What is the optimal size for the wind cap holes?
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Let’s all discuss together the boiling furnace for zinc-oxidized concentrate with 14 squares; for the 796 air caps that have four holes each, what is the most suitable hole diameter?
The diameter of the air cap must be determined through detailed calculations; it has a direct impact on the opening rate and the boiling conditions. It is related to the size of the fan used, as well as the sulfur content in the ore. Based on personal experience, values between 5 and 6.5 work well
The zinc concentrate used by our company contains about 30% sulfur. The motor originally fitted with the fan in front of the furnace was of grade 8, with a rotation speed of over 780 revolutions per minute; the air intake volume was 160.5 cubic meters per minute. Later, since the air intake volume was not sufficient, a motor of grade 6 was installed, with a rotation speed of 960 revolutions per minute, resulting in an air intake volume of around 198 cubic meters per minute at present. The diameter of the air outlet openings in our system is 4.7 millimeters. The values of 5–6.5 you mentioned likely apply to furnaces with much larger surface areas
The gas velocity in the small holes of the zinc furnace air cap is generally between 25 and 40 meters per second. You can do the conversion yourself.