Experimental Study on Influencing Factors and Thermal Effects of CO Adsorption by Coal.

The utilization of CO is extremely important to solve the environmental problems and coal spontaneous combustion in goaf. There are three kinds of CO utilization in goaf: adsorption, diffusion, and seepage. Since adsorption will consume CO in goaf, the optimization of CO injection amount is very critical.

Characteristics and Safety of CO for the Fire Prevention Technology with Gob-Side Entry Retaining in Goaf.

The mining technology of gob-side entry retaining without a coal pillar is gradually becoming a mature and increasingly important mining technology. As it maintains the roadway near goaf, the air leakage should be greater than a U-type ventilation system in goaf, so it is prone to cause coal spontaneous combustion problems. CO is an inert gas, and it is usually used to prevent spontaneous combustion and extinguish coal fire.

Optimisation of multisource injection of carbon dioxide into goafs based on orthogonal test and fuzzy comprehensive theory.

Carbon dioxide is a common inert gas used for fire prevention and extinguishing fires in underground coalmines. However, the single pipeline used for carbon dioxide injection has the characteristics of a narrow inerting area, serious gas leakage in the field, and poor control. To address these risks, we herein propose a technique for multisource injection of carbon dioxide and for building up an index system of carbon dioxide injection for fire prevention and extinguishing in goafs by analysing the parameters of the gas injection pipe, mining technique, and physical qualities of the inert gas.