在中尺度裝置中甲烷水合物的形成與減壓融解動態行為研究

• Main Author: 許碩修
• Language: Chinese
• Published: 2016
• Subjects: 海水; HEPES-Na（抑制劑）; tert-butanol（促進劑）; 水合物形成與分解; seawater; HEPES-Na; tert-Butanol; gas hydrates formation and decomposition; Methane hydrate
• Online Access: http://ir.lib.ntust.edu.tw/handle/987654321/64584; http://ir.lib.ntust.edu.tw/bitstream/987654321/64584/1/index.html

國立臺灣科技大學化學工程系 學位：博士 指導教授：李明哲 本研究組裝一套具有可視窗高壓設備（高壓釜內部體積約為1.6 L）以探討氣體水合物的形成與分解的動態變化行為。本裝置已用於觀察溫度介於275 K ~ 285 K之間的氣體水合物形成與減壓融解過程系列實驗。本系列實驗包含下列七大主項：純水+甲烷系統、海水+甲烷系統、海水+石英砂效應、純水+ HEPES-Na（抑制劑）+甲烷、純水+ tert-butanol（促進劑）+甲烷、水+二氧化碳系統和海水+二氧化碳系統。除了可從視窗目視觀察水合物的相變化，本裝置也提供氣體水合物在形成及在減壓融解過程中，高壓釜內不同位置的溫度與壓力，以及氣體流速隨時間的變化量，這些實驗證據可使吾人更加瞭解在特定之溫度與壓力下氣體水合物之生成與減壓融解的機制。 A new visual high-pressure apparatus, with an internal volume of about 1.6 L, was installed in the present study to investigate the dynamic behavior of gas hydrates formation and decomposition. A series of experiments have been conducted for observing the dynamic behavior of gas hydrate formation at temperatures from 275 K to 285 K and that of hydrate decomposition by depressurization. The experimental runs include seven different combinations : water + methane, seawater + methane, seawater + sand + methane, water + HEPES-Na (an inhibitor) + methane, water + tert-butanol (a promoter) + methane, water + carbon dioxide, and seawater + carbon dioxide. In addition to the visual observation of the phase transition through transparent windows, the temperature responses at different positions, pressure in the high-pressure cell, and gas flow rate varying with time provide experimental evidences to get more insight into the mechanism of gas hydrate formation at specific temperature and pressure, and that of the hydrates dissociation during the depressurization process.