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134 Advances in Eco-Fuels for a Sustainable Environment

Fig. 5.5 The temperature profile for different pyrolysis mechanisms.

respectively. However, when compared with the electrical heating process, MAP with
susceptors with 1.1 and 2.2kW reaches its maximum in 40 and 30min, respectively.
The SiC susceptors have been used here for improving the process efficiency. It can be
observed that MAP with susceptors at 2.2kW is the fastest way to achieve maximum
temperature.

5.10.2 Specific energy consumption
Fig. 5.6 is drawn between the specific energy consumption of the pyrolysis process
and the temperature rise through the different heating mechanisms. For reaching
the same maximum temperature of 350°C, electrical heating takes 5040kJ/kg. When
compared to electrical heating, MAP without susceptors with 1.1 and 2.2kW will
require 7837 and 12,200kJ/kg of specific energy consumption, respectively. MAP
without susceptors will need 55% and 142% more of the specific power consumption
value compared to electrical pyrolysis. When compared to electrical pyrolysis, MAP
with silicon carbide susceptors in 1.1 and 2.2kW will require 3441 and 3112kJ/kg,
respectively, which is 32% and 38% less of the specific energy consumption value
of electrical heating. It can be observed that MAP with susceptors at 2.2kW has less
amount of specific energy consumption to achieve maximum temperature and also
that MAP without susceptors takes a significant amount of power per kg because
of the weak microwave-absorbing characteristics of the waste engine oil. The use