基于响应面法的湿牛粪与稻草共热解产富氢燃气研究

CO-PYROLYSIS CHARACTERISTICS OF WET CATTLE MANURE AND STRAW FOR HYDROGEN-RICH GAS BASED ON RESPONSE SURFACE METHOD

采用Box-Benhnken试验方法,以稻草添加比例、热解温度、升温速率为自变量建立湿牛粪与稻草共热解过程中总产气率、H2产率和燃气热值的响应面模型,并基于模型深入分析各自变量对响应值的影响与作用规律。结果表明,3个响应值的方差统计量均小于0.01,差异性高度显著,即响应面模型能准确描述各自变量与响应值之间的映射关系;热解温度的升高和升温速率的增大有利于提高总产气率和H2产率,但燃气热值有一定减小,而随稻草添加比例的增大,总产气率和H2产率相应减小且同时燃气热值增大;从操作因素对响应值影响的差异性水平来看,3个操作因素对总产气率和H2产率作用的差异性显著程度为：热解温度〉稻草添加比例〉升温速率,而对燃气热值则为：稻草添加比例〉升温速率〉热解温度。

Response surface model for the total gas production rate,hydrogen production rate,and heating value of theproduced gas during the co-pyrolysis process of wet cattle manure and straw is developed using Box-Benhnkenexperimental method.In the model,the independent variables include straw ratio,pyrolysis temperature,and heatingrate.Results imply that the response surface model is enough accurate for representing the mapping relationship betweenthe independent variables and the response outputs,since the variance statistics of the outputs are all less than 0.01.Moreover,with increasing the pyrolysis temperature and heating rate,the total gas production rate and hydrogenproduction rate increase,but the heating value of the produced gas decreases.On the other hand,with increasing thestraw ratio,the changing tendencies for the three outputs are just contrary.In addition,the difference level of theindependent variables for the response outputs is also conducted.The order of strength for the total gas production rateand hydrogen production rate is as follows：pyrolysis temperature straw ratio heating rate,and for the heating valueof the produced gas is as follows：straw ratio heating rate pyrolysis temperature.