共查询到19条相似文献,搜索用时 93 毫秒
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从流化床锅炉的旋风分离器出口烟道抽取高温烟气进行污泥干化,干化后的污泥与煤掺烧,是污泥处置方法之一.为掌握这种污泥干化掺烧系统的性能,通过热平衡计算分析了污泥掺烧比例和干化污泥含水率对烟气量、燃烧温度、受热面吸热量分配比例、抽取热烟比例、燃煤量的影响.结果表明:污泥掺烧会降低理论燃烧温度,增加炉内总烟气量.随着污泥干化程度和掺烧比例的升高,污泥干化所需抽热烟气的比例、炉膛和尾部烟道中受热面吸热量的比例都会增大;过大的污泥掺烧比例会导致炉膛尺寸显著大于尾部烟道,给锅炉设计带来困难.污泥干化程度和掺烧比例对节煤量的影响很小,污泥干化不能直接产生显著的节能效果;优选干化污泥含水率和掺烧比,其作用在于控制炉内烟气量和温度水平,优化焚烧炉和干化设备的配置,降低总投资成本. 相似文献
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研究了污泥干化设备的干化效率以及干化污泥掺烧后对300 MW燃煤锅炉的影响。通过对污泥干化设备的物料和能量平衡计算发现其干化效率达到了89.5%;通过污泥的不同掺烧比例试验,分析了掺烧干化污泥后对烟气和飞灰中二恶英和重金属含量、烟气中SO2等以及其他运行情况的影响,结论表明掺烧一定比例的污泥对锅炉的正常运行没有明显影响,而且添加适当比例的污泥可以优化锅炉的运行,对环境保护方面的贡献不言而喻。 相似文献
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《热能动力工程》2016,31(9)
本文介绍了污泥的基本特性,对直接热干化、间接热干化、直接-间接联合热干化和其它污泥干化技术的工作原理和优缺点进行了比较,重点讨论单独焚烧、电站锅炉掺烧、垃圾焚烧炉掺烧和水泥窑掺烧等污泥焚烧技术的工艺路线、应用情况和技术特点。分析可知,污泥干化焚烧技术类型多样,采用烟气或蒸汽对污泥进行干化都是可行的,干化污泥单独焚烧、电站锅炉掺烧或者水泥窑协同处置等都有成功案例,应根据具体条件选择合适的工艺,其中将污泥干化后利用流化床焚烧炉进行单独焚烧或在电站锅炉上进行掺烧是最具应用前景的技术路线,而污泥输送、高效干化技术与设备开发及厂区臭气治理等是有待进一步研究的问题。 相似文献
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现阶段新型污泥干化技术已经逐步成熟,将之用于印染污泥处理中时较之传统污泥挤压干化技术而言所取得效果更好.本文对新型污泥干化技术在印染污泥处理上的应用进行全面分析,并结合实际做出相应整理和总结. 相似文献
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目前国内污泥干化处置技术不同技术流派分别实现落地应用.应用较为广泛的常温深度脱水技术和间接式热干化技术均存在一定的缺点.本文通过污泥常温深度脱水和间接式热干化工艺的紧密结合,研发污泥联合干化处置系统,为大幅降低污泥处置运营成本,实现污泥减量化、无害化、稳定化、资源化处理的最佳途径提供一种选择. 相似文献
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研究了近年来比较新颖的一种处置污泥方法——微波裂解法。主要探讨了在输入功率为1 800 W的微波下,同种气氛时对250 g干的造纸污泥添加不同微波吸收剂以及在相同的前提条件下通入CO2和N2两种气体时造纸污泥微波裂解的效能影响规律。研究发现:在CO2气氛下,对造纸污泥中分别添加了5%的水、活性炭、NaOH和ZnCl2微波吸收剂后污泥的裂解效果明显变好,且可以看出添加了5%的NaOH后污泥微波裂解效果最好,污泥温度达到331℃;在相同的前提条件下污泥的微波裂解效果在不同气氛下也明显不同:在不添加任何微波吸收剂对干污泥进行裂解时,污泥在CO2气氛下裂解的最终温度只有85℃左右,甚至没有达到100℃,造纸污泥在N2气氛下裂解效果较好些,但对污泥添加了5%的水和NaOH后,污泥在CO2气氛下裂解效果较好些。上述研究结果为造纸污泥进行微波裂解时的适宜条件提供了一定的参考价值。 相似文献
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考虑到污泥处理的紧迫性和复杂性,结合工程的经济性原则,重点介绍了无害化处理城市污泥的系统方案——污泥干化焚烧.该系统采用空心桨叶污泥干燥机对污泥进行干燥、循环流化床炉对污泥进行焚烧,再利用余热锅炉吸收烟气热能产生蒸汽用于污泥干燥机对污泥进行干燥,实现了整个废弃物能源利用的最大化,降低了系统整体的运行费用.经过处理后的污... 相似文献
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Yanan Zhao Xiuyi Yan Jinghui Zhou Rui Li Shuai Yang Baofeng Wang Ruonan Deng 《能源学会志》2019,92(5):1451-1457
Oily sludge produced in petrochemical industries contains a large amount of toxic and hazardous substances. High oil sludge yield and high treatment cost have become major obstacles to the development of the petrochemical industry. In this study, the treatment and disposal of oily sludge using the wet oxidation method was investigated. Firstly, the orthogonal optimization experiment was designed to discuss the influence of reaction time, reaction temperature, oxidant amount, and