Natural gas Europe 7 catalytic converter and catalytic silencer post-processing assembly

Abstract

The utility model provides a natural gas Europe 7 catalytic converter and catalytic silencer post-processing assembly and a preceding-stage tight coupling catalytic converter. The natural gas Europe 7 catalytic converter and catalytic silencer post-processing assembly comprises a gas inlet flange connected with a supercharger, a gas inlet connecting pipe, a preceding-stage GOC unit packaging small assembly and a preceding-stage gas outlet flange connected with an exhaust pipe, meanwhile, the preceding-stage tight coupling catalytic converter is connected with the engine body through a connecting bracket; the post-stage linear catalytic silencer post-treatment assembly comprises a post-stage GOC small assembly, a post-stage particle trapping assembly, a post-stage mixer assembly and a post-stage selective catalytic reduction assembly which are connected in sequence, and the post-stage GOC small assembly is connected with an exhaust pipe; an electromagnetic nozzle is assembled on the rear-stage mixer assembly; and a front temperature sensor, a rear temperature sensor, a nitrogen-oxygen sensor and a differential pressure sensor are mounted on the rear-stage selective catalytic reduction assembly. The utility model provides a postprocessor assembly which can be used for efficiently treating tail gas at low cost and has the function of intercepting particulate matters in the tail gas.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the vehicle engine exhaust emission purification technology and energy -conserving and cost -reducing technical field, especially relate to natural gas Europe seven catalytic converter and catalytic muffler aftertreatment assembly. BACKGROUND

[0002] Europe seven regulation has issued, and heavy natural gas engine needs to reserve the technical scheme satisfying lower emission requirement, so as to meet the CH, CO and NOx in the tail gas are handled with high efficiency and low cost, and the function of intercepting particulate matters in the tail gas is simultaneously possessed. SUMMARY

[0003] The utility model provides natural gas Europe seven catalytic converter and catalytic muffler aftertreatment assembly, and its purpose is to provide the aftertreatment device assembly that can satisfy the function of intercepting particulate matters in the tail gas in the CH, CO and NOx in the tail gas are handled with high efficiency and low cost simultaneously.

[0004] The utility model discloses a technical scheme for:

[0005] Natural gas Europe seven catalytic converter and catalytic muffler aftertreatment assembly, characterized in that:

[0006] Including the front stage tight coupling catalytic converter installed on the engine and the linear catalytic muffler aftertreatment assembly installed on the chassis;

[0007] The front stage tight coupling catalytic converter includes the air inlet flange connected with the supercharger, the air inlet connecting pipe, the front stage GOC unit package small assembly and the front stage air outlet flange connected with the exhaust pipe in proper order;

[0008] Meanwhile, the front stage tight coupling catalytic converter is connected with the engine body through the connecting support;

[0009] The rear stage linear catalytic muffler aftertreatment assembly includes the rear stage GOC small assembly connected with the exhaust pipe, the rear stage particulate trap assembly, the rear stage mixer assembly and the rear stage selective catalytic reduction assembly in proper order;

[0010] The electromagnetic nozzle is assembled on the rear stage mixer assembly;

[0011] The front temperature sensor, the rear temperature sensor, the nitrogen oxygen sensor, the differential pressure sensor and the sensor support for fixing the above-mentioned sensor are installed on the rear stage selective catalytic reduction assembly.

[0012] The front stage tight coupling catalytic converter and the linear catalytic muffler aftertreatment assembly are split type.

[0013] The upper end of the connecting bracket of the front-stage close-coupled catalytic converter has a fixed frame with arc grooves and clamps on both sides of the arc grooves, and the lower end of the connecting bracket has a mounting plate for mounting to the engine body.

[0014] The connecting bracket includes a fixed frame with two arc grooves facing the same side and clamps on both sides of the arc grooves.

[0015] The particle trapping assembly at the rear stage is of a detachable structure.

[0016] The mixing core pipe is installed in the mixer assembly at the rear stage, and blade holes are evenly distributed in the circumferential direction of the mixing core pipe; the shape of the blade holes is rectangular, trapezoidal or triangular, and the side of the blade hole is an outwardly inclined blade.

[0017] The electromagnetic nozzle is installed on the end cover plate of the mixing core pipe in the mixer assembly at the rear stage. Advantages

[0018] 1. The front-stage close-coupled GOC + rear-stage GOC + GPF + SCR + ASC split technology route is adopted, which is compact in arrangement and small in space occupation.

[0019] 2. The front-stage close-coupled GOC + rear-stage GOC + GPF + SCR + ASC split technology route is adopted, which is higher in CH, CO and NOx conversion efficiency and meets lower emission requirements.

[0020] 3. The front-stage close-coupled catalytic converter is connected to the engine through the connecting bracket and can be individually disassembled and replaced.

