Steam consumption per day for carbon dioxide hydrolysis heater
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Operating temperature: Shell side – inlet 150, outlet 100; Tube side – inlet 35, outlet 100. Operating pressure (MPa): Shell side 0.5, tube side 1.3. Tube diameter: Φ25*2.5, length L=300, number of tubes n=374. Dimensions: Φ700*8, height H=4470. Heat transfer area: 80 m2. In practice, steam at 0.7 MPa is fed to the shell side, with automatic control via a throttle valve based on carbon dioxide levels. Inlet temperature on the tube side is 35 degrees, and the outlet temperature is 80 degrees. The medium on the tube side is carbon dioxide. The carbon dioxide flow rate is 12,000 cubic meters per hour. Find out how many tons of steam are used per day. There is also a technical issue: whether it is feasible to use 100-degree process condensate instead of steam to heat carbon dioxide, in the absence of steam heating. How much condensate is used?
The heat of condensate cannot be compared to that of steam. One is sensible heat and the other is latent heat.
It’s easy to talk about it, but difficult to do the calculations manually. With software, just a few clicks can give a rough estimate, but it’s hard to determine the actual difference. The data provided by someone who has specialized in steam heating design and has practical experience in field applications holds greater value. As mentioned above, when using hot water, there is less phase change heat transfer, and the heat transfer coefficient also decreases; under the condition of limited increase in flow rate, it is basically insufficient to meet the requirements
Thank you. I was wondering if there are any specialized calculation software available
First, you need to calculate the heat required to raise carbon dioxide by 45 degrees, then determine the heat required for steam; heat losses and heat transfer efficiency also need to be taken into account. It’s best to have professional designers carry out these calculations
The difference between sensible heat and latent heat during the heating process is quite noticeable. First, you need to calculate the required amount of heat (I’m sure you’re able to do this calculation), and only then can you determine whether condensate can be used for heating. At the same time, heat transfer efficiency and heat loss are also taken into consideration; furthermore, if the condensate is available in sufficient quantity, then it simply results in higher consumption and longer heating times.