The effects of sodium sulfate on the emissions characteristics of an emulsified marine diesel oil-fired furnace
✍ Scribed by Cherng-Yuan Lin; Jenq-Yih Pan
- Publisher
- Elsevier Science
- Year
- 2001
- Tongue
- English
- Weight
- 640 KB
- Volume
- 28
- Category
- Article
- ISSN
- 0029-8018
No coin nor oath required. For personal study only.
✦ Synopsis
Degraded diesel oils are commonly used in marine power plants to conform to the demands of shipowners for fuel economy. The burning of these marine fuel oils, which frequently contain various extents of oxides of iron, silicon, calcium, vanadium and potassium, such as Na 2 SO 4 , Fe 2 O 3 , SiO 2 , CaO, V 2 O 5 , etc., are susceptible to form much more complex compounds of either gaseous or solid phases. The release of these emissions to the environment may cause atmospheric pollution and a health hazard to human beings. Emulsification of a fuel oil with water to produce a micro-water-particles-dispersed-in-oil (W/O) emulsion has been considered as one of the promising techniques to improve combustion characteristics of low-grade marine oils and in turn effectively help to reduce the release of air pollutants. Marine fuel oil A, which approximates ASTM No. 2D oil was used as the test oil and the surfactant Span 80 was used to promote the affinity and integrating force between the components of the emulsion. An emulsifying/homogenizing machine was employed to stir the emulsion mixture of the marine oil, distilled water, surfactant Span 80 and sodium sulfate (Na 2 SO 4 ) powder of 300 ppm. The mechanically blended emulsion mixture was injected, atomized and burned in an oilfired furnace using an automatic burner. Burning gas composition, burning efficiency and gas temperature were measured and analyzed. Compared to neat marine diesel oil, W/O emulsions had higher combustion efficiencies, higher concentrations of O 2 and SO 2 , while gas temperatures were lowered and CO and NO x production was reduced. The addition of sodium sulfate decreased combustion efficiency and NO x concentration and increased O 2 , CO, and SO 2 concentrations.