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A city natural gas storage station control system is presented in this paper. It consists of a Station Control Center, a process control station used Rockwell PLC, two desiccators control station used Ormon PLC, three high pressure compressors control station used Siemens PLC, Ethernet communication between supervise control computer and Rockwell PLC, RS 485 communication among the Siemens and Ormon...
The steam and water system of boiler is always divided into a drum level control system and a main steam temperature control system independently. The coupling is existed actually between these two loops, but it is often ignored by engineer or system designer. In this paper, the coupling between the drum level control system and the main steam temperature control system is determined by the controlled...
In the converter steelmaking vaporized cooling process, the serious ldquofalse water levelrdquo phenomenon appears at the drum water level of waste heat recovery boiler as the gas is burnt completely. According to the energy conversation law, a steam flow feed-forward compensator is designed as the open-loop controller to improve the previous control system. It is used to overcome the great nonlinearity...
The furnace combustion system of circulating fluidized bed boiler (CFBB) must ensure the steam pressure as a constant via controlling the coal quantity and wind flow. Another important role is to avoid the temperature varying excessively which will result in the high temperature agglomeration or low temperature agglomeration in boiler. Based on the model and characteristic analysis of combustion system,...
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