70m? Design of heating coil in maleic anhydride storage tank
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①70m? Flat-bottomed cone-shaped storage tank, custom-made tank, with a required diameter of 4.5 meters. The design height is 4.4 meters, and the design temperature is 80°C; what should the design pressure be? (At normal pressure? ) ② Coils inside the storage tank; hot water at 90°C flows through these coils, while maleic anhydride at 80°C (initial temperature of 65°C) is present in the tank, with a flow rate of 30 m³/h. How is the hot water flow rate calculated? Take a pipe diameter of DN50 and a flow velocity of 0.7 m/s; the flow velocity of hot water is calculated based on the heat load, and it’s always impossible to match it with the pipe diameter and flow velocity.
1. All flat-bottomed conical-top storage tanks I have seen are at atmospheric pressure； 2. I won’t
In my case as well, the operating pressure is at atmospheric pressure, but a nitrogen seal and a vent valve are required; therefore, the design pressure is set around 0.1 MPa. Some sources suggest a pressure of 0.02 MPa, but the heating medium differs – they use steam, while I use hot water at 90°C