超临界水射流焦汤系数计算与节流过程降温效果分析
发布时间:2018-08-21 10:12
【摘要】:高温流体通过喷嘴是节流流动的过程,会引起流体内部温度的变化,将影响高温射流冲击力与热裂解效应等。应用超临界水物性方程与焦汤系数的定义公式,推导出了射流通过喷嘴过程的焦耳汤姆逊系数的求解公式,并编制程序迭代求解,得到不同参数条件下焦耳汤姆逊系数分布特性与变化规律,并采用焦汤系数计算公式,计算得到不同参数下过喷嘴节流过程中降低温度值的变化规律。结果表明,在25~65 MPa和650~1 000 K的条件下,焦耳汤姆逊系数为正,随着反应腔内温度的增加,焦耳汤姆逊系数先增大后减小,在文中条件下的最大值为4.92;而随着反应腔内压力的增加,焦耳汤姆逊系数降低,在65MPa,650 K条件下取得最小值0.22。焦汤效应的最大值均出现在过热蒸汽区,且随着温度的增加,最大值偏离分界线。在射流喷射过程中,温度压力降低值不可忽略,文中条件下最大可达73.5 K,应当合理设置反应腔内温度压力值,降低高温射流通过喷嘴过程的温度损失。
[Abstract]:The high temperature fluid passing through the nozzle is a throttle flow process, which will cause the change of the internal temperature of the fluid, which will affect the impact force of the high temperature jet and the effect of pyrolysis, etc. Based on the supercritical water property equation and the definition formula of the coke soup coefficient, the solution formula of the joule Thomson coefficient in the process of jet passing through the nozzle is derived, and the program is programmed to solve the problem iteratively. The distribution and variation of the Thomson coefficient of Joule under different parameters are obtained. The variation of temperature during throttling of the nozzle under different parameters is calculated by using the formula of coke soup coefficient. The results show that the Thomson coefficient of Joule is positive under the conditions of 25 MPa and 650 K. With the increase of temperature in the reaction chamber, the Thomson coefficient of Joule increases first and then decreases. The maximum value is 4.92, and the minimum value is 0.22 at 65MPA ~ 650K with the increase of pressure in the reaction chamber, the Joule Thomson coefficient decreases. The maximum value of Jiaotang effect appears in the superheated steam region and deviates from the dividing line with the increase of temperature. In the jet injection process, the temperature and pressure decrease can not be ignored, and the maximum temperature pressure in the reaction chamber should be set reasonably to reduce the temperature loss in the process of high temperature jet passing through the nozzle.
【作者单位】: 油气资源与探测国家重点实验室;中国石油大学(北京)石油工程学院;
【基金】:国家自然科学基金项目“深层高温高压油气井安全高效钻完井基础研究”(编号:U1562212);“高温射流冲击-热裂解耦合破岩机理与实验研究”(编号:51504272) 中国石油科技创新基金研究项目“热力射流冲击-裂解耦合破岩机理研究”(编号:2015D-5006-0308)
【分类号】:TE21
,
本文编号:2195381
[Abstract]:The high temperature fluid passing through the nozzle is a throttle flow process, which will cause the change of the internal temperature of the fluid, which will affect the impact force of the high temperature jet and the effect of pyrolysis, etc. Based on the supercritical water property equation and the definition formula of the coke soup coefficient, the solution formula of the joule Thomson coefficient in the process of jet passing through the nozzle is derived, and the program is programmed to solve the problem iteratively. The distribution and variation of the Thomson coefficient of Joule under different parameters are obtained. The variation of temperature during throttling of the nozzle under different parameters is calculated by using the formula of coke soup coefficient. The results show that the Thomson coefficient of Joule is positive under the conditions of 25 MPa and 650 K. With the increase of temperature in the reaction chamber, the Thomson coefficient of Joule increases first and then decreases. The maximum value is 4.92, and the minimum value is 0.22 at 65MPA ~ 650K with the increase of pressure in the reaction chamber, the Joule Thomson coefficient decreases. The maximum value of Jiaotang effect appears in the superheated steam region and deviates from the dividing line with the increase of temperature. In the jet injection process, the temperature and pressure decrease can not be ignored, and the maximum temperature pressure in the reaction chamber should be set reasonably to reduce the temperature loss in the process of high temperature jet passing through the nozzle.
【作者单位】: 油气资源与探测国家重点实验室;中国石油大学(北京)石油工程学院;
【基金】:国家自然科学基金项目“深层高温高压油气井安全高效钻完井基础研究”(编号:U1562212);“高温射流冲击-热裂解耦合破岩机理与实验研究”(编号:51504272) 中国石油科技创新基金研究项目“热力射流冲击-裂解耦合破岩机理研究”(编号:2015D-5006-0308)
【分类号】:TE21
,
本文编号:2195381
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