玉米秸秆颗粒燃料热解气化试验研究

Experimental Research on Gasification and Pyrolysis Using Corn Stalk Pellets

以玉米秸秆颗粒燃料为原料，研究了生物质空气热解气化（下吸式固定床气化炉）、富氧热解气化（鼓泡式流化床气化炉）和无氧热解气化（慢速连续热解气化炉）的热解气化特性.三种热解气化装置并联，共用一个控制系统，产生的生物质燃气经过冷凝器等后进入储气柜.燃气成分由气相色谱分析，成型颗粒、颗粒炭、生物油热值采用快速量热仪测量分析.结果显示，空气热解气化在热解温度为660~670℃时燃气低热值最高，约为3.91~4.44 MJ/Nm3；富氧热解气化燃气低热值最高可达8.48~9.38 MJ/Nm3（热解气化温度为575~750℃时）；无氧热解气化在热解温度为380~530℃时的燃气低热值约为14.51~16.49 MJ/Nm3，并可联产生物炭、生物油等.

In this paper the performance of three types of gasification and pyrolysis reactors-downdraft,bubbling, and pyrolysis were evaluated in terms of thermal output using the same corn stalk pellets. The three reactors were connected in parallel with a common control system,condenser,root blower,gas tank,and gas chromatography （GC）system. Gas composition was analysed using two GC columns. The lower heating values（LHVs）of the pellets, pellets charcoal,and bio-oil were analysed using a rapid screening device. Analysis of the properties of the pellets and pellets charcoal were carried out using an automatic proximate analyser. In the downdraft reactor ,gas with an LHV of 3.91~4.44 MJ/Nm3 was obtained at a reduction zone temperature（RZT）of 660~760 ℃. In the bubbling reactor,gas with an LHV of 8.48~9.38 MJ/Nm3 was obtained at an RZT of 575~750℃. In the pyrolysis reactor,gas with an LHV of 14.51~16.49 MJ/Nm3 was obtained at a pyrolysis temperature（PT）of 380~530 ℃,and pellets charcoal and bio-oil were formed in the pyrolysis reactor as gas-assisted products .