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coal desulfurization process:

Desulfurization of Coal - EOLSS

In coal combustion, to generate electric power and process heat, the sulfur is emitted as SO2, which is seen as one of the main causes of acid rain. This effect has led to an interest in the three main methods of removing coal sulfur: coal cleaning, in-bed desulfurization, and flue gas desulfurization. Coal cleaning includes physical, chemical,

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Process for desulfurization of coal (Patent) OSTI.GOV

Desulfurization and demineralization of coal utilizing the TRW Gravimelt Process results in two major process streams requiring solid-liquid separation. In the production of clean coal, the caustic and caustic-soluble reaction products are removed from the coal, in a sequence of steps involving the washing of coal-caustic cake with dilute ...

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Coal Desulfurization via Different Methods: Energy Sources ...

Jun 24, 2010  Main desulfurization methods are chemical desulfurization, leaching, extraction, flotation, oxydesulfurization and biodesulfurization. The alkaline desulfurization is more effective in removing the pyritic sulfur from the coal, which is the less

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COAL DESULFURIZATION: - Chemical Engineering

This book was written to provide a comprehensive survey of the current state of the art in coal preparation, with particular emphasis on coal desulfurization. Such a book has not been available since Robert Meyers wrote Coal Desulfurization in 1977, and considerable advances have been made in the more than 20 years since then.

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Process for coal desulfurization - ZAVITSANOS; PETER D.

A process for desulfurization of carbonaceous aggregates as recited in calim 4 further comprising: (a) generating thermal energy from said microwave energy to desulfurize coal at a rate of about 0.3 - 1% of a heating value of said coal, wherein said generated energy liberates said sulfur with little loss of said heating value of said coal. 6.

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Coal Desulfurization by Solvent Leaching Methods

Coal desulfurization prior to usage is a preprocessing in order to achieve clean fuel and reduce environmental impacts such as acid rain. Desulfurization of Lakhra (Pakistan) coal was conducted with different solvents. Coal was leached with different solvents like hot water, H 2 O 2 /H 2 SO 4 and HNO 3

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Process for desulfurization of coal (Patent) OSTI.GOV

Desulfurization and demineralization of coal utilizing the TRW Gravimelt Process results in two major process streams requiring solid-liquid separation. In the production of clean coal, the caustic and caustic-soluble reaction products are removed from the coal, in a sequence of steps involving the washing of coal-caustic cake with dilute ...

Read More
COAL DESULFURIZATION: - Chemical Engineering

This book was written to provide a comprehensive survey of the current state of the art in coal preparation, with particular emphasis on coal desulfurization. Such a book has not been available since Robert Meyers wrote Coal Desulfurization in 1977, and considerable advances have been made in the more than 20 years since then.

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Fluidized Bed Coal Desulfurization

of coal desulfurization in a gas fluidized bed reactor as compared to the chlorinolysis process employing coal-water slurries. Results of the studies indicate that: (1)the two coals studied could be. desulfurized to approximately the same levels achieved in the chlorinolysis. process by reacting dry coal in a sequential manner with chlorine ...

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Coal desulfurization (Book) OSTI.GOV

Process operating temperatures of 50 to 130C, pressure of 1 to 10 atm, residence times of 1 to 16 hrs, and coal top sizes from 1/4-in. to 100 mesh were evaluated. Preliminary process design and cost estimation for a 100-ton/hr coal desulfurization plant are given. (GRA) « less. Review of coal desulfurization.

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Meyers Process Development for Chemical Desulfurization of ...

11. Despite the adverse effect of coal particle size on pyrite leaching rates, coarse ROM coal desulfurization by the Meyers Process is feasible. Pyrite reduction in excess of 80 percent was attained when 1/4 inch x 0 ROM L.K. coal was leached for 48 hours with ferric sulfate solution at 102°C.

