林木废弃物固定床气化试验研究

Experimental Investigations of Forestry Waste Gasification in Fixed-bed Gasifier

以生物质气化理论为依据,设计了一套小型下吸式气化系统,以大粒径的林木废弃物为原料进行气化试验研究。通过调节空气的流量,研究了当量比对产气组成、气体热值、气化效率、气体产量和木炭产量的影响。结果表明:大粒径的林木废弃物在气化炉内气化稳定,能产出优质的燃气及木炭;空气当量比存在一个最优值0.30。此时,气体组成如下:CO为21.6%,H2为11.3%,CH4为2.74%,CO2为12.0%,O2为1.44%,N2为51.0%,气体热值为4913kJ/m3,气化效率为62.1%,产气量为112m3/h,木炭产量为15.6kg。

In the present paper, A small -scale downdraft gasifier is designed with the principle of biomass gasification. An experimental investigation of the gasifier is carried out using forestry residues as the feed materials. The effect of equivalence ratio on the gas composition, calorific value , gasification efficiency, gas production yield and charcoal production output is studied. The experimental results showed that forestry residues can be converted into fuel gases and charcoal stably ; The results also indicated that the optimal equivalence ratio is 0.30. Under this optimum operation condition, the gases content in fuel gas are as follows： CO -21.5% ;H2 -11.3% ;CH4 -2.74% ;CO2 - 12.0% ;O2 - 1.44% ;N2 -51.0%. The low calorific value and the system gasification efficiency are 4913kJ/m^3 and 62.1%, respectively. In addition, gas production output： 112m^3/h; charcoal production output： 15.6kg.