Liquid Flow Distributor with Packing Troughs for Mass Transfer
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Solution Overview
Problem
Existing liquid flow distributors in mass transfer columns face challenges in achieving uniform liquid distribution across the packing bed surface, leading to inefficient heat and mass transfer due to uneven drip point density and droplet size, and are prone to fouling and pressure drop issues.
Innovation Solution
A liquid flow distributor comprising a central distribution member with elongated side members and distribution troughs filled with packing material, which divides the liquid stream into multiple portions to ensure uniform distribution across the mass transfer bed, maintaining low pressure drop and resistance to fouling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If liquid is delivered through multiple spaced-apart drip points, then liquid distribution across the packing bed can be achieved, but uniform distribution is difficult to maintain due to variations in drip point density and droplet size
Solution Approach 1:
The distributor is segmented into multiple distribution troughs spaced along the column diameter, each trough independently distributing liquid to a specific radial zone of the packing bed. This segmentation allows uniform distribution across the entire bed surface while maintaining a relatively simple trough structure
Solution Approach 2:
Each distribution trough is designed with specific local characteristics including packing material filling, baffle plate configuration, and outlet slot positioning tailored to achieve uniform liquid flow in its designated radial zone. The local quality of each trough is optimized for its specific function while contributing to overall uniform distribution
2Reliability
If droplet size is increased to reduce entrainment, then liquid carryout by vapor is reduced, but horizontal distribution of liquid across the packing surface is hindered
Solution Approach 1:
The distribution troughs extend in the radial direction perpendicular to the column axis, creating a three-dimensional distribution structure. Liquid flows through the trough length in the radial dimension while also distributing axially along the packing bed, achieving both adequate droplet size and wide horizontal distribution coverage
3Ease of operation
If distributor structure is simplified to reduce fouling and pressure drop, then maintenance and operation are easier, but liquid distribution uniformity and performance window are reduced
Solution Approach 1:
A baffle plate is introduced as an intermediary element within each distribution trough, positioned to control liquid flow distribution to the packing material. The baffle plate mediates between the simple trough structure and the requirement for uniform liquid distribution, ensuring proper liquid spreading while maintaining the simplicity and fouling resistance of the overall design
4Manufacturing precision
If multiple distribution means are combined to achieve uniform liquid distribution, then distribution performance is improved, but device complexity and design robustness are reduced
Solution Approach 1:
Multiple distribution functions are merged into a single integrated distribution trough structure that combines liquid reception, radial distribution via packing material, flow control through baffle plates, and discharge through outlet slots. This merging achieves uniform liquid distribution while maintaining design simplicity and robustness, avoiding the complexity of multiple separate distribution components
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 solution provides a robust and flexible distributor that ensures uniform liquid distribution, enhancing heat and mass transfer efficiency while maintaining low pressure drop and resistance to fouling, suitable for various heat and mass transfer operations.
Implementation Method 1
At least a portion of the liquid receiving space is filled with a bed of packing material and the liquid discharged from the open floor of the distribution troughs has passed through at least a portion of the packing material
Implementation Method 2
liquid discharged from the open floor of the distribution troughs has passed through at least a portion of the packing material
Implementation Method 3
A liquid flow distributor comprising a central distribution member with elongated side members and distribution troughs filled with packing material, which divides the liquid stream into multiple portions to ensure uniform distribution across the mass transfer bed
Data Source
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AI summary
A flow distributor for a liquid descending in a vertically elongated mass transfer column, a mass transfer column employing the same, and a method of treating a fluid stream in the mass transfer column is provided. The flow distributor includes a central distribution member for passing liquid to a plurality of outwardly extending side arm members, which, in turn, feed the liquid into a plurality of distribution troughs located below the elongated side members. The distribution troughs, which may be oriented substantially perpendicularly or substantially parallel to the elongated side members, include a bed of packing material disposed therein. Use of such distributors in vapor-liquid or liquid-liquid columns results in more uniform horizontal distribution of the liquid across the diameter of the column.