What are the solutions to the heat release issue during the preparation of ammonia solution?
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Question: When preparing ammonia solution using softened water and liquid ammonia, heat is released. What measures or strategies are employed in engineering design to address this issue? Thank you!
Control the mixing speed and allow natural cooling. Or multi-stage mixing.
Thank you! Once it’s prepared and put into the tank, isn’t it necessary to install a spray system inside the tank? To prevent ammonia from evaporating at higher temperatures...
Remove heat in a timely manner; isothermal absorption is the preferred method. For industrial use, volatilization will certainly occur as the temperature rises; if the amount used is small, it is best to use a pressure vessel for storage under pressure at room temperature.
It is absorbed in the spray tower and then sent to the pressure storage tank
Small-scale ammonia water production units can be constructed using reactors equipped with jackets or internal coils; for slightly larger scales, venturi mixers can be employed, with a cooler installed after the venturi. For large-scale production, ammonia absorption towers are used, and packed towers are generally suitable for countercurrent absorption. The absorption liquid is pumped out by an external circulation pump and passed through an external circulation cooler; part of this liquid is used as the ammonia water output, while the rest is returned to the upper section of the packed tower as circulating spray liquid. Pressured absorption is preferred to prevent the volatilization of ammonia. The heat of reaction is removed through a cooler; ordinary circulating water is sufficient for this purpose. If higher standards are required, in order to prevent the release of large amounts of ammonia, low-temperature water can be used for absorption, with pressurized water being the best option for this purpose.