توضیحات
ABSTRACT
This study examines the effects of two additive including hydroxyethyl cellulose (HEC) and sodium dodecyl sulfate (SDS) for increasing stability and gas content of natural gas hydrates. SDS can used as a hydrate promoter and HEC as a stabilizer. A high-pressure reactor in a laboratory- scale is used for to measure hydrate formation rate and stability. Hydrate stability tests were performed at temperature of -5 °C and pressure 15 bar. Induction time was obtained around 40 minutes at an optimum value of SDS.
INTRODUCTION
Natural gas is a worldwide major energy source. The sources of natural gas are often located very far away from the final consumer, that the development of efficient of natural gas transport and storage technologies are also a major concern. Hydrates are of interest in industries, especially in the production and processing of natural gas and oil. Hydrates are composed of water and guest molecules. Decreasing the pressure over the hydrates leads to their decomposition, because this is an endothermic process. Stern paid specific attention to the stabilization f methane hydrates over the equilibrium temperature and under atmospheric pressure, using pressure release methods. The stability of hydrates is defined by their inherent phase diagrams. Gas hydrates have high stabilities at high pressures (e.g. 150 bar) and low temperatures (e.g. 4° C.). It should also be noted that the pressure should be adjusted with using the same gases as for the desired hydrates in order not to disrupt the thermodynamic equilibrium of the existing phases. Given that the phase boundary curves of gas hydrates are of exponential nature, the so-called hydrate formation zone is much wider at higher pressures. On the other hand, although the formation of hydrates at high pressures and low temperatures (e.g. 250 bar, and 4° C.) is favorable, transportation of gases in hydrates under such high pressures can be highly dangerous. There exists a strong need to prepare hydrates with high gas contents and achieve good stability allowing their transportation at conditions that are relatively “mild”, such as for example low pressure. There are a lot of researches on effects of additives o increase storage capacity and stability of the formation hydrate .
Year: 2013
Publisher : 2nd National Iranian Conference on Gas Hydrate (NICGH)
By : Zahra Taheri ,Ghasem Khatinzadeh , Mitra Sina , Khodadad Nazari ,Ali esmaeilzadeh
File Information: English Language/ 8 Page / size: 648 KB
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سال : 1392
ناشر : دومین کنفرانس ملی هیدرات گاز (NICGH)
کاری از : زهرا طاهری، قاسم خاتین زاده، میترا سینا، خداداد نظری، علی اسماعیل زاده
اطلاعات فایل : زبان انگلیسی / 8 صفحه / حجم : KB 648
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