Let’s talk about what controls are good for gas furnaces in coal chemical companies (DCS, PLC, microcontroller)
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Our company uses a single-chip microcomputer to control the gas furnace process, which is separate from the instrument. Can you tell me what is the popular trend now?
Of course, it would be best if DCS unified control can be achieved!
Our unit's intermittent fixed-bed gas generator is controlled by PLC, and each furnace uses one PLC to reduce risks. PLC is more suitable for this process. For Lurgi furnace, shell, Texaco and other furnaces, DCS+ESD control is more suitable.
supcon ECS-100 is used more often
PLC is relatively good for fixed bed gasifiers, and Siemens S7-200 is commonly used.； Other large gasifiers use DCS+ESD
dcs+esd has low risk but high cost
It’s better to have unified management by DCS!
It depends on what brand of stove it is, how many points there are in the gas generator, and the safety performance requirements, such as the shell. It is far from enough to use DCS+ESD control instead of PLC.
Our company's five large gas furnaces (Lucci furnaces) are controlled by DCS； The 32 fixed-bed gasification furnaces in the later renovation project are controlled by Siemens S7-200PLC (one PLC for each furnace) ； The public parts (waste heat recovery, blower air recovery, coal drum electrostatic precipitator and other devices are controlled by a set of DCS (PCS7).
If DCS is used, the analog control effect is good, and the digital control of PLC is better. The price of DCS is relatively high.