2011-4-29 Demineralization and desulfurization of coal may be achieved by both physical and chemical methods. Some demineralization can be achieved by simple physical processes based on the differences in the physical properties of the mineral and carbonaceous parts of the coal. Physical processes are cost effective methods but not effective in separation of the finely dispersed minerals and those bound to the coal structure. However, chemical method is known as being the solution for obtaining clean demineralized and desulfurized coal,
Coal desulfurization process A method for chlorinolysis of coal is an organic solvent at a moderate temperautre and atmospheric pressure has been proven to be effective in removing sulfur, particularly the organic sulfur, from coal. Chlorine gas is bubbled through a slurry of moist coal in chlorinated solvent.
2017-1-16 I Desulfurization of Coal Yasuo Ohtsuka ©Encyclopedia of Life Support Systems (EOLSS) temperature desulfurization process is well proven, the reduction of sorbent consumption is required to minimize the costs for sorbent and residue management. Flue gas desulfurization (FGD) removes the SO2 from the flue gas of coal-fired plants.
A process for coal desulfurization induces thermochemical, insitu, reactions between sulfur and other elements in the coal. Coal is pulverized to an approximate average diameter size within a range of about less than a centimeter to 4 centimeters.
Particularly, the combustion characteristics of coal were improved after desulfurization. Finally, the desulfurization mechanism was proposed. All these results indicated that the desulfurization process
2020-10-13 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.
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. The coal is separated by depressing the pyrite firstly, then the pyrite is activated and flotated.
In a solvent refined coal liquefaction process, more effective desulfurization of the high boiling point components is effected by first stripping the solvent-coal reacted slurry of lower boiling point components, particularly including hydrogen sulfide and low molecular weight sulfur compounds, and then reacting the slurry with a solid sulfur getter material, such as iron.
For pulverized coal, it is possible to use magnetic desulfurization in which pyrite is transformed into pyrrhotite. This enhances the magnetic susceptibility of the inorganic sulfur containing material. Other treatment processes include several chemical methods and biological leaching, which still needs development, but is very promising.
2010-6-24 Most of the effective coal desulfurization techniques are based on chemical methods. Main desulfurization methods are chemical desulfurization, leaching, extraction, flotation, oxydesulfurization and biodesulfurization.
Coal desulfurization process A method for chlorinolysis of coal is an organic solvent at a moderate temperautre and atmospheric pressure has been proven to be effective in removing sulfur, particularly the organic sulfur, from coal. Chlorine gas is bubbled through a slurry of moist coal in chlorinated solvent. The chlorinated coal is separated, hydrolyzed and the dechlorinated.
2020-10-13 Coal desulfurization and demineralization by chemical/physical treatments Chen-Wen Fan Iowa State University Follow this and additional works at:https://lib.dr.iastate.edu/rtd In this process, the coal is first leached with a dilute sodium carbonate solution under
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.
2020-9-22 The desulfurization process took place at a pH of 3–5, the coal-particle size was 75–45 μm, the pulp density was 5%, the temperature was 35°C, and the incubation time was 8 h. Chemical studies also revealed a decrease in the ash content and an increase in the calorific value of coal
2019-12-12 A coal desulfurization process via sodium metaborate electroreduction with pulse voltage using a boron-doped diamond thin film electrode. RSC Adv. 2013, 3 (5),1476-1485. DOI: 10.1039/C2RA21604C. Yafei Shen, Tonghua Sun, Jinping Jia. A novel desulphurization process of coal water slurry via sodium metaborate electroreduction in the alkaline
2010-6-24 Coal before utilization is subjected to some physical, chemical and biological desulfurization methods. However, physical and biological methods are ineffective and time consuming and they can be applied only on the bench scale. Most of the effective coal desulfurization techniques are based on chemical methods.
In this paper, the desulfurization of Fangshan coal was carried out by tetrachloroethylene extraction under ultrasonic and microwave irradiation. The GC-MS analysis of the tetrachloroethylene extraction reveals that organic sulfur in coal can be removed by tetrachloroethylene extract under ultrasonic and microwave irradiation. It is found that microwave irradiation time has great effect on
2020-1-21 FBC Desulfurization Process Using Coal with Low Sulfur Content 377 Brazilian Journal of Chemical Engineering Vol. 26, No. 02, pp. 375 383, April June, 2009 Table 2, and their chemical composition is shown in Table 3. Mean particle size (Table 2) was calculated by sieve retention, and using Sauter’s formula, given in
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.
2021-5-11 The removal of sulfur from coal is difficult for so many reasons, mainly for the complicated structures. Many technologies have been developed to clean coal for improving and encouraging the utilization of coal. Recently, biological process of desulfurization took a big step towards the development of clean coal technology.
2013-5-5 ation process. Acidity in the drainage water associated with coal mines or coal storage piles is the result of microbial oxidation of sulfur in coal producing sulfuric acid 1'2. This 'natural' micro- bial desulfurization of coal is al- most completely limited to the inorganic forms of sulfur (pyrites).
2020-1-21 FBC Desulfurization Process Using Coal with Low Sulfur Content 377 Brazilian Journal of Chemical Engineering Vol. 26, No. 02, pp. 375 383, April June, 2009 Table 2, and their chemical composition is shown in Table 3. Mean particle size (Table 2) was calculated by sieve retention, and using Sauter’s formula, given in
2020-10-13 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
2018-6-1 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.
2021-5-11 The removal of sulfur from coal is difficult for so many reasons, mainly for the complicated structures. Many technologies have been developed to clean coal for improving and encouraging the utilization of coal. Recently, biological process of desulfurization took a big step towards the development of clean coal technology.
2020-10-13 Coal desulfurization and demineralization by chemical/physical treatments Chen-Wen Fan Iowa State University Follow this and additional works at:https://lib.dr.iastate.edu/rtd In this process, the coal is first leached with a dilute sodium carbonate solution under
2018-5-7 an important role in this desulfurization process, which could serve as a reference for further optimizing the coal desulfurization process. 中文翻译： 过氧乙酸超声对煤脱硫机理的研究 这项研究报告探讨了利用超声波
Post-desulfurization of coal is desulfurization to remove sulfur in the gas from coal combustion. The desulfurization process can be carried out physically, chemically, and a combination of physical-chemical methods. The physical method uses adsorbents, and the
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.
2020-10-16 desulfurization process [1]. this method is only suitable for flue gas desulfurization of sulfur coal boilers in small and medium-sized power plants. Ammonia desulphurization is the reaction of ammonia or ammonia water with acidic SO 2 to produce (NH4) 2 SO 4. In the absorption tower, the absorption solution is mixed with the flue gas