✍ Scribed by G.P Reed; A Ergüdenler; J.R Grace; A.P Watkinson; A.A Herod; D Dugwell; R Kandiyoti
No coin nor oath required. For personal study only.
Analyses of solid streams from a pilot-scale coal gasi®er equipped with hot-gas ®ltration at 5808C have indicated that all coal-derived mercury was carried away by the fuel gas. Calculations using a thermodynamic equilibrium model have con®rmed that there was little potential for removal of mercury in the hot gas ®lter at these temperatures. In this work, several experimental capture/recovery methods have been used in attempting to quantify the amount of mercury carried in the fuel gas. Standard wet' sampling methods have not worked well. A dry' mercury-capture method has been evaluated for determinations of mercury release from a pilot-scale gasi®er equipped with a hot gas ®lter. At temperatures below 2008C, the ®ne dust on the hot gas ®lter was able to capture signi®cant amounts of mercury. The ®ndings from pilot-scale experiments have been examined by work in a specially designed bench-scale apparatus. Mercury removal was shown to be due to a reaction with the carbonaceous dust from the gasi®er; the dust had substantial capacity for mercury capture at temperatures below 2008C. The effect of the dust in modifying the bulk thermodynamic properties of the hot gas ®lter system composition is attributed to chemisorption of HgS. The capacity of the dust for mercury capture was observed to be much greater in the laboratory-scale reactor than in the hot gas ®lter of the pilot plant. This observation is believed to be due to the main mechanism of dust collection by the ®lter being gravity separation directly to the hopper, rather than deposition as a ®lter cake.
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