Process control system

Details Process control system Process control system

1974-02-11

1976-03-23

Satterfield, Walter R.

Chemistry: electrical and wave energy

Processes and products

Vacuum arc discharge coating

23254E, 23255E, 423574R, G01N 3616

Patent

active

039459047

ABSTRACT:
An improved and modified Claus process control system utilizing first and second coulometric titrators for automatically controlling the amount of oxygen used in burning a portion of the hydrogen sulfide (H.sub.2 S) in flue gases. The first and second titrators are fed sulfur dioxide (SO.sub.2) and H.sub.2 S scrubbed samples, respectively, of the flue gases downstream of the oxygen injection point. The first and second titrators produce H.sub.2 S and SO.sub.2 analog output signals, respectively, which are used to control the rate of flow of oxygen or air injected in a manner such that the samples of the flue gases contain H.sub.2 S in a concentration which is approximately or exactly equal to twice the concentration of the SO.sub.2 therein.

REFERENCES:
patent: 2200529 (1940-05-01), Baehr et al.
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patent: 3026184 (1962-03-01), Karasek
patent: 3219415 (1965-11-01), Hensley
patent: 3448031 (1969-06-01), Robinson
patent: 3692480 (1972-09-01), Snoek et al.
patent: 3812243 (1974-05-01), Landrum et al.
patent: 3822341 (1974-07-01), Smith
patent: 3854884 (1974-12-01), Robinson

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