生物质颗粒燃料的多孔床料流化床气化试验研究

TEST STUDY ON POLLETIZED BIOMASS FUEL IN FLUIDIZED BED GASIFICATION WITH POROUS BED MEDIA

在自制的小型常压流化床内采用多孔介质床料对生物质颗粒燃料进行气化试验,分别考察了富氧气氛下温度和氧气浓度、水蒸气气氛下温度和水蒸气流量及不同种类多孔床料对生物质颗粒燃料气化的产气成分及产气热值的影响。试验结果表明:随气化温度的升高,产气中H2含量增加,CH4含量降低,产气热值降低;氧气浓度对气化有一定影响,在试验条件下,增大氧气浓度可以提高产气中H2含量;随着水蒸气流量的增加,产气中H2含量从11.89%增加到45.77%,但产气热值降低;在3种不同的多孔介质床料中,以沸石为床料时气化产H2效果最好。

The gasification test of adopting petterized biomass fuel as porous media has been carried out on a self- made small atomospheric pressure fluidized bed,investigating the effects of various factors, such as gasification temperiture and oxygen concentration （under rich oxygen atomosphere）, gasification temperature and steam flow rate（under steam atomosphere）,as well as different kinds of bed media upon the composition and calorific value of produced gas respectively. Results of test show that the H2 content has increased,the CH4 content having dereased,and the calorific value of produced gas being decreased along with the gasification temperature rise; the oxygen concentration has certain effects on gasification,the Hz content in produced gas can be increased by heightening the oxygen concentration;along with the increase of steam flow rate, the Hz content in produced gas has been increased from 11.89 % to 45.77 %, however, the calorific value of produced gas being decreased. In three kinds of different bed media,taking zeolite as bed medium has the best effect of H2 production.