Method and device for exploiting deep sea combustible ice

Abstract

The invention relates to a method and a device for exploiting deep sea combustible ice. The method comprises the following steps of: transporting the combustible ice to a supercritical water oxidation reactor in seabed, wherein the supercritical water oxidation reactor is filled with water medium; sending preheating oxygen to the supercritical water oxidation reactor from an external pump, wherein the pressure of the oxygen is equal to or a little more than the pressure in the supercritical water oxidation reactor; igniting in the supercritical water oxidation reactor; and performing an oxidation reaction on the combustible ice, wherein the heat generated through reaction is sent to seal level through heating water vapor by a deep sea steam heater so as to drive a steam turbine to generate electricity, the concretes and non-condensing materials from the deep sea steam heater are separated, and a part of the separated water returns to the supercritical water oxidation reactor to be used as evaporable water. By the invention, the combustible ice can be oxidized under a deep sea supercritical water state; and oxidation exothermic is used for generating electricity, so that the combustible ice can be prevented from volatilizing in the process of transporting to the sea level, and environmental risk is eliminated.

Description

technical field [0001] The invention relates to a method and device for mining deep-sea combustible ice, in particular to a method for mining deep-sea combustible ice by supercritical water oxidation, and belongs to the technical field of energy and environment. Background technique [0002] Combustible ice, scientifically known as natural gas hydrate, is an ice-like crystalline substance formed by natural gas and water under high-pressure and low-temperature conditions, and is distributed in deep-sea sediments. Methane in combustible ice accounts for 80%-99.9%, which can be ignited directly, with high combustion value, clean and pollution-free. The birth of combustible ice must meet at least three conditions: first, the temperature should not be too high, if the temperature is higher than 20°C, it will "disappear", so the temperature of the deep sea is most suitable for the formation of combustible ice; second, the pressure must be If it is large enough, the deeper the dee...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a method and device for mining combustible ice in the deep sea to solve the problem that methane escapes and cannot be collected during the mining of combustible ice. The supercritical water oxidation method is used to oxidize the combustible ice in the deep sea in situ, and heat is released to heat the water. Used to generate electricity and provide new ideas for the mining of deep-sea combustible ice

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