Vacuum-Actuated Exhaust Stack Seal for Complete Emission Capture
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Solution Overview
Problem
Existing emission capture systems for ocean-going vessels fail to properly engage the exterior of the vessel's exhaust stack, resulting in incomplete capture of toxic emissions.
Innovation Solution
A self-energizing seal positioned over the exhaust stack forms an airtight seal with the exterior of the stack, ensuring all emissions are captured by an emissions control system mounted on a barge, which processes and releases clean exhaust gas into the atmosphere.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If prior emission capture systems are used, then emissions can be captured, but they fail to properly engage the exterior of the exhaust stack resulting in incomplete capture
Solution Approach 1:
The seal is designed to be self-energizing, where the vacuum pressure differential automatically causes the seal to engage and conform to the exhaust stack exterior without manual intervention. The system uses its own operating vacuum to force the seal against the stack, making the sealing action self-regulating and reliable.
Solution Approach 2:
The seal utilizes changes in pressure parameters (vacuum vs. atmospheric pressure) to achieve engagement. The vacuum side of the seal experiences lower pressure while the atmosphere side experiences higher pressure, creating a force differential that pushes the seal against the exhaust stack to form a complete seal.
2Reliability
If a seal is applied over the exhaust stack, then emission capture is improved, but the system complexity increases
Solution Approach 1:
The seal mechanism requires no external actuation or complex control systems. It automatically engages and maintains sealing through the natural pressure differential created during vacuum operation, eliminating the need for motors, actuators, or complex positioning mechanisms.
Solution Approach 2:
The seal employs a flexible membrane or shell that can conform to the exhaust stack exterior. This flexible structure allows the seal to adapt to slight variations in stack geometry while maintaining an airtight barrier, simplifying the overall design compared to rigid sealing 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
The system effectively captures all exhaust emissions, preventing their release into the environment and ensuring complete emission control without drawing in outside air.
Implementation Method 1
In operation, the emissions control system draws a vacuum through the exhaust conduit which in turn causes the self-energizing seal to engage the exhaust stack
Data Source
AI summary
A self-energizing seal for use in connection with an emissions control system to capture exhaust emissions from ocean going vessels when they are docked in port. The self-energizing seal including a sealing ring which is drawn into engagement with the exterior wall of the vessel's exhaust stack when a vacuum is drawn by the emissions control system.