Circulating fluidized bed (CFB) boilers with wet flue gas desulfurization (WFGD) system is a popular technology for SO2 removal in the coalfired thermal power plant. However, the long response time of continues emission monitoring system (CEMS) and the hardness of continuously monitoring the coal properties leads to the difficulties for controlling WFGD. It is important to build a model that ...
Fly ash, which is a solid waste from coal power plants, was used as a precursor to prepare a zeolitetype adsorbent. This fly ashbased zeolite (Gismondine) was active for desulfurization of a model feed of TH (500 ppm S) and BT (500 ppm S) with 43% and % sulfur removal efficiency [125]. Dolochar is a waste byproduct of the sponge iron ...
Solid Wastes. Nicholas P. Cheremisinoff, in Clean Electricity Through Advanced Coal Technologies, 2012 FlueGas Desulfurization Material. Fluegas desulfurization (FGD) material is a product of a process typically used for reducing SO 2 emissions from the exhaust gas system of a coalfired boiler. The physical nature of these materials varies from a wet sludge to a dry, powdered material ...
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.
article{osti_, title = {Coal desulfurization}, author = {Meyers, R A and Van Nice, L J and Santy, M J}, abstractNote = {The Meyers process of removing pyritic sulfur from coal chemically before it is burned is presented. The process involves the treatment of crushed coal with an aqueous leaching solution of ferric sulfate which reacts with the coal pyrites to yield soluable ferrous ...
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 ...
In the process of coal mining, prevention and control of water hazard is essential. It is the precondition for water hazard control to detect and determine the distribution of underground waterconducting channels. In urban environments, traditional methods such as active source seismic exploration and transient electromagnetic exploration commonly used in the field are difficult to carry out ...
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 ...
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.
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.
The major coal desulphurization technologies prior to combustion are physical coal cleaning, chemical and biological methods. Each has some technical and economical limitations. Physical coal cleaning can only remove limited amount of inorganic sulphur due to insufficient liberation. Fine grinding can liberate fine pyrites, where novel coal ...
For the coal pyrolysis process, unstable sulfur compounds will decompose, generate sulfur radicals and release as sulfurcontaining gases, this becomes the main pathway for sulfur removal. Coal properties, minerals and sulfur forms in coal, and pyrolysis conditions such as temperature, atmosphere, and the mass transfer, are the main factors ...
Fine particles characteristics of ultralow emission coalfired power plants. Yongsheng Zhang, in Advances in UltraLow Emission Control Technologies for CoalFired Power Plants, 2019. Upgrading function and difficulty of WFGD removing PM Wet Desulfurization Technology (WFGD) is the main process for flue gas desulfurization in coalfired power plants in China, mainly including ...
Flue gas desulfurization gypsum (FGDG) is an industrial byproduct generated during the flue gas desulfurization process in coalfired power plants. Due to its abundance, chemical and physical properties, FGDG has been used in several beneficial applications. However, during the past decade, the rate of beneficially used FGDG has gradually ...
Desulfurization is the removal of sulfur or sulfur compounds (as from coal or flue gas), mostly from fuels. The most commonly required desulfurization process is in natural gas, but it is also required for flue gas, coal and oil. Sulfur in crude oil, natural gas, process gas and natural gas liquids (LNG) may take many forms, including hydrogen ...
During research, desulphurization process has several coal parameters like ash%, VM% and FC% change. The variations of ash% through desulphurization process are shown in Figure 5. From Figure 5, it has been observed that the ash content of coal is growing with increase in contact time and KOH concentration. For 10% KOH solution, the ash% is ...
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.
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 selectivity of a facile reductive and extractive desulfurization process was studied. In this desulfurization method, polyethylene glycol was used as the extractant, and sodium borohydride was ...
The occurrence of sulfur in coal direct liquefaction residue affects its further high quality and high value utilization. Electrochemical desulfurization is characterized by mild reaction conditions, simple operation, easy separation of sulfur conversion products and little influence on the properties of the liquefied residue. An anodic electrolytic oxidation desulphurization experiment was ...
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 ...
Flue gas desulfurization (FGD) processes have been widely used since the early 1970's for control of sulfur dioxide emissions from coalfired power plants. First generation FGD systems employ ''wet processes'' whereby the flue gas is contacted with a solution or slurry of an alkali reagent. Most of these installations use either lime or limestone.
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...
A novel method for the chemical desulfurization of coal in relatively moderate conditions and short times is presented. Using concentrated hydroiodic acid as a desulfurizing agent and microwaves as the energy source, sulfate and pyritic sulfur are completely removed in 10 min. Moreover, for the lowrank coals studied, variable amounts of organic sulfur, up to 70% in 20 min, can be removed, for ...
A series of mesoporous xLayMn/KIT6 sorbents with different La/Mn atomic ratios were fabricated by a solgel method and their desulphurization properties in hot coal gas were investigated at 700 ...
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 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 ...
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 ...
The oxidative desulphurization process of coal with different metamorphism degrees treated by an airsteam mixture has been studied. It has been shown that the pyrite present in black coal and anthracite is oxidized with the sulphur dioxide formation, and the process chemical mechanism does not depend on the quality of organic matter. ...
The FlueGas Desulfurization (FGD) process utilizes a set of technologies to remove sulfur dioxide (SO 2) from the flue gas emissions of coalfired power systems were developed as a response to the exhaust flue gases from fossil fuelburning plants, principally coalburning, that posed both an environmental and human health hazard.
Abstract. Through the purification technology of flue gas desulfurization, ultralow emissions of SO2 flue gas in industrial flue gas can be achieved. This article involves dry desulfurization, semidry desulfurization, and wet desulfurization technologies. The research progress of these technologies since they were first proposed is summarized ...
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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