System Title

Distributed Control System for Methanol Production (M-750 Unit).

Purpose of System Development

The system is aimed for continuous monitoring of parameters and automated control of methanol production process.

Description of Automation

Methanol production consists of the following stages:

• Compression of natural gas by a centrifugal compressor
• Two degree natural gas stripping from sulphur compound (hydrogenation and adsorption)
• Catalytic conversion (reforming) of hydrocarbons from stripped natural gas with water steam in a tube heater
• Compression of the obtained syngas by centrifugal compression with consequent transfer of syngas to circulation compressor inlet for methanol synthesis
• Methanol synthesis
• Two stage rectification of crude methanol

System Functions

• Conversion of measured values of process parameters (pressure, flow rate, temperature, level etc) into unified analogue, discrete and digital signals
• Automatic scanning of analogue and digital field instrumentation sensors and normalizing transducers
• Linearization (for measuring signals of temperature and flow rate), scaling and if necessary filtration (smoothing) and averaging of signals from high frequency interference and pulses
• Scaling and conversion into actual data as per calibration features of signal
• Checking analogue signals as per their confidence level
• Automatic receipt of signal from the terminal, trip points etc
• Generating warning and emergency signals
• Processing control signals as per preset algorithms
• Generating (as per control algorithm) and sending control (digital and analogue) signals to actuating devices
• Generating and sending control digital and analogue signals at least ten times per second

Design

DCS is based on DeltaV by Emerson Process Management.