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System Title
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Emergency Shutdown System for Methanol Production (Unit M-750)
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Purpose of System Development
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Enhancement of the system reliability by replacing out-of-date ESD devices with new ones. Minimizing losses from unplanned production shutdown and prevention of emergency situations.
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Description of Automation
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Methanol production consists of the following stages:
- Compression of natural gas by a centrifugal compressor
- Two degree natural gas stripping from sulfur compound (hydrogenation and adsorption)
- Catalytic conversion (reforming) of hydrocarbons of stripped natural gas with water steam in a tube heater
- Centrifugal compression of the obtained syngas with the consequent transfer of syngas to circulation compressor inlet for methanol synthesis
- Methanol synthesis
- Two stage rectification of crude methanol
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System Functions
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- Finding the prime cause for process shutdown
- Warning on emergency situations coming up when there is some deviation from the ultimate permissible values in all operation modes
- Control of fast operating devices closing the flow
- Safe shutdown or transfer of process flow into safe state as per preset program
- Displaying process flow charts with parameters, emergency and warning messages and trends
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Design
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ESD system for methanol production unit M-750 is based on DeltaV microchips by Emerson Process Management and manufactured using logic units DeltaV SIS corresponding to SIL-3 and international safety standard IEC 61511.
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