Research On Experiment Of Electrochemical Enhances Gas Esorption Low And Mechanism Of Long Flame Coal

Currently the main technology for gas desorption are relief act and external physics.Relief method uses coal to generate relief relieve stress and deformation in order to achieve the purpose of promoting the desorption barrier,but the coal to gas adsorption is so strong that the next state of stress in the coal gas desorption is still difficult.Therefore,only by making seam gas desorption pressure relief achieved effect is limited.To a certain extent external physics such as the sound field,electric field,electromagnetic field,temperature field can promote gas desorption.External physics provide a new way to solve the problem gas desorbed difficultly.Long flame coal is accounted for 13%of China's coal resources in proven reserves,mainly in the Northwest Territories.Long flame coal seam thickness,coal-bed methane resources capacity,combined with low rank coal basin coalbed methane foreign successful business development,so that our development of low-rank coal has very good prospects.Currently there is no form on long-flame coal gas adsorption and desorption systems research.This status has seriously hampered the development of low-rank coal.In view of gas on the surface of coal adsorbed difficultly is the core issues of gas drainage/coal bed methane extraction.Based on previous studies proposed a non-mechanical methods to promote long-flame coal gas desorption characteristics.This paper use electrochemical methods to strengthen long-flame coal gas desorption characteristics,and conducted the following studies:1.Self-developed electrochemical strengthening coal gas desorption test device.The device is include of gas injection system,liquid injection systems,electrochemical action systems,temperature monitoring systems and gas gathering system.2.Conducted the electrochemical modification test on the electrochemical modification device for fragmentation of 10?15mm long flame coal coal samples under potential gradient is 1V·cm-1,electrolyte concentrations were Omol·L-1,0.05mol·L-1,0.1mol·L-1,0.25mol·L-1,0.5mol·L-1.Conducted the electrochemical modification test on the electrochemical modification device for fragmentation of 10?15mm long flame coal coal samples under electrolyte concentrations is 0.05mol·L-1,potential gradient were OV·cm-1,0.5V·cm-1,1V·cm-1,2V·cm-1,4V·cm-1.Experimental results show that the anode region,the intermediate region,the cathode region of coal porosity,pore volume,average pore diameter Na2SO4 electrolyte concentration increases,the potential gradient increases exponentially after the electrochemical modification;Na2S04 electrolysis,but with a specific surface area concentration,increasing the potential gradient was negatively decreases exponentially.3.By Fourier transform infrared spectroscopy,electrophoresis,before and after the contact angle measuring instrument test electrochemical oxygen-containing functional groups of modified long flame coal content of coal,the surface electric potential,coal-water contact angle of the surface characteristics and other parameters.The results showed that the electrochemical modification anode region,the middle region,the cathode region of oxygen-containing functional group content of coal samples,the surface electric potential,coal-water contact angle increases Na2SO4 electrolyte concentration,potential gradient fluctuations decreased first.The number of oxygen-containing functional groups of coal samples,the surface electric potential,coal-water contact angle of the electrolyte concentration of 0.05?0.1 mol·L-1,the largest decline;at 0.1?0.5 mol·L-1,the decline fluctuations;in potential gradient of 0.5?1V·cm-1,the largest decline;at V·cm-1,a decline fluctuate.4.In developed electrochemical strengthen the coal gas desorption test device for 80mm ×80mm ×150mm long flame coal coal samples potential gradient is 1 V·cm-1,electrolyte concentrations were Omol·L-1,0.05mol·L-1,0.1mol·L-1,0.25mol·L-1,0.5mol·L-1,the electrochemical 0.5 mol·L-1 under conditions of enhanced coal gas desorption tests;electrolyte concentration of 0.05mol·L-1,respectively,the potential gradient OV·cm-1,0.5V·cm-1,1V·cm-1,2V·cm-1,4V·cm-1 under electrochemical conditions,such as enhanced coal gas desorption tests.The results showed that the amount of coal desorption with electrolyte concentration,strengthen the potential gradient increases first increases then decreases desorption.