[0021] 4. The blade holes opened in the circumferential direction of the mixing core pipe can form high-speed rotating airflow, so that the urea solution and the exhaust gas are mixed more uniformly, the NOx conversion efficiency is improved, and the risk of urea crystallization is effectively reduced.

[0022] 5. The particle trapping assembly at the rear stage is detachable, facilitating disassembly and maintenance of the vehicle. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the front-stage close-coupled catalytic converter.

[0024] Figure 2 It is a schematic diagram of the structure of the connecting bracket assembly.

[0025] Figure 3 It is a schematic diagram of the overall structure of the linear catalytic muffler aftertreatment assembly.

[0026] Figure 4 It is a top view of Figure 3 .

[0027] Figure 5 It is a schematic diagram of the structure of the mixer assembly at the rear stage.

[0028] In the drawings:

[0029] 1 - front stage tight coupling catalytic converter, 2 - rear stage linear catalytic muffler aftertreatment assembly, 110 - front stage intake flange, 120 - intake connecting pipe, 130 - front stage GOC unit packaging small assembly, 140 - front stage exhaust flange, 150 - front stage connecting bracket, 151 - clamp pull belt, 152 - bracket arc groove, 210 - rear stage GOC small assembly, 220 - rear stage particle capture assembly, 230 - rear stage mixer assembly, 240 - rear stage selective catalytic reduction assembly, 250 - front temperature sensor, 260 - nitrogen oxygen sensor, 270 - rear temperature sensor, 280 - electromagnetic nozzle, 290 - differential pressure sensor, 231 - mixing core pipe. DETAILED DESCRIPTION

[0030] The utility model will be made a further description in connection with the drawings and specific embodiments.

[0031] In order to more clearly illustrate the technical scheme of the utility model, the drawings needed to be used in the description will be simply introduced below, and obviously, the drawings in the following description are only some embodiments of the utility model, and other embodiments can also be obtained according to these drawings without the creative labor of the person skilled in the art.For the convenience of understanding the utility model, the utility model will be described in more detail in connection with the drawings and specific embodiments.

[0032] The utility model is a natural gas Europe seven tight coupling catalytic converter and rear stage linear catalytic muffler aftertreatment assembly, including the front stage tight coupling catalytic converter 1 installed on the engine and the linear catalytic muffler aftertreatment assembly 2 installed on the chassis.

[0033] As shown in Figure 1 ,

[0034] The front stage tight coupling catalytic converter 1 includes intake flange 110 connected in sequence, intake connecting pipe 120, front stage GOC unit packaging small assembly 130 and front stage exhaust flange 140 connected to the exhaust pipe.

[0035] As shown in Figure 3 , Figure 4 ,

[0036] The rear stage linear catalytic muffler aftertreatment assembly 2 includes rear stage GOC small assembly 210 connected in sequence, rear stage particle capture assembly 220 (GPF), rear stage mixer assembly 230, rear stage selective catalytic reduction assembly 240 (SCR + ASC) connected to the exhaust pipe.

[0037] The rear-stage mixer assembly 230 is equipped with an electromagnetic nozzle 280.

[0038] The front temperature sensor 250, the rear temperature sensor 270, the nitrogen oxygen sensor 260, the pressure difference sensor 290 and the sensor bracket for fixing the above devices are installed on the rear-stage selective catalytic reduction assembly 240.

[0039] The utility model discloses reach efficient low -cost aftertreatment system to the exhaust gas is handled to meet the reserve lower emission requirement.

[0040] The utility model discloses adopt front-stage tight coupling GOC + rear-stage GOC + GPF + SCR + ASC split type technical route.

[0041] As Figure 2 As

[0042] The connecting bracket 150 of the front-stage tight coupling catalytic converter 1 is: the fixed frame with two bracket arc grooves 152 towards the same side on the upper end and the clamp pull belt 151 on both sides of the bracket arc groove 152, and the lower end of the connecting bracket 150 has a mounting plate for mounting to the engine body.

[0043] The rear-stage particulate trap assembly 220 (GPF) is of detachable structure at both ends.

[0044] As Figure 5 As

[0045] The mixing core pipe 231 is installed in the rear-stage mixer assembly 230, and blade holes 232 are evenly distributed in the circumferential direction of the mixing core pipe.

[0046] The electromagnetic nozzle 280 is installed on one end cover plate of the mixing core pipe 231 in the rear-stage mixer assembly 230.

[0047] In actual use:

[0048] The engine exhaust gas flows into the front-stage tight coupling catalytic converter 1 from the supercharger, the supercharger and the front-stage air inlet flange 110 of the front-stage tight coupling catalytic converter 1 are connected through the clamp, the exhaust gas enters the front-stage GOC unit packaging small assembly 130 through the front-stage air inlet flange 110 and the air inlet connecting pipe 120, and the CH and CO in the exhaust gas are subjected to preliminary catalytic oxidation reaction to realize the preliminary purification of the CH and CO in the exhaust gas.

