Reagent Connector Heat Exchange for SCR Pump
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Solution Overview
Problem
Reagent dosing pumps in selective catalytic reduction systems face overheating issues due to high temperatures, leading to urea precipitation and inefficient NOx emission reduction, and existing connector solutions are bulky and difficult to integrate in compact spaces.
Innovation Solution
A pump assembly with a reagent connector featuring a heat exchange arrangement within the reagent passage and a flow guide to cool the reagent fluid, combined with a heat exchange block and jacket design that optimizes cooling fluid flow for efficient heat transfer, and a method of forming the pump assembly with overmoulding of metallic reagent inlet connectors and plastic jackets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the reagent dosing pump is located close to the exhaust pipe to reduce NOx emissions, then the pumping efficiency is improved, but the reagent temperature increases causing urea precipitation
Solution Approach 1:
The reagent delivery system is segmented into separate functional components: the dosing pump positioned for optimal pumping efficiency, and a dedicated heat exchange arrangement (cooling jacket) integrated into the reagent passage to independently manage temperature. This allows the pump to operate close to the exhaust pipe while the cooling system separately controls reagent temperature to prevent urea precipitation.
2Reliability
If cooling means are added to cool the reagent, then urea precipitation is prevented, but the device complexity increases
Solution Approach 1:
The cooling function is merged with the reagent passage structure itself. The heat exchange arrangement is integrated into the reagent delivery path, with cooling channels formed within or around the reagent passage. This combination eliminates the need for separate external cooling systems while preventing urea precipitation, thereby maintaining reliability without significantly increasing device complexity.
3Temperature
If a heat exchange arrangement is integrated into the reagent connector, then reagent cooling is improved, but the connector size increases
Solution Approach 1:
The heat exchange arrangement is nested within the reagent connector structure. Cooling channels are integrated into the connector body, with inner cooling passages surrounded by outer structural walls. This nesting approach allows the heat exchange functionality to be embedded within the existing connector volume, improving reagent cooling efficiency without significantly increasing the overall connector size.
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
The solution effectively prevents reagent overheating, maintains reagent concentration, and improves the integration of cooling systems within compact spaces, ensuring efficient NOx emission reduction and reliable pump operation.
Implementation Method 1
a heat exchange arrangement for cooling reagent fluid within at least a portion of the reagent passage
Implementation Method 2
The inner compartment is in fluid communication with the second compartment. The outer compartment is in fluid communication with the inner compartment and with the cavity of the jacket
Implementation Method 3
cooling fluid flow through the heat exchange arrangement
Data Source
Figure 1
Figure 2
Figure 3~5
AI summary
A pump assembly (100) for use in a selective catalytic reduction system, the pump assembly comprising: a pump housing (104); a jacket (130) including a cavity (132) for receiving the pump housing (104); first and second ports (232, 230) for cooling fluid; a reagent connector (166) comprising a reagent passage (306) for reagent fluid, the reagent connector being arranged to be in fluid communication with reagent inlet means (112) of the pump housing (104) wherein the pump assembly further comprises a heat exchange arrangement (304) for cooling reagent fluid within at least a portion (303) of the reagent passage (306).