Slag formation during gasification is related to coal properties, gasifier structure, operating conditions (e.g., temperature, pressure, carbon/oxygen ratio, and fluidized state), and so forth [22]. The main cause of slag formation during gasification or combustion is the large amount of minerals of alkaline-earth and alkali metals that are ...
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In the entrained-flow gasifiers used in integrated gasification combined cycle (IGCC) plants, the majority of mineral matter transforms to liquid slag on the wall of the gasifier and flows out the bottom. However, a small fraction of the mineral matter is entrained (as fly ash) with the raw syngas out of the gasifier to downstream processing. …
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4.2. Major Gasification Solid Byproducts. As discussed in the Background, solid waste from conventional pulverized coal-fired power plants is a significant environmental issue due to the large quantities produced, chiefly of coal fly ash, and the potential for leaching of toxic substances (e.g. heavy metals such as lead and arsenic) into the ...
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Preparation of coal gasification fine slag-based supercapacitive carbon using hydrothermal deashing and alkali activation. Published: 11 January 2024. …
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1. Introduction. Coal gasification, using coal or coal coke as raw material, is a reaction with gasification agents like oxygen, water vapor or hydrogen under high temperature to convert the combustible part into combustible gas fuel [1].Coal gasification slag is the solid waste produced in the process of coal gasification [2].Coal …
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Slag is the main by-product of coal gasification. According to the difference in the discharge mode and particle size, coal gasification slag is mainly composed of two parts, namely coarse slag and fine slag (Pan et al., 2016).Herein, coarse slag is mainly discharged from the bottom of the gasifier, while fine slag is mainly from the dust …
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The slag rock hopper has a mechanism that allows for the discharge of the slag under normal pressure from the under-high-pressure EAGLE furnace.Effect of CaO-SiO2-FeO slag system on coal gasification, · A new method of coal gasification with steelmaking slag as heat carrier and catalyst is put forward.
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The slag from the gasifier can be used as a construction material. The uhde ® entrained-flow gasification process with direct quench is used in Bionext's BioTfueL ® plant for advanced biofuels in Dunkirk, France. The uhde ® entrained-flow gasification process with direct quench (PDQ) is an optimized design of the proven
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PURPOSE:To obviate large lumpy slag-bite inability of a roll crusher and prevent slag accumulation in a coal gasification oven equipped with the coal gasification oven body, an external pressure vessel surrounding the body, a slag hopper communicating with the lower part of the pressure vessel and filled with water, and the roll crusher to crush …
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In this study, a novel binder was developed by incorporating multiple solid wastes, namely red mud (RM), carbide slag (CS), phosphogypsum (PG), and coal gasification slag (CGS). RM, CS, and PG were used as activators to synergistically activate two kinds of ultra-fine CGS precursors with median particle sizes of 5.2 μm and …
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Here, a novel adsorbent was prepared from coal-gasification fine slag by acid leaching and amine modification and was used for CO 2 capture. The fine slag adsorbent (FSA) material was found to have a specific surface area of 541 m 2 g −1 and a pore volume of 0.543 cm 3 g −1.To improve the CO 2 adsorption capacity of the material, …
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Fine slag (FS) is an unavoidable by-product of coal gasification. FS, which is a simple heap of solid waste left in the open air, easily causes environmental pollution …
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Approximately 15% ∼ 20% of coal gasification slag (CGS) is generated during the coal gasification process, including coal gasification coarse slag ... First, CGS was crushed by a jaw crusher, and the 0.5 mm screen to ensure it met the maximum grinding limit of the ball mill. Next, different types of initiators were mixed with CGS to …
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Ohtsuka et al. studied the steam gasification of coal and found that CaCO 3, Ca(NO 3) 2, and Ca(OH) 2 exhibited strong catalytic effects. ... The coal and the carbide slag samples were crushed by a jaw crusher and grounded by a ball mill. These samples were selected with a particle size of 0.038–0.075 mm and dried at 105 °C in a constant ...
