Exhaust Purification Control for Ammonia Adsorption Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing exhaust gas purification systems face the challenge of improving the purification rate while preventing ammonia desorption into the atmosphere when high temperatures cause ammonia to release from the catalyst.
Innovation Solution
A system comprising a catalyst, a motor, a battery, and a control device that adjusts urea injection based on battery capacity to maintain a steady engine load, thereby controlling ammonia adsorption and suppressing temperature fluctuations, ensuring efficient ammonia adsorption and reaction with nitrogen oxides.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a large amount of ammonia is adsorbed to the catalyst, then the exhaust gas purification rate is improved, but ammonia may desorb and be released into the atmosphere when exhaust gas temperature increases
Solution Approach 1:
The system dynamically adjusts the adsorption amount of ammonia on the catalyst based on real-time exhaust gas temperature conditions. The control device modifies operational parameters to optimize ammonia adsorption when temperatures are favorable while preventing excessive adsorption that would lead to desorption at higher temperatures, thereby dynamically balancing purification efficiency with emission control.
Solution Approach 2:
The control device continuously monitors exhaust gas temperature and adjusts the amount of ammonia adsorbed on the catalyst accordingly. When temperature increases are detected, the system provides feedback to reduce ammonia adsorption to prevent desorption and atmospheric release, creating a closed-loop control system that resolves the contradiction between purification rate and ammonia release prevention.
2Productivity
If the adsorption amount of ammonia on the catalyst is increased, then the reaction with nitrogen oxides is facilitated, but the risk of ammonia desorption increases when temperature rises
Solution Approach 1:
The system implements dynamic control of ammonia adsorption levels based on real-time temperature monitoring. The control device adjusts operational parameters to maintain optimal ammonia adsorption amounts that facilitate rapid reaction with nitrogen oxides while adapting to temperature changes to prevent desorption, thereby dynamically balancing reaction efficiency with adsorption stability.
Solution Approach 2:
The control device changes operational parameters such as the amount of ammonia adsorbed on the catalyst based on exhaust gas temperature conditions. By adjusting these parameters dynamically, the system optimizes the reaction rate between ammonia and nitrogen oxides while maintaining stable adsorption conditions that prevent ammonia desorption and release.
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 enhances exhaust gas purification rate by increasing ammonia adsorption on the catalyst while preventing ammonia release, achieving both improved purification and reduced atmospheric emissions.
Implementation Method 1
a catalyst that causes adsorbed ammonia to react with nitrogen oxide contained in exhaust gas
Implementation Method 2
a catalyst that causes adsorbed ammonia to react with nitrogen oxide contained in exhaust gas of the engine to purify the exhaust gas
Implementation Method 3
an injection controller that controls an amount of urea to be injected so that an adsorption amount of the ammonia adsorbed to the catalyst increases
Data Source
AI summary
[Solution] A purification system includes an engine, a catalyst that causes adsorbed ammonia to react with nitrogen oxide contained in exhaust gas of the engine to purify the exhaust gas, a motor that is driven to compensate for the difference between a) an engine load of the engine and b) a driving load, when the driving load of a driven device driven by the engine changes, a battery that supplies electricity to the motor, and a setting part that sets a target value so that the target value of the adsorption amount of the catalyst increases as the remaining capacity of the battery increases.