燃煤锅炉烟气脱硫资源化利用工业示范研究

Study on the Industrial Demonstration of Resource Utilization of Flue Gas Desulfurization from Coal Burning Boiler

对利用低品位软锰矿浆脱除燃煤锅炉烟气中SO2的技术进行了中试研究,考察了软锰矿粒径、矿浆中硫酸浓度、液固质量比、反应温度、反应时间、矿浆流量等因素对烟气脱硫和锰浸出效果的影响,建立了3000 m3/h燃煤锅炉烟气脱硫资源化利用的工业示范工程。结果表明,燃煤锅炉烟气脱硫资源化利用的适宜工艺条件为:软锰矿粒径为0.125 mm,矿浆中硫酸浓度为20 g/L,液固质量比为5∶1,反应温度为80℃,反应时间为7 h,矿浆流量为50 m3/h。在适宜的工艺条件下,锰浸出率为91.5%,烟气脱硫率为90.2%,烟气中SO2浓度由1900 g/m3降低至130 g/m3以下。利用净化除杂、高温氧化处理后的硫酸锰溶液可制备高性能的电解二氧化锰,该电解二氧化锰的质量优于普通电解二氧化锰。

Pilot scale test of desorption of SO2 in flue gas from coal burning boiler utilizing low-grade pyrolusite pulp as desulfurizer was studied. Effects of some factors such as pyrolusite particle size, sulfuric acid concentration in ore pulp, the mass ratio of liquid-to-solid, reaction temperature, reaction time and ore pulp flow on the effectiveness of flue gas desulfurization and manganese leaching were investigated. The industrial demonstration project of resource utilization of 3000 mS/h flue gas desulfurization from coal burning boiler was established. The results showed that the optimized technical conditions of the resource utilization of flue gas desulfurization from coal burning boiler were as follows： pyrolusite particle size was 0.125 mm, sulfuric acid concentration in ore pulp was 20 g/L, the mass ratio of liquid-to-solid was 5 ： I, reaction temperature was 80 ~C, reaction time was 7h, and ore pulp flow was 50 m3/h. The leaching rate of manganese in pyrolusite was 91.5 %, the desulfurization rate of flue gas 90.2 %, and the concentration of SO_~ in flue gas from 1900 g/m3 reduced to 130 g/m3 under the optimized technical conditions. After manganese sulfate was purified and oxidated under high-temperature, it could be prepared high performance electolitic manganese dioxide. The quality of this electolitic manganese dioxide was superior to that of common electolitic manganese dioxide.