Isobaric Pressure Exchanger for Amine Gas Processing
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Solution Overview
Problem
The amine gas treating process for natural gas processing expends large amounts of energy in pressurizing amine solutions, which is lost when sour gases are stripped, leading to inefficiencies and increased costs.
Innovation Solution
An isobaric pressure exchanger (IPX) is integrated into the amine gas processing system to transfer pressure from the rich amine stream to the lean amine stream, reducing energy expenditure and optimizing the process by controlling the mixing of amine streams, thereby reducing capital and operational costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional pressure exchangers are used to transfer pressure energy between amine streams, then energy recovery is improved, but harmful mixing between rich and lean amine streams occurs causing contamination
Solution Approach 1:
A piston serves as an intermediary element that transfers pressure energy from the rich amine stream to the lean amine stream without allowing direct contact between the two streams. The piston is contained within a cylinder that is impermeable to both amine streams, ensuring complete isolation while enabling mechanical energy transfer through piston movement.
Solution Approach 2:
The pressure exchanger is divided into distinct isolated chambers - a rich amine stream chamber and a lean amine stream chamber - separated by the piston. This segmentation allows each stream to be processed independently while still enabling energy transfer through the mechanical coupling of the piston system.
2Use of energy by moving object
If pressure exchanger is integrated into amine gas treating system, then energy consumption is reduced, but device complexity increases
Solution Approach 1:
The pressure exchanger performs multiple functions simultaneously: it acts as a pressure recovery device for the rich amine stream, a pressurization device for the lean amine stream, and a flow control element. This multi-functionality reduces the need for separate pumps and pressure control devices, thereby reducing overall system complexity despite the sophisticated internal piston mechanism.
3Adaptability or versatility
If flow control valve is added to bypass rich amine around IPX, then operational flexibility is improved, but device complexity increases
Solution Approach 1:
A bypass line with a flow control valve is introduced to enable dynamic adjustment of rich amine flow distribution. The valve allows operators to vary the proportion of rich amine that passes through the IPX versus the bypass line, providing adaptability for different operating conditions while maintaining a relatively simple additive modification to the system.
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 use of an IPX in the amine gas processing system significantly reduces energy consumption, lowers carbon footprint, and enhances operational flexibility, allowing for increased throughput and profitability by minimizing the need for additional equipment and reducing electrical power constraints.
Implementation Method 1
The IPX is further configured to transfer pressure from the rich amine stream entering the IPX at a first pressure to the lean amine stream leaving the IPX at a second pressure
Data Source
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Figure 3~6
AI summary
A system includes an amine gas processing system that includes a contactor configured to remove an acid gas from an untreated natural gas using an amine in a lean amine stream, output a treated natural gas, and output a rich amine stream. The system also includes a regenerator configured to regenerate the amine in the rich amine stream, output the lean amine stream, and output the acid gas. The system also includes an isobaric pressure exchanger (IPX) configured to transfer the rich amine stream from the contactor to the regenerator and to transfer the lean amine stream from the regenerator to the contactor.