Abstract
The semi-dry desulfurization of slime fluidized bed boilers (FBB) has been widely used due to its advantages of low cost and high desulfurization efficiency. In this paper, the cooperative optimization of a two-stage desulfurization processes in the slime fluidized bed boiler was studied, and a model-based optimization strategy was proposed to minimize the operational cost of the desulfurization system. Firstly, a mathematical model for the FBB with a two-stage desulfurization process was established. The influences of coal slime elements on combustion flue gas and the factors that may affect the thermal efficiency of the boiler were then analyzed. Then, on the basis of the developed model, a number of parameters affecting the SO2 concentration at the outlet of the slime fluidized bed boiler were simulated and deeply analyzed. In addition, the effects of the sulfur content of coal slime, excess air coefficient, and calcium to sulfur ratio were also discussed. Finally, according to the current SO2 emission standard, the optimization operation problems under different sulfur contents were studied with the goal of minimizing the total desulfurization cost. The results showed that under the same sulfur content, the optimized operation was able to significantly reduce the total desulfurization cost by 9%, consequently improving the thermal efficiency of the boiler, ensuring the stable and up-to-standard emission of flue gas SO2, and thus achieving sustainable development.
Highlights
China is one of the countries with the most serious air pollution
On basis of the above processinofthe coal fluidized bed boiler synergistic desulThethe volume fraction of oxygen airslime is 21%, and the theoretical air volume furization operation, this paper mainly studied the calculation that is included in the comrequired for the desulfurization reaction is expressed as position of coal slime combustion flue gas, consumption of the material and the energy of
In-furnace calcium injection and semi-dry method synergistic desulfurization used in the entire coal slime fluidized bed boiler desulfurization system
Summary
China is one of the countries with the most serious air pollution. It is reported that more than 80% of the total coal consumption is used for direct combustion, and the total. The way in which to coordinate the relationship between the two processes and rationally allocate the share of the two-stage desulfurization requires consideration of various factors [14] In this case, the SO2 emission concentration can reach the standard operation, and the overall material consumption and energy consumption costs can be realized at their corresponding lowest levels. In the field of denitrification in power plants, Yu Han et al [17] believed that a reasonable increase in the temperature of Selective catalytic reduction (SCR) denitrification flue gas would bring about better de-NOx performance in the cold end of the coal-fired boiler, and proposed a collaborative optimization strategy for energy conversion and NOx removal in the cold end of the boiler.
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