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Air Pollution Control Technology Fact Sheet

waste. Nonetheless, it is the preferred process for coal-fired electric utility power plants burning coal due to the low cost of limestone and SO 2 control efficiencies from 90% up to 98% (Schnelle, 2002). Semi-Dry Systems Semi-dry systems, or spray dryers, inject an aqueous

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Coal Desulfurization By A Microwave Process – PDF Download

Coal Desulfurization by a Microwave Process Technical Progress Report February 1981 May 1981 1981 Ash analyses on these samples showed as high as 40% reduction.

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Flue-Gas Desulphurization - an overview ScienceDirect Topics

Nicholas P. Cheremisinoff, in Clean Electricity Through Advanced Coal Technologies, 2012 2.5 Flue-Gas Desulfurization Material. Flue-gas desulfurization (FGD) material is a product of a process typically used for reducing SO 2 emissions from the exhaust gas system of a coal-fired boiler. The physical nature of these materials varies from a wet sludge to a dry, powdered material depending on ...

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What is Desulfurization? (with pictures)

Also known as hydrodesulfurization or HDS, this chemical process reduces the sulfur dioxide emissions and converts them to sulfuric acid. The sulfuric acid is then used in car batteries and fertilizer. The most commonly required desulfurization process is in natural gas. Additional desulfurizing is required for flue gas, coal, and oil.

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Treatment of industrial wastewater produced by ...

Nov 01, 2018  The wet limestone-gypsum FGD process is most widely utilized owing to its high desulfurization efficiency and reliability (Srivastava and Jozewicz, 2001; Srivastava et al., 2001). In the combustion process with coal, SO 2 as acid gas is produced.

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Flue-gas desulfurization - Wikipedia

Flue gas desulfurization scrubbers have been applied to combustion units firing coal and oil that range in size from 5 MW to 1500 MW. Scottish Power are spending £400 million installing FGD at Longannet power station, which has a capacity of over 2 GW. Dry scrubbers and spray scrubbers have generally been applied to units smaller than 300 MW.

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US4076607A - Process for coal desulfurization - Google Patents

A process for coal desulfurization generates extremely low amounts of heat from microwave energy to induce thermochenical, in-situ, reactions to liberate sulfur in the form of stable gaseous species, such as H 2 S, COS and SO 2 .

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US5350431A - Process for chemical desulfurization of coal ...

A process for chemical desulfurization of coal, in which coal is brought into contact with a desulfurizing agent after or while the coal is irradiated with ultraviolet light, thereby to give remarkably high desulfurization ratios and remarkably high yields of low sulfur coal.

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Coal desulfurization in a fluidized bed reactor ...

Fluidized bed reactor technology was investigated as a means of developing a new simple and low cost process for coal desulfurization. Preliminary experimental results obtained in a 2.54 cm batch fluidized bed reactor have shown that over 80% total sulfur reductions can be achieved by sequential chlorination and dechlorination ...

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COAL DESULFURIZATION: - Chemical Engineering

This book was written to provide a comprehensive survey of the current state of the art in coal preparation, with particular emphasis on coal desulfurization. Such a book has not been available since Robert Meyers wrote Coal Desulfurization in 1977, and

Read More
Fluidized Bed Coal Desulfurization

of coal desulfurization in a gas fluidized bed reactor as compared to the chlorinolysis process employing coal-water slurries. Results of the studies indicate that: (1)the two coals studied could be. desulfurized to approximately the same levels achieved in the chlorinolysis. process by reacting dry coal in a sequential manner with chlorine ...

Read More
Coal desulfurization with sodium hypochlorite

The disadvantage of the use of aqueous chlorine in the Chlorinolysis process is that it chlorinates the coal matrix extensively and that treatment at a high temperature (500°C) is needed to restore the chlorinated coal. The cost of this treatment is high so that the entire desulfurization process with aqueous chlorine would not be feasible for

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Meyers Process Development for Chemical Desulfurization of ...

