Mass Transfer Column Base with Baffle Plate
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Solution Overview
Problem
Mass transfer columns, particularly those with sieve trays and valve trays, suffer from liquid bypassing due to lack of hydraulic sealing, leading to reduced gas-liquid contact and uneven aeration, which worsens at partial loads and with heat transfer elements, causing rain-through issues.
Innovation Solution
A tray design with distributed gas passage openings and at least one baffle plate to deflect liquid flow, featuring a separating weir that divides the liquid into two streams, ensuring equal flow path lengths and alternating inlet and outlet configurations to minimize liquid bypassing and enhance uniform gassing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the gas passage area is reduced to prevent liquid bypassing, then liquid rain-through is reduced, but pressure loss increases sharply
Solution Approach 1:
The tray is divided into multiple segments with distributed gas passage openings (sieve holes, valves, bells, or tunnels) across the active area. This segmentation allows gas to rise through multiple distributed points rather than a single concentrated area, enabling better liquid containment while maintaining adequate gas passage area to control pressure loss.
Solution Approach 2:
Hydraulic sealing elements (such as liquid seals or weirs) are introduced as intermediary structures between the gas passage openings and the liquid phase. These sealing elements prevent liquid from bypassing the mass transfer elements through the gas passage area, allowing the gas passage area to remain sufficiently large without causing rain-through, thus maintaining low pressure loss while preventing harmful liquid bypassing.
2Duration of action of moving object
If baffles are added to lengthen the liquid flow path for better contact time, then gas-liquid contact time increases, but liquid gradient causes uneven aeration and rain-through in inlet area
Solution Approach 1:
The tray design implements local quality variations through strategically positioned baffles and distributed gas passage openings. Different regions of the tray have tailored configurations - for example, the inlet area may have specific baffle arrangements or gas passage densities to prevent rain-through, while other areas are optimized for extended contact time. This localized optimization allows the liquid flow path to be lengthened for better contact without creating harmful gradients and uneven aeration.
3Use of energy by moving object
If heat transfer elements are added to maximize heat exchange surface, then heat exchange efficiency increases, but uniform gassing is impeded and rain-through increases
Solution Approach 1:
Heat transfer elements (such as tubes or plates) are segmented and distributed across the tray surface rather than concentrated in one area. This segmentation allows gas passage openings to be distributed around and between the heat transfer elements, ensuring uniform gas distribution while maintaining adequate heat exchange surface area. The distributed configuration prevents heat transfer elements from blocking gas flow paths and causing rain-through.
Solution Approach 2:
Heat transfer elements are arranged in multiple layers or at different heights above the tray floor, creating a three-dimensional heat exchange structure. This dimensional arrangement allows gas to flow through multiple levels and around heat transfer elements, maintaining uniform gassing while maximizing heat exchange surface area. The vertical dimension provides additional gas flow paths that prevent rain-through caused by horizontal blockages.
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 reduces liquid rain-through, extends the operating range of mass transfer columns to partial loads, and maintains consistent liquid treatment and composition, improving separation performance and heat exchange efficiency.
Implementation Method 1
at least one guide plate for deflecting the flow of liquid flowing on the tray
Implementation Method 2
gas passage openings distributed over the tray... Mass transfer columns are, for example, distillation columns, absorption columns or stripping columns in which materials are separated by intensive contact between the liquid and gaseous phases
Implementation Method 3
at least one separating weir separating the incoming liquid into two streams
Data Source
Figure 1~2
Figure 3~4
AI summary
The invention relates to a base for a mass transfer column, comprising gas through-openings which are distributed over the base (1) and at least one baffle plate (11) for directing the flow of liquid flowing on the base, said base (1) being loadable with a liquid via at least one inlet (3). The base has at least one inlet (3), at least one separating weir (5) which separates the inflowing liquid into two flows, and at least two outlets (12) or at least two inlets (3) and at least one outlet (12) for the liquid. Each flow flows along a flow path (7; 9) to an outlet (12). The invention further relates to a mass transfer column which contains the base and to a use of the base and the mass transfer column.