兰州石化泥油薄层干化特性及干化模型建构
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摘要
为实现炼化三泥的减量化和资源化利用,搭建薄层干化实验台;以兰州石化某炼厂炼化三泥为研究对象,实验研究干化过程的物料厚度、干化风速和干化温度三个主要因素对于干化效果的影响。在参数研究基础上,通过对实验数据进行模型拟合,得到模型参数与三个因素的关系。结果表明:当干化温度提高、干化风速增大、薄层厚度减小时,被干化的物料会在较短时间内达到干化平衡状态。干化温度和风速主要作用于干化的升速阶段和恒速阶段,薄层厚度主要作用于降速阶段。得到实验的最佳条件为干化温度120℃,干化风速2. 75 m/s,干化厚度3 mm。经过薄层干化后的样品含水率小于2%,体积明显减小;研磨后呈粉末状,基本无黏性,实现了减量化;也为资源化奠定基础。此外,利用Karathanos干化模型建立了扩散系数的对数与温度倒数的线性关系,计算出各工况下的活化能和扩散因子,为三泥的薄层干燥处置方案提供了技术指导。
In order to achieve the reduction and resource utilization of oily sludge,a thin-layer drying experiment platform was set up. Taking the refinery sludge of Lanzhou Petrochemical Company as the research object,the effects of material thickness,drying air velocity and drying temperature were studied experimentally. On the basis of parameter study,the relationship between model parameters and three factors is obtained by fitting the experimental data. The results show that when the drying temperature and drying wind speed increases,and the thickness of the thin layer is decreases,the dried material will reach the dry equilibrium state in a short time. The drying temperature and wind speed mainly act on the acceleration and constant speed stages of the drying,and the thickness of the thin layer mainly acts on the deceleration stage. The optimum conditions for the experiment were drying temperature of 120 ℃,drying wind speed of 2. 75 m/s,and drying thickness of 3 mm. After the thin layer is dried,the moisture content of the sample is less than 2%,the volume is obviously reduced,and it is powdery after grinding. It is basically non-sticky,and the reduction is realized,which also lays a foundation for resource utilization. In addition,the Karathanos drying model was used to establish the linear relationship between the logarithm of the diffusion coefficient and the reciprocal of the temperature,and the activation energy and diffusion factor under various working conditions were calculated,which provided technical guidance for the thin mud drying treatment scheme of the oily sludge.
In order to achieve the reduction and resource utilization of oily sludge,a thin-layer drying experiment platform was set up. Taking the refinery sludge of Lanzhou Petrochemical Company as the research object,the effects of material thickness,drying air velocity and drying temperature were studied experimentally. On the basis of parameter study,the relationship between model parameters and three factors is obtained by fitting the experimental data. The results show that when the drying temperature and drying wind speed increases,and the thickness of the thin layer is decreases,the dried material will reach the dry equilibrium state in a short time. The drying temperature and wind speed mainly act on the acceleration and constant speed stages of the drying,and the thickness of the thin layer mainly acts on the deceleration stage. The optimum conditions for the experiment were drying temperature of 120 ℃,drying wind speed of 2. 75 m/s,and drying thickness of 3 mm. After the thin layer is dried,the moisture content of the sample is less than 2%,the volume is obviously reduced,and it is powdery after grinding. It is basically non-sticky,and the reduction is realized,which also lays a foundation for resource utilization. In addition,the Karathanos drying model was used to establish the linear relationship between the logarithm of the diffusion coefficient and the reciprocal of the temperature,and the activation energy and diffusion factor under various working conditions were calculated,which provided technical guidance for the thin mud drying treatment scheme of the oily sludge.
引文
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2高文军.炼油厂“三泥”处理工艺技术改进[J].河南化工,2012,29(14):43-45Gao Wenjun.Technological improvement of“three sludge”treatment process in refinery[J].Henan Chemical Industry,2012,29(14):43-45
3徐科.微波辐照及电气浮法处理炼油厂“三泥”水相的研究[D].南京:南京理工大学,2002Xu Ke.Study on the treatment of the oily wastewater from refinery factory by microwave radiation and electro-floatation[D].Nanjing:Nanjing University of Science and Technology,2002
4宋薇,刘建国,聂永丰.含油污泥组成及其对热解特性的影响[J].环境科学,2008,29(7):2063-2067Song Wei,Liu Jianguo,Nie Yongfeng.Components of oil sludge and their influence on pyrolysis behaviors[J].Environmental Science,2008,29(7):2063-2067
5蒋培华,钟璟,孙晓娟,等.炼油厂“三泥”中污油的处理工艺研究[J].石油化工高等学校学报,2001,14(4):27-30Jiang Peihua,Zhong Jing,Sun Xiaojuan,et al.Treatment of flotation residue in oily sludge produced by oil refinery process[J].Journal of Petrochemical Universities,2001,14(4):27-30
6张雪玉.城市污水污泥干燥动力学特性影响因素的实验研究[D].北京:北京交通大学,2016Zhang Xueyu.Experimental study on influencing factors of municipal sewage sludge drying kinetics[D].Beijing:Beijing Jiaotong University,2016
7 Gao L,Geng W G,Xuan-You L,et al.Study on two-stage drying process for oil-sludge sand[J].Drying Technology&Equipment,2016,14(1):9-14
8王静静,王万福,于显水,等.含油污泥薄层干燥特性及动力学模型分析[J].油气田环境保护,2013,23(2):48-51Wang Jingjing,Wang Wanfu,Yu Xianshui,et al.Analysis of drying characteristics and dynamics model of oily sludge thin layer[J].Environmental Protection of Oil&Gas Fields,2013,23(2):48-51
9 Troncoso F.Drying kinetics of sludge from a wastewater treatment plant[J].Drying Technology,2004,22(9):2135-2150
10黄友旺.热风对流干燥过程中城市生活污泥薄层传热传质特性[D].北京:北京交通大学,2015Huang Youwang.Heat and mass transfer of sewage sludge thin-layer during hot air convective drying[D].Beijing:Beijing Jiaotong University,2015
11张绪坤,苏志伟,王学成,等.污泥过热蒸汽与热风薄层干燥的湿分扩散系数和活化能分析[J].农业工程学报,2013,29(22):226-235Zhang Xukun,Su Zhiwei,Wang Xuecheng,et al.Analysis of moisture diffusion and activation energy in superheated steam and hot air sludge thin layer drying[J].Transactions of the Chinese Society of Agricultural Engineering,2013,29(22):226-235
12岳莲,吴中华,聂海韬,等.城市污泥与木屑混合薄层干燥实验及动力学分析[J].干燥技术与设备,2013(5):51-57Yue Lian,Wu Zhonghua,Nie Haitao,et al.Thin layer drying characteristics and kinetics model of municipal sludge and sawdust mixture[J].Drying Technology and Equipment,2013(5):51-57