Shell-Side Flow Distributor for Uniform Tube-Bundle Heat Transfer
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Solution Overview
Problem
Heat exchangers with cross-flow shell-sides experience flow maldistribution, liquid entrainment, and inefficient heat transfer due to direct fluid passage between inlet and outlet nozzles, leading to uneven heat transfer across the tube bundle.
Innovation Solution
A shell-side flow distributor is introduced, comprising an inlet flow distributor and flow guidance system, which includes distributor plates and flow guidance plates to evenly distribute fluid across all zones of the tube bundle, enhancing turbulence and heat transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If cross flow shell-side configuration is used, then heat exchanger structure is simple, but flow maldistribution and liquid entrainment occur
Solution Approach 1:
The shell-side flow path is segmented into multiple zones by dividing the shell into sections with baffle plates. The inlet nozzle is divided into multiple inlet ports, and the outlet nozzle is divided into multiple outlet ports, creating separate flow paths that prevent direct through-flow and promote uniform distribution across the tube bundle.
Solution Approach 2:
A flow distributor plate is introduced as an intermediary component between the inlet nozzle and tube bundle. This plate includes multiple inlet ports and outlet ports with flow distribution channels that actively guide and evenly distribute the shell-side fluid across all zones, preventing direct flow paths and liquid entrainment.
2Stress or pressure
If direct flow path between inlet and outlet nozzles is allowed, then pressure drop is reduced, but heat transfer efficiency decreases
Solution Approach 1:
The flow distributor plate incorporates dynamic flow distribution channels that actively direct fluid flow through multiple zones rather than allowing direct flow. The channels create a controlled flow pattern that increases heat transfer efficiency by ensuring all tube bundle zones are utilized, while still maintaining reasonable pressure drop through optimized channel design.
3Device complexity
If inlet and outlet nozzles face each other, then device complexity is minimized, but dead zones are created in tube-bundle zones
Solution Approach 1:
The shell is segmented into multiple zones using baffle plates, and the flow distributor plate segments the inlet and outlet flows into multiple ports. This segmentation ensures that fluid is distributed to all zones including previously dead zones (D-1 and D-4), activating the entire tube bundle surface area for heat transfer.
Solution Approach 2:
The flow distribution system provides localized flow control to different zones of the tube bundle. The flow distributor plate creates locally optimized flow paths that ensure each zone receives appropriate fluid flow, transforming dead zones into active heat transfer zones with proper fluid circulation.
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 system improves heat transfer performance by 30% to 50% by ensuring uniform flow distribution, reducing liquid entrainment, and increasing turbulent flow, thereby optimizing heat exchanger size and efficiency.
Implementation Method 1
the inlet flow distributor is configured to disperse the fluid to each zone of a tube-bundle positioned in the shell side
Implementation Method 2
enhancing turbulence and heat transfer
Implementation Method 3
improves heat transfer performance by 30% to 50%
Data Source
AI summary
A device for distributing flow through a shell side of a shell-and-tube heat exchanger, the device comprising a shell-side flow distributor configured to direct flow through all zones of a tube-bundle positioned in the shell, the shell-side flow distributor comprising an inlet flow distributor configured to direct flow from an inlet nozzle to all zones of the tube-bundle, the inlet flow distributor comprising an inlet distributor plate positioned proximate to the inlet nozzle in the shell side; and one or more window distributor plates, each window distributor plate comprising a window extending through a thickness of the window distributor plate, wherein the one or more window distributor plates are arranged in a vertical stack adjacent to the inlet distributor plate; and a flow guidance system, the flow guidance system disposed in the tube-bundle, wherein the flow guidance system comprises one or more flow guidance plates.