Industrial Burner Radial Heat Exchange Insulation
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Solution Overview
Problem
Industrial burners with integrated heat exchange devices, such as recuperators or regenerators, face efficiency losses due to undesired heating of the heat exchange device by the combustion chamber, which reduces the cooling efficiency of exhaust gases and increases space requirements.
Innovation Solution
Incorporating thermal insulation with a wall thickness of at least 3 mm and a thermal conductivity of less than 5 W/(m·K) between the combustion chamber and the heat exchange device to minimize heat transfer from the combustion chamber, thereby maximizing the heat exchange surface and reducing thermal influence on the exhaust gas cooling process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the heat exchange device is extended axially along the combustion chamber to maximize heat exchange surface, then the heat exchange efficiency is improved, but the overall length of the burner increases and space requirements increase
Solution Approach 1:
The heat exchange device is arranged radially around the combustion chamber instead of extending axially, transforming the heat exchange surface from a linear axial extension to a radial three-dimensional arrangement. This allows maximum heat exchange surface area within a compact axial length, resolving the contradiction between heat exchange efficiency and burner length.
Solution Approach 2:
The heat exchange device is nested concentrically around the combustion chamber, with the combustion chamber positioned at the center and the heat exchange device surrounding it. This nested arrangement allows the heat exchange surface to be maximized within the radial space without increasing the axial length of the burner.
2Length of stationary object
If the heat exchange device is positioned close to the combustion chamber to reduce space requirements, then the burner compactness is improved, but the heat exchange device is undesirably heated by the combustion chamber reducing cooling efficiency
Solution Approach 1:
A thermally insulating component is introduced as an intermediary between the combustion chamber and the heat exchange device. This insulation layer blocks unwanted heat transfer from the combustion chamber to the heat exchange device, allowing the heat exchange device to remain compact while maintaining its cooling efficiency by preventing undesired heating.
3Productivity
If the burner diameter is reduced to minimize openings in the furnace wall, then the system efficiency is improved, but the space required for the heat exchange device is reduced
Solution Approach 1:
The heat exchange device is nested concentrically around the combustion chamber, utilizing the radial space within the burner structure. This allows the heat exchange device to be accommodated within a compact diameter, maintaining system efficiency while providing sufficient volume for effective heat exchange.
Solution Approach 2:
The heat exchange surface is arranged in a radial three-dimensional configuration around the combustion chamber rather than extending axially. This dimensional change allows maximum heat exchange surface area within a reduced diameter, resolving the contradiction between system efficiency and heat exchange device volume.
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
This design enhances the efficiency of the heat exchange process by preventing undesired heating of the heat exchange device, allowing for effective preheating of combustion air and cooling of exhaust gases, while reducing the overall length and space requirements of the burner.
Implementation Method 1
Incorporating thermal insulation with a wall thickness of at least 3 mm and a thermal conductivity of less than 5 W/(m·K) between the combustion chamber and the heat exchange device to minimize heat transfer from the combustion chamber
Implementation Method 2
at least one heat exchange device, which consists of the Boiler room in the heat exchange device funded exhaust gas cools by heat exchange with combustion air
Implementation Method 3
exhaust gas cools by heat exchange with combustion air
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
The industrial burner (10) has a combustion chamber (13) formed with an opening (17) through which the stream (16) from the combustion chamber flows into a heating chamber (12). A heat exchange device (31) cools the conveyed off-gas from the heating chamber by heat exchanging with combustion air (15). The heat insulation portion (24) is positioned between the combustion chamber and heat exchange device. The wall thickness of thermal insulation portion is 3 mm, and the thermal insulation portion is made vacuum-formed ceramic fiber having thermal conductivity of less than 5 W/mK.