| 摘要 |
PROBLEM TO BE SOLVED: To securely prevent freezing of a pressure reduction part by constantly securing heat exchange action between the pressure reduction part and a heat exchange medium in a fuel gas supply system, and achieve simplicity and low cost of the structure of a heat exchange part. SOLUTION: Compressed natural gas stored in a gas cylinder 1 is pressure-reduced at the pressure reduction part 2 to be fed to an engine 3 as fuel to drive a hydraulic pump 4 by the engine 3. To a heat exchange case 10 containing the pressure reduction part 2, operating fluid of a return oil line 7 coming from a hydraulic actuator 6 is sent, so that a heat exchanger 9 is composed to perform heat exchange action between operating fluid and the pressure reduction part 2. Freezing of the pressure reduction part 2 is thus prevented. COPYRIGHT: (C)2005,JPO&NCIPI
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