Study on the influence of sewage sludge coke expansion characteristics on the inhalable particle emission
JIA Li1, ZHANG Liu2, CHENG Peng1, CHEN Shi-hu1, WANG Chen-xing1, YU Yue3, WANG Jian-cheng4, ZHANG Jian-chun5, JIN Yan1
1. College of Electrical and Power Engineering, Taiyuan University of Technology, Taiyuan 030024, China; 2. China National Nuclear Corporation No. 7 Research & Design Institute Co., Ltd., Taiyuan 030012, China; 3. College of Economics and Management, Taiyuan University of Technology, Taiyuan 030024, China; 4. Key Laboratory of Coal Science and Technology of Ministry of Education and Shanxi Province, Taiyuan 030024, China; 5. Taiyuan Boiler Group Co., Ltd., Taiyuan 030024, China
Abstract：The constitutive relationship between combustion conditions and the expansion characteristics of sewage sludge was established by using a self-built fluidized bed experimental system, with influencing factors including combustion temperature, heating rate and sample particle size. Based on the evolution of the sewage sludge combustion mechanism obtained by differential scanning calorimetry (DSC), the emission characteristics of submicron particulate matter (PM1) and supermicron particulate matter (PM1-10) were investigated, and the microscopic characteristics of the formed particulate matter were combined to reveal the extended influence of the coke expansion characteristics of sewage sludge on the particulate matter emission pattern and the key mechanism of particulate matter formation. The results showed that the combustion process of sewage sludge under different heating conditions showed a similar pattern of variation with temperature, both consisting of two significant exothermic peaks and two gentle heat absorption peaks. The expansion rates of sewage sludge coke formed by combustion all showed a trend of increasing and then decreasing with increasing heating rate, mainly influenced by the volatile analysis process. There was an inverse relationship between the sample particle size and the expansion rate, and the combustion temperature influenced the expansion characteristics of sludge coke mainly by affecting the catalytic evolution of the internal structure of the particles. As the combustion temperature increased, the overall emission of particles tended to increase gradually.
王成鑫.污泥燃烧与污染物排放特性研究[D]. 合肥:中国科学技术大学, 2021. Wang C X. Research on sludge combustion and pollutant emission characteristics[D]. Hefei:University of Science and Technology of China, 2021.
[2]
房振全,满佳琪,刘菲菲,等.污泥焚烧细颗粒物中重金属赋存形态的研究[J]. 中国环境科学, 2020,40(7):3044-3053. Fang Z Q, Man J Q, Liu F F, et al. Study on the occurrence of heavy metals in fine particulate matter from sludge incineration[J]. China environmental science, 2020,40(7):3044-3053.
[3]
Li X K, Seth A, Zhang C R, et al. Evaluation of WRF-CMAQ simulated climatological mean and extremes of fine particulate matter of the United States and its correlation with climate extremes[J]. Atmospheric Environment, 2020,222:117181.
[4]
王琳,李德彬,刘子为,等.污泥处理处置路径碳排放分析[J]. 中国环境科学, 2022,42(5):2404-2412. Wang L, Li D B, Liu Z W, et al. Carbon emission analysis of sludge treatment and disposal path[J]. China Environmental Science, 2022,42(5):2404-2412.
[5]
李朋,吴华成,周卫青,等.民用燃煤不同燃烧阶段细颗粒物排放特征[J]. 中国环境科学, 2020,40(11):4652-4659. Li P, Wu H C, Zhou W Q, et al. Emission characteristics of fine particulate matter from residential coal combustion at different combustion stages[J]. China Environmental Science, 2020,40(11):4652-4659.
[6]
隋建才.燃煤过程中亚微米颗粒形成与排放的研究[D]. 武汉:华中科技大学, 2006. Sui J C. Study on formation and emission of submicron particles during coal burning[D]. Wuhan:Huazhong University of Science and Technology, 2006.
[7]
Yu Y, Xu M H, Yao H, et al. Char characteristics and particulate matter formation during Chinese bituminous coal combustion[J]. proceedings of the combustion institute, 2007,31:1941-1954.
