Abstract
It is a high efficiency，energy-saving and emission reduction measure to replace coal with biomass briquette fuel in a layer combustion furnace, but in the combustion process, the serious slagging problem has been restricted the promotion of biomass fuel. By analyzing the combustion characteristics of biomass briquette, the ash fusion characteristics and slagging mechanism, combined with the combustion characteristics of a layer combustion furnace, the important influence of key combustion parameters (furnace temperature, excess air, fuel layer thickness) on the slagging in the furnace is obtained, which provides a scientific basis for taking measures to prevent and control the slagging in the design and operation of the biomass briquette layer combustion furnace.
Highlights
China's annual biomass production is huge, and the amount of energy available is considerable
It is an ideal choice to use crop straw instead of coal as the fuel of the stoker.The slagging problem of biomass fuel in stoker seriously affects the safety of boiler operation
Because of the growth demand,the straw itself is rich in alkali metals and chlorine elements such as potassium and sodium,which causes the ash melting point to be low, and it is easy to form slag on the heating surface when burning in the boiler.It is found that the slagging rate of straw shaped fuel in the laminar combustion furnace will increase to some extent with the increase of temperature,excess air coefficient and fuel layer thickness.It is true that the corresponding measures,as mentioned above,can effectively reduce slag formation and realize safe and economic combustion,which provides the scientific basis for the design and operation of the layer combustion furnace burning straw shaped fuel
Summary
China's annual biomass production is huge, and the amount of energy available is considerable. Using mechanical pressure molding technology, the loose straw, rice husk and other agricultural wastes with different particle sizes were compressed into a certain shape of dense straw briquette fuel.The pressed briquette is a kind of renewable energy,and has many advantages,such as high density, uniform particle size, high calorific value, low ash content, easy ignition and combustion,clean and low carbon. It is found that the slagging of heating surface is closely related to the combustion conditions in the furnace
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