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Preparations before igniting the heating furnace: (1) The furnace wall and flue construction are completed and have passed inspection. (2) The convection tubes, radiation tubes, and water injection pipes shall pass the pressure testing as specified. (3) The gas pipeline and burner have passed the purging and pressure testing, and the fuel oil circuit remains in normal operation. The flame arrester has been installed, and the burner gas valve is closed. The primary air damper at the blower outlet is adjusted to around 50% position, while all the secondary air dampers at the burners are closed completely. (4) The furnace tubes and furnace chamber should be thoroughly purged, and the area around the heating furnace should be cleaned. (5) Adjust the opening of the flue dampers to about 1/3–2/3, and close the access hatch, viewing port, and explosion-proof door of the heating furnace. (6) Prepare the diesel for ignition and the ignition rod. (7) Complete fire-fighting facilities. (8) The heating coil of the gas liquid separation tank is activated, and gas heating is put into use. (9) Lead the gas to the liquid separation tank and to the high-point discharge of the heating furnace to enhance condensate removal. (10) Steam is used to drive gas out of the furnace. (11) The associated instruments, vacuum gauges, and pressure gauges have been installed and calibrated. (12) Check the air preheating system to ensure it is functioning properly. Learn* and share.