Rotating Plenum Flow Diverter With Purge Barrier Against Leakage
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Solution Overview
Problem
Conventional fluid flow diverters in regenerative thermal oxidizers (RTOs) are complex and prone to leakage due to valve seal issues, necessitating an improved solution that maintains an eccentric mechanical drive assembly while minimizing cross-contamination and leakage.
Innovation Solution
A fluid flow diverter with a rotating plenum and purge fluid assembly that creates a positive pressure fluid barrier, using a single motor and rotating plenum to switch between two fluid flow paths, eliminating the need for poppet or butterfly valves and minimizing leakage by introducing a high-pressure purge fluid between fluid streams.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional valve systems with poppet valves are used to switch fluid flow paths, then the flow pattern can be changed, but the valve seals tend to leak over time and the system becomes complex
Solution Approach 1:
The invention extracts and eliminates the poppet valves and their seals from the system. Instead of using mechanical valves to switch flow paths, the patent uses a rotating plenum that physically redirects fluid flow through geometric configuration. This removes the source of leakage (valve seals) and simplifies the system by eliminating complex valve mechanisms while maintaining the ability to switch between flow paths.
Solution Approach 2:
The invention uses a dynamically rotating plenum instead of static valve components. The plenum rotates to different positions to establish different flow paths, replacing the need for multiple valve components. This dynamic geometric reconfiguration achieves flow switching without mechanical seals that are prone to leakage.
2Ease of operation
If multiple poppet valves are used to control fluid flow in RTO, then flow switching is achieved, but the valve system complexity increases and maintenance difficulty arises
Solution Approach 1:
The invention merges the functions of multiple poppet valves into a single rotating plenum component. Instead of having separate valves for each flow path control, one rotating plenum performs all flow switching functions by rotating to different positions. This consolidation simplifies maintenance as there is only one moving component to service instead of multiple valve assemblies.
Solution Approach 2:
The rotating plenum serves multiple functions: it acts as both a flow distributor and a flow switcher, replacing what would traditionally require multiple specialized valve components. This multi-functional design reduces the number of parts that need maintenance and simplifies the overall system operation.
3Ease of operation
If valve seals are used in conventional fluid flow diverters, then flow direction can be controlled, but leakage occurs over time due to seal degradation
Solution Approach 1:
The invention replaces the mechanical seal-based valve system with a geometric flow redirection system. Flow direction is controlled by the physical orientation and position of the rotating plenum rather than by mechanical seals opening and closing passages. This substitution eliminates seal leakage while maintaining precise flow direction control through geometric configuration.
Solution Approach 2:
The rotating plenum acts as an intermediary that physically guides fluid flow between different paths without requiring sealing surfaces. Instead of seals preventing leakage between high and low pressure zones, the plenum's geometric configuration naturally directs flow, eliminating the need for sealing mechanisms that degrade over time.
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 solution provides a durable, reliable, and easy-to-maintain fluid flow diverter that rapidly changes flow patterns, minimizing cross-contamination and leakage, and is suitable for RTOs, achieving efficient heat exchange with reduced contaminant bypass.
Implementation Method 1
The purge fluid supplied to the rotating plenum creates a positive pressure fluid barrier that prevents or minimizes cross-contamination of the first and second fluid streams in the first and second fluid flow paths.
Data Source
Figure 1A~1B
Figure 2
Figure 3A~3B
AI summary
A fluid flow diverter is provided that includes a diverter body having four ports, a rotating plenum located within the diverter body, and a purge fluid assembly that supplies a purge fluid to the plenum. The plenum has two stop positions that each define a fluid flow path through the diverter. In the first fluid flow path, a first fluid stream goes between the first and second ports, and a second fluid stream goes between the fourth and third ports. In the second flow path, a first fluid stream goes between the first and third ports, and a second fluid stream goes between the fourth and second ports. The purge fluid supplied to the plenum creates a positive pressure fluid barrier that prevents or minimizes cross-contamination of the two fluid streams through the diverter. Also provided is a regenerative thermal oxidizer that includes such a fluid flow diverter.