Fire grate and manufacturing method thereof, burner and water heater
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Solution Overview
Problem
Existing burners in water heaters have a high nitrogen oxide content in flue gas due to insufficient combustion, leading to environmental pollution and failure to meet low nitrogen emission requirements.
Innovation Solution
A fire grate design featuring a ventilation channel with a large open area dividing hole and a metal mesh, combined with a flame stabilizing device, which increases the open area and provides a dual flame stabilizing effect, improving flue gas emission performance and reducing nitrogen oxide production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single strip-shaped fire port structure is used, then the structure is simple, but the burning intensity is high and nitrogen oxide content is high
Solution Approach 1:
The fire port is divided into multiple separate fire ports arranged in an array, with each fire port having a specific shape and size. This segmentation reduces the burning intensity of individual fire ports while maintaining overall combustion efficiency, thereby reducing nitrogen oxide emissions.
Solution Approach 2:
Different fire ports in the array have different shapes and sizes tailored to specific combustion requirements. This local differentiation allows optimization of combustion characteristics at each position, improving overall combustion completeness and reducing harmful emissions.
2Area of stationary object
If the fire port area is small, then the structure is compact, but the burning intensity is high resulting in poor flue gas emission performance
Solution Approach 1:
The total fire port area is distributed across multiple smaller fire ports arranged in an array. This segmentation maintains a compact overall structure while ensuring that each individual fire port has optimized dimensions for complete combustion, thereby improving flue gas emission performance.
Solution Approach 2:
Instead of increasing the area of a single fire port, the solution distributes combustion across multiple fire ports in a two-dimensional array configuration. This dimensional approach maintains structural compactness while achieving better combustion performance and lower emissions.
3Use of energy by moving object
If combustion is insufficient, then energy efficiency is low, but nitrogen oxide content in flue gas is high
Solution Approach 1:
The shape, size, and arrangement parameters of the fire ports are optimized to achieve complete combustion. By carefully selecting these parameters, the combustion efficiency is improved while nitrogen oxide emissions are reduced, as complete combustion minimizes the formation of thermal NOx.
Solution Approach 2:
The multiple fire ports are arranged to ensure continuous and uniform combustion across the burner surface. This continuous combustion action maintains stable flame temperatures and ensures complete fuel oxidation, reducing nitrogen oxide formation while maintaining energy efficiency.
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 flue gas emission performance, reduces nitrogen oxide generation, and increases the adaptability range of the combustion thermal load, allowing for a simpler structure, easier manufacturing, and lower costs while meeting low nitrogen emission requirements.
Implementation Method 1
a fire grate body, which is formed with a ventilation channel, a top portion of the fire grate body being provided with a dividing hole communicating with the ventilation channel
Implementation Method 2
a metal mesh, which is attached onto the fire grate body at a position corresponding to the dividing hole... improving flue gas emission performance and reducing nitrogen oxide production
Data Source
AI summary
A fire grate, a manufacturing method thereof, and a burner and a water heater applying the fire grate are provided. The fire grate has a fire grate body, a flame stabilizer and a metal mesh. The fire grate body forms a ventilation channel. A dividing hole in communication with the ventilation channel is provided at a top portion of the fire grate body. The flame stabilizer is provided at the upper portion of the fire grate body. A cavity with a top surface as an opening is formed within the flame stabilizer. A gap is formed between a sidewall of the cavity and a surface of the fire grate body. The gap is in communication with the ventilation channel. The metal mesh is attached onto the fire grate body at a position corresponding to the dividing hole.