With the development of the coal chemical industry, the emission of coal gasification slag (CGS) has grown rapidly, raising widespread concerns about environmental …
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Modern coal chemical industry is an important way of clean utilization of coal. Entrained-flow gasification technology, known for its high gasification efficiency, intense gasification conditions, and large single-reactor capacity, has been widely applied in coal chemistry [1], [2], [3], [4].However, entrained-flow gasifiers generate over 30 million tons of gasification slag …
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The gasification slag consists of inorganic minerals and residual carbon. Generally, the carbon content of the coal gasification fine slag (CGFS), which is carried out by the syngas from the top of the furnace, is much higher than that of the gasification slag collected at the bottom of the furnace (Guo et al., 2020a). However, a large amount ...
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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 environmental pollution and ecological damage. The high ash content of coal gasification fine slag (CGFS) prevents the efficient utilization of residual carbon in CGFS. In this work, carbon-rich …
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Gasification has become an effective way to realize clean and efficient utilization of coal. Anthracite is characterized by low grindability index and low gasification reactivity, which is not suitable for fluidized gasifier and entrained-flow gasifiers for low carbon conversion and high crushing cost. However, due to its high thermal and mechanical strength, it is preferred to be …
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Chapter 1 provides a short background on gasification, lays out the objective and the scope of the report and defines "gasification technology" and "emergence" in the context of biomass and …
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At present, coal gasification slag (CGS) has not been effectively utilized, and it is still mainly piled or landfilled. With the increase in CGS accumulation, the problems of resource waste and environmental pollution become more and more prominent. Therefore, it is urgent to find an efficient and reasonable utilization method for CGS. The formation process of CGS is …
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Coal gasification technology has led to a significant increase in CGS discharge and consequently, the disposal of gasified solid waste gasification slag has become a major concern [10].It is reported that, more than 70 million tons of CGS is produced every year in China [11].Only a very small part of the slag is used, while the vast majority of CGS is simply dumped or …
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Gasification slag (GS) is rich in SiO2, Al2O3, and Fe2O3, and has excellent particle size gradation, which has the potential to be employed as an aggregate in the field of controlled low-strength material (CLSM). Nevertheless, the large-scale application of GS as the fine aggregate for the preparation of CLSM has been scarcely investigated. In the present …
үнэ авах WhatsApp: +86 18221755073The present invention provides a method of beneficiating slag, including mixing the slag with water to form a slurry. The slurry is screened through a first screen to remove a first portion of material and then screened through a second screen to remove a second portion of material. In one embodiment, the second portion of material has a carbon content less than about 5% and, …
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Coal gasification slag (CGS) is a solid waste produced in the process of coal gasification reaction. Coal gasification is the process of reacting coal with gasification agents (hydrogen, air, oxygen, and water vapor) at a certain temperature and pressure to convert the combustible part of coal into combustible gas, while the ash in coal is discharged in the form of …
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As the leading industry of coal chemical industry, Coal gasification plays an important role in efficient and clean utilization of coal. It is a process in which solid fuels such as coal, coke, or semi-coke react with gasifying agents under high temperature and pressure to produce gaseous products and a certain amount of slag (Aprianti et al., 2023; Xue et al., 2023; …
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Currently, the storage of coal gasification slag (CGS) is continuously increasing, as the coal gasification technology develops, posing significant environmental hazards. Due to its volcanic ash characteristics and rich residual carbon, CGS has great potential for resource utilization, which has attracted the attentions of many scholars. This paper firstly introduces the …
үнэ авах WhatsApp: +86 18221755073The coal gasification slag is divided into coal gasification coarse slag and CGFS (see Fig. 1) [6]. The CGFS in the two has a large loss of ignition, high water content, and difficult resource utilization. Moreover, the carbon content is generally over 30 % [7]. At present, there is a deficiency of highly effective methods to address CGFS ...
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Air is the most common gasifying medium used for gasification because of its easy availability and low cost [21].However, if steam acts as a gasifying medium, then product gas contains a higher H/C ratio [22].Using air and steam, McCaffrey et al. [23] studied the gasification of almond biomass on a laboratory scale fluidized bed gasifier. High hydrogen production and …
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CGS is classified into coal gasification coarse slag (CGCS) and coal gasification fine slag (CGFS). The CGCS is directly discharged at the bottom of the gasifier, and its composition is mainly aluminosilicates in the amorphous glassy state with relatively low carbon content (Guo et al., 2014).CGCS can be used for many applications, such as cement, road …
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The gasification process involves two distinct stages: coal devolatilization followed by char gasification, which is specific to the conditions of the reaction. The chapter also discusses the quality of various products obtained from coal gasification: low Btu gas, medium Btu gas, high Btu gas, methane, and hydrogen. Several chemicals as ...
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Coal gasification technology is an effective means to achieve clean and efficient utilization of coal. Coal gasification slag is generated in the process of coal gasification owing to the existence of minerals in the coal, particularly the incomplete reaction of the organic carbon elements in the coal. This results in different contents of residual carbon in the coal gasification slag.
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Abstract. 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.
үнэ авах WhatsApp: +86 18221755073Coal gasification slag (CGS) is a solid waste generated from the coal gasifier due to incomplete reaction between raw coal and gasification agents [20], [21], [22]. Statistics indicate that China's coal gasification industry discharges an excess of 33 million tons of CGS annually, with the total amount continuing to increase [23], [24], [25], [26].
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Алтны үйл явцын бутлуур цагаан алтны уурхайн үйл явц гэж юу вэ Монгол The polymerase chain reaction PCR is a biochemical technology in molecular biology to amplify a single or a few copies of a piece of DNA across several orders of magnitude generating thousands to millions of …
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