Coal gasification coarse slag (CGCS) is solid waste generated during coal gasification. The mainly treatment method of CGCS is storage and landfill, which causes severe environmental pollution and waste of land resources. Sodium silicate can be synthesized using CGCS after impurities are removed for the high content of amorphous silica.
· for coal Gasification Project" . • CFRI was also invited by Project Management Cell, UNDP/GEF Project (Steel), Ministry of Steel, Government of India for selection of appropriate Coal Gasification plant (capacity about 1500 Nm3/hr) and offered a letter for submission of project proposal. • CFRI is also going for development of modular ...
· Coal/biomass gasification plants: 140 plants-each similar to today's large coal-fired plants • Nuclear water splitting: 100 nuclear plants making only hydrogen • Oil and natural gas refinery: 20 plants, each the size of a small oil refinery, using oil and natural gas in multi-fuel gasifiers and reformers. 4. Hydrogen production from natural gas
The dominated alkali metal in Zhundong coal is sodium, and the limited potassium mainly exists as insoluble form [26, 42].Hence, the sodium transformation is mainly …
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 ...
· In order to mitigate the slagging risks of high-alkali coal (HAC) gasification while optimizing the operating temperatures for practical application, the experimental and calculational works were performed on the horizontal tubular furnace system and the FactSage 7.2 software, respectively. The slagging tendencies of three HACs were anticipated by applying different …
· Coal is an important fuel source used for generation of electricity. As the number of steam power plants increases to meet the increasing demand, so does the use of coal in excess of 550 mmt (million metric tonnes) in 2012 (Mukunda et al., 2010). Solid biofuels in the form of firewood, agricultural residues and dried
IGCC produces almost coal gasification slag as the solid by-product. IGCC slag is generated about 140,000 tons for a year although recycling of it is still in the …
· earth metals in low-rank coal during the gasification process. Sodium silicate results in the formation of slag, and a reduction of tempera-ture or the addition of coarse meta-kaolin at a feed-rate roughly equiv-alent to its ash content can successfully solve slag formation problems during a high sodium lignite gasification process [14,15].
The Rockgas process for the gasification of coal uses the partial oxidation of coal in a molten sodium carbonate medium to produce a low-Btu fuel gas for consumption at the site of the gasification plant. The sulfur and ash of the coal are retained in the melt, a sidestream of which is circulated continuously through a regeneration system for regeneration of the carbonate, …
For instance, sodium di-silicate (Na 2 O·2SiO 2 ) melts at 874°C (Dean, 1985) and forms glass as a result of the reaction between sodium carbonate and sodium silicate at 789°C (Hlavac, 1983). ...
Coal gasification is presented in terms of the chemistry of coal conversion and the product gas characteristics, the historical development of coal gasifiers, variations in the types and ...
The high sodium content of Zhundong coal restricts its application in direct combustion and supercritical water gasification is a promising clean and efficient coal conversion technology.
In this study, the transformation characteristics of sodium in Zhundong coal were investigated, following its combustion (oxidizing atmosphere) and gasification (reducing atmosphere) in a ...
IGCC produces almost coal gasification slag as the solid by-product. IGCC slag is generated about 140,000 tons for a year although recycling of it is still in the early stages. We evaluated the ...
The U.S. Department of Energy's Office of Scientific and Technical Information
· Coal is a cheap and abundant natural resource for energy. However, there have been some increasing environmental and health concerns in utilizing coal [1,2,3].Emergence of clean coal technologies is seen as a means of …
· Coal gasification coarse slag (CGCS) is solid waste generated during coal gasification. The mainly treatment method of CGCS is storage and landfill, which causes severe environmental pollution and waste of land resources. Sodium silicate can be synthesized using CGCS after impurities are removed for the high content of amorphous silica.
The invention claimed is 1. A process for coal gasification which comprises feeding particulate coal to a gasification reactor containing molten sodium sulfate at a temperature of from about 950°C to about 1,100°C, removing gaseous products from said reactor, conducting molten sodium sulfide produced in said reactor by reaction of said sulfate with said coal by gravity flow from …
· However, macromolecular organic groups generated from the supercritical water gasification process of coal would combine with L1, and formed L2 or L3 again, which explained why the concentration of L2 and L3 could keep at a relatively steady level in the gasification process. The content of L4 (sodium aluminosilicate) in raw coal was low.
· 2 Coal gasification 8 IEA CLEAN COAL CENTRE Gasification is a process by which coal can be converted into syngas (CO + H 2), that can then be used to produce a range of chemicals, either directly or via intermediates, such as methanol. Typically, 1 kg of bituminous coal can be converted into 1.5–1.7 m 3of syngas.
For the cases of coal, Kosminski et al. [55,56] have concluded that steam lowers the melting point of sodium carbonate, causing the reaction of liquid …
· Abstract Fly ash, a thermal power plant by-product is increasing and it is expected that this by-product will increase with increase in energy demand, especially in developing countries. Considering this, current study presents a novel process for the utilization of thermal power plant waste i.e., (fly ash) by fractionating it into silica particles and aluminum enriched residual ash ...
· Coal: social, environmental and economic concerns 9 Mining and preparation Key characteristics Capital cost 51.3-7155 M$ FOM cost - VOM cost 14.3-71.6 $/t
@article{osti_5692038, title = {Sodium corrosion of alloy 718 at 649 degrees C}, author = {Cowgill, M G}, abstractNote = {The effects of exposure of Alloy 718 to flowing sodium at 649{degree}C have been studied for times ranging from 4000 h to 20,000 h. Data are reported for metal loss, chemical composition changes, depth of intergranular attack and microhardness …
@article{osti_6366218, title = {Manual of methods: preservation and analysis of coal gasification wastewaters}, author = {Luthy, R. G.}, abstractNote = {One facet of a program for environmental assessment in the ERDA high BTU coal gasification program has been the development of a cost effective strategy for characterizing the composition of coal gasification wastewaters.
· Gasification - Versatile Solutions Overview of Gasification Technologies Global Climate and Energy Project Advanced Coal Workshop March 15, 2005 Gary J. Stiegel, Technology Manager - Gasification
· Laboratory experiments were conducted on samples of a prepared low-rank South Australian Lochiel coal, viz. Na + ion-exchanged acid-washed and physical impregnation of NaCl samples, to study the influence of gas atmosphere on the reactions between sodium with silica during pyrolysis in nitrogen and gasification with steam or carbon dioxide. . Additionally, …
@article{osti_7071596, title = {Molten salt coal gasification process development unit. Phase 1. Volume 2. Commercial plant study. Final report}, author = {Kohl, Arthur L.}, abstractNote = {This report summarizes the results of a test program conducted on the Molten Salt Coal Gasification Process, which included the design, construction, and operation of a Process Development …
· Reagent Chemical Na2CO3 Sodium carbonate (caustic soda), 50%, Na2CO3 kg 50%0.59 Reagent Chemical Na2Si3O7 Sodium silicate at 48%, Na2Si3O7 kg 0%0.71 Reagent Chemical Na2SiO3 Sodium silicate, spray powder 80%, Na2SiO3 kg 1.64