The coal gasification is the key process of clean usage of coal resource, which inevitably produces a large amount of coal gasification slag (CGS), and causes serious …
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 …
1. Introduction. The coal resource reserves account for 90% of the world's total energy reserves, and most countries in the world use coal as the mainstream energy source for industrial development (Matamba et al., 2022).And the clean utilization of coal resources is concerned with the key to the transformation of national economies towards …
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 …
1. Introduction. In 2022, the annual production of coal gasification slag (CGS) in China exceeded 50 million tons (Guo et al., 2024; Su et al., 2024), of which coal gasification coarse slag (CGCS) and coal gasification fine slag (CGFS) accounted for 60 %–80 % and 20 %–40 %, respectively (Jiang et al., 2021; Zhang et al., 2019).At present, the disposal …
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.
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 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 …
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 …
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 …
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 …
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 …
Coal gasification slag is formed by physical and chemical transformation of inorganic minerals in coal, which can be divided into coarse slag and fine slag. Coarse slag is produced in the slag discharge mouth of gasifier, accounting for 60–80 %. Its main components are silica, alumina, calcium oxide and iron oxide, etc., with high added value ...
Preparation of coal gasification fine slag-based supercapacitive carbon using hydrothermal deashing and alkali activation. Published: 11 January 2024. …
Review and Perspectives of Ash Slag Fluidity during Co-gasification of Industrial Solid Waste and Coal: Characteristics, Chemistry, Controlling Mechanisms, and Regulation | …
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 …
Coal gasification crude slag (CGCS) is the side-product of the coal gasification process, and its effective utilization has attracted great attention. A novel flocculant of poly-aluminum-ferric-acetate-chloride (PAFAC) was synthesized based on the recovery of CGCS by a two-step acid leaching process, namely HCl-acid leaching and …
1. Introduction. Coal gasification fine slag (CGFS) is a by-product of coal gasification, with large output, high carbon content and high calorific value (Guo et al., 2020a).Coal gasification crude slag is similar in composition to boiler bottom slag, which can be used as mixed raw material of road, bridge and other building materials.
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 …
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 …
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.
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 …
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. …
Coal gasification slag (CGS) is a solid waste produced during coal gasification [1] and gasification converts flammable components into combustible …
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, …
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.
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 ...
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 …
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 …
The method of steam gasification of low-rank coal in molten slag was proposed. ... The mean particle size of coal was 75 μm, which was crushed by a hammer, crusher and then sieved by a series sieve shakers. The ultimate analysis of the coal sample was conducted using a CHNS/O Analyzer, Perkin Elmer PE 2400 series II. ...
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 …
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
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 …
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, …
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 ...
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 ...
1. Introduction. Coal gasification slag (CGS) is a solid waste produced during coal gasification [1] and gasification converts flammable components into combustible gases such as H 2, CO, CH 4 [2].Coal gasification technology is considered as a major technology for efficient and clean coal utilization [3].Gasification techniques are …
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 …