27
As fuel briquettes have an advantage over loose rice straw in terms of higher
volumetric calorific value, improved combustion characteristics, ease of use when
feeding the furnace, and uniformity in size and shape. A rice straw briquette has an
average length of 10 mm (Munder 2013) and a density of up to 0.97 g cm
−3
, which
is 48 times the density of loose rice straw.
2.5.3 Pelletizing
Pellets (Fig. 2.14) are produced based on the principle of compressing ground straw.
As shown in Fig. 2.15, the compression unit is composed of a horizontal or vertical
ring die and rollers that put pressure on the inner surface of the ring die. During the
pelletizing process, the ring die and rollers rotate and the raw materials fall in the
Fig. 2.13 Schematic diagram of the pressing unit
Fig. 2.14 Rice straw
pellets
2 Mechanized Collection and Densification of Rice Straw
As fuel briquettes have an advantage over loose rice straw in terms of higher
volumetric calorific value, improved combustion characteristics, ease of use when
feeding the furnace, and uniformity in size and shape. A rice straw briquette has an
average length of 10 mm (Munder 2013) and a density of up to 0.97 g cm
−3
, which
is 48 times the density of loose rice straw.
2.5.3 Pelletizing
Pellets (Fig. 2.14) are produced based on the principle of compressing ground straw.
As shown in Fig. 2.15, the compression unit is composed of a horizontal or vertical
ring die and rollers that put pressure on the inner surface of the ring die. During the
pelletizing process, the ring die and rollers rotate and the raw materials fall in the
Fig. 2.13 Schematic diagram of the pressing unit
Fig. 2.14 Rice straw
pellets
2 Mechanized Collection and Densification of Rice Straw