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Low SO2 emission from CFB co-firing MSW and bituminous
Qing-Gang Lu1, Zhi-Wei Li, Yong-Jie Na
1(Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100080, China. qglu@mail.etp.ac.cn
Journal of Environmental Sciences (China)
|November 24, 2004
Summary
Co-firing municipal solid waste (MSW) with high-sulfur bituminous coal significantly reduces sulfur dioxide (SO2) emissions. At co-firing rates above 51%, SO2 emissions dropped to zero in a circulating fluidized bed (CFB) furnace.
Area of Science:
- Environmental Science
- Chemical Engineering
- Combustion Science
Background:
- Municipal solid waste (MSW) co-firing with coal is a method for waste management and energy recovery.
- Bituminous coal with high sulfur content (1.79%) presents challenges for SO2 emission control.
- Circulating fluidized bed (CFB) combustion is a suitable technology for co-firing diverse fuels.
Purpose of the Study:
- To investigate the influence of the co-firing rate of MSW and high-sulfur bituminous coal on SO2 emissions.
- To determine the optimal co-firing conditions for minimizing SO2 emissions.
- To understand the mechanisms behind SO2 reduction during co-firing.
Main Methods:
- Experiments were conducted in a 0.15 MWt CFB at 1123 K.
- Varying co-firing rates of MSW and bituminous coal were tested.
- Measurements included particle concentration, alkali metal and sulfate concentrations in ash, and flue gas composition.
Main Results:
- Increasing MSW co-firing rate significantly decreased SO2 emissions.
- SO2 concentration in flue gas reached zero at MSW co-firing rates exceeding 51%.
- High particle concentration, alkali metals in bed material, and HCI in flue gas contributed to SO2 reduction.
Conclusions:
- Co-firing MSW with high-sulfur bituminous coal is an effective strategy for SO2 emission reduction.
- Optimal co-firing rates can achieve near-zero SO2 emissions.
- The presence of MSW alters combustion conditions favorably for SO2 capture.