Seeking advice on overheated steam pipeline issues
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There is an existing superheated steam pipeline, with a temperature of 320°C and a pressure of 1.1 MPa at point A. At point B, the temperature is 290°C and the pressure is 0.8 MPa. Help: 1. What factors are related to the pressure loss between points A and B? 2. Is there a difference in the steam flow velocity between points A and B in such a pipe? I need expert advice!
The temperature change at the two points is caused by the heat loss along the flow path, while the pressure change is caused by the pressure drop along the flow path. For the calculation of variable fluid resistance drops, it is best to use a segmented iterative approach.
Given a constant pipe diameter, does a higher flow rate in the pipe result in a greater pressure drop between the two points?
Yes. If the two points are fixed, the greater the flow rate, the greater the pressure drop. At the same time, the greater the pressure drop, the higher the volumetric flow rate, which in turn causes an even greater pressure drop.
Refer to \"HG-T 20570.7-95 Calculation of Pipe Pressure Drop\": when the pipe diameter remains constant, the pressure difference between two points is related to the starting pressure and flow rate. When the starting pressure is high and the flow rate remains constant, the pressure difference decreases. When the starting pressure remains constant, the flow rate increases and the pressure difference grows (non-linearly). To increase the pressure at point B, there are two ways: increase the pressure at point A or enlarge the pipe diameter. With the latter, the calculation requires the pressure and temperature of the steam (specific volume), flow rate, pipe diameter, and pipe length.