emulsion splitter amount on the removal efficiency of oil and sludge volume. On this basis, a two-stage wet air oxidation method was employed to treat oily sludge. The results show that the two-stage oxidation method could remove 93.1% oil from the oil sludge and reduce the volume of oil sludge by 85.4%. Furthermore, the oil sludge treated with wet oxidation could be more easily separated from water, and the waste oil could be recycled. The proposed two-stage wet oxidation method shows excellent performance in treating oily sludge, from which resources can be recycled while reducing the amount of sludge. 相似文献
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Zhen Huang Genli Xu Zhengbing Deng Kun Zhao Fang He Dezhen Chen Guoqiang Wei Anqing Zheng Zengli Zhao Haibin Li 《International Journal of Hydrogen Energy》2017,42(40):25474-25491
Chemical looping gasification (CLG), with inherent characteristic of low pollutant emissions can realize the treatment and disposal principle of sewage sludge of harmlessness, reduction, stabilization and reutilization. This work attempted to investigate the feasibility of CLG of sewage sludge with hematite oxygen carrier. The role of hematite in CLG was firstly determined and it was used as gasification agent to provide the required oxygen for sludge conversion. Subsequently, the effect of various operating parameters on sludge CLG was discussed. An optimal mass ratio of sludge to hematite oxygen carrier was determined at 0.33 to achieve the high-efficient conversion of sludge. The reaction temperature of sludge gasification was set at 900 °C to avoid the excessive reduction of hematite. Suitable steam content was assigned to at 19.52%, where the sludge conversion attained the maximum. Ash deposited caused the decrease of specific surface area of hematite, but the accumulated mineral elements in sludge ash can improve the reactivity of oxygen carrier. Additionally, the ash accumulation also can prolong the gas mean residence time. Hence, the sludge conversion showed a slight uptrend with the cycle numbers. The phosphorus element of sludge was formed of CaH2P2O7 and CaHPO4 during the CLG. Although some sludge ash deposited on the surface of hematite particles, the new compounds were not observed in the reacted oxygen carrier. Additionally, sludge ash has a relatively high resistance trend for bed agglomeration and deposit formation due to the high content of Ca/Al elements. Consequently, the accumulation of sludge ash only reveals physical effects rather than chemical effects on the hematite particles. Thus, it is easy to separate the sludge ash from hematite particles according to the differences in density and size. 相似文献