方薪晖, 安海泉, 刘臻, 李烨, 冯子洋, 彭宝仔, 王永刚. 煤粉掺混煤液化残渣萃余物的气力输送压降特性研究[J]. 煤炭学报, 2020, 45(4). DOI: 10.13225/j.cnki.jccs.2020.0021
引用本文: 方薪晖, 安海泉, 刘臻, 李烨, 冯子洋, 彭宝仔, 王永刚. 煤粉掺混煤液化残渣萃余物的气力输送压降特性研究[J]. 煤炭学报, 2020, 45(4). DOI: 10.13225/j.cnki.jccs.2020.0021
FANG Xinhui, AN Haiquan, LIU Zhen, LI Ye, FENG Ziyang, PENG Baozai, WANG Yonggang. Experimental research on pressure drop in dense phase pneumatic conveying of pulverized coal blending extract residue of direct coal liquefaction residue[J]. Journal of China Coal Society, 2020, 45(4). DOI: 10.13225/j.cnki.jccs.2020.0021
Citation: FANG Xinhui, AN Haiquan, LIU Zhen, LI Ye, FENG Ziyang, PENG Baozai, WANG Yonggang. Experimental research on pressure drop in dense phase pneumatic conveying of pulverized coal blending extract residue of direct coal liquefaction residue[J]. Journal of China Coal Society, 2020, 45(4). DOI: 10.13225/j.cnki.jccs.2020.0021

煤粉掺混煤液化残渣萃余物的气力输送压降特性研究

Experimental research on pressure drop in dense phase pneumatic conveying of pulverized coal blending extract residue of direct coal liquefaction residue

  • 摘要: 为研究煤直接液化残渣萃余物与煤混合后的气力输送压降特性,本文在最大操作压力6MPa,输送管道内径DN25和DN15的气力输送装置上,针对两种粉体M1(煤粉)和M2(煤粉掺混20%萃余物的混合粉体)展开了多工况的实验研究。结果表明:掺混萃余物会导致水平直管的压降大小和压降波动性增大,且在低气速区域该现象更为明显;采用水力光滑管计算公式来计算气相摩擦因数,当表观气速大于8m/s时,压降计算值与实验值有较大误差,通过最小二乘法对气相压降进行优化计算后,得到DN25和DN15管道的壁面粗糙度分别为0.015mm和0.013mm,气相压降计算误差小于10%;通过量纲分析法得到颗粒相摩擦因数模型,M1和M2的压降计算值与实验值误差在30%以内;在低弗洛德数(Fr)下,M2的颗粒相摩擦因数明显高于M1,而随着Fr的增大,两者则趋向一致;气相压降是总压降中不可忽略的一部分,随着表观气速的增大,颗粒相压降占比逐渐减小;随着固气比的增大,颗粒相压降逐渐增大。

     

    Abstract: In order to study the pressure drop characteristics of high-pressure dense phase pneumatic conveying of mix- ing coal with coal liquefaction residue raffinate,this paper investigates the pressure drop characteristics of a horizontal straight pipe on a pneumatic conveying device with a maximum operating pressure of 6 MPa at the conveying pipe di- ameter of DN25 and DN15. The experimental study has been carried out under multiple operating conditions,and the results show that the blending extract residue has a significant effect on both the magnitude and fluctuation of the pres- sure drop of the horizontal straight pipe. The hydraulic smooth pipe calculation formula is used to calculate the gas phase friction coefficient,and the calculated pressure drop value in the high velocity region ( >8 m / s) of gas phase shows a large error between the calculated and measured value. The wall roughness of DN25 and DN15 pipes obtained by least squares regression is 0. 015 mm and 0. 013 mm respectively,and the calculation error of the gas phase pres- sure drop is less than 10% . The particle phase pressure drop is obtained by dimensional analysis,and the error between the calculated value of pressure drop of M1 and M2 and the experimental value is within 30% . At low Froude number,the particle phase friction coefficient of M2 is significantly higher than M1,and the two values tend to be i- dentical under high Froude number. The pressure drop of gas phase is a non-negligible part of the total pressure drop. As the superficial gas velocity increases,the proportion of particle pressure drop gradually decreases. As the solid-gas ratio increases,the proportion of pressure drop of particle phase increases.

     

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