一种SCR后处理系统用混合器
By designing an SCR mixer without a broken perforated plate, and utilizing a high-speed rotating airflow and a Z-shaped baffle structure, non-contact mixing of urea droplets is achieved, solving the problem of urea crystallization blockage and improving the mixing uniformity and efficiency of the SCR post-treatment system.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- TIANJIN RUIHE ENVIRONMENTAL PROTECTION TECH CO LTD
- Filing Date
- 2025-07-30
- Publication Date
- 2026-07-17
AI Technical Summary
In existing SCR mixers, urea droplets are prone to crystallization and blockage, affecting the performance of the post-processor.
The system employs a non-breakable perforated plate structure, utilizing high-speed rotating airflow to mix urea droplets. Through the design of a swirling central tube, Z-shaped baffles, and an exhaust sleeve, non-contact mixing is achieved, reducing the contact time between urea droplets and the wall surface. Combined with a back-out exhaust method, a vortex is formed to improve mixing uniformity.
It effectively prevents urea crystallization and blockage, improves urea decomposition rate and ammonia uniformity, and enhances the mixing effect of the SCR aftertreatment system.
Smart Images
Figure CN224506786U_ABST
Abstract
Claims
1. A mixer for an SCR aftertreatment system, characterized by, Excluding the crushing orifice plate, the mixer cylinder (1), swirling center tube (2), front Z-shaped baffle (3), rear Z-shaped baffle (4), exhaust sleeve (5), exhaust sleeve base (6), exhaust orifice plate (7), nozzle seat (8), and nozzle seat hole (9) are provided. The nozzle seat hole (9) is provided at the center of one cylindrical side of the mixer cylinder (1), and the nozzle seat (8) is installed on the outside of the nozzle seat hole (9). The swirling center tube (2) is located inside the mixer cylinder (1) and its top end is connected to the inner wall of the mixer cylinder (1) where the nozzle seat hole (9) is located. The lower outer side of the swirling center tube (2) is sleeved with... Connect the outlet sleeve (5), install the outlet sleeve base (6) on the outer side of the bottom of the swirling center tube (2) and the bottom of the outlet sleeve (5), splice the front Z-shaped partition (3) and the rear Z-shaped partition (4) together to form a circular hole supporting the middle of the outer wall of the swirling center tube (2), and connect the front Z-shaped partition (3) and the rear Z-shaped partition (4) to the inner wall of the mixer cylinder (1) on both sides of the swirling center tube (2). The inner side of the mixer cylinder (1) is divided into an air inlet chamber and an air outlet chamber by the front Z-shaped partition (3) and the rear Z-shaped partition (4). An outlet plate (7) is provided at the outer end of the outlet chamber of the mixer cylinder (1).
2. A mixer for an SCR aftertreatment system as in claim 1, wherein, The nozzle seat hole (9), nozzle seat (8), swirling center tube (2), exhaust sleeve (5) and exhaust sleeve base (6) are coaxially arranged.
3. A mixer for an SCR aftertreatment system as in claim 1, wherein, The swirling central tube (2) has several purge holes (22) evenly spaced around the top end on its side wall. Each purge hole (22) has a corresponding elongated hole extending downward to near the center of the swirling central tube (2) and a blade (21) extending outward. The purge holes (22) and blades (21) are located in the air inlet chamber. The swirling central tube (2) has several air outlets (23) evenly spaced around the bottom end on its side wall. The air outlets (23), air outlet sleeves (5), and air outlet sleeve bases (6) are located in the air outlet chamber. The air outlet sleeves (55) have an air outlet (51) facing the air inlet chamber.
4. A mixer for an SCR aftertreatment system as in claim 1, wherein, Both the front Z-shaped partition (3) and the rear Z-shaped partition (4) have insertion holes (31). The top end of the exhaust sleeve (5) is provided with an insertion part (52) corresponding to the insertion holes (31) on the front Z-shaped partition (3) and the rear Z-shaped partition (4). The exhaust sleeve (5) is connected and fixed to the front Z-shaped partition (3) and the rear Z-shaped partition (4) through the insertion part (52) inserted into the insertion hole (31).