Emission Reduction Pump Ambient Air Purging Control
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Solution Overview
Problem
Existing emission reduction systems rely on compressed air for purging, which depletes the compressed air source and increases costs, especially in cold environments where reductant retention can lead to freezing issues affecting system performance.
Innovation Solution
The emission reduction system incorporates a pump that can draw in ambient air for purging, with a control assembly managing the use of either ambient or compressed air based on air source pressure and volume, allowing selective purging modes to optimize air usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If compressed air source is used for purging operations, then purging effectiveness is improved, but compressed air depletion occurs and system cost increases
Solution Approach 1:
The pump is designed to perform multiple functions: delivering reductant during normal operation and performing purging operations when activated. By making the pump multi-functional, the system can use the same component for both reductant delivery and purging, eliminating the need for dedicated compressed air usage and reducing compressed air consumption while maintaining purging effectiveness
Solution Approach 2:
The system uses its own pump to perform purging operations by drawing ambient air through the pump, rather than relying on an external compressed air source. This self-service approach allows the pump to clear residual reductant from the system using ambient air, reducing dependency on compressed air supplies and associated costs
2Reliability
If high capacity compressed air source is associated with reductant delivery system, then purging capability is improved, but overall system cost increases
Solution Approach 1:
The invention extracts the purging function from the compressed air system and transfers it to the pump system. By removing the dependency on compressed air for purging operations, the system eliminates the need for high-capacity compressed air sources, thereby reducing system complexity and cost while maintaining purging capability
Solution Approach 2:
The system uses ambient air, which is freely available and cost-effective, instead of expensive compressed air for purging operations. This substitution of a cheap resource (ambient air) for an expensive one (compressed air) reduces operational costs and system complexity without compromising purging effectiveness
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces the need for a high-capacity compressed air source, minimizing costs while effectively purging the system without depleting the air supply, thus maintaining system performance even in cold conditions.
Implementation Method 1
the pump is further configured to draw in air from an ambient air source. The emission reduction system further includes a control assembly disposed in fluid communication with the ambient air source and the pump. The control assembly is configured to selectively allow the pump to access the ambient air source for purging the pump.
Data Source
AI summary
An emission reduction system is provided. The emission reduction system includes a tank configured to store a reductant. The emission reduction system also includes a pump configured to draw the reductant from the tank and supply the reductant to an exhaust system. The pump is further configured to draw in air from an ambient air source. The emission reduction system further includes a control assembly disposed in fluid communication with the ambient air source and the pump. The control assembly is configured to selectively allow the pump to access the ambient air source for purging the pump.