Experimental research on simultaneous removal of CO₂, SO₂ and NOx by amine-sulphone solution

Environmental problems caused by CO₂, SO₂, NO_x and other pollutants have become increasingly prominent. It has been a research hotspot to remove CO₂, SO₂ and NO_x simultaneously with simple technique, relative lo w operation cost. We made amine-sulphone solution with N-methyl-diethanolamine (MDEA) and dimethyl sulfoxide (DMSO) as the absorbent of SO₂/CO₂/NO_x. A bubbling bed absorption system was designed and built to investigate the absorption properties of amine-sulphone solution toSO₂/CO₂/NO_x. The solution formula and working condition were discussed to figure out the optimu m choices of formula, solution concentration and flo w rate of flue gas. According to the regulations of absorption rate, absorptive amount and removal ratio, the solution formula with 52.5%MDEA+17.5%DMSO showed the best simultaneous absorption properties to SO₂/CO₂/NO_x. And 70% were the optimum concentration choice for the of amine-sulphone solution, taking absorbent cost, mass transfer and absorption quality into consideration. There's a flow rate inflexion point for the absorption of each gas, which is the boundary of rapid dropping and stable interval of removal ratio. The minimum of inflexion point for SO₂/CO₂/NO_x was the optimu m flue gas flo w rate for high removal ratio and low cost, which was 1L/min in the experiment.