成型压力对低变质粉煤微波催化共热解的影响

Effects of Molding Pressure on Microwave Catalytic Co-pyrolysis of Low Rank Pulverized Coal

对不同成型压力下低变质粉煤与二硫化钼微粉冷压而成的型煤进行微波共热解实验.通过对热解产物收率分析、固体产物工业分析和元素分析、微观形貌(SEM)分析及红外光谱(FTIR)检测、液体产物气相色谱-质谱联用(GC-MS)检测以及气体产物组分分析等方法,研究了成型压力对型煤微波催化共热解产物收率和产品质量的影响.结果表明:随着成型压力增大,液体产物收率呈先增大后基本不变的趋势.在成型压力为7 MPa时,微波共热解所得液体产物收率达到28.4%(质量分数,下同),固体产物收率为64.0%,煤气收率为7.6%;所得煤气中CH_4,CO和H_2的体积分数分别为25.34%,31.51%和22.19%,热值为15.14MJ/m^3;焦油中羟基、单核芳烃及脂肪族—CH_2和—CH_3结构含量较高,焦油呈轻质化态势.

Microwave co-pyrolysis of low rank pulverized coal and micron-size molybdenum disulfide powder cold press molding was performed in a custom microwave oven.Effects of molding pressure on the yield and quality of microwave pyrolysis products were studied via proximate and ultimate analysis,infrared spectroscopy（FTIR）,scanning electron microscope（SEM）,gas chromatography-mass spectrometer（GC-MS）,and gas component analysis.Results indicate that the yield of liquid product firstly increases and then substantially keeps constant with the gradually increasing of molding pressure.When the molding pressure is 7 MPa,the yield of liquid product is up to the highest of 28.4%（mass fraction,the same below）,solid product yield is64.0%,coal gas yield is 7.6%,and the volume fraction of CH4,CO and H2 in pyrolysis gas is25.34%,31.51% and 22.19%,respectively,the heat value is 15.14 MJ/m3.The content of—OH,mononuclear aromatic hydrocarbon,—CH2 and—CH3 in coal tar are higher,tar is in the trend of lightening with 7 MPa.