Evaporation calculation
Thread Content
This post was last edited by pzhhuagong on 2017-1-2 08:01 In the calculation of the double-effect evaporation process, countercurrent and the second effect use a vacuum of -80Kpa. What I want to ask is: how is the heat in the second effect calculated? Specifically, how is the heat of the secondary steam calculated? Liquid: Inlet efficiency: 32%, temperature: 80°C, flow rate: 14.93 m³/h, specific heat: 3.617 kJ/kg·°C. Outlet efficiency: 38%, temperature: 75°C, flow rate: 11.98 m³/h, specific heat: 3.536 kJ/kg·°C. Secondary gas: Flow rate: 3096.61 kg/h, 37360.45 m³/h; temperature: 75.4°C; pressure: 0.0133 MPa. Do not spray it; please describe the reasoning behind this. Thank you
Based on a preliminary simulation using your data, with a pressure of 0.0133 MPa, the calculated temperature is 73.7°C; this is only 1.3°C off from your value of 75°C. The flow rate is 11.931, showing a difference of just 0.05, which indicates a relatively small error. The calculated power consumption for the second-effect evaporation process is 2041 kW
If you can provide more data, I can perform simulation calculations for the entire two-effect countercurrent evaporation process