Influence of steel industrial wastes on burnout rate and NOx release during the pulverized coal catalytic combustion

Han

et al. 2015

Aerosol Air Qual. Res.

Effects of adding waste iron residue on the combustion efficiency and the removal of Polycyclic Aromatic Hydrocarbons (PAHs) during coal combustion were investigated in a laboratory scaled drop tube furnace at a temperature range of 950-1250°C. The experimental results indicated that adding 0.5% waste iron residue had a good performance on enhancing combustion efficiency during coal combustion. Meanwhile, the addition of 0.5% waste iron residue was also favor for reducing PAHs emission as well as PAHs TEQ concentrations during coal combustion at a temperatures range of 950-1250°C. With adding 0.5% waste iron residue (WIR), the coal combustion efficiency was enhanced by 6.15%, and the total PAHs concentration in flue gas was decreased by 44.94% at 1150°C. The maximum removal of the total PAHs TEQ concentration was as high as 45.24% at 1250°C.

Section: Introductionmentioning

confidence: 90%

Section: Experimental Apparatusmentioning

confidence: 99%

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Influences of Waste Iron Residue on Combustion Efficiency and Polycyclic Aromatic Hydrocarbons Release during Coal Catalytic Combustion

Qin

Han

et al. 2015

Aerosol Air Qual. Res.

“…But in the coming decades, fossil fuels will continue to provide more than 85% of global energy consumption. Compared with oil and natural gas, the attraction of coal lies in its abundant reserves and stable prices . Therefore, the efficient use of coal is increasingly paramount to the sustainable development of the world economy and society.…”

Section: Introductionmentioning

confidence: 99%

Effect of coal blending on ash fusion behavior for blast furnace injection of high calcium bituminous coal

Energy Science & Engineering

Wang

et al. 2019

In order to expand the range of bituminous coal injected into blast furnace, the ash melting behavior and regulation mechanism of bituminous with high calcium and low ash fusion temperature (AFT) were investigated by coal blending. And the mineral transformation behavior in the blended ashes was investigated by X-ray powder diffractometry with normalized reference intensity ratio software and FactSage software. The experimental results manifest that the softening temperature (ST) of coal D is 8°C lower than that of the hot blast temperature. By adequately mixing coal B and coal D, it is easy to meet the requirements of pulverized coal injection.And coal D has become a standard bituminous for blast furnace injection. However, the high content of CaO in the coal S ash makes the AFT much lower than the hot blast temperature, which leads to the reluctance of the steel industry to inject coal S.With the increase of coal B mass ratio, the content of high-melting eutectic matters (3Al 2 O 3 ·2SiO 2 and tridymite) increases at high temperature, while the content of low-melting anorthite, andradite, gehlenite, and grossularite decreases, which leads to the increase of AFTs. The variation in the liquid phase under certain conditions reflects the change in AFT. In summary, by blending with coal B, the ST of blended coals S/B is higher than the hot blast temperature (1250°C), so that coal S can be applied to blast furnace injection. And the injection ratio of coal S in blended coals can reach about 50%. K E Y W O R D Sash fusion behavior, coal blending, high calcium bituminous, mineral transformation, thermal properties How to cite this article: Li Y, Zhang J, Wang G, Qiao J, Wang P, Liang W. Effect of coal blending on ash fusion behavior for blast furnace injection of high calcium bituminous coal. Energy Sci Eng.

“…Then, some investigators used industrial wastes coal as coal burning additives. Zhou and Li [9] and Wu et al [10] found industrial wastes could promote the coal combustion, but the efficiency was less than chemical reagents. Though the investigators had made great achievements in coal burning additives, these findings were almost used in the boilers and the electricity generation.…”

Section: Introductionmentioning

confidence: 99%

Influence of Environmentally Friendly and High-Efficiency Composite Additives on Pulverized Coal Combustion in Cement Industry

Wang

et al. 2016

Journal of Combustion

4 kinds of chemical reagents and 3 kinds of industrial wastes were selected as burning additives for 2 kinds of coals in cement industry. The work focused on the replacement of partial chemical reagents by industrial wastes, which not only reduced the cost and took full advantage of industrial wastes, but also guaranteed the high combustion efficiency and removed theNOXand SO2simultaneously. The experiments were carried out in DTF. The combustion residues were analyzed by SEM and XRD. The results showed that the burnout rate was increased after adding the additives; meanwhile, theNOXand SO2release concentration were reduced, but the degree of action varied for different additives and coals. The substitute of chemical reagents by industrial wastes was very effective; overall, the cold-rolled iron oxide worked better than others; the particles surface was tougher and the peaks of crystalline phase were lower than raw coal, which indicated that the additives played good roles in combustion process.