Why are the stripping gas temperatures at the bottom of the stripper and the fractionator different? They all come from F501 (the feed heater for the fractionation tower).
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The situation on site is as follows: the thermocouple for measuring the blowing temperature of C502 is located in front of the flow control valve, while the thermocouple for measuring the blowing temperature of C501 is located behind the valve. On the DCS display in the control room, the blowing temperature of C502 is 340 ℃, which is about 16 ℃ higher than 324 ℃ for C501. Why is this?
Reply to Floor 2: Why does the temperature drop after blood pressure is reduced?
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Cooling through throttled expansion, just like your home air conditioner
Is that so? This is superheated steam; it’s present both before and after the valve
The cross-sectional area at the control valve is small; after passing through the control valve, the cross-sectional area increases suddenly, causing the volume of steam to increase, and as a result the temperature drops. This is similar to the principle behind the expansion at the outlet of a pressure reduction furnace.
You can check whether the flow rates of the two steam blowers are the same On the one hand, when the flow rate is too low, heat loss is significant, and the temperature upon reaching the base of the tower becomes too low ； However, if the steam flow rate is too high while the thermal load of the furnace remains relatively constant, it will result in too low a steam temperature.
I’m a bit confused; I don’t understand. I just look at whether there’s a difference in heat flow and heat retention, and whether the temperature difference can be explained by the amount of heat dissipation
It can be considered that they are all the same – all superheated steam
Is the thermocouple accurate? Are the two thermocouples the same shape? It is also related to the installation of thermocouples. Measurements may vary depending on the depth of the thermocouple.