烟煤持续耗氧过程中自由基变化规律研究
Study on change of free radicals during continuous oxygen consumption of bituminous coal
-
摘要: 为了研究煤持续耗氧过程中自由基变化规律,选取4种不同变质程度的烟煤,采用电子顺磁共振仪,研究了在变温条件下不同烟煤从富氧到贫氧的持续耗氧过程中自由基的变化规律。实验结果表明:常温下随着煤变质程度的增加,煤中自由基的种类和浓度减少,自由基的对称性增大;随着煤粒径的减小,煤中自由基浓度增大,种类不变,对称性呈波动变化;粒径分布对煤中自由基、浓度、种类和对称性具有较大影响;当温度不断升高,氧气供给不断减小的情况下,煤中自由基浓度则有增有减,而自由基种类和对称性都呈下降趋势,不同煤种随温度变化的持续耗氧规律有所不同。Abstract: In order to study the change rule of free radicals in the process of continuous oxygen consumption of coal, four kinds of bituminous coals with different degrees of deterioration were selected and electron paramagnetic resonance apparatus was used to study the change rule of free radicals in the process of continuous oxygen consumption of different bituminous coals from oxygen-rich to oxygen-poor under the condition of variable temperatures. The experimental results show that the species and concentration of free radicals decrease and the symmetry of free radicals increases with the increase of coal metamorphism at room temperature; with the decrease of coal particle size, the concentration of free radical in coal increases, the type remains the same, and the symmetry fluctuates; particle size distribution has great influence on free radicals, concentration, type and symmetry of coal; when the temperature keeps increasing and the oxygen supply keeps decreasing, the concentration of free radicals in coal increases and decreases, while the type and symmetry of free radicals decrease. The continuous oxygen consumption of different types of coal varies with temperature.
-
Keywords:
- bituminous coal /
- free radical /
- temperature /
- degree of deterioration /
- particle size /
- spontaneous combustion
-
-
[1] 李好管.“十三五”规划关于中国能源、煤炭工业、煤炭深加工产业发展的政策导向(上)[J].煤化工,2017, 45(3):1-6. LI Haoguan. Policy orientation about development of China’s energy, coal industry and deep coal processing industry in the thirteenth five-year plan[J]. Coal Chemical Industry, 2017, 45(3): 1-6.
[2] 马腾,陈晓坤,翟小伟,等.基于官能团演化特性的煤氧化动力学研究[J].西安科技大学学报,2020,40(1):71-77. MA Teng, CHEN Xiaokun, ZHAI Xiaowei, et al. Kinetic analysis of coal oxidation based on evolution characteristics of functional groups[J]. Journal of Xi’an University of Science and Technology, 2020, 40(1): 71.
[3] 师吉林.巷道松散煤体自燃数值模拟研究[D].西安:西安科技大学,2012. [4] WEN H, YU Z, DENG J, et al. Spontaneous ignition characteristics of coal in alarge-scale furnace: An experimental and numerical investigation[J]. Applied Thermal Engineering, 2017, 114(2): 583-592. [5] 何飞,王德明,雷丹,等.煤低温氧化升温速率与自由基浓度的特性分析[J].煤矿安全,2011,42(8):15. HE Fei, WANG Deming, LEI Dan, et al. Characteristics analysis of temperature rise rate of coal oxidation at low temperature and free radicals concentrations[J]. Coal Mine Safety, 2011, 42(8): 15-18.
[6] 李增华.煤炭自燃的自由基反应机理[J].中国矿业大学学报,1996,25(3):111. LI Zenghua. Mechanism of free radical reaction in spontaneous combustion of coal[J]. Journal of China University of Mining and Technology, 1996, 25(3): 111.
[7] 黄庠永,姜秀民,张超群,等.颗粒粒径对煤表面羟基官能团的影响[J].燃烧科学与技术,2009,15(5):457-460. HUANG Xuyong, JIANG Xiumin, ZHANG Chaoqun, et al. Effect of particle size on hydroxyl groups of coal surface[J]. Journal of Combustion Science and Technology, 2009, 15(5): 457-460.
[8] 位爱竹,李增华,杨永良.破碎、氧化和光照对煤中自由基的影响分析[J].湖南科技大学学报(自然科学版),2006(4):19-22. WEI Aizhu, LI Zenghua, YANG Yongliang. Influence from fragmentation, oxidation and ultraviolet to free radical of coal[J]. Journal of Hunan University of Science and Technology(Natural Science Edition), 2006(4): 19-22.
[9] 罗道成,刘俊峰.不同反应条件对煤中自由基的影响[J].煤炭学报,2008,33(7):807-811. LUO Daocheng, LIU Junfeng. Effects of different reaction conditions on the free radicals in coal[J]. Journal of China Coal Society, 2008, 33(7): 807-811.
