滚筒法OG泥−钢球接触式干燥过程实验  

Experiment on contact drying process of OG sludge and steel ball in rotary drum

作　　者：王兆宇 温治 苏福永[1,2] 邓升安 WANG Zhaoyu;WEN Zhi;SU Fuyong;DENG Sheng’an(School of Energy and Environmental Engineering,University of Science and Technology Beijing,Beijing 100083,China;Beijing Key Laboratory of Energy Saving and Emission Reduction for Metallurgical Industry,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]北京科技大学能源与环境工程学院,北京100083 [2]北京科技大学冶金工业节能减排北京市重点实验室,北京100083

出　　处：《中南大学学报（自然科学版）》2022年第6期2007-2016,共10页Journal of Central South University:Science and Technology

基　　金：国家重点研发计划项目(2016YFC0401201)。

摘　　要：针对目前OG泥热干燥工艺成本高、效率低等问题,提出一种利用热钢球作研磨介质和热载体的滚筒式污泥干燥新技术,并通过试验考察该技术的干燥效果。首先,设计并搭建滚筒干燥实验台;然后,确定OG泥含水率与表观状态的关系;最后,通过OG泥滚筒干燥过程试验,考察钢球直径、钢球初始温度和OG泥处理量对干燥过程污泥的温度、含水率及最终干燥结果的影响。研究结果表明:污泥干燥过程中会相继经历预热阶段、快速阶段和降速阶段,不同工况下的各干燥阶段的时间不同;最终干燥结果有3种,即完全干燥、少量结团和黏附筒壁;提高钢球初始温度或减少污泥处理量都可以提高污泥干燥效率和改善最终干燥效果;钢球直径越小,初始干燥速率越快;钢球直径越大,对污泥的破碎效果越好,可以干燥更多污泥;对于一定的钢球初始水当量(由钢球直径、个数和初始温度决定),存在一个最合适工况,该在工况下,干燥效率最高;污泥被完全干燥后,干基含水率低于4%,最终呈粉末状。Aiming at the high cost and low efficiency of the current OG sludge thermal drying process,a new drum-type sludge drying technology using hot steel balls as grinding media and heat carrier was proposed and the drying effect of this technology was investigated through experiments.Firstly,a drum drying experiment platform was designed and built.Then,the relationship between the OG sludge moisture ratio and the apparent state was determined.Finally,the effects of diameter of steel ball,initial temperature of steel ball and treatment amount of OG sludge on the temperature,moisture ratio and final drying result of the sludge during the drying process were investigated through the OG sludge drum drying process experiment.The results show that the sludge drying process will go through the preheating stage,the rapid stage and the deceleration stage successively.The duration time of each drying stage is different in different working conditions.The final drying result includes 3 kinds,namely complete drying,a little agglomeration and adhesion drum wall.Increasing the initial temperature of the steel ball or reducing the amount of sludge treatment can increase the efficiency of sludge drying and improve the final drying effect.The smaller the diameter of the steel ball,the faster the initial drying rate.The larger the diameter of the steel ball,the better the sludge crushing effect,and more sludge can be dried.For a certain initial water equivalent of steel ball(determined by the diameter,number and initial temperature of the steel ball),there is a most suitable working condition,under which the drying efficiency is the highest.After the sludge is completely dried,its dry basis moisture ratio is less than 4%and it is in powder form finally.

关 键 词：滚筒 OG泥 热干燥 含水率 

分 类 号：X705[环境科学与工程—环境工程]