催化裂化装置烟气脱硫方案的技术经济性研究

TECHNIQUE-ECONOMICS ANALYSIS OF FCC FLUE GAS DESULFURIZATION SCHEMES

以某炼油厂1.80Mt/a两段提升管催化裂解多产丙烯装置为例,对催化裂化操作单元内采用硫转移剂方案与烟气湿法脱硫方案对再生烟气脱硫技术的经济性进行研究,从试剂、回收产品和碱渣处理费用、设备投资、操作费用、占地面积等方面进行了对比。结果表明:在目前环保要求条件下,催化裂化再生烟气中SOx浓度低于1 000mg/m3(标准状态)时,采用硫转移剂方案比采用湿法脱硫方案更加经济;当烟气中SOx浓度更高时,可采用硫转移剂与湿法脱硫组合工艺或单独采用湿法脱硫工艺。

FCCU flue gas desulfurization process is now in a boom period. There are sulfur transfer additive and wet flue gas desulfurization （WFGD） that can be selectively considered for a 1.80 Mt/a cat- alytic cracking unit with two risers for prolific propylene. The cost of additives, recycling product andalkali waste treatment, equipment investment, operating cost and occupied areas of schemes were com- pared comprehensively. The results show that under the present environmental requirements, the scheme adopting sulfur transfer additive is more economical than the WFGD when the SOx content in flue gas to be treated is less than 1 000 mg/m3, while in the case of more than 1 000 mg/m3 SOx, the combination of above two schemes or only the WFGD may well be adopted.