城市污泥与兰炭末磷酸法自黏结成型机理研究
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摘要
将磷酸加入到城市污泥和兰炭末中制备型焦,测试了型焦生块和熟块的主要性能指标,并与陕西省洁净型煤标准进行对比,利用热重和红外光谱分析型焦自黏结成型的机理。结果表明,加入磷酸后,污泥和兰炭末型焦生块的热解新增一个失重阶段,在184℃出现一个最大失重速率点,对应为磷酸氢盐分解、脱水及缩聚等生成无机高分子黏结剂,进而包裹、黏结兰炭末成型。污泥中重金属含量极低,磷酸氢盐的生成量很少,型焦熟块可以成型且绝大部分指标满足陕西省洁净型煤标准,但跌落强度远不符合要求。
The formed coke was prepared from municipal sludge and fine semi-coke by adding phosphoric acid and the main performance indexes of raw block and ripe block were tested, which were compared with clean briquette standard of shaanxi province. The results showed that when phosphoric acid was added to sludge and fine semi-coke, pyrolytic reaction of block appeared a new degradation stage, which had a maximum degradation rate poin at 184 ℃ and it was corresponding to the decomposition of hydrogen phosphate, dehydration and polycondensation to form inorganic polymer binder and then wrapped, bonded fine semi-coke. Because the heavy metal content in sludge was very low, the production of hydrogen phosphate was very small. The ripe block of formed coke can be formed and most of the indexes meeted clean briquette standard of shaanxi province, but the drop strength was far from meeting the requirements.
The formed coke was prepared from municipal sludge and fine semi-coke by adding phosphoric acid and the main performance indexes of raw block and ripe block were tested, which were compared with clean briquette standard of shaanxi province. The results showed that when phosphoric acid was added to sludge and fine semi-coke, pyrolytic reaction of block appeared a new degradation stage, which had a maximum degradation rate poin at 184 ℃ and it was corresponding to the decomposition of hydrogen phosphate, dehydration and polycondensation to form inorganic polymer binder and then wrapped, bonded fine semi-coke. Because the heavy metal content in sludge was very low, the production of hydrogen phosphate was very small. The ripe block of formed coke can be formed and most of the indexes meeted clean briquette standard of shaanxi province, but the drop strength was far from meeting the requirements.
引文
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[3]SIEBIELEC G,SIEBIELEC S,LIPSKI D.Long-term impact of sewage sludge,digestate and mineral fertilizers on plant yield and soil biological activity[J].Journal of Cleaner Production,2018,187:372-379.
[4]YANG K,ZHU Y,SHAN R R,e tal.Heavy metals in sludge during anaerobic sanitary landfill:speciation transformation and phytotoxicity[J].Journal of Environmental Management,2017,189:58-66.
[5]LI H,JIN C,MUNDREE S.Hybrid environmental and economic assessment of four approaches recovering energy from sludge with variant organic contents[J].Journal of Cleaner Production,2017,153:131-138.
[6]陶明涛,张华.城市污泥处理过程中有机成分的变化[J].环境保护与循环经济,2012(10):53-56.
[7]闫志成.污水污泥热解特性与工艺研究[D].哈尔滨:哈尔滨工业大学,2014.
[8]谢建麟,段泽琪,张新,等.城市污水厂污泥制型煤的研究[J].武汉城市建设学院学报,1992,9(1/2):105-109.
[9]董平,张鑫,矫健.干化污泥型煤抗压强度的实验研究[J].洁净煤技术,2010,16(2):26-29.
[10]任志荣,陈晨,贺娟,等.含油污泥为粘结剂制备型煤的研究[J].西安科技大学学报,2013,33(5):589-592.
[11]唐黎华,朱子彬,赵庆祥,等.活性污泥作为气化用型煤粘结剂的研究Ⅱ.污泥型煤的气化特性与二次污染的考察[J].环境科学学报,1999,19(1):91-94.
[12]张大康,吴建平,田文艳.污泥型煤在链条炉的燃烧新探[J].环境科学与管理,2008,33(1):53-55.
[13]张大康,吴建平,田文艳.以污泥为黏合剂的型煤固硫助燃新探[J].节能技术,2007,25(146):569-571.
[14]王爱民,白妮,孙志勇,等.城市污泥作为型焦粘结剂的工艺及机理研究[J].硅酸盐通报,2016,35(11):3664-3668.
[15]王爱民,白妮,陈锦中,等.磷酸抑制城市污泥高温过程中重金属挥发的研究[J].非金属矿,2018,41(1):94-97.
[16]魏美玲,赵小玻.无机粘结剂研究进展[J].现代技术陶瓷,2007,27(1):28-31.