Study On The Plasma Ignition Enhancement In Swirling Burner Front And Back Wall Convection Coal Fired Boiler

The background of energy development of our country is the petroleum in shortage, this is also the practical reason for the thermal power plants to promote the no-petroleum ignition combustion technology in thermal power plant. This paper mainly studies the application status of plasma ignition, one of the no-petroleum ignition technologies, in front and back wall convection swirling burner boiler. Although at present many power plants have installed plasma ignition system in their generating units, it is the first time to make plasma ignition enhancement study in the coal fired boiler with the front and back wall convection of the coal mill with the minimum coal quantity of 30T/H, and each coal mill corresponding to eight swirling burners.This paper firstly analyse the possibility of applying the plasma ignition technology to swirling burner. Through calculation and test, the coal powder parameter is determined to satisfy the requirement of plasma ignition. Then study is made on how to enhance the previous swirling burner in order to satisfy the plasma ignition requirement. Calculation is made on the required fuel quantity for boiler cold start-up. Calculation is made on the first wind temperature required for the start-up of coal mill after the enhancement of load change. Considering from the safety and economy aspects, the quantity and distribution of burner are determined and the timing of input of plasma ignition is also determined. The ancillary systems of plasma ignition are also involved in this paper.