Structural analysis of thermal fuel fuel property on the example of solid biofuel
DOI:
https://doi.org/10.31548/10.31548/energiya2018.05.206Abstract
The purpose of the work is to study the structure of the calorific value of the fuel and the influence of the component parameters on its magnitude.
Materials and methods of research are based on the use of direct methods of direct measurement of the heat of combustion of different types of fuels with the application of the methods of heat transfer theory, thermodynamics, thermophysics, the theory of measurements in stationary conditions.
The theoretical and experimental component of research of calorific value of fuels was carried out on calorimetric bomb type В -08 M.
The fuel fed into the furnace is called working fuel. The composition of organic fuel includes combustible elements and non-combustible impurities (ballast).
Combustible components of solid and liquid fuels - carbon C, hydrogen H, oxygen O, sulfur organic Sop and sulfur pyrogenic SK - form with oxygen O and nitrogen N complex chemical compounds. The fuel ballast is ash A and moist W. The composition of fuels is expressed as a percentage of up to 1 kgof mass. In the fuel of carbon contains 50-95 %, while hydrogen 1-11 %, burning sulfur 0-8 %.
The composition of fuel by mass is used for thermal calculations of boiler units.
On the basis of theoretical and experimental studies the structure of the heating value in the illustrated form, the connection between its parameters is presented. It is assumed that energy is formed when combustion of a dry ashless mass. As can be seen, the net calorific value is largely determined by the level of humidity, since evaporation of water requires energy expenditure, namely the calorific value of solid biofuels, depending on relative humidity, can vary in the range from 20 MJ/kg at a moisture content of 0 % to 1.5 at humidity 90 %.
Keywords: calorimetric process, calorimetric bomb, higher, lower heat of combustion, structure, calorific value
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