Experimental investigations of vanadium and nickel distribution while firing petcoke in a circulating fluidised bed test facility Online publication date: Wed, 05-Dec-2018
by J. Jaygopal; K. Ganesh Palappan; M. Lakshminarasimhan; M. Rajavel; S. Suresh
International Journal of Oil, Gas and Coal Technology (IJOGCT), Vol. 20, No. 1, 2019
Abstract: Petcoke was fired as independent fuel in CFB test facility and the distribution of vanadium and nickel throughout the boiler and its deposition rate was assessed. It was found out that during combustion, 7%-8% of the total vanadium is in bottom zone of furnace, 31%-33% is in circulating zone, nearly half of total V (47%-49%) is in second pass and the rest 11%-15% got deposited in the boiler or escaped through the stack. Meanwhile in the case of nickel, 26%-29% is in primary loop and rest 66%-68% is in second pass. Vanadium deposits were found as inclusions in lime based deposits. XRF and XRD analysis of loose deposits found in back pass confirms the presence of vanadium. It was noticed that although petcoke contains high amount of vanadium and nickel, most of them were absorbed in situ limestone and turned to stable solid form. [Received: February 1, 2017; Accepted: July 6, 2017]
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