Metallurgical apparatus – Process
Patent
1990-10-10
1992-11-17
Dean, R.
Metallurgical apparatus
Process
266251, 266252, 266262, 432124, 432138, C21D 900
Patent
active
051641453
ABSTRACT:
A rotary oil seal gas purge system for a rotary carburizing furnace, having a rotatable hearth in a furnace chamber containing a high carbon-potential furnace atmosphere comprising an endothermic carrier gas enriched with a hydrocarbon gas, features gas purge ports located adjacent to the oil seal(s) of the hearth for injecting non-carbon-enriched endothermic gas to purge the high carbon-potential furnace atmosphere from the area adjacent the seal(s) and prevent carbon precipitation into the seal(s). Also disclosed is an oil seal management system for a rotary carburizing furnace including a settling tank for accepting seal oil from the furnace oil seal(s), a pump supply tank for receiving oil from the settling tank, a pump for pumping oil from the pump supply tank through a heat exchanger and to the furnace oil seal(s), and a centrifuge for cleaning seal oil coming from the heat exchanger before returning it to the pump supply tank.
REFERENCES:
patent: 4288062 (1981-09-01), Gupta et al.
patent: 4763880 (1988-08-01), Smith et al.
patent: 4869730 (1989-09-01), Bhatnagar et al.
Dean R.
Phipps Margery S.
Thermo Process Systems Inc.
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