Are there any requirements for the inlet temperature of the high-pressure air cooling?
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Why?
Air cooling means there is no requirement for a cooling medium. However, regarding the ammonium salt content, there are requirements for the water injection volume
In some places, due to concerns over excessive crystal growth in the past, a minimum temperature for air cooling has been set. I don’t quite agree with this approach; it seems like there’s no real need for it.
Check the design temperature of your equipment. Additionally, an excessively high inlet temperature indicates that the heat exchange process prior to it is not proper, resulting in poor heat recovery efficiency
I don’t think it’s necessary; if the temperature is low later on, an inlet with a high temperature is sufficient as long as it’s below 60°C. If there’s a risk of ammonium salt crystallization, there’s continuous water injection at the front.
Agreed, I think the same as you – I want to see if there are any units that seem a bit redundant.
The high inlet temperature can be controlled; it’s to prevent crystallization, and the design is fine
The temperature should be maintained between 40-55; a lower temperature is beneficial for the equipment, while a higher temperature is advantageous for reducing energy consumption
Oh, you mean the temperature after air cooling? I agree with that.
The inlet temperature should not be too low; taking into account the crystallization temperature of ammonium salts, the temperature at the top of the heat exchanger generally should not exceed 230℃
The design specifies a maximum of 50 degrees, but it’s usually not enforced that strictly
Yes, the material quality is definitely of primary importance; another consideration is preventing blockages caused by ammonium salts, and then there’s also the issue of limitations related to high temperatures
It is mainly limited by the high-temperature threshold; the high-temperature control is kept below 55 degrees, usually around 45
The inlet temperature for high-pressure air cooling ranges from 150 to 180 degrees. If it is too high, first, the heat recovery rate decreases; second, it increases the load on the air cooling system, which in turn places higher demands on the materials used for air cooling. Too low ammonium thiocyanate crystals.
There is no requirement for inlet temperature. It depends on your process requirements. It’s sufficient to control the outlet temperature.
There is a requirement that ammonium hydrogen sulfide begins to form crystals at around 130 degrees. If the temperature is too low, ammonium salts will precipitate. Since the inlet main pipe is large in diameter, the pressure and flow rate are high; however, when the fluid distributes itself across numerous air-cooled tube bundles, the pressure and flow rate decrease accordingly, which can easily lead to blockages in the tube bundles and disrupt normal production. Additionally, the precipitation of ammonium salts can cause corrosion beneath the scale
The inlet temperature must not be higher than the design temperature for air cooling