AT reduced load Bi-uret can be controlled by following measures.
1- Keep urea solution levels in holders as low as possible ie MP/LP/veauum section.
2- Keep NH3/CO2 ratio slightly on higher side.
3- Maintain urea stripper temperature ~ 198-200oC for snam technology.
3- For plants using prill tower, urea melt delivery line on prill tower is normaly jacketted with low pressure steam, here urea melt gets both residence time & temperature, reduce jacketting steam in this line in case of low load operation.
4- If dust solution recovery is ongoing reduce its flow rate.
1- Keep urea solution levels in holders as low as possible ie MP/LP/veauum section.
2- Keep NH3/CO2 ratio slightly on higher side.
3- Maintain urea stripper temperature ~ 198-200oC for snam technology.
3- For plants using prill tower, urea melt delivery line on prill tower is normaly jacketted with low pressure steam, here urea melt gets both residence time & temperature, reduce jacketting steam in this line in case of low load operation.
4- If dust solution recovery is ongoing reduce its flow rate.
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