Heat exchanger fluid flow direction
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The non-condensable gases generated during the distillation of vinyl chloride are condensed into liquid monomer using barium chloride brine at around -25 degrees Celsius, and this liquid monomer is returned to the intermediate unit for further distillation. For vertical condensers, where non-condensable gases and brine enter at the bottom and exit at the top, with heat exchange in the same direction and the gases flowing through the tube side, what are the advantages and disadvantages of this design compared to counterflow heat exchange? A monomer production capacity of around 250,000 tons,
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Gases generally flow in during the summer and out during other times, as this reduces resistance. Moreover, counterflow is advantageous; it results in a higher heat transfer coefficient compared to co-flow. In the case of horizontal heat exchangers, the heat transfer coefficient under the same conditions is approximately 4.7 times that of vertical heat exchangers
The process materials contain water, so intermittent de-icing is required; the two cryocoolers are operated in alternating fashion. The vertical parallel-flow design is intended to facilitate such intermittent de-icing, with the melted ice water flowing back to the bottom and returning to the system.