Factors affecting the pressure in high-pressure systems
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CO2 stripping urea plant: What are the factors that affect the pressure in the high-pressure system? How should it be judged and handled?
There are quite a few factors here. The most important ones include the N/C ratio compared to the H/C ratio, the purity of the raw materials, as well as operating pressure and temperature.
This post was last edited by Xieshui on 2010-5-29 at 21:32. The principles of the urea production process are all explained; theoretically, in a system for producing urea from ammonia/CO2, pressure is not an independent variable – it is determined by the reaction temperature and the N/C ratio. Higher reaction temperatures result in higher pressure, as does a higher or lower N/C ratio (since CO2 stripping requires the lowest possible N/C ratio). In actual industrial production, the pressure in the high-pressure system is influenced by factors such as the reaction temperature (the pressure in the low-pressure drum), the N/C ratio, the condensation volume in the high-efficiency scrubber (there are many other factors, such as failures in the rupture disks), the inert gas content, the water/urea ratio (the addition of water reduces the pressure), the opening degree of the exhaust valve, and any overruns in the liquid level in the condenser. In production, these basic influencing factors are carefully monitored.
Adding to what was said on the 2nd floor: there is also a leak in the partition of the high-pressure ammonium hydroxide condenser, and the pressure of the low-pressure steam is one of the factors that affect the pressure of the high-pressure system
Regarding pressure control, especially in the event of an accident when pressure rises rapidly, the ability to promptly and accurately identify the cause and take appropriate action is what distinguishes experts from ordinary operators.
The pressure in the high-pressure system is affected by many factors, such as N/C, H/C, the purity of the feed gas, the pressure in the low-pressure drum, backflow of carbon dioxide due to a low liquid level in the synthesis tower, stuck gas valves in the scrubber at a low position, abnormalities in the high-pressure water supply system, and the heating steam used in the stripping tower, among others! The pressure level is taken into consideration comprehensively!
Also, after feeding into the empty tower, it is necessary to maintain a certain amount of gas venting to release inert gases; otherwise, overpressure will occur once material is discharged.