摘要
JCF换热器利用promoter(促进高效的管内结构)减薄气膜厚度,并控制沿气流方向气膜的增厚,使传热系数高达115W/(m^2·K)。而采用碟环挡板的管壳式换热器,在相同的传热温差(△t_m=45℃)下,传热系数仅为25W/(m^2·K)。用JCF换热器改进或改造(结合沸腾转化)固定层转化烟气制酸装置,预计可收到良好的技术经济效果。对于SO_2浓度>3％的装置,可维持自热固定层转化,对于SO_2浓度<3％的装置,有可能实现两级一次沸腾转化。文中列举了4套装置的改进(改造)方案。
A heat transfer coefficient of as high as 115W/(m2·K) is reached in case of JCF heat exchanger by using a promoter to reduce and control the thickness of gas film along flow passage, while the conventional shell-and-tube heat exchanger with disk-doughnut baffles has only a heat transfer coefficient of 25W/(m2· K) at the same temperature difference. The gas containing > 3% SO2 can be processed autothermally in fixed-bed converters and a two-stages single flu-idized bed conversion process can be adopted for the gas containing <3% SO2 when JCF heat exchangers are used. 4 improvement or reformation (combined with fluidized bed conversion) cases are discussed.
出处
《硫酸工业》
CAS
1993年第3期42-47,60,共6页
Sulphuric Acid Industry
