Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Sulfur or sulfur containing component
Patent
1988-06-13
1990-02-13
Heller, Gregory A.
Chemistry of inorganic compounds
Modifying or removing component of normally gaseous mixture
Sulfur or sulfur containing component
423512A, G01B 1700
Patent
active
049005243
ABSTRACT:
To prevent the formation of encrustations on a pH sensor in a combustion exhaust or flue gas washing apparatus, alkaline additives are added to the wash water which, upon contacting SO.sub.2 in the gases, form sulfite particles. The sulfite particles are prevented from depositing at the bottom of a collection vessel (11) in form of a mud, and, in accordance with the invention, rather are continuously stirred and recirculated in a closed recirculation loop to a spray device (25). The particles, upon being recirculated, will grow to form a granulate which, eventually, will deposit, the granulate, however, being constituted by granules substantially in excess of those which form a mud; the larger granules also prevent deposition of encrustations along the walls, and, for example, a pH sensor (47). The washing liquid within the tank or vessel 11 can be held in continuous turbulence or agitated form by a stirrer (53) coupled for example to the shaft of an immersion pump (21), an additional stirrer, by a recirculating fluid injection nozzle (57) or by directing run-off sprayed water into the tank by a direction and collection vane (28). Preferably, oxygen is excluded from the gases to prevent the formation of sulfates, and the washing liquid is held at a temperature below 40.degree. C. by a suitable heat exchanger which can supply hot utility water. A preferred pH is between 6 to 6.5.
REFERENCES:
patent: 2090143 (1937-08-01), Nonhebel et al.
patent: 4618482 (1986-10-01), Shinoita et al.
patent: 4686940 (1985-07-01), Fullemann
Technische Rundschau Sulzer (Technical Review Sulzer), Jan., 1987, pg. 22, Article by Gage et al., "Rauchgasent-Schwefelung, Recyclingverfabren" (Flue GAs Desulfurization According to the Attisholz-Sulzer Recycling Process).
Article in the Swiss Technological University Catalog No. B 18 655; 1979/2, "Contribution to Environmental Protection, Food Matters and Veternary Administration", Fed. Ministry for Heath and Environmental Protection), pp. 14-19.
Heller Gregory A.
VTH AG Verfahrenstechnik fur Heizung
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