摘要
为了探究流化床锅炉低氧燃烧对炉内石灰脱硫过程的影响,在小型鼓泡流化床实验装置上开展了不同过量空气系数(0.6~1.2)下炉内石灰脱硫实验研究。通过炉内烟气组分变化特性、脱硫灰渣含硫量变化特性和脱硫石灰产物特性的研究,揭示了不同过量空气系数下炉内石灰脱硫特性。实验结果表明:当空气过量系数大于1.0时,含硫烟气主要是SO_(2),灰渣中的硫主要以硫酸盐形式存在,过量空气系数的降低对石灰固硫影响较小。当工况转变为缺氧燃烧时,烟气中的硫主要以H_2S形式存在,灰渣中的硫化物硫的含量最高,有机硫和硫酸盐硫次之,石灰中含硫产物大幅下降。从脱硫剂的利用率上考虑,建议低氧燃烧时空气过量系数宜控制1.0以上但尽可能低。
In order to explore the effect of low oxygen combustion on the desulfurization process of lime in the furnace in the fluidized bed boiler,the experimental study of lime desulfurization in the furnace under different excess air coefficient combustion conditions(0.6~1.2)was carried out on a small bubbling fluidized bed experimental device.Through the study of the change characteristics of flue gas components,sulfur content of desulfurization ash residue and desulfurization lime products,the desulfurization characteristics of lime in the furnace under different excess air coefficients were revealed.The experimental results show that when the air excess coefficient is greater than 1.0,the sulfur-containing flue gas is mainly SO_(2),and the sulfur in the ash slag mainly exists in the form of sulfate,and the reduction of the excess air coefficient has little effect on the sulfur fixation of lime.When the working condition is changed to hypoxic combustion,the sulfur in the flue gas mainly exists in the form of H2S,the sulfur content of sulfide in the ash residue is the highest,followed by organic sulfur and sulfate sulfur,and the sulfur-containing products in lime decrease significantly.From the perspective of the utilization rate of the desulfurizer,it is recommended that the air excess coefficient during low oxygen combustion can be as low as possible under the condition of controlling above 1.0.
作者
卢鑫耀
王勤辉
王波
程乐鸣
方梦祥
LU Xinyao;WANG Qinhui;WANG Bo;CHENG Leming;FANG Mengxiang(State Key Laboratory of Clean Energy Utilization,Zhejiang University,Hangzhou 310027,China)
出处
《能源工程》
2024年第2期37-43,共7页
Energy Engineering
基金
国家重点研发计划(2020YFB0606201)。
关键词
低氧燃烧
炉内石灰脱硫
过量空气系数
烟气特性
脱硫灰渣含硫量
hypoxic combustion
Lime desulfurization in the furnace
Excess air coefficient
flue gas characteristics
Sulfur content of desulfurization ash residue
