Removable Dosing Tray for SCR System Maintenance
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Solution Overview
Problem
In high horsepower applications, the formation of deposits from liquid reductants in exhaust systems reduces the efficiency of selective catalytic reduction (SCR) processes, leading to decreased performance and desirability of the aftertreatment systems.
Innovation Solution
A dosing module with a removable dosing tray and rail assembly that allows for individual control and metering of air and reductant, minimizing leakage and enabling easy replacement, thus maintaining system operation and flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dosing module is used to introduce liquid reductant into the exhaust gas flow, then NOx emissions are reduced through the SCR process, but deposits accumulate in the exhaust pipe over time decreasing SCR efficiency
Solution Approach 1:
The dosing module is divided into separate functional components including a removable dosing tray, manifold, and rail assembly. This segmentation allows the dosing tray to be independently removed and replaced, enabling maintenance without shutting down the entire SCR system and thus maintaining reliability while managing deposit accumulation issues.
Solution Approach 2:
The dosing tray is designed with movable and removable features, allowing it to be dynamically adjusted or replaced during operation. The rail assembly enables smooth insertion and removal of the dosing tray, facilitating quick maintenance operations that minimize system downtime and maintain continuous SCR efficiency.
2Ease of operation
If the dosing module uses a fixed manifold design, then the structure is simpler, but the entire system must be non-operational for any maintenance or component replacement
Solution Approach 1:
The dosing module is segmented into a fixed portion (manifold, frame assembly) and a removable portion (dosing tray). This allows the dosing tray to be independently accessed and replaced while the rest of the system remains operational, significantly reducing maintenance downtime and improving ease of operation.
Solution Approach 2:
The dosing tray is designed as a pre-assembled unit that can be prepared for replacement in advance. The rail assembly is configured to facilitate quick insertion and removal, allowing maintenance personnel to rapidly swap out the dosing tray without complex disassembly procedures, thereby minimizing system downtime.
3Reliability
If the dosing tray is permanently attached to the manifold, then the connection is more reliable, but the dosing tray cannot be easily removed for maintenance or replacement
Solution Approach 1:
The connection between the dosing tray and manifold is designed to be dynamically changeable - securely connected during operation for reliable sealing and fluid transfer, but easily disconnectable for maintenance. The rail assembly and connector design enable this dynamic transition between locked and unlocked states, facilitating both operational reliability and ease of repair.
Solution Approach 2:
A connector interface acts as an intermediary between the dosing tray and manifold, providing a reliable sealed connection during operation while enabling easy disconnection for maintenance. This intermediary component allows the system to switch between requiring high connection reliability and requiring ease of repair, depending on the operational phase.
4Productivity
If the dosing module uses a removable dosing tray design, then maintenance can be performed without shutting down the entire system, but the connector design becomes more complex
Solution Approach 1:
The connector system is segmented into separate components - a fixed connector on the manifold and a removable connector on the dosing tray. This segmentation allows the complex connector design to be isolated to the removable dosing tray assembly, enabling quick connection and disconnection operations that maintain high system availability while containing the complexity to a manageable, replaceable unit.
Data Source
AI summary
A dosing module includes a frame assembly, a first manifold, a first dosing tray, and a first rail assembly. The frame assembly includes a plurality of panels. The first manifold is coupled to one of the plurality of panels. The first manifold is configured to separately receive air and reductant. The first manifold includes a first connector extending from the first manifold. The first dosing tray includes a first base panel, a second manifold, and a second connector. The second manifold is coupled to the first base panel. The second manifold is configured to separately receive air and reductant from the first manifold and to provide the air and the reductant back to the first manifold. The second connector extends from the second manifold. The second connector is configured to be selectively coupled to the first connector. The first rail assembly includes a first member and a second member.