Diulf
Chemical
- Sep 26, 2024
- 1
Hi,
I was told that pressure in closed condensate tank depends on condensate temperature because pressure in the tank will be same as saturation pressure due to flashing... But I find this hard to understand.
For example,
A system which has a steam-to-water heat exchanger, closed condensate tank right below the heat exchanger and heating power of steam is controlled using condensate valve. Steam pressure is 3 bar(g) and pressure drop due the heat exchangers is 1,5 bar(g).
If heat exchanger sub cools condensate to 95°C, does this mean that pressure inside of the condensate tank is below 0 bar(g) because the saturation pressure will be under 0 bar(g) on that temperature. This assumption will lead to negative pressure in pump suction which doesn't make any sense.
What if temperature of condensate is 120°C. Does it flash in a tank or because condensate valve?
How I can determine the pressure inside of the condensate tank?
Please help me to understand this topic.
I was told that pressure in closed condensate tank depends on condensate temperature because pressure in the tank will be same as saturation pressure due to flashing... But I find this hard to understand.
For example,
A system which has a steam-to-water heat exchanger, closed condensate tank right below the heat exchanger and heating power of steam is controlled using condensate valve. Steam pressure is 3 bar(g) and pressure drop due the heat exchangers is 1,5 bar(g).
If heat exchanger sub cools condensate to 95°C, does this mean that pressure inside of the condensate tank is below 0 bar(g) because the saturation pressure will be under 0 bar(g) on that temperature. This assumption will lead to negative pressure in pump suction which doesn't make any sense.
What if temperature of condensate is 120°C. Does it flash in a tank or because condensate valve?
How I can determine the pressure inside of the condensate tank?
Please help me to understand this topic.
