On the granulation technology of the full-circulation aqueous solution method

There is basically no difference between the CO2 stripping method and the aqueous solution method in terms of evaporation systems, so the granulation method can be applied universally.

It is said that the carbon dioxide stripping method has much lower energy consumption. However, in recent years the fully closed-loop aqueous solution method has also developed rapidly, with significant technological advancements; in some cases it is not inferior to the stripping method. Therefore, the key factor remains the level of technology

Urine nozzles for granulation using the full-circulation aqueous solution method; however, there are various types of nozzles, and those for large particles are used with drum granulators

Thank you so much. . . Recently, the network at my workplace has been poor; on top of that, I need to work on the website for the design company as well as conduct research on projects. . I’m going crazy. . . Thank you all for your help; it solved many problems. . . Overall, it seems that CO2 is used to a greater extent; most of the manufacturers of water-soluble versions appear to be Sinochem. . And it seems that the water-soluble version has a better environmental impact, right?

In response to the somewhat unclear questions raised by the original poster, I will provide an explanation based on my understanding, in the hope that it will give you a relatively comprehensive overview of urea granulation: Urea granulation is the final step in the urea production process. Its task is to granulate molten urea at 99.7% (by weight; some large-grain production techniques use 95%) and at a temperature of 135–140°C, thereby producing granular urea products, which are then transported via conveyor belts to the packaging area for measurement and packaging. Currently, for the production of granular urea worldwide, there are two granulation techniques: tower (granulation tower) spray granulation and mechanical granulation. 1. Tower-type spray granulation technology: The common feature of tower-type spray granulation technology is that molten urine with a concentration of 99.7% is sent to the top of the granulation tower and enters the granulation nozzles. Under the action of rotation of these nozzles, the urine is sprayed out through small holes in the nozzle walls to form droplets. As these droplets fall, they come into contact with air flowing upward, gradually cooling and crystallizing into particles. These particles then fall to the bottom of the tower, where they are scraped by a scraper into a discharge hopper, from there onto a conveyor belt, and finally to the warehouse or directly packaged. Depending on whether a seed is added in the tower, this technology is divided into conventional tower granulation and seed tower granulation. 2. Mechanical granulation technology: This technology is widely used in the production of various fertilizers such as phosphoric acid, calcium-based fertilizers, urea, and compound fertilizers. In the production of urea, it includes drum granulation, tray granulation, and fluidized bed granulation. Currently, the widely used technologies include Hydro’s fluidized bed granulation technique from Norway, Snarnprogetti’s drum granulation technique, and Tee’s jet bed granulation technique. Among these, Hydro’s fluidized bed granulation technique is the most representative and has been used in the most plants. Of course, regardless of the urea production process, the granulation technology can be chosen based on the specific needs of the enterprise; any granulation technology can be used. This post was last edited by lxq700918 on 2009-3-4 20:17.]

For small particle granulation technology, whether it is an aqueous solution method or a carbon dioxide stripping process, the granulation technique remains the same; the only difference is that the carbon dioxide stripping process has a higher production capacity, larger granulation towers, and a scraper is usually installed at the bottom of these towers. Another granulation process produces large particles, using the Hydrulic drum granulation technology. That is, the granulation process cannot be classified and differentiated using the urea production process.