工艺水循环对玉米秸秆水热碳化影响的实验研究

Experimental study on effect of process water cycle on hydrothermal carbonization of corn straw

为了探究工艺水循环对水热碳化产物特性的影响,以玉米秸秆为原料,在240℃,120 min和液固比为20的实验条件下,分别开展纯水和工艺水的水热碳化实验研究.结果表明,工艺水中溶解的有机酸促进了玉米秸秆宏观组分水解,增强了反应活性,有效增加了液相有机化合物,水热循环目标产物的质量产率和高位热值随循环次数而升高,循环5次后,其能量回收效率提高到62.97%.结合FTIR与XRD的分析结果,工艺水促进了秸秆原料脱水、脱羧反应,加速催化纤维素晶体结构降解,提高了水热炭芳香化程度.根据TG-DTG图像显示,工艺水参与反应后,水热产物的燃烧性能得到明显改善.

In order to explore the influence of process water circulation on the characteristics of hydrothermal carbonization products,the experimental research on hydrothermal carbonization of pure water and process water was carried out with corn straw as raw material under the experimental conditions of 240℃,120 min and liquid-solid ratio of 20.The research conclusions are as follows:the organic acids dissolved in the process water promote the hydrolysis of macro components of corn straw,enhance the reaction activity,and effectively increase the liquid-phase organic compounds.The mass yield and high calorific value of the target product of hydrothermal cycle increase with the number of cycles.After 5 cycles,the energy recovery efficiency increases to 62.97%.Combined with the analysis results of FTIR and XRD,the process water promoted the dehydration and decarboxylation of straw raw materials,accelerated the degradation of cellulose crystal structure,and improved the aromatization degree of hydrothermal carbon.According to the TG-DTG image,the combustion performance of hydrothermal products was significantly improved after the process water participated in the reaction.