A multifunctional SCR catalyst structure for waste gas purification

Abstract

This utility model relates to the field of SCR catalysts and discloses a multifunctional SCR catalyst structure for waste gas purification. It includes a main body with multiple main air ducts, multiple disturbance air ducts, and multiple regulating air ducts inside. Multiple turbulence blocks are fixedly connected inside the main air ducts. The main air ducts and the disturbance air ducts are connected through mixing holes. The main air ducts are rhomboid in shape, and the disturbance air ducts are isosceles triangles. In this utility model, the rhomboid main air ducts and triangular prism shape reduce dust adhesion. The micro-vortices formed by the turbulence blocks cutting the airflow continuously disturb the airflow within the air ducts, preventing dust accumulation on the walls. The isosceles triangular disturbance air ducts, through the mixing holes, form an airflow circulation with the main air ducts, carrying accumulated dust from the gap areas into the main airflow for discharge. The synergistic effect of these multiple structures significantly reduces the probability of dust accumulation in the tank.

Description

Technical Field

[0001] This invention relates to the field of SCR catalysts, and more particularly to a multifunctional SCR catalyst structure for waste gas purification. Background Technology

[0002] With the increasing severity of air pollution caused by nitrogen oxide emissions from industrial waste gas and vehicle exhaust, selective catalytic reduction (SCR) technology has emerged to meet increasingly stringent environmental regulations. SCR catalysts, as the core component of this technology, are widely used. They are primarily applied in industries requiring nitrogen oxide emission control, such as vehicle exhaust treatment, coal-fired power plants, waste incineration plants, and industrial boilers. Structurally, SCR catalysts typically use honeycomb, plate, or corrugated supports as the matrix, with active components and additives loaded on the support surface. Some also have coatings added to enhance the adhesion and stability of the active components. Their main function is to catalyze the reduction reaction of nitrogen oxides with a reducing agent under certain temperature conditions, converting toxic NOx into harmless nitrogen and water, thereby effectively reducing nitrogen oxide emissions and mitigating environmental problems such as acid rain and photochemical smog. Existing SCR catalysts often use square pores to increase the reaction area and increase the reaction rate, but the effect of such square pores on improving the reaction rate is still limited. Therefore, a multifunctional SCR catalyst structure for exhaust gas purification is proposed to solve the above problems. Utility Model Content

[0003] To overcome the above shortcomings, this invention provides a multifunctional SCR catalyst structure for waste gas purification, aiming to improve the problem of poor catalyst performance.

[0004] The multifunctional SCR catalyst structure for waste gas purification provided in this application adopts the following technical solution: A multifunctional SCR catalyst structure for exhaust gas purification includes a body, wherein multiple main air ducts, multiple disturbance air ducts, and multiple regulating air ducts are provided inside the body.

[0005] By adopting the above technical solution, the contact area between the catalyst and the reaction raw materials can be increased.

[0006] Preferably, multiple baffles are fixedly connected inside the main air duct.

[0007] By adopting the above technical solution, airflow can be cut to form micro vortices.

[0008] Preferably, the main air duct and the disturbance air duct are connected through a mixing hole.

[0009] By adopting the above technical solution, the two gas streams are fully mixed, thereby improving the uniformity of reactant concentration.

[0010] Preferably, the main air duct is rhomboid in shape.

[0011] By adopting the above technical solution, the diffusion rate of exhaust gas in the air duct is accelerated.

[0012] Preferably, the turbulence duct is an isosceles triangle.

[0013] By adopting the above technical solution, the narrow triangular channel can instantly increase the airflow velocity, forming a jet effect.

[0014] Preferably, the shape of the regulating air duct is elliptical.

[0015] By adopting the above technical solution, airflow resistance is increased to extend the reaction time.

[0016] Preferably, the main air ducts are arranged in a matrix.

[0017] By adopting the above technical solutions, it is ensured that the exhaust gas can be evenly distributed to each air duct.

