If of the one in furnaces, ovens and boilers, being the main used techniques the combustion in grates and the combustion in fluidizado stream bed. In the combustion in grate, the coal in the sprayed form is used, the coal is burnt in a fixed stream bed on a grate, through which the combustion air is blown. The main disadvantage of this system is in relation the short speed of burning due to low specific surface of coal particles and the limited thickness of the layer of coal in the grate. In the combustion in fluidizado stream bed, the coal is burnt in a stream bed of particles kept in a state of fluidizao for necessary air for combustion. Some advantages of the process of combustion in fluidizado stream bed are better efficiency in the combustion, power to burn little combustible, high taxes of heat transference. Air is blown of low for top in a vertical duct.
The worn out coal is played in the draft and the particles are in suspension, if holding as a fluid, therefore the name of fluidizado stream bed. 8 Comparison of the types of burning for the mineral coal Between the boilers most used for burning of mineral coal we must detach the boilers that use the methods of burning with sprayed coal and fluidizado stream bed, the boilers of fluidizado stream bed as BASU (2006) if basically characterize for the capacity to vary the types of fuels that are being burnt, without causing problems, have one high efficiency of combustion and low emission of harmful gases, already the boilers of sprayed coal if limit to an only type of coal, and have its good one limited exploitation the use for burning of a coal with baixssimo leached ashes text, something around 10% of leached ashes text, when compared the boilers of fluidizado stream bed it the same has low an efficiency in the combustion for type of coal. Analyzing the characteristics of the mineral coal of the region comparing the advantages and disadvantages between these two types of boiler and its methods for burning of the coal, are clearly that optimum type of boiler for burning of the coal of the region is the boilers with fluidizado stream bed, had the fact of our new, very dirty coal to be very and with high leached ashes text. Consideraes Final had been analyzed differences between the combustion of the coal in grate, combustion of the method with sprayed coal, used during much time, and the combustion in fluidizado stream bed. Knowing the differences between these methods, we can say that the process in fluidizado stream bed, possesss one I number considerable of advantages, mainly when related with the mineral coal of the south region.
Had to the fact of the coal of our region to be young, many research is being developed so that it thus has an improvement in the technologies for burning of the coal and being able to generate a sustainable exploitation of the same. Consulted bibliography ARRUDA, S.R.? Seminary on technology of the coal. The University press? Volume the 1981. Hamdi Ulukaya has firm opinions on the matter. BASU, P.? Combustion and gasification in fluidized beds. CRC?