To improve the efficiency of the gasification or combustion process of coal water slurry (CWS), it is significant to optimize the rheological properties and increase the solid concentration of CWS. ... The flow chart of improved SFF method for refined coal production was shown in Fig. 1. Fig. 1 The flow chart of pilot platform for refined coal ...
WhatsApp: +86 18838072829The 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.
WhatsApp: +86 18838072829Abstract. 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 ...
WhatsApp: +86 18838072829Coalwater 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.
WhatsApp: +86 18838072829The 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 ...
WhatsApp: +86 18838072829In 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.
WhatsApp: +86 18838072829As 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.
WhatsApp: +86 18838072829The 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.
WhatsApp: +86 18838072829In 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 ...
WhatsApp: +86 18838072829Advanced 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 ...
WhatsApp: +86 18838072829The 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.
WhatsApp: +86 18838072829Municipal 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 ...
WhatsApp: +86 18838072829This 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.
WhatsApp: +86 18838072829Multipeaking 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: ...
WhatsApp: +86 18838072829Coal slurry pipeline transportation refers to the process of using highpressure pumps to continuously transport coal slurry through closed pipes to endusers ( Lahiri and Ghanta, 2008 ).
WhatsApp: +86 18838072829Illustration 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.
WhatsApp: +86 18838072829The 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).
WhatsApp: +86 18838072829Simplified 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.
WhatsApp: +86 18838072829Abstract. 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.
WhatsApp: +86 18838072829The 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
WhatsApp: +86 18838072829A 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 ...
WhatsApp: +86 18838072829(b) In the industrial application process, the active component of the syngas produced from the gasification of the coal mixed wastewater slurry can reach % and has a higher H2 content than ...
WhatsApp: +86 18838072829The coalwater slurry can be provided at a high coal content so that the slurry can be burned directly without need for dewatering at its destination.}, doi = {}, url = ... A process for preparing a carbonaceous slurry with a Brookfield viscosity of less than 5,000 centipoise when it is measured at a solids content of 70 volume percent, ambient ...
WhatsApp: +86 18838072829A 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 ...
WhatsApp: +86 18838072829Study on the preparation of coal wastewater slurry from salt/alkali wastewater Lin Li a, Chuandong Ma a, Xiaoteng Li a, Jianqiao Lyu a, Hao Yu a, Qingbiao Wang b c, Zhenhua Wang a d, Benlu Guo e, Xiaofang You a Add to Mendeley https://// Get rights and content Abstract
WhatsApp: +86 18838072829Abstract 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
WhatsApp: +86 18838072829DOI: / Corpus ID: ; Study on coal water slurries prepared from coal chemical wastewater and their industrial application article{Li2020StudyOC, title={Study on coal water slurries prepared from coal chemical wastewater and their industrial application}, author={Dedi Li and Jianzhong Liu and Shuangni Wang and Jun Cheng}, journal={Applied Energy}, year ...
WhatsApp: +86 18838072829To improve the efficiency of the gasification or combustion process of coal water slurry (CWS), it is significant to optimize the rheological properties and increase the solid concentration of CWS. Particularly, preparing CWS from low quality coal remains a peculiarly intriguing subject due to the large reserve and low price of low quality ...
WhatsApp: +86 18838072829During the coal mining process, underground water is generated from the longwall face. In the meantime, the coal cutting process would produce coal particles. Coal slurry is generated in the underground working site, especially for water abundant coal mines. The generated coal slurry is treated to prevent water pollution. Due to the extensively existing of the suspended solid, the traditional ...
WhatsApp: +86 18838072829It was found that activation energy of conversion is E = 103 kJ/mol and the preexponential factor is A0 = × 10 s 1. It was revealed that coal gasification in SCW without oxidants is the weakly endothermic process. The addition of CO 2 into SCW decreases the conversion rate and increases the CO yield.
WhatsApp: +86 18838072829This 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 ...
WhatsApp: +86 18838072829Coalwater 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. In the present paper, studies on the developments achieved in the past three decades with regard to the field mentioned ...
WhatsApp: +86 18838072829Gasification 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 ...
WhatsApp: +86 18838072829One 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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