摘要
在一台75t/h循环流化床烟气脱硫装置上,对不同工况下、脱硫系统不同位置采集的大量灰样,利用X衍射仪、扫描电镜、能谱仪、颗粒粒径分析仪等仪器进行较为详细的物理化学特性分析。通过灰样分析了解它们的形成机理,进一步揭示干法烟气脱硫的机理和固体颗粒物的循环特性。研究表明,脱硫塔内采用多层喷浆方式优于单层喷浆方式,脱硫装置的回料箱内含有未反应完全的脱硫剂Ca(OH)2,同时循环灰含硫量随着时间的增加而增加,证明了CFB-FGD物料循环的必要性。脱硫产物层只是附着在固体颗粒物的局部,结构疏松,而不是通常所说的密实的覆盖在新鲜脱硫剂的表面。脱硫塔内团聚现象严重,含湿颗粒随机碰撞后直接粘在一起,在DCFBS中脱硫固体颗粒物剖面不存在年轮状结构。
A Circulating Fluidized Bed Flue Gas Desulphurization （CFB-FGD） system was installed to clean up the flue gas from a 75t/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 mcreasing. That proves that recrculatlon of mass in the CFB-FGD system is necessary. The byproducts of desulfurizatlon just adhere to the surface of solid particle matter, their structures are loose, and they will nol densely cover on the surface of new absorbent as usual opinion. Particle matter agglomeration is serious in the absorber, and materials with moisture colhde at random and stick together directly, but there is not the structure ot annual nng on the profile surface of sohd parucles of CFB-FGD system.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2006年第1期70-76,共7页
Proceedings of the CSEE
