Research On CO Elimination Characteristics And Influence Mechanism In Underground Coal Mine

In view of the problem that CO exceeding the limit in the high temperature and humidity environment of underground coal mine is easy to cause a large number of casualties,Cu-Mn-Sn water-resistant elimination was prepared by co-precipitation method,and the influencing factors of its activity were characterized by microcosmic-macroscopic by material analysis and testing technology.The influence of high CO concentration,high temperature and high humidity on the eliminated performance was studied by using the activity test platform.The factors influencing the eliminated performance of Cu-Mn-Sn water-resistant elimination agent and the influence mechanism of dry and humid environment on CO elimination process were revealed by using the infrared spectroscopy.The factors influencing the activity of Cu-Mn-Sn water-resistant elimination were analyzed,and the optimal ratio of Sn was determined.The self-developed activity testing platform was used to compare the activity of Cu-Mn-Sn water-resistant elimination agent with different Sn contents in dry and wet environments.It was found that the activity of Cu-Mn-Sn-20 agent with 20%Sn content was 2.10×10^-3mmol·g^-1·s^-1 and 1.26×10^-3mmol·g^-1·s^-1 in dry and wet environments,respectively,which was 3.23 times and 5.73 times of that of Cu-Mn elimination agent without Sn.20%Sn was the optimal ratio of Cu-Mn-Sn agent with water resistance.Eliminative are most active in dry and wet environments.The high efficiency mechanism of Cu-Mn-Sn-20 water-resistant elimination agent with 20%Sn content was revealed.The microcosmic-macroscopic characterization showed that the specific surface area of Cu-Mn-Sn-20 agent was 86.04 m²·g^-1,the average pore size was 10.88 nm,the molecular surface structure was regular and the Cu O phase appeared,and the formation of coordination water between Cu ions and H₂O was hindered in the wet environment.It is the main factor to improve its activity in dry and wet environment.The extreme environment of high CO concentration,high temperature and high humidity caused by underground coal mine space was simulated,and the influence of extreme environment caused by underground coal mine space on CO elimination performance of Cu-Mn-Sn water-resistant elimination agent was obtained.When CO concentration at 7%,CO concentration can be reduced to less than 0.55%within 248s,providing time for downhole personnel to escape.Moreover,high concentration of CO can promote the elimination,reducing the elimination time per unit volume of CO.High temperature can shorten the elimination process and improve the ablation efficiency of the ablator.The deepening of water toxicity of Cu-Mn-Sn water-resistant elimination agent will cause H₂O to occupy the surface active site of ablator,which will reduce the elimination agent activity,stability and elimination rate.Long-term exposure of elimination agent in wet environment will eventually reduce the eliminated performance.The influence mechanism of Sn doping on eliminative performance in dry and wet environments was obtained.The"CO adsorption enhancement"mechanism of Sn on Cu-Mn-Sn water-resistant eliminative and the"water resistance"mechanism of inhibiting carbonate formation were revealed,which provides theoretical support for the application of eliminative in underground coal mine.Cu-Mn-Sn water-resistant elimination agent is used to rapidly eliminative CO generated from coal mine underground coal mine space,and the potential application of elimination agent in underground space of coal mine is also discussed,which is of great significance to the rescue of coal mine after disaster.