Relay station for seabed blocky hydrate mining and pretreatment method of blocky hydrate

Abstract

The invention belongs to the technical field of hydrate mining, and provides a relay station for seabed blocky hydrate mining. The problems that in the in-situ solid state mining process of seabed blocky hydrate at present, the hydrate only can be lifted to a deck for decomposition, energy sources are greatly consumed, and larger construction risks are brought are solved. The relay station is mainly composed of a hydrate slurry inlet, a surface layer hot seawater inlet, a mixed cavity, a loop division plate, a stirrer, a muddy sand conveying belt and a reinjection buffering cavity. The pretreatment method of the blocky hydrate comprises the steps that firstly, a hydrate slurry body is mixed with hot seawater in a throat, a mixed slurry body decomposes in a decomposition cavity, gas entersa gas buffering cavity, and muddy sand enters the reinjection buffering cavity. The relay station can perform hydrate decomposition and muddy sand separation treatment in a hydrate lifting pipeline, can reduce energy loss brought by muddy sand lifting, can reduce platform construction risks, and reduce the withstand voltage grade requirement on equipment.

Description

technical field [0001] The invention belongs to the technical field of hydrate mining, and in particular relates to a relay station for seabed massive hydrate mining and a hydrate pretreatment method. Background technique [0002] There are two main forms of marine gas hydrate: pore-dispersed gas hydrate and seepage-type massive gas hydrate. Massive hydrates exist in the form of "ice cubes" visible to the naked eye. The in-situ solid-state mining method is one of the ways to exploit shallow massive hydrates. The main solution is to mechanically crush the in-situ hydrates to form hydrate solids , mud and sand mixed slurry, and pumped to the deck along with the cold sea water for decomposition. Since the hydrate mortar system contains a large amount of mud and sand and cold sea water, the requirements for the lifting system are very strict when the deck is decomposed. Lifting a large amount of mud and sand to the deck and then separating and reinjecting not only wastes liftin...

AI Technical Summary

Problems solved by technology

[0004] In view of the current in-situ solid-state mining process of massive hydrates on the seabed, the hydrates can only be lifted to the deck for decomposition, which consumes a large amount of energy and brings relatively large construction risks. The present invention provides a method for A relay station for subsea massive hydrate mining and a massive hydrate pretreatment method. The relay station can perform hydrate decomposition and mud-sand separation in the hydrate lifting pipeline, and has the functions of mud-sand reinjection and buffering the upper lifting system , not only can reduce the energy loss caused by the lifting of mud and sand, but also can reduce the risk of platform construction and lower the requirements for the withstand voltage level of equipment

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