Measuring method ofgas hydrate specific surface area and adsorbance

Abstract

The invention discloses a measuring method of gas hydrate specific surface area and adsorbance. A high-pressure physical adsorption instrument, a gas chromatograph and an X-ray diffractometer are adopted to accurately measure adsorbance of gas hydrate adsorbing gas and weight of a to-be-measured gas hydrate sample, and further the specific surface area of the gas hydrate is calculated finally. Themeasuring result has high reliability and high uniformity. The measuring method solves the technical problems in the prior art that during the gas hydrate adsorbing measuring process, the gas hydrateis liable to decompose and to release gas, measuring of gas adsorbance and the weight of the to-be-measured gas hydrate sample is disturbed, measuring difficulty is high, and the lack of an effectivemeasuring method to achieve effective and accurate measuring of the natural gas hydrate specific surface area and adsorbance. The measuring method is of great significance to study the kinetic mechanism of natural gas hydrate decomposition, establishment of a natural gas hydrate production model and other aspects.

Description

Technical field: [0001] The invention relates to the technical field of gas hydrate physical property measurement, in particular to a method for measuring the specific surface area and adsorption capacity of gas hydrate. Background technique: [0002] Natural gas hydrate is a non-stoichiometric cage-like crystal substance formed by water and small molecular gases such as methane. As a new type of clean energy, natural gas hydrates are widely distributed in the subsea continental shelf or plateau permafrost under high pressure and low temperature conditions. Its huge reserves all over the world make it an important alternative energy source and is widely valued by countries all over the world. [0003] At present, the exploitation of natural gas hydrate is mainly based on decompression method. By lowering the pressure, the hydrate is decomposed in an unstable state and the gas components are released. The main gas component of natural gas hydrate is methane, the crystal st...

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Problems solved by technology

[0004] However, since gas hydrate itself is rich in a large number of gas molecules and is easily decomposed under normal pressure, the surface of gas hydrate will change to a certain extent before and after measurement, and the measurement of the quality of gas hydrate samples also has a large difficulty

However, the traditional hydrate specific surface area measured only by the Langmuir isotherm adsorption theorem will cause the saturated adsorption capacity of the monomolecular layer to be negative due to the decomposition of the hydrate to be measured during the measurement process, making the measurement results unable to be further analyzed. calculate

At present, there is no effective measurement method that can use existing measuring instruments to achieve effective and accurate measurement of the specific surface area and adsorption capacity of natural gas hydrate

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