Effect Of Soluble Organic Matter In Coal On Parameters Of Coal And Gas Outburst Danger

Coal is a complex organic rock,in addition to containing macromolecular solid skeleton,but also contains a large number of organic solvents soluble in small molecules of organic matter,they exist in the coal matrix pores and even macromolecular network structure,is bound to coal and Gas outbursts have a certain impact.Based on the coal structure,the influence of the soluble organic matter on the parameters of the protruding parameters is analyzed on the basis of testing the mechanical strength of the raw coal and extracting the residual coal,the difference between the drilling debris gas and the gas adsorption characteristics.Its mechanism of coal and gas outburst danger.Microwave-assisted extraction of each of the three different metamorphic levels was carried out using tetrahydrofuran solvent to obtain the extract(soluble organic matter)and the extracted residue(residual coal).The pore structure parameters of raw coal and residual coal were systematically tested by nitrogen adsorption method.The results showed that after the extraction of soluble organic matter,the total pore volume of coal increased,the specific surface area decreased,the average pore size increased,played a role of hole,reaming,indicating that coal soluble organic matter after extraction,simplified coal Pore structure,reducing the proportion of small holes in the coal,so that the structure of coal is relatively simple.The methane isothermal adsorption experiment was carried out before and after the extraction,and the adsorption characteristics of methane were analyzed before and after the extraction.The results show that the methane adsorption capacity of the extracted coal is lower than that of the raw coal,which indicates that the presence of small organic matter in coal can improve the ability of coal to adsorb methane.The mechanical properties of coal and residual coal before and after coal extraction were tested by mechanical experiments such as compressive strength and tensile strength of coal before and after extraction.The results show that the compressive strength,tensile strength and elastic modulus of the coal are higher than that of the raw coal under the same experimental conditions,and the coal is extracted from the coal under the same experimental conditions.Before and after the mechanical properties of the changes significantly.It is shown that the creep ability of the coal is weakened after the dissolution of the soluble organic matter,and the pore structure of the coal is simplified.The internal porosity of the coal matrix tends to be homogenized and simplified,which reduces the risk of coal seam and gas outburst.Using the laboratory equipment to simulate the coal and gas outburst parameters of the coal before and after the extraction,the change rule of the outstanding parameters before and after the coal extraction was studied.The results show that the parameters such as gas content,gas velocity,K1 and ? h2 are smaller than those of raw coal.Indicating that the presence of soluble organic matter in coal has a certain effect on coal and gas outburst.All in all,in this paper,a variety of experimental methods and techniques are used to study the pore structure,adsorption characteristics and mechanical properties of raw coal and residual coal.The influence of soluble organic matter on the parameters of protruding parameters is analyzed.The mechanism of the mechanism of soluble organic matter in coal to coal and gas outburst has a certain guiding significance to further reduce the related technology of coal seam coal and gas outburst risk.