Gas-Liquid Separation Device for H-Oil Reactors
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Solution Overview
Problem
Current gas-liquid separation devices in H-oil process reactors, such as 'spiral risers', are inefficient in separating gas from liquid, leading to gas being reintroduced into the reaction zone, which can cause cavitation and reduce the effectiveness of the recycling process.
Innovation Solution
A gas-liquid separation device with vertically oriented separation elements featuring a specific geometry, including two bends in distinct planes, optimally angled and spaced to enhance separation efficiency, allowing for the majority of liquid to be recycled without gas, thereby improving the separation efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional spiral risers are used for gas-liquid separation, then the device structure is simple, but the separation efficiency is low causing gas to be reintroduced into the reaction zone
Solution Approach 1:
The separation device is divided into multiple independent separation elements (27, 28) with specific geometric configurations including bends at defined angles. Each element acts as an independent separation unit, and multiple elements work in parallel to achieve high overall separation efficiency while maintaining manageable structural complexity
Solution Approach 2:
The separation elements incorporate bends in different planes (first bend in yz-plane, second bend in xy-plane) rather than simple linear or single-plane spiral configurations. This multi-dimensional geometric arrangement enhances the separation mechanism by creating complex flow patterns that improve gas-liquid separation efficiency
2Reliability
If gas is not properly separated from liquid, then the recycling process is simplified, but cavitation occurs and effectiveness is reduced
Solution Approach 1:
The device extracts and removes gas from the liquid phase through multiple separation elements before liquid recycling. Gas is separated out in the upper part of each separation element and directed to gas outlet, ensuring that only liquid free of gas bubbles is reintroduced to the reaction zone, thereby preventing cavitation
Solution Approach 2:
The separation device performs preliminary gas removal before liquid recycling occurs. By pre-separating gas from liquid in the recycle cup, the system prevents the harmful effect of cavitation that would occur if gaseous liquid were reintroduced to the high-pressure reaction zone
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 new device achieves higher gas-liquid separation efficiencies, ensuring that the recycled liquid contains minimal to no gas, preventing cavitation and improving the overall hydroconversion process by effectively recycling liquid back to the reaction zone.
Implementation Method 1
Each separation element consists of a tubular inlet element that admits the gas-liquid mixture, ending in the succession of two bends situated in two distinct planes
Implementation Method 2
The gas-liquid mixture is admitted via the pipes. Gas/liquid separation takes place in the devices. The liquid flowing after leaving the separation elements along the conical wall is collected by the outlet downpipe, and the gas is removed by the outlet of the second bend
Data Source
AI summary
A device for gas-liquid separation, intended to equip three-phase fluidized bed reactors such as those used in the H-oil process. The device has a succession of two bends situated in different planes, which device accomplishes excellent separation of the gas and of the liquid.