The issue of energy conversion in control valves during urea production
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In the urea production process, such as in the urea production using the carbon dioxide stripping method, the urine stream coming out of the carbon dioxide stripping tower passes through the control valve LV2102, which reduces its pressure from 145 bar to 4 bar. How is energy transferred during this process? Are there any special requirements for such valves?
The pressure drop of this control valve is indeed quite high, at 14.5 MPa to 0.4 MPa, which is almost on par with that of a pressure reducing valve. Since control valves are often designed as globe valves, pressure drop can be caused by various factors. 1. In fluid mechanics, pressure is inversely proportional to flow velocity; that is, when pressure drops, the flow velocity of the medium increases. 2. An air erosion-resistant valve cage or a noise-reducing valve cage is used. 3. The pipeline downstream of the valve has narrowed. 4. The natural pressure loss is relatively high; in other words, the flow resistance inside the valve is large, and the energy of the medium is converted into heat energy. This post was last edited by leonnie on 2009-2-10 23:30]