Shell-and-Tube Heat Exchanger Insulation Space Against Boiling
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Solution Overview
Problem
Shell and tube heat exchangers experience inefficient heat exchange and violent disruptive boiling when the tube side stream is near its boiling point, leading to non-uniform distribution and loss of the tube side stream due to vapor formation, increasing operational costs.
Innovation Solution
Inserting an insulation tube sheet between the distributor assembly and the shell side outlet creates an inlet insulation space, preventing overheating of the tube side stream and reducing the shell side stream required for heat exchange, thus ensuring uniform distribution and minimizing losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the shell side stream is used to heat the tube side stream near its boiling point, then heat exchange efficiency is improved, but violent disruptive boiling occurs causing non-uniform distribution and stream loss
Solution Approach 1:
The shell side outlet is divided into multiple outlet ports that are spatially separated and oriented in different directions. This segmentation prevents the concentrated thermal impact that causes violent boiling, allowing the shell side stream to heat the tube side stream more gradually and uniformly across multiple exit points rather than a single concentrated outlet.
Solution Approach 2:
Different regions of the shell side outlet are designed with different properties - multiple outlet ports are positioned at different locations and angles to create localized heating zones. This ensures that heat is applied uniformly across the tube side stream cross-section rather than concentrated in one area, preventing disruptive boiling while maintaining effective heat exchange.
2Device complexity
If the shell side outlet is positioned close to the distributor assembly, then device complexity is reduced, but overheating of the tube side stream occurs causing vapor formation and stream loss
Solution Approach 1:
The outlet ports are oriented in different spatial directions (radial, axial, and tangential components) rather than a single direction. This dimensional distribution of the outlet ports allows the shell side stream to exit in multiple directions, reducing the intensity of heating at any single location near the distributor assembly and preventing vapor formation while maintaining compact device design.
Solution Approach 2:
The single shell side outlet is segmented into multiple outlet ports positioned at different locations and orientations. This segmentation distributes the thermal energy more evenly and prevents the concentrated overheating that would occur with a single outlet positioned close to the distributor assembly, thereby reducing tube side stream loss.
3Device complexity
If a single shell side outlet is used, then device complexity is reduced, but non-uniform heat exchange occurs leading to inefficient operation
Solution Approach 1:
The shell side outlet is segmented into multiple outlet ports positioned at different locations and orientations within the shell. This segmentation creates multiple heat exchange zones that work in parallel, improving overall heat exchange efficiency by ensuring uniform heat distribution across the tube side stream while maintaining relatively simple device construction.
Solution Approach 2:
The outlet ports are positioned asymmetrically at different locations and angles rather than symmetrically arranged. This asymmetric positioning optimizes the heat exchange pattern by directing the shell side stream to interact with the tube side stream in multiple different flow patterns, enhancing overall heat transfer efficiency while avoiding the complexity of symmetric multi-outlet configurations.
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 insulation space prevents violent boiling, ensures uniform distribution of the tube side stream, and reduces the shell side stream requirements, resulting in cost savings and an economically efficient heat exchange process.
Implementation Method 1
an insulation tube sheet arranged between the distributor assembly and the shell side outlet of a heat exchanger to create an insulation space between the distributor assembly and the insulating tube sheet
Data Source
AI summary
The presently claimed invention relates to a heat exchanger and a method of exchanging heat.