Ask for help: Valve in front of flash tank
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Ask the experts: Some data indicate that the valve in front of the flash tank is the real flash evaporator. The flash tank only provides space for vapor and liquid separation. Is this correct? Is the valve in front of the flash tank a special pressure reducing valve or a general manual valve? What role does the valve opening play in flash evaporation? Don’t hesitate to teach me
Personally, that's not the case. For example, in the flash evaporation of condensate water, as the condensate water is introduced, the pressure in the flash tank gradually increases. When the pressure reaches the set pressure, the outlet valve is opened. At this time, the steam at the required pressure can be flashed. At this time, the valve in front of the tank only needs to be an ordinary gate valve.
Theoretically, the pressure in front of the flash tank and behind the valve is consistent with the pressure in the flash tank, and the real flash should start from behind the valve. The opening of the valve is different, the local resistance drop is different, and the effect on flash evaporation is naturally different. As for what kind of valve to use, it must be determined according to the actual process requirements.
Flash evaporation is when high-pressure saturated water enters a relatively low-pressure container and due to the sudden decrease in pressure, the saturated water becomes part of the saturated water vapor and saturated water under the pressure of the container. The regulating valve in front of the flash tank plays a role in throttling and reducing pressure. The flash tank only provides space for separation of vapor and liquid, so the information given by the poster is correct. The regulating valve is a general regulating valve. The opening size determines the pressure difference between the front and rear sections of the regulating valve, which determines the amount of flash evaporation.
Through your interpretation, I understand some principles of flash control, thank you.