喷动-载流床中粒径对内蒙霍林河褐煤快速热解产物的影响

Effect of Particle Size on Products from Flash Pyrolysis of Huolinhe Lignite in a Spouted-entrained Bed

在喷动-载流床内对霍林河褐煤进行了快速热解,考察了0.125~0.28 mm范围内煤粉颗粒粒径对煤热解总失重、热解产物产率以及气体和液体产物具体组成的影响. 气体和液体产物的组成分别利用气相色谱和色质联用仪分析. 实验表明, 随颗粒粒径增大,煤中挥发份脱出率略有降低,半焦产率略有升高,气体总产率增大,CH4,无机气体,C2H6,C3H8等呈现上升趋势. 而随颗粒粒径增大,液体产率降低,其中沥青质的降低较为显著. 正己烷可溶物产率随颗粒粒径增加有少许降低. 热解水产率随着颗粒粒径的增大而增加. 颗粒粒径对正己烷可溶物中的各类组份的含量也有一定的影响.

The flash pyrolysis of Huolinhe lignite was carried out in a spouted-entrained bed when particle size was in the range of 0.125~0.280 mm. The present investigation focuses on the effect of particle size on pyrolysis product distribution and gas and liquid compositions. Gas and liquid products were analyzed by gas chromatography and GCMS. The results showed that the yields of gas products, CO, H2 and C1~C5 hydrocarbons, increased with increasing particle size. Coal devolatilization degree and liquid product yield decreased with increasing particle size. Among liquid products, the yield of asphaltenes decreased most notably, on the contrary, pyrolysis water increased. Yields of hexane solubles were not severely affected by particles size,and decreased slightly with increasing particle size. Compositions of liquid products were strongly dependent on coal particle size. Phenol and aliphatic fractions decreased with increasing particle size, but aromatic fraction increased, and polar and basic fraction increased first and then decreased.