| 摘要 |
PROBLEM TO BE SOLVED: To avoid a situation that the temperature of urea water in a urea water tank is raised even in the composition in which urea water is made to flow back from a urea water supply valve.SOLUTION: A denitrification apparatus 200 includes: a denitrification catalyst 210 for promoting the reduction of nitrogen oxide in exhaust gas from an engine 110; a first reducing agent storage part 212 for storing reducing agent; a reducing agent supply part 214 which is provided, on the upstream side of the denitrification catalyst and in an exhaust passage of the engine, to supply the reducing agent; a reducing agent collection part 216 for collecting the supplied reducing agent; a second reducing agent storage part 218 which is disposed between the first reducing agent storage part and the reducing agent supply part, and communicated with the first reducing agent storage part and the reducing agent supply part, respectively, and stores the reducing agent supplied from the first reducing agent storage part and fed out to the reducing agent supply part, and also stores the reducing agent collected by the reducing agent collection part; and a heat exchange part 228 for radiating the heat of the second reducing agent storage part. |
