Study of Desalting of Oil Sludge and Its Use for the Production of RDF-5
Date Issued
2011
Date
2011
Author(s)
Chang, Shih-Hsuan
Abstract
This study consists of two parts, the desalting of oil sludge and the production of refuse-derived fuel-5 (RDF-5) from oil sludge. A high-gravity rotating packed bed (HGRPB) was used for the desalting of oil sludge. Steam was injected into the HGRPB. When steam contacts the oil sludge, it transfers the heat to the oil sludge and is condensed into water, dissolving and extracting the salts from the oil sludge. The results indicate that the desalting efficiency (η) is over 60% with the steam temperature (TS) within 140-220 ℃ and steam extraction time (t) of 25 min. For example, at TS = 140 ℃ and t = 25 min, the η can reach 78%. Steam can increase the temperature of oil sludge, reducing its viscosity. However, an excess amount of steam causes the volatilization of light hydrocarbons from the oil sludge, resulting in the decrease of heating value.
The flow rate of steam increases with TS. The excess steam increases the water content in oil sludge, slowing down the de-watering and retarding the extraction of salt from oil sludge. The results show that the TS at 140℃ is better than 220 ℃ for desalting. The t is also an important factor. A short t may result in incomplete mixing. At least a t of 10 min is needed. At 10 min, the η becomes stable and closes to that at 25 min, indicating that HGRPB can give efficient desalting of oil sludge in a short steam extraction time.
The RDF-5 was made by adding a portion of biomass to the oil sludge based solid fuel (un-desalted). According to the analysis of RDF-5 made, the heating value is quite high. Therefore, it is vital to consider the heat loading of burner, in order to avoid the damage of the hearth.
In the market of solid fuel, the boiler user express that if the price and heating value is close to the present fuels (fossil fuels), they are willing to partly substitute the RDF-5 for the present fuels. It means that the acceptable fuel is no longer limited to fossil fuels. As long as the price and heating value are acceptable and the chlorine and sulfur contents are under limitation, the biofuels such as biomass-based fuels are among the suitable and alternative choices.
Subjects
Oil sludge
desalting
high-gravity rotating packed bed
Type
thesis
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