Flare Gas Recovery Magnetic Separation for Iron Sulfide Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for mitigating flow assurance issues in flare gas recovery units (FGRUs) are inefficient in removing small iron sulfide particles, leading to compressor damage and reduced reliability due to their ferromagnetic nature.
Innovation Solution
Implementing a magnetic filtration system upstream of the FGRU compression system to trap ferromagnetic particles using powerful magnets, combined with a multistage compression system and high-efficiency separators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional separation methods (strainers, filters, cyclonic separators) are used to remove iron sulfide particles, then the system structure is simple, but the separation efficiency is low and small particles pass through causing compressor damage
Solution Approach 1:
The patent replaces conventional mechanical separation methods (strainers, filters, cyclonic separators) with a magnetic separation system. The magnetic separator uses magnetic fields to attract and remove ferromagnetic iron sulfide particles from the gas stream, achieving high separation efficiency for fine particles without the complexity and maintenance issues of mechanical filtering systems
Solution Approach 2:
The patent changes the separation mechanism from mechanical filtration to magnetic field interaction. By utilizing the ferromagnetic properties of iron sulfide particles, the system transforms the separation approach to use magnetic field strength as the key parameter, enabling effective removal of particles as small as 3-5 microns that would pass through conventional mechanical separators
2Reliability
If chemical inhibition and dissolution methods are used to mitigate flow assurance problems, then chemical treatment is applied, but the method is ineffective for small iron sulfide particles and adds chemical complexity
Solution Approach 1:
The patent replaces chemical inhibition and dissolution methods with a physical magnetic separation system. This eliminates the need for chemical additives and treatment processes, providing a cleaner, more reliable method for removing iron sulfide particles that does not involve chemical complexity or environmental concerns associated with chemical treatments
3Duration of action of stationary object
If no particle removal system is installed, then the system is simple, but iron sulfide particles cause compressor damage and reduced lifespan
Solution Approach 1:
The patent implements a preliminary magnetic separation stage before the compression system. The magnetic separator is positioned upstream to remove iron sulfide particles before the gas enters the compressor, preventing particle-related damage in advance and extending equipment lifespan without requiring complex post-compression treatment systems
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 flow assurance, improves compressor reliability, extends FGRU lifespan, and reduces operational costs by effectively capturing and removing ferromagnetic particles.
Implementation Method 1
a magnetic separator coupled to the outlet of the high-efficiency separator
Implementation Method 2
performing a gravity separation of entrained materials from the flare gas
Data Source
AI summary
A system and a method for flow assurance for a flare gas recovery unit are provided. An exemplary flow assurance system includes a knockout drum having a flare header coupled to an inlet, a high-efficiency separator coupled to an outlet of the knockout drum, a magnetic separator coupled to the outlet of the high-efficiency separator, and a multistage compression system coupled to the outlet of the magnetic separator.