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首页> 外文学位 >DEVELOPMENT OF AN AUTOMATED, HIGH PRESSURE HEAT FLUX CALORIMETER AND ITS APPLICATION TO MEASURE THE HEAT OF DISSOCIATION OF METHANE HYDRATE.
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DEVELOPMENT OF AN AUTOMATED, HIGH PRESSURE HEAT FLUX CALORIMETER AND ITS APPLICATION TO MEASURE THE HEAT OF DISSOCIATION OF METHANE HYDRATE.

机译：自动化高压通量量热仪的研制及其在甲烷水合物分解热测量中的应用。

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A new versatile high pressure Heat Flux calorimeter has been developed and used to measure the heat of dissociation of methane hydrate. The calorimeter is completely automated, with an operating temperature range of {dollar}-50spcirc{dollar}C to 250{dollar}spcirc{dollar}C. It is a twin cell design with one liter sample volumes rated to 10,000 PSI. One sample cell is fitted with a magnetically driven stirrer and an internal electrical conductivity cell. The stirrer is used to assist in hydrate formation and the electrical conductivity cell is used to track hydrate formation.; The calorimeter has been calibrated both electrically and chemically and has been shown to have a sensitivity of 790 {dollar}mu{dollar}Volts/Watt at 298 K. It can be operated in either isothermal or scanning temperature modes but has been used only in isothermal mode for the work reported here. Measurements were made of the heat of dissociation of methane hydrate at 5{dollar}spcirc{dollar}C, 43.00 atm and 10{dollar}spcirc{dollar}C, 72.54 atm. They were found to be, respectively, 13,770 and 12,716 calories per gmole of methane released. The associated pressures of 43.00, and 72.54 atm are those of the three-phase (liquid water, hydrate, methane gas) equilibrium conditions for the two temperatures.; Hydrate dissociation was accomplished by isothermally expanding the system volume. The rate of volume increase was controlled to match the gas expansion from the hydrate crystal in such a way as to maintain a relatively constant system pressure throughout the dissociation. This method not only simplified dissociation heat calculations, it also proved to be a very accurate means of identifying hydrate dissociation conditions.
机译：已经开发出一种新型的多功能高压热通量量热仪，并用于测量甲烷水合物的分解热。量热仪是完全自动化的，工作温度范围为-50spcirc {dollar} C至250 {dollar} spcirc {dollar} C。它是双池设计，一升样品量达到10,000 PSI。一个样品池装有一个磁力搅拌器和一个内部电导池。搅拌器用于协助水合物的形成，电导池用于追踪水合物的形成。量热仪已经过电气和化学校准，显示在298 K时的灵敏度为790 {μm}美元/伏特。它可以在等温或扫描温度模式下运行，但仅用于等温模式用于此处报告的工作。在5spspcirc {dollar} C，43.00atm和10 {spcirc {dollar} C，72.54atm下测量甲烷水合物的离解热。发现它们每释放一摩尔甲烷分别有13,770和12,716卡路里的热量。相关的压力43.00和72.54 atm是这两个温度的三相（液态水，水合物，甲烷气体）平衡条件的压力。水合物的解离是通过等温扩展系统体积来完成的。控制体积增加的速率以匹配来自水合物晶体的气体膨胀，从而在整个解离过程中保持相对恒定的系统压力。该方法不仅简化了离解热的计算，而且还被证明是识别水合物离解条件的非常准确的方法。

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