| SO2 emission from coal combustion significantly threatens peoples' health and the global environment, so it is imperative to find a cost-effective method for SO2 removal. Calcium-based desulfurization technology is especially suitable in our country due to its low cost and easy use. However, low desulfurization efficiency at high temperature as well as low utilization ratio of calcium have limited the development of this technology when using calcium-based sorbent alone. A new method, doping some additives into the calcium-based sorbent, has been developed to resolve this problem.In this study, static and dynamic experiments have been done to investigate the sulfur retention mechanism with a new Calcium-based compound additive. The influence of some factors, such as coal type, sulfur sorbent, Ca/S, additives and temperature etc, on sulfur retention efficiency have been studied. Moreover, the desulfurization solid residues were analyzed by means of XRD and SEM methods. The result shows that the sulfur retention efficiency at high temperature is very low, and almost equal to zero up to 1300℃. However, Barium-based sulfur sorbent has higher sulfur retention efficiency at high temperature except for high cost. With the increasing of Ca/S, the sulfur retention efficiency increase gradually and achieve maximum when Ca/S is 3. Adding SrCO3 can also increase the sulfur retention efficiency obviously, for example, when at the optimal temperature(T=950℃),it increased by 13%. The improvement of sulfur retention ability can be explained by the activation of additive. Finally, F*A*C*T software was used to carry out the simulation calculation ,and good agreement of simulation and experiment results was obtained.
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