摘要
将高湿污泥分别掺混木屑和核桃壳半焦调节湿度,掺混污泥造粒后进行湿颗粒热干化特性研究。分别通过热重分析仪与流化床进行层状干化和流化干化受热失水过程研究,分析了高湿污泥颗粒干化失水规律。结果表明,对于层状干化,3种颗粒干化过程均可分为4个阶段,其中污泥掺混半焦失重最大(61.8%),失重速率最快(9.0%/min),但吸收热量也最多,层状干化的失重速率在一定温度范围内与Z-L-T方程所描述的三维扩散吻合;流化干化的热源温度对于污泥颗粒干化有较大影响,160℃时纯污泥的干化失重最多,300℃时污泥掺混半焦与掺混木屑颗粒的干化失重相近,均优于纯污泥颗粒,流化干化过程的失水速率遵循Modified Page动力学模型;污泥颗粒入炉含湿量相近时,流化干化较层状干化具有明显的优势,各污泥颗粒均快速失水,含水率降至5%~10%。
In this study,high wet sludge were mixed with sawdust and nut shell char respectively to regulate its humidity and the thermal drying characteristics of the mixed wet sludge particles were investigated.Two kinds of drying methods,layering and fluidizing,were respectively used to analyze the heating and dehydration process of high wet sludge in thermal gravimetric analyzer(TGA)and fluidized bed.The drying law of high wet particles was finally summarized.The results indicated that for layer drying,all three types of particles can be divided into four drying stages.Among these sludge particles,the sludge mixed with char particles exhibited the largest weight loss(61.8%)and the fastest weight loss rate(9.0%/min),but it also absorbed the most heat.The weight loss rate in layer drying matched the three-dimensional diffusion described by the Z-L-T equation within a certain temperature range.The temperature of the heat source had a significant impact on the drying of sludge particles in fluidized drying.At 160℃,the pure sludge articles achieved the best drying effect.At 300℃,the sludge mixed with char or sawdust particles had similar drying effects,both of which were superior to pure sludge particles.The fluidized drying process followed the Modified Page kinetic model,and it had an advantage over layer drying when the sludge particles had the similar moisture content.All types of sludge particles quickly lost water and reached a moisture content of 5%~10%.
作者
孙国震
张伟
叶佳璐
梁文政
常国璋
李杰
王翠苹
SUN Guozhen;ZHANG Wei;YE Jialu;LIANG Wenzheng;CHANG Guozhang;LI Jie;WANG Cuiping(College of Civil Engineering and Architecture,Shandong University of Science and Technology,Qingdao 266590,China;Qingdao Tuandao Sewage Treatment Plant,Qingdao 266002,China)
出处
《山东科技大学学报（自然科学版）》
CAS
北大核心
2023年第6期66-74,共9页
Journal of Shandong University of Science and Technology(Natural Science)
基金
国家自然科学基金项目(52076125)
山东省自然科学基金重点项目(ZR2020KE040)。
