Issue regarding the startup sequence of the induced draft fan and blower in the heating furnace of the atmospheric and vacuum distillation unit
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In a atmospheric and vacuum distillation unit, there are an atmospheric furnace and a vacuum furnace. These two heating furnaces do not have dampers. So, during normal operation, what is the sequence in which the pilot gas for the heating furnaces, the main fuel gas, as well as the blower and exhaust fan are started? Urgently needed, please explain the reason. Thank you very much
Startup sequence: induced draft fan, blower, pilot gas, main gas. The exhaust fan is primarily used to overcome the frictional losses along the flow path, so as to allow the flue gas to be discharged smoothly (a exhaust fan may not be necessary when the resistance in the flue gas system is low). A blower forces air in for combustion with natural gas. Check the gas for the everlasting light to determine whether the combustion conditions are met. Main gas, used for operational production.