Separation method of methane from coal bed methane-air mixture and system thereof

Abstract

The invention provides a separation method of methane from coal bed methane-air mixture and a system thereof. The separation method includes a step of performing a hydration reaction to the coal bed methane-air mixture and collecting methane-rich gas. A hydration reactor for the hydration reaction has a structure that a chamber in the hydration reactor is divided into an inlet section, a throat tube section and a stable section in the flowing direction of a hydrate work fluid, wherein the flow area in the throat tube section is less than that of the inlet section and the stable section. A gas inlet is formed in the side wall corresponding to the throat tube section in the chamber of the hydration reactor. By means of the separation method, a step of compressing and pressurizing the coal bed methane-air mixture when the methane is separated from the coal bed methane-air mixture through a hydrate separation method in the prior art, thereby avoiding risk of explosion during compressing and high-pressure flowing processes of the coal bed methane-air mixture. The method is safe in operation and is excellent in practical industrial application availability.

Description

technical field [0001] The invention relates to a method and system for separating methane in air-mixed coal bed gas, belonging to the technical field of chemical industry. Background technique [0002] Coal Bed Methane (CBM for short), also known as coal mine gas or mine gas, is produced in the coal-forming process and mainly exists in coal seams in an adsorbed state. It is an unconventional natural gas resource with methane as the main component. [0003] At present, the main methods of mining coalbed methane are surface drilling and underground extraction. Surface drilling technology is widely used in the development of coalbed methane in foreign countries. However, China's geological conditions are complex, and most of the coal seams have relatively poor air permeability. Restricted by technology and geological conditions, the current development of coalbed methane in China is mostly used underground Extraction technology. The methane content in coalbed methane obtaine...

AI Technical Summary

Problems solved by technology

The existing hydrate separation method can make the separation of air-mixed coalbed methane in a water-saturated environment, but because the separation of hydrates needs to be carried out under a certain pressure, there are also problems in the process of compressing and boosting the air-mixed coalbed methane in the early stage. The danger of explosion is equally difficult to adopt

Images