Koech Lawrence, Everson Raymond C, Hattingh Burgert, Rutto Hilary, Lerotholi Letsabisa, Neomagus Hein Wjp
Eskom Power Plant Engineering Institute (EPPEI) Specialization Centre for Emission Control, School of Chemical and Minerals Engineering, Centre of Excellence in Carbon-based Fuels, North-West University, Private Bag X6001, Potchefstroom 2520, South Africa.
Department of Chemical and Metallurgical Engineering, Vaal University of Technology, Vanderbijlpark Campus, Private Bag X021, Vanderbijlpark 1900, South Africa.
ACS Omega. 2023 Jun 23;8(26):23401-23411. doi: 10.1021/acsomega.3c00064. eCollection 2023 Jul 4.
This study presents the findings of an investigation involving the absorption of SO from flue gases, using three different sorbents, in a spray dryer. Experimentation involved the evaluation of three sorbents, i.e., hydrated lime (Ca[OH]), limestone (CaCO), and trona (NaCO·NaHCO·2HO), and their relevant properties, for flue gas desulfurization by spray dry scrubbing. Experiments were conducted to explore the effects of spray characteristics in the spray drying scrubber on SO removal efficiency using the selected sorbents. The ranges of various operating parameters were considered, including the stoichiometric molar ratio of (1.0-2.5), the inlet gas phase temperature of (120-180 °C), and an inlet SO concentration of 1000 ppm. The use of trona gave better SO removal characteristics; a high SO removal efficiency of 94% was recorded at an inlet gas phase temperature of 120 °C and a stoichiometric molar ratio of 1.5. Under the same operating conditions, Ca[OH] and CaCO gave 82 and 76% SO removal efficiency, respectively. Analysis of the desulfurization products by X-ray fluorescence (XRF) and Fourier transform infrared (FTIR) spectroscopy revealed the presence of CaSO/NaSO, a product of the semidry desulfurization reaction. A significant proportion of unreacted sorbent was observed when Ca[OH] and CaCO sorbents were used at a stoichiometric ratio of 2.0. Trona also gave the highest degree of conversion (96%) at a stoichiometric molar ratio of 1.0. Ca[OH] and CaCO gave 63 and 59%, respectively, under the same operating conditions.
本研究介绍了一项在喷雾干燥器中使用三种不同吸附剂对烟道气中二氧化硫（SO）吸收情况的调查结果。实验涉及对三种吸附剂，即熟石灰（Ca[OH]）、石灰石（CaCO）和天然碱（NaCO·NaHCO·2HO）及其相关特性进行评估，以用于喷雾干燥洗涤法进行烟道气脱硫。进行实验以探究喷雾干燥洗涤器中的喷雾特性对使用选定吸附剂时SO去除效率的影响。考虑了各种操作参数的范围，包括化学计量摩尔比为（1.0 - 2.5）、进气相温度为（120 - 180 °C）以及进气SO浓度为1000 ppm。使用天然碱具有更好的SO去除特性；在进气相温度为120 °C且化学计量摩尔比为1.5时，记录到SO去除效率高达94%。在相同操作条件下，Ca[OH]和CaCO的SO去除效率分别为82%和76%。通过X射线荧光光谱（XRF）和傅里叶变换红外光谱（FTIR）对脱硫产物进行分析，结果显示存在CaSO/NaSO，这是半干法脱硫反应的产物。当Ca[OH]和CaCO吸附剂以化学计量比2.0使用时，观察到有相当比例的未反应吸附剂。在化学计量摩尔比为1.0时，天然碱的转化率也最高（96%）。在相同操作条件下，Ca[OH]和CaCO的转化率分别为63%和59%。
