Fire Grate with Flame Stabilizer to Reduce Nitrogen Oxide Emission
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Solution Overview
Problem
Existing gas water heaters produce high nitrogen oxides due to high combustion intensity at the fire grate, leading to poor smoke gas emission performance.
Innovation Solution
A fire grate design incorporating a flame stabilizer with auxiliary gas channels and a combustion panel, which reduces combustion intensity by shunting gas flow and increasing the fire hole area, improving smoke emission and lowering nitrogen oxide generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If combustion intensity at the fire hole position is increased, then heating efficiency is improved, but nitrogen oxide emission increases
Solution Approach 1:
The fire grate is divided into multiple fire holes, and the gas flow is segmented through auxiliary gas channels that distribute combustion gas to different locations. This segmentation reduces the combustion intensity at each individual fire hole while maintaining overall heating efficiency, thereby reducing nitrogen oxide emissions.
Solution Approach 2:
Auxiliary gas channels are introduced as intermediary structures between the main gas channel and the fire holes. These channels redirect and distribute the combustion gas flow, acting as a mediator to reduce the direct high-intensity combustion at fire holes while still providing sufficient heat for water heating.
2Productivity
If combustion intensity is increased, then hot water production efficiency is improved, but smoke gas emission performance deteriorates
Solution Approach 1:
The combustion process is segmented into multiple zones through the auxiliary gas channels and fire holes. This distributes the combustion load, reducing peak combustion intensity and improving smoke gas emission performance while maintaining overall hot water production efficiency through increased effective fire hole area.
Solution Approach 2:
The gas flow distribution is extended into a third dimension by introducing auxiliary gas channels that branch off from the main gas channel. This spatial dimensionality change allows gas to be distributed to multiple fire holes simultaneously, reducing concentrated combustion intensity while maintaining productivity.
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 design enhances smoke emission performance and reduces nitrogen oxide production during combustion by lowering combustion intensity and ensuring complete gas flow combustion.
Implementation Method 1
reduces combustion intensity by shunting gas flow
Implementation Method 2
combusts a mixture of air and fuel gas within a combustion chamber through a burner to generate high-temperature flue gas
Data Source
AI summary
A fire grate includes a fire grate body and a flame stabilizer. The fire grate body has a main gas channel formed therein. A main gas outlet is formed at a top of the fire grate body and in communication with the main gas channel, and a communication opening is formed at a side of the fire grate body and in communication with the main gas channel. The flame stabilizer is disposed outside the fire grate body and forms an auxiliary gas channel together with the fire grate body. The auxiliary gas channel is in communication with the communication opening. The flame stabilizer also has an auxiliary gas outlet formed at a top of the flame stabilizer and in communication with the auxiliary gas channel.