A Novel Chemical−Electrochemical Hydrogen Production from Coal Slurry by a TwoStep Process: Oxidation of Coal by Ferric Ions and Electroreduction of Hydrogen Ions Niyi Olukayode, Weijing Yang, Kang Xiang, Shenrong Ye, Zhigang Sun, Zhenfei Han, and Sheng Sui* ... the production of hydrogen during water electrolysis to a value as low as V ...
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Hence, there is a consideration of substituting the anodic electrolysis of water with the anodic electrochemical oxidation of coalwater slurry (CWS). By doing so, the theoretical voltage of the overall reaction can be reduced from the original V to V, resulting in significant energy savings, as depicted in Fig. 1.
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article{osti_41607, title = {The formulation and combustion characteristics of coalwater slurry fuels from impounded coal fines}, author = {Miller, S F and Morrison, J L and Scaroni, A W}, abstractNote = {The current political and economic climates mandate greater efficiency in energy production and use. One area of waste in coal processing involves the production and impoundment of fines ...
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Coal water slurry product was more competitive or cheaper than MFO in terms of fuel cost in power plants. Fuel cost of coal water slurry product was USD million/year, and MFO was USD million/year. Based on the result of the study above, the coal water slurry process is feasible to be implemented with adequate infrastructure support
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Therefore, there are many methods studied for saving energy and increasing efficiency of hydrogen production [7], [8], [9]. CWS (coal water slurry) electrolysis not only could increase efficiency of hydrogen production (Faraday current efficiency closed to ) from water electrolysis [10], [11], but also could achieve purity of coal, such as ...
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Coal water slurry (CWS) is an important cleancoalbased liquid fuel with the characteristics of highefficiency and lowpollution. This paper aims to implement the principles of clean production and prepare CWS by coblending coal particles and polyethylene terephthalate (PET) microplastics.
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Abstract. In this paper, based on Fluent software, a fivenozzle gasifier reactor was established to simulate the gasification process of oilbased drill cuttings coalwater slurry. The influence of concentration and oxygen/carbon atomic ratio on the gasification process of oilbased drill cuttings coalwater slurry was investigated.
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The production process and physical picture of BDO tar. Depending on BDO's largescale production capacity, BDO tar should increase. ... Preparing coal water slurry from BDO tar to achieve resource utilization: combustion process of BDO tarcoal water slurry. Energy Fuels, 33 (2019), pp. .
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One of the lots was of ultraclean coalwater slurry fuel (UCCSF) for which a twostage caustic and acid leaching procedure was developed to chemically clean the coal. As a part of the contract, AMAX R and D more » developed a conceptual design and preliminary cost estimate for a commercialscale process for UCCSF manufacture.
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The purpose of this research is to determine the effect of the series system on the SCWG of watercoal slurry. This paper has established an innovative series SCWG system and modeled the entire flowsheet. ... Thermodynamic study on the integrated supercritical water gasification with reforming process for hydrogen production: effects of ...
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The three technology categories are considered as the "pulping", "pumping" and "endprocessing". The "pulping" category addresses technologies related to the production process of coalwater slurry. The "pumping" category addresses technologies related to the transport of coal slurry along a pipeline to its destination.
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Coal water slurry (CWS) It is used as fuel and considered as forefather of coal . In the ladder the next step is lignite which has a calorific value of BTU per pound and moisture content is of 2535%. It is used for electricity generation. : The next grade is subbituminous which contains heating value of 8300 to 13,000 BTU/pound ...
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article{osti_324767, title = {Coalwater slurry fuel production: Its evolution and current status in the United States}, author = {Morrison, J L and Miller, B G and Scaroni, A W}, abstractNote = {Interest in the US in utilizing bituminous coal in a slurry form has evolved substantially over the last two decades. In the mid1970`s, technologies to utilize coaloil mixtures (COMs) as potential ...
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Advanced coaltoammonia technology, represented by coal water slurry gasification, showed a lower environmental burden than the traditional intermittent gasification technology, especially in terms of greenhouse gas (GHG) emissions and energy consumption. ... Considering that the research object is an actual production process, the actual ...
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Coalwater slurry or coalwater mixture (CWS or CWM) is a complex solidliquid dispersion. Several research works have been done concerning the production and use of CWSs being developed worldwide in several different governmental, industrial and academic facilities.
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Coalwater slurry is a new, efficient and clean coalbased fuel. It is a mixture of 6570% coal with different particle size distribution, 2934% water and about 1% chemical additive. Many countries have researched and developed it as coalbased fuel technologies based on longterm energy strategy considerations.
