| 摘要 |
A gas re-circulation selective catalytic reduction system. A vaporizer is provided for producing a diluted reducing agent. A reducing agent source, for storing a reducing agent, has a reducing agent pipe interconnected to the vaporizer. A re-circulation gas pipe is adapted to carry gas from a gas flow to the vaporizer. A dilution fan may be provided for propelling the gas from the gas flow to the vaporizer. An injector, connected to the vaporizer by a diluted reducing agent pipe, injects the diluted reducing agent into the gas flow. A heat trace is coupled to the diluted reducing agent pipe and the injector for maintaining a predetermined temperature of the diluted reducing agent pipe and the injector sufficient to substantially prevent the formation of ammonium bisulfate within the insides of the diluted reducing agent pipe and the injector.
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