| 摘要 |
PROBLEM TO BE SOLVED: To produce substantially spherical microparticles from a raw material such as a petroleum refinery residual oil which is usually solid at an ambient temperature and is capable of being liquefied at an elevated temperature. SOLUTION: The pelletizer has an upright pelletizing vessel 36 with an upper prilling zone, a sphere-forming zone below the prilling zone, a cooling zone below the sphere-forming zone, a bath below the cooling zone, and a prilling head being rotatable along a vertical axis and having a plurality of discharge orifices for throwing molten material radially outwardly and is provided with a plurality of nozzles 60 for spraying water inwardly into the cooling zone to cool the liquid pellets to be collected in the bath. The prilling head assembly for use in the pelletizer has a feed inlet to allow the introduction of a residual oil material, a rotary union joint with a fluid-tight seal, a rotatable pipe to convey the material to the prilling head, a drive wheel to provide rotation to the pipe, a support housing having a mounting means for attachment to the pelletizing vessel 36, and a prilling head with a flow passage in fluid communication with the orifices.
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