The invention discloses a
waste gas-fuel reforming and recycling
natural gas engine
system and a control method. The
waste gas-fuel reforming and recycling
natural gas engine
system comprises an engine, a
fuel supply device, a gas tank used for supplying to the
fuel supply device, a reformer and an
intercooler. Engine fuel is directly subjected to a multiple reforming reaction with O2 and
water vapor, so that reformed gas which is rich in H2 and CO is generated, and H2 production efficiency is high; online production of
hydrogen is achieved, an extra
fuel storage device or an extra
hydrogen storage tank does not need to be provided, the safety is improved, and the size of the whole
system is reduced; two pass tubes are adopted, so that the
heat transfer coefficient is increased, and the reforming efficiency is improved accordingly; the reformed gas contains a large quantity of H2, the in-cylinder
combustion speed is increased, and the lean burning extreme is widened; the
oxygen concentration in a gas inlet
pipe can be decreased through circulating
waste gas, the
specific heat capacity of working media is improved, and the in-cylinder
combustion temperature is decreased; and by combining the reformed gas with the circulating waste gas, stable low-temperature lean burning of the
natural gas engine can be achieved, and meanwhile, the HC concentration, the CO concentration and the
NOx concentration can be decreased.