preload-image

process for removal of sulfur and ash from coal

New technology removes sulfur from coal By Susan Trulove Spectrum Volume 19 Issue 01 - August 29, 1996 A coal-cleaning technology developed by ia Tech in the early 1980s has generated new technologies and patents, including a process for doubling the amount of sulfur removed from coal compared to techniques currently used.

The Fig. 1 shows the effectiveness of the process in removal of the mineral matters (ash yield) and sulfur components from the two coal samples. It is observed that the present process of ODS is more effective for the SCF coal sample than that of B coal although they are from the same coalfield.

The application of microbial resources for removal of sulfur from coal is an ecofriendly technique and could be successfully employed at industrial scale after laboratory scale process optimization.

A process for the removal of divalent organic and inorganic sulfur compounds from coal and other carbonaceous material. A slurry of pulverized carbonaceous material is contacted with an electrophilic oxidant which selectively oxidizes the divalent organic and inorganic compounds to trivalent and tetravalent compounds.

@article{osti_5386247, title = {New process removes sulfur from coal before burning}, author = {Roy, K A}, abstractNote = {This paper reports on technology to eliminate sulfur dioxide emissions generated by burning coal stepped to the front of the line. A desulfurization process removes sulfur from coal before it is burned, eliminating or minimizing sulfur dioxide emissions, an acid rain ...

The full utilization of coal is limited by the presence of high levels of sulfur and ash in it. Therefore, removal of mineral matter and sulfur from coal prior to its utilization is necessary . Many researchers have tried to find an economically practical process for removing sulfur from coal, but no such process has been developed yet . 1.2.

PROCESS FOR REMOVAL OF SULFUR AND ASH FROM COAL ABSTRACT OF THE DISCLOSURE A process for reducing the sulfur and ash content of coal particles wherein coal particles are treated in an aqueous slurry with a minor amount of hydrocarbon oil to form coal-oil aggregates having modified particle size and density characteristics The coal-oil aggregates are separated from ash and mineral …

The combined effect of desulfurization and ash removal in the process of coal desulfurization by microwave with peroxyacetic acid was determined by evaluating variations in minerals and sulfur forms using X-ray diffraction and X-ray photoelectron spectroscopy. Dielectric properties of minerals or organic sulfur functional groups in coal were studied utilizing a vector network analyzer in the ...

The best removal of ash was observed by using 1 M bortrifluorid (BF3) solution at 250°C and 70 atm. Depending on the leaching conditions and coal used, reductions ranged from 5% to 36% in sulfur ...

392 Removal of sulfur and ash from coal using molten caustic leaching, a case study from Hazro fields, Turkey al, 2009). The high quality coal reserves in the world are gradually depleting and therefore, there is a growing interest to utilize the inferior grades of coal which usually

PROCESS FOR REMOVAL OF SULFUR AND ASH FROM COAL ABSTRACT OF THE DISCLOSURE A process for reducing the sulfur and ash content of coal wherein coal particles are treated in an aqueous slurry with a minor amount of hydrocarbon oil to form coal-oil aggregates. The coal-oil aggregates are separated from ash and mineral matter in the slurry by dissolved gas flotation.

According to the location of the removal process, arsenic removal technology from coal combustion can be divided into three categories: (A) pre-combustion removal, (B) removal during combustion, and (C) post-combustion removal. ... sulfur, moisture and ash content in blended fuels on the partitioning of arsenic during bituminous coal and ...

While there is much prior art relating to processes for removing sulfur and ash from coal, there remains a pressing need for a simple, efficient process for removing sulfur and ash from coal. SUMMARY OF THE INVENTION. This invention provides a practical method for more effectively reducing the sulfur and ash content of coal.

Different microorganism was reviewed for process of sulfur removal from coal. For effective removal of inorganic sulfur thiobacillus ferrioxidans had favorable for pyritic sulfur 90% and for ...

3. Coal Cleaning for Sulfur Removal The coal cleaning process has traditionally focused on reducing ash-reforming minerals and not necessarily aimed at removing sulfur in coal until recently. However, increasingly stringent regulations for SOx emissions during coal combustion have encouraged technical development of coal cleaning for sulfur ...

