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combustion process which exits from the outlet was analyzed using Gas Combustion and Emission Analyzer (E4400, E-Instrument). Mercury metal residues in the bottom ash were analyzed using NIC Mercury SP Analyzer. An increasing zeolite adsorbent SO2 content in flue gas decreased. The optimum SO2 removal was determined on 4% zeolite adsorbent ratio.
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A process for reducing the amount of free and combined sulfur, such as pyritic, organic or elemental sulfur in coal; removing of these sulfur species may be made in an acid, basic or neutral solutions; at least 50 percent and up to 90 percent of sulfur, by weight, originally present in coal may be removed.
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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.
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Low-sulfur coal generally contains 1 percent or less sulfur by weight. For air quality standards, "low sulfur coal" contains 0.6 pounds or less sulfur per million Btu, which is equivalent to 1.2 pounds of sulfur dioxide per million Btu. Metallurgical coal (or coking coal) meets the requirements for making coke. It must have a low ash and sulfur ...
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The process comprises hydrogenating the coal to remove at least a portion of the recoverable sulfur combined as pyritic sulfur. The hydrogenated coal is subsequently contacted with a sufficient amount of an aqueous inorganic acid solution to remove at least a portion of the remaining sulfur initially combined as pyritic sulfur. Inventors:
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Ash reduction ranged from 9.5 to 20.6% and sulfur reduction from 17.6 to 25.6%. An optimum water pressure of 14 kPa (gauge) gives a reduction in E value of 28.2% at a CV loss of 12.1%.
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The key step in removing SO2 from the stack gas is the reaction of SO2 with CaO and oxygen to produce CaSO4, an insoluble stable compound. Four major components of the process will be traced the coal-limestone-stack gas streams, the scrubber water, the cooling-heating water cycle, and the generated steam cycle.
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99/01233 The removal of organic sulfur from two Turkish lignites by chlorinolysis : Kadioglu, Y. Y. et al. Turk. J. Chem., 1998, 22, (2), 129-136
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removal sulfur,ash coal processing. For coals finer than mm, themon separation process used is froth flotation. This process is very efficient Fuel 1997 Volume 76 Number 13 1187 S removal by fine coal cleaning processes: F. Rubiera et al. for removal of ashforming minerals and is being enhanced by the introduction of column flotation, which is ...
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Conversion and sulfur removal of coal in sub- and supercritical water was studied in a micro reactor in the temperature range of 340-400°C and water density 0-0.27 g/cm3 for 0-90 min under N2 atmosphere. The experiments were conducted to investigate the effect of reaction temperature, pressure, time and density of water on the sulfur removal in gaseous and liquid effluents, respectively.
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Dec 1, 2021In addition, KOH + oak ash liquid mixtures were used for desulfurization to determine the effect of chemicals. For Sorgun coal, the highest total sulfur and pyritic sulfur removal with oak ash were...
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The amount of sulfur trioxide produced in any given situation is influenced by many variables, including excess air level, concentration of sulfur dioxide, temperature, gas residence time, and the presence of catalysts. Vanadium pentoxide (V 2 O 5) and ferric oxide (Fe 2 O 3), which are commonly found on the surfaces of oil-fired boilers, are ef-fective catalysts for the heterogeneous ...
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OSTI.GOV Patent: Process for removal of sulfur and ash from coal. Process for removal of sulfur and ash from coal. Full Record; Other Related Research;
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Furthermore, using the above-mentioned data, B. subtilis was used in the flotation of coal for removal of sulfur and ash impurities. The flotation results showed that the flotation using B. subtilis can remove more than 70 % of sulfur and ash content in the feed. The final concentrate has 0.9 and 1.95 % sulfur and ash, respectively.
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In the work, sulfur-containing sorbents were employed to remove elemental mercury (Hg 0) from coal-fired flue gas.The work used the thermogravimetric analysis, Brunauer-Emmett-Teller method, scanning electron microscopy with energy-dispersive spectroscopy, X-ray diffraction, and X-ray photoelectron spectroscopy to characterize the physicochemical properties of the sorbents.
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Today, air-pollution regulations require that ROM coal be cleaned not only of ash and rocks but of sulfur as well. The processing of raw coals at levels 2, 3, and 4 therefore requires a maximized recovery of several characteristics (e.g., ash content, heating value, and sulfur content) in the respective product streams (i.e., clean coal and the ...
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Removal of sulfur dioxide by calcium-based materials from different sources in south Africa, the 8th Asia-Pacific international symposium on combustion and energy utilization, Sochi (Russian Federation), pp. 10-12. Liu, C. F. Shih, S. M. and Lin, R. B. (2002). Kinetics of the reaction of ca (oh) 2/fly ash sorbent with SO2 at low temperatures. Chem.
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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 ...
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The intensive implementation of ultra-low emission (ULE) at coal-fired power plants (CFPPs) in China has expedited comprehensive improvements in the air pollution control, especially the reduction of particulate matter (PM), sulfur dioxide (SO 2) and nitrogen oxides (NO x) (Ni et al., 2018).However, sulfur trioxide (SO 3) which have various negative impacts on human health and ecological ...
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As discussed above, there are a lot of methods to remove sulfur from coal, but we selected pre-combustion desulfurization by solvent leaching method (see figure-1). Sample: Lakhra (Pakistan) Coal Table 1: Proximate Analysis Moisture 7±0.5% Volatile Matter 36±1% Ash 37±1% Fixed Carbon 20±2% Table 2: Form of sulfur in coal
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Mineral and sulfur removal from the recovered coal was negligible. Further treatment with TCLP solvents in the second stage showed significant removal from the recovered coal (over 70%) of iron, manganese, and sodium. Sulfur and calcium removal was poor (less than 50%); it is likely that these are bound in the organic matrix.
