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Vortex combustion in paired fire tube furnace using a bypass channel

The boilers with a single cylindrical fire tube are limited in power output. Boilers of such design with a growth of capacity become very expensive to produce due to the large amounts of metal used. Increasing the capacity or power output of existing boilers makes possible not to increase the metal consumption. But unless making any changes to design it will cause a number of problems. Improvement of furnace aerodynamic characteristics could be the solution of these problems. As a solution new paired fire-tube furnace layout is proposed. Functional processes in the proposed combustion chamber were simulated by means of the proven simulation software ANSYS. The subjects of studying were: three-dimensional fields of velocity magnitude, temperature, path lines of aerodynamic flows, flame length and aperture angle, lengthwise pressure distribution. The numerical computation results display the vortex combustion processes within the paired fire tube furnace with a bypass channel. A uniform distribution of heat dissipation along the length of fire tube is observed. It is conducive to the reliable operation of the boiler, in particular, under the terms of Iimescale formation, and therefore makes possible boiler operation at lower costs for feed water treatment. Lower combustion temperatures also make possible to use cheaper materials for the heating surfaces and reduce thermal expansion.