Interaction between emissions of SO2 and HCl in fluidized bed combustors

Effects of existing energy saving and air pollution control devices on mercury removal in coal-fired power plants

“…The sulfur content in the two coals is relatively higher and more SO 2 was detected in the flue gas according to Table 3. However, a previous study [30] suggested that SO 2 could deplete the Cl 2 , a stronger oxidant for Hg 0 , through the following reaction (Eq. (4)):…”

Absorption behavior of chlorine and sulfur by Ca(OH)2 under simulated conditions with a fluidized bed combustor

“…In the course of simultaneous chlorination and sulphation, however, large voids are shaped, and then the voids among aggregates possibly play a role of the diffusion paths for HCl and SO 2 toward the interior of absorbent particles. On the other hand, Xie et al [3] suggested that SO 3 formed by the chemical Eqs. 5, 6 would be more easily absorbed by limestone than SO 2 .…”

“…The simultaneous absorption of SO 2 and HCl by Ca-based absorbents in hot flue gases has been reported in several publications. Using thermogravimetric experiments, Matuskata et al [2] and several researchers [3][4][5][6] reported that the coexistence of HCl with SO 2 significantly increased the conversion rate of CaO to CaSO 4 at 750°C.…”

“…Xie et al [3] and Liu et al [4] suggested that HCl could promote conversion of SO 2 to SO 3 , because SO 3 is more easily absorbed by limestone than SO 2 during fluidized bed combustion. Matsukata et al [2] and Partanen et al [5] also suggested that melting an eutectic mixture of CaCl 2 and CaSO 4 might heavily promote SO 2 absorption in cases of simultaneous absorption of HCl and SO 2 due to the formation of voids playing a role of the diffusion paths for HCl and SO 2 toward the interior of the absorbing particle.…”

Geology and combustion perspectives of Pakistani coals from Salt Range and Trans Indus Range

“…For elimination of SO 2 in flue gases, limestone is mixed with the coal and Ca/S ratio could be 1 -5 [31] in FBC boiler depending upon limestone quality, particle size, the quality of solid mixing, combustion temperature, degree of fly ash recirculation in case of CFBC and schematic of coal and limestone feeding points [32]. To get the same desulfurization efficiency, the Ca/S ratio should be higher than 4 for grate boiler and higher than 6 for Pulverized Fuel Boiler [33]. Addition of more limestone for higher sulfur in coal may form CaS that is one kind of catalyst which facilitates nitrogen to be converted to NO x .…”