To reduce the risk of spontaneous combustion during coal storage and transportation, microbial desulfurization technology is used to reduce the content of inorganic sulfur in coal. A strain of Aciditithiobacillus ferrooxidans was purified from coal mine water in Datong, Shanxi Province, and its desulfurization test conditions were optimized. Taking the inorganic sulfur removal rate of coal as ...
Coal combustion is the largest single source of sulfur oxide pollution. Treatment of some major representative coals with aqueous ferric solution removes 40 to 75 percent of the sulfur content through near quantitative oxidation of the pyritic sulfur contained in the coal matrix. Elemental sulfur and iron sulfate are recovered as products ...
The second part examines recent advances in desulphurization techniques and future challenges for commercial, that are being researched around the world and are regulating the manufacture of a new ...
Sulfur in coal exists in inorganic and organic forms, the former being mostly pyritic sulfur. Total sulfur contents in major coalfields are in the range of roughly wt%. 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 ...
Nonetheless, it is the preferred process for coalfired 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). SemiDry Systems Semidry systems, or spray dryers, inject an aqueous sorbent slurry similar to a wet system, however,
Within 30 days, it was possible to reduce the pyrite sulfur content in coal samples by 8595% and the total sulfur content by 3151%. The microorganisms were cultured on a solid nutrient medium, the process of coal desulfurization proceeded at a temperature of 30°C, the pulp density was 10%, and the coal particle size was 74 μm.
The oxidation process of coal conversion is possible by microorganisms after getting influenced by the polyfunctional coal structure and this process usually ... Beyer, M., Ebner, H. G., Klein, J. (1986). Influence of pulp density and bioreactor design on microbial desulphurization of coal. Applied Microbiology and Biotechnology, 24 ...
The seawater desulfurization process includes the following three steps. (1) Absorption: the seawater contacts and absorbs the flue gas in the packed tower, and the pH of the seawater after absorption is 23. (2) Oxidation: dilute with fresh sea water and introduce aeration to oxidize sulfite.
In the engineering smelting flue gas, the concentration of SO 2 is about 2000 ~ 3000 mg·m −3, the temperature of flue gas is about 90 ℃, and the solidliquid ratio of carbide slag slurry is 1:10. Fourstage desulfurization process is adopted in the project. Carbide slag slurry is used to remove SO 2.
During the project of the technical transformation of a 75t/h CFB boiler, the desulphurization rate, the utilization ratio of CaO, the sintered ratio of CaO, etc. can be got, by the calcium conservation and sulfur conservation according to the analysis of coal and...
The coal hydrogen production process requires hightemperature steam as a reactant. Coalfired boilers are usually used to provide hightemperature steam. The ammoniabased desulphurization process is an effective technology to remove SO2 in the coalfired flue gas. However, the mass transfer coefficient of SO2 in such an engineered process is not readily available in the literature. In this ...
Optimization Mechanism of Permeability Response Behavior of Fine Coal. The absorption process of microwave energy in fine coal is a kind of electromagnetic response process. The electromagnetic wave energy was converted into heat energy so that the microwave energy would be absorbed through dielectric and magnetic losses.
This work was conducted through field tests on a coalfired circulating fluidized bed boiler with a condensation scrubber (CS) for flue gas waste heat recovery installed behind the wet flue gas desulfurization (WFGD) scrubber. Levels of multiple pollutants were investigated along the various flue gas devices of the boiler, with the CS being the ...
The process of bacterial coal desulfurization led to increase in calorific value showing advantage over conventional treatment methods. ... Effect of native bacteria Sinomonas flava 1C and Acidithiobacillus ferrooxidans on desulphurization of Meghalaya coal and its combustion properties. Fuel, 117 (2014), pp. 415421.
In the process of use, highsulfur coal will produce many sulfurcontaining substances, resulting in acid rain, haze and other pollution to the ecological environment (Chen et al., 2019). Coal cleaning technology has become a key link to control environmental pollution caused by coal burning (Yue et al., 2021).
In the flue gas ammonia desulfurization process of the coal chemical industry, ammonium sulfate slurry in the desulfurization tower often foams and overflows, which wastes resources and pollutes the environment. The solution to this problem remains largely unknown. This paper aims to reveal the causes of foaming by analyzing foam composition, ammonia desulfurization process raw material source ...
The wet flue gas desulphurization has been the most widely used in the coalfired power plants because of high SO 2 removal efficiency, reliability and ... Meanwhile, the desulphurization process in the PCF device was analyzed using the twofilm theory of gasliquid masstransfer. The results show that the PCF device has low pressure drop ...
How to reduce the energy consumption of the rotary kilnelectric furnace (RKEF) process has become an important issue for the stainless steel industry. The aim of this study is to reduce the energy consumption of ferronickel production from saprolite nickel laterite in the RKEF process. The effects of the slag binary basicity, FeO content, and Cr2O3 content on the melting temperature and ...
In this study, coal fly ash was functionalized, using a simple onestep process (loading with Al3+ and sulfonation), to yield a solid acid catalyst (S/AlCFA) with strong acid sites. The catalyst was then used to produce furfural from xylose in a biphasic system (H2O(NaCl)/tetrahydrofuran). The furfural yield reached 82% at 180 °C60 min with catalyst/xylose ratio of : (w/w).
To further remove the total sulfur, this study applied the electrolysis process of coal in aqueous sodium chloride and sodium hydroxide (NaOH) solutions. The changes of sulfur forms were confirmed ...
Most of the effective coal desulfurization techniques are based on chemical methods. 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 abundant form ...
Therefore, exhaust gas from burning process with high sulphur coal must be treated by installations for removal of SO 2. Due to the high cost of these installations and under the increasing limitations of SO 2 emissions, predesulphurization of coal is essential.
In this paper, a twostep desulfurization process for highsulfur coal was investigated. Two Chinese coals with the addition of 10 wt % potassium hydroxide or sodium hydroxide were pyrolyzed under an atmosphere of nitrogen or hydrogen in a fixedbed reactor at 600 °C, and then the obtained chars were washed with hot water. The results indicated that, without the addition of an alkali ...
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