Process for removing contaminants from gas streams
First Claim
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1. A method for removing contaminants from a waste gas stream in a sulfuric acid production process comprising the steps:
- a) directing said waste gas stream to a particulate scrubber;
b) contacting said waste gas stream with ozone;
c) scrubbing oxidized NOX in said particulate scrubber;
d) directing said waste gas stream to a gas dryer; and
e) recovering said waste gas stream.
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Accused Products
Abstract
The present invention provides for process for inhibiting the levels of nitrogen oxides in process gas streams from sulfuric acid regeneration and production plants. The process gas stream from the waste heat boiler and the candle mist eliminator is contacted with ozone which will react with nitrogen oxides present in the flue gas.
16 Citations
30 Claims
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1. A method for removing contaminants from a waste gas stream in a sulfuric acid production process comprising the steps:
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a) directing said waste gas stream to a particulate scrubber; b) contacting said waste gas stream with ozone; c) scrubbing oxidized NOX in said particulate scrubber; d) directing said waste gas stream to a gas dryer; and e) recovering said waste gas stream. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 15)
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14. The method as claimed 1 comprising washing said waste gas stream in said particulate scrubber.
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16. A method for producing sulfuric acid comprising the steps:
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a) recovering a gas stream from a sulfuric acid recovery furnace; b) directing said gas stream to a particulate scrubber; c) injecting ozone into said gas stream in said particulate scrubber; d) scrubbing oxidized NOX in said particulate scrubber; directing said scrubbed gas stream to a gas drying tower; f) directing said dried, scrubbed gas stream to a catalyst bed to convert sulfur dioxide present in said dried, scrubbed gas stream to sulfur trioxide; g) directing said gas stream containing sulfur trioxide to a sulfuric acid absorption tower; and h) recovering sulfuric acid. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 30)
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29. The method as claimed 16 comprising washing said waste gas stream in said particulate scrubber.
Specification