Modular NOx Reduction System with Dynamic Control
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Solution Overview
Problem
Existing NOx reduction systems for internal combustion engines are inefficient when used across different vehicle types and engine conditions, as they are optimized for specific engines and gas flow rates, leading to suboptimal performance, increased weight, and maintenance challenges, especially in non-road diesel engines used in construction sites.
Innovation Solution
A modular system that includes a gas inlet unit, a catalytic chamber with a selective catalytic reduction (SCR) catalyst, a heating means to maintain a temperature of at least 200°C, a flow inducing means to control gas flow rate, and sensors to adjust reductant injection based on NOx concentration and flow rate, allowing for flexible operation across varying engine conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a reduction catalyst system is designed and optimized for a specific engine type and gas flow rate, then the NOx reduction performance is improved for that specific application, but the system becomes inefficient and unsuitable for use with different vehicle types and engine conditions
Solution Approach 1:
The system is designed as a universal NOx reduction装置 that can be applied to multiple types of internal combustion engines (diesel, gasoline, natural gas) and various vehicle types (cars, trucks, construction vehicles, ships, power plants). The modular design with adjustable components allows the same system to adapt to different engine configurations and operating conditions while maintaining effective NOx reduction performance across all applications.
Solution Approach 2:
The system incorporates dynamic control mechanisms including variable reductant injection rates, adjustable gas flow rate control, and temperature regulation capabilities. These dynamic features allow the system to optimize its performance in real-time based on the specific engine type, load conditions, and exhaust gas characteristics, thereby maintaining high NOx reduction efficiency across diverse applications rather than being fixed for a single engine type.
2Reliability
If individually optimized NOx reduction systems are built into each vehicle, then the NOx reduction efficiency is maximized for that specific vehicle, but the vehicle weight increases and maintenance becomes more complex
Solution Approach 1:
The NOx reduction system is divided into modular components including the catalytic converter unit, reductant storage and injection system, temperature control elements, and sensors. This segmentation allows for a compact design that reduces overall system weight while maintaining effectiveness. The modular structure also simplifies installation and maintenance, as components can be independently serviced or replaced without requiring complete system removal.
3Object-generated harmful factors
If fuel injections or engine modifications are used to reduce NOx concentrations in exhaust gas, then the NOx emission is reduced, but the engine performance is compromised
Solution Approach 1:
The system introduces an intermediary substance (reductant such as ammonia or urea) that chemically reacts with NOx in the exhaust gas to convert it into nitrogen and water vapor. This intermediary approach allows NOx reduction to occur after combustion is complete, thereby eliminating the need to modify fuel injection timing or engine operating parameters, thus preserving engine performance while achieving effective NOx emission control.
4Reliability
If the reduction catalyst operates under constant gas flow and temperature conditions, then the NOx reduction performance is optimized, but the system cannot effectively handle engines operating under different loads with varying exhaust flow rates and temperatures
Solution Approach 1:
The system incorporates dynamic control mechanisms including variable reductant injection rates, adjustable gas flow rate control, and temperature regulation capabilities. These dynamic features allow the system to optimize its performance in real-time based on the specific engine type, load conditions, and exhaust gas characteristics, thereby maintaining high NOx reduction efficiency across diverse applications rather than being fixed for a single operating condition.
Solution Approach 2:
The system utilizes sensors to monitor exhaust gas temperature, flow rate, and NOx concentration in real-time. This feedback information is fed back to the control system, which automatically adjusts reductant injection rates and other operational parameters to maintain optimal NOx reduction performance across varying engine loads and operating conditions, ensuring the system adapts dynamically rather than operating under fixed conditions.
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 system effectively reduces NOx emissions independently of engine activity and temperature, minimizing back pressure and excess reductant emission, and can be easily adapted for use on multiple machines or vehicles, improving efficiency and reducing environmental impact.
Implementation Method 1
at least one heating means upstream of the reduction catalyst adapted to provide heating of at least a portion of the gas flow to achieve a temperature of the gas flow of at least 200 °C
Implementation Method 2
a first catalytic chamber, configured to receive the gas flow, wherein the first catalytic chamber comprises a reduction catalyst and is adapted for contacting the gas flow with the reduction catalyst
Implementation Method 3
a selective catalytic reduction (SCR) catalyst to reduce the NOx
Implementation Method 4
a flow inducing means adapted to draw the gas flow through the system
Data Source
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AI summary
A system and method for lowering NOx concentration in a gas flow comprising a gas inlet unit adapted for introducing a primary gas flow to form at least a portion of the gas flow; a first catalytic chamber, configured to receive the gas flow, comprising a reduction catalyst; a control means adapted to control the amount of a reductant that is introduced into the system or into the gas flow for exposure to the reduction catalyst; at least one heating means upstream of the reduction catalyst for heating at least a portion of the gas flow; a flow inducing means adapted to draw the gas flow through the system; a flow sensor adapted to measure flow rate of at least a portion of the gas flow; and a NOx sensor adapted to measure concentration of NOx in the measured gas flow, wherein the system is adapted to control the amount of reductant that is introduced by the control means based on the measured NOx concentration and gas flow rate.