System Title

Emergency Shutdown System for Methanol Production (Unit M-750)

Purpose of System Development

Enhancement of the system reliability by replacing out-of-date ESD devices with new ones.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.

Description of Automation

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

System Functions

• 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

Design

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.