[0018] Preferably, the regulating air ducts are symmetrically distributed along the centerline of the main air duct.

[0019] By adopting the above technical solution, the fluctuation of reaction efficiency caused by unilateral airflow fluctuations can be reduced.

[0020] In summary, this application includes at least one of the following beneficial technical effects: 1. In this utility model, the rhomboid main air duct and the triangular prism shape can reduce dust adhesion. The micro vortex formed by the baffle cutting the airflow can continuously disturb the airflow in the air duct and prevent dust from accumulating on the wall. The isosceles triangular baffle air duct forms an airflow circulation with the main air duct through the mixing hole, which can bring the accumulated dust in the gap area into the main airflow for discharge. The synergistic effect of multiple structures significantly reduces the probability of dust accumulation in the trough. 2. In this utility model, the main air duct is distributed in a matrix to ensure uniform distribution of exhaust gas and avoid excessive local reaction load; the rhomboid structure enhances the contact frequency between exhaust gas and catalyst, and the turbulence block further expands the contact area; the turbulence air duct achieves full mixing through the mixing hole to ensure that the reaction proceeds fully. The above design improves the overall catalytic reaction rate in terms of mass transfer efficiency, contact area, reaction time and other aspects. Attached Figure Description

[0021] Figure 1 This is a three-dimensional schematic diagram of the structure of a multifunctional SCR catalyst for waste gas purification proposed in this utility model. Figure 2This is a schematic diagram of the turbulence block of a multifunctional SCR catalyst structure for waste gas purification proposed in this utility model. Figure 3 This is a schematic diagram of the mixing pore structure of a multifunctional SCR catalyst structure for waste gas purification proposed in this utility model. Explanation of reference numerals in the attached diagram: 1. Main body; 2. Main air duct; 3. Disturbing air duct; 4. Regulating air duct; 5. Turbidator; 6. Mixing hole. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Reference Figures 1-3 This utility model provides an embodiment of a multifunctional SCR catalyst structure for waste gas purification, comprising a body 1, which has high temperature resistance and thermal shock resistance. Multiple main air ducts 2 are formed inside the body 1, serving as the main channels for waste gas flow. Multiple disturbance air ducts 3 are formed inside the body 1, distributed in the gaps between the main air ducts 2, which can create local turbulence in the airflow. Multiple regulating air ducts 4 are formed inside the body 1, extending along the axial direction of the body 1, and can dynamically adjust the flow cross-section according to the airflow velocity. Reference Figures 1-3 Multiple turbulence blocks 5 are fixedly connected inside the main air duct 2. The turbulence blocks 5 are triangular prisms arranged at intervals along the length of the main air duct 2. The spacing between adjacent turbulence blocks 5 is larger, and their edges face the direction of airflow. They can cut the airflow to form micro vortices and enhance the contact frequency between the reactants and the active surface of the catalyst. Reference Figures 1-3 The main air duct 2 and the disturbance air duct 3 are connected by a mixing hole 6. The mixing hole 6 is cylindrical and evenly distributed on the adjacent walls of the main air duct 2 and the disturbance air duct 3. It can divert part of the airflow in the main air duct 2 to the disturbance air duct 3, and at the same time guide the disturbed airflow back to the main air duct 2, so as to achieve full mixing of the two airflows and improve the uniformity of reactant concentration. Reference Figures 1-3 The main air duct 2 is rhomboid in shape. The sharp corners of the rhomboid structure can form local high-pressure zones, which can accelerate the diffusion rate of exhaust gas in the air duct. At the same time, the airflow disturbance at the corners can reduce the local wear of the catalyst active coating. Reference Figures 1-3The turbulent air duct 3 is shaped like an isosceles triangle. The narrow channel of the triangle can instantly increase the airflow velocity, forming a jet effect that impacts the airflow boundary layer in the main air duct 2, breaking the laminar flow state to improve mass transfer efficiency.

