Ignition characteristics of co-fired mixtures of petroleum coke and bituminous coal in a pilot-scale furnace

Clements, Bruce; Zhuang, Qixin; Pomalis, Richard; Wong, J K; Campbell, D.B.

doi:10.1016/j.fuel.2012.01.009

Cited by 15 publications

(8 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Sufficiently high heating rates for PC can be obtained using small or miniature benches, but these heating modes are still clearly different from the heating mode used in an actual furnace, which mainly involves the convective heat transfer of high-temperature gas. Different heating modes affect the ignition characteristics; therefore, results obtained using small or miniature benches, in contrast to results obtained with a pilot-scale experimental facility, are not fully applicable to guiding industrial applications. , The present study conducted experiments using a 250 kW pilot-scale bias combustion simulator (PBCS) . The intersection and ignition of six jets were achieved for the first time, as follows: From top to bottom, two jets of bias PA/PC flow were injected into the primary combustion zone of the furnace and then mixed with two jets of high-temperature flue gas and ignited.…”

Section: Introductionmentioning

confidence: 99%

Effect of the Primary Air Velocity on Ignition Characteristics of Bias Pulverized Coal Jets

Zeng

Sun

Yang³

et al. 2017

Energy Fuels

View full text Add to dashboard Cite

Experiments were conducted under a hot condition of bituminous coal ignition in a 250 kW pilot-scale bias combustion simulator. The effects of the primary air velocity (PAV) on the ignition characteristics of bias pulverized coal jets in a reducing atmosphere were investigated to develop a better new burner for experimental bituminous coal. Multiple means of measurement and sampling were used for the axial and radial temperatures, flame spectrum, flue gas components, and residual solid inside the furnace. The standoff distance changed nonmonotonically between axial distances of 90 and 330 mm with increasing PAV and was shortest for a PAV of 16 m/s. The radiation heat transfer from the hot environment had more effect on the ignition than the convection heat transfer from high-temperature flue gas in the initial stage, while the convection heat transfer from the high-temperature flue gas played a greater role in the subsequent combustion of the char. At PAVs of 13 and 16 m/s, there was volatile and char homogeneous–heterogeneous combined ignition and one-mode combustion; at PAVs of 20 and 23 m/s, there was volatile-phase homogeneous ignition and two-mode combustion. The ignition of the fuel-rich jet lagged that of the fuel-lean jet at a PAV of 13 m/s. A PAV that is lower could not take advantage of bias pulverized coal combustion technology. The ignition of the fuel-rich jet was ahead of that of the fuel-lean jet at PAVs of 16, 20, and 23 m/s. At a PAV of 13 m/s, the position of stable ignition was the shortest, the temperature of stable ignition the highest, and the boundary of the stable flame the smallest. The PAV of 16 m/s provided the best ignition characteristics for bituminous bias pulverized coal jets, which is suitable to be selected as design PAV for the new burner development.

show abstract

Section: Introductionmentioning

confidence: 99%

Effect of the Primary Air Velocity on Ignition Characteristics of Bias Pulverized Coal Jets

Zeng

Sun

Yang³

et al. 2017

Energy Fuels

View full text Add to dashboard Cite

show abstract

“…Additionally, it is possible to introduce the biomass in a simple way, at the centre of the flame generated by the coal, and it is technically feasible to use a particle size bigger than that of coal. This involves a reduced pre-treatment cost compared to other types of co-firing [24].…”

Section: Co-firing In Conventional Coal Power Plantsmentioning

confidence: 99%

Biomass waste co-firing with coal applied to the Sines Thermal Power Plant in Portugal

