| 摘要 |
<p>This exhaust purification device is configured containing: an SCR converter that receives a supply of ammonia generated from an aqueous solution of urea and selectively reduces/purifies NOx in exhaust gas; and an injection nozzle that supplies/injects the aqueous solution of urea upstream of the exhaust of the SCR converter. Also, at least a portion of the exhaust tube positioned between the injection nozzle and the SCR converter has a double-walled tube structure comprising an outer tube and an inner tube, and of the two ends of the inner tube and outer tube, at least the ends positioned at the upstream end of the exhaust are welded together across the entire circumference with a flange therebetween. Also, the exhaust to which the aqueous solution of urea has been admixed is caused to not enter between the inner tube and the outer tube, and by causing it to be difficult for urea-derived deposits to be deposited at the inner peripheral surface of the outer tube, the occurrence of corrosion of the outer tube is suppressed.</p> |
