Control of vertical heat treating vessels

Heating – Processes of heating or heater operation – Controlling flame position or work atmosphere

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432 36, 432 47, F27D 700, F27B 940

Patent

active

040024210

ABSTRACT:
Uniform heat treatment of particulate material of nonuniform gradation in a vertical heat treating vessel such as a vertical kiln or retort is affected by regulating the heat input to a heat treating zone in the vessel in response to changes in specific gravity of the mass of particles passing into the heat treating zone as detected by measurements such as differential pressure changes of combustion supporting fluid and process gas flowing into and from the heat treating zone to result in a balance between particulate mass flow and heat input and substantially uniformly heat treated particulate material. Furthermore, uniform oxygen conversion within a heat treating zone in a vertical heat treating vessel is maintained by measuring the oxygen content in the effluent gases passing from the gas outlet of the heat treating vessel and controlling the flow of air into the heat treating vessel in response to variations of the oxygen content in the effluent stream to maintain a constant oxygen content in the effluent gas stream.

REFERENCES:
patent: 2451024 (1948-10-01), Ellerbeck
patent: 2616678 (1952-11-01), Grossman
patent: 2814479 (1957-11-01), Leone
patent: 3119605 (1964-01-01), Berz
patent: 3185457 (1965-05-01), Boll et al.

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