Nested Fired Heat Exchanger Layout for Fluid Flow Control
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Solution Overview
Problem
Existing heat exchanger designs in industrial central heating systems lack control over fluid flow rate and are inefficient in terms of material usage, leading to larger-than-necessary exchanger dimensions.
Innovation Solution
A fired heat exchanger design featuring a cylindrical external and internal jacket with a misaligned combustion chamber, a sealed chamber for heated fluid flow, and flow direction control baffles, along with a tube array connected to the exhaust outlet for enhanced heat exchange, allowing for adjustable fluid flow and reduced size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional heat exchanger designs are used, then the structure is simple, but the fluid flow rate cannot be controlled and the dimensions are larger than necessary
Solution Approach 1:
The patent implements a variable cross-sectional area design in the heated fluid flow chamber, allowing the flow characteristics to be dynamically optimized. The misaligned combustion chamber and strategically positioned baffles create a dynamic flow path that enables control over fluid flow rate while maintaining a relatively simple overall structure.
Solution Approach 2:
The patent introduces a third dimension of control by misaligning the combustion chamber relative to the heated fluid flow chamber and using vertical baffles. This spatial arrangement creates multiple flow paths and control zones, enabling fluid flow rate control without significantly increasing structural complexity.
2Loss of substance
If traditional heat exchanger designs are used, then the design is conventional, but material usage is inefficient and exchanger dimensions are larger
Solution Approach 1:
The patent employs a nested configuration where the internal jacket with the combustion chamber is positioned within the external jacket containing the heated fluid flow chamber. This nesting arrangement maximizes heat exchange surface area within a compact volume, reducing material usage while achieving efficient heat transfer.
Solution Approach 2:
The patent optimizes the geometric parameters of the heat exchanger, including the misalignment distance between combustion and heated fluid chambers, the cross-sectional area ratios, and baffle positions. These parameter optimizations enable material savings by minimizing the exchanger dimensions while maintaining effective heat exchange.
3Volume of moving object
If the combustion chamber is misaligned with the heated fluid flow chamber, then the size is reduced, but the flow control becomes more complex
Solution Approach 1:
The patent divides the internal heated fluid flow chamber into multiple sections using baffles, creating distinct flow zones. This segmentation allows for simplified control of fluid flow in each zone while the overall misaligned configuration maintains compact dimensions. The baffles create a stepwise flow path that is easier to control than a fully integrated complex design.
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 enables precise control of fluid flow rate and material savings by optimizing the heat exchange area, resulting in a more compact and efficient heat exchanger.
Implementation Method 1
a tube array connected to the heated fluid flow chamber is located inside the exhaust outlet hole
Implementation Method 2
there is a common inlet for introducing a burner to the combustion chamber located inside the internal jacket
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
Fired heat exchanger comprising an external jacket (2) in a cylindrical shape, closed on one end with a bottom (9) and on the other with a bottom (10) fitted with a hole. The external jacket (2) houses an internal jacket (1) also of a cylindrical shape, closed on one end like the external jacket (2) with a bottom (11) and on the other with a bottom (12) fitted with a hole. Between the holes in the bottoms (10, 12), a common passage (5) is formed to introduce a burner into the combustion chamber (13) located inside the internal jacket (1). A common outlet hole (14) for exhaust is made in the side wall of the internal jacket (1) and the side wall of the external jacket (2). A sealed heated fluid flow chamber (4) is formed between the internal jacket (1) and external jacket (2). The chamber (4) is equipped with an inlet and outlet stub pipe for fluid.