a fourth gas / liquid valve (12).

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