Membrane Dryer for Portable Sampling Systems
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Solution Overview
Problem
Portable sampling systems for drying flue gas to very low dew points are hindered by their significant weight, primarily due to heavy thermal insulation and heating equipment, which complicates operator handling and increases the risk of condensation.
Innovation Solution
Redesigning the system to integrate a single membrane dryer that replaces the heated line, operating at deep vacuum levels and with reduced Nafion™ tubes, allowing for a lower thermal insulation requirement and improved temperature gradient, while maintaining effective moisture removal with lower purge gas flow rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If heavy thermal insulation and heating equipment are used to prevent condensation in portable sampling systems, then condensation risk is reduced, but system weight increases significantly
Solution Approach 1:
The patent changes the operating parameters by introducing deep vacuum operation (below 0.1 bar absolute pressure) in the shell side of the membrane dryer. This parameter change allows the system to operate at lower temperatures without condensation, thereby reducing or eliminating the need for heavy thermal insulation and heating equipment.
Solution Approach 2:
The patent replaces the mechanical/thermal system (heaters and insulation) with a vacuum-based system. By using vacuum pressure to prevent condensation instead of heat, the system eliminates heavy thermal insulation and heating equipment while maintaining condensation prevention.
2Reliability
If traditional heated lines with heavy insulation are used, then condensation is prevented, but device complexity and size increase
Solution Approach 1:
The patent merges the drying function and the condensation prevention function into a single integrated membrane dryer unit. The membrane dryer performs moisture removal while the vacuum system simultaneously prevents condensation, eliminating the need for separate heated lines and insulation components.
Solution Approach 2:
The patent extracts and removes the heavy thermal insulation and heating equipment from the system by replacing them with a vacuum-based condensation prevention mechanism integrated into the membrane dryer operation.
3Productivity
If high purge gas flow rates are used for effective drying, then moisture removal is improved, but energy consumption increases
Solution Approach 1:
The patent employs a feedback mechanism where the vacuum level and drying performance are monitored, allowing optimization of purge gas flow rates. By maintaining deep vacuum, the system achieves effective drying at lower purge gas flow rates, reducing energy consumption while maintaining productivity.
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 redesigned system achieves effective drying to very low dew points with a substantial reduction in weight and size, reducing the risk of condensation and improving operational efficiency.
Implementation Method 1
a membrane dryer, such as a Nafion™ dryer
Implementation Method 2
operating at deep vacuum levels
Data Source
AI summary
A method for drying a gas sample comprises flowing purge gas over the exterior of tubes of a perfluorosulfonic acid membrane and flowing the gas sample through interior of tubes, wherein the drying operation is conducted under deep vacuum and with the purge gas flowing at a rate that is typically less than that of the gas sample being dried.