Chemical apparatus and process disinfecting – deodorizing – preser – Control element responsive to a sensed operating condition – Control element responds proportionally to a variable signal...
Patent
1980-08-11
1982-08-10
Marcus, Michael S.
Chemical apparatus and process disinfecting, deodorizing, preser
Control element responsive to a sensed operating condition
Control element responds proportionally to a variable signal...
34 26, 34 32, 34 72, 34 54, 110210, 422111, 422115, 422169, 422180, G05D 2322, F01N 310, B01J 800
Patent
active
043437699
ABSTRACT:
Gas consisting of air mixed with varying concentrations of solvent vapors, drawn from a dryer, is passed through controllable heating means to a catalyst bed. In flow through the catalyst bed, for oxidation of the vapors, temperature rise of the gas depends upon solvent concentration. For control of the heating means, so that gas at the bed inlet will have a temperature high enough for complete vapor oxidation but not so high as to be unnecessarily hot at the bed outlet, thermocouples are located to sense gas temperature at the bed inlet and outlet. Like terminals of the thermocouples are connected to opposite ends of a potentiometer resistance element; its slider is connected with a comparison device that compares the potentiometer output (corresponding to a weighted average of bed inlet and outlet temperatures) with a demand value. The heating means consists of a controllable fuel burner and a heat exchanger wherein hot gas from the catalyst bed can heat gas flowing to the burner. Some, all, or none of the gas flowing to the burner can be controllably bypassed around the heat exchanger. A constant-volume fan is located between the blower and the catalyst bed inlet so that mass flow rate through it tends to increase with increasing vapor concentration.
REFERENCES:
patent: 3314159 (1967-04-01), Betz
patent: 3395972 (1968-08-01), Hardison
patent: 3486841 (1969-12-01), Betz
patent: 3806322 (1974-04-01), Tabak
Marcus Michael S.
Nilles James E.
W. R. Grace & Co.
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