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During coal gasification at high temperature and pressure, the differences in reactivity of organic matter in coal are almost negligible; however, the transformation behaviour of minerals is important to the stability of the process. Detailed knowledge of the mineralogical properties of ash and slag is essential for optimizing the operational ...
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Gasification in entrained flow reactors is now one of the most dynamically developed technologies of thermal conversion of coal. The basic, solid by-product of this process is slag, and in some cases also fly ash. In Poland, so far there have been no examples of industrial application of coal gasification. However, the high popularity of such systems …
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The viscosities of 45 coal ash slag samples at high temperature have been measured under different temperatures and shear rates. The computer thermodynamic software package FactSage has been used to predict liquidus temperatures, volume fractions of crystallized solid particles (ϕ), and the compositions of remaining liquid phase …
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Coal gasification is recognized as the core technology of clean coal utilization that exhibits significant advantages in hydrogen-rich syngas production and CO2 emission reduction. This review briefly discusses the recent research progress on various coal gasification techniques, including conventional coal gasification (fixed bed, …
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In contrast, the coal gasification fine slag (CGFS) has a significantly higher content of unreacted carbon (within the range of 15–50 %, dry basis). In China, CGFS is recognized as an industrial solid waste with an annual production of about 30 million tons, which brings great pressure to the sustainable development of the ecological ...
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1. Introduction. Coal gasification generally refers to an incomplete reaction between various coal (coke) and oxygen-carrying gasification agents (O 2, H 2 O, CO 2), and finally produces a gas composed of CO, H 2, CO 2, CH 4, N 2, H 2 S, COS etc (Fan et al., 2019).Coal gasification technology is the core of clean and efficient conversion of …
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Because the XinJiang coal has not been used for gasification production, there was no slag available at present. Thus, coal ashes formed by direct combustion of Xinjiang coal were collected as the experimental slag. The chemical composition of the collected slag was analyzed by the wet chemistry analyses, and the results are shown in …
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In the high-temperature range, besides the active element Fe, the residual carbon in the coal gasification slag was prone to oxidation-reduction reactions, reducing nitric oxide to nitrogen. A new waste-to-value concept is introduced in this study, which promotes green technology for sustainable development.
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1. Introduction. Coal gasification slag (CGS) is a new type of solid waste produced from entrained-flow coal gasification (Rodney Andrews et al., 2006), which can be divided into coarse slag (CS, discharged from the lock hopper) and fine slag (FS, discharged by air flow) (Zhao et al., 2010).In China, around 700 various coal …
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Coal gasification slag possesses a large surface area for adsorption, providing many chemisorption sites and enhancing its adsorption capacity. In addition, it …
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With the mass production of coal-based solid waste, coal mine filling can effectively consume it. The coal gasification slag is modified and prepared as coal mine filling material to meet the relevant technical requirements, which can realize the recycling of coal mine → coal chemical industry → coal mine. In this paper, in order to explore the …
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This paper describes how the aggregate test and concrete test were conducted on coal gasification slag in order to examine whether coal ash slag can be used as a fine …
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2.2 Features of EG slag The slag that has flowed from the coal gasification unit is water-cooled in the slag cooling unit, passes through the slag crusher and is collected within the slag rock hopper. The slag rock hopper has a mechanism that allows for the discharge of the slag under normal pressure from the under-high-pressure EAGLE furnace.
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Coal gasification slag (CGS) is a solid waste produced during coal gasification [1] and gasification converts flammable components into combustible …
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Coal gasification fine slag (CGFS), which is the by-product of entrained-flow coal gasification, has superior properties, such as a large surface area, a broad pore size distribution, and a high content of carbon. This material has the potential to amend poor soils. This study was carried out to investigate the use of CGFS as a soil amendment for …
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Review and Perspectives of Ash Slag Fluidity during Co-gasification of Industrial Solid Waste and Coal: Characteristics, Chemistry, Controlling Mechanisms, and Regulation | …
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