Venturi Pump Hydraulic Circuit for SCR Reagent Delivery
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Solution Overview
Problem
Current Selective Catalytic Reduction (SCR) systems require large, heavy, and costly pumps to deliver high-pressure liquid reagents, increasing size, weight, and energy consumption, which is inefficient for achieving stringent emissions standards.
Innovation Solution
A hydraulic circuit incorporating a venturi pump that uses a portion of the high-pressure liquid flow produced by a primary pump as a working fluid to generate a second, higher-flow-rate, lower-pressure liquid flow, eliminating the need for a second powered pump unit and enhancing reagent delivery and cooling capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If large pumps are used to deliver high-pressure liquid reagents, then reagent delivery pressure and volume requirements are met, but system size, weight, and energy requirements increase
Solution Approach 1:
The liquid flow from the pump is divided into two separate flows: a first flow directed to the injection valve for high-pressure reagent delivery, and a second flow directed to the cooling feature for cooling purposes. This segmentation allows the single pump to satisfy multiple requirements without needing additional pumping components, thereby reducing system weight while maintaining the required delivery pressure.
Solution Approach 2:
The single pump is designed to provide liquid flow that serves multiple functions simultaneously: it supplies high-pressure reagent to the injection valve and provides cooling liquid to the cooling feature. This multi-functionality eliminates the need for separate pumps for each function, reducing overall system weight and complexity while meeting both pressure and cooling requirements.
2Quantity of substance
If large pumps are used to deliver high-pressure liquid reagents, then reagent delivery volume requirements are met, but system size and cost increase
Solution Approach 1:
The liquid flow is segmented into two functional streams within the system: one stream delivers reagent to the injection valve while the other provides cooling to the cooling feature. This internal segmentation allows a single pump to achieve both high-volume reagent delivery and cooling functions without requiring multiple pump units, thereby reducing device complexity and system size.
Solution Approach 2:
The pump system is designed with universal functionality to simultaneously satisfy reagent delivery volume requirements and cooling liquid supply requirements. By making the single pump serve multiple purposes, the system avoids the complexity and size increase that would result from adding separate pumping components for each function.
3Temperature
If high-pressure liquid flow is used for cooling, then cooling capability is enhanced, but reagent decomposition may occur
Solution Approach 1:
The liquid flow is divided into separate pathways: high-pressure liquid is directed to the injection valve for reagent delivery, while a separate cooling flow is directed to the cooling feature. This segmentation ensures that the cooling function operates at appropriate pressures that provide adequate cooling capability without exposing the reagent to conditions that would cause decomposition.
Solution Approach 2:
The cooling feature acts as an intermediary component that receives liquid flow separately from the high-pressure reagent path. This intermediary arrangement allows cooling to be provided through a dedicated flow path that does not subject the reagent to decomposing conditions, while still achieving enhanced cooling capability through the dedicated cooling circuit.
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 configuration reduces the weight, cost, and energy requirements of SCR systems while improving reagent delivery efficiency and preventing reagent decomposition, allowing for larger reagent reservoirs and extended operation times.
Implementation Method 1
a venturi pump to produce a second flow of liquid using a portion of the first flow of liquid as a working fluid
Data Source
AI summary
A hydraulic circuit includes a pump in fluid communication with a reservoir containing a liquid to be pumped. The pump includes an inlet and an outlet. The hydraulic circuit also includes a venturi pump in fluid communication with the reservoir and with the outlet of the pump, and an injection valve including a cooling feature. The injection valve is in fluid communication with the outlet of the pump, and is configured to dispense liquid supplied to the injection valve by the pump. The cooling feature is in fluid communication with the venturi pump. The pump is configured to produce a first flow of liquid, and the hydraulic circuit is configured to supply a first portion of the first flow of liquid to the injection valve for dispensing by the injection valve and a second portion of the first flow of liquid to the venturi pump.