Combustion kinetics study of oil shale semi-coke

doi:10.11949/j.issn.0438-1157.20190099

Abstract

Abstract:

Combustion kinetics is the basis for studying the combustion characteristics of oil shale semi-coke particles. Thermal gravimetric analyzer (TGA) was used to conduct isothermal combustion experiments of oil shale semi-coke. Effects of combustion temperature and oxygen concentration on kinetics of oil shale semi-coke combustion were analyzed. Higher combustion temperature and oxygen concentration would lead to faster combustion rate. A kinetic model considering oxygen concentration effects was developed. It was found that the combustion rate of oil shale semi-coke is proportional to oxygen concentration to the 0.97 power. The kinetic model yielded good agreements with the experiments results, and could provide a base for further investigation on the combustion of large oil shale semi-coke particles.

Key words: oil shale semi-coke, fuel, combustion, kinetics, model

摘要：

燃烧动力学是研究油页岩半焦颗粒燃烧特性的基础。利用热重分析仪对油页岩半焦进行了恒温燃烧实验研究，在排除外扩散影响的基础上，分析了燃烧温度、氧气浓度对油页岩半焦燃烧过程的影响。在实验范围内，氧气浓度和燃烧温度均能对油页岩半焦燃烧速率产生重要影响，更高的氧气浓度和燃烧温度可以加快油页岩半焦燃烧速率。结合实验结果，建立了考虑氧气浓度影响的油页岩半焦燃烧动力学模型，发现油页岩半焦燃烧速率与氧气浓度的0.97次方呈线性关系。模型计算结果与实验结果符合较好，为进一步研究油页岩半焦大颗粒燃烧特性提供了燃烧动力学基础。

关键词: 油页岩半焦, 燃料, 燃烧, 动力学, 模型

CLC Number:

TQ 028.8

Yiqun HUANG, Man ZHANG, Miao MIAO, Boyu DENG, Jin CAI, Yuxin WU, Junfu LYU, Yan JIN, Hairui YANG. Combustion kinetics study of oil shale semi-coke[J]. CIESC Journal, 2019, 70(8): 3033-3039.

黄逸群, 张缦, 苗苗, 邓博宇, 蔡晋, 吴玉新, 吕俊复, 金燕, 杨海瑞. 油页岩半焦燃烧动力学研究[J]. 化工学报, 2019, 70(8): 3033-3039.

Figures/Tables 11

Table 1 Proximate analysis and heat value of Huadian oil shale semicoke used in experiments

样品	工业分析/%				Q_ar,net/(kJ/kg)
样品	M_ar	A_ar	V_ar	FC_ar	Q_ar,net/(kJ/kg)
桦甸油页岩	7.06	62.08	26.60	4.26	9517.9
桦甸油页岩半焦	0.64	83.14	5.74	10.48	3767.2

Fig.1 Typical heating and mass loss curves in experiments（YO2=18.9%, T=700℃, flow rate=100 ml/min）

Fig.2 Effects of gas flow rate on oil shale semicoke combustion（YO2=18.9%，T=800℃）

Fig.3 Effects of combustion temperature on oil shale semicoke combustion (YO2=12.6%)

Fig.4 Effects of oxygen concentration on oil shale semicoke combustion (T =800℃)

Table 2 Kinetic model parameters

燃烧温度/℃	氧气浓度/(mol/m³)	n	m	k
800	2.178	0.995	1.115	0.112
	1.936	0.926	1.115	0.112
	1.694	0.774	1.115	0.112
	1.452	0.703	1.115	0.112
750	2.277	0.790	0.850	0.093
	2.024	0.655	0.850	0.093
	1.771	0.473	0.850	0.093
	1.518	0.398	0.850	0.093
700	2.394	0.686	0.815	0.084
	2.128	0.609	0.815	0.084
	1.862	0.496	0.815	0.084
	1.596	0.557	0.815	0.084
650	2.529	1.019	1.149	0.060
	2.248	0.782	1.149	0.060
	1.967	0.805	1.149	0.060
	1.686	0.579	1.149	0.060
600	2.673	1.055	0.897	0.055
	2.376	0.688	0.897	0.055
	2.079	0.743	0.897	0.055
	1.782	0.503	0.897	0.055

Fig.5 Regression results of reaction rate constant

Fig.8 Comparison between model prediction and experiment results (T=800℃，YO2=18.9%)

Fig.6 Comparison between model prediction and experiment results (T=700℃, YO2=12.6%)

Fig.7 Comparison between model prediction and experiment results (T=750℃，YO2=16.8%)

Fig.9 Comparison between Eq.(9) and Eq.(10)

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