Novel SCR air outlet end perforated plate turbulent flow structure

Abstract

The utility model provides a novel SCR (Selective Catalytic Reduction) air outlet end perforated plate turbulent flow structure which comprises a cylinder body, one end of the cylinder body is a funnel-shaped air outlet end cone, and a perforated plate is arranged on the inner side wall of the cylinder body; a plurality of second through holes are formed in the middle of the side wall of the perforated plate, a plurality of first through holes are formed in the side wall of the perforated plate, and third through holes are formed in the side wall of the perforated plate. The novel SCR air outlet end perforated plate turbulent flow structure has the advantage of improving the accuracy rate of the detection result of the NOx sensor.

Description

Technical Field

[0001] The utility model relates to the technical field of SCR catalysts, in particular to a novel SCR gas outlet end porous plate spoiler structure. Background Art

[0002] The main function of the SCR catalyst is to promote a chemical reaction between the reducing agent (such as urea or ammonia) and nitrogen oxides (NOx) in the flue gas under certain conditions, converting NOx into harmless nitrogen (N2) and water (H2O). This process can effectively reduce the NOx content in industrial emissions and automobile exhaust, thereby reducing environmental pollution and improving air quality.

[0003] After exhaust gas is treated by the SCR catalyst, a NOx sensor is used to measure the NOx value to detect whether the exhaust gas meets emission standards. However, the airflow at the outlet cone of the existing SCR is uneven, with the airflow mainly concentrated in the middle area. As a result, the NOx sensor at the outlet cone measures a small NOx value, which is inaccurate.

[0004] Therefore, it is necessary to provide a new type of SCR outlet porous plate spoiler structure to solve the above problems. Utility Model Content

[0005] The technical problem solved by the utility model is to provide a novel SCR outlet end porous plate spoiler structure which improves the accuracy of the detection result of the NOx sensor.

[0006] In order to solve the above technical problems, the new SCR outlet porous plate spoiler structure provided by the utility model includes: a cylinder, one end of which is a funnel-shaped outlet cone, and a porous plate is installed on the inner side wall of the cylinder; a plurality of second through holes are provided in the center of the side wall of the porous plate, a plurality of first through holes are provided on the side wall of the porous plate, and a third through hole is provided on the side wall of the porous plate.

[0007] Preferably, a liner is installed inside the cylinder, and a catalyst is installed inside the liner.

[0008] Preferably, the diameter of the second through holes is 4-8 mm, and the distance between adjacent second through holes is 10 mm.

[0009] Preferably, the diameter of the first through holes is 8-12 mm, and the distance between adjacent first through holes is 15.5 mm.

[0010] Preferably, a temperature sensor and a NOx sensor are installed obliquely on the surface of the outlet cone, and one end of the temperature sensor extends into the interior of the third through hole.

[0011] Preferably, the second through hole is arranged obliquely on the surface of the porous plate, and the inclination angle of the second through hole gradually decreases from the center of the porous plate toward the edge of the porous plate.

[0012] Compared with related technologies, the novel SCR outlet porous plate spoiler structure provided by the present invention has the following beneficial effects:

[0013] The utility model provides a novel SCR outlet porous plate turbulence structure, when the exhaust gas contacts the porous plate after being treated by the catalyst, since the outlet cone is funnel-shaped, the exhaust gas gradually converges at the center of the outlet cone, and the porous plate blocks the flow of exhaust gas. A plurality of second through holes are provided in the center of the side wall of the porous plate, and a plurality of first through holes are provided on the side wall of the porous plate. The diameter of the second through holes is smaller than that of the first through holes. When the airflow passes through the porous plate, it will be scattered. The second through holes quickly intercept the high-speed airflow and disperse the airflow to the second through holes around it, and the second through holes are arranged in the multi-holes. The surface of the orifice plate is arranged at an angle, and the inclination angle of the second through hole gradually decreases from the center of the porous plate toward the edge of the porous plate. The exhaust gas ejected from the second through hole also moves toward the edge of the cylinder. The exhaust gas at the outlet end of the cylinder is evenly distributed, ensuring that the airflow at the NOx sensor probe is more concentrated, so that the measured NOx is more accurate; the through holes on the surface of the porous plate are densely distributed, while ensuring gas uniformity, avoiding the problem of excessive overall exhaust back pressure; and the device has a simple structure and low cost, which can ensure that the NOx measurement value at the SCR outlet end is more accurate, so that the exhaust gas emissions meet the National VI standard. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 A schematic structural diagram of a preferred embodiment of the novel SCR outlet porous plate spoiler structure provided by the present utility model;

[0015] Figure 2 for Figure 1 Schematic diagram of the internal structure of the cylinder shown;

[0016] Figure 3 for Figure 2 Schematic diagram of the porous plate structure shown;

[0017] Figure 4 for Figure 2 Schematic diagram of the internal structure of the porous plate shown.

