قائمة الطعام
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 …
1. Introduction. Coal gasification technology converts coal into gaseous syngas, which has been widely industrialization in recent 20 years. To date, the coal has been massively utilized in the gasification field to meet the increasing global energy necessity [1].Whereas it should not be ignored that a large amount of coal gasification …
The test materials consist of aeolian sand, modified coal gasification slag (MCGS), and P.O 42.5 cement. The aeolian sand serves as the aggregate, while MCGS and P.O 42.5 cement are used as cementing materials to prepare mine filling materials. Coal gasification slag (CGS) is produced at China Coal Energy Group's coal chemical …
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 ...
The high value of coal gasification slag and the trend towards functional use of its resourcefulness. The fractional utilization of the carbon and ash components of the gasification slag is a prerequisite for its solid waste disposal. However, as CGFS undergoes a complex heat and mass transfer gasification process, its carbon and ash …
The coal gasification slag was used to replace cement at a value of 10 %, and the compressive strength of cement mortar increased slightly, which was mainly because coal gasification slag can fill the pore structure of mortar [22]. Partial replacement of cement by coal gasification slag with a content of 10 % could slightly improve the ...
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 ...
As a result of coal gasification, carbon emissions are considerably decreased [20, 21]. Among the coal gasification methods, plasma gasification is recognized as a relatively new technology using plasma torch in order to produce clean and renewable fuels [22]. During the process, the raw material in the system are …
Based on the experimental experience by Liu [28], [29], [30], the viscosity of slag should be usually maintained to be lower than 2.50 Pa s so as to guarantee the coal gasification reaction process proceeding smoothly and the subsequent processing of the slag (granulating-rotary cup atomizer). Meanwhile, the lower gasification temperature …
Coal gasification slag (CGS) is the residue produced during coal gasification. The slag discharged with the gas stream is called fine slag, and the slag discharged in the lock hopper is called coarse slag [33] With the popularity of the coal gasification process, a large amount of CGS is annually produced in China, which has …
The coal gasication is the key process of clean usage of coal resource, which inevitably produces a large amount of coal gasication slag (CGS), and causes serious environmental pollution and ecological damage. The high ash content of coal gasication ne slag (CGFS) prevents the ecient utilization of residual car-bon in CGFS.
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 …
Preparation of coal gasification fine slag-based supercapacitive carbon using hydrothermal deashing and alkali activation. Published: 11 January 2024. …
Helps the economic competitiveness of coal, in general, and integrated gasification combined cycle (IGCC) processes in particular. The interest in using slag is largely …
Coal gasification fine slag (CGFS) from the entrained-flow coal gasification process mainly contains ash and residual carbon. Currently, the CGFS is normally stacked and landfilled in slag yards, resulting in huge resources waste and potential environmental risks. This study aims to review the research advances of the characterizations, carbon ...
Coal gasification fine slag (CGFS) is a kind of amorphous silica-alumina solid waste with large surface area and broad pore-size distribution which has the potential to store and release humic acid (HA). In this study, the adsorption capacity of HA onto CGFS tuned by contact time, HA initial concentration, temperature, pH and CGFS …
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 …
In Part I, we review the main types and the operating conditions of entrained-flow gasifiers and coal properties used in IGCC plants; we identify and discuss the key coal ash properties and the …
Coal gasification slag (CGS) and Fe-modified CGS (FGS) were employed to remediate cadmium (Cd) and arsenic (As) in co-contaminated agricultural soils. Adsorption experiments in aqueous systems and stabilization experiments in soil were conducted to evaluate the passivation potential of the CGS and FGS. The maximum adsorption …
Coal gasification fine slag is a kind of solid waste with low resource utilization rate. The complex embedding of residual carbon and inorganic minerals (ash materials) is the main reason restricting the efficient resource separation and utilization of residual carbon or ash materials. Hydrophobic–hydrophilic separation (HHS) is a …
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.
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 …
Gasification or combustion of coal and biomass is the most important form of power generation today. However, the use of coal/biomass at high temperatures has an inherent problem related to the ash generated. The formation of ash leads to a problematic phenomenon called slagging. Slagging is the accumulation of molten ash on the walls of …
Gasification fine slag (GS) is a kind of solid waste produced in the process of coal gasification. Due to its high annual production and large accumulation, it is potentially harmful to air quality and groundwater, and has certain impact on human health, so resource utilization of coal gasification slag is an urgent problem at present. …
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, …
Coal gasification slag contains some coarse particles, including unburned carbon particles (density < 1.8 g∙cm −3) and inorganic minerals (density > 2.5 g∙cm −3) …
Coal gasification slag possesses a large surface area for adsorption, providing many chemisorption sites and enhancing its adsorption capacity. In addition, it …
Coal gasification slag (CGS) is a solid waste produced during coal gasification [1] and gasification converts flammable components into combustible …
The three kinds of coal gasification fine slag can be separated to different extents in terms of HHS, carbon elements enriched in concentrates, and metal elements and silicon elements enriched in …
Coal-gasification slag (CGS) was subjected to mechanical grinding by three different methods. We studied the effects of mechanical activation on various physical and chemical characteristics of the CGS, including particle-size distribution, specific surface area, mineral composition, degree of crystallinity, particle morphology, chemical bonding, …
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