Experimental Research On Optimization Of Operational Parameters Of The WX/U Desulfurization Equipments

WX/U desulfurization equipments, an efficient desulfurization and dust removal systems for medium-sized and medium-sized boiler, had been developed independently by Tianjin University under the support of the Tianjin Natural Science Foundation Committee. In the initial design, the Sodium-calcium dual-alkali method was adopted as its primary process. To further reduce the operational cost for extending the application scale of WX/U desulfurization equipments, it was necessary to select a cheaper absorbent and obtain higher removal efficiency with the help of the enhancement of an appropriate additive.In present paper, the simulation experimental set-up of WX/U desulfurization equipments was established and the removal efficiency of various absorbents was investigated firstly. The experimental results showed that lime slurry was the fittest desulfurization absorbent. Secondly, to select an appropriate additive, the enhancement of various additives on the removal efficiency of WX/4U desulfurization equipments using lime as absorbent was investigated experimentally. The results showed that the sequence of enhancement was sodium sulfate>black liquor>formic acid>critic acid>adipic acid>magnesium>magnesium sulfate. Among these additives, sodium sulfate was the most promoting additive for WX/4U desulfurization equipments for its highest enhancement on removal efficiency and the low operation cost.Lastly, the effect of operational parameters on the removal efficiency under the condition that sodium sulfate as an additive for lime slurry was investigated. And the optimum operational parameters under the condition that sodium sulfate as additive were obtained as follows. The mass concentration of lime was 0.8%, liquid-to-gas ratio was 1.0 l·m-3, gas velocity in throat was 40 m·s-1 and the effective concentration of sodium sulfate was from 0.004 mol·l-1 to 0.006 mol·l-1.