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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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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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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The prepared coalwater slurry consisted of 23% to 50% Lochiel coal and 40% Bowman's coal. The authors found that the solid concentration a ff ected the nature of the slurry, with 23% Newtonian
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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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Municipal sludge (MS) is used to prepare coal water slurry (CWS). This practice is beneficial for resource utilization and reduces treatment costs and environmental pollution. In this study, alkalimodified municipal sludge (AMS) was prepared with Ca(OH)2 as modifier and mixed with coal to produce AMSCWS. The effect and mechanism of MS and AMS on slurry ability, stability, and combustion ...
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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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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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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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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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Abstract. Coalassisted water electrolysis can reduce the electricity consumption of traditional water electrolysis by 4060%, but the rate of hydrogen production in this process is very slow. Some coal gasification wastewater can promote the electrical oxidation of coal, the addition of which can achieve resource utilization of wastewater ...
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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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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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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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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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In recent years, researchers have focused on improving the reaction rate of coalassisted water electrolysis from several perspectives. Yin et al.[21] investigated the performance of a series of solution catalysts in coal slurry electrolysis, and the results showed that Fe 3+ has the best catalytic effect. Jin[22] evaluated the kinetic ...
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Wet coal fines are currently disposed of as waste due to the lack of an economic process to remove the moisture in it, so that it can be combusted in a conventional process. Coal fines can contain up to 80 wt% water after flotation, which can be reduced to 30~55 wt% through thickening via gravity settling/filtration using a large filter funnel.
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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 is one of the most important fossil fuels in the world. In recent years, the demand for fossil fuel energy has increased. Coal water slurry (CWS) is composed of approximately 6075% coal, 2540% water, and 1% additives; it is environmentally friendly At present, the anionic additives used in industrial applications include naphthalenesulfonates, aliphatic sulfonates, lignin sulfonates ...
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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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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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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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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 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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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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since 2015, and the 2,000 ton (coal) slurryfeed gasifier pressure is 87 bar resulting in significant operating cost and energy saving for downstream chemical process. An Air Products slurryfeed gasification system has been running on petcoke since 2000, producing ammoniabased fertilizers with all syngas CO 2 recovered and sent to a CO 2
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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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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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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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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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