| 摘要 |
PROBLEM TO BE SOLVED: To provide an additive agent supply structure capable of efficiently cooling an additive agent spray nozzle with a comparatively simple configuration without increasing an amount of consumption of additive agent.SOLUTION: This invention relates to an additive agent supply structure for supplying urea water 5 acting as additive agent in exhaust gas of a diesel engine 60. The structure comprises: urea water spray nozzle 21 having a supply port 21a for supplying urea water 5 to exhaust gas 1; a holder 22 for holding urea water spray nozzle 21 and fixed to an exhaust pipe 11 where exhaust gas 1 flows; a washing liquid supply device 30 for supplying washing liquid 6 to the holder 22. The holder 22 comprises: a washing liquid chamber 22e formed into a shape covering urea water spray nozzle 21, the washing liquid 6 supplied by the washing liquid supplying device 30 being fed into the washing liquid chamber 22e; and a washing liquid flowing passage 22f connected to the washing liquid chamber 22e and opened near the supply port 21a of urea water spray nozzle 21. |
