Coal is the primary energy source in China, and its life cycle inventory (LCI) is widely used as background data for life cycle assessment studies. Previous research indicates that the inventory of coal production varies regionally. However, the development of complete regionalized LCIs for coal production is quite limited. Here, we establish the first provinciallevel LCIs of local coal ...
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July 2019 Previous Article Next Article ResearchArticle Simultaneous Extraction of Clean Coal and Rare Earth Elements From Coal Tailings Using AlkaliAcid Leaching Process Vinoth Kumar Kuppusamy, Amit Kumar, Maria Holuszko Author and Article Information J. Energy Resour. Technol. Jul 2019, 141 (7): 070708 (7 pages)
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Fully mechanized mining (FMM) technology has been applied in Chinese coal mines for more than 40 years. At present, the output of a FMM face has reached 10million tons with Chinesemade equipment. In this study, the new developments in FMM technology and equipment in Chinese coal mines during past decades are introduced. The automatic FMM technology for thin seams, complete sets of FMM ...
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Coal gasification in supercritical water is a typical carbonbased fuel conversion process in water phase, and it takes the advantages of the unique chemical and physical properties of supercritical water to convert organic matter in coal to H2 and CO2. N, S, P, Hg and other elements are deposited as inorganic salts to avoid pollution emission.
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1. Introduction. Lowrank coal catalytic microwave pyrolysis has attracted considerable attention among researchers to improve the yields and quality of pyrolysis products and considerably reduce the energy efficiency of pyrolysis reaction [1], [2], [3], [4].In general, the key to efficient chemical processes is the control of the rates of reaction, which is usually provided by a catalyst that ...
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In this study, coal fly ash was functionalized, using a simple onestep process (loading with Al3+ and sulfonation), to yield a solid acid catalyst (S/AlCFA) with strong acid sites. The catalyst was then used to produce furfural from xylose in a biphasic system (H2O(NaCl)/tetrahydrofuran). The furfural yield reached 82% at 180 °C60 min with catalyst/xylose ratio of : (w/w). With the ...
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In addition to the importance of pyrolysis in coal processing, analysis of pyrolysis products can supply important clues to the structure of the parent coal, especially since many of its structural elements are preserved in the heavy volatile products (tar). Keywords Furnace Temperature Coal Particle Bituminous Coal
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While coal is currently mined in 25 states, the main sources of US coal are highly concentrated. In 2016, almost 58 percent of all the coal produced in the United States came from just three states—Kentucky, West ia, and Wyoming—with each contributing 6, 11, and 40 percent of US coal production, respectively .
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In addition, the coal to methanol (CtM) process and the CtSNG process have several identical units (, air separation, coal gasification, water gas shift, and acid gas removal) (Wen et al., 2016). Accordingly, choosing methanol as the coproduction chemical requires the least process adjustment and investment (Liu et al., 2019).
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A heat integration optimization method that considers the changes in process parameters is proposed to find the global optimal process scheme for a coal chemical company's phenols and ammonia recovery process. The phenols and ammonia recovery process is simulated by Aspen Plus, and a programming method for heat exchanger networks synthesis that can simultaneously optimize process parameters ...
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In this work, to efficiently utilize waste fruit and lowrank coal for the hydrogen (H 2)rich syngas production, steam cogasification of banana peel (BP) and brown coal (BC) was studied in a fixedbed results showed that the gasification rate of BC was highly enhanced after mixing it with BP and the obvious synergistic effect was observed in all investigated three mixing weight ...
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In this work, the economic and environmental impact of integrating nuclear energy into a coalandgastoliquids process has been investigated. Reductions in CO 2 emissions are possible because certain synergies can be exploited when coal, natural gas, and nuclear heat are used in combination, giving efficiency advantages which are unavailable ...
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processes used in coal‐to‐SNG. The proven and commercialized method of gasification for the coal‐to‐ SNG process, however, is the steam‐oxygen gasification process. Steam‐oxygen gasification In the steam‐oxygen process of converting coal to SNG, coal is
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China has the largest coal production in the world due to abundant resource requirements for economic development. In recent years, the proportion of opencast coal mine production has increased significantly in China. Opencast coal mining can lead to a large number of environmental problems, including air pollution, water pollution, and solid waste occupation. The previous studies on the ...