Nunes

Matias

Catalão

2014

Fuel

View full text Add to dashboard Cite

Environmental issues raised by the use of fossil fuels lead to the search for alternatives that promote the reduction of emissions of greenhouse gases. CO 2 has been identified as being the most important and urgent to control. Co-firing is a technique that allows the simultaneous combustion of different types of fuels, for example coal and biomass, combining the advantages of both. This study characterizes the advantages of the system and the possibilities of using waste biomass as fuel in a coal-fired thermal power plant. For this, co-firing biomass waste, from forestry operations, with bituminous coal was simulated. Then reductions in CO 2 emissions into the atmosphere from Sines Thermal Power Plant in Portugal were calculated, showing a reduction of more than 1,000,000 tons/year of CO 2. Also it was verified that although environmentally advantageous, co-firing is still not economically viable due to the high cost of the residual biomass, combined with its low-energy density and high transportation costs.

show abstract

“…Many scientific researchers have studied the ignition and combustion characters of PF streams using many experimental systems, such as drop tube furnaces (DTFs), but the heating modes in these experiments are different from the mode of PF combustion in the furnace of an actual tangentially fired burner [10][11][12][13][14][15]. Therefore, a pilot-scale experimental system comprising a large-scale pulverized coal-fired furnace was built in the Clean Coal Combustion Laboratory in Harbin Institute of Technology (HIT) to simulate an actual industrial fired furnace.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, a pilot-scale experimental system comprising a large-scale pulverized coal-fired furnace was built in the Clean Coal Combustion Laboratory in Harbin Institute of Technology (HIT) to simulate an actual industrial fired furnace. Compared with DTFs, the miniature pilot-scale experimental system has achieved better experimental results for industrial applications due to the different ignition characteristics achieved with various heating modes [14,15]. The researchers from HIT, Zeng et al [16][17][18] and Zhao et al [19], established a PF test burner in this pilot-scale test furnace, which simulated the ignition and combustion process of a bias PF tangential burner of actual tangentially fired boilers.…”

Section: Introductionmentioning

confidence: 99%

Influence of nozzle height to width ratio on ignition and NOx emission characteristics of semicoke/bituminous coal blends in a 300 kW pulverized coal-fired furnace

et al. 2021

View full text Add to dashboard Cite

To improve the ignition behavior and to reduce the high NO x emissions of blended pulverized fuels (PF) of semicoke (SC), large-scale experiments were conducted in a 300 kW fired furnace at various nozzle settings, i.e., ratios (denoted by h f /b) of the height of the rectangular burner nozzle to its width of 1.65, 2.32, and 3.22. The combustion tests indicate that the flame stability, ignition performance, and fuel burnout ratio were significantly improved at a nozzle setting of h f /b = 2.32. The smaller h f /b delayed ignition and caused the flame to concentrate excessively on the axis of the furnace, while the larger h f /b easily caused the deflection of the pulverized coal flame, and a high-temperature flame zone emerged close to the furnace wall. NO x emissions at the outlet of the primary zone decreased from 447 to 354 mg/m 3 (O 2 = 6%), and the ignition distance decreased from 420 to 246 mm when the h f /b varied from 1.65 to 3.22. Furthermore, the ratio (denoted by S R /S C) of the strong reduction zone area to the combustion reaction zone area was defined experimentally by the CO concentration to evaluate the reduction zone. The S R /S C rose monotonously, but its restraining effects on NO x formation decreased as h f /b increased. The results suggested that in a test furnace, regulating the nozzle h f /b conditions sharply reduces NO x emissions and improves the combustion efficiency of SC blends possessing an appropriate jet rigidity. Keywords rectangular jet burner, nozzle height to width ratio, ignition characteristics, pyrolyzed semicoke (SC) and bituminous blend, NO x formation

show abstract

Ignition characteristics of co-fired mixtures of petroleum coke and bituminous coal in a pilot-scale furnace

Cited by 15 publications

References 10 publications

Effect of the Primary Air Velocity on Ignition Characteristics of Bias Pulverized Coal Jets

Effect of the Primary Air Velocity on Ignition Characteristics of Bias Pulverized Coal Jets

Biomass waste co-firing with coal applied to the Sines Thermal Power Plant in Portugal

Influence of nozzle height to width ratio on ignition and NOx emission characteristics of semicoke/bituminous coal blends in a 300 kW pulverized coal-fired furnace

Contact Info

Product

Resources

About