Variable-Area Absorber Canister for Uniform Media Utilization
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Solution Overview
Problem
Existing dry absorber canisters in exhaust gas abatement systems suffer from non-uniform utilization of absorption media, leading to premature deactivation and waste of unspent media due to dead zones and varying reactant concentrations along the chamber length.
Innovation Solution
The design of the canister features a varying cross-sectional area along its length, with a maximum area at the outlet and a tapered shape to improve uniformity of media utilization, combined with baffles or spiral flow paths to enhance residence time and distribution of exhaust gases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a uniform cylindrical chamber is used, then the structure is simple and easy to manufacture, but the absorption media utilization is non-uniform leading to premature deactivation
Solution Approach 1:
The chamber cross-sectional area is varied asymmetrically along its length, being larger at the outlet end and smaller at the inlet end. This asymmetric geometry compensates for the decreasing reactant concentration along the flow path, ensuring more uniform utilization of absorption media throughout the chamber length.
Solution Approach 2:
Different sections of the chamber are given different cross-sectional areas to match the local reaction requirements. The larger cross-section at the outlet end provides more reaction space where reactant concentration is lower, while the smaller cross-section at the inlet end matches the higher reactant concentration region.
2Productivity
If the chamber length is increased to improve treatment efficiency, then more absorption media can be used, but dead zones form and media deactivation becomes non-uniform
Solution Approach 1:
The asymmetric cross-sectional area distribution along the chamber length prevents dead zone formation by ensuring adequate flow velocity and residence time throughout. The varying cross-section maintains turbulent flow conditions that promote uniform reactant distribution and absorption media utilization.
Solution Approach 2:
The cross-sectional area parameter is changed along the chamber length to optimize flow characteristics and residence time distribution. This parameter variation ensures that the linear velocity of exhaust gas remains appropriate throughout the chamber, preventing stagnation and dead zones.
3Duration of action of moving object
If a larger chamber volume is used to increase residence time, then treatment efficiency improves, but the canister size and complexity increase
Solution Approach 1:
The cross-sectional area parameter is varied along the chamber length to achieve the desired residence time without increasing overall chamber volume. The larger cross-section at the outlet end provides extended residence time where reactant concentration is lower, while maintaining a compact overall size.
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
This design enhances the uniformity of absorption media utilization, extending the canister's lifespan and reducing waste by ensuring consistent reaction across the chamber, thereby improving the efficiency and longevity of the abatement process.
Implementation Method 1
Hazardous compounds in the exhaust gas, such as hydrogen chloride, passing through the chamber (3) react with the absorption media to form, for example, inert inorganic salts
Data Source
AI summary
The present invention provides a dry absorber canister for an exhaust gas abatement system. The canister comprises a hollow chamber configured to retain particulate absorption media. The chamber having a cross-sectional area defined by a longitudinally extending wall, and the chamber having a gas inlet at a first end and a gas outlet at a second end. The cross-sectional area of the chamber varies between the first end and the second end. The cross-sectional area of the chamber increases from the gas inlet to a maximum cross-sectional area.