Combustion characteristics and kinetic analysis of co-combustion between bag dust and pulverized coal

Xu, Tao; Ning, Xiaojun; Wang, Guangwei; Wang, Liang; Zhang, Jianliang; Li, Yanjiang; Wang, Haiyang; Jiang, Chunhe

doi:10.1007/s12613-018-1695-3

Cited by 19 publications

(6 citation statements)

References 22 publications

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“…The coke-packed bed process is a melting-reduction process developed by Kawasaki Steel Corp, which is used to recover zinc and iron from EAF dust [35,[43][44][45]. Figure 11 is the flow chart of the coke-packed bed process.…”

Section: Coke-packed Bed Processmentioning

confidence: 99%

Recovery of Zinc and Iron from Steel Mill Dust—An Overview of Available Technologies

et al. 2022

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The global shortage of zinc mines makes the extraction of zinc from zinc-containing wastes a hot research topic. Most kinds of steel mill dust (SMD) cannot be directly returned to the ironmaking and steelmaking processes due to their zinc content. A large amount of SMD produced during steelmaking has become a major challenge for steel plants due to environmental pollution, health issues and land scarcity. Lots of processes for recovering metals from SMD have been developed to comprehensively utilize them and solve these environmental problems. Zinc in SMD can be recovered by these technologies, and the residue can be used as raw material for ironmaking. In this work, the sources and characteristics of SMD from different processes were analyzed firstly. Then, the mechanisms of physical, hydrometallurgical, pyrometallurgical and pyrometallurgy–hydrometallurgy combined processes for SMD disposal are presented, and these methods are compared in terms of energy consumption, process complexity and industrial application. Finally, suggestions and prospects for utilization of SMD are put forward.

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Section: Coke-packed Bed Processmentioning

confidence: 99%

Recovery of Zinc and Iron from Steel Mill Dust—An Overview of Available Technologies

et al. 2022

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“…By changing the pyrolysis conditions, products with different compositions and properties can be obtained; after pyrolysis pretreatment, the properties of biomass char can be improved, and the calorific value and grindability can meet the requirements of blast furnace injection fuel. Therefore, pyrolysis plays an important role in improving the fuel characteristics of biomass and reducing transportation and storage costs …”

Section: Introductionmentioning

confidence: 99%

“…Therefore, pyrolysis plays an important role in improving the fuel characteristics of biomass and reducing transportation and storage costs. 10 In recent years, a lot of research has carried out on the application of pyrolysis biomass char in blast furnace injection. 11 Yousaf et al 12 studied the combustion characteristics of biomass char obtained from the pyrolysis of peanut shell and wheat stalk at 300, 500, and 700 °C and found that when the mass ratio of biomass char was 50%, the blends mixed with pulverized coal had the highest combustion efficiency.…”

Section: Introductionmentioning

confidence: 99%

Comprehensive Study on the Feasibility of Pyrolysis Biomass Char Applied to Blast Furnace Injection and Tuyere Simulation Combustion

Dang

Wang

et al. 2021

ACS Omega

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Basic property analysis is the most comprehensive evaluation of metallurgical characteristics of blast furnace injection fuel. In this study, the basic properties of 16 types of pyrolysis biomass char samples were comprehensively investigated; the results showed that components harmful to a blast furnace, such as the ash content and alkali metal content of Jiangsu Suzhou woodblock char (B3), Jiangsu Changzhou branch char (B8), Jiangsu Zhangjiagang bamboo char (B10), and Jiangsu Zhangjiagang coconut shell char (B12) in all of the biomass char samples, are lower and close to the level of blast furnace injection bituminous coal. The grindability, particle size distribution, and safety all met the requirements of the blast furnace. Among them, the ash melting characteristic temperature of B3, B8, Jiangsu Zhangjiagang rice husk char (B11), and Shanghai soil remediation agent (B16) was greater than 1250 °C, indicating that they are not easy to block the blast furnace raceway and spray guns. Most of the biomass char samples had good combustibility, and the burnout temperature was less than 700 °C. A self-developed blast furnace injection combustion simulation experimental device was used to simulate the combustion behavior of biomass char in the blast furnace raceway tuyere, and the burnout rates of 16 biomass chars were measured. The results showed that that the burnout rate is related to both the volatiles and fixed carbon and the influence of volatiles on the burnout rate is greater than that of fixed carbon. The burnout rates of B3 and B8 were 77.12 and 67.03%, respectively. Above all, B3 and B8 showed good properties, but the burnout rate of B3 was higher, so B3 had the feasibility of applying to blast furnace injection, which indicates that woodblock char has the potential to be used as blast furnace injection fuel.

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“…The temperature‐programmed oxidation, differential scanning calorimetry and TG/DSC‐FTIR coupling technology are often used to investigate the evolutions of coal mass, heat and gaseous products during coal spontaneous combustion 23‐25 . In addition, activation energy is an important indicator for evaluating coal combustion reaction performance 26 . Various functional groups measured by FTIR reflect the micro‐characteristics of coal 27,28 …”

Section: Introductionmentioning

confidence: 99%

“…[23][24][25] In addition, activation energy is an important indicator for evaluating coal combustion reaction performance. 26 Various functional groups measured by FTIR reflect the micro-characteristics of coal. 27,28 In view of the drawback exposed by these inhibitors, a new inhibitor with fast oxygen consumption and inhibitory effect has been developed on the basis of inorganic salt inhibitors.…”

Section: Introductionmentioning

confidence: 99%

Investigation on the suppression characteristic of deoxidization gel foam on coal spontaneous combustion

Xue

Wang

et al. 2021

Fire and Materials

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Summary Mine fire caused by coal spontaneous combustion is one of the main safety problems in mining. For the purpose of developing a more effective inhibitor to suppress the coal spontaneous combustion, a compound deoxidization gel foam inhibitor was proposed by combining sodium dithionite deoxidizer with gel foam. An experimental platform was self‐built to evaluate the suppression characteristic of deoxidization gel foam. Experimental results showed that the deoxidization gel foam reduced the oxygen concentration to below 14% within 180 minutes. STA‐FTIR test indicated that the deoxidization gel foam raised the active temperature from 250.57°C to 275.18°C and reduced CO2 absorption peak from 0.2926 to 0.2201 at the reaction temperature 20°C. The activation energy was also increased from 85.69 to 95.59 kJ·mol−1 in thermal decomposition combustion that exhibited an excellent flame‐retardant efficacy on the coal, especially at the low temperature stage. CH3 and CH2 were reduced by 56.86% and 47.17% processed by deoxidization gel foam. Meanwhile, the significant reduction in the content of reductive functional groups indicated that the new inhibitor had a strong suppression capacity for coal spontaneous combustion. Based on above research, it is believed that this study will lay an important foundation in the widespread application of deoxidization gel foam technology for coal spontaneous combustion prevention in underground mines.

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Combustion characteristics and kinetic analysis of co-combustion between bag dust and pulverized coal

Cited by 19 publications

References 22 publications

Recovery of Zinc and Iron from Steel Mill Dust—An Overview of Available Technologies

Recovery of Zinc and Iron from Steel Mill Dust—An Overview of Available Technologies

Comprehensive Study on the Feasibility of Pyrolysis Biomass Char Applied to Blast Furnace Injection and Tuyere Simulation Combustion

Investigation on the suppression characteristic of deoxidization gel foam on coal spontaneous combustion

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