OCR Text |
Show baghouse. 1 t uses a commercial two-fluid nozzle for water spray humidification, as required for Coolside process simulation. The disposal of solid waste is an important efement in the demonstration of the Coolside process. Coolside waste differs from bituminous coal fly ash in that it has a high calcium content (25 to 40 wt % determined as CaO) and may have an elevated sodium content (2 to 4 wt % determined as Na 20). As indicated in the Consol Martinsville field tests (1,2), the major components of the spent sorbent in Coolside waste are Ca(OH) 2 and CaS0 3 • Minor components include Na 2 5° 3 , Na 2 SO,+, CaSO,+ and CaC0 3 • The presence of these components may make the physical and chemical properties of Coolside waste different from those of wastes generated from other dry flue gas desulfurization (FGD) processes such as the Limestone Injection Multistage Burner (LIMB), lime spray dryer and fluidized bed combustion processes. The physical and chemical properties of solid wastes from these emerging dry FGD processes have been studied and reported (5,6,7). Certain waste properties (density, compressive strength, permeability, leachate composition, reactivity) have direct effects on handling, transportation and disposal. In this study, these properties were determined for Coolside waste. SORBENT EVALUATION SORBENT PERFORMANCE COMPARISON Table shows that there was considerable variation in Coolside desulfurization performance among the 12 sorbents tested. At 111 (Ca+Mg)/S and 0.2/1 Na/(Ca+Mg) mol ratios and 25°F approach (Figure 3), measured 502 removals ranged from 22 to 39% across the humidifier and from 26 to 50% across the system (humidifier + baghouse). At 2/1 (Ca+Mg)/S and 0.2/1 Na/(Ca+Mg) mol ratios and 25°F approach, 502 remova Is ranged 41 to 60% across the humidifier and 54 to 80% across the system. Hydrated calcitic limes were generally superior to pressure hydrated dolomitic limes. The sorbent evaluation results clearly 3 |