What are the reasons why the temperature at the top of the hydrolysis tower cannot be increased?
Thread Content
This post was last edited by lxq700918 on 2009-5-11 20:05. What are the reasons why the temperature at the top of the hydrolysis tower cannot be increased? If the hydrolysis is not complete, but the urea content in our analysis wastewater has not increased?
Is the steam pressure normal? Both steam temperature and pressure have a significant impact on hydrolysis
The level of urea in the hydrolysis wastewater depends solely on the temperature of the effluent. As long as the pressure is normal and the effluent temperature meets the required standards, there are no issues with the process, and the wastewater will meet the specified criteria. The temperature at the top of the hydrolysis tower cannot be increased. The fact that the urea content in the waste liquid has not increased indicates that the temperature of the liquid discharged from your system is within the specified range. Suggestions: 1. Check whether the temperature of the feed meets the required standards. 2. Verify if the ammonia concentration in the feed is within acceptable limits. 3. Examine the quality of the steam. 4. Ensure that the thermometers are accurate
Check your hydrolysis tower trays
Thank you all for your replies. I found that our feed temperature is lower than before. The temperature of the liquid leaving the hydrolysis tower is normal; how could the temperature of the liquid entering the hydrolysis tower decrease?
The inlet temperature of the hydrolysis tower decreases; the reasons vary depending on the process. Generally, it is possible to check whether the heat exchanger and the heating source are functioning properly. Based on a detailed analysis of the process flow structure, it is not difficult to identify the cause. From the poster’s description, are you guys using Monsanto’s hydrolysis process?
The ammonia concentration in our ammonia tank is not high. We have found that the temperature in the middle section of the stripping tower has a significant impact on the inlet temperature of our hydrolysis tower. What is the temperature in the middle section of your stripping tower?
Could you provide some data for analysis, such as the hydrolysis pressure, the temperatures in the upper and lower columns under normal conditions, the urea content, and the amount of steam added, etc.?
If the temperature at the upper part of the hydrolyzer cannot be increased, it indicates a high ammonia content in the gas phase. If the urea level reaches the specified value, it means that the desorption capacity of the desorption tower is insufficient, or the load is too high.
The distillation hydrolysis units currently in use generally allow the hydrolyzed gas phase to enter the upper part of the first distillation tower for heat utilization; if the temperature of this gas phase is low, it will result in a low temperature in the upper part of the distillation tower. This can be resolved by increasing the temperature of the hydrolysis tower.
Is the liquid level in the hydrolysis tower too high?