Proximate and ultimate analysis results of low-rank coal samples with the 0.500–0.250 mm size fraction are shown in Table 1, where Mad is the moisture content, Vad the volatile matter content, FCad the fixed carbon content, Aad the ash content, and C daf, H daf, O daf, N daf, and S daf are the contents of carbon, hydrogen, oxygen, …
Theoretically, the mass flow of coal can be more uniform by increasing the coal fineness (i.e. decreasing coal particulate size). This is because finer coal particles have a lower …
1. Introduction. With the increasing interest in coalbed CO 2 sequestration and CO 2-ECBM, it is important to assess the reservoir and geomechanical aspects of storage operations.Many efforts have been dedicated to investigate the reservoir properties of coal (Busch and Gensterblum, 2011, Moore, 2012), but only a few studies have been …
Coal and gas outburst disasters in coal seams are becoming more serious as coal mines extend deeper underground in China. Damage evolution has affected gas flow in coal seam greatly, which also controls gas permeation and gas extraction results, and finally, it has tremendous influence on prevention and control of gas disaster accidents. …
Effect of energy consumption on dispersion and recovery of coal slimes in a mechanical flotation cell. ... Dispersion characteristics and flotation recovery of different size coal slimes affected by the impeller stirring speed or effective power in a mechanical flotation cell were investigated. The effective power increased as the impeller ...
It is well known that coal is oxidized during production under atmospheric conditions. Owing to its native floatability, coal floats easily with froth flotation compared to other minerals. ... the rate and recovery of the smaller size fractions were enhanced considerably. The beneficial effects of preconditioning on the batch flotation of ...
Coal particle separation in a classifier after the pulverization process in power plants (PP) is very important to obtain the desired level of coal fineness while reducing …
58 / The Energy Journal ll rihts reserved. opriht 2020 b the IEE. titative estimates of their importance.1 In contrast, our paper provides quantitative estimates of the importance of these factors on coal consumption by all coal-fired electricity generators, rather than focusing more narrowly on coal-fired electricity generation capacity. Like us, Houser, …
To normalize the costs associated with fuel, FOB prices were taken, so the total costs were compared on same basis. Table 2 presents the costs of six different coal grades presented by S&P Global Platts [34].These were associated with the six compositions presented in Table 1.In addition to the different price classifications (FOB, …
Coalbed methane (CBM) is mainly adsorbed in coal reservoir. To explore the methane (CH 4) adsorption mechanism in coal, this paper investigated the relationships among CH 4 adsorption characteristics and microstructure and chemical composition of the coal samples through different solvent treatments. The results indicate that after THF …
Abstract. CO 2 emissions from coal power generation could be reduced by maximizing the amount of torrefied biomass that can be used in pulverized-coal-fired power plants. In this study, to evaluate the …
Effect of Ultrasonic Pre-treatment Time on Coal Flotation Prasad Kopparthi Research and Development, Tata Steel Limited, Jamshedpur, India Correspondence prasadkopparthi@tatasteel S. Balamurugan Research and Development, Tata Steel Limited, Jamshedpur, India
With a series of global problems such as greenhouse effect caused by the gradual increase of atmospheric CO 2 concentration, CO 2 geological storage has become one of the effective measures. To study the influence of the interaction between CO 2 and coal on the molecular structure characteristics of coal, three coals of different ranks …
In the underground tunnels, caverns or bord-and-pillar goaf, the initial damage usually occurs in the surrounding rock or in coal when mining starts. Under the frequent influence of mining stress, mechanical properties of the surrounding coal rock with initial damage, especially the long-term creep performance, are related to the safety and …
Pyrite has a significant effect on the spontaneous combustion of coal. The presence of pyrite can change the propensity of coal towards spontaneous combustion. The influences of various pyrite contents on the parameters of spontaneous combustion, such as index gases, temperature and released heat etc., were investigated …
2.1 Sample Preparation. Wulong Colliery, comprising minable coal seams found in the third member of the Shahai and Fuxin formations of the Cretaceous Period, numbering 10 coal-seam formations in total, is located in the middle of Fuxin Coalfield, Liaoning Province, China, covering an area of 11.76 km 2, and has a monoclinic structure, a strike N …
The effects of ionic surfactants on coal-water interfacial interactions and on the mobility of water molecules were studied analytically by molecular dynamics simulations (MD) for different systems. The …
As shown in Fig. 2, the one-dimensional flame furnace combustion test bench consists of the following parts: ammonia supply and control system, forced draft fan, pulverized coal feeder, pulverized coal burner, furnace, induced draft fan, bag filter, etc.The furnace has an effective height of 3 m and inner diameter of 175 mm. The overall shape …
The targeted coal selected in this study were taken from Simengou colliery in Yulin City, Shaanxi Province, China. The coal sample belongs to long-flame coal, of which the proximate analysis is displayed in Table 1, a high CSC tendency of the experimental coal sample can be found according to the table. Fig. 1. presents the preparation …
The mining industry, especially coal mining, may severely affect the spatial and temporal evolution of groundwater. To provide a potential model outlining the hydrogeochemical evolution of groundwater as influenced by coal mining, a multi-layer groundwater system in a coal mining area was investigated. A total of 76 groundwater …
Coal plays an important role in the energy structure of China, which supporting the development of various industries (Wang 2006).However, the coal mining is extremely harmful to surface buildings and ecological environment, especially in the case of extra-thick coal seam (viz. coal seam with thickness greater than 8.0 m).
