If desorption is not carried out

Without the analysis system, it’s more stable, with a lower water-carbon ratio; only the consumption is higher! Your company’s desorption unit is likely too large; otherwise it should be able to operate continuously. Operating it intermittently leads to process instability, requires adjustments to various system parameters, and results in higher consumption.

Without desorption, how can ammonia in the process condensate be recovered? ? The unit where the poster works fails to properly control the desorption load; it’s not possible to process all of the process condensate within a few days, as this will disrupt the system’s water balance.

Reply to 2# Jianghuai Qingfeng: Well, only desorption can be used to reduce the amount

Reply to 3# ty0ty00: We used to receive ammonia from outside frequently, with a high desorption level; now that there is no ammonia available, we have to reduce that level.

How is your analysis designed? What is the amount of external dilute ammonia water? Is the impact that significant? There are partitions inside the ammonia tank, which divide it into a large tank and several smaller tanks; there is a small hole at the bottom of these partitions, allowing communication between the large tank and the smaller ones. The large tank is connected to the discharge pipe of the low-pressure circulation system, while the small tanks are connected to the downflow pipes of the condensers in the evaporation system. The feed pump of the desorption tower draws in the fluid from the small tanks. The purpose of designing the partition is to separate the secondary steam condensate from the flash tank, which contains high concentrations of ammonia, from the secondary steam condensate from the second-stage evaporator, which contains high concentrations of urea, so that these can be used as absorbent fluids in a 0.6 MPa absorption system or a low-pressure absorption system. It also helps to isolate the high-concentration ammonia solution that is released during system shutdown, thereby preventing excessive concentrations in the feed to the desorption and hydrolysis system and contributing to the stability of its operation. As the liquid level in the ammonia tank decreases, the high-concentration ammonia solution in the larger tank flows slowly into the smaller tank through the holes in the partition, without affecting the normal operation of the desorption and hydrolysis system. If the amount of incoming dilute ammonia water is unstable, it can be stored in a large tank for buffering

Reply to 6# nienidenai: All the condensate from our evaporative condensers flows into a separately designed evaporative condensate tank; once this tank is full, the excess liquid overflows into the ammonium carbonate tank. The evaporated condensate is used for low-pressure absorption, while the ammonium carbonate solution is used for both low-pressure absorption and desorption. In the past, when the amount of ammonia from outside was high, it was 50 to 60 cubic meters per day.

Fifty to sixty cubic meters per day, which is a little over 2 cubic meters per hour – will this affect the intermittent operation of the desorption process?

Reply to the original poster: In the 1970s, medium-sized plants were popular among farmers due to ammonia, and desorption was not carried out; the system worked normally.