(best examples and good practices) on household organic waste ...
(best examples and good practices) on household organic waste ... (best examples and good practices) on household organic waste ...
41 Figure 16.: Grate system structure (Thermal methods of municipal waste treatment. .,2009) As indicated by their name, grate furnace incinerators consist of a furnace in which the waste burns over a grate. The operation temperature of the furnace is between 750°C to 1000°C. Air for combustion is circulated evenly with the use fans or blowers under
42 Rotary kiln furnaces Rotary kiln waste incinerators (Figure 17.) are not so popular for the mass incineration of waste in Europe but are commonly used for the incineration of hazardous wastes. A rotary kiln rotates the waste in a cylindrical furnace in order to optimize mixing
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41<br />
Figure 16.: Grate system structure<br />
(Thermal methods of municipal <strong>waste</strong> treatment. .,2009)<br />
As indicated by their name, grate furnace incinerators c<strong>on</strong>sist of a furnace in<br />
which the <strong>waste</strong> burns over a grate. The operati<strong>on</strong> temperature of the furnace is<br />
between 750°C to 1000°C. Air for combusti<strong>on</strong> is circulated evenly with the use<br />
fans or blowers under <str<strong>on</strong>g>and</str<strong>on</strong>g> over the grates. The grates have many different<br />
shapes <str<strong>on</strong>g>and</str<strong>on</strong>g> vary between them (either fixed or moving). The moving grates are<br />
designed to increase mixing <str<strong>on</strong>g>and</str<strong>on</strong>g> air flow in the mass of burning <strong>waste</strong> in order<br />
to achieve a more complete combusti<strong>on</strong>. These variati<strong>on</strong>s produce significantly<br />
different types of gaseous emissi<strong>on</strong>s from the incinerators <str<strong>on</strong>g>and</str<strong>on</strong>g> the burning<br />
process products have varying quantity <str<strong>on</strong>g>and</str<strong>on</strong>g> quality. The large excess (in the<br />
order of 100%) of air needed for the satisfactory combusti<strong>on</strong> of <strong>waste</strong>s in these<br />
furnaces has two main disadvantages: energy loss in the stack through the gases<br />
<str<strong>on</strong>g>and</str<strong>on</strong>g> need for a large boiler volume to h<str<strong>on</strong>g>and</str<strong>on</strong>g>le the extra volume of gases.<br />
(B<strong>on</strong>toux.,1999)
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