with the increasing percentage of natural gas in the fuel mix. The
gap between this cleaning system with and without vent gas
treatment also declines slightly with the growing proportion of
natural gas.
When analyzing these remanufacturing cleaning separately, it
can be found that the environmental performance ranking is high
temperature decomposition, SCCO2 cleaning, shot blasting, liquid
blasting cleaning with the comprehensive environmental scores of
3.31 103, 2.69 104, 6.53 105, 7.09 105, respectively. As
for the former two cleaning method, the environmental impact is
primarily determined by their energy usage which mainly depends
on diesel, natural gas and electricity, respectively. Thus, using the
environmental friendly fuels or cleaner energy sources is still the
alternative way to assuage environmental issues. On the other
hand, from a technical perspective of cleaning, finding out the
optimized minimum cleaning time and ensuring the required
cleanliness of parts is another essential way to save energy use.