Abstract
In general, the biomass raw materials burned by biomass power plants generally have the characteristics of variable fuel types, high moisture content, and high volatile content. In this paper, a 130 t/h biomass circulating fluidized bed (BCFB) model was established on the MWorks platform with Modelica language. The influence of biomass type changes on operation parameters, the corresponding steady-state characteristics, and the dynamic characteristics of the BCFB were carried out. The temperature corresponding to the combustion of pine was overall higher than that of the other fuels, and the flue gas from the combustion of pine had the highest concentration of SO2, up to 520.49 mg/Nm3. The flue gas from the combustion of pure cotton sticks had the highest concentration of NO, up to 254.34 mg/Nm3. The changes of fuel type and moisture content all have a great influence on the operation of BCFBs. The emission of pollutants was not only related to the element content of fuel, but also closely related to the furnace temperature. The fuel moisture content also indirectly affects the pollutant emission concentration and the steam-water system.
Highlights
Energy is an important material basis for the survival and development of human society
Due to the saturated steam flow being less than the initial value, the final main steam temperature was higher than the temperature of fuel (#1), and the change of the fuel moisture content had an obvious influence on the steam-water system
Based on Modelica language, a 130 t/h biomass circulating fluidized bed model was established on an MWorks platform
Summary
Energy is an important material basis for the survival and development of human society. The extensive use of fossil energy has greatly promoted the development of society, but has caused serious environmental pollution and greenhouse gas emissions [1]. The variation of fuel type and quality will cause drastic changes in combustion process variables (such as the furnace temperature, main steam pressure and temperature, flue gas composition, emission pollutants, etc.). This leads to combustion instability, heating surface corrosion and slagging, and even bed material agglomeration causing fluidization state failure. The effects of different types and quality of biomass fuel on the furnace temperature, steam and water system, and pollutant emissions in the flue gas were studied
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