Double-Drainage Coalescing Filter Element for Stable Gas-Liquid Separation
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Solution Overview
Problem
Existing coalescing filter elements suffer from filtration performance degradation due to liquid clogging, increased pressure drop, and droplet re-entrainment, particularly in long-distance natural gas transportation and offshore oil and gas operations, leading to reduced efficiency and increased energy consumption.
Innovation Solution
A coalescing filter element with double drainage layers, featuring an inner and outer coalescing component with an annular drainage space, where the inner component captures most liquid, reducing the load on the outer component, and utilizing filter media with gradient pore diameters and amphiphobic materials to prevent re-entrainment and liquid accumulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single coalescing filter element is used to remove droplets from natural gas, then the initial filtration efficiency is high, but the filtration performance degrades over time due to liquid clogging and droplet re-entrainment
Solution Approach 1:
The filter element is divided into multiple filtration layers with different pore sizes arranged in sequence. The coarse filtration layer (larger pores) is positioned before the fine filtration layer (smaller pores), allowing droplets to be progressively filtered at different stages. This segmentation prevents liquid accumulation and clogging in any single layer, maintaining stable filtration performance throughout the service life.
2Reliability
If the filter media has small pore diameters to capture fine droplets, then the filtration efficiency increases, but the pressure drop increases and liquid clogging occurs more easily
Solution Approach 1:
The filtration process is segmented into multiple stages with progressively smaller pore sizes. The coarse layer with larger pores handles the bulk of droplet removal with lower pressure drop, while the fine layer with smaller pores captures remaining fine droplets. This staged approach achieves high overall filtration efficiency while keeping the pressure drop at manageable levels.
Solution Approach 2:
Different regions of the filter element have different pore size characteristics tailored to their specific functions. The coarse filtration layer has larger pores optimized for handling high liquid loads, while the fine filtration layer has smaller pores optimized for capturing fine droplets. This local optimization allows each region to perform its function efficiently without compromising overall system performance.
3Device complexity
If the filter element structure is simplified to reduce manufacturing cost, then the device complexity decreases, but the ability to prevent droplet re-entrainment and liquid accumulation deteriorates
Solution Approach 1:
The filter element incorporates multiple functional layers including coarse filtration layer, fine filtration layer, and drainage layer, each with specific pore size ranges. This segmented structure is designed to work together as an integrated system that prevents droplet re-entrainment through proper liquid drainage while maintaining a manufacturable form factor.
Solution Approach 2:
The filter element uses porous materials with specifically controlled pore size distributions across different layers. The porous structure provides both filtration functionality and liquid drainage capability, preventing droplet re-entrainment without requiring complex additional components. The porous material properties are optimized to balance filtration efficiency, liquid handling, and structural simplicity.
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 double drainage layer design significantly improves filtration efficiency, prolongs the service life of the filter element, reduces energy consumption, and maintains high performance under fluctuating conditions.
Implementation Method 1
After being coalesced, where tiny droplets in the gas collide, coalesce, and merge into larger droplets inside the filter material of the coalescing filter element
Implementation Method 2
The drained liquid falls on the tube sheet by gravity, and then drains from the coalescing filter element
Implementation Method 3
utilizing filter media with gradient pore diameters and amphiphobic materials to prevent re-entrainment and liquid accumulation
Data Source
AI summary
A coalescing filter element, including an inner coalescing component configured to captured a large amount of liquid in gas, and an outer coalescing component configured to coalesce and filter a small amount of liquid remaining in the gas. The inner coalescing component and the outer coalescing component are cylindrical structures disposed in a vertical direction and opened at two ends. The outer coalescing component is sleeved on an outer side of the inner coalescing component, and an annular drainage space is formed between the inner coalescing component and the outer coalescing component. A top end cap is provided on top ends of the inner coalescing component and the outer coalescing component. A bottom end cap is provided on bottom ends of the inner coalescing component and the outer coalescing component. The bottom end cap is provided with a gas inlet communicated with an interior of the inner coalescing component.