The invention discloses a cold-state starting method for a
coal-fired unit without an auxiliary steam source, relates to the technical field of
coal-fired units, meets the requirement of ignition of a
coal mill on the outlet temperature of a separator by utilizing a tiny-oil ignition device mounted in a hot primary air duct of a boiler, and solves the problem that steam
soot blowing of an air pre-heater cannot be carried out without steam. And after the unit is ignited and started, the self-produced steam is used for recovering the auxiliary steam and normal steam use of the shaft seal
system, so that double self-supply steam is formed, the
quick start of the unit is realized, and the shaft seal throwing and vacuumizing operation of the
steam turbine is performed step by step. And when the hot primary
air temperature gradually rises, the tiny-oil ignition device is quitted, and after the unit impulse rotation condition is met,
steam turbine impulse rotation and generator
grid connection are carried out. By adopting the embodiment of the invention, the method can be suitable for full-cold-state starting of the coal-fired unit under the conditions of no starting boiler, no boiler
oil burner, no matched
fuel oil tank and no imminent
machine auxiliary steam, the starting time can be effectively shortened, and the starting cost is saved.