It features a stirred slurry bed reactor with steam heating coils inside; how to cool it down when the system is shut down?
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It features a stirred slurry bed reactor with steam heating coils inside; how to cool it down when the system is shut down? The temperature inside the reactor is 320°C. Can steam be replaced directly with water to lower the temperature? Will the water vaporize immediately and damage the equipment? The natural cooling period is simply too long; I tried it out and it took about five days to reach 90 degrees Celsius. As a result, some of the insulation was removed, since the temperature required for hydrogen is also 100°C, whereas the catalyst needs to be at below 50°C in order to be removed. I’m looking for a better solution
Cooling water coils are installed around the reaction tank
At 320°C, it’s definitely a waste heat boiler; install a multi-stage pump to feed water into the cooling tubes, and use the steam generated for lower-grade applications connected to the grid
The temperature inside the reactor is 320°C. Can steam be replaced directly with water to lower the temperature? Will the water vaporize immediately and damage the equipment?
It can be replaced with water, but the coil structure needs to be changed~~~~ The temperature of the water should preferably be 90°C+~~~ Each heat exchange surface either has to be short and thin, or long and thick~~~~ Annular gas (liquid) collection tubes are installed above and below the heat exchange tubes........
Is heat recovery considered? I’ll provide some ideas. Firstly, the temperature difference between the cooling medium and that inside the reactor should not be too large; it is possible to gradually reduce the pressure of the steam used for cooling, employing \"low-temperature\" steam for this purpose, and finding a way to utilize the superheated steam that is generated. Cooling can also be achieved using condensate at a similar temperature, with the temperature of the condensate being controllable using normal water. An external air cooler can also be connected, or the coil can be fed with compressed air directly
Replace steam in the steam coil with water for cooling
To operate a fixed-bed catalytic reactor properly, catalyst loading is the top priority. The catalyst pre-reduction device enables batch-wise pre-reduction of the catalysts, which are then sealed under the protection of an inert gas. Once the installation of the device is complete, the reducible catalysts can be loaded directly, thereby saving startup time and reducing startup costs.
There are many ways to cool reaction vessels, and if heat recovery is to be considered, it depends on your overall process as well
The saturated steam with gradually lower pressure is cooled first