English
Русский Improving the efficiency of steam condensation from combined-cycle gas mixtures in shell-and-tube condensers during CO₂ capture in cement plants
Abstract
The article discusses the processes of heat exchange during the condensation of vapors from combined-cycle gas mixtures containing a significant amount of non-condensing gases and solid impurities. The original design of a horizontal shell-and-tube condenser with profiled fins providing rupture and dispersion of the condensate film is presented. A quantitative assessment of the effectiveness of the proposed apparatus was carried out in relation to the conditions of a cement plant (capacity of 1.0 million tons of cement per year). It is shown that the introduction of oxygen combustion of fuel with subsequent condensation of water vapor makes it possible to reduce the volume of exhaust gases by 54.6%, increase the mass fraction of co₂ in the stream to 94.8% and reduce carbon dioxide emissions by 0.83 tons of co₂ per ton of cement produced. The optimal angle of inclination of the fins distribution strips is 5°, at which the degree of condensation reaches 95.1%, and the heat transfer coefficient is 260 W/(m2•K). The proposed design makes it possible to reduce the metal consumption of the condenser by 12-15% compared to smooth-tube analogues without increasing hydraulic resistance.