Effect of Operation Parameters on the Slagging near Swirl Coal Burner Throat

• Published in: Energy & fuels Vol. 20; no. 5; pp. 1855 - 1861
• Main Authors: You, Changfu, Zhou, Yong
• Format: Journal Article
• Language: English
• Published: Washington, DC American Chemical Society 20.09.2006
• Subjects: 01 COAL, LIGNITE, AND PEAT; Applied sciences; BURNERS; COAL; COMPUTERIZED SIMULATION; DEPOSITION; Energy; Energy. Thermal use of fuels; Equipments for energy generation and conversion: thermal, electrical, mechanical energy, etc; Exact sciences and technology; FUEL-AIR RATIO; Furnaces. Firing chambers. Burners; PARAMETRIC ANALYSIS; PARTICLES; SLAGS; Solid and pulverized fuel burners and combustion chambers; VORTEX FLOW; Numerical analysis; Fouling; Swirl burner; Flow(fluid); Coal; Heat flow; Combustion; Heat transfer
• ISSN: 0887-0624; 1520-5029
• DOI: 10.1021/ef0600107

Fluid flow, heat transfer, coal combustion, and slagging processes had been numerically simulated near a swirl burner throat. The effect of the ratio distribution of each burner air, their swirling numbers, and the coal character on the slagging process had been analyzed. The computation results indicate that the maximal sticking-particle numbers occur at the uppermost waterwall, while the sticking-particle number at neither waterwall near the swirl burner outlet is very small. The swirling number has a significant effect on the number of the sticking particle. The sticking-particle number increases rapidly with the increment of the outer secondary air and the primary air-swirling numbers, respectively, because it can strengthen the flow entrainment ability to carry more particles to the waterwall. The inner secondary air has a complicated influence on the slagging process. When the inner secondary air-swirling number is about middle intensive degree (about 0.9), the sticking-particle number reaches maximum. If the inner secondary air-swirling number continues increasing, then the coal particles will combust completely and reduce the particle concentration, thus decrease the sticking-particle number. The ratio of each air has a slight influence on the sticking-particle number relative to the swirling number. The coal particles with small mean diameter combust completely, which can reduce the sticking-particle number.