Burner and gas water heater provided with same
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Solution Overview
Problem
Existing gas water heaters emit high levels of nitrogen oxides due to inefficient combustion processes, contributing to environmental pollution.
Innovation Solution
A combustor design featuring a dual combustion cavity system with rich and lean combustion zones, along with a rectifying device, to stabilize the flame structure and reduce nitrogen oxide emissions by optimizing air-fuel mixture ratios and flame temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional combustion is used in gas water heaters, then combustion efficiency is maintained, but nitrogen oxide emissions increase causing environmental pollution
Solution Approach 1:
The combustion process is segmented into multiple zones with different air-fuel ratios. The combustor divides the combustion chamber into a first combustion zone with a first air-fuel ratio and a second combustion zone with a second air-fuel ratio, allowing different combustion characteristics in different regions to simultaneously achieve efficiency and low emissions
Solution Approach 2:
Different regions of the combustion chamber are given different local combustion characteristics. The first combustion zone has optimized air-fuel mixing for efficiency, while the second combustion zone has different air-fuel ratio characteristics that reduce nitrogen oxide formation, with each zone having tailored flow structures and injection patterns
2Object-affected harmful factors
If air-fuel mixture ratio is optimized to reduce nitrogen oxide emissions, then environmental pollution decreases, but flame stability may be compromised
Solution Approach 1:
The combustion system is divided into multiple zones, each with optimized air-fuel ratios for their specific function. The first combustion zone maintains stable combustion with one air-fuel ratio, while the second zone uses a different ratio to control emissions, allowing both stability and emission control to be achieved simultaneously in different regions
Solution Approach 2:
A flow guiding structure acts as an intermediary between the fuel injection and the combustion zones. This structure includes a first flow guiding portion and a second flow guiding portion that direct and condition the air-fuel mixture before it reaches different combustion zones, ensuring proper mixing and stable flame attachment while controlling the air-fuel ratio distribution
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 combustor design improves flame stability and reduces nitrogen oxide emissions, enhancing environmental sustainability by minimizing harmful pollutants from gas water heaters.
Implementation Method 1
a first rich combustion cavity, a second rich combustion cavity and a lean combustion cavity therein
Implementation Method 2
achieving a good mixture proportion of the air introduced by the rich combustion injection port to the fuel gas and a good mixture proportion of the air introduced by the lean combustion injection port to the fuel gas
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A combustor and a gas water heater having the same are provided, wherein the combustor includes at least one combustion unit (1) comprising a combustor shell (11) and a rectifying device (14), the combustor shell (11) is provided with a rich combustion injection port (131), a lean combustion injection port (121), a first rich combustion flame port (118), a second rich combustion flame port (119) and a lean combustion opening (115), wherein a sectional area S1 of the rich combustion injection port (131) and a sectional area S2 of the lean combustion injection port (121) satisfy: S1/S2=0.20∼0.40.