冷冻对脱水污泥干燥与燃烧特性的影响

Abstract
Figure/Table
References
Related Citation (15)

Download: PDF (448 KB) HTML (1 KB)
Export: BibTeX | EndNote (RIS)

Abstract This work explored the effect of freezing operation on the drying and combustion characteristics of dewatered sludge and different freezing temperatures on the characteristics of the drying process for the sludge. In addition, the effect of different freezing temperatures and heating rates on the combustion characteristics of dewatered sludge were investigated by thermogravimetric analysis (TG-DTG). Then the dynamics analysis was carried out. The results indicated that compared with the original sludge, freezing turned the dewatered sludge into a hard structure that can be crushed, and when the temperature was dropped to –20℃, the drying rate of the crushed sludge was improved by 41.46%, and the drying time was shortened by 41.67%. Three degradation stages, dehydration, combustion of volatile and combustion of the fixed carbon were identified in the combustion process of the freezing dewatered sludge. As the temperature decreased, the ignition point, the volatile releasing index, the flammability index, the burnout index, and the general combustion index increased. According to the dynamics analysis, the reaction order of pre-peak was 0.9 and post-peak was 1.1. The apparent activation energy of the frozen sludge was higher than that of the original sludge, and as the temperature decreased, the apparent activation energy would decrease.

Key words： dewatered sludge freezing temperature crushed sludge drying effect combustion characteristics kinetics

Received: 14 May 2021

PACS:

X703

	Service

	E-mail this article
	Add to my bookshelf
	Add to citation manager
	E-mail Alert
	RSS
	Articles by authors
	MENG Qi
	YANG Tao
	YANG Cheng-jian
	AN Miao
	LI Zhi-hua

Cite this article:

MENG Qi,YANG Tao,YANG Cheng-jian等. Effect of freezing on drying and combustion characteristics of dewatered sludge[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(1): 127-134.

URL:

