Apparatus and method to prepare methane hydrates under normal pressure

Abstract

The invention discloses an apparatus to prepare methane hydrates under normal pressure. The apparatus comprises: a foaming unit for generating foam; a liquid supply unit for providing a low-temperature methane liquid; a reactor unit having the upper end communicated with the foaming unit and the lower end communicated with the liquid supply unit, and used for generating methane hydrates; a data acquisition unit for acquiring interior temperature and resistivity of the reactor unit. The apparatus herein has the advantages that the low-temperature methane liquid is introduced into a storage tankunder the normal pressure and low temperature, high-ratio foam liquid is generated via the foaming device, and methane hydrates are generated during the process where the low-temperature methane vapor moves up and gains contact with the foam to give rise to heat and mass transfer; the whole experimental process is simple to perform, has low experimental environment requirements, is suitable for quick preparation of methane hydrates under normal pressure, and has the advantages of low time consumption, low cost, and high experimental repeatability.

Description

technical field [0001] The invention belongs to the technical field of natural gas hydrate, and in particular relates to a preparation device and a preparation method of methane hydrate under normal pressure. Background technique [0002] Natural gas hydrate has extensive reserves in the world and is a kind of clean energy, so it has important application prospects. The current research on natural gas hydrates has found that its formation conditions are basically in a high-pressure and low-temperature environment. Once the pressure drops or the temperature rises, the hydrates will quickly decompose. At present, there are mainly the following methods for preparing methane hydrate in the laboratory: [0003] 1. Gas-liquid interface contact method: under a certain pressure and temperature, the gas is fed from the top of the reactor, and the natural gas and the solution are kept in contact at the interface to form hydrate crystal nuclei and diffuse into the solution to form a l...

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Problems solved by technology

[0008] (1) The above methods are all reacted in a high-pressure airtight container, which requires high requirements for experimental equipment and operation. Once the external environment changes, the hydrate is easy to decompose

[0009] (2) The above methods take a long time to prepare hydrates, often require a lot of time to generate hydrates, the preparation is greatly affected by the external environment, and it is difficult to repeat different experimental conditions, etc.

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