Numerical optimisation on the retrofitting of oxy-coal combustion in cement rotary kiln

被引：0

作者：

Huang, Guanshuo ^{[1
]}

Zhou, Yuegui ^{[2
]}

机构：

[1] SJTU Paris Elite Institute of Technology, Shanghai Jiao Tong University, Shanghai

[2] Institute of Thermal Energy Engineering, School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai

来源：

Meitan Xuebao/Journal of the China Coal Society | 2024年 / 49卷 / 12期

关键词：

cement rotary kiln; heat transfer characteristics; numerical simulation; oxy-coal combustion; oxygen distribution method;

D O I：

10.13225/j.cnki.jccs.2023.1592

中图分类号：

学科分类号：

摘要：

Cement production is a high carbon dioxide emission process, where carbon emissions from coal combustion constitute a significant part of the carbon emissions from cement rotary kilns. The advantages of oxy-fuel combustion technology in carbon capture and utilization in power station boilers have gained a widespread attention for its application in industrial furnaces. Previous researchers have investigated the concentration of components inside the kiln and the combustion characteristics after the retrofit of oxy-fuel combustion in cement rotary kilns. However, the method of matching the heat transfer characteristics after the retrofit of oxy-fuel combustion in the cement rotary kilns with the original air atmosphere has not been well studied. In order to obtain the optimal strategy for the retrofitting cement rotary kilns with oxyfuel combustion while ensuring cement production quality, a three-dimensional modeling of oxy-coal combustion in a 500 kW cement rotary kiln combustion test furnace was carried out using the CFD software. The effects of total oxygen concentration (25%-35%), the oxygen distribution methods of primary and secondary streams under constant total oxygen concentration, and secondary stream preheating temperature (650-950 ℃) on heat transfer characteristics and flame length in the furnace were studied. The simulation results showed that under the oxy-fuel combustion atmosphere, the flame length at different total oxygen concentrations increased by 5%-8% compared to the air atmosphere. The peak temperature and heat flux in the furnace significantly increased with the increase of total oxygen concentration, and the total heat flux and peak temperature in the furnace were the same as those in the air atmosphere when the total oxygen concentration was 29% and 35% respectively. Keeping the total oxygen concentration at 29%, changing the oxygen distribution method of primary and secondary streams, the change range of the difference between the total heat flux and the heat flux under the air atmosphere was within 3% as the oxygen concentration of primary stream increased from 0 to 80%. And with the oxygen concentration of primary stream at 60%, while ensuring that the total heat flux was basically the same as that under the air atmosphere, the difference in the along-furnace heat flux from the air atmosphere could be further reduced. At a total oxygen concentration of 29% and a primary stream oxygen concentration of 60%, when the secondary stream temperature increased from 650 ℃ to 950 ℃, the total heat flux and flame length increased by 16% and 4% respectively, and when the secondary stream temperature was 720-760 ℃, it could achieve the same total heat flux match in the kiln as the air atmosphere. © 2024 China Coal Society. All rights reserved.

引用

页码：4938 / 4945

页数：7

共 19 条

[1]

ZHU Shuhan, LU Yilei, WANG Songwei, Et al., Characteristics and reduction potential of carbon dioxide emission in China’s cement industry from 2020 to 2050[J], Acta Scientiae Circumstantiae, 44, 2, pp. 453-463, (2024)

[2]

HE Jinyu, HE Jie, WANG Yutao, Et al., Pathway of carbon emissions peak for cement industry in China[J], Research of Environmental Sciences, 35, 2, pp. 347-355, (2022)

[3]

LIU Jun, YUAN Xin, CHEN Heng, Et al., Study on economic assessment and improvement for large-scale thermal power CCUS applications[J], Journal of Chinese Society of Power Engineering, 43, 10, pp. 1316-1325, (2023)

[4]

WANG Xinpin, Latest research progress of CCUS in world cement industry, Cement, 2021, 3, pp. 1-7

[5]

JORDAL K, VOLDSUND M, STORSET S, Et al., CEMCAP–making CO2 capture retrofittable to cement plants[J], Energy Procedia, 114, pp. 6175-6180, (2017)

[6]

PLAZA M G, MARTINEZ S, RUBIERA F., CO2 capture, use, and storage in the cement industry：State of the art and expectations[J], Energies, 13, 21, (2020)

[7]

KANG Yu, WU Tao, XU Lianchun, Analysis of several oxygen-rich combustion modes in cement industry[J], Cement, 2023, 7, pp. 31-35

[8]

GERBELOVA H, VAN DER SPEK M, SCHAKEL W., Feasibility assessment of CO2 capture retrofitted to an existing cement plant：Post-combustion vs. oxy-fuel combustion technology[J], Energy Procedia, 114, pp. 6141-6149, (2017)

[9]

FARIA D G, CARVALHO M M O, NETO M R V, Et al., Integrating oxy-fuel combustion and power-to-gas in the cement industry：A process modeling and simulation study[J], International Journal of Greenhouse Gas Control, 114, (2022)

[10]

CARRASCO MALDONADO F, HORNBERGER M, MAIER J, Et al., Oxyfuel kiln burner tests for a CO2-free cement plant[C], 14th Greenhouse Gas Control Technologies Conference, pp. 21-26, (2018)

← 1 2 →