In the Shell gasification process, coal is crushed and dried and then fed into the Shell gasifier as a dry feed. The gasifier, as shown in Figure 8, is an oxygen-blown, water-wall gasifier eliminating refractory durability issues. It is good for wide variety of feed stocks, from pet coke to low-rank coals and has been run on biomass as well.
coal-to-chemicals industry is leading the charge and employing technologies that were not available only a few years ago. Although gasification use is spreading, researchers worldwide are still working toward further improvements. There is still much more room for gasification to grow. Coal-to-gas in Europe could
On the other hand, coal gasification is commercial technology and produces a high amount of syngas and a low cost of production compared to the BG. Therefore, …
Coal gasification is recognized as the core technology of clean coal utilization that exhibits significant advantages in hydrogen-rich syngas production and …
Mostafavi et al. [32] investigated the sorption-enhanced gasification of ash-free coal and the hydrogen molar composition of 85% (dry basis) was achieved with the catalyst loading of 20 wt% and the CaO to carbon ratio of two. Also, the steam gasification of coal integrated with in-situ CO 2 capture was studied [33]. The utilisation of CaO ...
This article follows the development of early UCG (underground coal gasification) ideas. Historical facts are discussed mainly from the technological perspective and early experiments in UCG are analyzed. Our search for the first successful UCG experiment brings to light a new finding, which was commonly overlooked in previous …
Geoenergy technologies, including the Underground Coal Gasification (UCG), are currently being considered as possible solutions for reducing emissions of CO 2 and other gases to atmosphere and at the same time, provide sustainable sources of low-carbon energy. In this paper, a flexible risk assessment methodology for UCG technology …
Coal ignition is initiated through the use of an electric coil or gas firing near the face of the coal seam. Continuous oxidant flow through the injection well allows for gasification to be sustained [].The temperature of the gasification process is maintained through varying the oxidant flow to the reactor [].In UCG systems, the temperature of the …
The ash sample for this study was collected from a commercial-scale fixed-bed gasification unit in the eastern part of India. This coal gasification plant (CGP) has a syn -gas production capacity of 2,25,000 Nm 3 /h with a coal requirement of around 270 tons/hr. The plant was built based on Lurgi, Germany & SLTC, S. Africa technology.
Abstract. Underground coal gasification is a conversion and extraction process, for the production of useful synthetic product gas from an in-situ coal seam, to …
By igniting in the coal seam and injecting gas agent, underground coal gasification (UCG) causes coal to undergo thermochemical reactions in situ and, thus, …
The diversification of coal for its sustainable utilization in producing liquid transportation fuel is inevitable in countries with huge coal reserves. Gasification has been contemplated as one of the most promising …
The principal controlling properties of coal during the gasification process are its reactivity, ash and slag properties, particle size and coal caking and swelling. 2.3.1 Coal reactivity. Coal reactivity is one fundamental property essential for the success of the coal gasification process (Ozer et al. 2017). It is influenced by the degree of ...
The paper describes the results of research on the applicability of the ground penetrating radar (GPR) method for remote sensing and monitoring of the underground coal gasification (UCG) processes. The gasification of coal in a bed entails various technological problems and poses risks to the environment. Therefore, in parallel with …
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., …
Coal gasification is a promising option for the future use of coal. Similarly to gasification in industrial reactors, underground coal gasification (UCG) produces …
They divided the coal gasification process into three stages and prepared pyrolytic semi-coke (800 °C), reduced ash (900–1300 °C), and oxidized ash residue (1100–1500 °C) under different reaction conditions. The results indicated that Hg, Pb, Se, and Cd in coal react with S to form HgS, PbS, SeS, and Cd in the pyrolysis stage ...
Coal and Biomass Gasification. pp.425-454. In dual fluidized bed gasification technology, the gasification/pyrolysis and combustion reactions are decoupled and conducted in two separate fluidized ...
Herdem et al. [16] studied energy and exergy analysis of a coal gasification based combined system for hydrogen production. They used water gas shift reactor and alkaline electrolyzer in order to produce hydrogen. They demonstrated energy and exergy analysis of their combined system 58% and 55%, respectively.
Currently, hydrogen energy is the most promising energy vector, while gasification is one of the major routes for its production. However, gasification suffers from various issues, including slower carbon conversion, poor syngas quality, lower heating value and higher emissions. Multiple factors affect gasification performance, such as …
Depending on the gasification technology employed, significant quantities of water (H 2 O), CO 2, and methane (CH 4) can be present in the synthesis gas as well as several minor and trace components (Higman and van der Burgt, 2003).Under the substoichiometric-reducing conditions of the gasifier, most of the fuel's sulfur converts to …
Coal gasification process has recently been preferred, over conventional combustion practices, to be a popular practice due to the reduced environmental impact …
These coal gasification technologies can effectively improve coal utilization efficiency and reduce SO x, NO x, and CO 2 emissions. As the name …
A large amount of coal gasification slag is produced every year in China. However, most of the current disposal is into landfills, which causes serious harm to the environment. In this research, coal gasification fine slag residual carbon porous material (GFSA) was prepared using gasification fine slag flotation obtained carbon …
Gasification is the thermochemical conversion of organic solid material (coal, biomass, plastics, and organic waste) into a gaseous mixture of carbon monoxide …
Abstract. Coal gasification though introduced firstly in the 1950s to the world, only a few countries have successfully executed the technology to utilise the chemical energy of the feed coal ...
This study presents a preliminary assessment of the environmental impact of field-scale underground coal gasification (UCG) targeting deep-buried seams by studying the fate of the UCG products in the reactor vicinity. A series of simulation scenarios are conducted in three deep (900 m) areas of specific interest – namely, South Wales …
Underground coal gasification (UCG) in deep coal seam was attracting more and more attentions all over the world due to its characteristics of safety, clean and low carbon. In the study, the ignition of UCG in deep coal seam was simulated by employing computational fluid dynamics (CFD). A new method setting gas diffusion in …
Coal gasification is an important part of the global chemical industry, and plays a key role in the production of liquid fuels. Gasification for power generation is a growing industry (see Fig. 16.2) and will be an important technology for reducing the greenhouse gas emissions from coal-based power generation, ...
The technical feasibility of underground coal gasification (UCG) has been established through many field trials and laboratory-scale experiments over the past decades. However, the UCG is site specific and the …
Coal Gasification. Nicola J. Wagner, ... J.C. van Dyk, in Applied Coal Petrology, 2008 Publisher Summary. This chapter deals with coal gasification, which is a process that …
The Cabinet chaired by the Prime Minister Shri Narendra Modi approved the scheme for promotion of Coal/Lignite Gasification Projects of Government PSUs and Private Sector with an outlay of Rs.8,500 crore towards incentive for coal gasification projects under three categories. The cabinet has approved the scheme as follows:
1. Introduction. Underground coal gasification (UCG) is a process of in-situ conversion of coal into combustible gases. The process involves vertical drilling of injection and production wells up to the bottom of the coal seam and connecting them with a horizontal highly-permeable linkage [1].The reactants injected are air or oxygen, with or …
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Abstract. Coal gasification is an important industrial process for converting raw coal into more useful and cleaner carbon feedstocks for use in power generation …