Shell and Tube Heat Exchanger Expansion Joint Thermal Stress
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional heat exchangers in olefin production systems face issues with thermal stress and pressure drop due to uneven thermal expansion, and they do not efficiently transfer heat from product streams to hydrocarbon feedstocks.
Innovation Solution
The implementation of a shell and tube heat exchanger with features such as expansion joints, refractory materials, and enhanced surface area tubes to manage thermal stress and improve heat transfer efficiency, along with a gas/solids separation system for regenerating particulate solids and preheating hydrocarbon feed streams.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional heat exchangers are used to transfer heat from product stream to hydrocarbon feedstock, then heat transfer function is provided, but significant thermal stress occurs due to uneven thermal expansion of components
Solution Approach 1:
The patent applies thermal expansion principles by incorporating expansion joints in the heat exchanger design. These expansion joints allow different components of the heat exchanger to expand at different rates when exposed to temperature changes, thereby reducing thermal stress. The expansion joints are specifically positioned to accommodate differential expansion between the shell and tube components, preventing stress concentration and potential failure.
Solution Approach 2:
The patent utilizes flexible elements in the form of expansion joints that can deform elastically to accommodate thermal expansion. These flexible components are designed with appropriate material properties and geometric configurations to absorb thermal stress while maintaining the structural integrity and heat transfer functionality of the heat exchanger.
2Temperature
If conventional heat exchanger structure is used, then heat transfer is achieved, but undesirable pressure drop occurs in the fluids passing through
Solution Approach 1:
The patent employs shell and tube heat exchanger geometry that utilizes three-dimensional space efficiently. The tubular structure provides extended heat transfer surface area while maintaining compact volume. The arrangement of tubes within the shell creates multiple flow paths that distribute fluid flow evenly, reducing localized pressure drops while maintaining effective heat transfer across the temperature gradient.
3Stress or pressure
If shell and tube heat exchanger with expansion joints is used, then thermal stress is reduced, but device complexity increases
Solution Approach 1:
The patent divides the heat exchanger into modular sections with expansion joints positioned at strategic locations. This segmentation allows each section to independently accommodate thermal expansion, reducing the need for complex overall structural designs. The modular approach enables standardized manufacturing and assembly while effectively managing thermal stress through distributed expansion capabilities.
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 configuration reduces thermal stress on components, enhances heat transfer efficiency, and minimizes pressure drop, leading to improved performance in olefin production systems by effectively transferring heat from product streams to hydrocarbon feedstocks.
Implementation Method 1
a shell and tube heat exchanger to transfer heat from the product stream to the hydrocarbon feedstock
Implementation Method 2
significant differences in temperature may result in stress between components of the heat exchanger due to uneven thermal expansion of those components
Implementation Method 3
The outlet tube sheet may be connected to the shell by an expansion joint
Implementation Method 4
refractory materials
Implementation Method 5
separating the particulate solid from the product stream in a gas/solids separation device
Implementation Method 6
passing at least a portion of the product stream and a portion of the hydrocarbon feed stream through a feed stream preheater
Data Source
AI summary
Methods for producing olefins may include contacting a hydrocarbon feed stream with a particulate solid, the contacting of the hydrocarbon feed stream with the particulate solid reacting the hydrocarbon feed stream to form a product stream. The method may include separating the particulate solid from the product stream and passing at least a portion of the product stream and the hydrocarbon feed stream through a feed stream preheater. The feed stream preheater may include a shell and tube heat exchanger comprising a shell, a plurality of tubes extending axially through the shell, a shell side inlet, a shell side outlet, a tube side inlet, a tube side outlet, an inlet tube sheet, and an outlet tube sheet. The outlet tube sheet may be connected to the shell by an expansion joint.