Chemical apparatus and process disinfecting – deodorizing – preser – Chemical reactor – Waste gas purifier
Patent
1991-08-16
1993-07-20
Warden, Robert J.
Chemical apparatus and process disinfecting, deodorizing, preser
Chemical reactor
Waste gas purifier
55 5, 55106, 422109, 422111, 4232155, B01D 5330
Patent
active
052290778
ABSTRACT:
A system is provided for maintaining the concentration of sulfur oxides in a flue duct (60) at a predetermined value. The sulfur oxides being maintained at a concentration to substantially optimize the particulate removal performance of an electrostatic precipitator (70). The sulfur rate control system (100) injects sulfur trioxide into the flue gas in proportion to a deficiency in the content of sulfur oxides in the flue gas, with respect to the proportion to particulates being carried by the flue gas. The sulfur trioxide is formed in a catalytic converter (54) which is supplied with sulfur dioxide and oxygen from a reaction chamber (40). The formation of sulfur dioxide is controlled by metering the source of sulfur responsive to a signal provided from a ratio controller (64). Ratio controller (64) supplies an output signal proportional to the difference between a predetermined value based on the particulate flow rate measured by the flow transmitter (66) and the content of sulfur oxides of the flue gas measured by the analyzer (68). The output signal from the ratio controller (64) is coupled to a speed controller (38) having one output (37) for controlling the speed of the sulfur supplying pump (32), and a second output (34) for controlling the position of the damper valve (22), through the actuator (20) and controller (18). Speed controller (38) controls the temperature of the air supplied to the reaction chamber (40) by controlling the electric heater (26) through the driver (28) and temperature controller (30) responsive to a flow transmitter output (35).
REFERENCES:
patent: 4770674 (1988-09-01), Tellini et al.
patent: 4987839 (1991-01-01), Krigmont et al.
Mandelik, B. G. and Turner, W., "Selective Oxidation in Sulfuric and Nitric Acid Plants: Current Practices", Chemical Engineering, Apr. 25, 1977, pp. 123-130.
Bell Terry A.
Kleinfeldt Thomas E.
Mullendore Michael G.
Walker, Jr. Hamilton G.
Environmental Elements Corp.
Klein David I.
McMahon Timothy M.
Rosenberg Morton J.
Warden Robert J.
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