Steam pipeline pressure reduction issue
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I have a steam pipeline here that is about 400 meters long; it runs from the boiler and goes through two stages of pressure reduction – primary and secondary reduction. The pressure before these reductions is between 0.4 and 1.1 MPa. Due to the various departments that use steam along the pipeline, the pressure fluctuates as it isn’t constant. After the first stage of pressure reduction, the pressure can basically be maintained at 0.2 MPa, which is no problem. After the second stage of pressure reduction, the pressure can also remain around 0.02 MPa. To ensure a sufficient flow rate, diameter expansion is carried out during the pressure reduction process. By 0.02 MPa, the steam temperature is already quite low; there is a drain device before the steam enters the equipment. The problem is that our equipment requires two different gases to be introduced at various points; the pressure of the gas entering on one side is around 0.008 MPa, while the steam pressure on this side can only be reduced to between 0.015 and 0.02 MPa, which is higher than that on the other side. This imbalance when the gases are introduced causes issues as well, as the steam entering the equipment cools down and forms condensation water. I have consulted two feasible options, but the cost of each is about 100,000 too high. Do any experts have a way to solve this so that the cost can be around 50,000? The protagonist solves the problem as follows: 1. The steam supplied to the equipment should be at a pressure of around 0.008 MPa; it must be dry steam, with gas being supplied rather than water. The equipment has 15 containers, each with an air vent having a diameter of DN15. The flow rate during normal operation is around 3 cubic meters per hour, and this flow rate can be adjusted using the stop valve located ahead. 2. When steam enters the equipment and cools down, condensation water is formed – this is definitely a problem. Are there any good solutions or suggestions?
Steam pressure of 8 kPa, below 50°. At such a low temperature, why is steam still used for heating... and is heat transfer through the partition direct? It is recommended to consider other heat exchange methods. The specific operating conditions are unclear; no further suggestions are available
:Lol, I’m wondering too: you use desalinated water/steam condensate to exchange heat with steam. Can’t you just use water for heating? Or does steam need to enter the equipment to participate in the reaction? ;P
The purity of the steam must be very high; it can only be water vapor, with no other gases allowed. The main function of the steam is to regulate the particle size. Only steam can get in; if there’s water, then it’s useless. When water falls directly onto the powder, it doesn’t help to regulate the particle size
The purity of the steam must be very high; it can only be water vapor, with no other gases allowed. The main function of the steam is to regulate the particle size. Only steam can get in; if there’s water, then it’s useless. If water falls directly onto the powder, it doesn’t help to adjust the particle size; instead, lumps are formed. :)
Dear, I’m referring to gauge pressure; even at 8 KPa of gauge pressure, the steam temperature remains at 100 degrees. This steam is used to adjust the particle size, not for heating. So it’s not possible to use other heat exchange methods.
Is 100 degrees also called steam? Why not consider using clean air? By preheating the clean air before sending it in to adjust the particles, are all problems solved?
Clean air? Hey, I need the purity of this water vapor to be very high; hydrogen gas is fed in on the other side. I think that makes it clear – if oxygen gets in, it’s not good. :lol
Add a heat exchanger at the end where the steam enters the equipment; the steam at 0.008 MPa exchanges heat with the steam that has not yet been depressurized, thereby superheating the steam at 0.008 MPa.
Before feeding the equipment, drain the water first and then supply heat; if it gets too hot, there will be no water left
You didn’t say that from the start either! Hehe