Predictive Controller for Acetylene Plant Compressor Suction Pressure
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Modern acetylene production plants with reduced buffer volume, lacking electrostatic filters and gasometers, face disruptions and shutdowns due to abrupt changes in mass flow rates, which conventional controllers cannot effectively manage, leading to operational instability and economic losses.
Innovation Solution
Implementing a higher-level model-supported predictive controller in conjunction with conventional controllers to regulate the suction pressure of compressors, allowing for recycling and diversion of reaction gas mixture to maintain continuous operation and prevent shutdowns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional controllers with slow control characteristic are used to maintain suction pressure, then the system is simple to operate, but abrupt changes in mass flow rate cannot be controlled, leading to shutdowns
Solution Approach 1:
The model-supported predictive controller performs preliminary actions by calculating future mass flow rates and pressures based on current process state and historical data, enabling proactive adjustment before abrupt changes occur, thus preventing shutdowns without requiring complex real-time control systems
Solution Approach 2:
The control system implements feedback by continuously monitoring actual mass flow rate and pressure deviations, comparing them with predicted values, and adjusting controller output accordingly, enabling reliable detection and mitigation of disruptions while maintaining operational simplicity
2Ease of manufacture
If plants with reduced buffer volume operate without electrostatic filters and gasometers, then capital costs are reduced, but operational stability deteriorates due to inability to buffer mass flow rate changes
Solution Approach 1:
The patent replaces mechanical buffer systems (gasometers, electrostatic filters) with an information-based control system that uses historical data and predictive algorithms to manage mass flow rate stability, achieving the same functional outcome without the capital costs and maintenance requirements of physical buffering infrastructure
Solution Approach 2:
The control system dynamically changes operational parameters (mass flow rate setpoints, pressure controls) based on predicted process behavior, enabling the plant to compensate for the absence of physical buffer volume and maintain stable operation despite reduced infrastructure
3Productivity
If the residence time in the reaction zone is reduced to increase acetylene yield, then productivity increases, but control of mass flow rate fluctuations becomes more difficult
Solution Approach 1:
The predictive controller performs preliminary calculations of future mass flow rates and pressures based on current process state, enabling proactive adjustment before fluctuations occur, thus maintaining process stability even with reduced residence time and increased productivity
Solution Approach 2:
The control system ensures continuous useful action by continuously monitoring and adjusting process parameters to maintain optimal operating conditions, preventing interruptions and maintaining high acetylene yield through sustained stable operation rather than batch processing
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
Ensures continuous acetylene production by reliably detecting and mitigating disruptions, reducing apparatus wear, and preventing cascading shutdowns, even in plants with limited buffer volume, thus minimizing production interruptions and economic losses.
Implementation Method 1
a higher-level model-supported predictive controller which reacts to abrupt changes in the mass flow rate of the reaction gas mixture
Implementation Method 2
the reaction gas mixture is conducted through one or more compressors, the pressure of the reaction gas mixture on the suction side of the compressor being controlled
Implementation Method 3
the pressure of the reaction gas mixture on the suction side of the compressor being controlled within a predefined range by means of a conventional controller
Data Source
AI summary
A process is proposed for continuously operating a plant for preparing acetylene from hydrocarbons by partial oxidation, cleavage in an arc or pyrolysis of hydrocarbons to obtain a reaction gas mixture which is conducted through one or more compressors, the pressure of the reaction gas mixture on the suction side of the compressor being controlled within a predefined range by means of a conventional controller, which comprises additionally using a high-level model-supported predictive controller which reacts to abrupt changes in the mass flow rate of the reaction gas mixture.