Method for preparing coalbed methane hydrate

Abstract

The invention relates to a method for preparing coalbed methane hydrate. According to the invention, coalbed methane is processed with a gas distributor, and forms fine bubbles; the fine bubbles enter from the bottom of an internal circulation flow reactor, and contact a low-temperature and high-pressure water flow, such that a hydration reaction is carried out, and coalbed methane hydrate slurry is formed; and reaction heat is removed through a cooling unit. An internal circulation device is arranged in the reactor, such that a buoyancy regulation zone is formed. The separation efficiency of a gas-water-hydrate multi-phase system is promoted; precise control over a heat and mass transfer process is realized; and the gas content of the hydrate is improved. Unreacted gas flows through the internal circulation device, and separated from water and hydrate. The gas is then returned to the reactor. The hydrate slurry flows through the internal circulation device, and liquid-solid separation is realized; and the liquid and solid respectively flows through a light phase flow channel and a heavy phase flow channel. The hydrate slurry is discharged into a central storage tank, and is subjected to gas-liquid and liquid-solid separation. After the slurry is concentrated, the slurry is separated, such that a dry hydrate product is obtained. Separated unreacted gas and low-temperature water are returned to the reaction system. With the method provided by the invention, hydrate can be prepared continuously, stably and highly efficiently.

Description

technical field [0001] The invention relates to a method capable of producing coal bed gas hydrate continuously, stably and efficiently. The invention belongs to the field of coal bed gas storage and transportation, and the technology and device of the invention can collect, store and transport coal bed gas safely and conveniently, and improve the utilization effect of the coal bed gas. Background technique [0002] Coalbed methane is an unconventional natural gas energy resource, a clean energy, and the effective use of coalbed methane is conducive to environmental protection and sustainable development of the national economy. [0003] Energy has a particularly important strategic position in the national economy. my country's current energy supply and demand contradiction is sharp, the structure is irrational; energy utilization efficiency is low; primary energy consumption is dominated by coal, and the massive consumption of fossil energy has caused serious environmenta...

AI Technical Summary

Problems solved by technology

[0012] (3) Connection problems with different pipeline pressures

[0013] Coalbed methane needs to be pressurized in every link from the wellhead to the user, resulting in increased costs

In addition, when using pressure pipelines to transport coalbed methane, due to the existence of a large amount of O2 and the increase of temperature accompanied by pressurization of coalbed methane, it is possible that the coalbed methane transportation process operates within the limits of combustion and explosion. lead to major security issues

[0014] (4) Waste of energy resources in small-scale gas wells

It is difficult to control the heat and mass transfer and system residence time in the preparation process. Although the co-current and counter-current processes have been proposed, the production process fluctuates violently and is difficult to control

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