Measurement and Prediction of Enthalpy for High-Pressure Gaseous Mixtures.

在本工作中，我们研制了一种新的量热计，并用IT.1测量了高压气体的热容。新型热量计的研制：本文研制的等温流量量热计主要由一个进料管、一个膨胀管、三个圆筒、两个加热器和一个保温器组成。在量热计的设计中，考虑了(1)等温系统的实现和(2)量热计的隔热。对于前者，使用了两个加热器，并独立控制。一个绕着膨胀管盘绕的手动加热器被控制在略低于入口气体温度的位置。另一个加热器缠绕在最内侧的圆筒周围，并预先设置好使用P.I.D控制器调整到入口气体温度。对于后者，入口管缠绕在圆柱体周围，以防止乳头通过它传递。量热计的大部分使用丙烯酸树脂和泡沫聚苯乙烯，以减少量热计的热容量，防止热量通过它传递。此外，改变膨胀管中颗粒的大小，以获得最佳的出口气体流量。N_2和CO_2的热焓测定：在298.15K和313.15K的温度和压力下测量了N_2的热焓。我们的数据与平滑后的曲线之间的平均偏差很小，为1.28J/mol。此外，我们的数据与文献值和雅各布森状态方程的计算结果符合得很好。对于CO_2.3也取得了较好的结果。混合物的热焓测定：在温度为298.15K，压力分别为1.0、1.5和2.0 MPa的条件下，测定了N_2和CO_2混合物的热焓。我们的计算结果与BWRS状态方程的计算结果吻合较好。

In the present work, a new calorimeter was developed and enthalpies of high-pressure gases were measured using it.1. Development of a new calorimeter: The isothermal flow calorimeter developed in this work mainly consists of an inlet tube, an expansion tube, three cylinders, two heaters and a thermal insulator. In the design of the calorimeter, attention was given to (1) achienement of an isothermal system and (2) thermal insulation of the calormeter. For the former, two heaters were used and were controlled independently. a manually operated heater coiled arount the expansion tube was controlled slightly below the inlet gas temperature. Another heater was coiled around the cylinder of the most interior side and prerated to adjust to the inlet gas temperature using a P.I.D controller. For the latter, the inlet tube was coiled around the cylinders to prevent teat transfer through it Acrylic resin and foam polystyrene were used in the greater part of the calorimeter to reduce the heat capacity of the calorimeter and to prevent heat transfer through it. Moreover, the size of particles in the expansion tube was varied to obtain an optimum flow rate of the outlet gas.2. Measurement of enthalpies for N_2 and CO_2: Enthalpy measurements for N_2 were performed at temperatures 298.15K and 313.15K and pressures up to 5MPa. Average deviation between our data and their smoothed curve was found to be a very small value, 1.28J/mol. In addition, our data is in excellent agreement with literature values and with calculations by Jacobsen's equation of state. Also good results were obtained for CO_2.3. Measurement of enthalpies for a mixture: Enthalpies were measured for a the mixture of N_2 and CO_2 at a temperature of 298.15K and pressures 1.0MPa, 1.5Pa and 2.0MPa. Good agreement was obtained between our results and calculations by BWRS equation of state.