Experimental study on the law of CO production in coal seam drilling

Drillingoperationiswidelyusedinmoderncoalmineoperation.Carbonmonoxidegas(CO) isproducedincoalseamduringdrillingoperation,whichleadstofireandCOexceedingaccident.In thispaper,anexperimentalplatformformonitoringCOincoalboreholeisbuiltandFourierinfrared spectroscopyiscarriedouttoanalyzethelawofproductionCOincoalseamduringdrillingfrommacroscopicandmicroscopicperspectives.TheexperimentalresultsshowthatthereisacertainamountofCO generatedinthecoalseamdrillingoperation,andtheproductionofCOisproportionaltothespeedand temperatureofthedrillbit.Inthecoalsamplecuttingsafterdrilling,thecontentsofaliphaticgroupand oxygen-containingfunctionalgrouparehigherthantherawcoal,indicatingthattheproductionrateof COishigherthantheconsumptionrate.AnalysisshowsthattheCOproducedduringdrillingoperation isamixtureofoxidizedcarbonmonoxide(O-CO)andcarbonmonoxide(S-CO)produced by the crackingofcoalmacromolecules.Amongthem,theO-COgeneratedduringdrillingoperationmainly comesfromoxygen-containingfunctionalgroupsformedbyoxidationofaliphaticfunctionalgroupssuch as—CH2and—CH3,andpyrolysisoccursundertheactionofinternalenergy.S-COiscausedbycoal*s macromolecularfractureandtheconversionofmechanicalenergytothermalenergy,leadingtothepyrolysisofoxygen-containingfunctionalgroupsinrawcoal.