转速对油基钻屑热解炉温度场影响的数值模拟
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摘要
页岩气开采所产生的油基钻屑在采用热解法的处理过程中,为探究油基钻屑在回转窑内的温度场分布情况,采用Fluent软件对回转窑进行建模并对油基钻屑在窑内热解过程进行数值模拟。结果表明:当回转速度为0.02rad/s时,内部温度场较为均匀且物料温度较高,适宜油基钻屑的热解,转速过低或过高均会影响物料的均匀混合与升温速率;物料刚进入窑体内部时,温度有一个急剧攀升至660K的过程,其后温度变化较为平缓。结合模拟结果,选用适中的回转速度可提高油基钻屑热解温度,从而提高热解效果。
The oil-based drilling cuttings is the solid waste generated by the use of oil-based drilling fluids during exploitation of shale gas.As an efficient method of recycling cuttings,pyrolysis is widely used in production.To explore the temperature distribution of oilbased drilling cuttings in rotary kilns,simulation model was established with Fluent.The results showed that,when the rotational speed reached 0.02 rad/s,the internal temperature wasrelatively uniform while the material temperature was relatively high,which is suitable for pyrolysis.Overspeed of the rotation would affect the uniform mixing and heating rate of the cuttings.When the cuttings entered the kiln,its temperature climbed rapidly to 660 K,after that,the temperature variation wasrelatively slow.According to the simulation results,a moderate rotational speed should be decided to increase the pyrolysis temperature of oil-based drilling cuttings so as to guarantee the optimal pyrolysis effect.
The oil-based drilling cuttings is the solid waste generated by the use of oil-based drilling fluids during exploitation of shale gas.As an efficient method of recycling cuttings,pyrolysis is widely used in production.To explore the temperature distribution of oilbased drilling cuttings in rotary kilns,simulation model was established with Fluent.The results showed that,when the rotational speed reached 0.02 rad/s,the internal temperature wasrelatively uniform while the material temperature was relatively high,which is suitable for pyrolysis.Overspeed of the rotation would affect the uniform mixing and heating rate of the cuttings.When the cuttings entered the kiln,its temperature climbed rapidly to 660 K,after that,the temperature variation wasrelatively slow.According to the simulation results,a moderate rotational speed should be decided to increase the pyrolysis temperature of oil-based drilling cuttings so as to guarantee the optimal pyrolysis effect.
引文
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[3] 孙静文,许毓,刘晓辉,等.油基钻屑处理及资源回收技术进展[J].石油石化节能,2016,6(1):30-33.
[4] 魏彦林,吕雷,杨志刚,等.含油污泥回收处理技术进展[J].油田化学,2015,32(1):151-158.
[5] KARAYILDIRIM T,YANIK J,YUKSEL M,et al.Characteristion of products from pyrolysis of waste sludges[J].Fuel,2006,85(10):1498-1508.
[6] 巴玉鑫,王惠惠,吴小飞,等.热解装置对含油污泥热解产物的影响[J].油气田环境保护,2017,27(1):18-20.
[7] WANG Z,GUO Q,LIU X,et al.Low temperature pyrolysis of characteristics of oil sludge under various heating conditons.Energy&fuels,2007,21(2):957-962.
[8] SHUO CHENG.Progress in thermal analysis studies on the pyrolysis process of oil sludge[J].Thermochimica acta,2018(663):125-136.
[9] 张明.三维回转窑内物料流动及换热特性数值模拟[D].大连:大连理工大学,2014:22-25.
[10] 陈超,李水清,岳长涛,等.含油污泥回转式连续热解—质能平衡及产物分析[J].化工学报,2006,57(3):650-657.
[11] HUI LI.Thermal characteristics and kinetic calculation of castor oil pyrolysis[J].Procedia engineering,2017(205) :3711-3716.
[12] 张宏麟.水泥回转窑内部传热特性及流场分析[D].沈阳:沈阳工业大学,2012:52-55.