Decrease biuret in urea prill

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Viewing 15 posts - 1 through 15 (of 17 total)
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  • #101865
    Mark Brouwer
    Keymaster
      • Expert

      It is certainly a food idea to control the temperature as accurate as possible. But do not forget the areas in the melt line which are not jacketed! Bends, flanges, valves etc.
      I would suggest to look also at solutions like:
      https://ureaknowhow.com/ukh2/library/660-2012-08-hartman-csi-engineered-thermal-solutions-in-urea-plants.html

      #101864
      govindtripathi
      Participant
        • Participant

        Hi, everybody
        I think if we could apply electrical heat tracing at 133 deg C very precisely in final molten line where Bi accelerate rapidly, it may help a lot to keep at the limit of 0.7% .
        What is opinion from all of you.

        #101591
        norozi1972
        Participant
          • Expert

          Dear Mark
          can you send a brief description about urea crystallization process.(PFD – P@ID).
          WITH BEST REGARD
          NOROZI

          #101590
          Mark Brouwer
          Keymaster
            • Expert

            AdBlue is 32.5 wt% urea in water

            #101589
            Mark Brouwer
            Keymaster
              • Expert

              Since about 20 years crystallisation is not implemented in new plants, on the contrary several crystallisation plants have been revamped to evaporation to reduce maintenance and energy costs.
              In case one wants to produce directly AdBlue as a solution, the technology to realise that is quite simple and several new plants have included that in their basis of design.
              In case one wants to produce solid urea suitable to dissolve as an AdBlue solution it becomes more complicated and one needs to adjust operational parameters and do some small revamps to reduce biuret levels sufficiently.

              quote Mocznik_Police post_id=9323 time=1578652713 user_id=4648:

              Dear All,

              Is cristallization still avalaible in new plants or rather evaporation is more popular in present technology? Is it possible to revamp with crystallization?

              #101588
              dzax
              Participant
                • Participant
                quote mark.brouwer post_id=9253 time=1576233506 user_id=2:

                In principles one should reduce temperatures and residence times. The precise and highest priority actions will result from an assessment of your plant.

                Reducing the biuret to .7x wt% will provide sufficient operational flexibility to assure an on-spec product. I am talking about urea plants who want to produce prills suitable for Ad Blue / DEF.

                Let me know in case anything is unclear

                Mark

                Dear Mr. Mark

                Thank you for your answer.
                For the Adblue, what is the consumption rate Urea (ton/litre adblue) and demin water (ton/litre adblue) ?

                Best Regards

                #101587
                mocznik-police
                Participant
                  • Expert

                  Dear All,

                  Is cristallization still avalaible in new plants or rather evaporation is more popular in present technology? Is it possible to revamp with crystallization?

                  #101582
                  tarek2000
                  Participant
                    • Participant

                    if the Biruet content in the final product suddenly increase , i think you should check :
                    1- the Steam pressure of steam tracing surrounding the Urea melt line downstream Evaporation (high concentration solution) – , if the Tracing pressure is regulated via PCV ,then you should check it !
                    if higher steam tracing pressure than normal , Biruet content would increase .
                    2-Urea melt solution Outlet temperature , Temperature transmitter may need calibration or changing because it would give fake temperature measuring leading to higher steam valve opening on shell side of the Evaporator leading to higher Biruet content.

                    Mohamed Tarek
                    operation engineer
                    Alexfert

                    #101581
                    Mark Brouwer
                    Keymaster
                      • Expert

                      With crystallisation technology, one can realise lower figures than 0.7 wt%, typically biuret is in the range of 0.1-0.5 wt%.

                      With evaporation technology one can realise 0.8-0.85 wt% and with several further operational and revamp steps 0.7x wt%.

                      A detailed plant assessment / study will identify these steps.

                      #101578
                      norozi1972
                      Participant
                        • Expert
                        quote mark.brouwer post_id=9253 time=1576233506 user_id=2:

                        In principles one should reduce temperatures and residence times. The precise and highest priority actions will result from an assessment of your plant.

                        Reducing the biuret to .7x wt% will provide sufficient operational flexibility to assure an on-spec product. I am talking about urea plants who want to produce prills suitable for Ad Blue / DEF.

                        Let me know in case anything is unclear

                        Mark

                        Dear Mark
                        Thanks a lot for your attention and your answer
                        My question is that can we recieve the 0.7 biuret content with traditional cocentration of prill urea plant or with crystalization process ?
                        With best regard
                        Norozi

                        #101577
                        Mark Brouwer
                        Keymaster
                          • Expert

                          Yes Stami Coat is the same as Advance Coat

                          #101576
                          ahmad0100
                          Participant
                            • Participant

                            Dear Mr Mark
                            What is your meant to use Stamicoat ,Is it advance coat or other coating for anti caking purposes?

                            #101529
                            Muhammad Kashif Naseem
                            Participant
                              • Expert

                              As mark highlighted . we are running the same plant with biuret 0.8-0.82 wt% and Stamicoat as an anti caking agent.

                              #101528
                              Mark Brouwer
                              Keymaster
                                • Expert

                                In principles one should reduce temperatures and residence times. The precise and highest priority actions will result from an assessment of your plant.

                                Reducing the biuret to .7x wt% will provide sufficient operational flexibility to assure an on-spec product. I am talking about urea plants who want to produce prills suitable for Ad Blue / DEF.

                                Let me know in case anything is unclear

                                Mark

                                #101527
                                dzax
                                Participant
                                  • Participant

                                  Dear Mark Brouwer,

                                  What is the action plan to reduce the biuret content from 0.82 to 0.7 ? and
                                  why the 0.7 become the target value, any other purpose for the other downstream urea’s product ?

                                  You also say regarding the Ad Blue products, could you explain it in detail. based on the other papers, it was explained the biuret content requirement shoud be less than 0.3 wt%, any urea plant could fullfill this requirement ?

                                  Best Regards

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