改性干水材料配比对水合物法分离回收瓦斯动力学影响  

Impact of modified dry water material ratios on gas separation and recovery kinetics via the hydrate method

作　　者：张强 陈敏杰 薛广鑫 李元吉 ZHANG Qiang;CHEN Minjie;XUE Guangxin;LI Yuanji(School of Safety Engineering,Heilongjiang University of Science&Technology,Harbin 150022,China)

机构地区：[1]黑龙江科技大学安全工程学院,哈尔滨150022

出　　处：《安全与环境学报》2024年第9期3418-3428,共11页Journal of Safety and Environment

基　　金：黑龙江省自然科学基金项目(YQ2022E041)。

摘　　要：为增大水合物法分离回收低浓度煤矿瓦斯速率、提高瓦斯水合物含气量,采用四种质量分数的碳纳米管和铜粉分别与摩尔分数5.56%的四氢呋喃(Tetrahydrofuran,THF)复配对干水进行改性。以干水作为液相开展了5轮次瓦斯水合分离回收循环试验,探究改性干水对摩尔分数25%CH_(4)/67%N_(2)/8%O_(2)混合气分离回收动力学的影响,并考察改性干水的可重复利用性。结果表明,质量分数0.5%碳纳米管改性干水体系中瓦斯水合分离回收初始阶段反应速率最快[为1.007 mmol/(mol·h)],气体消耗量最大(为4.992 mmol/mol)。改性材料质量分数为1%时,改性干水可重复利用性最好。对比发现,质量分数10%结冷胶改性干水体系中瓦斯水合分离回收速度最快,可达1.264 mmol/(mol·h),在该体系中开展了压力驱动力优选试验,瓦斯水合分离回收动力学最优结果为6 MPa体系。To enhance the efficiency of separating and recovering low-concentration coal mine gas using the hydrate method and to boost the gas content of gas hydrate,dry water was modified by incorporating carbon nanotubes and copper powder at four different mass fractions.This modification was achieved through compounding with Tetrahydrofuran(THF)at a molar fraction of 5.56%.Five cycles of gas hydrate separation and recovery experiments were conducted using modified dry water as the liquid phase to explore its impact on the separation and recovery kinetics of a molar fraction 25%CH_(4)/67%N_(2)/8%O_(2) mixture.Building upon these experiments,the reusability of modified dry water was also investigated.The findings revealed that the system utilizing dry water modified with a 0.5%mass fraction of carbon nanotubes exhibited the most favorable kinetics in gas hydrate formation.Additionally,at the initial stage of gas hydrate separation,the reaction rate reached 1.007 mmol/(mol·h),and the amount of gas consumption reached 4.992 mmol/mol.These values are two and three times higher,respectively,compared to the unmodified dry water system.The modified dry water underwent partial dissociation during multiple cycles of gas hydrate formation.For the quaternary mixture comprising silica nanoparticles,water,modified material,and modified dry water,there exists an optimal ratio at which the kinetic target parameters of gas hydrate formation can be optimized.The optimal reusability of modified dry water was observed when the mass fraction of modified material was 1%.A comparison was conducted,revealing that the recovery rate through gas hydration separation reached up to 1.264 mmol/(mol·h)in the gellan gum-modified dry water system with a mass fraction of 10%.According to the pressure-driven preferential experiment conducted in this system,the kinetic parameters and the recovery outcome failed to exhibit a trend of gradual increase with a rise in the initial gas-phase pressure.Specifically,in the system with an initial gas-phase pressu

关 键 词：安全工程 改性干水 可重复利用性 瓦斯水合物 气体消耗量 

分 类 号：X93[环境科学与工程—安全科学]