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Metrics. Oxyfuel combustion makes it possible to implement the scenario of Carbon Capture and Storage (CCS) to significantly reduce CO2 emissions without using sorption processes after combustion. This technology can be used to create new power plants and retrofit existing boilers. The amount and composition of flue gases in an oxyfuel boiler ...
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Introduction. Underground coal gasification (UCG) is the process of converting hydrocarbon materials into synthesis gas insitu. Underground coal gasification is sometimes referred to as insitu coal gasification (ISCG). The process has been developed over more than a century, though only a few projects currently operate on a continuous basis.
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According to the accurate model, the simulation for ZLD of fixedbed coal gasification wastewater treatment process is established, and this process is assessed from the perspective of thermodynamics, economy, and environment. The total energy consumption of ZLD process before optimization is × 10 8 W. The results of exergy analysis show ...
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Th e process of converting coal into electricity has multiple steps and is similar to the process used to convert oil and natural gas into electricity: 1. A machine called a pulverizer grinds the coal into a fi ne powder. 2. Th e coal powder mixes with hot air, which helps the coal burn more effi ciently, and the mixture moves to the furnace. 3.
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As shown in Figure 1, domestic coal production and consumption volumes had been high from 2011 to 2020, with figures of 3,902 million tons (Mt) and 4,040 Mt in 2020, respectively. In addition, China also imported a considerable amount of coal to meet its domestic demand. Such a figure reached 303 Mt in 2020.
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Thermal plasmaassisted processing is an effective process for the synthesis of gas (CO and H2) and carbonaceous materials production from industrial waste. In this paper, a DC plasma torch designed with two vortices chambers has been developed, and its characteristics have been experimentally tested. The plasma torch operates with different plasma working gases, including steam. The results ...
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Figure 8: Process of Coal Particle Suspension. 3. Fluidized Bed . Combustion. Advantages: ... • Waste products are captured and recycled in scrubbers and can be used to produce secondary .
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The cogasification behavior and synergistic effect of petroleum coke, biomass, and their blends were studied by thermogravimetric analysis under CO2 atmosphere at different heating rates. The isoconversional method was used to calculate the activation energy. The results showed that the gasification process occurred in two stages: pyrolysis and char gasification. A synergistic effect was ...
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Liquidphase methanol carbonylation is currently a main commercially viable process developed by BASF Corp. for the industrial production of methyl formate. Recently, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences has developed a new synthesis method to convert coal to methyl formate (denoted as CTMF).
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Resource Demands of Coal Production. In Environmental Impacts of Coal Mining Utilization, 1987. A Waterconscious Future. Having estimated the quantity and location of future coal production and processing, and the methods by which this coal will be extracted, transported and processed, Alcamo (1984) computed the industry's water requirements. He assumed a "waterconscious" future in ...
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Abstract. This work presents the combustion characteristics of coal, petroleum coke (PC), rice straw (RS), mustard cake (MC), and their blends to assess the applicability of blended fuel for thermal power generation. Characterization results show that PC has the highest gross calorific value (GCV) (35,990 kJ/kg) to improve the overall energy density of the blend significantly. Higher volatile ...
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Silica aerogel materials are well recognized for their superinsulation performance and are regarded as one of the hot candidates to revolutionize building insulation. To date, high production cost related to exorbitant precursors as well as cumbrous multistep hydrophobization process has often narrowed the field of applications. In this work, granular silica aerogel materials were synthesized ...
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G. Steenbruggen and Hollman, The synthesis of zeolites from fly ash and the properties of the zeolite products, J. Geochem. Explor., 62 (1998), No. 13, p. 305. H. Tanaka, Y. Sakai, and R. Hino, Formation of Na—A and —X zeolites from waste solutions in conversion of coal fly ash to zeolites, Mater. Res.
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Carbon capture and storage (CCS) represents a key solution to control the global warming reducing carbon dioxide emissions from coalfired power plants. This study reports a comparative performance assessment of different power generation technologies, including ultrasupercritical (USC) pulverized coal combustion plant with postcombustion CO2 capture, integrated gasification combined cycle ...
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يرغب أحد موردي المواد من بلجيكا في إنتاج مسحوق الحجر الجيري لملابسه...
الهند غنية بالموارد المعدنية المختلفة وهي سوق مهم لمعالجة المعادن
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