Is the ammonia synthesis tower heating up and starting?
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After a short-term shutdown of the system, the current process conditions are: the system pressure is 220 kg, and the tower catalyst hot spot temperature is 430°C. The fresh air is qualified, please discuss how to shorten the driving time as much as possible. Normal operating temperature is 480℃.
The temperature rise of the synthesis tower is limited by the capacity of the electric furnace, so the initial temperature rise requires lowering the operating pressure to reduce the airspeed, and then increasing the pressure and adding load after reaching the activation temperature of the catalyst. According to the situation described by LZ, as long as the upper temperature is higher than the catalyst activation temperature and the temperature difference between the highest and lowest points is not greater than 50 degrees, there is no need to reduce the pressure. Start the circulation machine under the protection of the electric furnace to replenish fresh gas and operate according to the normal loading procedure. After the temperature reaches the operating temperature, gradually increase the pressure to the operating pressure.
Let me see if this post is helpful to you. How can you remove ammonia as quickly as possible after short-term removal?
Such a high temperature must be above the catalyst activation temperature, and the system pressure is sufficient. At this time, there is no need to activate the electric furnace. You can directly introduce fresh gas and start the circulation machine. When the bed temperature rises, you can slowly enter full-load production.
You can turn on the electric furnace with a small circulation volume, open the main circuit, then add fresh air appropriately, slowly turn off the main circuit and raise the temperature, and then gradually increase the amount.
The amount of fresh air can be introduced faster and in a larger amount. The same is true in our factory. It usually takes about 30 minutes to reach normal operation.
The synthesis system can be loaded faster. If the temperature of that layer is high, open the cold shock valve of that layer to speed up the ammonia reaction. As long as the outlet temperature can be guaranteed, try to open the large inlet valve of the synthesis tower as fast as possible.
I agree with the fourth floor's point of view. The temperature of the synthesis furnace is within the reaction temperature zone. I think that fresh air should be directly vented, the circulation machine should be started, and the temperature generated by the reaction should be gradually raised. During the heating process, excessive heating speed should be strictly controlled. Each catalyst layer should be gradually raised step by step, and the temperature should be raised layer by layer. After reaching the operating temperature, the pressure should be raised.
At this time, the catalyst temperature is within the active range. You can directly turn on the circulation machine, slowly add fresh air, and adjust the temperature to the normal range. There is no need to turn on the electric furnace.
Start the circulation machine, open the shortcut of the system, and directly introduce a small amount of fresh air. Add more when the temperature rises. We usually replenish the gas and synthesize it above 380 degrees, there is no need to charge it at all, and the catalyst has been used for the third year. The key is not to increase the gas volume too quickly when starting to replenish the gas. The catalyst temperature will drop slightly at first, but it will soon stabilize or go back up. At this time, you can gradually increase the gas replenishment volume.
At a temperature of 430 degrees and a pressure of 220 kilograms, you can just replenish the air and drive.