摘要
某公司循环流化床(CFB)锅炉通过炉内喷钙+炉后CFB半干法二级脱硫工艺实现了SO2超低排放,但运行成本较高。通过对炉后CFB半干法脱硫及二级脱硫SO2负荷分配的优化试验,探索出经济性较好的运行模式。结果表明,应控制脱硫塔的出口烟气温度在70~75℃、床层压降在1.20 kPa、入口SO2质量浓度在700~1100 mg/m^(3)。优化后,二级脱硫总钙硫比(钙与硫的摩尔比)由3.14降至1.90~2.18,脱硫剂成本由1280~1506元/t(以SO2计)降至783~890元/t。该工艺的出口SO2质量浓度可稳定达到不高于35 mg/m^(3)的超低排放要求。
The circulating fluidized bed(CFB)boiler of a company has achieved ultra-low SO2 emission through the process of limestone injection desulfurization and after-furnace CFB semi-dry secondary desulfurization,but the operation cost is high.Through the optimization test of SO2 load distribution between after-furnace semi-dry desulfurization and secondary desulfurization,a better economic operation mode is explored.The results show that the outlet flue gas temperature of desulfurization tower should be controlled at 70-75℃,the bed pressure should be controlled at 1.20 kPa,and the inlet SO2 concentration should be controlled at 700-1100 mg/m^(3).After optimization,the total mole ratio of Ca to S is reduced from 3.14 to 1.90-2.18,and the cost of desulfurizer is reduced from 1280-1506 yuan/t(based on SO2)to 783-890 yuan/t.The mass concentration of SO2 at the outlet can stably meet the ultra-low emission requirement of no more than 35 mg/m^(3).
作者
田志娟
王鹏举
TIAN Zhijuan;WANG Pengju(Sinopec Luoyang Company,Luoyang 471012,China)
出处
《化工环保》
CAS
CSCD
北大核心
2021年第3期371-376,共6页
Environmental Protection of Chemical Industry