Sedimentation of coal slime water (CSW) is an important process in coal processing plants. However, CSW is difficult to settle because of its high content of clay minerals and fine particles. In this paper, the effect of magnetization pretreatment on CSW flocculating sedimentation is investigated.
Coal-based graphite is the end prod... Carbon materials, graphite resources and graphitization processes have been of considerable interest to the energy field in recent years (Rantitsch et al. 2016). ... The effects of deformation on the macromolecular structure of low/high rank coals are different from coal-based graphite. These differences ...
Pulverized coal fineness (PCF) is a key parameter in coal-fired power plants, demanding accurate and on-line monitoring. This study presents on-line measurement …
The test fuel was Newlands bituminous coal. Its properties are shown in Table 1, and it originally contains 2.2% moisture.To investigate the effects of the moisture in the coal, Kimoto et al. [1] imitatively increased the moisture content by injecting the steam generated by a steam-generation apparatus into the primary air. It should be …
Effects of nanobubbles on fine coal column flotation and underlying mechanisms have been investigated under different operating parameters including frother dosage, collector dosage, feed flow rate, air flow rate and wash water flow rate with a Chinese sub-bituminous coal sample. Experimental results show that the use of …
With the rapid development of Carbon Capture, Utilization and Storage (CCUS) technology, it is necessary to explore the feasibility of coal slime as a porous carbon material for CO 2 capture. In this paper, scanning electron microscopy (SEM) was used to observe the morphological characteristics of coal slime samples with different …
Four coal dust diameters (D 50 = 14.41 μm, 35.59 μm, 76.66 μm and 141.40 μm) and four coal dust concentrations (q = 100 g/m 3, 200 g/m 3, 300 g/m 3 and 400 g/m 3) were adopted in the experiments.The rupture pressure of film (P stat) was 0.32 MPa and the injection pressure of coal dust (P st) was 0.40 MPa [34, 37].The explosion …
Beside the coal mass flow, the particle fineness has a significant impact on the combustion process inside a boiler. It influences ignition delay, combustion efficiency and LoI, the …
Coal blocks were selected from the Hongqinghe Coal Mine (Inner Mongolia, China), with an average buried depth of 718.6 m and the density ρ of 1.33 × 10 3 kg·m −3. As shown in Fig. 1, the coal compositions contain organic matter, granular siderite and kaolinite. Besides, there are some disordered cracks in coal.
generation of quality and consistent electric power output. Coal's mineralogical content and its physical parameters decide the performance of the coal pulverizer in terms of …
In this article, the effect of weathering on coal quality is discussed. Two Indian coals were kept for a period of 2 months, and different coal properties such as free swelling index (FSI), ash ...
In the United States, coal accounts for roughly one-quarter of all energy-related carbon emissions. 2. Air Pollution. Air pollution from coal-fired power plants is linked with asthma, cancer, heart and lung ailments, neurological problems, and other severe environmental and public health impacts.. When coal is burned, it releases several airborne toxins and …
Abstract - Most efficient way of utilizing coal for steam generation is to burn it in pulverised form. The coal is pulverised to fineness such that 70-80% passes through a 200 Mesh …
As exhibited in Fig. 2, the sampling positions were arranged 5 m, 20 m, 50 m, 100 m, and 200 m away from the fault, respectively, so as to grasp the influence scope of the fault on coal seams and the effect of the fault on the coal pore structure and gas sorption characteristics. The fault investigated in this study is a normal fault.
This work investigates the effects of two kinds of iron ore on the pyrolysis characteristics of a low-rank bituminous coal from Hami, China. The pyrolysis and its product distribution were studied using a thermogravimetric analyzer and a fixed bed reactor. A gas chromatograph and a gas chromatograph–mass spectrometer were …
Coal ash, also referred to as coal combustion residuals or CCRs, is produced primarily from the burning of coal in coal-fired power plants. Coal ash includes a number of by-products produced from burning coal, including: Fly ash, a very fine, powdery material composed mostly of silica made from the burning of finely ground coal in a boiler.
Bursting liability is the fundamental attribute of the coal, which is a comprehensive reflection of physical properties such as the infrared thermal effect of coal failure. The infrared thermal effect of coal failure is mainly caused by friction, extrusion, crack propagation between particles inside the coal, and its mechanism is mainly ...
Liquid nitrogen (LN2) fracturing, an effective method in stimulating reservoirs, contains freezing and thawing. In general, frozen rocks are air-thawed in past studies. Microwave fracturing not only enhances pore structures but also removes pore water. To investigate the influence of the thawing process, microwave irradiation is used …
This paper examines the influence of sorbed gas type and pressure on the strength of coal. Particular attention is focused on the influence of gas type and pressures on drillability characteristics of coal and particle size distribution of drill cuttings. Drillability of coal has a strong bearing on the strength properties of coal. Based on fracture mechanics and …
