Evaluation of gas-particle partition of dioxins in flue gas I: Evaluation of gasification behavior of polychlorinated dibenzo-p-dioxins and polychlorinated dibenzofurans in fly ash by thermal treatment

Evaluation of gas-particle partition of dioxins in flue gas II: Estimation of gas-particle partition of dioxins in dust-rich flue gas by parallel sampling with different conditions

“…Therefore, with respect to particle-rich flue gas, adsorption of gaseous PCDD/Fs onto collected particles during sampling would be source of error in predicting gas-particle partitions using the equation: such obvious difference in R G 1 and R G 3 suggests that gas-particle partitions of PCDD/Fs in flue gas do not depend only on saturation vapor pressure of each analyte and particle concentration of the gas. In a separate paper [4] we observed that fly ash PCDD/Fs started to gasify in the range of 350-400 • C. However, our results suggest that a high proportion of PCDD/Fs would be in the gaseous form in sample 1 to 3 whose temperature was apparently lower than the gasification range. The high gaseous form ratio even in low-temperature flue gas may be associated with the behavior of gaseous PCDD/Fs in flue gas: although fly ash PCDD/Fs would promptly gasify under a high-temperature condition (over 350 • C), the gaseous PCDD/Fs may not be easily adsorbed onto fly ash particles even under a low-temperature condition due to too low particle concentration and low adsorption capacity of fly ash [12,21].…”

“…The gasification behavior of fly ash PCDD/Fs was reported in a separate paper [4], stating that fly ash PCDD/Fs gasified in the range of 350-400 • C, suggesting that this is the threshold of their gas-particle partition in flue gas within the temperature region. It is, however, difficult to determine the partitions of PCDD/Fs on the basis of gas temperature only, since their physical states depend on other properties as well.…”

Study of the Memory Effect of PCDD/F During the Combustion of Several Biomasses in A Moving Grate Boiler

“…Another study by Yokohama et al has revealed that that PCDD/Fs (contained in ashes collected from a cooling system of a municipal waste incinerator) start to gasify at 350°C by thermal treatment performed using gas chromatograph (GC-12A) column oven (Yokohama et al 2008). It was shown that dioxin gasi cation behavior in y ashes depends on various conditions such as ow rate, ashes weight, heating period and temperature of treatment (Yokohama et al 2008). Another study reported the behavior of simulated y ashes when heated at 350°C under a ow of N 2 and a ow of N 2 containing 10% of H 2 .…”

“…High emissions in the exhaust gas were associated to a phenomenon of desorption of dioxins from the y ashes to the gas phase Williams 2007a, 2009). Another study by Yokohama et al has revealed that that PCDD/Fs (contained in ashes collected from a cooling system of a municipal waste incinerator) start to gasify at 350°C by thermal treatment performed using gas chromatograph (GC-12A) column oven (Yokohama et al 2008). It was shown that dioxin gasi cation behavior in y ashes depends on various conditions such as ow rate, ashes weight, heating period and temperature of treatment (Yokohama et al 2008).…”

Zeolite Preparation Coupled with Alkali Recovery from Catalytic Gasification Ash by One-Step Hydrothermal Treatment

“…However, there is scarce information about the utilization of CGA. Fortunately, the utilization of coal fly ash (CFA) has been developing for a long time and its technology is relatively mature; − thus, it can offer some references and experiences for the utilization of CGA. CFA is widely used for the manufacture of bricks and cement, preparation of sintered foam, extraction of alumina, , preparation of SiO 2 , and synthesis of zeolite. , The differences between CFA and CGA must be understood before a feasible CGA utilization method is proposed.…”