Study And Application Of Elimination Performance Of Copper-Loaded Adsorbent For CO In Upper Corner Of Coal Mining Face

The problem of excessive CO gas concentration in the coal mining face has always plagued the normal production activities of the mine,seriously restricting the mining progress,and even threatening the life and health of the miners,in addition,the CO source is numerous and the treatment is difficult.In this paper,from the perspective of elimination,combined with industrial CO adsorption technology,adsorbent was prepared,the optimum parameters of CO elimination performance were studied,and the eliminating technology suitable for coal mining face was put forward.It can effectively reduce the CO in the upper corner of coal mining face,which is of great significance for ensuring the safe and efficient production of coal mine.According to the research content,the CO elimination performance test experimental device was designed and developed,including:the main part of the device,the gas source,the sensor,the anemometer and so on,and introduced the function of the experimental device,which can realize the experimental study of solid and liquid adsorbents under different influencing factors.Theoretical analysis selected CuCl with high selectivity to CO,and prepared with CuCl-loaded zeolite and active carbon adsorbent by impregnation method.The high-temperature calcination allowed the CuCl to be supported on the carrier in a single layer.The zeolite and active carbon adsorbents loaded with CuCl,and unsupported zeolite and active carbon are tested for specific surface area and pore structure.It is found that the specific surface area decreased,the pore volume decreased,and the average pore diameter increased after the carrier was loaded with CuCl.The specific surface area and pore volume of zeolite are the largest,and the effect of oading CuCl is the best.The XRD test results show that CuCl achieves a single layer dispersion on the support,but some of the CuCl was not loaded on the support,and the effect of CuCl oaded on zeolite is better.Through the static elimination experiment in the closed space,the change rule of CO elimination by the adsorbent is obtained:the concentration of CO decreases sharply after the first addition of the adsorbent,and the decline tends to be gentle after 10 minutes,and remains unchanged at 15 minutes;the trend of CO concentration after adding adsorbent again is the same as that of the first time,but the decline rate is less than the first time,and the amount of elimination after the first addition of the adsorbent is greater than the second time.The results show that the CO concentration has a significant effect on the elimination effect of the adsorbent,and the higher the concentration,the better the elimination effect.The measured elimination amount is CuCl/NaY adsorbent>CuCl/AC adsorbent>NaY adsorbent>AC adsorbent,CuCl/NaY adsorbent has the best elimination effect,the highest elimination amount is 230ppm,and the elimination rate is 61.17%.Four kinds of adsorbents are tested for dynamic elimination performance by using the CO elimination performance test device.The results show that the CuCl/NaY adsorbent has the best elimination performance when it was placed in the middle of the pipeline at 1.Om/s wind speed and 600g adsorbent weight.The maximum elimination amount is 82ppm.The importance factors of the adsorbent elimination performance measured by orthogonal experimental design,the result is adsorbent weight>adsorbent position>wind speed.Finally,the solid elimination process was used in the field of 130205 fully mechanized mining face.The results showed that the CO concentration in the upper corner was significantly reduced when the coal mining face was mined,indicating that the solid elimination process has a better effect on reducing the CO concentration in the working face.