Do steam heaters (finned tubes) used for flue gas heating fall under the category of pressure vessels or special equipment?
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A steam heater made of finned tubes is used to heat the flue gas; steam flows inside the finned tubes (with a pressure of 2.5 or 1.1 MPa), while the flue gas flows outside the tubes (in the shell side), under a positive pressure of 1000–3000 Pa. Do the aforementioned steam heaters fall under the category of pressure vessels or special equipment? Note: The heated steam goes directly
Note: The steam after heating is discharged directly through the steam trap
Check the equipment’s factory data and design documents
It should fall under the NB/T 47049-2016 standard for tubular air preheaters, and shall be manufactured in accordance with the requirements of GB150
What you’re doing can be considered a preheating stage; is it sufficient to heat the flue gas by twenty or thirty degrees Celsius? This does not fall under the category of pressure vessels; it is not a tank-type device, and it only requires a properly designed pressure-bearing component
The steam pressure is high; finned tube heat exchangers have pressure ratings, so they should be considered within the category of pressure vessels. The steam pressure is very high, with a temperature of over 190 degrees. Discharging it using a steam trap would result in significant waste; energy savings are definitely possible. How many layers does your heat exchanger have? It is possible to use steam at different pressures at various levels to save energy, which can result in significant cost savings over the course of a year. It also depends on how much steam is used by your heat exchanger.