Gas Distribution Tray for Thermal Separation Columns
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Solution Overview
Problem
Conventional separation columns with dual-flow mass transfer trays experience deteriorated separating action due to inhomogeneous gas distribution, particularly in columns of high diameter, leading to uneven pressure distribution and reduced separation efficiency.
Innovation Solution
Incorporating a gas distribution tray between the lowermost dual-flow mass transfer tray and the gas entry orifice, with orifices designed for vertical gas passage to achieve equal gas distribution across the column cross-section, thereby balancing pressure and enhancing the separating action.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional separation column with dual-flow mass transfer trays is used, then the column structure is simple and easy to manufacture, but the gas distribution becomes inhomogeneous particularly in high diameter columns, leading to deteriorated separating action
Solution Approach 1:
The column is segmented into distinct functional zones: a gas distribution zone at the bottom with a gas distribution tray, and a separation zone above with dual-flow mass transfer trays. This segmentation allows the gas distribution function to be optimized separately from the separation function, ensuring homogeneous gas distribution before the gas enters the separation trays, thereby improving separating action without compromising structural simplicity
Solution Approach 2:
A gas distribution tray is introduced as an intermediary component between the gas entry and the dual-flow mass transfer trays. This intermediate device serves as a mediator that redistributes the incoming gas flow uniformly across the column cross-section, eliminating inhomogeneous gas distribution and pressure variations, thereby enhancing the separating action of the subsequent mass transfer trays
2Productivity
If gas is introduced directly into the column cavity without a gas distribution tray, then the device complexity is low, but the pressure distribution becomes uneven, reducing separation efficiency
Solution Approach 1:
Gas distribution is performed as a preliminary action before the gas enters the separation zone. The gas distribution tray pre-distributes the gas flow uniformly across the column cross-section and equalizes pressure distribution before the gas reaches the dual-flow mass transfer trays. This preliminary gas distribution ensures optimal conditions for separation, maximizing separation efficiency without adding complex control systems
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 gas distribution tray ensures homogeneous gas distribution, improving the separating action between ascending gas and descending liquid, leading to increased efficiency and stability in the separation process.
Implementation Method 1
the orifices being formed so as to bring about equal gas distribution over the column cross section... balancing pressure and enhancing the separating action
Implementation Method 2
heat and mass transfer takes place, which ultimately causes the removal (or separation) desired in the separation column
Implementation Method 3
heat and mass transfer takes place, which ultimately causes the removal (or separation) desired in the separation column
Data Source
AI summary
The present invention relates to a column (1) for thermal treatment of fluid mixtures, having a cylindrical, vertically aligned column body (2) which forms a column cavity (3), having a sequence of vertically spaced-apart dual-flow mass transfer trays (8) which are mounted in the column cavity (3) and which have orifices for passage of liquid and gas in countercurrent, and having at least one gas entry orifice (5) disposed below the lowermost of the sequence of dual-flow mass transfer trays (8). It is a characteristic feature of the column of the invention that a gas distribution tray (9) which is disposed between the lowermost of the sequence of dual-flow mass transfer trays (8) and the gas entry orifice (5) has orifices (32) for vertical passage of gas which can be introduced into the column cavity (3) via the gas entry orifice (5), the orifices (32) being formed so as to bring about equal gas distribution over the column cross section. The invention further relates to a process for thermal treatment of fluid mixtures in such a column (1).