11. Despite the adverse effect of coal particle size on pyrite leaching rates, coarse ROM coal desulfurization by the Meyers Process is feasible. Pyrite reduction in excess of 80 percent was attained when 1/4 inch x 0 ROM L.K. coal was leached for 48 hours with ferric sulfate solution at 102°C.

Read More
Desulfurization Process of High-Sulfur Coal by Full ...

The coal sample from the Shijiazhai mine located in the east of Yunnan province of China, is characterized with high ash and sulfur content which are 64.90% and 8.66% respectively. Analysis results indicate that coal and pyrite are the valuable minerals that can be recycled from the crude ore. According to the properties of the ore, a full-flotation flowsheet is proposed to process the ore.

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The Flue Gas Desulfurization Process: Staying ELG ...

The Flue-Gas Desulfurization (FGD) process utilizes a set of technologies to remove sulfur dioxide (SO 2) from the flue gas emissions of coal-fired power plants.FGD systems were developed as a response to the exhaust – flue gases – from fossil fuel-burning plants, principally coal-burning, that posed both an environmental and human health hazard.

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Flue-Gas Desulphurization - an overview ScienceDirect Topics

Nicholas P. Cheremisinoff, in Clean Electricity Through Advanced Coal Technologies, 2012 2.5 Flue-Gas Desulfurization Material. Flue-gas desulfurization (FGD) material is a product of a process typically used for reducing SO 2 emissions from the exhaust gas system of a coal-fired boiler. The physical nature of these materials varies from a wet sludge to a dry, powdered material depending on ...

Read More
What is Desulfurization? (with pictures)

Also known as hydrodesulfurization or HDS, this chemical process reduces the sulfur dioxide emissions and converts them to sulfuric acid. The sulfuric acid is then used in car batteries and fertilizer. The most commonly required desulfurization process is in natural gas. Additional desulfurizing is required for flue gas, coal, and oil.

Read More
Coal Desulfurization By A Microwave Process Technical ...

Coal Desulfurization by a Microwave Process Technical Progress Report February 1981 May 1981. 1981. Ash analyses on these samples showed as high as 40% reduction. The calorific value was increased in almost all samples. Data on sulfur, ash and calorific values are summarized. Author: Publisher: ISBN: OCLC:1065747746.

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Treatment of industrial wastewater produced by ...

Nov 01, 2018  The wet limestone-gypsum FGD process is most widely utilized owing to its high desulfurization efficiency and reliability (Srivastava and Jozewicz, 2001; Srivastava et al., 2001). In the combustion process with coal, SO 2 as acid gas is produced.

Read More
MICROBIAL DESULFURIZATION OF COAL: Fuel Science and ...

A cost analysis for a tow-step process, which was designed to achieve complete removal of inorganic sulfur and a 40% reduction of organic sulfur, yieded $11 per ton of coal. These are lower than the costs of other techniques, e.g. $20–40 per ton of coal for flue-gas desulfurization.

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The microbial desulfurization of coal

The chemical structure of coal macerals is usually characterized by the presence of inorganic and organic sulfur. Inorganic sulfur consists mostly of iron sulfides, the so-called "pyritic sulfur," whereas organic sulfur is covalently bound to the carbon atoms of the coal macromolecule. Comminution o

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Analysis of CO2 Emissions in the Whole Production Process ...

The coal was washed by the coal jigging method until the mass fraction of sulfur in coal was lower than 1%, and then the coal was sent to the power plant to be blended. The coal-fired power plant was also equipped with wet flue gas desulfurization (WFGD), selective catalytic reduction (SCR), and bag-hose precipitation devices.

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Desulfurization - Wikipedia

Desulfurization or desulphurisation is a chemical process for the removal of sulfur from a material. This involves either the removal of sulfur from a molecule (e.g. A=S → A:) or the removal of sulfur compounds from a mixture such as oil refinery streams.These processes are of great industrial and environmental importance as they provide the bulk of sulfur used in industry (Claus process and ...

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