[0024] Reference Figures 1-3 The regulating duct 4 is elliptical in shape, with its major axis aligned with the extension direction of the main duct 2. The flat elliptical structure can reduce the flow cross-section by narrowing the minor axis at high airflow velocities, thereby increasing airflow resistance and extending the response time. At low flow velocities, the ample space along the major axis reduces pressure drop losses, enabling dynamic adaptation under different operating conditions. Reference Figures 1-3 The main air ducts 2 are arranged in a matrix, and the spacing between adjacent main air ducts 2 is consistent, forming a regular grid layout, which ensures that the exhaust gas can be evenly distributed to each air duct and avoids excessive local reaction load caused by concentrated airflow. Reference Figures 1-3 The regulating air ducts 4 are symmetrically distributed along the center line of the main air duct 2. The symmetrically arranged regulating air ducts 4 can form a balanced airflow buffer area on both sides of the main air duct 2. Through the coordinated regulation of both sides, the airflow pressure in the main air duct 2 is stabilized, and the fluctuation of reaction efficiency caused by unilateral airflow fluctuation is reduced.

[0025] Working principle: After entering the main body 1, the exhaust gas mainly flows along the matrix-distributed rhomboid main air duct 2. Inside the main air duct 2, triangular prism-shaped turbulence blocks 5 are arranged at intervals along the airflow direction. Their edges cut the airflow, forming micro-vortices that break the airflow boundary layer, allowing the exhaust gas to fully contact the catalyst active coating on the wall of the main air duct 2. Simultaneously, the main air duct 2 is connected to the adjacent isosceles triangular turbulence duct 3 through cylindrical mixing holes 6. Part of the airflow is diverted to the turbulence duct 3, forming a high-speed jet within the narrow triangular channel. After being turbulent, it flows back to the main air duct 2 through the mixing holes 6, mixing with the main airflow to form a more uniform reactant concentration field, improving mass transfer efficiency. The elliptical regulating ducts 4, symmetrically distributed along the centerline of the main air duct 2, dynamically adjust to the airflow velocity: when the velocity is high, the flow cross-section of the regulating duct 4 narrows along its minor axis, increasing airflow resistance to prolong the residence time of the exhaust gas within the main air duct 2, ensuring sufficient reaction; when the velocity is low, its major axis provides ample flow space, reducing pressure drop loss to maintain airflow stability. Through the vortex disturbance of the main air duct 2, the jet mixing of the disturbance duct 3, and the dynamic adaptation of the regulating duct 4, efficient diffusion and full reaction of the exhaust gas within the main body 1 are achieved, improving the overall denitrification and purification efficiency.

[0026] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A multifunctional SCR catalyst structure for exhaust gas purification, comprising a body (1), characterised in that: The main body (1) has multiple main air ducts (2), multiple disturbance air ducts (3), and multiple regulating air ducts (4) inside.

2. A multifunctional SCR catalyst structure for exhaust gas purification according to claim 1, characterized in that: The main air duct (2) is fixedly connected with multiple turbulence blocks (5).

3. The multifunctional SCR catalyst structure for waste gas purification according to claim 1, characterized in that: The main air duct (2) and the disturbance air duct (3) are connected through the mixing hole (6).

4. A multifunctional SCR catalyst structure for exhaust gas purification according to claim 1, characterized in that: The main air duct (2) is rhomboid in shape.

5. A multifunctional SCR catalyst structure for exhaust gas purification according to claim 1, characterized in that: The disturbance air duct (3) is an isosceles triangle in shape.

6. A multifunctional SCR catalyst structure for exhaust gas purification according to claim 1, characterized in that: The regulating air duct (4) is elliptical in shape.

7. The multifunctional SCR catalyst structure for waste gas purification according to claim 1, characterized in that: The main air duct (2) is distributed in a matrix.

8. A multifunctional SCR catalyst structure for exhaust gas purification according to claim 1, characterized in that: The regulating air duct (4) is symmetrically distributed along the center line of the main air duct (2).

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