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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article{osti_, title = {Technical/economic analyses of minetomarket scenarios involving varying levels of coal preparation and coal water slurry production using a computerized coal evaluation model: Final report. [Report includes program on a disk in pocket]}, author = {}, abstractNote = {The Coal Evaluation Model (CEM) has been designed to allow the user to estimate the costs ...
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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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Illustration of concentrated suspensions showing that at a given solid's content the volume of sediment depends on particle aggregation. Source: After Laskowski and Parfitt, 1989 with permission of Taylor Francis.
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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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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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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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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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Abstract Dispersants, serving as an essential raw material in the formulation of coal water slurry, offer an economical and convenient solution for enhancing slurry concentration, thus stimulating significant interest in the development of novel and efficient dispersants.
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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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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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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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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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Fig. 1 shows the production process of BDO tar [7]. ... Some chemical wastes mix into coalwaterslurry (CWS) in a proportion known as wastecoalwaterslurry (WCWS), which can control waste releases and recycle valuable resources. With the development of the gasification technology of CWS, the adaptability of raw materials is continually ...
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Simplified block diagram of gasification process for syngas production. Coal slurry is first prepared by crushing the coal to a size of mm particle diameter along with water addition. The coal slurry is the pumped to the gasifier where the reactions take place in the controlled amount of oxygen.
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The main production process of BDO is the Reppe method. In the purification process ... on the gasification process of coal water slurry, the SEMEDX (Tescan VEGA3 SBHBRUKER XFlash 6|30, Germany ...
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1. Introduction. Compared with coal gasification or steam reforming for hydrogen production [1], [2], water electrolysis for hydrogen had some advantages, such as clean, purity, mild conditions and so on [3], [4].However, water electrolysis also had some limitations, such as high energy consumption [5], low current efficiency [6].Therefore, there are many methods studied for saving energy and ...
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Coal gasification is a key process in the production of synthetic ammonia, and the coal water slurry (CWS) pressurized gasification technology is commonly used, which adopts CWS feed and pressurized gasification in an entrained bed, and CWS reacts with oxygen at high temperature and pressure to produce syngas [3].
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This study investigated the process and mechanism of synergistically assisted hydrogen production from tailings and coal slurry. We have identified the optimal tailings as leadzinc tailings through experimentation with different tailings mixed with pulverized, we have analyzed the electrochemical properties of Fe 2+ and Fe 3+ at different concentration gradients in a ...
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As a part of clean coal technology, the coal water slurry has a popular application in the conventional and new thermal power stations. The hydrotransport is nowadays a preferred method, due to its low specific energy consumption and nonpolluting nature. The lignites and high ash coals, available in abundance, show poor slurryability, thereby making the process unsustainable.
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A total of eight types of organic wastewater were used in the study. Gas washing water (A), sulfur water (B), carbonized water (C) and slag discharge water (D) were the coal gasification wastewater produced by the entrained bed process; Yima wastewater (F) was coal gasification wastewater produced by the crushed coal fixed bed process (Lurgi furnace); coking wastewater (E) was produced by the ...
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Dispersion mechanism of coal water slurry prepared by mixing various highconcentration organic waste liquids Shuangni Wang a, Jianzhong Liu a, Sarma V. Pisupati b, Dedi Li a, Zhihua Wang a, Jun Cheng a Add to Mendeley https://// Get rights and content Abstract
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Municipal sewage sludge always includes considerable amount of water, noxious substances, and varying chemical compositions; therefore, sludge utilization is imposed. Coalsludge slurry (CSS), which is made by blending sewage sludge with coal, water, and additives, is being identified as a new and effective sludge utilization technology. The main objectives of the present investigation are ...
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Gasification slag is the solid residue remained after combustion and gasification of coal, likewise, it is the product of a series of coal matrix decomposition and chemical reactions of minerals in coal. In 2019, the total coaltoproduction of liquid, gas, olefin and ethylene glycol was approximately million tons, with an annual coal ...
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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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Hydrogen oxidizes to produce only water and has a high energy density output of 143 MJ/kg, making it a promising energy carrier for future energy systems [1][2][3] [4] [5][6]. Hydrogen gas is ...
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The thermochemical process produces a fairly cleaned and thermally upgraded coal product that would not reabsorb moisture even when placed in a water medium at high pressure.
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