Exhaust Denitrification Reactor with Wave-Shaped Filter
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Solution Overview
Problem
Conventional exhaust gas denitrifying systems require large silencers for noise reduction, leading to increased system size and decreased denitrification efficiency due to temperature and pressure drops, which also result in higher fuel consumption and reduced engine efficiency.
Innovation Solution
An exhaust gas denitrifying system with a noise-reduction structure that uses a single reactor with a catalytic filter unit having wave-shaped through-holes and partitions to maintain contact area and disperse exhaust gas flow, allowing for simultaneous denitrification and noise reduction, minimizing pressure drop and system size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a silencer is used for noise reduction, then noise is reduced, but the system size increases
Solution Approach 1:
The patent combines the silencer function with the reactor by forming a wave-shaped structure within the reactor body. The wave-shaped through-holes and partitions create acoustic resistance for noise reduction while maintaining the denitrification function, eliminating the need for a separate silencer component and reducing overall system size.
Solution Approach 2:
The reactor is designed to perform multiple functions: denitrification through the catalyst and noise reduction through the wave-shaped structure. The wave-shaped through-holes and partitions serve dual purposes of maintaining gas flow while creating acoustic resistance, making the reactor a multi-functional component.
2Object-affected harmful factors
If a silencer is used for noise reduction, then noise is reduced, but temperature and pressure of exhaust gas decrease
Solution Approach 1:
By integrating the noise reduction structure directly into the reactor path, the exhaust gas undergoes denitrification before noise reduction. This eliminates the sequential process where the silencer would cool the gas, maintaining higher temperature throughout the system while still achieving noise reduction through the wave-shaped structure.
3Object-affected harmful factors
If a silencer is used for noise reduction, then noise is reduced, but pressure of exhaust gas drops greatly
Solution Approach 1:
The wave-shaped structure within the reactor creates acoustic resistance for noise reduction without the significant pressure drop associated with conventional silencers. The partitions and wave-shaped through-holes are designed to minimize flow resistance while creating acoustic damping effects.
4Object-affected harmful factors
If exhaust gas passes through silencer before denitrification, then noise is reduced, but denitrification efficiency is lowered
Solution Approach 1:
The patent inverts the conventional sequence by performing denitrification first through the catalyst in the reactor, then noise reduction through the wave-shaped structure. This reversal ensures that exhaust gas maintains high temperature and pressure for efficient denitrification before noise reduction, achieving both high efficiency and noise control.
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 enhances noise reduction while maintaining denitrification efficiency, reduces system size, and minimizes fuel consumption by denitrifying high-temperature, high-pressure exhaust gas before noise reduction, improving engine efficiency.
Implementation Method 1
a reactor in which a chemical reaction of converting nitrogen oxides included in exhaust gas into nitrogen by nitrifying the nitrogen oxides using a catalyst takes place
Implementation Method 2
side walls forming through-holes of a catalytic filter unit are formed in a wave shape, so that the space of the through-holes can be enlarged while maintaining the contact area between exhaust gas and a catalyst, thereby increasing a noise-reducing effect
Implementation Method 3
a plurality of partitions are disposed at the rear side of the catalytic filter unit in the reactor at regular intervals in a direction parallel to the flow of exhaust gas, so that the flow of the exhaust gas denitrified by the catalytic filter unit can be dispersed and the noise of the exhaust gas can be reduced
Data Source
AI summary
An exhaust gas denitrifying system having a noise-reduction structure includes a reactor in which a chemical reaction that converts nitrogen oxides included in exhaust gas into nitrogen by denitrifying the nitrogen oxides using a catalyst takes place. The reactor includes a catalytic filter unit coated with a catalyst and provided with a plurality of through-holes through which exhaust gas passes; and a noise-reducing unit for removing noise from the exhaust gas denitrified by the catalytic filter unit. The reactor denitrifies the nitrogen oxides, and simultaneously reduces the noise, thus reducing the size of the exhaust gas denitrifying system.