The issue of recovering the heat from dehydrogenation reactions
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The dehydrogenation reaction is an exothermic reaction; under normal conditions, the CO2 feed gas experiences a temperature increase of around 50°C after passing through the dehydrogenation reactor. The higher the hydrogen content contained in it, the greater the temperature rise. Currently, most manufacturers use cooling water to remove this heat, resulting in the energy going unreused. It is recommended to install a heat exchanger after the dehydrogenation reactor; this allows the reaction heat to be recovered using the untreated CO2 as a coolant before it enters the CO2 heater. This approach not only saves steam consumption but also recovers the reaction heat. What do everyone think of this idea? Let’s discuss this together; feel free to share your insights for everyone to benefit from.
Our plant’s dehydrogenation unit uses this method to recover thermal energy. However, it has not been put into use yet, so it is still impossible to determine its effectiveness.
It’s a good idea, but additional equipment would be needed; I’m not sure if there’s enough space to install it. The original steam heat exchanger can’t be removed, right... Last edited by sister on 2009-3-14 20:13]
Adding a heat exchanger at the outlet of the dehydrogenation reactor will increase costs, but it can reduce the steam consumption of the existing CO2 heater; in the long run, this should be cost-effective. The original steam heat exchanger (i.e., the CO2 heater) definitely cannot be removed! However, if a new dehydrogenation unit is installed, the heat exchange area can be appropriately reduced, allowing the equipment to be smaller. As for the installation location, it depends on the specific circumstances.