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 ...
ABSTRACT Oilfield wastewater was used to prepare coal slurry, which is called coaloilfield wastewaterslurry. The gasification properties of coaloilfield wastewaterslurry and coal water slurry were studied by using the thermogravimetry method, and the promoting effect of oilfield wastewater on gasification was also determined at the micro level. Results showed that coaloilfield ...
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.
An experimental study of the ignition and combustion processes of coalwater slurry (CWS) droplets based on coal enrichment waste in a hightemperature oxidizer at 650850 °C with a syngas addition was carried out. The fuel slurry was a mixture of finely dispersed solid combustible particles (coal sludge, 10100 µm in size) and water. The syngas was a product of biomass pyrolysis and two ...
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 ).
Coalwaterslurry preheating technology offers another opportunity to boost energy efficiency during gasification, ... Aspen Plus is used to model the chemical production process, and GT Pro is used to model the power generation process. In Section 4, the distribution of exergy loss in the system is mapped, and the impacts of different ...
Mining coal. Coal miners use large machines to remove coal from the earth. Many coal deposits, called coal beds or seams, are near the earth's surface, but others are deep mining methods allow coal miners to easily reach most of the nation's coal reserves and to produce about three times more coal in one hour than in 1978.
The liquid phase in coal slurry is mainly water, the density is 998 kg/m 3, and the viscosity is Pa s; the density of the coal slurry mixed solution is 1220 kg/m 3, and the viscosity is Pa s; the density of pulverized coal particles is 1728 kg/m 3, the particle size distribution is between and 2 mm, the particle size is set ...
Treating BDO tar from coalwaterslurry technology is effective. •. Na in BDO tar accelerates cogasification process. •. Na inhibits the formation of defective and amorphous carbon structures in coal char. •. More disordered carbon structures are generated due to O and Na complexes.
the 1980s. The largest producer and user of slurry fuels (Coal Water Slurry, CWS) is China [3]. Despite of several decades of CWS research history, investigations are still carried out to improve the parameters of disperse fuels and to improve the combustion of these fuels. The close relationship between the properties of slurry fuels and number of
The EGas process uses a coalwater slurry feed into an upflow, entrained flow gasifier ... This chapter presents studies on oxidized coal for the production of coalwater slurry. In a study described in the chapter, about 10 g of a lowrank bituminous coal was refluxed with 200 ml of 3(N)HNO 3 for 5 h. The treated coal was cooled ...
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 ...
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 ...
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.
Coalassisted water electrolysis for hydrogen production can effectively reduce electricity consumption and improve the economics of electrolytic hydrogen production technology. However, the influencing factors of this process, especially the mechanism of the electrolyte itself on the coal particles, are not clear.
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 ...
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].
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 ...
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.
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.
The average size of fuel droplets in the jet decreases by 512% in comparison with twocomponent coalwater fuel. Ignition delay time of a single droplet of slurry at oxidizer temperature 1273 K increases by 23% in comparison with twocomponent coalwater fuel when 10% of coal is replaced by liquid pyrolysis products.
A Novel ChemicalElectrochemical Hydrogen Production from Coal Slurry by a TwoStep Process: Oxidation of Coal by Ferric Ions and Electroreduction of Hydrogen Ions. ACS Omega 2022, 7 (9) ... The intensification technologies to water electrolysis for hydrogen production A review. Renewable and Sustainable Energy Reviews 2014, 29, 573588.
produced during coalassisted water,33 The process can be summarized by the following two reactions at the anode 4Fe 4Fe 4e23++−→+ (4) 4Fe C 2H O 4Fe CO (g) 4H3++++ → + ++ 2 2 2 (5) Even with the increase in the hydrogen production capacity of the coal slurry electrolysis through the improvements in the
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 ...
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.
In terms of energy consumption, the electrolysis of coal is preferred to water electrolysis; this is because kcal of electrical energy and a reversible potential of V are required to produce 1 mol of hydrogen in water electrolysis, whereas coal electrolysis only requires kcal and V, respectively. 16,17 This is achieved because the oxygen evolution reaction, which has high ...
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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