科研之友
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摘要
A Circulating Fluidized Bed Flue Gas Desulphurization (CFB-FGD) system was installed to clean up the flue gas from a 75 t/h boiler. The efficiency, and resistance lost of the FGD system are known to be relative to the concentration of the circulating particles. In order to study the effects of particle concentration on the FGD system, particle samplings were carried out at different sampling points in the scrubber tower, under different operational conditions. Then physical and chemical characters of collected particles were analyzed via X ray Diffractionmeter, IR spectrometer and scanning electron microscope. In addition, the microanalysis and composition analysis of the agglomerated particles and discrete particles were performed which helps to derive the mechanism of dry flue gas desulphurization process. The related study indicates that multi-layer slurry injection method has better performance than single-layer one in the absorber of FGD. In the recirculation box of FGD system, there is part of absorbent which is not fully reacted, and sulfur concentration in the cyclical ash increases with time increasing. That proves that recirculation of mass in the CFB-FGD system is necessary. The byproducts of desulfurization just adhere to the surface of solid particle matter, their structures are loose, and they will not densely cover on the surface of new absorbent as usual opinion. Particle matter agglomeration is serious in the absorber, and materials with moisture collide at random and stick together directly, but there is not the structure of annual ring on the profile surface of solid particles of CFB-FGD system.
- 出版日期2006
- 单位清华大学
