Combustion Gas Cooling Duct with Segmented Outlets
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Solution Overview
Problem
Existing combustion gas cooling apparatuses fail to achieve sufficient cooling and uniform temperature distribution for gases supplied to catalyst parts in denitration systems, leading to performance degradation and potential failure, and they do not adequately protect cooling ducts from heat-induced deformation or breakage.
Innovation Solution
A combustion gas cooling apparatus with a cooling duct system that distributes a cooling gas through multiple outlets to uniformly mix with combustion gas, ensuring efficient cooling and protecting the ducts with a thermal insulating space to prevent heat damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a cooling medium is mixed with combustion gas to cool it, then the cooling effect is enhanced, but the temperature distribution uniformity deteriorates
Solution Approach 1:
The cooling gas flow outlet is divided into multiple outlets arranged in different directions. Instead of a single outlet, the system uses multiple segmented outlets (first cooling gas flow outlets and second cooling gas flow outlets) that discharge cooling gas in different directions to achieve more uniform temperature distribution throughout the combustion gas
Solution Approach 2:
Different parts of the cooling gas outlet structure have different orientations and functions. The first cooling gas flow outlets are arranged in a first direction while the second cooling gas flow outlets are arranged in a second direction different from the first, creating local variations in cooling gas discharge patterns to achieve overall uniform temperature distribution
2Temperature
If a cooling duct is disposed in a combustion gas flow duct, then cooling can be achieved, but the cooling duct is vulnerable to heat-induced deformation or breakage
Solution Approach 1:
A protective coating is applied to the outer surface of the cooling duct to act as an intermediary layer between the high-temperature combustion gas and the cooling duct material. This coating serves as a thermal barrier that protects the cooling duct from direct heat exposure, preventing deformation and breakage while allowing the cooling function to continue
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 range suitable for catalyst activity, preventing performance degradation and ensuring the structural integrity of the cooling ducts.
Implementation Method 1
a cooling gas flow outlet through which the cooling gas having flowed into the cooling gas flow inlet flows out into the first duct to form a mixed gas in which the combustion gas and the cooling gas are mixed
Data Source
AI summary
A combustion gas cooling apparatus includes a cooling duct from which a cooling gas at a temperature lower than the temperature of a combustion gas flows out into a mixing duct to form a mixed gas in which the combustion gas and the cooling gas are mixed. The cooling duct has cooling gas flow inlets into which the cooling gas flows, a plurality of cooling gas outflow apertures through which the cooling gas having flowed into the cooling gas flow inlets flows out into the mixing duct, and distribution passages through which the cooling gas having flowed into the cooling gas flow inlets is distributed to the plurality of cooling gas outflow apertures.