Deep hydrolysis of the desorption waste liquid from the urea plant
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There are many manufacturers that apply the deep hydrolysis technology using urea. As far as I know, regardless of the deep hydrolysis technique used, it is rare for the NH3 and Ur levels in the effluent from the desorption tower to be below 5 ppm. I invite everyone to share the specific issues, operational practices, and experience gained from modifications in their respective plants, so that we can exchange ideas and truly achieve a win-win situation for all parties: environmental protection, zero emissions, and ammonia recovery.
Monsanto’s deep hydrolysis truly meets your requirements
Hehe, why does it have to be such that the Ur content is below 5 ppm? That’s a bit too strict. As long as the NH3 level is met…
Desorption and hydrolysis form a single system, and few manufacturers manage to meet this standard. Are the first and second desorption towers operating properly? This post was last edited by yunanshu on 2008-2-1 08:51]
The reason why NH3 and Ur in the effluent from the desorption tower must be less than 5 ppm is to enable recovery for use as boiler water. Some factories actually fail to meet the targets, mainly due to exceeding their designed capacity. It is possible to achieve NH3 and Ur levels of less than 5 ppm in the effluent from the hydrolysis tower by appropriately increasing its operating temperature.
I believe that if the concentration of the waste liquid is not very high, and if the temperatures and pressures in the hydrolysis tower are kept within normal ranges, as well as those in the stripping tower, then it should be fine to have NH3 and Ur levels below 5 ppm
I heard that in China, several large fertilizer manufacturers were able to meet their capacity expansion requirements by modifying only the trays in the hydrolysis-desorption systems used for these processes; at the same time, the levels of NH3 and Ur in the effluent from these towers remained below 5 ppm. Does anyone know which manufacturers these are?
In hydrolysis-desorption systems, many hydrolysis towers use baffle plates, while desorption towers employ packing. I think the results are good; the process parameters are basically met
We used an independent hydrolysis system and achieved all the required specifications without any calibration.
Stemica B.V. in the Netherlands has good hydrolysis technology
Bester in Texas can meet your requirements; there are existing application examples in China, which you can visit to take a look. For more details, please email dzbst2009@163.com. Phone: 13905347959