[10] 戴广龙.煤低温氧化过程中自由基浓度与气体产物之间的关系[J].煤炭学报,2012,37(1):122-126. DAI Guanglong. Relation between free radicals concentration and gas products in process of coal low temperature oxidation[J]. Journal of China Coal Society, 2012, 37(1): 122-126.
[11] 朱令起,刘聪,王福生.煤自燃过程中自由基变化规律特性研究[J].煤炭科学技术,2016,44(10):44. ZHU Lingqi, LIU Cong, WANG Fusheng. Study on variation law and features of free radicals in coal spontaneous combustion process[J]. Coal Science and Technology, 2016, 44(10): 44-47.
[12] 王福生,刘颖健,高东,等.煤自燃过程中自由基与指标气体释放规律[J].煤炭科学技术,2016,44(S1):72-74. WANG Fusheng, LIU Yingjian, GAO Dong, et al. Release law of free radicals and index gases in process of coal spontaneous combustion[J]. Coal Science and Technology, 2016, 44(S1): 72-74.
[13] 仲晓星,王德明,徐永亮,等.煤氧化过程中的自由基变化特性[J].煤炭学报,2010,35(6):960-963. ZHONG Xiaoxing, WANG Deming, XU Yongliang, et al. The variation characteristics of free radicals in coal oxidation[J]. Journal of China Coal Society, 2010, 35(6): 960-963.
[14] 董宪伟,温志超,王福生,等.基于电子顺磁共振的煤自燃阻化剂实验研究[J].中国科技论文,2017,12(21):2469-2473. DONG Xianwei, WEN Zhichao, WANG Fusheng, et al. Experimental study of coal spontaneous combustion inhibitor based on electron paramagnetic resonance[J].Chinese Science Paper, 2017, 12(21): 2469-2473.
[15] Deng J, Zhao J, Xiao Y, et al. Thermal analysis of the pyrolysis and oxidation behaviour of 1/3 coking coal[J]. Therm Anal Calorim, 2017, 129: 1-8. [16] 李增华,齐峰,杜长胜,等.基于吸氧量的煤低温氧化动力学参数测定[J].采矿与安全工程学报,2007(2):137-140. LI Zenghua, QI Feng, DU Changsheng, et al. Measurement of dynamic parameters of coal oxidation at low temperature based on oxygen consumption[J]. Journal of Mining & Safety Engineering, 2007, 24(2): 137-140.
[17] Lidiak, Barbarap, Ezejbw. Influence of thermal decomposition on paramagnetic centers in vitrinite[J]. Fuel Processing Technology, 2004, 85(4): 1585-1593. [18] 刘颖健.煤氧化过程中自由基—活性基团作用机理[D].唐山:华北理工大学,2016. [19] 王彩萍,王伟峰,邓军.不同煤种低温氧化过程指标气体变化规律研究[J].煤炭工程,2013,45(2):109. WANG Caiping, WANG Weifeng, DENG Jun. Study on index gas variation law of different coal during low temperature oxidation process[J]. Coal Engineering, 2013, 45(2): 109.
[20] Gao Z. Low temperature pyrolysis properties and kinetics of non-coking coal in Chinese western coals[J]. Journal of the Energy Institute, 2016, 89(4): 544. [21] 张嬿妮.煤氧化自燃微观特征及其宏观表征研究[D].西安:西安科技大学,2012. [22] 艾晴雪.煤自燃过程活性基团与自由基反应特性研究[D].唐山:华北理工大学,2018. [23] 秦小文.浸水风干煤体低温氧化特性研究[D].徐州:中国矿业大学,2015. [24] 邓军,赵婧昱,张嬿妮,等.煤样两次程序升温自燃特性对比实验研究[J].西安科技大学学报,2016,36(2):157-162. DENG Jun, ZHAO Jingyu, ZHANG Yinni, et al. Contrast experimental research on spontaneous combustion of oxidized-coals[J]. Journal of Xi’an University of Science and Technology, 2016, 36(2): 157-162.
[25] 肖旸.煤田火区煤岩体裂隙渗流的热—流—固多场耦合力学特性研究[D].西安:西安科技大学,2013. -
期刊类型引用(3)
1. 杨登峰，李小双，马天辉，谢生荣. 基于断裂力学的浅埋工作面过沟谷地形上坡段切顶机理分析. 矿业研究与开发. 2024(04): 97-106 . 
百度学术
2. 范亚奇，张新国，常啸，孟子轩，焦方树. 不同深度黄土微观特性对开采沉陷的影响研究. 煤矿安全. 2024(04): 143-151 . 本站查看
3. 吴孟函，侯健，张彦勤，冯浩波. 基于CATS模型的黄土丘陵小流域优势水土保持植物配比. 草地学报. 2023(08): 2455-2461 . 百度学术
其他类型引用(0)
计量
- 文章访问数: 30
- HTML全文浏览量: 0
- PDF下载量: 0
- 被引次数: 3
下载:
