Plasma ignition technology
Introduction of Technologies
Plasma is the fourth form of matter beside liquid，solid and gas．It is neutral as a whole and rich inside with many active action, anion, electron and molecule. The core temperature of Plasma jet produced by plasma generator is up to 8000～10000℃ and forms a reasonable temperature field when combined with plasma burner so as to promote pyrolysis and combustion of coal powder. By taking advantage of this feature, plasma ignition and combustion stabilizing systems for pulverized coal-fired boiler has substituted fuel oil during boiler startup and combustion stabilization and realized fuel oil free startup of boiler as well as stable combustion.
The application of plasma ignition technology and realization of fuel oil free ignition at the initial stage of boiler ignition avoid air pollution problems caused by lack smoke when dust cleaning device cannot be used for fuel oil ignition. It is a good solution to this problem especially when the state is implementing regulations relating elimination of desulfurization bypass.
----Save high grade energy: substitute fuel oil with pulverized coal for startup and shutdown as well as during combustion stabilization of pulverized coal-fired boiler;
----Save operation cost: the operation cost only 10-20 % compared to that of fuel oil ignition during boiler startup and shutdown as well as combustion stabilization;
----Safety assurance: eliminate hidden danger of personal casualty and equipment failure to be caused by fuel oil burning;
----Benefit environment protection: ESP can be applied during plasma ignition so as avoid environment pollution by direct emissions of flue gas and dust.
Application and cases
For the past decade, Plasma Ignition and Combustion Stabilizing Technology has been developed and improved in practice. It has been widely recognized in the market. Up to Oct. 1st, 2012, Plasma Ignition and Combustion Stabilizing Technology has been successfully applied on 627 coal-fired units with a total capacity of over 265GW, of which 69 units are of 1000MW, 318 units are of 600MW, 120 units are of 300MW, 116 units are of 200MW. The total fuel-oil saved owing to the application of the technology is added up to 5 million tons with a cost-reduction as much as 25 billion RMB. The technology can be used for tangential-fired and wall-fired units with direct-flow burner or swirl burner and different pulverizing system, storage or direct-fired (major), burning different kinds of coal, such as bituminous coal and lignite. The coal mills including steel ball mill, middle-speed mill and double inlet & outlet mill. In a word, PICS is suitable for
the coal-fired units of different capacities, boiler types, combustion types and pulverizing types. Plasma Ignition and Combustion Stabilizing Technology has also been successfully applied in Korea, Russia, Turkey and Indonesia.