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Effect of operating parameters and reactor structure on moderate temperature dry desulfurization
Jie Zhang1, Changfu You, Haiying Qi
1Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Thermal Engineering, Tsinghua University, Beijing 100084, China.
Environmental Science & Technology
|July 22, 2006
Summary
Dry desulfurization in a circulating fluidized bed flue gas desulfurization (CFB-FGD) system is most effective above 600°C. Optimizing particle residence time and gas-solid contact is key for high desulfurization efficiency.
Area of Science:
- Environmental Engineering
- Chemical Engineering
- Combustion Science
Background:
- Flue gas desulfurization is critical for reducing sulfur dioxide emissions.
- Circulating fluidized bed (CFB) technology offers potential for efficient dry desulfurization.
- Optimizing operating parameters and system components is essential for maximizing desulfurization performance.
Purpose of the Study:
- To investigate a moderate temperature dry desulfurization process in a pilot-scale CFB-FGD system.
- To evaluate the impact of operating parameters (temperature, CO2, solids concentration) on desulfurization efficiency.
- To assess structural improvements in cyclone separators and distributors for enhanced performance.
Main Methods:
- Conducted experiments in a pilot-scale circulating fluidized bed flue gas desulfurization facility.
- Varied operating parameters including bed temperature, CO2 concentration, and solids concentration.
- Implemented and tested structural modifications to the cyclone separator and distributor.
Main Results:
- Desulfurization efficiency significantly increased above 600°C due to improved gas diffusion and reaction equilibrium.
- Higher solids concentration and longer particle residence time enhanced desulfurization ratios.
- A two-stage cyclone separator and improved solids distribution positively impacted efficiency.
Conclusions:
- Moderate temperature dry desulfurization in CFB-FGD systems is feasible and effective above 600°C.
- Particle residence time and gas-solid contact are critical factors for high desulfurization efficiency.
- System component design, particularly cyclone separators and distributors, plays a vital role in optimizing performance.