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This paper reports a novel process that consists of two steps: the oxidation of the coal slurry by ferric ions (III) in a hydrothermal reactor at a temperature of 120160 °C and the electrooxidation of ferric ions (II) in the electrochemical cell to produce hydrogen.
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The hydration film exerts a lubrication effect, decreasing the friction between the particles. The agglomeration between the coal particles also decreases, resulting in the decrease in the apparent viscosity of coal slurry and the increase in mobility. Therefore, it can be used as an additive in coalwater slurry (CWS).
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In 2021, Chen [34] investigated the influence of coal rank on coalassisted water electrolysis for hydrogen production, utilizing a constant potential of approximately V, which remains below V. These studies laid the foundation for the application of CWS electrolysis and demonstrated the energysaving potential through anodic CWS ...
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The development of ecologically clean technology for coal use in terms of the coalwater slurry usage. I. A. Korotkiy E. N. Neverov V. Murko O. Chernikova. Environmental Science. 2021. The baseline conditions of technology for producing and burning coalwater slurries in Russia and foreign countries is exposed.
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Abstract Keywords Coal water suspension Settling characteristics Particle size distribution Rheological characteristics Headloss characteristics Specific enthalpy consumption Acronyms Greek SymbolsSymbol Description Units (SI system) γ Shear rate in internal flow s −1 ε Surface roughness of pipe m μ Dynamic viscosity of the suspension
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The production of coalwater slurry fuel involves the crushing of coal or coal sludge to particles between 10 and 65 micrometers diameter (standard crushers can be used); wet milling and homogenisation (with additives as required). The resulting product ( coal slurry) is then prepared for intermediate storage or transport.
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The coal gasification process produces a large amount of wastewater which is seriously polluted and difficult to biochemically treat. The regasification of coal water slurry produced from gasification wastewater meets the requirements of clean and efficient use of energy and the concept of circular economy.
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Chu et al. [21] studied the mechanism of modified sludgecoal water slurry (MSCWS) and significantly improved the fluidity and stability of the slurry. Zhang et al. [22] used a coal chemical sludge as raw material and mixed it with lignite, coking coal and lean coal to prepare SCWS; it was shown that the addition of appropriate proportion of ...
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The temperature in the reactor was varied in the range of °C. An analysis of the composition of the gas obtained during the gasification of three fuels showed that the coalwaterslurry (40 wt% coal, 60 wt% water) was characterized by the maximum yield of H 2 ( vol%) and the minimum share of CO 2 ( vol%). The largest ...
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A numerical simulation analysis of the effects of O/C ratio and coal concentration in coal water slurry (CWS) on the flow and temperature fields of gasifier, gas composition, and carbon conversion ...
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Multipeaking gradation technology is an essential method for improving the slurry ability of coal particles. In this study, the coarse (150300 μm), fine (5474 μm), and micro (110 μm) coal particles with different ratios were applied to prepare coal water slurry (CWS). The ratio of coarse, fine, and micro particles in bimodal CWS, interval bimodal CWS, and triplepeak CWS was 60:40: ...
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In the production process, noncompliant wastewater was treated and reused in industrial production, which can greatly reduce the consumption of fresh water and lessen pollutant emissions [4], [5]. Coal water slurry (CWS) [6], [7] refers to a suspended dispersion system containing coal, water and a small amount of additives.
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The attraction of the coalwater slurry is its complete independence of an oil supply; coaloil mixtures are effectively a means of extending oil supplies and are less economically beneficial. ... On the other hand, the CO 2 capturing process is required for methanol production from the IGCC power plant. Therefore, the effect of the CCS system ...
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1. Introduction. Coal has long been used as a fossil fuel to meet a significant proportion of the world's electricity needs (Blissett and Rowson, 2012; Cao et al., 2016).Despite its wide range of applications, the efficiency of converting coal into electricity is often less than 40%, and its extensive use raises a number of environmental concerns (Jewell et al., 2019; Liu et al., 2005).
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In the present study, two types of wastewater, namely, gasifier wastewater (GW) and wastewater from a secondary sedimentation tank (SW), were used to prepare coal water slurry (CWS), which was labeled as coalGWslurry (CGS) and coalSWslurry (CSS), respectively, with coaldeionized waterslurry (CDS) as a reference.
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A material supplier from Belgium would like to produce limestone powder for his custome...
India is rich in various mineral resources and it is an important mineral processing market
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