| 摘要 |
<p>PROBLEM TO BE SOLVED: To stably maintain injection of an ammonia by conforming to a distribution state of a SOx amount by a method wherein an injection tube is made of a duplex tube wherein an air passage is formed by sectioning between an outer tube and an inner tube, a tapered cylindrical part is arranged to duct jet opening side of a nozzle, and ammonia and compressed air are circulated. SOLUTION: Ammonia 30 passes through an ammonia passage 18 in an inner tube 11 of a nozzle 7 wherein many nozzles are disposed in a row per each injection tube, and flows into an inner channel 17 of a cylindrical part 13. Besides, compressed air flows into an air passage 12 of the nozzle 7, stored in an air room 16 through an air hole of a partition wall 21 and thereafter, ejected into an ammonia flow at an inlet end of the inner channel 17 from a ring-like slit 15. Then, an outer layer of the ammonia flow 30 becomes a whirling flow of little turbulence and ejected into an exhaust gas from a jet opening 13a. Since a jet of the ammonia 30 and the air forms a stable jet stream therefore, the ammonia 30 can be avoided from being reacted by direct contact with SO3 in the exhaust gas.</p> |
