Double-helix pneumatic nebulized micro-oil igniting and flame stabilizing device

Abstract

The invention relates to a double-helix pneumatic nebulized micro-oil igniting and flame stabilizing device, which comprises a bumping coal dust concentrated and fractional combustion pulverized coal burner and a double-helix pneumatic nebulization micro-oil gun. Concentration of micro-oil employs a form combining bumping concentrating block and concentrating loop; a combustion chamber of the device comprises a combination of an inner combustion chamber and an outer combustion chamber; the bumping concentrating block is an annular lug boss with a triangular section; the bumping concentrating loop is an tapered circle structure; the inner combustion chamber and the outer combustion chamber are concentric and symmetric structures of different inner diameters .The double-helix pneumatic nebulized micro-oil gun and the pulverized coal burner employ a concentric assembly structure. 4 inner atomizing gas channels of the fuel nozzle of the micro-oil gun are spirally formed; 4 outer atomizinggas channels of the middle nozzle are also spirally formed; rotation directions of the inner atomizing channels are the same as rotation directions of the outer atomizing channels. The device of the invention is mainly applicable to start-up igniting and under-load flame stabilizing stages of pulverized coal fired boiler, thereby replacing presently used large-oil-gun igniting and flame stabilizing method. The method use coal to replace oil, so as to reach the goal of cost saving.

Description

Double helix pneumatic atomization micro-oil ignition and stable combustion device technical field The invention relates to a double-helix pneumatic atomized micro-oil ignition and stable combustion device, which is mainly used in the cold or hot start-up ignition and low-load stable combustion stages of pulverized coal boilers, and can also be used in cement, ceramics, metallurgy, etc. Industries that use pulverized coal as the main energy source. The new device has strong adaptability to coal powder, and can ignite coal powder of various coal types such as lignite, bituminous coal, lean coal, anthracite, mixed coal, etc., and belongs to the technical field of thermal power. Background technique With the continuous increase of international and domestic fuel prices and the continuous expansion of electric power and heating units, the oil consumption of various pulverized coal boilers in the electric power, petrochemical and other industries has increased significantly for...

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Problems solved by technology

As early as the 1970s, American G-E Company, B-W Company, Westinghouse Company, the former Soviet Union, Australia and other companies, as well as China's Tsinghua University, Harbin Boiler Factory, Wuhan Boiler Factory and other units conducted research on plasma oil-free ignition technology, especially from At the beginning of this century, Yantai Longyuan Electric Power Technology Co., Ltd. and Luoyang Bonnet Engineering Technology Co., Ltd. made use of the high fuel prices in recent years to promote plasma oil-free ignition. The decline in the coal quality of the unit has caused some problems in the application of plasma oil-free ignition, mainly for coal types with relatively low volatile content such as lean coal and anthracite, in the process of ignition and stable combustion, ignition failure occurs Based on the problem of unstable combustion, in recent years, China has begun to conduct research on micro-oil ignition technology, replacing the thermal power of the plasma spray gun with the thermal power generated by the combustion of micro-oil guns, and greatly improving the ignition efficiency. The thermal power of the heat source is improved, so that the ignition range of pulverized coal can cover pulverized coal of various coal types including lignite, bituminous coal, lean coal, anthracite, mixed coal, etc. The incomplete combustion of the gun has not fundamentally solved the problems of unsuccessful ignition and unstable combustion. The present invention will adopt multi-stage concentration and staged combustion of pulverized coal burners and double-helix pneumatic atomization, complete combustion, high efficiency and long service life. The combination of long micro-oil guns fundamentally solves the problems of unsuccessful ignition and unstable combustion

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