Features of formation and reduction of sulfur dioxide emissions when burning brown coal in boilers with liquid slag removal

The paper considers the influence of technological factors (design of the boiler-unit, load, air excess, the number of working dust collecting systems) on the formation and reduction of sulfur dioxide emissions in boilers with liquid slag removal. Understanding of this influence can be used both at...

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Bibliographic Details
Main Authors: Elsukov, Vladimir, Latushkina, Svetlana
Format: Conference Proceeding
Language:English
Subjects:
boiler load
Boilers
boilers with liquid slag removal
Burning
Calcium
Calcium sulfate
Combustion
Design factors
Dust
dust-forest systems
Emission measurements
Emissions
excess air
Lignite
pollutant emissions
Power sources
Reduction
Slag
Sulfates
Sulfur
Sulfur dioxide
thermodynamic modeling of combustion processes
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Summary:The paper considers the influence of technological factors (design of the boiler-unit, load, air excess, the number of working dust collecting systems) on the formation and reduction of sulfur dioxide emissions in boilers with liquid slag removal. Understanding of this influence can be used both at many operating heat and power sources, and in the development of new combustion technologies. The long-term experience of burning brown coals of the Kansk-Achinsk basin (KAC) at CHPP-6 in Bratsk in boilers of the BKZ-320-140 PT type is studied and analyzed. The analysis uses the results of various thermodynamic and industrial studies of the sulfur dioxide formation during the combustion of KAC, including those carried out by the authors. They identified the temperature and structural zones of the boiler unit, where the resulting reaction of the sulfur dioxide transition to calcium sulfate occurs. It was found that such a zone is the upper part of the cooling chamber, where the indicated transition occurs at temperatures of 1500 ÷ 1400 K. It was found that SO2 emissions rise with an increase in the boiler load and air excess. They also depend on the number of dust systems and their combination (determining the turbulization of combustion processes). A technological mechanism for the sulfur dioxide transition to calcium sulfate for the operation of boilers with liquid slag removal is proposed. Regime and constructive measures are proposed to reduce emissions of sulfur dioxide.
ISSN:2267-1242
2555-0403
2267-1242
DOI:10.1051/e3sconf/202020903012