Furnaces – With control means responsive to a sensed condition – Feed control
Patent
1986-07-03
1988-06-21
Warner, Steven E.
Furnaces
With control means responsive to a sensed condition
Feed control
110191, 110193, 110210, 110215, 110236, 432 37, 432 38, 432 72, F23N 502
Patent
active
047518863
ABSTRACT:
A batch-type pyrolysis furnace fired by a main heat source such as a gas burner or an electric heating coil in combination with an afterburner to burn volatiles generated in the furnace's main chamber, is operated to incinerate high-polymer loads smokelessy, yet is effectively safeguarded from explosions. A single thermocouple (throat TC) senses the instantaneous temperature in the throat of the furnace and in cooperation with a programmable controller, maintains a preselected ramp and soak temperature profile over the entire burn cycle. When the temperature required by the profile is exceeded, a single water spray actuated by a signal from the PC lowers the temperature below the profile. The throat TC thus maintains a fire under controlled temperature conditions in the main chamber without an explosion, using a single-stage system. This single-stage control system, for additional safety and redundancy, may include two back-up thermocouples, one in the main chamber (main chamber TC), and, a second (stack TC) in the exhaust stack downstream of the afterburner. The main chamber TC senses the ambient, essentially instantaneous temperature at that location, and actuates the water spray system. The main chamber TC and the stack TC may each also attenuate the output of the main burner and control its on/off operation.
REFERENCES:
patent: 3705711 (1972-12-01), Seelandt et al.
patent: 3767179 (1973-10-01), Larson
patent: 3839086 (1974-10-01), Larson
patent: 4270898 (1981-06-01), Kelly
patent: 4309949 (1982-01-01), Rastogi
patent: 4557203 (1985-12-01), Mainord
patent: 4649834 (1987-03-01), Heran et al.
Heran Robert F.
Koptis Robert A.
Lobo Alfred D.
Warner Steven E.
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