Analysis of CO2 heating passivation process

It’s a condensation state! ! CO2 and water vapor are exothermic! In order to heat up the wall of the vessel!

Strictly speaking, during the CO2 temperature-raising passivation process, CO2 and water vapor are heated in the high-pressure condenser, not condensed. During the CO2 temperature-raising passivation process, the purpose of adding steam to the shell side of the high-pressure condenser is to prevent the heated steam from being condensed here, otherwise the heated steam cannot enter the urine tower to heat up. However, during actual operation, a small amount of heated steam still needs to be condensed.

This post was last edited by Hainachuanhe on 2010-1-2 22:48. This question is very simple. You can refer to several data for comparison.: 1. When the system CO2 is heated up and passivated, the steam pressure on the shell side of the stripping tower has been raised, which is about 1.7---1.8MPa. The outlet temperature of the stripping tower (entering the high-temperature cooler) generally has no temperature indication. You can refer to the temperature of the high-pressure jet pump pipeline after the gas blow-by. The temperature shows that the temperature is about 190, that is, the CO2 temperature entering the high-temperature cooler is about 190. 2. The steam pressure on the shell side of the high-temperature cooler is generally controlled at 0.5---0.55MPa, and its corresponding temperature is 154.76 (0.54MPa saturated steam). 3. The above two data show that when the system CO2 is heated and passivated, the temperatures of the high-cooler tube and shell are determined. So, can we judge whether the CO2 and water vapor are being heated in the high-pressure condenser? Or is it condensation?

Of course it is condensation, otherwise how to passivate the surface of the equipment to prevent corrosion?

This is a good question. I agree with the views of the two people above. During the heating and passivation process, the high methyl cold is in a condensation state. This also brings up another problem? During temperature rise and passivation, the steam pressure on the shell side of the stripper must be at least higher than the steam pressure on the shell side of the high-cooler.

I don't understand a bit: Then why do we need to introduce steam on the shell side of the high-pressure ammonium methane condenser? Moreover, when the heating rate of the synthesis tower is slow, it is necessary to increase the drum pressure to achieve the purpose of increasing the heating rate of the synthesis tower?

Before adding ammonia to the system, the high-cooler has no reaction heat supply. Feeding steam to the shell side and increasing the pressure can reduce the temperature difference between the shell side and the tube side of the high-cooler, reduce the heat loss in the high-cooler, and facilitate the supply of heat to the synthesis tower.

Thank you "Hainachuanhe" Haiyou for your patience and in-depth analysis. Learn from Haiyou, the "Hainachuanhe" * .

Another step in temperature rise passivation is to open the heating steam valve on the shell side of the high-pressure condenser. The purpose is to maintain the LS steam pressure at 0.05-0.1MPA so that the temperature rise can proceed smoothly.

What is the temperature difference between entering and exiting the stripping tower and the high-methane cold steam? How much air flow control? Does the vent valve of the synthesis tower need to be fully closed? The wall temperature of the synthesis tower is A\B\C\D from top to bottom. Point B is the highest and is 10% higher than points A, C and D.℃ ； Why?