[0018] Numbers in the figure: 1. cylinder, 2. outlet cone, 3. temperature sensor, 4. NOx sensor, 5. catalyst, 6. porous plate, 61. first through hole, 62. second through hole, 63. third through hole, 7. gasket. DETAILED DESCRIPTION

[0019] The present invention will be further described below with reference to the accompanying drawings and implementation examples.

[0020] See also Figures 1 to 4 , Figure 1 A schematic structural diagram of a preferred embodiment of the novel SCR outlet porous plate spoiler structure provided by the present utility model; Figure 2 for Figure 1 Schematic diagram of the internal structure of the cylinder shown; Figure 3 for Figure 2 Schematic diagram of the porous plate structure shown; Figure 4 for Figure 2 The schematic diagram of the internal structure of the porous plate is shown. The novel SCR outlet porous plate flow disturbance structure comprises a cylinder 1, one end of which is a funnel-shaped outlet cone 2, and a porous plate 6 mounted on the inner sidewall of the cylinder 1. The porous plate 6 has a plurality of second through-holes 62 centrally located on its sidewall, a plurality of first through-holes 61, and a third through-hole 63. The diameter of the second through-holes 62 is 4 to 8 mm, with the spacing between adjacent second through-holes 62 being 10 mm. The diameter of the first through-holes 61 is 8 to 12 mm, with the spacing between adjacent first through-holes 61 being 15.5 mm. When the exhaust gas is processed by the catalyst 5 and contacts the porous plate 6, since the outlet cone 2 is funnel-shaped, the exhaust gas gradually converges at the center of the outlet cone 2, and the porous plate 6 blocks the flow of exhaust gas. A plurality of second through holes 62 are provided in the center of the side wall of the porous plate 6, and a plurality of first through holes 61 are provided on the side wall of the porous plate 6. The diameter of the second through holes 62 is smaller than the diameter of the first through holes 61. When the airflow passes through the porous plate 6, it will be broken up. The second through holes 62 quickly intercept the high-speed airflow and disperse the airflow to the second through holes 1 around it. The second through holes 61 are inclined on the surface of the porous plate 6. The exhaust gas ejected from the second through hole 62 is also moved toward the edge of the cylinder 1, and the exhaust gas at the outlet end of the cylinder 1 is evenly distributed, ensuring that the airflow at the probe of the NOx sensor 4 is more concentrated, so that the measured NOx is more accurate; the through holes on the surface of the porous plate 6 are densely distributed, ensuring that the gas is uniform while avoiding the problem of excessive overall exhaust back pressure.

[0021] A gasket 7 is installed inside the cylinder 1, and a catalyst 5 is installed inside the gasket 7 to facilitate the catalyst 5 to cause urea to chemically react with nitrogen oxides in the exhaust gas, converting NOx into harmless nitrogen and water, thereby reducing harmful substances in the exhaust gas.

[0022] The temperature sensor 3 and the NOx sensor 4 are installed on the surface of the outlet cone 2 at an angle, and one end of the temperature sensor 3 extends into the interior of the third through hole 63. In order to facilitate the temperature sensor 3 to effectively detect the temperature in the exhaust gas, the porous plate 6 is prevented from affecting the temperature sensor 3.

[0023] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the description and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A new type of SCR outlet porous plate spoiler structure, characterized by: include: A cylinder (1), one end of the cylinder (1) is a funnel-shaped air outlet cone (2), and a porous plate (6) is installed on the inner side wall of the cylinder (1); A plurality of second through holes (62) are provided at the center of the side wall of the porous plate (6), a plurality of first through holes (61) are provided on the side wall of the porous plate (6), and a third through hole (63) is provided on the side wall of the porous plate (6).

2. The novel SCR outlet porous plate spoiler structure according to claim 1 is characterized in that: A liner (7) is installed inside the cylinder (1), and a catalyst (5) is installed inside the liner (7).

3. The novel SCR outlet porous plate spoiler structure according to claim 1 is characterized in that: The diameter of the second through holes (62) is 4 to 8 mm, and the spacing between adjacent second through holes (62) is 10 mm.

4. The novel SCR outlet porous plate spoiler structure according to claim 1 is characterized in that: The diameter of the first through holes (61) is 8-12 mm, and the spacing between adjacent first through holes (61) is 15.5 mm.

5. The novel SCR outlet porous plate spoiler structure according to claim 1 is characterized in that: The temperature sensor (3) and the NOx sensor (4) are installed obliquely on the surface of the outlet cone (2), and one end of the temperature sensor (3) extends into the interior of the third through hole (63).

6. The novel SCR outlet porous plate spoiler structure according to claim 1 is characterized in that: The second through hole (62) is arranged obliquely on the surface of the porous plate (6), and the inclination angle of the second through hole (62) gradually decreases from the center of the porous plate (6) toward the edge of the porous plate (6).

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