A high-efficiency anti-crystallization mixer device

Abstract

The present invention discloses a high-efficiency anti-crystallization mixer device, which aims to provide a mixer device with good crushing effect, less urea crystals and good discharge effect. The device can ensure that urea particles are fully crushed to make them easy to decompose; it can blow off part of the crystals to prevent continuous accumulation; it can improve the uniformity of gas flow, so that ammonia and exhaust gas are evenly mixed and then pass through the end face of the SCR carrier, thereby improving the catalytic reduction effect of the SCR. The key points of the technical solution are as follows. It includes a circular cylinder, a partition is provided in the circular cylinder, an air inlet is provided on the partition, a slot is also provided on the partition, a through hole corresponding to the slot is provided on the circular cylinder, a swirl tube is provided in the through hole, the swirl tube passes through the through hole and the slot to the bottom of the partition, a urea nozzle is also provided above the swirl tube, and a swirl plate is also provided at the end of the circular cylinder away from the air inlet.

Description

Technical Field

[0001] The invention relates to the field of automobile exhaust purification equipment, and in particular to a high-efficiency anti-crystallization mixer device. Background Art

[0002] At present, my country's National VI diesel vehicle standard is fully implemented, and the requirements for post-treatment are getting higher and higher. At present, the first choice for National VI diesel is SCR (Selective Catalytic Reduction Converter) technology. The principle of SCR technology is to use NH3 produced by high-temperature decomposition of urea aqueous solution, which reacts with NOx to produce N2 under the action of catalyst, thereby reducing NOx in the exhaust gas to meet the National VI emission standards.

[0003] Usually the mixer is arranged before the SCR, and the exhaust gas is discharged into the atmosphere after passing through the DOC, DPF, mixer, and SCR. Due to the vigorous promotion of high-efficiency engines, the calibrated urea injection volume is getting larger and larger, resulting in an increased risk of crystallization. Therefore, a high-efficiency anti-crystallization mixer is needed. In the case of large injection volume, it can not only meet the requirements of emission regulations, but also produce less crystallization. Summary of the invention

[0004] The object of the present invention is to provide a highly efficient anti-crystallization mixer device, which has the advantage of being able to ensure that urea particles are fully broken up so that they are easy to decompose.

[0005] The above technical objectives of the present invention are achieved through the following technical solutions:

[0006] A high-efficiency anti-crystallization mixer device comprises a circular cylinder, a partition is arranged inside the circular cylinder, an air inlet is arranged on the partition, a slot is also arranged on the partition, a through hole corresponding to the slot is arranged on the circular cylinder, a swirl tube is arranged in the through hole, the swirl tube passes through the through hole and the slot to the bottom of the partition, a urea nozzle is also arranged above the swirl tube, and a swirl plate is also arranged at one end of the circular cylinder away from the air inlet.

[0007] It is further provided that: a receiving plate obliquely connected to the partition is also provided on the side of the air inlet close to the swirl plate.

[0008] Further configuration: a crushing plate fixedly connected to the partition plate is provided above the receiving plate, and the crushing plate is inclined.

[0009] It is further configured that: the through hole is also provided with a reinforcing patch shell wrapped on the outer wall of the cyclone tube.

[0010] It is further configured that a nozzle base is provided between the swirl tube and the urea nozzle.

[0011] It is further configured that: a temperature sensor base is also provided on the outer wall of the circular cylinder and penetrates through the circular cylinder to the interior.

[0012] It is further provided that: a pressure difference sensor base is also provided on the outer wall of the circular cylinder and penetrates through the circular cylinder to the interior.

[0013] In summary, the present invention has the following beneficial effects:

[0014] (1) A double-layer plate is set in the mixer. One plate is a crushing hole plate, which can provide a crushing effect and improve the urea decomposition efficiency; the other plate is a crushed urea receiving plate to prevent urea from being sprayed into the dead zone of the air flow and causing accumulation that cannot be purged.

