Method and device for exploiting seabed surface layer natural gas hydrate

Abstract

The invention relates to a method and device used for exploiting seabed surface layer natural gas hydrate and used for the field of natural gas exploitation. The method and device for exploiting the seabed surface layer natural gas hydrate solves the problems that during the exploitation at present, a reagent is expensive, an instrument is complex, the lifting needs to consume plenty of energy, and complex three-phase flowing is involved in the lifting. The technical scheme is that first an exploitation device on a mining vehicle is started to drive a cutting head to cut the seabed surface layer natural gas hydrate; then natural gas hydrate slurry is sucked into a particle thinning device through a conveying pipe B and pumped into a right transfer chamber through a slurry pump; a control center is started, solid-fluid-gas three-phase hydrate enters a right heating chamber, a sensor B is triggered to be started, a microwave tube performs heating, the natural gas hydrate is decomposed, natural gas is collected through a gas collecting device on a working ship; and water and gravels are discharged to the seabed through a waste discharge pipe. The exploiting method is simple in principle and practical and can achieve continuous exploitation of the natural gas hydrate. The exploiting device is simple in structure and small in energy consumption and is used for exploiting the seabed natural gas hydrate.

Description

technical field [0001] The invention relates to a method for exploiting seabed surface natural gas hydrate and an exploiting device thereof, which are used in the field of natural gas exploitation. Background technique [0002] Natural gas hydrate is a white crystalline solid substance formed by water and gas molecules (mainly methane) under low temperature and high pressure conditions. 1m 3 The energy stored in natural gas hydrate is equivalent to 164m 3 Calorific value of natural gas. Gas hydrates are mainly distributed in terrestrial permafrost and deep sea areas. The reserves of gas hydrates in deep sea areas are about 100 times that of land and twice that of other fossil fuel reserves in the world. Therefore, gas hydrate is considered to be the most promising, new and clean alternative energy source in the future. [0003] At present, there are many ways to exploit natural gas hydrates. The first type is to decompose them by changing their physical and chemical prop...

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Problems solved by technology

[0005] The purpose of the present invention is: in order to overcome the problems of expensive reagents, complex instruments and equipment, and the need to consume a lot of energy for lifting, and the process of lifting hydrates involves complex three-phase flow in the current mining, a kind of natural gas hydrate on the seabed surface is proposed. Mining method and mining device thereof

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