Several issues regarding the liquid level of the heat extraction drum outside the catalytic unit
Thread Content
Low-low level in the steam drum for external heat removal of the catalytic unit – how to handle it?
If the liquid level in the heat extraction drum outside the catalytic unit is too low, it is necessary to immediately check whether the pumping and supply systems in the system are functioning properly to ensure an adequate supply of liquid. At the same time, check for any leaks or blockages in the pipes. Add more liquid as necessary or adjust the control system to maintain a normal liquid level. .
If you follow the operating procedures, safety must be the top priority. You’re required to stop heat extraction and wait until the catalyst has cooled down before introducing water. However, this can affect the stability of your operations. Based on my personal experience—having carried out this procedure several times—regarding the liquid levels in the drum of the waste heat boiler and the steam generator, my approach is as follows: 1. Shut off continuous blowdown and periodic blowdown, etc. 2. Water should be introduced slowly, while observing the drum pressure, flow rate, etc. 3. Gradually increase the water inflow and monitor the water flow rate. Remember, it’s necessary to gradually increase it step by step until the liquid level appears. Then proceed with the normal operations.
If a low water level is caused by hardware failures in the equipment—such as a coil leak—one should examine changes in parameters like regenerator temperature, pressure, and catalyst density to rule out any equipment-related issues before taking any corrective actions. If the alarm just went off, in my opinion it’s better to slowly increase the opening of the water supply valve and raise the water flow rate gradually. Pay close attention to the pressure and level in the steam drum; slowly establish a stable water level, and then check whether there is a problem with the control valve or the water pump