[0015] (2) A double-layer plate is set in the mixer, which plays a role in urea diversion, reduces the local cooling effect of urea hitting the wall surface, and is conducive to the decomposition of urea.

[0016] (3) Four air inlets are set in the mixer, and the air flow rate is reasonably distributed according to the size of the opening area to perform the purge and heat transfer functions.

[0017] (4) A lateral air inlet is provided in the mixer, and the main airflow laterally sweeps the urea on the plate surface to promote the crushing and decomposition of urea particles.

[0018] (5) An outlet cyclone plate is provided in the mixer to allow the decomposed ammonia and exhaust gas to rotate and mix evenly and reach the end face of the SCR carrier, thereby improving the conversion efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention is further described below in conjunction with the accompanying drawings.

[0020] Figure 1 It is a schematic diagram of the overall structure of a high-efficiency anti-crystallization mixer device;

[0021] Figure 2 It is a high-efficiency anti-crystallization mixer device used to show the internal structure schematic diagram.

[0022] In the figure, 1, cylinder; 2, partition; 3, air inlet; 4, slot; 5, through hole; 6, swirl tube; 7, urea nozzle; 8, swirl plate; 9, receiving plate; 10, crushing plate; 11, reinforced patch shell; 12, nozzle base; 13, temperature sensor base; 14, differential pressure sensor base. DETAILED DESCRIPTION

[0023] The specific implementation of the present invention will be further described below in conjunction with the accompanying drawings.

[0024] The technical solution adopted by the present invention is: a high-efficiency anti-crystallization mixer device, such as Figure 1 and Figure 2As shown, it includes a circular cylinder 1, a partition 2 is provided in the circular cylinder 1, two upper and lower horizontal air inlets 3 are provided on the partition 2, a slot 4 is also provided on the partition 2, a through hole 5 corresponding to the slot 4 is provided on the circular cylinder 1, a swirl tube 6 is provided in the through hole 5, and the swirl tube 6 passes through the through hole 5 and the slot 4 to the bottom of the partition 2, a urea nozzle 7 is also provided above the swirl tube 6, a swirl plate 8 is also provided at the end of the circular cylinder 1 away from the air inlet 3, a receiving plate 9 obliquely connected to the partition 2 is also provided on the side of the air inlet 3 close to the swirl plate 8, a crushing plate 10 fixedly connected to the partition 2 is also provided above the receiving plate 9, and the crushing plate 10 is inclined, a reinforcing patch shell 11 wrapped around the outer wall of the swirl tube 6 is also provided on the through hole 5, and a nozzle base 12 is also provided between the swirl tube 6 and the urea nozzle 7.

[0025] A temperature sensor base 13 penetrating the circular cylinder 1 to the interior is also provided on the outer wall of the circular cylinder 1 , and a differential pressure sensor base 14 penetrating the circular cylinder 1 to the interior is also provided on the outer wall of the circular cylinder 1 .

[0026] Its main working principle is as follows: the exhaust gas enters the mixer cavity through the swirl blades of the swirl tube 6, the two flanged blades and the circular hole of the partition 2, and the intake flow rate is reasonably distributed through the opening area to perform the purging and heat transfer functions. The crushing plate 10 and the receiving plate 9 are arranged parallel and tilted downward with an appropriate gap. The crushing plate 10 plays the role of crushing urea, and the receiving plate 9 plays the role of receiving the remaining urea. At the same time, the combination of the two plates plays the role of urea diversion. Before reaching the end face of the SCR carrier, the mixed gas is evenly mixed by the swirl plate 8 to improve the uniformity of the airflow. The urea nozzle 7 is installed on the nozzle base 12, and the nozzle base 122 swirl tube 6 is fixed in position by strengthening the patch shell 11 to ensure its coaxiality requirements. The crushing plate 10 and the receiving plate 9 are fixed to the notch of the partition 2 by their own pins to ensure the inclination angle requirements.

