空预器中硫酸氢铵形成特性及其对颗粒物排放的影响  

Formation of Ammonium Bisulfate in Air Preheater and its Effect on Particle Emission

作　　者：骆律源 程滕 杨林军[1] 袁竹林[1] 范红梅[1] LUO Lü-yuan;CHENG Teng;YANG Lin-jun;YUAN Zhu-lin;FAN Hong-mei(Key Laboratory for Energy Thermal Conversion and Control of Ministry of Education,Southeast University,Nanjing 210096,China)

机构地区：[1]东南大学能源热转换及其过程测控教育部重点试验室,江苏南京210096

出　　处：《高校化学工程学报》2018年第3期675-682,共8页Journal of Chemical Engineering of Chinese Universities

基　　金：国家自然科学基金(51576039)

摘　　要：NH_4HSO_4生成是造成空预器堵塞的主要原因之一,其生成特性与逃逸氨及烟气中SO_3浓度有着直接关联。研究利用空预器模拟试验平台,探讨了NH_4HSO_4形成温度及其与烟气中NH_3、SO_3浓度的关系,并对空预器出口颗粒物物性进行了测试分析。结果表明:NH_4HSO_4形成温度在235~260℃,并与NH_3、SO_3浓度乘积的对数值呈正相关函数关系。因NH_4HSO_4生成而产生的颗粒物主要为粒径小于0.2μm的亚微米级颗粒。由于空预器中的逃逸氨浓度通常低于SO_3的浓度,因此空预器出口颗粒物的数量浓度及粒径分布与NH_3浓度存在明显正相关关系,提高NH_3浓度会明显增加NH_4HSO_4的生成量,使空预器出口处粒径小于0.1μm的颗粒物数量浓度升高,相比之下,增加SO_3浓度对颗粒物数量浓度的影响较小,但会使颗粒物粒径出现小幅度增大。Formation of ammonium bisulfate in air preheater is an important clogging factor, and the formation process is directly related to NH_3 and SO3 concentrations. A model device was used to explore the formation temperature of ammonium sulfate and its relationship with NH3 and SO3 concentrations, and particles from the outlet was analyzed. The results show that the formation temperature is in the range of 235~260℃, and it has a positive correlation with the logarithm of the product of NH3 and SO3 concentrations. Particles generated due to the formation of NH_4HSO_4 are mainly submicron particles 0.2 μm. Ammonia concentration in air preheater is usually lower than the concentration of SO3. Therefore, particle concentration is related to NH3 concentration at the outlet of the air preheater. Increasing NH3 concentration can increase NH4HSO4 formation and particle concentration（ 〈0.1 μm） at the outlet of air preheater. Meanwhile, increasing SO3 concentration has few effects on the concentration of particles, but slightly increases particle size.

关 键 词：空预器 硫酸氢铵 颗粒物 氨逃逸 形成温度 

分 类 号：X51[环境科学与工程—环境工程]