Semi-continuous decomposition device for gas hydrates

Abstract

The invention discloses a semi-continuous decomposition device for gas hydrates. The device comprises a feeding bin, a powder making bin, a grinding bin, an ice storage bin and an auxiliary system used for storing gas for the device or adjusting the pressure in the device; the feeding bin is located on the upper portion of the powder making bin and used for adding undecomposed hydrates into the device; one end of the powder making bin is connected with the bottom of the feeding bin, the other end of the powder making bin is connected with the top of the grinding bin, and the powder making bin is used for crushing the blocky hydrates into hydrate particles; and a grinding mechanism used for grinding the hydrate particles into ice powder is arranged in the grinding bin, and the bottom of the grinding bin is connected with the top of the ice storage bin. According to the device, in the hydrate decomposition process, the specific surface area of the hydrates is increased through physical modes of crushing and grinding, and the decomposition rate of the hydrates is increased; the hydrates are decomposed in the device to form gas and ice, so that the phase change latent heat required by the decomposition of the hydrates is greatly reduced, and the product after the decomposition of the hydrates is not polluted; and the device is simple in structure, stable in operation and low in energy consumption.

Description

technical field [0001] The invention relates to the technical field of hydrate preparation, in particular to a gas hydrate semi-continuous decomposition device. Background technique [0002] Gas hydrate is an ice-like crystalline compound with a cage structure composed of small molecular gases and water molecules mainly composed of methane, carbon dioxide, and nitrogen. Under the conditions of low temperature and high pressure, gas hydrate can exist stably. Under normal temperature and pressure, natural gas hydrates will quickly decompose to form free natural gas and water. Naturally formed gas hydrates are widely distributed in deep-sea sediments or continental permafrost. In recent years, with the discovery of a large number of natural gas hydrates around the world, it has become an alternative energy source with great development potential. At present, the proven natural gas hydrate reserves in the world are as high as 2.1×10 16 m 3 , which is more than twice the tot...

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Problems solved by technology

However, when the hydrate needs to decompose to release the stored gas, the compact block will inhibit the decomposition rate of the hydrate, and at the same time, when the hydrate decomposes into liquid water, it will absorb a large amount of heat and lower the temperature, further reducing the decomposition rate of the hydrate

The traditional method of accelerating hydrate decomposition requires spraying a large amount of thermodynamic inhibitors on the surface of hydrates. Although this method can significantly improve the decomposition efficiency, it requires a lot of energy consumption, and the pollution of the inhibitors to water makes it impossible to put them into gas storage again. process, resulting in unnecessary waste

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