Experimental and numerical studies on production scheme to improve energy efficiency of bitumen production through insitu oil-in-water (O/W) emulsion
Experimental and numerical studies on production scheme to improve energy efficiency of bitumen production through insitu oil-in-water (O/W) emulsion
复制标题
DOI：
10.1016/j.energy.2021.122700
复制
发表时间：
2022-02-15
期刊：
影响因子：
9
通讯作者：
Al-Nakhli, Ayman
中科院分区：
文献类型：
--
作者：
Alade, Olalekan S.;Mahmoud, Mohamed;Al-Nakhli, Ayman
乳化是指将沥青液滴分散在连续的水相中(如水包油(O/W)乳状液)，是一种有效的降低粘度的方法。这项研究的目的是利用原位乳化生产沥青的潜力，以提高能源效率。因此，采用聚乙烯醇(PVA)表面活性剂(含NaOH和乙醇添加剂)，在不同的沥青/PVA溶液比例，即不同比例下，制备了O/W乳液。70：30(RX1)、55：45(RX2)、40：60(RX3)。这些数据被纳入计算流体动力学(CFD)分析，以获得不同温度(30-150摄氏度)下的乳化反应参数。随后，在不同的注射温度(50、100和150℃)下进行了考虑O/W乳状液原位形成的数值模拟。并与215℃下常规注汽的结果进行了比较，乳化实验得到了明显的降粘效果。数值模拟表明，与注汽方法相比，该方法具有更高的油汽比(OSR)。最终，参照蒸汽注入(热效率，Delta E-ef=0.02 m(3)/GJ；沥青净产量=692m(3))，最有希望的操作是在150摄氏度下从RX3生产热效率，Delta E-ef=0.04 m(3)/GJ，净沥青产量为649 m(3)。(C)2021年爱思唯尔有限公司。保留所有权利。
Emulsification involving dispersion of bitumen droplets in a continuous aqueous phase (as oil-in-water (O/W) emulsion), is an efficient method of reducing the viscosity. The objective of this research is to harness the potential of insitu emulsification for production of bitumen to improve energy efficiency. Thus, O/W emulsion was prepared using poly vinyl alcohol (PVA) surfactant (with NaOH and ethanol additivities) at different ratios of bitumen: PVA solution viz. 70:30 (RX1), 55:45 (RX2), 40:60 (RX3). The data was incorporated in computational fluid dynamics (CFD) analysis to obtain emulsification reaction parameters at different temperatures (30-150 degrees C). Subsequently, numerical simulation considering insitu formation of O/W emulsion was performed at different injection temperatures (50, 100, and 150 degrees C). The results were compared with those of conventional steam injection at 215 degrees C. Significant viscosity reduction of bitumen was obtained from emulsification experiments. From numerical simulation, the proposed method resulted in higher oil: steam ratio (OSR) compared with steam injection method. Ultimately, with reference to steam injection (thermal efficiency, Delta E-eff = 0.02 m(3)/GJ; net bitumen production = 692 m(3)), the most promising operation is the production from RX3, at 150 degrees C, with thermal efficiency, Delta E-eff = 0.04 m(3)/GJ, and 649 m(3) net bitumen production. (c) 2021 Elsevier Ltd. All rights reserved.