Coanda Bi-Stable Valve for Pressure-Driven Fuel Staging
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Solution Overview
Problem
Existing fuel valves for industrial burners require additional electro-mechanical components for control, increasing system complexity and cost, and lack the ability to turn staged fuel on or off based on pressure without moving parts.
Innovation Solution
A bi-stable valve utilizing the Coanda effect to control fluid flow through varied back pressures, with convex-shaped walls directing flow to different outlets based on pressure, eliminating the need for moving parts and electrical power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If electro-mechanical valves are used to control fuel flow for staged combustion, then fuel flow control capability is improved, but device complexity and cost increase
Solution Approach 1:
The patent replaces electro-mechanical valves with a purely fluid dynamic system using the Coanda effect. The convex-shaped flow control surfaces redirect fluid flow based on backpressure differentials without any moving parts or electrical components, eliminating mechanical complexity while maintaining flow control capability
Solution Approach 2:
The invention uses fluid pressure differentials and the Coanda effect to control flow distribution. Backpressure at different outlets creates pressure differentials that naturally redirect flow through the convex-shaped passages, using pneumatic/hydraulic principles instead of mechanical actuation
2Adaptability or versatility
If electro-mechanical valves are used for fuel staging control, then staged fuel operation is achieved, but cost and manufacturing complexity increase
Solution Approach 1:
The valve body is segmented into multiple flow control passages with convex-shaped surfaces, each leading to different outlets. This segmentation allows independent control of fuel flow to different burners or stages through geometric design rather than multiple mechanical valves
Solution Approach 2:
The invention changes the geometric parameters of the flow control surfaces (convex shapes, angles, positions) to control flow distribution. By varying these geometric parameters during manufacturing, different staging configurations are achieved without complex assembly or additional components
3Ease of operation
If traditional valves with moving parts are used, then flow control is achieved, but reliability decreases due to wear and mechanical failure
Solution Approach 1:
The patent eliminates all moving parts by using fixed convex-shaped flow control surfaces that redirect fluid flow through the Coanda effect. This substitution of mechanical actuation with fluid dynamic control removes wear, friction, and mechanical failure modes while maintaining flow control function
Solution Approach 2:
The system uses the fluid's own backpressure to automatically control flow distribution. The convex surfaces respond to pressure differentials created by downstream conditions, allowing the fluid to self-regulate its own flow paths without external control mechanisms
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
Enables efficient control of fluid flow without mechanical complexity, allowing staged fuel operation based on geometry, reducing costs and enhancing burner turndown capabilities.
Implementation Method 1
A bi-stable valve utilizes the Coanda effect to control fluid flow through varied back pressures, with convex-shaped walls directing flow to different outlets based on pressure
Data Source
AI summary
A bi-stable valve includes a valve body that has a valve inlet, a first valve outlet, and a second valve outlet. The valve body defines a preferential wall that is convex in shape that draws a flow passing through the valve inlet primarily towards the first valve outlet at a low back pressure at the first valve outlet. The valve body defines a second wall that is convex in shaped to draw the flow passing through the valve inlet more towards the second valve outlet as the back pressure at the first valve outlet increases.