| 摘要 |
<P>PROBLEM TO BE SOLVED: To economically and safely thaw a liquid reducing agent frozen in a tank. <P>SOLUTION: The tank 2 is partitioned in three layers arranged in series, by two partition walls 1. Fuel is stored in one of the layers located outside, a urea water solution used in an NOx reduction catalyst 7 is stored in the other, and an antifreezing solution is stored in the middle layer. Return piping 14 for returning excess fuel from a fuel injection device 12 for pressurizing fuel to directly inject it into a combustion chamber of an engine 5, is allowed to pass through the inside of a heat medium storage part 2c, and a heat exchanger pipe 15 for performing heat exchange between the excess fuel and the antifreezing solution is interposed at the part located in the heat medium storage part 2c, of the return piping 14. The urea water solution in a reducing agent storage part 2b can thereby be indirectly heated using the excess fuel of high temperature from the fuel injection device 12. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
