Hydrate mortar system thickening separation device and separation method

Abstract

The invention discloses a hydrate mortar system thickening separation device and a separation method. The separation device is installed at a height of a seawater relay station and is used in conjunction with a relay station of a lifting system. The hydrate mortar system thickening separation device comprises a separator autoclave body, a primary cold seawater separation unit and a secondary coldsea water separation unit, wherein the primary cold seawater separation unit and the secondary cold sea water separation unit are arranged in the separator autoclave body. Through the design of the separator autoclave body and the coordination of the primary cold sea water separation system and the secondary cold sea water separation system, the separation of cold sea water and a small amount of hydrate decomposing gas from a hydrate mortar system is realized, the separated cold sea water is discharged into a cold sea water reinjection pipeline and reinjected back to a sea floor, the small amount of hydrate decomposing gas is guided into an upper lifting pipe and mined on a platform, and the separated and thickened hydrate mortar system is guided into the next decomposition process and further decomposed. Through the design of the structure, the thermal energy utilization rate in the subsequent hydrate decomposition process can be improved, the subsequent lifting pressure is facilitated to be reduced, and more favorable technical support for massive hydrate mining is provided.

Description

technical field [0001] The invention belongs to the field of natural gas hydrate exploitation in sea areas, and specifically relates to a hydrate mortar system thickening separation device and separation method, which are used to separate a small amount of hydrate decomposition gas and a large amount of cold seawater from a cold seawater mortar system to realize hydrate slurry It is suitable for the separation of multi-phase and multi-component during the solid-state mining of marine massive / fractured natural gas hydrate. Background technique [0002] Aiming at the phase equilibrium conditions of natural gas hydrate, the currently developed natural gas hydrate production methods mainly include depressurization method, thermal excitation method, CO 2 -CH 4 Replacement method and chemical inhibitor injection method or the improvement and combination of these methods, etc. The basic idea of ​​these methods is to decompose natural gas hydrate into gas and water in the in-situ ...

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Problems solved by technology

The hydrate mortar system contains a large amount of cold seawater, which is not conducive to the decomposition of hydrate in the relay station. Therefore, separating the original cold seawater and mud sand from the hydrate mortar system before hydrate decomposition is not only conducive to promoting the subsequent hydrate decomposition efficiency. , and can reduce the follow-up artificial lift pressure, which is one of the important measures to improve the follow-up lift efficiency. Proposed solution to the difficult problem of multiphase separation of components

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