生物质高温水蒸气气化热力学模拟研究

Thermal simulation research on high-temperature gasification of biomass with steam

生物质炭水蒸气气化是一种高效、环保的生物质能利用技术.本文选取三种代表性的生物质,松木、秸秆和稻壳为研究对象,采用化工流程模拟软件Aspen Plus建立生物质高温水蒸气气化模型,探讨生物质种类、温度对气化指标的影响,为今后的实验研究提供理论参考依据.结果表明:不同生物质在模拟条件下具有一些相似的热解气化特性,且三种生物质的各项最佳气化指标顺序为,松木>秸秆>稻壳.当温度为800℃时,松木、秸秆、稻壳的反应程度最大,合成气体比例为H_2>CO>CO_2>CH_4,生成的H_2量依次为44.84,42.65,39.84 mol·L^(-1),CO量为35,32.22,27.47 mol·L^(-1),CH_4为0.49,0.37,0.24 mol·L^(-1),非燃性气体CO_2为4.04,4.47,5.27 mol·L^(-1),低位热值为11.18,11.04,10.08 MJ/m^3,碳转化率为99.25%,95.02%,85.51%.

The gasification of biomass carbon to produce high calorific value and hydrogen rich gas is a kind of high efficieronmental protection technolog. Three kinds of typical biomass such as pine, strawand ricc husk, were selected as objects, and thehigh temperature steam gasification biomass model was established by using chemical process simulation software Aspenprovide theoretical reference for future study. The influence of different types of biomass and tempestudied. It showed that different biomass had some similar pyrolysis gasification characteristics under the simulated conditions, and the best gasification indexes order is as follows： pine 〉 straw 〉 rice husk; when temperature is 800 ℃ , the reaction content of pine, straw, ricc husk is the best,with the synthetic gas proportion being H 〉 CO 〉 CO 2 〉 CH4. Frompine, strawof H2 is 44. 84 , 42.65 , 39.84 mol · L ^-1, respectively; CO is 35,32.22 , 27.47 mol · L ^-1, respectively; CH4 is 0.49 , 0.37 ,0.24 mol· L ^-1 , respectively; CO2 is 4. 04, 4. 47, 5. 27 mol · L ^-1 , respectively; lower calorific value is 11. 18, 11. 04,10. 08 MJ/m^3 , respectively; and carbon conversion rate is 99. 25% , 95. 02% , 85. 51% , respectively.