Combustion Gas Cooling Duct With Tapered Cross-Section
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Solution Overview
Problem
Existing combustion gas cooling apparatuses fail to achieve sufficient cooling and uniform temperature distribution of combustion gases before they enter the catalyst part in denitration apparatuses, leading to performance degradation and pressure loss.
Innovation Solution
A combustion gas cooling apparatus with a first duct for introducing combustion gas and a second duct for mixing with a cooling gas, where the dimensions of the flow inlets and outlets are optimized to minimize flow separation and maldistribution, ensuring uniform mixing and reduced pressure loss, with the cross-sectional area of the second duct's outlet being sufficiently large to reduce gas flow rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a cooling medium is mixed with a combustion gas to cool it, then the cooling effect is enhanced, but the temperature distribution of the mixed gas becomes non-uniform
Solution Approach 1:
The cooling gas introduction is divided into multiple segments along the flow direction. Multiple cooling gas introduction ports are provided at different positions in the width direction, and cooling gas is introduced at multiple locations rather than a single point, creating multiple mixing zones that progressively homogenize the temperature distribution
Solution Approach 2:
The patent introduces cooling gas not only in the flow direction but also in the width direction perpendicular to the main flow. This multi-dimensional introduction approach ensures that cooling gas is distributed across the entire cross-section of the combustion gas, preventing localized cold spots and achieving uniform temperature distribution
2Stability of the object's composition
If the duct dimensions are optimized for uniform mixing, then the temperature distribution improves, but the pressure loss increases
Solution Approach 1:
The duct cross-sectional dimensions are designed to vary dynamically along the flow direction. The width and height of the duct are larger at the inlet and gradually decrease toward the outlet, creating a tapered configuration that maintains optimal mixing conditions in the upstream region while reducing flow resistance in the downstream region
Solution Approach 2:
The patent changes the geometric parameters of the duct (width, height, cross-sectional area) along the flow direction to optimize both mixing and pressure loss. By adjusting these dimensional parameters, the system achieves uniform temperature distribution in the mixing zone while minimizing pressure drop in the transport zone
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 apparatus effectively cools the combustion gas to a uniform temperature distribution, reducing pressure loss and enhancing the efficiency of nitrogen oxide decomposition in the catalyst part.
Implementation Method 1
a cooling duct which introduces a cooling gas to the first duct at a temperature lower than the combustion gas, and generates a mixed gas in which the combustion gas and the cooling gas are mixed
Data Source
AI summary
A fuel gas cooling apparatus includes a cooling duct which causes a cooling gas to flow out into a mixing duct, and a difference of maximum dimensions in a height direction of a flow inlet and a flow outlet with respect to a passage length of the mixing duct is smaller than a difference of maximum dimensions in the height direction of a flow inlet and a flow outlet with respect to a passage length of an expanded duct, or a difference of maximum dimensions in a width direction of the flow inlet and the flow outlet with respect to the passage length of the mixing duct is smaller than a difference of maximum dimensions in the width direction of the flow inlet and the flow outlet with respect to the passage length of the expanded duct.