Ruochen Wu , Edgar Carrejo , Md Sumon Reza , Ethan Woods , Seyedamin Razavi , Sunkyu Park , Fanxing Li , William Joe Sagues
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For the first time, a model-fitting method is used to determine the kinetic parameters for lime mud calcination under a wide range of temperatures (550 °C–1250 °C) and under different concentrations of CO<sub>2</sub> (0 %, 15 %, 50 %, and 90 %). A kinetic model is developed that accurately predicts the reaction rates as a function of temperature and CO<sub>2</sub> concentration. The apparent activation of energy for lime mud calcination is elevated under a high CO<sub>2</sub> environment. Relative to inert gas (N<sub>2</sub>, Ar), the temperature window for calcination is much smaller under high CO<sub>2</sub> environments. The presence of Na in lime mud does not seem to affect calcination under a high CO<sub>2</sub> environment. 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引用次数: 0
摘要
生物质化学制浆涉及通过煅烧石灰泥回收钙,石灰泥主要由碳酸钙(CaCO3)组成。石灰泥在高温下分解生成氧化钙(CaO)和二氧化碳(CO2),其动力学受二氧化碳分压和温度的影响很大。氧化燃料燃烧和电气化石灰窑煅烧石灰泥是生物质制浆行业中这种高污染操作脱碳的有效方法。然而,全氧燃烧和电气化煅烧过程中的高浓度二氧化碳会改变石灰泥的动力学和整体反应性。该研究首次采用模型拟合方法,确定了石灰泥在不同温度范围(550 ℃-1250 ℃)和不同二氧化碳浓度(0%、15%、50% 和 90%)下的煅烧动力学参数。建立的动力学模型可以准确预测反应速率与温度和二氧化碳浓度的函数关系。在高二氧化碳环境下,石灰泥煅烧的表观活化能升高。与惰性气体(N2、Ar)相比,高二氧化碳环境下的煅烧温度窗口要小得多。在高二氧化碳环境下,石灰泥中 Na 的存在似乎不会影响煅烧。最后,颗粒大小的变化对高二氧化碳环境下的煅烧没有显著影响。
Kinetic assessment of pulp mill-derived lime mud calcination in high CO2 atmosphere
The chemical pulping of biomass involves the recycling of calcium through the calcination of lime mud, which is mostly comprised of calcium carbonate (CaCO3). Lime mud decomposes under elevated temperatures to generate calcium oxide (CaO) and carbon dioxide (CO2), the kinetics of which are strongly influenced by the CO2 partial pressure and temperature. Oxy-fuel combustion and electrified lime kilns for lime mud calcination are intriguing methods to decarbonize this highly polluting operation within the biomass pulping industry. However, the high CO2 concentration in oxy-fuel and electrified calcination processes alters the kinetics and overall reactivity of lime mud. For the first time, a model-fitting method is used to determine the kinetic parameters for lime mud calcination under a wide range of temperatures (550 °C–1250 °C) and under different concentrations of CO2 (0 %, 15 %, 50 %, and 90 %). A kinetic model is developed that accurately predicts the reaction rates as a function of temperature and CO2 concentration. The apparent activation of energy for lime mud calcination is elevated under a high CO2 environment. Relative to inert gas (N2, Ar), the temperature window for calcination is much smaller under high CO2 environments. The presence of Na in lime mud does not seem to affect calcination under a high CO2 environment. Finally, particle size variation does not have a significant effect on calcination under a high CO2 environment.
期刊介绍:
The exploration of energy sources remains a critical matter of study. For the past nine decades, fuel has consistently held the forefront in primary research efforts within the field of energy science. This area of investigation encompasses a wide range of subjects, with a particular emphasis on emerging concerns like environmental factors and pollution.