Status : Verified
| Personal Name | Santayana, Gerald A. |
|---|---|
| Resource Title | Co-firing of Refinery Oily Sludge and Petcoke in a Large-Scale Circulating Fluidized Bed (CFB) Power Plant |
| Date Issued | 25 November 2023 |
| Abstract | Co-firing of oily sludge with petcoke into large-scale circulating fluidized bed (CFB) boilers has been considered one of the most suitable methods for handling sludge disposal in the refinery. Waste-to-energy applications, such as incinerating industrial sludges in boilers, have become more practical due to the high cost of external reprocessing. However, one of the main challenges for making wastes like oily sludge viable as supplemental fuel is its high moisture content. Furthermore, petcoke, a byproduct of the refinery's delayed coking unit (DCU), has a high sulfur content and heating value, which makes it incompatible with other materials lacking similar properties, potentially leading to operational instability during co-firing. In this study, three types of refinery oily sludge were characterized, namely, the dissolved air flotation (DAF) biosludge, DAF oily sludge, and impounding basin (IB) sludge. These sludges were subjected to simultaneous air and solar drying. Among all the sludges considered for co-firing, only DAF biosludge, with a final moisture content of 20.4%, was deemed acceptable. Considering the properties of biosludge and petcoke, as well as the constraints in the CFB boiler, the maximum amount of sludge in the feed was calculated to be 12% by weight. Two co-firing trials with petcoke and dried sludge were conducted to observe their effects on boiler parameters. In the first trial, with 6% sludge by weight, a gradual decrease in main steam pressure was observed, followed by an increase in solid fuel flow. Similar trends were observed in the second trial with 5% sludge by weight. Both trials showed an increase in main steam flow, furnace temperature, cyclone seal pot temperature, bag filter differential pressure, and stack temperature. SOx emissions during co-firing remained stable, and the contribution of low-sulfur sludge in the fuel feed was insignificant. Overall, the impact in the boiler parameters when firing refinery oily sludge with petc |
| Degree Course | Master of Science in Energy Engineering |
| Language | English |
| Keyword | co-firing; petcoke; circulating fluidized bed; waste-to-energy; refinery oily sludge |
| Material Type | Thesis/Dissertation |
Preliminary Pages
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Category : I - Has patentable or registrable invention of creation.
Access Permission : Limited Access