Experimental Study on Simultaneous Desulfurization and Denitrification by DBD Combined with Wet Scrubbing

Liang Yang,Lin Lu,Yunkai Cai

doi:10.3390/app11188592

Abstract

A dielectric barrier discharge (DBD) reactor combined with a wet scrubbing tower was used to carry out an experimental study on desulfurization and denitrification. The effects of the packing type, packing height, spray density, mass fraction of the NaOH solution, discharge power in the DBD reactor, and simulated flue gas flow rate on the desulfurization and denitrification efficiency were analyzed, along with the influence weight of each factor, using orthogonal testing. The experimental results showed that SO2 was easily absorbed by the scrubbing solution, while the desulfurization efficiency remained at a high level (97–100%) during the experiment. The denitration efficiency was between 12 and 96% under various operating conditions. Denitration is the key problem in this system. The influence weights of the DBD power, simulated flue gas flow rate, mass fraction of the NaOH solution, spray density, packing type, and packing height on the denitration efficiency were 56.96%, 18.02%, 11.52%, 5.02%, 4.33%, and 4.16%, respectively. This paper can provide guidance to optimize the desulfurization and denitrification efficiency of this DBD reactor combined with a wet scrubbing system.

Highlights

Ocean-going ships undertake more than 90% of the global cargo transportation tasks; the pollutants in their exhaust emissions cause serious air pollution and endanger human health [1,2]
Selective catalyst reduction (SCR) is the main method used to remove NOx, the denitration efficiency of which can reach more than 90%; SO2 in ship exhausts will cause sulfur poisoning of the SCR catalyst and reduce the catalyst’s efficiency [4,5]
The effective way to avoid sulfur poisoning is to place the SCR system behind the wet desulfurization unit, the SCR system will face the problem of low exhaust temperature

Summary

Introduction

Ocean-going ships undertake more than 90% of the global cargo transportation tasks; the pollutants in their exhaust emissions (such as NOx and SOx ) cause serious air pollution and endanger human health [1,2]. Selective catalyst reduction (SCR) is the main method used to remove NOx , the denitration efficiency of which can reach more than 90%; SO2 in ship exhausts will cause sulfur poisoning of the SCR catalyst and reduce the catalyst’s efficiency [4,5]. The effective way to avoid sulfur poisoning is to place the SCR system behind the wet desulfurization unit, the SCR system will face the problem of low exhaust temperature

Methods

Results

Conclusion