Heat exchanger
Thread Content
The two condensers in the tower system design were originally connected in parallel; it seems that the heat exchange efficiency was not good. Would it be better to connect them in series?
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The pressure of the condenser at the top of the tower is relevant to the energy efficiency and yield of the entire tower. The lower the pressure drop, the better; it is recommended to use ones with baffle rods! Most petrochemical enterprises across the country use parallel connection. The key is to calculate well and choose the right model.
According to the poster’s description, the original design for the condenser at the top of the tower was based on a configuration with two units connected in parallel; it was also mentioned that the heat exchange efficiency was poor (since no specific details were given, it can be assumed that the recovery rate of the material through condensation was not high). The poster now hopes to arrange the two existing condensers in series in order to achieve a higher recovery rate of the material. If that is the case, it simply indicates that the design of the current two condensers does not match the actual operating conditions. If it’s not a problem with the design parameters, then it must be an issue with the company that designed the condensers. The source of failing to meet requirements is the design. Furthermore, tower top condensers generally do not operate in a one-active-one-redundant configuration; therefore, with the current design where two units are connected in parallel, the material flows into the condenser in two separate streams. Thus, when using two units in series, there is insufficient area for the material flow, and it’s not possible to simply place one of the units behind the other. It is recommended to provide the vaporization rate values at the outlets of these two parallel condensers to the designers, and then add an additional after-cooler as a supplement. Or simply give up the current two non-compliant heat exchangers and redesign and manufacture one or two condensers that meet the requirements. You can also send me the design parameters, and I’ll provide you with a proposal for an inward-folding fin condenser for comparison.
Indeed, it is because the production capacity has been increased, which in turn leads to the condenser no longer being able to meet the current demands
It is recommended to conduct a verification using the parameters obtained after increasing the load, taking into account not only the flow rate, pressure drop, and energy consumption, but also parameters such as thermal balance on the hot and cold sides as well as the solvent recovery rate. If the increase in production capacity is significant, it is recommended to replace the condensers; simply installing an after-cooler at the back of these two parallel condensers may not yield good results.