Abstract： |
An ignition method and arrangement for fossil fuel is provided, which pertains to the technical field of combustion and equipment. In the invention, before a primary air flow containing powder fuel enters into a combustion chamber, the primary air flow is gradated, then the thick powder air flow is divided into a bigger and a smaller whiff, wherein, the flow area of the channel for the smaller whiff accounts for 15-40% of the total area of the channel for the thick powder air flow. The smaller whiff of thick-powder air flow is mixed with an air flow with high oxygen concentration, so that the oxygen concentration in the smaller whiff of thick-powder air flow is 22-95%, and the stoichiometric ratio of oxygen to the fuel is 0.4-1.2. By improving the pyrolyzation and reaction condition, the invention accelerates and increases the separation out and pre-stage firing of the volatile components of the fossil fuel, improves greatly the firing property of air flow, can realize the firing and low-load steady combustion of fossil energy with low volatile components without using combustion-supporting oil or reducing greatly the use of combustion-supporting oil; in addition, in the invention a steady small flame can be formed, the primary air flow is fired by a way of igniting a big fire through a small flame, this greatly saves the oxygen consumption during the ignition. |
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