The invention relates to a
mixed gas filling device and a
mixed gas filling method of CNG and HCNG. The device comprises a pre-
processing system, a mixed pressure raising
system and a filling and storing
system, wherein the pre-
processing system is connected with the mixed pressure raising system and the filling and storing system and comprises a tube bundle CNG conveying trailer, a tube bundle
hydrogen conveying trailer, a CNG gas discharging column, a
hydrogen discharging column, a CNG purifier and a
hydrogen purifier; the mixed pressure raising system comprises a special
piston compressor unit for CNG, a special
diaphragm compressor unit for hydrogen and a
high pressure mixing device; the gas inlet of the special
piston compressor unit for CNG is connected with the gas outlet of the CNG purifier, and the gas outlet of the special
piston compressor unit for CNG is connected with the CNG gas inlet pipeline of the
high pressure mixing device; the gas inlet of the special
diaphragm compressor unit for hydrogen is connected with the gas outlet of the
hydrogen purifier, and the gas outlet of the special
diaphragm compressor unit for hydrogen is connected with a hydrogen inlet pipeline of the
high pressure mixing device; and an HCNG gas outlet pipeline of the high pressure mixing device is connected with the filling and storing system. The
mixed gas filling device and the mixed gas filling method provided by the invention can be widely applied to gas stations of HCNG automobiles and CNG automobiles.