Wheat straw combusition kinetics
2000
Pesenjanski, I.
The high volatile content of wheat has a dominaNt influence on the combustion process picture. On this basis, a hypothetical model of a mono-molecular reaction of the wheat burning process of the Arrhenius equation type, was developed. It was assumed that the reaction rate is proportional to the mass of unburned fuel. A one-factorial experiment with linear quasi-stationary temperature change was projected. External factors and factors of poor action were maintained on a constant level. The experiments were conducted with the following nominal velocities of temperature changes in the furnace and the samples: 2.5; 5; 10; 25 deg C/min. The obtained results indicated three temperature intervals in which the wheat straw behaves in a different way. The most intensive reactins of volatile isolation happened between temperatures of 160-250/300 deg C. After this a period of reaction rate slow down occurred and after 50-80 deg C it was maintained on a constant rate all the way to the conclusion of the reaction at temperature between 420-520 deg C. The velocity of mass change in the function of temperature is projected in the Arrhenius coordinates as a saddle curve which is well approximated by the linear regression in the temperature intervals. A uniform polynomial expression of the sixth degree also provides a sufficiently high coefficient of determination.
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