[0027] After the exhaust gas enters the exhaust system, it passes through the DPF by the DOC and then reaches the front face of the mixer. At this time, the gas is evenly distributed in the cross-sectional direction of the cylinder 1. The exhaust gas enters the mixer cavity through the swirl blades of the swirl tube 6, the two flanged blades and circular holes of the partition 2. The airflow in the swirl tube 6 plays a role in sweeping the small particles of the initial spray and replenishing the heat within the urea injection cone angle range; the two flanged blades of the partition 2 play a role in horizontally sweeping the urea on the surface of the crushing plate 10 and the receiving plate 9; the three circular holes of the partition 2 allow the gas in the lower area to flow, taking away the airflow in the cooling area of ​​the receiving plate 9 and replenishing the heat of the airflow. Subsequently, it is rotated and mixed again through the swirl plate 8 and enters the end face of the SCR carrier.

[0028] The above are only preferred embodiments of the present invention, and are not intended to limit the present invention in any form. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are within the scope of the technical solution of the invention.

Claims

1. A working method of a high-efficiency anti-crystallization mixer device, comprising a circular cylinder, a partition is arranged in the circular cylinder, two upper and lower horizontal air inlets are arranged on the partition, a slot is also arranged on the partition, a through hole corresponding to the slot is arranged on the circular cylinder, a swirl tube is arranged in the through hole, the swirl tube passes through the through hole and the slot to the bottom of the partition, a urea nozzle is also arranged above the swirl tube, a swirl plate is also arranged at the end of the circular cylinder away from the air inlet, a receiving plate obliquely connected to the partition is also arranged on the side of the air inlet close to the swirl plate, a crushing plate fixedly connected to the partition is also arranged above the receiving plate, the crushing plate is inclined, a reinforced patch shell wrapped on the outer wall of the swirl tube is also arranged on the through hole, and a nozzle base is also arranged between the swirl tube and the urea nozzle; a temperature sensor base penetrating the circular cylinder to the inside is also arranged on the outer wall of the circular cylinder, and a pressure difference sensor base penetrating the circular cylinder to the inside is also arranged on the outer wall of the circular cylinder; The working method comprises: The exhaust gas enters the mixer cavity through the swirl blades of the swirl tube, the two flanged blades and the circular holes of the partition. The intake air flow is reasonably distributed through the opening area to perform the purging and heat transfer functions. The crushing plate and the receiving plate are arranged in parallel and tilted downward with an appropriate gap. The crushing plate plays the role of crushing urea, and the receiving plate plays the role of receiving the remaining urea. At the same time, the combination of the two plates plays the role of urea diversion. Before the mixed gas reaches the end face of the SCR carrier, it is evenly mixed by the swirl plate to improve the uniformity of the airflow. The urea nozzle is installed on the nozzle base, and the swirl tube of the nozzle base is fixed in position by a reinforced patch shell to ensure its coaxiality requirements; The crushing plate and the receiving plate are fixed to the notches of the partition plate through their own latches to ensure the required tilt angle; After the exhaust gas enters the exhaust system, it passes through the DPF by the DOC and then reaches the front end face of the mixer. At this time, the gas is evenly distributed in the direction of the cylinder cross section; the exhaust gas enters the mixer cavity through the swirl blades of the swirl tube, the two flanged blades and circular holes of the partition, and the airflow in the swirl tube plays a role in blowing away the small particles of the initial spray and replenishing the heat within the urea injection cone angle range; the two flanged blades of the partition play a role in horizontally sweeping the urea on the surface of the crushing plate and the receiving plate; the three circular holes of the partition make the gas in the lower area flow, take away the airflow in the cooling area of ​​the receiving plate, and replenish the heat of the airflow; subsequently, it is rotated and mixed again through the swirl plate and enters the end face of the SCR carrier.

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