Analysis of Coal Gangue Pollution Control Technology

Liu, Yan Guang; Li, Yu; Zhou, Ai Guo

doi:10.4028/www.scientific.net/amr.683.941

Cited by 4 publications

(4 citation statements)

References 3 publications

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“…The accumulation of CG not only squanders valuable land resources but also endangers the environment by causing soil pollution, air pollution and geological disasters. CG is a low-carbon mixture composed of assorted minerals and rocks that is typi ed by low volatile content, high ash content, a challenging nature for combustion and a low calori c value [10][11][12]. The main applications in China at present encompass recycling, wastewater management, building materials, farming, re lling land, and as a fuel for power production [13].…”

Section: Introductionmentioning

confidence: 99%

Study on the co-combustion behavior of rice straw with coal gangue and fixation of alkali metals and ash melting characteristics

Jia,

Zhang,

Yun

et al. 2024

Preprint

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Because it is clean, low carbon, and renewable, biomass offers the greatest practical value. Nevertheless, during combustion, issues like slagging, agglomeration, and corrosion can occur due to the high concentration of Cl and alkali metals (K and Na), which lowers combustion efficiency. On the other hand, gangue (CG), when combined with biomass as an additive, can successfully prevent slagging during the burning process. However, more research is needed to determine how CG affects the properties of ash melting, alkali metal immobilization, and biomass combustion behavior. Thus, the impacts of CG on the co-combustion behavior, fugitive forms of alkali metals, and ash melting properties of rice straw (RS) were examined in this article. X-ray diffraction analysis, scanning electron microscopy, thermogravimetric-differential thermal analysis, ash melting temperature test, and tube furnace combustion studies were among the experimental techniques utilized to characterize the ash. The findings demonstrated that adding CG to biomass might enhance both the overall combustion performance and the flammability index, with notable synergistic effects connected to the ratio of biomass to CG. Alkali metals in the ash could be efficiently fixed by CG, and it was found that adding 20% of CG to the biomass had the best results. The degree of ash melt slagging was successfully reduced and controlled with a rise in the CG addition ratio, and silica-aluminate with a higher melting point and stable nature was produced, which could effectively raise the biomass's ash melting temperature.

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Section: Introductionmentioning

confidence: 99%

Study on the co-combustion behavior of rice straw with coal gangue and fixation of alkali metals and ash melting characteristics

Jia,

Zhang,

Yun

et al. 2024

Preprint

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“…It is estimated that China has more than 5000 coal gangue dumps, of which approximately 1700 have combusted spontaneously, covering an area of about 1500 km 2 . , Coal gangue dumps are prone to spontaneous combustion due to their high contents of sulfur and carbon. The resultant dust and toxic gases such as SO 2 , H 2 S, CO, and NO x would lead to serious pollution to the atmospheric environment of mining areas. − Besides, acidic water and toxic elements such as Cu, Cr, As, and Pb formed by weathering and long-term eluviation would pollute the soil and water. ,− In addition, as a result of coal gangue spontaneous combustion, geological disasters such as collapse, landslide, debris flow, and explosion are likely to occur under high-temperature and high-pressure conditions inside the dumps, endangering the life of residents around mining areas and causing serious damage to the ecological environment. − In recent years, research on coal gangue worldwide mainly involves spontaneous combustion characteristics, detection of fire areas, and fire prevention and extinguishing materials.…”

Section: Introductionmentioning

confidence: 99%

“…It is estimated that China has more than 5000 coal gangue dumps, of which approximately 1700 have combusted spontaneously, covering an area of about 1500 km 2 . 3 , 4 Coal gangue dumps are prone to spontaneous combustion due to their high contents of sulfur and carbon. The resultant dust and toxic gases such as SO 2 , H 2 S, CO, and NO x would lead to serious pollution to the atmospheric environment of mining areas.…”

Section: Introductionmentioning

confidence: 99%

Detection of Spontaneous Combustion Areas of Coal Gangue Dumps and Comprehensive Governance Technologies: A Case Study

Liu,

Qi,

Luo

et al. 2023

ACS Omega

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Spontaneous combustion of coal gangue dumps not only releases toxic and harmful gases, polluting the environment, but also leads to explosion accidents and casualties due to improper handling. This paper focuses on delineating the fire area, constructing a comprehensive fire prevention and extinguishing system, and restoring the ecological environment. Infrared thermal imaging was used to detect the shallow fire area, while intensive drilling was conducted to detect the deep fire area. The stability of the coal gangue dump was enhanced by perfusing three-phase foam for cooling and using a curing material to fill the cracks. Land reclamation was then performed to restore the ecological environment. The results indicate that spontaneous combustion of coal gangue dumps can trigger the spread of the fire area from the outside to the inside, gradually expanding due to the ‘stack effect’. The sources of spontaneous combustion in gangue fire areas are mainly located 3–5 m below the flat surface, and the shallow and deep fire areas are interconnected, posing a significant danger. These research findings can serve as a reference for detecting fire areas in coal gangue dumps and controlling environmental pollution.

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“…Coal gangue hills are formed from waste materials generated during coal mining and they contain a large amount of heavy metals and other harmful substances [1][2][3][4]. The internal elements such as carbon, sulfur, and nitrogen can generate a significant amount of hazardous gases after oxidation, leading to environmental pollution [5][6][7][8][9][10]. The remaining coal inside these hills can release a substantial amount of heat through slow atmospheric oxidation, resulting in high temperatures within the gangue hills.…”

Section: Introductionmentioning

confidence: 99%

Optimization of the Parameters for Gravity Heat Pipes in Coal Gangue Hills by Measuring Thermal Power Generation

Zhang,

et al. 2023

Processes

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In order to effectively control high temperatures inside coal gangue hills, gravity heat pipes with specific spacings are vertically installed in coal gangue hills. Heat extracted from these heat pipes can be utilized for power generation through energy conversion. In this study, an equivalent model of gravity heat pipes in coal gangue hills was established and, in a laboratory setting, experimental research and optimization were conducted on power generation per unit area using the temperature difference of gravity heat pipes for electricity generation. To facilitate real-time testing of different heat pipe parameters and to display the experimental results, a multi-parameter measurement system was designed and constructed. This study systematically investigated the effects of various structural parameters such as inclination angle, heating temperature, initial absolute pressure, and working fluid height. Through single-factor experiments, it was determined that the inclination angle had no significant impact. The range of values for heating temperature, initial absolute pressure, and working fluid height were confirmed based on six sets of experiments. To maximize the performance of the thermoelectric generator, a response surface analysis experiment was conducted using the Design-Expert software. The optimal conditions were determined to be a working fluid height of 200.001 mm, an initial absolute pressure of 0.002 MPa, and a heating temperature of 413.15 K. Under these conditions, the power generation per unit area of the thermoelectric generator reached 0.122981 W/(m2·K). The accuracy of the theoretical experiments was verified through on-site industrial experiments. By calculations, it was determined that the maximum temperature difference power generation capacity per gravity heat pipe was 42.39 W. This provides a new solution for the management of coal mine gangue hills and the secondary utilization of waste energy.

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Analysis of Coal Gangue Pollution Control Technology

Cited by 4 publications

References 3 publications

Study on the co-combustion behavior of rice straw with coal gangue and fixation of alkali metals and ash melting characteristics

Study on the co-combustion behavior of rice straw with coal gangue and fixation of alkali metals and ash melting characteristics

Detection of Spontaneous Combustion Areas of Coal Gangue Dumps and Comprehensive Governance Technologies: A Case Study

Optimization of the Parameters for Gravity Heat Pipes in Coal Gangue Hills by Measuring Thermal Power Generation

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