Why every Urea Plant needs a Continuous N/C ratio measurement ? ITS VERY IMP OF UREA ASSOCIATES

Process Paper February 2011
1
Why every Urea Plant needs a
continuous N/C ratio measurement ?
Spie Nederland B.V.
Mr. Jan Huijben
Contents
̶ Why every Urea Plant needs a Continuous N/C ratio measurement ?
̶ In general
̶ Introduction
̶ General set-up of the N/C metering instrument
̶ Technical description of the system
̶ The N/C metering system has the following features
̶ Example of cost reduction
̶ Plant advantages
̶ Spie introduction
Why every Urea Plant needs a Continuous N/C ratio measurement ?
1. To achieve the most efficient production of good quality urea.

The figure on the right side shows the urea concentration in the outlet of the urea reactor versus the
N/C ratio and it clearly shows that there is an optimum N/C ratio at which the urea concentration is maximum. Operating continuously at this optimum N/C ratio leads to the lowest energy consumption figures, the lowest ammonia emission figures and you will be able to increase the plant capacity by means of creep.You will obtain the most efficient urea production with the lowest urea cost price.Several factors can easily cause that one drifts away from the optimum N/C ratio; think for example about different ambient and cooling water temperatures during day and night. The more efficient production and increased capacity leads to a payback time of less than one year!

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