Acid Gas Dehydration Using Auto-Refrigeration to Reduce Glycol Losses
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Solution Overview
Problem
Conventional dehydration processes for acid gas streams are inefficient and costly, leading to significant glycol losses, high corrosion rates, and environmental concerns due to fugitive emissions, and require continuous monitoring and regeneration, which increases the carbon footprint.
Innovation Solution
The method employs isenthalpic expansion through a Joule-Thomson valve to auto-refrigerate a slipstream, which is then recycled to cool and condense water from the acid gas stream, reducing the need for external refrigeration and glycol use, and incorporates a low temperature separator or heat exchanger to manage hydrate formation temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional dehydration processes using glycol are used to remove water from acid gas streams, then water content is reduced, but glycol losses increase, corrosion rates increase, and carbon footprint increases due to continuous regeneration requirements
Solution Approach 1:
The patent extracts water from the acid gas stream through condensation and separation processes, removing the harmful substance (water) without requiring glycol absorption. The water is condensed by cooling the gas stream to below its dew point temperature and separated in a water separator, eliminating glycol losses entirely.
Solution Approach 2:
The system uses the acid gas stream itself to provide the cooling necessary for condensation by expanding a portion of the stream through a Joule-Thomson valve, which auto-refrigerates the slipstream. This self-service approach eliminates the need for external refrigeration and glycol regeneration systems.
2Quantity of substance
If conventional dehydration processes are used, then water content is reduced, but operational costs and capital costs increase due to continuous monitoring and regeneration requirements
Solution Approach 1:
The patent replaces the mechanical glycol absorption and regeneration system with a thermal condensation and separation system. The mechanical complexity of glycol circulation, heating, and regeneration equipment is substituted with simpler cooling and separation infrastructure, improving operational efficiency.
Solution Approach 2:
The system exploits the phase transition of water from vapor to liquid by cooling the acid gas stream below its dew point. This phase change enables efficient water removal through condensation and gravity-based separation, eliminating the need for continuous glycol regeneration and improving operational efficiency.
3Quantity of substance
If temperature is reduced to condense water from acid gas, then water content decreases, but hydrate formation risk increases
Solution Approach 1:
The patent divides the acid gas stream into two paths: one that is cooled for water condensation and another that remains warmer. The cooled stream has water condensed and removed in a separator, while the warmer stream can be used to reheat the dehydrated gas or injected separately, preventing hydrate formation in the final product stream.
Solution Approach 2:
The patent introduces a water separator as an intermediary device between the cooling section and the final gas stream. This separator removes condensed water before the gas can reach temperatures where hydrates would form, acting as a protective barrier against hydrate formation.
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
This approach reduces water content and hydrate formation temperatures, minimizing corrosion and emissions, while lowering capital and operational costs, and reducing the carbon footprint by eliminating the need for costly dehydration equipment and glycol regeneration.
Implementation Method 1
expanding at least a portion of said high pressure stream to form a cooled low pressure stream
Implementation Method 2
Reducing the temperature or increasing the pressure, over a defined range, of an acid gas containing water, such as that which occurs when the acid gas is passed through a compressor, will result in the condensing of some of the water from a gas to a liquid phase
Data Source
AI summary
A method for removing condensable components from a fluid containing condensable components. The method involves optimizing the temperature of an initial feed stream including the condensable components through heat exchange and cooling to condense liquids there from. The liquids are removed to form a gas stream which is then compressed and after-cooled to form a high pressure stream. A portion of the high pressure stream is expanded to form a cooled low pressure stream which is mixed with the initial feed stream to augment cooling and condensation of condensable components in the initial feed stream.