Gaseous pollutants emissions from rotary kiln combustion of municipal sewage sludge

被引：0
|
作者：
Chen Y. [1 ]
Chen X. [1 ]
Ma J. [1 ]
Liang C. [1 ]
机构：
[1] Key Laboratory of Energy Thermal Conversion and Control, Ministry of Education, School of Energy and Environment, Southeast University, Jiangsu, Nanjing
来源：
Huagong Xuebao/CIESC Journal | 2023年 / 74卷 / 05期
关键词：
desulfuration; nitric oxide; rotary kiln; sludge; sulfur dioxide;
D O I：
10.11949/0438-1157.20230096
中图分类号：
学科分类号：
摘要：
The combustion experiments of municipal sludge were carried out on the rotary kiln test bench to study the effect of combustion temperature, particle size of sludge, and residence time in furnace and molar ratio of calcium to sulfur on the emission characteristics of gaseous pollutants during combustion. The results show that with the increase of incineration temperature, the emission concentration of SO2 increases obviously, but the rising trend slows down with the increase of temperature. The emission concentration of NO also increased with the increase of temperature, but the effect was relatively small. With the increase of sludge particle size, the emission concentration of SO2 decreased significantly, while the emission concentration of NO changed little. By reducing the furnace dip angle to prolong the residence time of sludge in the furnace, the emission of NO and SO2 showed an increasing trend, while the concentration of CO emission decreased. However, when the furnace dip angle changed in the range of 1.5°—2.5°, the emission of gaseous pollutants did not change significantly. When the sludge was mixed with lime, the emission concentration of SO2 decreased obviously, and gradually decreased with the increase of Ca/S molar ratio. When Ca/S exceeded 4, the effect of Ca/S molar ratio on emission reduction of SO2 became smaller. The addition of quick lime also reduced the emission concentration of NO, but with the increase of Ca/S molar ratio, the emission concentration of NO rebounded. © 2023 Chemical Industry Press. All rights reserved.
引用
收藏
页码：2170 / 2178
页数：8
相关论文
共 39 条
  • [1] China ecological environment status bulletin 2021(excerpt), Environmental Protection, 50, 12, pp. 61-74, (2022)
  • [2] Hou H M., Experimental study on incineration and emission characteristics of municipal sewage sludge in circulating fluidized bed, (2013)
  • [3] Werle S, Wilk R K., A review of methods for the thermal utilization of sewage sludge: the Polish perspective, Renewable Energy, 35, 9, pp. 1914-1919, (2010)
  • [4] Werther J, Ogada T., Sewage sludge combustion, Progress in Energy and Combustion Science, 25, 1, pp. 55-116, (1999)
  • [5] Vesilind A P, Ramsey T B., Effect of drying temperature on the fuel value of wastewater sludge, Waste Management & Research, 14, 2, pp. 189-196, (1996)
  • [6] Fu S C., Study on dry sludge incineration and pollutant discharge, (2019)
  • [7] Slim J, Wakefield R., The utilization of sewage-sludge in the manufacture of Clay Bricks, Water Sa, 17, 3, pp. 197-202, (1991)
  • [8] Chen R C., Process design and operation of hazardous waste sludge drying and incineration project in a chemical industry park, China Water & Wastewater, 33, 20, pp. 50-52, (2017)
  • [9] Murakami T, Suzuki Y, Nagasawa H, Et al., Combustion characteristics of sewage sludge in an incineration plant for energy recovery, Fuel Processing Technology, 90, 6, pp. 778-783, (2009)
  • [10] Yu W W., Demonstration and optimization study on desulfurization process of flue gas from sludge drying and incineration, Environmental Sanitation Engineering, 28, 3, pp. 38-43, (2020)
1234