Research On Aerodynamic Field And Structure In Industry Boiler Furnace

In this paper, the problems in industrial boilers are analyzed, and it is found that there are two major technical problems, which are lower of the thermal efficiency and higher dust content, and also expounding measures of the thermal efficiency of industry boiler of burning coal and the reducing pollution.How to improve the thermal efficiency of industry boiler, how to further reducing the initial dust-emission density of the boiler?Beginning with industrial boiler configuration and aerodynamic field in this paper, the data is optimized with the Lagrange interpolation, which is measured by seven-hole probe in a DZL 1.4MW hot water boiler furnace on a variety of conditions. Comparing 3D drawings, which are drawn by 3D drawing MATLAB program, and also comparing the rotation degree, it will be get that while the original smoke-turning wall at firebox exportation is changed to left and the angle of the wall with the horizontal plane including is 28°～34°, the hearth is permeated best by smoke, and disturbance is the strongest, the trip of smoke in the hearth is the longest. These are conducive to the ash falling, the combustible ash burnout, and then is conducive to energy-saving and environmental protection.In test about the arch, by comparing the optimized test data and 3D drawing of the aerodynamic field and the rotation values, it is get that while the covering of the arch to the furnace raft is 67% of the area, burning II coal, the rear arch arc straight tilting -- that the rear is arc arch and the angle of horizontal and the front arch is 10 °, and also the while the height of the front arch exit is 710mm and the height of the rear arch is 450mm, there is the largest rotation value in the firebox, the strongest disturbance, the best mixed. These are conducive to the incandescence smoke in rear arch running to the front arch, are conducive to the new coal heating, drying and kindling, are conducive to the combustion of the combustible gases and reducing the content of carbon in residue, are conducive to reducing the loss of chemical incomplete combustion and the loss of mechanical incomplete combustion. At last, it is help to improving the thermal efficiency of industrial boilers.In the study of V-shaped furnace bottom, by optimizing the data of the aerodynamic field and calculating the rotation values, and also drawing the 3D graphics, it is get that while the bottom opening is 800mm～900mm, the convolution of smoke on rising is the strongest. At the same time, the combustible in fly ash on the furnace raft and the flying ash are blown up by the air, and burning and being blown up. When the combustion end basically, it is the time that the velocity of rising smoke slower. There is the largest velocity in the blaze center in firebox and the velocity of periphery is smaller, so they form circumfluence. It is conducive to falling of flying ash and the combustible of no-burnout flying ash, conducive to reducing smoke and ash, conducive to reducing the content of combustible in flying ash. For the content of flying ash and combustible in flying ash reducing in firebox, it is conducive to lightening the abrasion of rear heating part and extending the service life of industry boiler.The study concludes in this paper provides technology to the new product designing and the reconstructing of old industrial boiler. These will create a better economic and social benefits, and are conducive to improving the thermal efficiency of industrial boilers and conducive to reducing the initial dust-emission density. So, these have practical significance to energy-saving and environmental protection of industrial boilers.