How to deal with the challenge of sulphuric acid production from low concentration SO_2
JI Luojun;The National Information Centre of Sulphur & Sulphuric Acid Industry;Sinopec Nanjing Research Institute of Chemical Industry Co.,Ltd.;
The source and resource utilization of low concentration SO_2 in China are introduced.Two difficult problems in the production of heat balance and water balance in the production of sulphuric acid from low concentration SO_2 flue gas need to be cracked.Depending on characteristics of enterprise and surrounding situation,there are a variety of solutions to be chosen,for example,high/low concentration SO_2 gas distribution process,renewable recovery SO_2 process( such as organic amine method,inorganic solvent absorption method,activated coke method) and SO_2 low temperature condensation process,these methods and conventional contact process were used to directly produce sulphuric acid.Wet sulphuric acid process( WSA/SNOX,Conchet,MECS-SulfoxTM,SOP) and non steady acid process were used to unconventional produce sulphuric acid.The applicable technical route is proposed to produce sulphuric acid using flue gas of SO_2 concentration less than 5. 0% and fluctuate flue gas of SO_2 concentration 2. 0%-7. 0%. The renewable SO_2 recovery technology and conventional single-absorption process,double-condensation wet sulphuric acid and reusable desulphurization process,high/low concentration SO_2 gas distribution process are the main trend in the future.