循环流化床气化温度对稻壳气化固相产物特性的影响

为解决燃煤机组耦合生物质气化发电过程中固相产物的妥善利用问题,以稻壳为原料,在襄阳电厂6#燃煤机组耦合生物质循环流化床上,考察了稻壳气化发电时气化温度对燃气组分以及固相产物的含碳量、比表面积、微观形貌和吸附能力的影响。结果表明:燃气主要可燃成分CO和H_(2)随温度升高先增大后减小,当温度为775℃时达到最高值,分别为18.79%和7.83%,625~775℃燃气热值高,固相产物含碳量较高;在较低的气化温度条件下,固相产物孔结构发育更加完全,且孔隙数量增加,孔壁厚度中等,比表面积随温度降低而不断增加;碘吸附值和比表面积基本线性相关;625℃时,固相产物比表面积最大为145.3 m^(2)/g,碘吸附值最大为265 mg/g,可应用于消耗大、对吸附能力要求不高的场所。

Effect of Gasification Temperature of Circulating Fluidized Bed on Solid Product Feature of Rice Husk Gasification

In order to resolve the utilization of solid-phase product generated in the process of coal-fired coupling biomass circulating fluidized bed gasification power generation, the effect of gasification temperature on fuel gas components, carbon content, specific surface area, micromorphology and adsorption capacity of the solid-phase products was investigated in Xiangyang power plant 6# unit with rice husk as the raw material. The results showed that, CO and H₂ contents in the gas increased first and then decreased with the increase of gasification temperature. When the temperature was 775 ℃, CO and H₂ contents arrived the highest values of 18.79% and 7.83%. During 625-775 ℃, a high calorific value of fuel gas, as well as the carbon content of solid-phase product, could be obtained. At a lower gasification temperature, a well-developed pore structure, an increased number of pores, and a medium thickness of pore wall could form and the larger specific surface area of solid-phase products increased by decreasing of the temperature. There was a linear correlation between the iodine adsorption value and the specific surface area. At 625 ℃, the maximum specific surface area of solid-phase products could be reached(145.3 m²/g), as well as the maximum adsorption capacity of iodine of 265 mg/g. The solid products are promising in the fields with a high consumption of adsorption materials while a relatively low demand for adsorption capacity.