On LNG heat exchange calculations
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This post was last edited by a250022517 on 2021-7-23 18:05. Dear experts, I have a basic question to ask. To vaporize 2400 kg/h of LNG at -160°C into natural gas at 45°C (with the entire process taking place at a pressure of 1.0 MPa), how many kW of heat is required? Koreans calculated using HYSYS and got a result of only 453 kW. In contrast, my calculations based on sensible heat and latent heat yielded a value of over 1,700 kW
-From 160°C to vaporization, and then from the gas state to 45°C, the specific heat varies in between. Therefore, it must be divided into multiple segments; for each segment, the heat quantity is calculated based on its average specific heat, and the latent heat is then added.
The latent heat of vaporization of LNG (pure methane) is 122 Kcal/kg. The latent heat of vaporization of LNG also depends on its composition; it is a function of the liquid temperature as well. The higher the temperature, the lower the latent heat of vaporization.