Coaxial Multi-Stage Gasification Burner Design
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Solution Overview
Problem
Existing coal gasification technologies face issues with inadequate mixing of fuels and oxidants in limited reaction spaces, leading to local overheating, ablation, and low fuel conversion rates, which affect the safety, stability, and economy of gasification plants.
Innovation Solution
A gasification burner design featuring a main burner with N-stage sub-burners arranged coaxially, each with independent fuel and oxidant channels, and a swirl structure to enhance mixing, along with coolant jackets for ablation resistance, allowing for flexible operation and adjustment of the flame shape.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a one-way fuel channel structure is used, then the device complexity is reduced, but the contact area between fuels and oxidants is small, resulting in insufficient mixing and low fuel conversion rate
Solution Approach 1:
The burner is divided into multiple independent stages (first stage burner, second stage burner, third stage burner) with separate fuel channels and oxidant channels for each stage. This segmentation increases the total contact area between fuels and oxidants while maintaining manageable structural complexity through modular design.
Solution Approach 2:
The burners are arranged in a coaxial nested configuration where the first, second, and third stage burners are positioned concentrically within each other. This nesting approach maximizes the contact area between fuels and oxidants in the limited reaction space while maintaining a compact overall structure.
2Volume of moving object
If the reaction space is reduced, then the equipment size is reduced, but the blending degree of fuels and oxidants deteriorates due to insufficient mixing time
Solution Approach 1:
By dividing the burner into multiple stages with independent fuel and oxidant channels, the invention creates multiple mixing zones within the limited reaction space. Each stage contributes to progressive mixing, ensuring uniform blending of fuels and oxidants despite the compact volume.
Solution Approach 2:
The coaxial nested arrangement utilizes the radial dimension to create multiple concentric mixing zones. This three-dimensional configuration allows充分 mixing within a compact volume by exploiting the radial space between nested burners for fuel-oxidant contact and blending.
3Temperature
If the operation load is reduced to alleviate local overheating, then the temperature and pressure of gasifier are reduced, but the fuel conversion rate decreases
Solution Approach 1:
The multi-stage burner structure allows independent control of each stage's fuel and oxidant flow. This enables precise adjustment of the flame shape and heat distribution pattern, allowing the system to operate at high loads while preventing local overheating through optimized thermal management across the different stages.
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 ensures uniform and sufficient mixing of fuels and oxidants, increasing the combustion reaction rate and fuel conversion rate, while preventing overheating and extending the burner's service life, allowing for flexible operation to meet different production requirements.
Implementation Method 1
a swirl structure to enhance mixing
Implementation Method 2
coolant jackets for ablation resistance
Implementation Method 3
increasing the combustion reaction rate
Data Source
AI summary
The present invention relates to a gasification burner comprising a main burner, N-stage sub-burners arranged on the inner side of the main burner, where N is an integer greater than or equal to 1, the main burner and each stage of the sub-burners have independent fuel channels and oxidant channels respectively, the main burner and each stage of the sub-burners are arranged in a coaxial sleeves from outside to inside; the inner diameter of the main burner is larger than the outer diameter of the first stage of the sub-burners, and the inner diameter of each stage of the sub-burners is larger than the outer diameter of its next stage of the sub-burners; the gasification burner can ensure fuels and oxidants to be mixed fully and evenly in limited reaction space and residence time, accelerate combustion reaction rate, thereby improving fuel conversion rate and gasification performance; meanwhile, it can flexibly adjust flame shape without reducing the load of gasifier furnace by adjusting the load of the main burner and each stage of the sub-burners, thereby effectively avoiding overheating of the gasifier furnace to meet different production load requirements of project sites.