TEG Reboiler Combustion Control via Oxygen Feedback
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Solution Overview
Problem
Current natural gas dehydration systems using glycol regeneration fired-heaters face inefficiencies in fuel consumption and incomplete combustion, leading to thermal energy losses and reduced equipment lifetime, due to manual control of air and fuel ratios in the fired-heater reboiler.
Innovation Solution
An automated control system adjusts the flow rates of air and fuel to maintain a specified ratio and optimize combustion efficiency, controlling the TEG bath temperature and oxygen gas content in the stack effluent to achieve efficient combustion and reduce fuel consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual control of air and fuel ratios is used in the fired-heater reboiler, then operation simplicity is maintained, but combustion efficiency deteriorates and fuel consumption increases
Solution Approach 1:
The system employs a feedback control mechanism where oxygen content in the stack effluent is continuously measured and used to automatically adjust the air-to-fuel ratio. The controller receives oxygen content signals and modifies air and fuel flow rates to maintain optimal combustion, eliminating the need for manual control while improving combustion efficiency through continuous optimization.
2Device complexity
If manual control of air and fuel ratios is used in the fired-heater reboiler, then device complexity is reduced, but thermal energy losses increase
Solution Approach 1:
The feedback control system continuously monitors oxygen content in the stack effluent and automatically adjusts air and fuel flow rates to maintain optimal combustion conditions. This eliminates thermal energy losses from incomplete combustion by ensuring the correct air-to-fuel ratio is maintained at all times, with the controller receiving oxygen signals and modifying flows accordingly.
Solution Approach 2:
The patent replaces manual mechanical control of air and fuel valves with an automated control system that uses electrical signals from oxygen sensors to actuate control valves. This substitution of manual mechanical operation with an automated electromechanical system reduces thermal energy losses while the added complexity is confined to the control instrumentation rather than the core heating process.
3Ease of operation
If manual control of air and fuel ratios is used in the fired-heater reboiler, then ease of operation is maintained, but equipment lifetime is reduced
Solution Approach 1:
The feedback control system continuously monitors combustion conditions through oxygen content measurement and automatically adjusts the air-to-fuel ratio to prevent incomplete combustion. This eliminates the formation of soot and carbon deposits that would otherwise accumulate on heat transfer surfaces and burner components, thereby preventing premature equipment failure and extending the service life of the fired-heater reboiler.
4Use of energy by moving object
If automated control system is implemented to optimize air-to-fuel ratio, then combustion efficiency is improved, but device complexity increases
Solution Approach 1:
The system uses a feedback control architecture where oxygen content in the stack effluent is measured by a sensor and the signal is fed to a controller that automatically adjusts air and fuel flow rates. This feedback mechanism improves combustion efficiency by maintaining optimal air-to-fuel ratios, while the complexity is confined to the control instrumentation rather than the core heating process.
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 automated control system enhances combustion efficiency, reduces fuel consumption, minimizes thermal energy losses, and extends equipment lifetime by maintaining optimal air-to-fuel ratios and oxygen levels, thereby improving the regeneration of triethylene glycol in natural gas dehydration systems.
Implementation Method 1
The fired-heater reboiler includes a burner and a reboiler vessel
Implementation Method 2
controlling TEG bath temperature in the reboiler vessel and weight percent of oxygen gas in stack effluent from the burner by a control system automatically adjusting flow of air and fuel to the burner
Implementation Method 3
removing water from TEG in a TEG regeneration still column
Implementation Method 4
The TEG regeneration still column to receive rich TEG, discharge water vapor overhead, and discharge lean TEG
Data Source
AI summary
A system and method of regenerating triethylene glycol (TEG) in natural gas dehydration, including removing water from TEG in a TEG regeneration still column having a fired-heater reboiler that includes a burner and a reboiler vessel. The TEG bath temperature in the reboiler vessel and the oxygen gas content in a stack effluent from the burner are controlled automatically via a control system adjusting flow of air and fuel to the burner while maintaining a specified weight ratio of the air to the fuel.