Ammonia cooler in pre-cooling system
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Can any friend provide the relevant parameters of the ammonia cooler used in the air separation precooling system 1. The temperature and pressure of liquid ammonia. 2. The pressure and temperature of ammonia after evaporation. 3. Whether it is necessary to increase the pressure on the ammonia side during shutdown to prevent the water pipeline from freezing.
The liquid ammonia entering the ammonia cooler is 25°C and 1.6MPa(A), the return gas ammonia control pressure is 0.49 MPa(A), the temperature is 4°C, and the evaporation capacity under normal working conditions is 5.2T/h. Discharge liquid ammonia
1. Liquid ammonia at 10℃ and pressure 0.51MPa(G). 2. The control pressure of the returned gas ammonia after evaporation is 0.3 MPa (G) and the temperature is 1°C. 3. Liquid ammonia is drained when out of operation. I think it is OK to drain the water and increase the pressure without draining the liquid ammonia. The evaporation capacity under normal working conditions is 4.7T/h.
Let me talk about the ammonia cooler I used before. The liquid supply temperature is 20 degrees, and the pressure requirement is 1.8MPA. The evaporation pressure is 0.36MPA. The evaporation temperature is 2 degrees. After parking, we usually drain the water from the ammonia cooler instead of draining the ammonia, which is very troublesome.
Evaporation temperature ℃ corresponding pressure MPa (G) Evaporation temperature ℃ corresponding pressure MPa (G) 0 0.33 16 0.65 1 0.35 17 0.68 2 0.36 18 0.71 3 0.38 19 0.73 4 0.40 20 0.76 5 0.42 21 0.79 6 0.43 22 0.82 7 0.45 23 0.85 8 0.47 24 0.88 9 0.49 25 0.91 10 0.51 26 0.94 11 0.54 27 0.97 12 0.56 28 1.01 13 0.58 29 1.04 14 0.60 30 1.08 15 0.63 31 1.11 I don’t know if you want this parameter. I hope it can help you.
Reply to 5# gader An interlocking cut-off valve is installed on the gas ammonia evaporation pipeline. When the ammonia temperature is lower than 0 degrees (or the pressure is lower than 0.3MPa), the valve will automatically close. Prevents water side from freezing.