A pool is installed in the liquid ammonia storage area to absorb ammonia gas
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As the title indicates, ammonia gas released by the safety valves is to be absorbed in accordance with occupational health requirements; so how should the size of the tank be determined? What I was thinking was to calculate the amount of water based on the solubility of the ammonia discharged through the safety valve’s release flow, but the question is: what duration should be used for determining the safety valve’s discharge time?
I don’t remember exactly how the calculation is done. We have 2 ammonia tanks with a capacity of 50 cubic meters each, and the size of the liquid ammonia neutralization tank is 10×3×4 (L×W×H). The tank is also equipped with manholes and ports for adding chemicals. . . . .
I’m very curious about this issue – we’ve been having a lot of trouble figuring out what happens to the gas released by the safety valves of our two 2,000-ton liquid ammonia storage tanks! Hehe
Could you recall the calculation process again? We have two liquid ammonia tanks, each with a capacity of 200 cubic meters – we can’t just take pictures casually, right?
At room temperature, which is 25 degrees Celsius, the density of liquid ammonia is 0.602824 kg/L. According to Article 6.3.9 of the Code for Fire Protection Design of Petrochemical Enterprises, the storage coefficient for liquid ammonia tanks shall not be greater than 0.9. The filling coefficient is taken as a maximum of 0.9. Maximum storage capacity: 50×2×0.9×0.602824 = 54.25 tons. The size of the liquid ammonia neutralization tank is 10×3×4 (L×W×H), with a volume of 120 cubic meters; assuming 20% ammonia solution, the maximum amount of ammonia that can be absorbed is 24 tons. 24/54.25 = 0.44, which seems to indicate a safe level, so it can be used as an accident containment tank
Is ammonia directly introduced into the accident pool? Could things like gasping occur? What other issues need to be considered in the design?~
The ammonia gas is released directly into the tank, and I think there’s a high chance of backflow occurring. In more serious cases, backflow into the tank can create a vacuum that may cause the tank to collapse. Of course, it’s all based on assumptions; it’s not known whether such cases have actually occurred.
These are the regulations for storage tanks. Are there any regulations regarding tanks as well? For example, regarding the absorption level of 20% you mentioned, are there any specific rules? I don’t think 5.5.10 specifies it either. Are there no specific regulatory provisions in this regard? Also, what does your 0.44 mean?
At room temperature, the maximum concentration of ammonia solution is generally only 20%, which is determined by its physical properties. 0.44 is intended to indicate the proportion of ammonia that can be processed by the neutralization tank, relative to the total storage capacity of liquid ammonia.
Where can I find the basis for the design of a neutralization tank?
The vent pipe of our ammonia tank is connected to a water seal tank; once one of the ammonia tanks deflated, it now vents directly.