[8]
周科,刘好文,刘天雨,等.市政污泥与煤混烧的颗粒物生成特性[J]. 中国电机工程学报, 2022,42(9):3286-3295. Zhou K, Liu H W, Liu T Y, et al. Particulate matter generation characteristics of municipal sludge mixed with coal[J]. Proceedings of the CSEE, 2022,42(9):3286-3295.
[9]
Zhou A, Ma W, Ruan R, et al. Submicron particle formation from co-firing of coal and municipal sewage sludge[J]. Journal of Environmental Management, 2022,311:114863.
[10]
Hower J C, Graese A M, Klapheke J G. Influence of microlithotype composition on hardgrove grindability for selected eastern Kentucky coals[J]. International Journal of Coal Geology, 1987,7(3).
[11]
施媛媛,颜枫,陈晶晶,等.花生壳掺烧对市政污泥燃烧性能的影响[J]. 中国环境科学, 2022,42(8):3796-3803. Shi Y Y, Yan F, Chen J J, et al. Effect of peanut shell blending on the combustion performance of municipal sludge[J]. China Environmental Science, 2022,42(8):3796-3803.
[12]
Jia L, Fan B G, Li B, et al. Effects of Pyrolysis Mode and Particle Size on the Microscopic Characteristics and Mercury Adsorption Characteristics of Biomass Char[J]. BioResources, 2018,13(3):1564− 1570.
[13]
Sui J C, Xu M H, Qin J H, et al. Numerical simulation of ash vaporization during pulverized coal combustion in the laboratory-scale single-burner furnace[J]. Energy & Fuels, 2005,19:1536-1541.
[14]
Liu X W, Xu M H, Yao H, et al. The Formation and Emission of Particulate Matter during the Combustion of Density Separated Coal Fractions[J]. Energy & Fuels, 2008,22(6):3844-3851.
[15]
费灵子,赵兵涛,刘建建.生物质与煤混燃PM10排放特性及机理的现状与发展[J]. 燃烧科学与技术, 2020,26(6):588-596. Fei L Z, Zhao B T, Liu J J. Mixed combustion of biomass and coal PM10current status and development of emission characteristics and mechanisms[J] Combustion Science and Technology, 2020,26(6):588-596.
[16]
Zhang L H, Huang Y J, Duan, F. Pore structure and fractal analysis for char of sludge blended with calcium magnesium acetate during pyrolysis process[J]. Asia-pacific journal of chemical engineering, 2016,11(5):705-713.
[17]
Yu D X, Xu M H, Yu Y, et al. Swelling behavior of a Chinese bituminous coal at different pyrolysis temperatures[J]. Energy & Fuels, 2005,19(6):2488-2494.
[18]
徐明厚,于敦喜等.燃煤可吸入颗粒物的形成与排放[M]. 科学出版社, 2009:6. Xu M H, Yu D X, et al. Formation and emission of inhalable Particulate Matter from coal Burning[M]. Science Press, 2009:6.
[19]
Hao Z D, Yang B Q, Jahng D J. Combustion characteristics of biodried sewage sludge[J]. Waste Management, 2018,72:296-305.
[20]
Buhre B J P, Hinkley J T, Gupta R P, et al. Fine ash formation during combustion of pulverized coal-coal property impacts[J]. Fuel, 2005,85(2):185-193.
[21]
Liu S Q, Niu Y Q, Wen L P, et al. Effects of physical structure of high heating-rate chars on combustion characteristics[J]. Fuel, 2020,266.
[22]
朱荣锦.温度/碱金属碳酸盐对焦炭结构及性能影响[D]. 重庆:重庆大学, 2019. Zhu R J. Effect of temperature/alkali carbonate on structure and properties of coke[D]. Chongqing:Chongqing University, 2019.
[23]
Zhang J H, Sun G, et al. Co-combustion of textile dyeing sludge with cattle manure:Assessment of thermal behavior, gaseous products, and ash characteristics[J]. Journal of Cleaner Production, 2020,253:119950-119963.
[24]
Liu Y, Ran C M, Siddiqui A R, et al. Pyrolysis of sewage sludge in a benchtop fluidized bed reactor:Characteristics of condensates and non-condensable gases[J]. Renewable Energy, 2020,160:707-720.
