Production
and utilization of producer gas from mixed plastic wastes
were investigated in a pilot-scale moving-grate gasification process.
A 500 kWth moving-grate gasifier was developed, including
a flame-assisted tar reformer and sequential gas cleaning processes
comprising a gas cooler, bag filter, and wet scrubber. The cleaned
producer gas, composed mainly of hydrogen, carbon monoxide, carbon
dioxide, and methane, was used in a 30 kWe gas engine to
generate power. Optimal operating conditions of the integrated system
were investigated for various parameters. As a result, producer gas
with a higher heating value of greater than 10 MJ/(N m3) and a cold gas efficiency of more than 55% was obtained under oxygen-blown
conditions. Due to the flame-assisted tar reforming with oxy-combustion
of natural gas, the hydrogen content was significantly increased,
resulting in an increase in the syngas caloric value and a decrease
in the gas cleaning load downstream. In addition, the performance
of the syngas power generation engine was tested with the slipstream
of the producer gas. A power output of greater than 20 kWe and a power generation efficiency of about 22% were obtained.
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