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US 4,256,721 AGranted
Combustion method and apparatus
AssigneeBOC Limited
InventorsPhilip G. Blakey, Richard W. Watson
Life of this patent
Estimating the term…
Abstract
In a process for thermally cracking waste sulphuric acid, a combustible material is mixed with such acid and the mixture is supplied to a burner to which a flow of atomizing air is also supplied. A flow of secondary air which is enriched to about 23-40% by volume of oxygen is injected into a flame generated by burning said waste sulphuric acid-combustible material mixture to thereby thermally crack such acid while reducing the production of by-product sulphur trioxide.
Claims4
A process of thermally cracking waste sulphuric acid to produce sulphur dioxide comprising
- (a) supplying a stream of waste sulphuric acid to a first passage of a burner in communication with a combustion chamber, the sulphuric acid having dissolved therein or mixed therewith combustible matter;
- (b) supplying a stream of atomising air to a second passage in the burner so as to atomise the sulphuric acid and combustible matter;
- (c) supplying a stream of secondary air to the combustion chamber separately from the burner so as to provide an oxygen containing atmosphere in the vicinity of the flame issuing from the burner in operation of the burner;
- (d) initiating combustion of the combustible matter so as to generate the heat necessary for said thermal cracking;
- the improvement comprising
- (e) injecting oxygen or an oxygen gas mixture containing at least 35% oxygen by volume into the combustion chamber separately from the burner and into direct contact with a flame issuing from the burner in operation of the burner.
3 more elements
Dependencies are inferred from the claim text.