The Thermochemical Conversion of Biomass into High-Value Products: Microwave Pyrolysis - The Economic Utilisation of Food Co-Products - page 56

Table 3.5 Mass balance comparison of conventional and microwave pyrolysis
of wheat straw. 44

Yields (mass%)
Conventional Products MW 1000 W MW, 1200W 3% HCl

d n 9 r 3 n g | 8

Char 31.9 29 31.8

Organics 24.9 20.6 22.1

Water 25.7 36.4 27.1

Gas 15.6 14 19

3 .

Figure 3.6 Temperature profile of barley dust in an open vessel microwave using
differing testing methods.

Figure 3.7 Temperature measuring devices within a microwave cavity.

product and these gaseous products distribute the heat more evenly through
the sample. The fibre-optic measurements are alternating above and below the IR
trend due to the response lag of the method. The fibre-optic probe is held within a
glass guide tube that leads to a delay in heat transfer to the probe (Figure 3.7).