Coal is the most popular source of primary energy and the coal-fired power plants are still the main source of the demand for electricity in the world especially in China.With the wide exploitation of coal and the rapid progress of society,clean and efficient utilization of coal has become the most important task during coal utilization.The ...

The combination gravity and flotation methods demonstrate the technical feasibility of processing fine size coal to effectively remove sulfur and ash to recover high quality clean coal products which meet or exceed specifications for commercial grade coal as regards to Btu value, and ash and sulfur content. The process effectively removed over ...

----- Introduction Process Description The Battelle Hydrothermal (HT) Coal Cleaning Process is a method for desul- furizing coal. The process involves heat- ing an aqueous slurry of coal and a chemical leachant at moderate temper- atures and pressures to extract a signif- icant portion of the sulfur and some of the ash.

For leaching time of 60--180 min and temperatures of 370--400 C the effectiveness of MCL process of removal of individual components was as follows: 90--95% of pyritic sulfur, 70--90% of organic sulfur and 90--99% of ash. The MCL process was also effectively applied for …

2.2. Self-desulfurization of coal ash during combustion Most organic sulfur and pyrite in coal are oxidized and convertedtoSO 2 gas duringcombustioninfurnaces. Asmall part of the sulfur may be retained as solid compounds, due to the contribution of alkaline components such as CaO, MgO, Al 2O 3,Fe 2O 3,K 2O, Na 2O in coal ash. The alkaline sulfates

A process is described for reducing the sulfur and ash content of coal. It is comprised of: (1) contacting coal particles containing ash and iron pyrite mineral matter with a promoting amount of at least one conditioning agent which has a ferrous component maintained at a ph of from about 5.5 to 11.0 and is capable of modifying or altering the existing surface characteristics of the pyrite ...

Ambedkar et al. (2011a Ambedkar et al. (, 2011b studied the ultrasound-assisted process for sulfur and ash removal from coal, and they reported that the use of ultrasound appears to be a ...

A process for reducing the sulfur and ash content of coal comprising the steps of: (1) contacting coal particles containing ash and iron pyrite mineral matter with a promoting amount of at least one conditioning agent capable of modifying or altering the existing surface characteristics of the pyrite under conditions to effectuate alteration or modification of at least a portion of the ...

As this sulfur form composes nearly 30 percent of the overall sulfur content of Coal Creek's fuel, expectations are that the sulfur reduction associated with …

Nitrogen oxides (NOx) are the main pollutants of air, which mainly come from the combustion of coal and fossil fuels. In this paper, with fly ash used as the catalyst carrier, the effects on the denitration and sulfur resistance of Mn-Ce loading sequence and molar ratio were studied. The catalyst wa …

During process of combustion harmful gases emitting due to ash and sulfur contain in it had negative e ff ct on environment as well as coal associated plants. R e earcher attracted by removal of sulfur and ash fr om coal regarding environmental problem. Current research p aper reviews different microorganism for bio-treatm ent of coal.

Removal of Organic Sulfur from Coal by Wheat Straw Ash and Potassium Ferric Hexacyanoferrat (II) Ayhan Demirbas,1 and Selami Karslioglu 2 1Department of Chemical Engineering, Selcuk University, Campus, 42031 Konya, Turkey 2Department of Chemistry, Karadeniz Technical University, Trabzon, Turkey ABSTRACT This study is an attempt to desulfurize organic sulfur from coal samples with

more effective in removing the pyritic sulfur from the coal, which is the less abundant form than the organic sulfur. Lignite and coal samples from Turkish resources were extracted with an aqueous alkaline solution obtained from the water-soluble fraction of biomass ash. …

scale laboratory experiments for the production of super clean coal with both a low-ash content and a low-sulfur content. In this process, the coal is first leached with a dilute sodium carbonate solution under oxygen pressure at 150°C to oxidize pyritic sulfur and some of the organic sulfur to produce water-soluble sulfur species.

A process for reducing the sulfur and ash content of coal particles wherein coal particles are treated in an aqueous slurry with a minor amount of hydrocarbon oil to form coal-oil aggregates having modified particle size and density characteristics. The coal-oil aggregates are separated from ash and mineral matter in the slurry by gravitational means.

Newsleter

Back-To-Top
Choose Your Color