High-pressure experimental device and method for researching phase equilibrium of methane hydrate

Abstract

The invention discloses a high-pressure experimental device and method for researching the phase equilibrium of a methane hydrate. The experimental device comprises a methane-hydrate reaction kettle,a constant-temperature oil bath device, a methane gas source and a gas meter, wherein the methane-hydrate reaction kettle is placed into the constant-temperature oil bath device; the methane-hydrate reaction kettle is connected with a precision pressure gauge, a gas inlet pipeline and a gas outlet pipeline respectively through a cross joint; the gas inlet pipeline is provided with the methane gassource; the gas outlet pipeline is provided with the gas meter. The gas inlet pipeline is also provided with a methanol booster pump, a gas inlet valve and an emptying valve; the gas outlet pipeline is also provided with a gas intake valve. The high-pressure experimental device can be used for accurately controlling temperature and pressure conditions in wider pressure and temperature ranges, is used for realizing the formation and decomposition experiments, in an equilibrium state or near-equilibrium state, of the methane hydrate, and is used for accurately researching the phase equilibrium condition of the methane hydrate.

Description

technical field [0001] The invention relates to an experimental device and method for studying the formation mechanism of methane hydrate, in particular to a high-pressure experimental device and method for studying the phase equilibrium of methane hydrate. Background technique [0002] Since natural gas hydrate was paid attention to because of blocking gas pipelines in the 1930s, a large number of experimental studies on methane hydrate have been carried out successively. Methane hydrate is a crystalline solid compound composed of water molecules and hydrocarbon gas molecules. It is ice-like in shape and is usually white in color. In this ice-like crystal, water molecules form a polyhedral skeleton, and the holes in the skeleton can be occupied by gas molecules. There are a large amount of methane hydrate resources in deep ocean water areas and terrestrial permafrost strata, and the world's energy situation is becoming increasingly severe. As a clean energy with abundant ...

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Problems solved by technology

These devices and methods are generally not suitable for basic research on the phase equilibrium of methane hydrate, and the reasons are as follows: In order to realize the visualization effect, the formation or decomposition process of methane hydrate is generally required to be relatively fast, so the formation or decomposition process of methane hydrate is very fast. Occurs in non-equilibrium state of supercooling or superheating, not suitable for accurate determination of phase equilibrium state

In addition, the pressure and temperature of these experimental devices are suitable for a narrow range, generally the pressure is below 10MPa, and the temperature is below 10°C, which is not suitable for phase equilibrium studies at higher pressures and wider temperature ranges.

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