MENG Chun-lin,YAN Ying-ying,LIANG Yuan,et al.Thinking and Suggestion on the Control Index of Sludge Co-incineration in Thermal Power Plant[J].China Water & Wastewater,2021,37(14 14):46-55.
Thinking and Suggestion on the Control Index of Sludge Co-incineration in Thermal Power Plant
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第37卷
Number:
14 14
Page:
46-55
Column:
Date of publication:
2021-07-17
- Keywords:
- thermal power plant; sludge co-incineration in thermal power plant; sludge quality; sludge disposal
- Abstract:
- In recent years, projects using thermal power plants for incineration of sludge have gradually increased, and sludge co-incineration in thermal power plants has already become an important domestic sludge disposal method. However, sludge co-incineration in thermal power plants has not yet been regulated by corresponding specifications. To promote the sustainable and standardized development of the industry, it is necessary to systematically consider the key control indicators such as sludge quality requirements, blending ratio, and possible secondary pollution of sludge co-incineration in thermal power plants. Regarding the pollutant index of the sludge entering the boiler, it is recommended that the requirements can be referred to the standards of Quality of Sludge from Municipal Wastewater Treatment Plant (GB 24188-2009). The limit for total mercury should be strict and meet the requirement of total mercury（<15 mg/kg dry solid）due to its toxicity and volatility. Regarding the water content and blending ratio for sludge, it is suggested that the sludge co-incineration in the pulverized coal boiler should be dry sludge. When the sludge water content is ≤40% and the blending ratio is ≤5%, it has few effects on the operation of the boiler and the discharge of pollutants. Dewatered sludge can be co-incineration in the fluidized bed boiler. When the sludge water content is ≤80% and the blending ratio is ≤10%, it has few effects on the operation of the boiler and the discharge of pollutants. Regarding gas emission standards, it is necessary to comprehensively evaluate the risk of air pollutant emission from the sludge co-incineration in thermal power plants, and to synthetically consider the requirements of Emission Standard of Air Pollutants for Thermal Power Plants (GB 13223-2011), Standard for Pollution Control on the Municipal Solid Waste Incineration (GB 18485-2014), EU 2000/76/EC, and Emission Standards for Odor Pollutants(GB 14554-2018). In addition, the sludge coincineration in the thermal power plant should not affect the original disposal or comprehensive utilization path of the slag and fly ash in thermal power plant. In principle, the fly ash produced should be identified in accordance with the Identification Standards for Hazardous Waste—General Rules（GB 5085.7-2019）. If it is not hazardous, it can be treated and comprehensively used in the original way. Otherwise, it should be disposed according to the hazardous waste treatment and disposal regulations.
Last Update:
2021-07-19