Particle size-dependent properties of a char produced using a moving-bed pyrolyzer for fueling pulverized coal injection and sintering operations

Zou, Chong; She, Yuan; Shi, Rui

doi:10.1016/j.fuproc.2019.02.026

Cited by 12 publications

(5 citation statements)

References 35 publications

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“…Usually, the percentage of coke in total material consumption is called CR, the percentage of pulverized coal injection in total material consumption is called PCIR. It has been proved that that the PCIR improvement and CR reduction are the most effective energy saving measures in BFIMP [36]. Therefore, the influence factors analysis on PCIR and CR will be carried out in this paper.…”

Section: Pcamentioning

confidence: 99%

An All-Factors Analysis Approach on Energy Consumption for the Blast Furnace Iron Making Process in Iron and Steel industry

et al. 2019

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The blast furnace iron making process (BFIMP) is the key of the integrated steel enterprise for energy saving due to its largest energy consumption proportion. In this paper, an all-factors analysis approach on energy consumption was proposed in BFIMP. Firstly, the BFIMP composition and production data should be collected. Secondly, the material flows and energy flows analysis models could be established based on material balance and the thermal equilibrium. Then, the all influence factors (mainly including material flows, energy flows and operation parameters) on energy consumption were obtained. Thirdly, the main influence factors, which influenced the coke ratio (CR) and the pulverized coal injection ratio (PCIR), were obtained by using the partial correlation analysis (PCA) method, because CR and PCIR were the key energy consumption performance in BFIMP. Furthermore, anall-factors analysis result could be achieved by a multivariate linear model (MLR), which was established through these main influence factors. The case study showed that the PCIR was the most effective parameter on CR; when it was increased by 1% (0.84 kg/t), the CR would reduce by 0.507 kg/t. Therefore, the increase in PCIR consumption is the key measure to realize energy saving for BFIMP. The results showed that the improvement of some material flows, energy flows and operation parameters could increase the amount of PCIR, such as sinter size, ore grade, sinter grade, M10, blast volume, blast temperature and especially for sinter alkalinity. Moreover, theall-factors analysis approach on energy consumption can widely be used in various BFIMPs, too.

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Section: Pcamentioning

confidence: 99%

An All-Factors Analysis Approach on Energy Consumption for the Blast Furnace Iron Making Process in Iron and Steel industry

et al. 2019

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“…Therefore, it is necessary to select a clean and high-quality fuel to reduce the operating costs and control the gaseous pollutants released during the iron ore sintering. Specifically, the fuel is required to have a higher heating value, lower ash yield, and better flammability, and release less-harmful gas …”

Section: Introductionmentioning

confidence: 99%

“…Specifically, the fuel is required to have a higher heating value, lower ash yield, and better flammability, and release less-harmful gas. 1 China has abundant reserves of low-rank coal, and pyrolysis is one of the most effective ways to efficiently utilize low-rank coal and transform it into clean products. 2 The solid product obtained from low-temperature pyrolysis of low-rank noncaking coal is semi-coke, which has the characteristics of high chemical activity, low ash, low aluminum, low sulfur, and low phosphorus, and has been identified as clean energy.…”

Section: Introductionmentioning

confidence: 99%

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Change of the Petrographic Characteristics of Semi-Coke in the Iron Ore Sintering Process

Wang

Fang

et al. 2023

ACS Omega

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This study focuses on the petrographic analysis method to evaluate semi-coke and its combustion behavior in the sintering process, which has been seldom conducted before. Semicokes are different in morphological features, porosity, pore structure, and wall thickness, because of differences in the vitrinite and inertinite of the raw coal. Semi-coke displayed isotropy, and even after the drop tube furnace (DTF) and sintering process, it still retained its optical properties. Eight kinds of sintered ash were observed using reflected light microscopy. Petrographic analyzes for the combustion properties of semi-coke were based on its optical structure, morphological development, and unburned char. The results indicated that microscopic morphology was an important characteristic when trying to understand the behavior and burnout of semi-coke. These characteristics can be used to trace the origin of the unburned char in fly ash. The unburned semi-coke mostly existed in the form of inertoid, mixed dense and mixed porous. Meanwhile, it was found that most of the unburned chars were melted into sinter, resulting in inefficient fuel combustion.

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“…Semicoke is produced in huge quantities as the main solid product of low-temperature pyrolysis of low-rank coal. Although some semicoke is used in ferroalloy smelting, 2 calcium carbide production, 3 boiler power generation, 4 and iron ore sintering fuels, 5,6 large amounts are still available for consumption. During pyrolysis, semicoke mainly undergoes the precipitation of organic components, the depolymerization of macromolecular chains, and the evolutions of the pore structure and chemical structure of microcrystalline carbon.…”

Section: Introductionmentioning

confidence: 99%

Comparison of isothermal and nonisothermal combustion methods when evaluating semicoke for pulverized coal injection of blast furnace

Zou

Zhao

et al. 2022

Asia-Pacific J Chem Eng

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Using semicoke instead of anthracite for pulverized coal injection (PCI) in a blast furnace can greatly reduce the cost of iron making, but the combustion performance of semicoke first needs to be accurately predicted. In this study, the combustion performances of different fuels were compared and analyzed in a drop tube furnace (DTF) and under isothermal and nonisothermal conditions. The results showed that semicoke had a better combustion performance than coal in the DTF. Isothermal combustion provided a more consistent performance evaluation of the fuels because the effect of volatiles was eliminated. Nonisothermal combustion significantly differed from the DTF results because of the influence of volatiles; after the fuels received high‐temperature treatment for devolatilization, the combustion performance was consistent with the DTF results. The influencing factors for the fuel combustion performance differed according to the combustion conditions. For the DTF, the burnout rate was correlated with the pore structure and microcrystalline structure, especially the latter. For isothermal combustion, the combustion characteristic parameter and microcrystalline structure d002 and Lc after high‐temperature treatment were strongly correlated. For nonisothermal combustion, the combustion characteristic parameters were strongly correlated with the volatile content. The above results can serve as a reference for evaluating the combustion performance of different fuels in a blast furnace using PCI.

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Particle size-dependent properties of a char produced using a moving-bed pyrolyzer for fueling pulverized coal injection and sintering operations

Cited by 12 publications

References 35 publications

An All-Factors Analysis Approach on Energy Consumption for the Blast Furnace Iron Making Process in Iron and Steel industry

An All-Factors Analysis Approach on Energy Consumption for the Blast Furnace Iron Making Process in Iron and Steel industry

Change of the Petrographic Characteristics of Semi-Coke in the Iron Ore Sintering Process

Comparison of isothermal and nonisothermal combustion methods when evaluating semicoke for pulverized coal injection of blast furnace

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