近临界水处理废弃烟梗工艺优化  

Optimization of near critical-water treatment process of tobacco stems

作　　者：王浩然 殷全玉[1] 方明 侯建林 李军 何斌 张明月 WANG Haoran;YIN Quanyu;FANG Ming;HOU Jianlin;LI Jun;HE Bin;ZHANG Mingyue(Tobacco College,Henan Agricultural University,Zhengzhou 450002,Henan,China;Chenzhou Branch of Hunan Provincial Tobacco Company,Chenzhou 423000,Hunan,China)

机构地区：[1]河南农业大学烟草学院,河南郑州450002 [2]湖南省烟草公司郴州市公司,湖南郴州423000

出　　处：《化工进展》2023年第9期5019-5027,共9页Chemical Industry and Engineering Progress

基　　金：河南省科技研发计划联合基金(222103810005);河南省高等学校重点科研项目(23A210022);湖南省烟草公司郴州市公司科技项目(2021431000240173)。

摘　　要：为了探究近临界水(NCW)处理烟梗获得植物营养液和生物炭的最优处理工艺,采用正交试验设计,对NCW处理烟梗工艺进行优化,设计了料液比、反应温度和反应时间的三因素三水平正交试验。结果表明:①NCW液化烟梗的最优处理组合为料液比1∶14,温度180℃,时间15min,烟梗生物炭产率最高和气化率最低的条件均为料液比1∶4,温度180℃,时间15min;②NCW液化烟梗制备植物营养液中有机质、总氮磷钾和中微量元素含量的最优处理条件均料液比1∶4,温度180℃,时间15min;③结合工艺优化目标与植物营养液质量进行综合评价,T9为最优处理,在此处理下,烟梗液化率51.8%,生物炭产率31.8%,综合利用率达83.6%。获得的植物营养液有机质含量(63.1±1.2)g/L,氮磷钾(N+P_(2)O_(5)+K_(2)O)总含量(5.748±0.017)g/L,中微量元素含量(101.0±3.2)mg/L,达到相关企业标准,可以作为植物营养液使用。To explore the optimal treatment process of plant nutrient solution and biochar obtained from tobacco stem treated with near-critical water(NCW),an orthogonal test design was used to investigate the effects of different factors(solid-liquid ratio,temperature,and reaction time)on the liquefaction rate,biochar yield,gasification rate and nutrient content in the liquid phase.The article analyzed the optimum process conditions of tobacco stems with near-critical water by using the combined analysis of extreme difference,variance analysis and affiliation function.The results showed that:①The optimal treatment combination of NCW liquefaction tobacco stem was the material-liquid ratio 1∶14,180℃and 15min.The conditions with the highest biochar yield and the lowest gasification rate were the liquid ratio 1∶4,180℃and 15min.②The optimal treatment conditions for the content of organic matter,total nitrogen,phosphorus,kalium,medium and trace elements in the liquid were 1∶4,180℃and 15min,respectively.③Combined with the process optimization target and the quality of plant nutrient solution,T9 was the optimal treatment.Under this treatment,the liquefaction rate of tobacco stem was 51.8%,the biochar yield was 31.8%,and the comprehensive utilization rate was 83.6%.The organic matter content of the plant nutrient solution was(63.1±1.2)g/L,the total content of nitrogen,phosphorus and potassium(N+P_(2)O_(5)+K_(2)O)was(5.748±0.017)g/L,and the content of medium trace element was(101.0±3.2)mg/L,which met the relevant enterprise standards and could be used as plant nutrient solution.

关 键 词：近临界水 烟梗 正交试验 植物营养液 生物炭 

分 类 号：TQ449.6[化学工程—化学肥料工业]