超重力场下络合铁法脱硫过程传质模型研究

H_2S是一种有毒有害气体,故天然气在使用之前必须进行脱硫处理。而超重力旋转填料床因其在巨大的剪切力作用下强化了传质,大大增加了设备的生产能力,且装置尺寸远远小于传统塔设备。超重力技术与氧化还原法结合在天然气脱硫领域具有较好的应用价值。因此,建立一个实用可靠的传质系数模型,对超重力技术脱硫的研究具有重要意义。用CH_4和H_2S的混合气模拟含硫天然气,并在某中试装置上用络合铁氧化还原法进行脱硫。根据所得的数据及旋转填料床中气液接触的特性,包括气体流量、液体流量、转子转速对体积传质系数的影响,采用Matlab进行相关数据拟合分析,得到传质系数经验模型。对经验模型进行分析对比,根据超重力装置气液传质的特性对经验模型进行了改进,得到最终的传质系数经验模型。最后,将建立的传质系数经验模型与实验得到的数据进行对比验证。经分析对比,模型与实验数据吻合程度较高,平均偏差仅为0.12%,且该模型可以外推到其他体积与该超重力装置近似的装置,但气体流量应为1~10 m~3/h,液体流量为0.1~1 m~3/h,转速为100~1 500r/min。

Research on mass transferring model of the chelated iron desulfurization under high gravity field

As the toxicity of H₂S in natural gas, desulfurization is necessary before the use of natural gas. Because of the huge shear stress of rotating packed bed, it will greatly improve the transfer rate coefficient and increase the production capacity of the device. The device size is much smaller than conventional tower. High gravity technology combined with redox has good application value in the field of natural gas desulfurization. Therefore establishing a practical and reliable mass transfer coefficient model is important for desulfurization of high gravity technology. The data in a pilot plant by chelated iron desulfurization redox has been got with the mixture of methane and hydrogen sulfide simulations of natural gas. According to the data and characteristics of gas-liquid contact in rotating packed bed, the effect of gas flow rate, liquid flow rate and rotor speed on volumetric mass transfer coefficient were studied. Using Matlab to fit analysis related data, the empirical models of mass transfer coefficient were obtained. Finally, comparing the mass transfer coefficient empirical model and experimental data, the analysis and comparison results showed that the model has high degree of agreement with the experimental data, and the average deviation is only 0.12%. The model can be extrapolated to other similar device which has similar volume with the high gravity device, but the gas flow should be in the range of 1-10 m³/h, the liquid flow of 0.1-1 m³/h, and the speed of 100-1 500 r/min.