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NOx removal from simulated marine exhaust gas via wet absorption using TBAB/PBS composite solution and subsequent reduction by adding Na2SO3

Zhengxiong Jiang,Zhitao Han

With the aim to develop wet denitration process for marine application, it is still challenging to simultaneously achieve high-efficiency NO x removal from flue gas and low nitrate concentration in scrubbed solution. Herein a novel two-step method was proposed to solve this issue: phosphate buffer solution (PBS) with organic additive was used to absorb NO x efficiently from flue gas, and in next step, Na 2 SO 3 as a reductant was added in the scrubbed solution to reduce NO x off-line. Five typical organic additives were chosen to compose with PBS. The tetrabutylammonium bromide and phosphate buffer solution (TBAB/PBS) composite solution exhibited superior NO x absorption performance. Furthermore, the effects of TBAB concentration, NO x oxidation degree, solution pH, temperature and O 2 concentration on NO x absorption performance of TBAB/PBS composite solution were investigated systematically, and a high NO x absorption efficiency of >90% could be achieved. It was mainly attributed to a physical complex between PBS and NO 2 , N O 3 − $$ N{O}_3^{-} $$ , N O 2 − $$ N{O}_2^{-} $$ , together with a mass transfer enhancement by TBAB. A long-run test showed that nitrate concentration was much lower than the limit value of IMO. Cyclic absorption and regeneration tests confirmed that Na 2 SO 3 could effectively regenerate the scrubbed solution in the absence of O 2 .