Pressure vessel for CO2 displacement and pressure reduction combined mining of hydrates

Abstract

The invention discloses a pressure vessel for CO2 displacement and pressure reduction combined mining of hydrates. The pressure vessel comprises a kettle body, a piston, a kettle lid and a support, wherein the piston is in sealed fit with the inner wall of the kettle body and can move up and down; the kettle lid is connected and arranged at the top of the kettle body; the support is arranged at the bottom of the kettle body in a supporting manner; a pressure detection port, a gas inlet / outlet and a temperature detection port which can be connected to an inner cavity of the kettle body are arranged on the kettle lid; a micro-porous filter is mounted at one end, which is close to the kettle lid, of the inner cavity of the kettle body; and a temperature sensor and a one-way valve are arranged on the piston. The pressure vessel is simple in structure and convenient to operate and study, natural gas hydrates can be synthetized in the vessel, unreacted gases can also be discharged in an equal pressure manner, decomposition of the hydrates is avoided, and the hydrates can be tableted, so that intuitive determination for CO2 displacement and pressure reduction combined mining of the hydrates as well as CO2 displacement mining of methane hydrates is realized.

Description

technical field [0001] The invention relates to experimental research equipment for natural gas hydrate, in particular to a CO 2 A pressure vessel for the combined displacement and depressurization of hydrate production. Background technique [0002] Gas hydrates widely exist in deep seabeds and permafrost areas. It is estimated that the amount of gas hydrates contained in the shallow lithosphere with a global depth of less than 2000m is equivalent to twice the sum of proven conventional fossil fuels. Therefore, the exploitation of natural gas hydrate has also attracted much attention. More and more researchers are simulating the extraction of gas hydrate in the laboratory. [0003] At present, the pressure vessels for simulating the exploitation of natural gas hydrates can be divided into fixed volume pressure vessels and variable volume pressure vessels according to whether the volume is variable. The fixed-volume pressure vessel mainly includes a cylinder, which is pro...

AI Technical Summary

Problems solved by technology

At present, most of the pressure vessels used to exploit natural gas hydrates are of fixed volume. Although they are simple in structure, they still have some defects. response, especially in CO 2 In the method of displacement recovery of natural gas hydrate

Existing variable volume tanks for hydrate synthesis and exploitation are generally less and have complex structures

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