Synthesis Loop Pressure Control Using Anti-Surge Gas Recirculation
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Solution Overview
Problem
The challenge of controlling pressure fluctuations in ammonia or methanol synthesis loops due to variable renewable energy supply, leading to mechanical stress and potential equipment failure, is not adequately addressed by traditional methods, especially in green production scenarios where inert content is low.
Innovation Solution
Implementing an anti-surge control valve and/or compressor flow regulation valve in the recirculation loop to manage the flow of fresh synthesis gas, combined with temperature control in a high-pressure separator, ensuring constant pressure and reduced reactivity, thereby stabilizing the loop operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If variable renewable energy supply is used for ammonia or methanol synthesis, then green production is achieved, but pressure fluctuations occur causing mechanical stress and potential equipment failure
Solution Approach 1:
A dedicated pressure control valve is introduced as an intermediary device in the synthesis loop to mediate between the variable renewable energy input and the synthesis reactor. This valve actively regulates the fresh synthesis gas flow to maintain constant loop pressure, preventing mechanical stress on equipment while preserving green production capabilities
Solution Approach 2:
The system dynamically changes the flow rate parameter of fresh synthesis gas based on renewable energy availability and loop pressure conditions. By adjusting this parameter in real-time, the system accommodates variable renewable energy input while maintaining stable operating pressure to prevent equipment failure
2Device complexity
If traditional ammonia or methanol loop operation is used without dedicated pressure control, then device complexity is reduced, but pressure fluctuations occur leading to mechanical stress conditions
Solution Approach 1:
A dedicated pressure control valve serves as an intermediary component specifically introduced to address mechanical stress caused by pressure fluctuations. This single targeted addition provides the necessary pressure stabilization without requiring complete redesign of the entire control system
Solution Approach 2:
The control function is segmented by dedicating a specific valve solely for pressure control, separate from other loop functions. This segmentation allows the pressure control task to be handled independently and efficiently, addressing mechanical stress without unnecessarily complicating the overall 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 method effectively maintains constant pressure and reduces mechanical stress, preventing equipment failure by smoothing out pressure and temperature fluctuations, even with variable renewable energy input.
Implementation Method 1
flow of the loop recirculation gas through the anti-surge valve and/or the recirculation compressor flow regulation valve is controlled to obtain a substantially constant pressure in the ammonia or methanol synthesis loop
Implementation Method 2
pressurizing the loop recirculation gas from step (e) in the loop recirculation compressor
Data Source
AI summary
A method for the control of pressure in a loop for the preparation of ammonia or methanol by using an anti-surge control valve of a compressor and/or a compressor flow regulation valve for the recirculation of loop recirculation gas at variating flow supply of fresh synthesis gas.