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the removal of ash and sulfur from Arguvan lignite 66 force to drain the slurry as a thin flowing film at its wall. The heavier particles are retained inside the bowl while the lighter minerals flow out with the fluid [10, 11]. There are some studies on the removal of coal from ash and sulfur by gravity methods. Özgen et al. (2011)
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A process for reducing the sulfur and ash content of coal wherein coal particles are treated with a conditioning agent in an aqueous slurry prior to agglomeration with a minor amount of hydrocarbon oil.
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11.10 Coal Cleaning 11.10.1 Process Description1-2,9 Coal cleaning is a process by which impurities such as sulfur, ash, and rock are removed from coal to upgrade its value. Coal cleaning processes are categorized as either physical cleaning or chemical cleaning. Physical coal cleaning processes, the mechanical separation of coal from its ...
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A medium-sized coal washing plant is processing an annual capacity of 450,000 tons to 900,000 tons. ... The coal washer removes impurities from the raw coal, reduces ash and sulfur, improves coal quality, and meets the needs of users. ... mechanically remove impurities in the raw coal in the coal preparation plant and divide it into products of ...
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The coal low temperature ash contains kaolinite, illite, quartz, calcite, pyrite, and to a lesser extent, chlorite, plagioclase, dolomite, ankerite, and apatite. The concentration anomalies of Ga and Li in No. 5−2 high-sulfur coal were not caused by the Benxi Formation Bauxite, but by the influence of multiple geological factors.
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The effects of the 0il:coal ratio, the temperature, and the reaction time on organic sulfur removal is very complicated. In the absence of UV irradiation, for example, at 75" C and 100" C, higher 0il:coal ratios (1 : 1 and 1 : 10) remove more sulfur than the lower 0il:coal ratio (1 : loo), and 18 hr and 5 hr reactions remove more sulfur than a ...
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fly ash, 18 million tons of bottom ash, and 2 million tons of boiler slag. 1 Formation and Physical Characteristics The physical and chemical propenies of coal ash are determined by reactions thar occur during the high-temperamre combustion of the coal and subsequent cooling of the flue gas. A consider
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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.
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With its contribution to acid rain and the formation of fine particulate matter, the removal of SO 2 continues to be one of the most important environmental issues and financial challenges facing the coal-fired power industry and coal-fired boiler operators worldwide.. With tightening National Ambient Air Quality Standards (NAAQS), the Cross-State Air Pollution Rule (CSAPR), Regional Haze, and ...
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The process for pyritic sulfur removal has been tested using a ferric salt [Fe2(SO4)3 or FeC13] in solutions in which the coal was treated at 50 to 130 C and at pressures of 1 to 10 atm, with residence times of 1 to 16 hours and with the top coal size ranging from 1/4" to 100 mesh. Results on 4 coals showed removal of the pyritic sulfur with ...
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The U.S. Department of Energy's Office of Scientific and Technical Information
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soluble fraction of biomass ash. By this method, high sulfur removal from lignites was possible. The effect of temperature, the amount of biomass ash used, extraction ... This process removed 33.1, 35.3 and 37.2 % of total sulfur contents; 52.3, 53.6 and 60.7 % of pyritic sulfur contents; and 4.6, 22.1 ... Lignite- 1 Lignite-2 Lignite-3 Coal-1 ...
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The 0.5−0.125 mm fraction coal was chosen to study the separation process. The ash content of the coal was 36.21%, and its sulfur content reached 2.82%. The coal was obviously of high sulfur content. The schematic of experimental system is shown in Figure 1. The system included air supply and separation systems.
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Coal ash includes a number of by-products produced from burning coal" (Coal Ash Basics (EPA), 2015). This coal ash can either be stored in a dry state or put into basins and mixed with water and held in a coal ash pond. The issue lies with the storing of the ash in the basins as a water mixture. Coal ash contains heavy metals such as arsenic ...
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Abstract. A description is given of a method and apparatus for reducing sulfur and ash content of a solid material containing coal to a commercially usable product or to a commercially improved product by treating a pre-crushed and pre-screened quantity of the starting material in a size range of 1/sup 1///sub 4/ x 0 inches; the so-crushed and so-screened starting material is fed through a ...
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Flue gas pretreatment 2. SO2 absorption 3. Solids separation and drying 4. MgSO3 regeneration Sulfur dioxide processing may be considered a fifth step because it is often associated with the MgO FGD process. ... • Fly ash from coal contains com- pounds of vanadium and iron, which catalyze the undesirable reaction of magnesium sulfite with ...
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OSTI.GOV Journal Article: Wet processes for sulfur removal from coal gas. [Review of 4 oxidation processes, 3 neutralization processes, and 1 physical process for removal of H/sub 2/S] ... [Review of 4 oxidation processes, 3 neutralization processes, and 1 physical process for removal of H/sub 2/S] Full Record; Other Related Research;
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2.2. Experimental System. The experimental system is shown in Figure 1.Due to the higher content of chlorine in biomass fuels, it mainly exists in the form of HCl in the combustion process, and sulfur in the coal is almost completely oxidized to SO 2.Therefore, this experiment mainly investigates corrosion characteristics of ash deposits under the coexistence atmosphere of sulfur chlorine in ...
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Processing and Transporting Coal. After coal comes out of the ground, it typically goes on a conveyor belt to a preparation plant that is located at the mining site. A "prep" plant cleans and processes coal to remove dirt, rock, ash, sulfur, and other impurities. Removing the impurities increases the heating value of coal.
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