Dynamic Light Liquid Outlet for Slug Catcher Separation
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Solution Overview
Problem
Conventional slug catchers face challenges in handling large liquid slugs, leading to inefficient separation of gas, light liquid, and heavy liquid, which can result in downstream unit starvation and potential shutdowns due to limited water removal capacity and increased risk of overfilling.
Innovation Solution
A system with a downwardly sloping separation vessel and dynamic control of light liquid outlet heights, utilizing a collector vessel and control valves to manage liquid levels and prevent slug catcher overfilling, allowing for improved slug handling without increasing vessel size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the outlet for light liquid is arranged at a higher position to handle large liquid slugs, then the slug handling capacity is improved, but the size and volume of the slug catcher increases
Solution Approach 1:
The patent applies dynamics by making the light liquid outlet position adjustable rather than fixed. The system uses a movable outlet structure that can be dynamically repositioned to different heights within the separation vessel, allowing the slug catcher to adapt to varying liquid levels and slug sizes without requiring a larger overall vessel volume.
Solution Approach 2:
The patent changes the parameter of outlet position from a static design parameter to a variable parameter. By enabling the outlet height to be changed during operation based on liquid level conditions, the system optimizes separation performance for different operating conditions (normal operation vs. slug handling) without increasing the vessel's physical dimensions.
2Quantity of substance
If the separator vessels are made larger to accommodate large liquid slugs, then the liquid slug capacity is improved, but the equipment cost and space requirement increases
Solution Approach 1:
The patent uses a dynamically adjustable outlet system that allows the existing vessel volume to be optimally utilized for different conditions. During slug events, the outlet is repositioned to accommodate higher liquid levels, effectively increasing the usable capacity without physically enlarging the vessel.
Solution Approach 2:
The adjustable outlet mechanism enables the separator vessel to perform multiple functions: normal gas-liquid separation at standard operating levels, and slug accommodation at elevated liquid levels. This multi-functionality allows a single vessel design to handle both routine operations and abnormal slug conditions without requiring separate dedicated volumes for each function.
3Reliability
If the maximum removal rate of water is limited by downstream processing capacity, then the downstream units are protected from overload, but the time to clear liquid accumulation increases
Solution Approach 1:
The system performs preliminary separation of light liquid from heavy liquid within the slug catcher before discharge to downstream units. By removing a portion of the liquid burden (particularly light liquid) at the separator, the system prepares the fluid stream in advance, reducing the load on downstream processing units and preventing overload conditions.
Solution Approach 2:
The separator vessel acts as an intermediary between the slug catcher and downstream processing units. It provides a buffer zone where initial separation occurs, mediating the flow of liquids to downstream units and preventing direct transmission of excessive liquid loads that could cause overload.
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
Enhances slug handling performance by dynamically controlling light liquid withdrawal, stabilizing liquid movement, and improving separation between heavy and light liquids, preventing downstream unit starvation and reducing the risk of overfilling.
Implementation Method 1
The slug catcher can in particular be designed to perform a gravity separation or pre-separation of the fluid into gas, light liquid and heavy liquid.
Implementation Method 2
separating a fluid stream comprising gas, a light liquid and a heavy liquid
Data Source
AI summary
A system (1) for separating a fluid stream (2) comprising gas, a light liquid and a heavy liquid, the system comprising a separation vessel (5) that is arranged to define a downwardly extending separation space and comprises a downwardly sloping tube (8), the separation space having an inlet (10) for the fluid stream at a first height, an outlet (20) for heavy liquid at a second height below the first height, an outlet (30) for light liquid at a third height between the first and second heights, an outlet (70) for gas above all outlets for liquid, wherein a further outlet (51, 56) for light liquid is provided at a fourth height between the first and third heights, and wherein at least the outlet at the third height is provided with a control valve (33) that is operative to open and close in dependence of the type of liquid in the pipes at that level, and a method of separating a fluid stream comprising gas, a light liquid and a heavy liquid in such a system, wherein an indication of height of an interface between heavy and light liquid in the separation vessel is obtained and the control valve at the third outlet is operated in dependence on the height of the interface.