The issue of temperature drop in steam pipes
Thread Content
Our company plans to draw steam from a thermal power plant; the pipes will be of DN700 size, with a flow rate of 100 T per hour. The pipes will be installed overhead. I’m not sure about the temperature drop per kilometer; we plan to use a insulation layer with a thickness of 25 cm. If anyone knows anything about this, please feel free to give me some guidance.
I believe that the diameter should be determined using the calculation formulas in the power pipeline design manual to compute the pressure drop; for steam flowing within the pipes, an isentropic enthalpy drop process is assumed to determine the temperature drop. A humble opinion, added by the senior.
The last edit to this post was made by bfdlwolf on 2016-1-19 at 11:42. We should at least be told the steam temperature, steam pressure, the insulation material used and the thickness of the insulation layer, as well as the length of the steam pipes. Only with this information can we calculate the heat loss through the insulation layer; from that, we can determine the drop in steam temperature. In the best case, the steam temperature at the user’s end will be the saturation temperature corresponding to that pressure.
It depends a lot on the heating distance; it’s possible that DN600 can also be used for heating； Generally, it is estimated that there is a temperature drop of 5 to 10 degrees per kilometer ； Of course, specific calculations need to be carried out after determining the insulation structure based on the heat usage and heating conditions.