[0049] The exhaust gas flows into the rear linear catalytic muffler aftertreatment assembly 2 through the exhaust pipe, and the CH and CO in the exhaust gas are further catalytically oxidized by the rear GOC assembly 210 to achieve further purification of the CH and CO in the exhaust gas.

[0050] After the further catalytic oxidation reaction, the exhaust gas flows into the rear particle trapping assembly 220 connected to the rear GOC assembly 210 by a clamp, and the exhaust gas passes through the GPF unit of the rear particle trapping assembly 220 to intercept particulate matter in the exhaust gas, achieving purification of the particulate matter in the exhaust gas, and continuous (passive) regeneration can be achieved when the exhaust temperature reaches 250℃ or above.

[0051] After the particulate matter in the exhaust gas is purified, the exhaust gas enters the rear mixer assembly 230 connected to the rear particle trapping assembly 220 by a clamp, and the exhaust gas is fully mixed with NH3 after urea hydrolysis in the mixer assembly 230, and then enters the rear selective catalytic reduction assembly 240. When the exhaust gas passes through the SCR catalytic unit in the rear selective catalytic reduction assembly 240, the selective reduction reaction of NOx and NH3 is realized, achieving purification of NOx, while the excess NH3 is oxidized to N2 and H2O by the ASC catalytic unit in the rear selective catalytic reduction assembly 240. Finally, the purified exhaust gas flows into the exhaust tail pipe through the gas outlet flange of the rear selective catalytic reduction assembly 240 and is discharged into the atmosphere.

[0052] The electromagnetic nozzle 280 is installed on the end cover plate of the mixing core pipe 231 in the rear mixer assembly 230. The front temperature sensor 250 is arranged in front of the rear mixer assembly 230 to detect the front end temperature, and the rear temperature sensor 270 is arranged behind the rear mixer assembly 230 to detect the rear exhaust temperature. The nitrogen oxide sensor 260 is arranged in front of the rear mixer assembly 230 and behind the rear selective catalytic reduction assembly 240 to detect the NOx content of the exhaust gas before and after purification.

[0053] The rear mixer assembly 230 has a mixing core pipe 231 installed inside, which forms a high-speed rotating gas flow when the exhaust gas passes through the blades 233, making the urea solution mix more uniformly with the exhaust gas, improving the NOx conversion efficiency, and effectively reducing the risk of urea crystallization.

Claims

1. A natural gas Euro 7 catalytic converter and catalytic muffler aftertreatment assembly characterized by: The application relates to a front-stage close-coupled catalytic converter and a linear catalytic muffler aftertreatment assembly.

2. The natural gas Euro 7 catalytic converter and catalytic muffler aftertreatment assembly of claim 1, wherein: The front-stage close-coupled catalytic converter comprises, in sequence, an intake flange connected with a supercharger, an intake connecting pipe, a front-stage GOC unit encapsulated small assembly and a front-stage exhaust flange connected with an exhaust pipe; meanwhile, the front-stage close-coupled catalytic converter is connected with an engine body through a connecting support; the rear-stage linear catalytic muffler aftertreatment assembly comprises, in sequence, a rear-stage GOC small assembly connected with the exhaust pipe, a rear-stage particle trapping assembly, a rear-stage mixer assembly and a rear-stage selective catalytic reduction assembly; the rear-stage mixer assembly is provided with an electromagnetic nozzle; the rear-stage selective catalytic reduction assembly is provided with a front temperature sensor, a rear temperature sensor, an oxygen sensor, a differential pressure sensor and a sensor support for fixing the sensors.

3. The natural gas Euro 7 catalytic converter and catalytic muffler aftertreatment assembly of claim 1, wherein: The front-stage close-coupled catalytic converter and the linear catalytic muffler aftertreatment assembly are in a split type.

4. The natural gas Euro 7 catalytic converter and catalytic muffler aftertreatment assembly of claim 3, wherein: The connecting support is provided with a fixing frame with an arc groove at the upper end and a clamp on both sides of the arc groove, and the lower end of the connecting support is provided with a mounting plate for mounting on the engine body.

5. The natural gas Euro 7 catalytic converter and catalytic muffler aftertreatment assembly of claim 1, wherein: The connecting support comprises a fixing frame with two arc grooves on the same side and a clamp on both sides of the arc groove.

6. The natural gas Euro 7 catalytic converter and catalytic muffler aftertreatment assembly of claim 1, wherein: The rear-stage particle trapping assembly is provided with a detachable structure at both ends.

7. The natural gas Euro 7 catalytic converter and catalytic muffler aftertreatment assembly of claim 6, wherein: The rear-stage mixer assembly is provided with a mixing core pipe, and blade holes are arranged on the circumference of the mixing core pipe; the blade holes are in the shape of a rectangle, a trapezoid or a triangle, and the side of the blade hole is an outwardly inclined blade. The electromagnetic nozzle is mounted on one end cover plate of the mixing core pipe in the rear-stage mixer assembly.

Images