Abstract.Coal is treated to remove both pyritic and organic sulfur by contacting with an aqueous solution comprising cupric ions at temperatures of about 140sup 0 c.-200sup 0 c.Under autogenic pressure, until substantial amounts of the sulfur are solubilized, separating the coal solids, and washing the solids with water to remove soluble forms of sulfur, iron and copper therefrom.
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The inorganic sulfur in hunan ningxiang high sulfur coal was first removed by chemical method, and then was used for organic sulfur removal by electrolysis in alkaline conditions.The influences of main factors for organic sulfur removal rate from the coal such as.
Sulfur removal from coal.The uninoculated control flask included 10ocoal particles of 100 to 150 mesh size in mineral salts medium.The initial ph of the control flask wasadjusted to ph2.5 with 0.1 nhci, and it was incubated with the other flasks.Evapora-tion losses were determined by measuring the liquid volumein thecontrolflaskevery24h.
Sulfur removal from coal kirkbride chalmer g.Oct 31 1978on pletion or substantial pletion of sulfur removal from coal according to the invention the desulfurized coal is recovered and the gas consisting primarily of hydrogen hydrogen sulfide water and ammonia is.
An asphaltenic residue from deasphalting a synthetic crude obtained by direct liquefaction of a subbituminous spanish coal was submitted to several upgrading routes.In this paper, the kinetics of sulfur-removal reactions in thermal, hydrothermal, and hydrocatalytic cracking are reported.The sulfur-removal reactions fit a 2.7 kinetic order for the thermal process, a 3.8 kinetic order for the.
Desulfurization of coal involves the removal of both the inorganic and organic forms of sulfur.Several physical methods are available for the removal of inorganic sulfur which is normally represented by pyritic and sulfatic sulfur.Removal of organic sulfur requires the use of chemical cleaning methods.
The results show that the silicate bacteria could be used to desulfurize high-sulfur coal.Total sulfur content was reduced from 5.45 to 3.45 after the treatment.The total sulfur removal rate reached 36.70,in which the effective removal rate reached 9.91.
Most sulfur removal of jx coal is distributed in tar under ar atmosphere, while it is distributed in gas phase under co2 atmosphere.The effects of ash on sulfur removal are different for different coals under both atmospheres.
Sulfur is a component of coal and other gasification feed stocks.Resulting sulfur compounds in syngas need to be removed in most gasification applications due to environmental regulations or to avoid catalyst poisoning.Whether it is electricity, liquid fuels, or some other product being output, sulfur emissions are regulated, and sulfur removal is important for this reason, along with the.
Evaluation of the removal of organic sulfur from coal abstract as the removal of sulfur from coal prior to combustion acquires more importance in order to meet evermore stringent antipollution regulations, research on the development of methods for the cleaning of coal continues to expand.
Introduction.Sulfur in coal is a contaminant.Over the past few decades, growing concerns over the detrimental effects of acid rain and sulfur oxide emission on the environment due to coal combustion have led to the development of methods for reduction of sulfur in coal prior to combustion.
The midwest ore processing co.Mwopc has reported a precombustion coal desulfurization process using perchloroethylene pce at 120 c to remove up to 70 of the organic sulfur.The purposes of this research were to independently confirm and possibly to improve the organic sulfur removal from.
Yunnan anthracite coal yn with high fes2, pingshuo coal ps with high organic sulfur and duerping coal dep with 33.52 organic and 64.20 inorganic sulfur were selected to investigate the effects of minerals and fe3 on sulfur release behavior during coal pyrolysis under ar and 3 o2ar atmospheres by pyrolysis connected with gas chromatogram py-gc combined with pyrolysis coupled with.
Is for removal of any form of s in coal.It acts as aqua regia because this solvent dissolves all types of sulfur present in coal for this case.Experimental scheme 50 g coal was taken in beaker and it was leached with 25 ml h2o2 and 60 ml h2so4 solvents.The system was agitated and heated for different intervals.
Molecules article research on the composition and distribution of organic sulfur in coal lanjun zhang 1,2, zenghua li 1,2,, yongliang yang 1,2, yinbo zhou 1,2, jinhu li 1,2, leilei si 1,2 and biao kong 1,2 1 key laboratory of coal methane and fire control, ministry of education, china university of mining and technology, xuzhou 221008, china junjunzhang11163.Com l.Z.
Sulfur removal from coal.Sep 7, 1977.A process for decreasing the sulfur content of coal is provided, which includes drying coal and subjecting the dried coal in a hydrogen atmosphere to the influence of wave energy in the microwave range.
The characteristic of sulfu occurrence in coal and sulfur removal by microbe technologyj.Coal preparation technology, 20041 4-8 in chinese.92yu hongguan, liu zechang, wang li, et al.A study on regularity about forms of sulfur evolution during coal.
An alternative method to sulfur removal from coal is to remove noxious gases from the stack gases, and although a great amount of time and money has been spent to develop a suitable process and equipment, only limited commercial success has been obtained.
Sulfur removal during combustion of solid fuels in a fluidized bed of dolomite clyde w.Zielke, howard e.Lebowitz, robert t.Struck, and everett gorin consolidation coal company sulfur removal during combustion of coal or low-temperature coal char using excess air in a fluidized bed of dolomite has been demonstrated in a continuous bench-scale.
Finely divided coal or coal derivatives, containing pyrite, are reacted with sulfurous acid the oxidizing agent if desired, hcl may also be used to improve the reaction efficiency to remove pyritic sulfur from coal as shown by the following equations primary oxidation - reduction 4 fes2 pyrite 3so2 12 hcl - 4 fecl3 11s 6 h2o secondary oxidation - reduction 4 fecl3 fes2.
Zhundong zd coal comes from the largest coalfield in the world with a reserve of 390 billion tons.However, the high content of sodium and calcium in zd coal causes severe fouling.Presently, no pulverized coal-fired furnace can burn zd coal alone.In this study, kaolin addition is proposed to address fouling in a full-scale furnace burning zd coal.
Sulfur k-edge xanes was carried out to study the sulfur transformation after thermolysis.For ps raw, deashed and depyrited coals, the order of effect of atmospheres on sulfur removal is 3 o 2 -ar co 2 85 co 2 -ar 75 co 2 -ar ar.
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