In practical application of the plasma burners for once-through boiler of one supercritical 700 MW unit

problem of arc interruption is existing

leading to overtemperature of burners and heating surface in said boiler.For this

some measures

such as adjusting parameters of plasma

increasing feed-water flow rate before ignition

improving start-up and operation mode of the combustion system

etc.have been put forward.After implementation

fuel oil used for ignition and combustion stabilization has been remarkably reduced

overtemperature of tube-wall on the heating surface has never occurred

and the electrostatic precipitator and desulphurization facility of the boiler can be put into service at initial time of ignition

avoiding problem of large quantity emission of SO2 and NOx due to fuel oil can't be timely injected

having substantial economic and social benefits.