Evaluation of Plastic Waste Management in Thailand Using Material ...

e-excavated Refuse because it does not require high purities of the feedstock and is able to
tolerate high amounts of contaminants. This unit has an efficiency of approx. 35 %. To
suppress corrosive material degradation from chlorine (PVC) of reaction chamber and
successive piping, the operation is done with a catalyst to trap respective contaminants.
The operational temperature lies around 480° C whereas LPG-gas has to be applied for the
start-up period until enough recirculated synthesis gas has formed, which is capable of
firing the two conventional gas-burner units (see Figure C-55). The synthesis gas consists
of CO2, CO, H2 and Hydrocarbons, where chains > C5, C6 are condensated and chains < C5
are recirculated back into the gas-burner system. The remaining vapors after condensation
are treated by gas scrubbing and released by a stack. The capacity of this unit lies around
10 000 l/day.
Figure C-55 Pyrolysis Unit 1 with two gas-burner
179
Figure C-56 Heat exchange
condensation columns from
Pyrolysis Unit 1
Unit 2: this unit is designed in the same way as the unit above and only differs in size of
the reaction chamber with measures of 1.5 x 1.5 x 6 m. The feedstock is biomass before
entering the combustion chamber and further conveyed and mixed by a conveyor screw.
The synthesis gas is fed into the rectification column as well.
Rectification
Figure C-57 Pyrolysis Unit 2
for biomass and its
condensation columns
The Rectification column is fed by the condensate of the two Pyrolysis units mentioned
above, it consists out of 6 stages that split the tar-oil into Naphtha, Diesel and four other