Method for removing contaminants from exhaust gases
First Claim
1. A method for the partial removal of contaminants from a process gas stream comprising the steps of:
- separating a process gas stream into at least two process gas streams,feeding ozone into contact with at least one of the separated process gas streams to oxidize the contaminants in the gas stream, andfeeding at least one of the process gas streams contacted by ozone to a scrubber for removal of the oxidized contaminants from the gas streams.
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Abstract
In a method for removing a portion of contaminants, such as nitrogen oxides, from an exhaust gas stream of a combustion process, the exhaust gas stream is separated into two or more gas streams. At least one of the two or more gas streams is treated first by mixing with ozone. The treated gas stream is then fed to a scrubber where it is recombined with the untreated gas stream. Excess ozone present in the treated gas stream is consumed by oxidation of contaminants in the untreated gas stream before the combined gas stream is released to the atmosphere. The portion of the gas stream separated for mixing with ozone directly correlates to the amount of nitrogen oxides that are desired to be removed from the stream.
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Citations
21 Claims
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1. A method for the partial removal of contaminants from a process gas stream comprising the steps of:
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separating a process gas stream into at least two process gas streams, feeding ozone into contact with at least one of the separated process gas streams to oxidize the contaminants in the gas stream, and feeding at least one of the process gas streams contacted by ozone to a scrubber for removal of the oxidized contaminants from the gas streams. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for the partial removal of contaminants from a process gas stream comprising the steps of:
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conditioning the process gas stream emitted from a combustion process, separating the process gas stream into at least two process gas streams, injecting ozone into at least one of the separated process gas streams to provide mixing of the ozone with the contaminants including nitrogen oxides in the separated process gas stream, oxidizing nitrogen oxides in the separated process gas stream by mixing with ozone, capturing the oxidized nitrogen oxides in a capture device to remove the nitrogen oxides from the separated process gas stream, and recombining the separated process gas stream substantially free of nitrogen oxides with the remainder of process gas stream containing contaminants. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. Apparatus for the partial removal of contaminants from a process gas stream comprising,
a duct for conveying a process gas stream from the exhaust of a combustion process, a scrubber connected to said duct for receiving the process gas stream containing contaminants, a source of ozone introduced into a first zone of the process gas stream in said scrubber for selective mixing with the process gas stream and a second zone of the process gas stream in said scrubber being free of ozone, and the ozone mixed with the process gas stream in said first zone oxidizes the nitrogen oxides present in the process gas stream first zone.
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21. A method for the partial removal of contaminants from a process gas stream comprising the steps of:
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conditioning the process gas stream emitted from a combustion process, injecting ozone into a portion of process gas stream to provide mixing of the ozone with the contaminants including nitrogen oxides in the selected portion of the process gas stream, oxidizing nitrogen oxides in the selected portion of the process gas stream by mixing with ozone, capturing the oxidized nitrogen oxides in a capture device to remove the nitrogen oxides from the selected portion of the process gas stream, and recombining the selected portion of the process gas stream with the remainder of process gas stream containing contaminants.
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Specification