The operation of collecting liquefied gas at a stable position when the catalytic unit is started
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When the catalytic cracking starts, the stable position and the tower top reflux tank collect liquefied gas from the tank area, which facilitates the control of pressure and tower top temperature when starting the operation. Should the liquefied gas be collected after the stable three-tower cycle is established, or should the liquefied gas be collected immediately at the beginning of the operation? What are the precautions for stable collection of liquefied gas? How much liquefied gas should the reflux tank receive? Half or 2/3? I have no operating experience in this area, please give me some advice.~~~~~~~~~~~
Can I ask, how high is the stable system pressure at the beginning of your operation? Will the collected liquefied gas turn into gas phase?
Let me talk about the steps to start the absorption and stabilization system of our device.: 1. Purge the pipeline first, and then test the pressure to see how the seal is. 2. Stop the gas, close the venting of the pipeline, and prepare for gas induction. If the above conditions are suitable and other positions are suitable, start gas injection to ensure that the absorption system has the same pressure as the pipe network. 3. Then collect oil to ensure the three-tower circulation of the absorption stable system. 4. When everything is normal, wait for the reaction to inject fuel. As for liquid hydrocarbons, there is no need to introduce them before construction starts. After construction starts, liquid hydrocarbons can be used as usual.
Even if I don’t have any operating experience in this area, it is also a problem for the 2nd floor. According to what was said above, the liquefied gas should be collected when the temperature is about to rise. During the heating process, the liquefied gas reflux is used to control the top temperature~~~~ There is no need to collect liquefied gas on the 3rd floor. Our factory did not collect liquefied gas before. Sometimes when the top temperature is high, we can only use gasoline to stabilize the tower top temperature~~~ But wouldn’t it be better if we collect liquefied gas to control the top temperature? Under the guidance of those with experience in this field~~~~~~~~
Our start-up steps are the same as yours. We just charge the gas for a period of time when we start the operation. Then vent and dehydrate the low points. When the system pressure is low, we repeat the above process. Our pressure is generally maintained at about 2 kilograms.
There is absolutely no need to collect liquefied gas. If the pressure is low, the vaporization will not achieve the desired top temperature of the liquefied gas pressure. If the pressure is too high for liquefaction, the heat source in the middle section of the ignition tower will be stabilized and the safety valve will trip. So there is no need, just charge it with three or four kilograms and it can cycle through three towers.
I have never heard of collecting liquefied petroleum gas. Without such operations, we would not collect liquefied petroleum gas when we start work.
Does the original poster use a stable system to collect liquefied gas? You can also use gas instead. If you don’t have it, you don’t have to collect it. ； Just charge it to 4-5 kilograms, as long as a three-tower cycle can be established!
The purpose of collecting liquefied gas is to light the torch and maintain a stable positive pressure in the system, in line with the normal start-up sequence. There is no need to collect a lot of liquefied gas in the reflux tank, just 20%.
There is no need to collect liquefied gas. If the liquefied gas is collected, the pressure and temperature of the stabilizing tower must be controlled, which will increase the difficulty of operation when the work is first started. First establish a three-tower gasoline cycle. When the reaction is running normally and there is rich gas, adjust the operation of the absorption tower, then adjust the operation of the desorption tower, and finally adjust the operation of the stabilizing tower. When there is a liquid level in the stabilizing tower reflux tank, establish liquefied gas reflux.
There is no need to collect liquefied gas. As long as a three-tower cycle can be established to ensure normal circulation, the pressure will gradually rise after the heat source heats up. If liquefied gas is collected, it will not be conducive to the pressure adjustment during the heating process.
Don’t accept liquefied gas, safety first, don’t do anything useless but very dangerous.:loveliness: