Dresser Industries, Inc.

Dresser U.k. Ltd.

Michael J Ashley

Roy A Greaves

Paul D Hemphill

Charles C Leivo

In a process involving contacting a gas with a liquid whereby to cool and/or clean the gas, the liquid is sprayed into the gas by a rotary-cup atomizer or other 'air-assisted' atomizer in which the spray is produced by impacting a film of the liquid with a high pressure air stream. The atomizer has a low spray angle which is beneficial to ensuring good contact with the gas. The method is particularly applicable to processes where the liquid is an abrasive slurry or solution, as in a process of desulphurizing a hot flue gas by spray drying in a tower.

Gas/liquid contact processes

In a method of absorbing pollutant material e.g. sulphur dioxide from a polluted gas, an aqueous suspension of a solid absorbent e.g. calcium hydroxide is sprayed into the gas; and the ambient conditions in the gas are such that all the water is evaporated and the absorption product is dried as it is formed. The spray droplet size is controlled to be a practical maximum consistent with maintaining the ambient conditions. The spray droplet size may be so controlled that the arithmetical average spray droplet lifetime is at least 80% of the theoretical maximum spray droplet lifetime consistent with maintaining the ambient conditions.

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Solihull, United Kingdom

Michael J Ashley