http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I1/127

[1]	Seggiani M, Puccini M, Raggio G, et al. Effect of sewage sludge content on gas quality and solid residues produced by cogasification in an updraft gasifier [J]. Waste Management, 2012, 32(10): 1826–1834.
[2]	Magdziarz A, Werle S. Analysis of the combustion and pyrolysis of dried sewage sludge by TGA and MS [J]. Waste Management, 2014, 34(1): 174-179.
[3]	Lee H S, Bae S K. Combustion kinetics of sewage sludge and combustible wastes [J]. Journal of Material Cycles and Waste Management, 2009, 11(3): 203-207.
[4]	范海宏, 苏琦, 韩丁. 利用同步热分析仪研究碱解污泥的燃烧特性[J]. 环境工程学报, 2011, 5(7): 1627-1632. Fan H H, Su Q, Han D. Investigation on the combustion characteristics of alkali-decomposed sludge using simultaneous thermal analyzer. Chinese Journal Environmental Engineering, 2011, 5(7): 1627.
[5]	曾佳俊, 孙水裕, 陈楠纬, 等. 调理剂FeCl3/CaO对深度脱水市政污泥燃烧特性的影响[J]. 环境科学学报, 2015, 35(6): 1842-1850. Zeng J J, Sun S Y, Chen N W, et al. Effects of FeCl3/CaO as conditioner on the combustion characteristics of deeply dewatered sewage sludge[J]. Acta Scientiae Circumstantiae, 2015, 35(6): 1842-1850.
[6]	许桂英, 胡团桥, 魏和涛, 等. Fenton/CaO调理污泥与生物质成型燃料燃烧污染物排放[J]. 中国环境科学, 2021, 41(5): 2108-2116. Xu G Y, Hu T Q, Wei H T, et al. Study on gas pollutants emission characteristics of Fenton/CaO conditioned municipal sludge and biomass mixed fuels combustion [J]. China Environmental Science, 2021, 41(5): 2108-2116.
[7]	李洋洋, 金宜英, 李欢. 采用热重分析法研究煤掺烧干污泥燃烧特性[J]. 中国环境科学, 2011, 31(3): 408-411. Li Y Y, Jin Y Y, Li H. Thermogravimetric analysis and co-combustion characteristics of dried sludge and coal [J]. China Environmental Science, 2011, 31(3): 408-411.
[8]	方兴, 李志华, 杨成建. 冷热联用对市政脱水污泥低温干燥的影响[J]. 中国环境科学, 2020, 40(6): 2546-2553. Fang X, Li Z H, Yang C J. Effect of combined cooling and heating methods on low-temperature drying of municipal dewatered sludge [J]. China Environmental Science, 2020, 40(6): 2546-2553.
[9]	赵寒絮, 张海侠, 闫玉乐. 超低温破碎技术在固废检测中的应用[J]. 中国检验检测, 2019, 27(4): 26-27, 9. Zhao H X, Zhang H X, Yan Y L. Application of Ultra-low Temperature Crushing Technology in Solid Waste Disposal [J]. China Inspection Body & Laboratory, 2019, 27(4): 26-27, 9.
[10]	GB/T212-2008煤的工业分析方法[S]. GB/T212-2008 Proximate analysis of coal [S].
[11]	马学文, 翁焕新. 温度与颗粒大小对污泥干燥特性的影响[J]. 浙江大学学报(工学版), 2009, 43(9): 1661-1667. Ma X W, Weng H X. Effects of temperature and granule size on sludge drying characteristics [J]. Journal of Zhejiang University (Engineering Science), 2009, 43(9): 1661-1667.
[12]	Zhang X, Chen M, Huang Y. Isothermal drying kinetics of municipal sewage sludge coupled with additives and freeze–thaw pretreatment [J]. Journal of Thermal Analysis & Calorimetry, 2017, 128(2): 1195-1205.
[13]	刘长燕, 葛仕福. 污泥干燥特性及其模型[J]. 化工装备技术, 2010, 31(1): 1-4, 7. Liu C Y, Ge S F. The sludge drying characteristics and model [J]. Chemical Equipment and Technology, 2010, 31(1): 1-4, 7.
[14]	曾武勇, 金晶, 张号, 等. 两种典型污泥热解特性及动力学机理[J]. 燃烧科学与技术, 2013, 19(6): 544-548. Zeng W Y, Jin J, Zhang H, et al. Pyrolysis Characteristics and Kinetics Mechanism of Two Typical Sludge [J]. Journal of Combustion Science and Technology, 2013, 19(6): 544-548.
[15]	Nowicki L, Ledakowicz S. Comprehensive characterization of thermal decomposition of sewage sludge by TG–MS [J]. Journal of Analytical and Applied Pyrolysis, 2014, 110: 220-228.
[16]	刘敬勇, 傅杰文, 孙水裕, 等. 不同来源污泥混燃特性及其综合燃烧性能评价[J]. 环境科学学报, 2016, 36(3): 940-952. Liu J Y, Fu J W, Sun S Y, et al. Co-combustion of various sources of sludge and its combustion performance [J]. Acta Scientiae Circumstantiae, 2016, 36(3): 940-952.
[17]	陈悦佳. 冻结融溶—微生物燃料电池强化剩余污泥破解与产电性能[D]. 哈尔滨: 哈尔滨工业大学, 2015. Chen Y J, Enhanced disintegration and electricity generation of sewage sludge by freezing/thawing microbial fuel cell [D]. Harbin: Harbin Institute of Technology, 2015.
[18]	冯劲, 施庆珊, 冯静, 等. 不同干燥方式对细菌纤维素物理性能的影响[J]. 现代食品科技, 2013, 29(9): 2225-2229, 2101. Feng J, Shi Q S, Feng J, et al. Effects of different drying processes on physical properties of bacterial cellulose membranes [J]. Modern Food Science Technology, 2013, 29(9): 2225-2229, 2101.
[19]	刘敬勇, 黄李茂, 宁寻安, 等. 城市干污泥与水葫芦的混燃特性分析[J]. 环境科学学报, 2016, 36(8): 2955-2967. Liu J Y, Huang L M, Ning X A, et al. Analysis of co-combustion characteristics of sewage sludge and water hyacinth [J]. Acta Scientiae Circumstantiae, 2016, 36(8): 2955-2967.
[20]	徐启智, 梁嘉林, 张斯玮, 等. 调理剂Fenton/CaO对深度脱水市政污泥燃烧特性的影响[J]. 环境科学学报, 2018, 38(7): 2711-2720. Xu Q Z, Liang J L, Zhang S W, et al. Effects of Fenton/CaO as conditioner on the combustion characteristics of deeply dewaterd sewage sludge [J]. Acta Scientiae Circumstantiae, 2018, 38(7): 2711-2720.
[21]	Wu D J, Norman F, Verplaetsen F. Experimental study on the minimum ignition temperature of coal dust clouds in oxy-fuel combustion atmospheres [J]. Journal of Hazardous Materials, 2016, 307: 274-280.
[22]	Idris S S, Rahman N A, Ismail K. Combustion characteristics of Malaysian oil palm biomass, sub-bituminous coal and their respective blends via thermogravimetric analysis (TGA) [J]. Bioresource Technology, 2012, 123: 581-591.
[23]	Vesilind P A, Martel C J. Freezing of water and wastewater sludges [J]. Journal of Environmental Engineering, 1990, 116(5): 854-862.
[24]	陈建原, 孙学信. 煤的挥发分释放特性指数及燃烧特性指数的确定[J]. 动力工程学报, 1987, (5): 13-18, 61. Chen J Y, Sun X X. Determination of volatile matter release characteristic index and combustion characteristic index of coal. [J]. Journal of Chinese Society of Power Engineering, 1987(5): 13-18, 61.
[25]	胡勤海, 等. 城市污泥掺制水煤浆燃烧动力学特性[J]. 环境科学学报, 2008, (6): 1149-1154. Hu Q H, et al. Study on combustion kinetics of coal water slurry prepared with sewage sludge [J]. Acta Scientiae Circumstantiae, 2008, (6): 1149-1154.
[26]	聂其红, 孙绍增, 李争起, 等. 褐煤混煤燃烧特性的热重分析法研究[J]. 燃烧科学与技术, 2001, (1): 72-76. Nie Q H, Sun S Z, Li Z Q, et al. Thermogravimetric analysis on the combustion characteristics of brown coal blends [J]. Journal of Combustion Science and Technology, 2001, 7(1): 72-76.
[27]	Shen B X, Liu D C, Lu J D. Study on ignition and combustion of petroleum coke [J]. Petroleum Processing and Petrochemical, 2000, 3(10): 60-64.
[28]	陈镜泓, 李传儒. 热分析及其应用[M]. 北京: 科学出版社, 1985: l20-l32. Chen J H, Li C R. Thermal analysis and application[M]. Beijing: Science Publishing House, 1985.
[29]	JohnW Cumming. Reactivity assessment of coals via a weighted mean activation energy [J]. Fuel, 1984, 63(10): 1436-1440.