| Coal resources are indispensable mineral resources in our country.Although our country’s coal resources are very rich,there are various hidden dangers of gas accidents in the mining process.Among them,coal and gas outburst accidents have long threatened the life safety of coal miners in our country and restricted the coal industry.development of.The main reason is the imperfect grasp of the coal and gas desorption laws,and the inability to accurately predict and forecast gas accidents.In order to enrich the law of coal and gas desorption,the influence mechanism of constant temperature heating core heat injection on gas desorption law of gas-bearing coal particles and the influence mechanism of water-based ferrofluid on gas desorption law of gas-bearing coal particles were explored.Adopting the method of combining experimental research,theoretical analysis and Gauss software simulation,analyzing the experimental data before and after heat injection of the constant temperature heating core,and calculating the energy of gas molecules combined with Gauss software simulation.The main research results are as follows:1.The adsorption and desorption process of nitrogen and methane gas containing gas coal particles is related to the equilibrium pressure.Through the analysis and comparison of experimental data,it is concluded that the greater the reaction equilibrium pressure,the greater the adsorption and desorption of gas-containing coal particles of nitrogen and gas,and the adsorption and desorption of gas due to different gas adsorption properties are much larger than Nitrogen.2.The desorption process of nitrogen and gas containing gas coal particles is affected by temperature.By comparing the desorption volume before and after heat injection under the same pressure,the diffusion coefficient D,the limit desorption volume and the initial desorption rate of gas and nitrogen gas have been significantly improved.From this,it is concluded that the constant temperature heating core heat injection It promotes the desorption process of gas-containing coal particles.3.Through the Gaussian software to simulate and calculate,get the influence of temperature change on the thermodynamic energy of gas gas molecules,and compare it according to the absolute value of the temperature.When the temperature is 288K(15°C),the absolute value is 40.491730J;when the temperature rises Up to 40°C,the absolute value is 40.491477 J.The absolute value of thermodynamic energy at 288 K is greater than that at 313 K.Therefore,gas molecules at 313 K are more active and have higher energy than at 288 K,which is more conducive to the desorption process of gascontaining coal particles.4.Through the Gaussian software to simulate and calculate,the effect of temperature change on the Gibbs free energy of gas molecules is obtained,and the Gibbs free energy change-△G is calculated and the result is-△G(313K)=40.512868J>40.511131J=-△G(288K),it can be seen that gas molecules at 313K(40°C)have higher energy and more active than at 288K(15°C),and are more conducive to the desorption of gas from coal particles containing gas.That is to promote the process of coal and gas desorption.5.The addition of water-based ferrofluid can inhibit the gas desorption of gascontaining coal particles.In order to enrich the multi-factor research on the gas desorption mechanism of gas-bearing coal particles,the influence of water-based ferromagnetic fluid on the gas desorption law of gas-bearing coal particles was investigated.The laboratory data was analyzed and compared,and the water machine ferromagnet was added.After fluid,the ultimate desorption capacity,initial desorption rate,and diffusion coefficient D during the desorption process of coal and gas all decreased significantly.It can be seen that the water-based ferrofluid can inhibit the gas desorption process of gas-containing coal particles.The paper has 34 pictures,15 tables,and 86 references. |
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