沥青对活性焦强度及脱硫脱硝性能影响

Effect of asphalt on activated coke strength and desulfurization and denitrification performance

为探究沥青对脱硫脱硝活性焦性能的影响,通过改变沥青的混入方式及含量,研究活性焦强度和脱硫脱硝性能变化。研究发现,由于焦油加入沥青后流动性发生改变,相较沥青与原煤混合式制备的活性焦,沥青与焦油混合式制备的活性焦的耐磨强度降低1%、耐压强度降低15 N、碘吸附值降低了74 mg/g、脱硫值提高3.6 mg/g、脱硝率增加了2%;采用沥青与原煤混合式制备活性焦,随着沥青含量由0增至12%,耐磨强度由92.0%提高到97.7%,活性焦耐压强度由280 N提高到480 N,碘吸附值在沥青含量为8%时达最小值436 mg/g,脱硫值由38 mg/g降至20.6 mg/g,脱硝率由72%降至68%。沥青含量的增加会提高原料间的黏结性,同时过多的沥青会堵塞活性焦孔隙、造成活性焦板结,导致脱硫脱硝性能降低。

To explore the effect of asphalt on the performance of desulfurization and denitrification activated coke,the strength,the desulfurization and denitrification performance of the prepared activated coke were studied by changing the mixing method and content of asphalt.The results show that,due to the change of fluidity after adding asphalt to tar,compared with the active coke prepared by the mixture of asphalt and raw coal,the abrasive resistance of the active coke prepared by the mixture of asphalt and tar decreased by 1%,the compressive strength decreased by 15 N,the iodine adsorption value decreased by 74 mg/g,the desulfurization value increased by 3.6 mg/g,and the denitrification value increased by 2%.When asphalt was mixed by coal tar,increased asphalt content from 0 to 12%,we found that the abrasive resistance was increased from 92.0%to 97.7%,activated coke crushing strength increased from 280 N to 480 N,and the minimum valuei odine adsorption value was 436 mg/g while 8%asphalt.Meanwhile,the desulfurization value decreased from 38 mg/g to 20.6 mg/g,and he denitrification rate was reduced from 72%to 68%.The increase of asphalt content improved the cohesiveness between raw materials,and excessive asphalt also blocked the pores of the activated coke,causing the activated coke to harden,and reducing the desulfurization and denitrification performance.