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Bagasse is often used as a primary fuel source for sugar mills. When burned in quantity, it produces sufficient heat energy to supply all the needs of a typical sugar mill, with energy to spare. To this end, a secondary use for this waste product is in cogeneration , the use of a fuel source to provide both heat energy, used in the mill, and electricity, which is typically sold on to the consumer electrical grid .
To begin with, the underfired type of boiler was extensively used for sugar mill work. This boiler was fired in much the same way as we see them fired nowadays, with woodshavings and sawdust at sawmills. No special attention was given to the design of the furnace or boiler setting. The bagasse was simply thrown on to the firebars, and burnt so long
A bagasse fired boiler equipped in a sugar mill is producing 80 MW of heat (steam power) at the operating efficiency of 62%. Combustion efficiency of the boiler is 92%. The composition of the bagasse on dry basis is: C = 48.1%; H2 = 6.25%; N2 = 0.1%; O2 = 44.4%, S= 0.05% and Ash = 1.1% The bagasse is burned with an excess air factor of 1.32 and the flue gas exits with 240°C in the stack.
Electricity and steam are almost required in every step of raw sugar process, especially in juice extraction, clarification, evaporation and sugar drying, good quality steam takes a crucial role. Thus selection of steam boilers becomes very important for sugar plant. Bagasse, nearly 30% fiber contained in sugar cane, is produced during the processing of sugarcane, is burned as fuel for the …
John Thompson, the Cape Town based designer and manufacturer of industrial boilers and ancillary equipment, has successfully carried out the performance tests on an 80 t/h bagasse-fired watertube boiler and pre-boiler plant that they supplied for the sugar mill of Compagnie Sucriére de Kwilu Ngongo (CSKN) in the Democratic Republic of Congo (DRC)
In a sugar mill, steam is used primarily for generating power, concentrating sugar juices, and drying sugars. The economic viability of the cane sugar mill largely depends upon the use of bagasse as a fuel to generate power and process steam. Otherwise, the other biomass fuels (wood, straw, etc.) could also be used to decrease the cost on boiler fuel.
