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 ...
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.
In this work, the pyrolysis behavior of coalwater slurry and coaloilwater slurry at various temperatures of °C in a fixed bed reactor was studied. For the pyrolysis of coalwater slurry and coaloilwater slurry, the increase of pyrolysis temperature and water content promoted an increase in gas production but resulted in a ...
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 ...
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 ...
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 ...
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
It 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.
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 ...
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 ...
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 ...
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.
(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 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.
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.
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.
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].
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 ...
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 ...
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 ...
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).
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.
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.
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 ...
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
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. .
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 ...
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 ).
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 ...
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).
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
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.
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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