| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an exhaust emission control device having a structure dispersing liquid reducing agent in exhaust gas nicely and evenly. <P>SOLUTION: In the exhaust emission control device injecting liquid reducing agent from a nozzle 4 into exhaust gas before the catalyst, a pressurizing means 20 exposing liquid reducing agent sent from a tank 10 to gas of higher pressure than atmospheric pressure before an injection quantity control valve 5 adjusting injection quantity from the nozzle 4. The pressurizing means 20 is provided with a compressor 21 compressing gas, a high pressure tank 22 storing high pressure gas after compression, and a pressure feed pump 23 sending liquid reducing agent in the high pressure tank 22. More gas is dissolved in liquid reducing agent under higher pressure, quick deposition of dissolved gas due to pressure drop and temperature rise is formed at a time of injection into exhaust gas, and atomization of liquid reducing agent is promoted by expansion force and liquid reducing agent is evenly dispersed in exhaust gas. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
