Removal of SO₂ with Sodium Sulfite Solution in a Rotating Packed Bed

Abstract

High efficiency and compact design of the desulfurization technology is necessary to meet the strict emission requirement of the marine environment. A rotating packed bed (RPB), having high mass transfer efficiency and small size, is an excellent choice for SO2 removal from the exhaust gas in ships. In this work, SO2 removal in a laboratory and a pilot RPB with sodium sulfite solution were investigated. Experimental results show that the SO2 concentration at the gas outlet of the RPB can decrease sharply and it has no obvious scale up effect. A correlation of the mass transfer coefficient (K y a) was proposed and the predicted K y a agrees with the experimental data with a deviation within ±15%. Compared with the spray tower, the RPB has a higher SO2 removal efficiency and a quarter volume, which displays a bright future for the offshore application of SO2 removal.

NO Removal from Simulated Diesel Engine Exhaust Gas by Cyclic Scrubbing Using NaClO2 Solution in a Rotating Packed Bed Reactor

“…A NO x removal efficiency of 67.4% had been obtained. e results demonstrated that high liquid-gas ratio could enhance the mass transfer at the liquid-gas interface in the RPB reactor [6]. erefore, it promoted the NO oxidation obviously and the NO x absorption slightly during the cyclic scrubbing process in the RPB reactor.…”

“…At present, a number of De-SO x and De-NO x technologies have been developed for large vessels [3]. Some wet flue gas desulphurization (WFGD) techniques have been successfully applied on board to remove SO x effectively [6]. ough selective catalytic reduction (SCR) and exhaust gas recirculation (EGR) are two relatively mature De-NO x methods for marine diesel engines [7] and their NO x challenges efficiencies are high enough, there are still some problems limiting their large-scale applications.…”

“…So, it could intensify the gas-liquid mass transfer and micromixing efficiency up to 1-3 orders of magnitude larger than that in a conventional packed column [31]. us, RPB reactors can be widely used in gas-liquid reaction processes, such as distillation [32], wastewater treatment [33], SO 2 removal [6], and CO 2 capture [34]. Some experiments have also been done to remove NO x from flue gas by wet scrubbing method based on RPB reactors in recent years.…”

Liquid jet impaction on the single‐layer stainless steel wire mesh in a rotating packed bed reactor

“…Rotating packed bed (RPB) reactors, which can generate a centrifugal force up to several hundred times gravity, have been widely applied into homogeneous and multiphase reactions . It has been recognized as a typical process intensification device for both mass transfer and mixing processes .…”

A three‐zone mass transfer model for a rotating packed bed

“…3,4 As a result, the mass transfer coefficient and micromixing efficiency of a RPB are up to 1-3 orders of magnitude in comparison with a traditional packed bed. [5][6][7] RPBs have been widely used for gas-liquid, liquid-liquid, and gas-liquid-solid systems, such as absorption 8 and distillation, 9 condensation reaction, 2 production of nanoparticles, 10 and catalytic hydrogenation. 11 The mass transfer performance in a RPB can be determined by experimental measurement and mass transfer model.…”