Measuring method ofgas hydrate specific surface area and adsorbance

A technology for gas hydrate and specific surface area, which is applied in measurement devices, material analysis using radiation diffraction, instruments, etc., can solve the problems of difficulty in measuring the quality of natural gas hydrate samples, and the inability to obtain further calculation of the measurement results, and achieves low cost. , the effect of good measurement accuracy

Active Publication Date: 2019-04-05
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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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 saturat

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  • Measuring method ofgas hydrate specific surface area and adsorbance
  • Measuring method ofgas hydrate specific surface area and adsorbance
  • Measuring method ofgas hydrate specific surface area and adsorbance

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Embodiment 1

[0032] 1) Pre-cool the high-pressure physical adsorption instrument to a temperature range of -120 to -80°C, put an appropriate amount of methane hydrate sample into the high-pressure physical adsorption instrument and quickly vacuum, and then inject a certain amount of nitrogen in the high-pressure nitrogen bottle into the high-pressure In the physical adsorption instrument and measure the total amount of nitrogen injected into the high-pressure physical adsorption instrument N 1 ; After the adsorption process is completed, use the turbomolecular pump in the high-pressure physical adsorption instrument to extract unadsorbed nitrogen, and measure the total amount of this part of gas N 2, at the same time, this part of the gas is measured by a gas chromatograph due to the decomposition of part of the methane hydrate sample to produce methane component content y 1 ; Finally, the high-pressure physical adsorption instrument is heated up to completely decompose the methane hydrate...

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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...

Claims

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Application Information

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IPC IPC(8): G01N30/02G01N30/06G01N23/20G01N23/2005
CPCG01N23/20G01N23/2005G01N30/02G01N30/06G01N2030/025
Inventor 周雪冰梁德青陈佩丽唐翠萍万丽华
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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