Hybrid Contact Tray Segmentation for Mass Transfer Columns
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Solution Overview
Problem
Mass transfer columns experience reduced efficiency and capacity due to froth buildup during vapor-liquid mixing, which can lead to entrained vapor and liquid flow issues, affecting the overall performance of the tray and column.
Innovation Solution
A hybrid contact tray design incorporating both cross-current and co-current vapor-liquid mixing sections, with co-current mixing devices featuring a conduit with a vapor inlet, froth inlet, and packing material, enhances mixing and separation, reducing froth buildup and increasing vapor flow without increasing operational costs or reducing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If cross-current mixing is used to enhance vapor-liquid contact, then mixing efficiency is improved, but froth buildup increases reducing tray capacity
Solution Approach 1:
The tray is divided into multiple mixing sections (cross-current mixing section and co-current mixing section) with different mixing mechanisms. The cross-current section provides intense mixing for efficiency, while the co-current section with packing material reduces froth buildup, allowing each section to address specific needs without compromising the other.
Solution Approach 2:
Packing material is introduced as an intermediary element in the co-current mixing section. This packing material facilitates gentle mixing and reduces froth formation while maintaining contact efficiency, acting as a mediator between the vapor and liquid streams to achieve the desired mixing without harmful froth buildup.
2Productivity
If vapor flow rate is increased to improve column capacity, then material throughput is enhanced, but froth buildup and entrainment increase reducing efficiency
Solution Approach 1:
The mixing process is segmented into two distinct zones: a cross-current mixing section for high-intensity contact and a co-current mixing section with packing material for froth control. This segmentation allows the system to handle higher vapor flow rates while maintaining efficiency by preventing froth buildup in the second section.
Solution Approach 2:
The invention changes the mixing parameters by introducing packing material in the co-current section, which modifies the flow characteristics and reduces froth formation. This parameter change allows the system to operate at higher vapor flow rates without sacrificing tray efficiency, as the packing material controls the vapor-liquid interaction to prevent entrainment.
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 hybrid tray configuration improves the interfacial contact area between vapor and liquid, increasing the column's operating capacity and efficiency while minimizing froth, thereby enhancing material throughput and vapor flow.
Implementation Method 1
a co-current mixing device associated with a second portion of the plurality of orifices. The co-current mixing device comprises a conduit having: a vapor inlet in fluid communication with one or more of the second portion of orifices; a froth inlet in fluid communication with the liquid flow path; a fluid outlet; and a packing material disposed within a co-current flow path of vapor and liquid within the conduit disposed after the vapor and froth inlets and before the fluid outlet.
Data Source
AI summary
A hybrid Contact tray for a mass transfer column is provided. The tray has a deck for passage of liquid along a liquid flow path thereon. The deck also has a plurality of orifices for passage of ascending vapor through the tray deck. The contact tray includes a cross-current vapor-liquid mixing section having a first portion of the plurality of orifices and a co-current vapor-liquid mixing section having at least one co-current mixing device associated with a second portion of the plurality of orifices. The co-current mixing device includes a conduit having: a vapor inlet in fluid communication with one or more of the second portion of orifices; a froth inlet in fluid communication with the liquid flow path; a fluid outlet; and a packing material within a co-current flow path of vapor and liquid within the conduit disposed after the vapor and froth inlets and before the fluid outlet.