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).
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.
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 ...
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 ...
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.
Study 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
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 ...
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 ...
Methanol is an important feedstock of chemical engineering and energy source, and it is mainly produced by coal route in China. The coaltomethanol suffers from serious CO 2 emissions and carbon resource waste since water gas shift is involved in this process to increase hydrogen content of syngas for meeting methanol novel coaltomethanol process integrated with cokeoven gas ...
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.
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 100%) from water electrolysis [10], [11], but also could achieve purity of coal, such as ...
(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 the syngas produced from ordinary coal water slurry.
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 ...
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.
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 ...
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.
DOI: / 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 ...
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 ...
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.
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
Coal water slurry (CWS), a highlyloaded suspension of coal in water, is regarded as one of the most important alternatives for fuel oil. Generally, additives are required for the preparation of CWS, of which polycarboxylate (PC) is the most promising and applicable one. ... Coal plays a vital role in maintaining the economic growth process ...
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.
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.
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 ...
Coal 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 ).
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 ...
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.
During 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 ...
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: ...
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 ...
Proximate analysis is an The CWS mixture is usually made by mixing 55 important quality control parameter for coal and coke. 70% coal and 3045% of water. The rotating blades of The proximate analyses are carried out by the TGA the coal mill are used to achieve a stable mixture. The 4000 equipment.
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. In the present paper, studies on the developments achieved in the past three decades with regard to the field mentioned ...
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.
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 ...
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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