Enhancing the Coke Quality and Yield by CDQ Process Optimization

Abstract

The advantage of coke dry quenching (CDQ) over the conventional wet quenching process in coke making not only helps in reducing the coke moisture (<1%) but also helps in power generation, by utilizing the sensible heat of incoming hot coke in the CDQ chamber. In addition to these benefits, other advantages are – Prevention of dust emission during coke quenching, Improvement in the performance of Blast Furnace, and Improved coke quality. In the CDQ process, the coke yield can be improved by reducing the solution loss reaction within the CDQ chamber. To achieve the same, a plant trial has been taken at the CDQ unit of Tata Steel Jamshedpur, with higher CO and H₂% in the recirculating gas composition. The trial results found that it significantly affects coke quality and enhances the coke yield by 0.3% due to a reduction in solution loss reaction in the CDQ chamber. In the current article, methodology used to reduce the solution loss reaction and its positive impact on coke quality and coke yield is discussed.