Experimental Study On Coal Seam Acidification And Anti-Reflection Technology

In this paper,three coal samples of Shanxi Datong 13^#bituminous coal,Shanxi Linfen 2^#lean coal,Guizhou Liupanshui 3^#anthracite coal are taken as research objects,and the best concentration of acidification of specific main minerals rich in coal seams is studied by reference to previous researchers.Based on the research results,starting from the micro-structures such as pores and fissures of coal,the permeability and porosity of coal samples with acid and acid under different temperature and pressure conditions were investigated and compared with the original coal samples.,analyze the anti-reflection effect.In the experiment,X-ray diffractometer and electron microscopy were used to measure the basic parameters of three different coal samples.The results showed that the minerals in the coal seam were mainly kaolin;the experiment of the acid formula corresponding to this mineral was reviewed.Data,found that the best acid formula is 3%HCL+3%HF+3%CH₃COOH+2%KCL;Using mixed acid to acidify the coal core and coal powder,measuring coal Permeability and porosity after acidification and the dissolution rate of coal powder before and after acidification.Due to the different depths of different coal seams,the subsequent experiments investigated the effects of coal on the permeability of coal by changing the temperature and pressure of the coal samples.The results show that the pressure has a relatively large influence on the permeability of coal.With the increase of pressure,the permeability of coal decreases.The influence of temperature on coal permeability is relatively small.With the increase of temperature,the permeability of coal increases first.It decreases and then gradually stabilizes;the porosity changes with the trend of pressure,temperature and permeability;the acid solution has a significant effect on the acidification and dissolution of coal.With the increase of time,the dissolution rates of three different coal samples are all In the increase;the time taken for the permeability and porosity to reach the maximum value is increased compared with the dissolution rate because the test for permeability and porosity experiments uses a coal core,and the dissolution rate experiment uses pulverized coal,pulverized coal.The contact area with the acid is larger.In general,by acidifying the coal,the minerals filled in the coal are dissolved,the pores and fractures become better,and the permeability increases,which is an important guide for the development of actual coalbed methane or gas drainage.significance.