High-pressure steam heater: steam flows through the shell side
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Currently, a project is underway to use high-pressure steam to heat exhaust gases. Due to the corrosive nature of these gases, users, in an effort to save costs, insist on using steam at 8.8 MpaG flowing through the shell side. Software simulations indicate that the BXU-type heat exchanger is superior; are there any high-pressure steam heaters of this type actually in use in practice?
Heat exchangers with fully counterflow shells were removed from GB151 version 99; they should no longer be used
Type X in BXU is not present in GB151
How high is the pipeline pressure? But with such high pressure in the shell side, if the pressure on the tube side is low, the tubes will be subjected to external pressure and their wall thickness will increase. As a result, the pipe is thick and so is its housing; the cost is also extremely high
Reply 2# letitbe: Is it clearly stated in GB151 that the X-shaped housing is to be discontinued? Could it be that it’s just not listed in the table in Figure 7! For a project some time ago, a BXU-type steam heater was also developed; at that time, the high-pressure steam was designed to flow through the tube side
This post was last edited and replied to by tjdxlifelover on 2011-6-30 22:24. Reply 4#: For penryn, the high-pressure steam pressure is 8.8 MpaG; however, 316L material is required for the process gas side. The user believes that it is more cost-effective to use steam in the shell side overall. In fact, this design is not reasonable, but the user has no choice but to go with it in order to save money. . .
Go through the shell side? Did you make a typing mistake? {:1_90:}
Reply to 7# penryn :$ Yes, it was a mistake; the user thinks that the steam should flow through the shell side
The BXU type heat exchanger is suitable for applications with high flow rates in the shell side and high requirements for pressure drop losses; it is indeed not appropriate for situations where high-pressure steam flows through the shell side. It is initially planned to use the BEM type. The equipment layout requires that this steam heater be vertical; does the orientation of the baffle plates, whether horizontal or vertical, have a significant impact? There is also a saying that the opening ratio of the baffle plates for steam condensation is generally set at 40% – what is the reason for this?