Function of the vent pipes (vent holes) on the primary cooler
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As the title suggests, what is the function of the vent pipes (vent holes) on the primary cooler, and when should they be opened? I’d like to ask the experts here, thank you.
1. The dispersion pipe of the Ontology is used during replacement； 2. The drain pipe for circulating water is always open and used for venting.
It is also turned on during the steam purging of the body vent pipe
The vent pipe of the primary cooler itself: it is opened first when the primary cooler is replaced； The second is to be opened during purging in order to overcome high resistance ； Third, when the primary cooler is in standby or under maintenance, some manufacturers keep it open while others leave it closed ； In any case, the key is to carry out operations while ensuring the safety of the gas system! Remember!
I have a question for the person in floor 2: why must the drain pipe for circulating water remain open at all times? Won’t it allow air to enter?
After heat exchange with gas, the temperature of the circulating water rises, and the vapor pressure of water at the water’s surface increases; in other words, water vapor is generated. This vapor must be removed from the top of the circulating water pipes, otherwise it will return to the cooling tower along with the water. This can cause the covers of the water distribution channels in the cooling tower to be blown off, resulting in a lot of water splashing out.
Is there a vent on the water side of the vertical tube type primary cooler?
Are you referring to the release of gas from the initial cooling stage? Or is it the discharge of circulating water?
The vent pipe of the primary cooler is opened during replacement and purging. The vent pipe for circulating water remains open at all times and is used for exhaust. It’s also used for draining water during maintenance.
Generally, combustible gases are discharged through dispersion pipes, which are used to expel and disperse the gases. It is required that these pipes extend outside the building so that the gases can disperse rapidly, thereby preventing explosions or deflagrations； When venting, these factors are not taken into account; the gas can be directly released into the atmosphere (such as steam vented from power plants).
Ensure equal pressure inside and outside the container when replacing the gas
The water-side vent of the vertical pipe primary cooler in our plant is an open manhole that cannot be covered.
The vent pipe is opened during gas replacement; otherwise, it remains closed most of the time, as the primary cooling air is generally under negative pressure.
The vent pipe of the primary cooler itself: (1) Opened during replacement when the primary cooler is shut down or brought online； (2) Initially, the cooler had high resistance, so during purging it was necessary to open the vent pipe to discharge the gas being replaced ； (3) The backup primary cooler can have its inlet and outlet valves closed while the vent pipe is opened; it can be put back into use after being refilled ； Of course, it is also possible to close the vent pipe and slightly open the gas outlet or inlet valve to maintain pressure with gas.
The main function of the circulating water discharge pipe is to vent air; this is because the temperature of the circulating water rises after heat exchange with gas, resulting in evaporation or vaporization, that is, the formation of water vapor. If this gas is not released, water vapor will return to the cooling tower through the pipes, which may cause the covers of the water distribution channels in the cooling tower to be blown off, leading to a large amount of water splashing out; in severe cases, accidents can occur.
The body of the cooler is used for venting during replacement, maintenance, and steam purging; the exhaust pipe is part of the circulating water circuit
The aqueous phase discharge pipe also serves to prevent the primary cooler from overpressuring.