Determination of Heat Flows in Built-in Column Reflux Exchangers During Diabatic Rectification

During diabatic rectification, the internal flows of the mixture being separated change along the column height due to heat exchangers placed on plates through which the heat carrier circulates. The authors of the article propose a scheme for implementing diabatic rectification with integrated coil reflux exchangers in a poppet column and present a mathematical description of the process of heat removal from them during condensation of ascending vapors of ethyl alcohol-water mixture under separation on the coil pipes. The thermal power of the built-in reflux exchanger is determined by considering the influence of thermophysical properties and the location of the coils. An increase in the coolant's temperature at the outlet of the coil deflector leads to a decrease in thermal power. All other conditions being equal, the largest amount of thermal power falls on the lower plates of the column. The values of the average heat transfer coefficient during condensation of liquid vapors increase with an increase in the coolant's temperature (water) at the outlet of the reflux exchanger, however, the linear heat transfer coefficient decreases. To increase the thermal capacity of the reflux exchangers (and, consequently, the efficiency of separation of liquid mixtures) it is advisable to use various methods of intensifying heat exchange from the outside of the pipes.,