In order to achieve better desulfurization effect, the researchers employ methods of adding chemical additives such as acid, alkali, oxidant, reductant, or changing the reaction atmosphere, or combining with other methods such as magnetic separation, ultrasonic and microorganism.
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The desulfurization process of circulating fluidized bed desulfurization technology involves the injection of flue gas from the bottom of the fluidized bed through a Venturi tube. ... Microwave heating motivated performance promotion and kinetic study of iron oxide sorbent for coal gas desulfurization. Fuel, 267 (2020), Article 117215, ...
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XANES was used to analyze the change of sulfur forms in the desulfurization process of high organic sulfur coal under microwave heating and conventional heating conditions. The effects of microwave fields on the molecular properties, bond strength and reaction kinetic of organic sulfurcontaining groups were studied by quantum chemical calculation.
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article{osti_, title = {Coal desulfurization by a microwave process}, author = {Zavitsanos, P D and Golden, J A and Bleiler, K W and Jacobs, I S}, abstractNote = {A laboratory size flow reactor was developed and tested on coal samples up to 100 g/batch. A modified version of the applicator will increase sample size to 1000 g; when run continuously it can handle 500 g to 1000 g/minute.
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The complicated mass transfer during coke making process leads to the uneven spatial distribution of sulfur forms in coke, which is of great importance for the sulfur transformation and desulfurization efficiency. ... Char yield and desulfurization rate of YJH coal during pyrolysis. Fig. 5 presents the release rate of H 2 S, SO 2, ...
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Most of the coal, oil and natural gas produced in the world are used as fuels and a small part is used as a chemical feedstock. Undesulfurized coal and oil in the combustion process will produce a large number of sulfur oxides (SOx), serious harm to human health, and environmental damage. The unpurified natural gas containing hydrogen sulfide (H2S) is difficult for industrial application. This ...
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Coal desulfurization Full Record Related Research Abstract The Meyers process of removing pyritic sulfur from coal chemically before it is burned is presented.
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The present work describes the desulfurization of coal using mildly reductive method. Both a Yanzhou and a Yanshan coal (referred to as YZ and YS coal, respectively), were treated in an aqueous media employing sodium borohydride (NaBH 4) as reducing agent, which is a well known hydrogen variables investigated include concentration of reductant, time, pH of initial media ...
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environment, the desulfurization and denitration of flue gas in the combustion process of coal has become an important step. T his work summarizes the desulfur ization and denitration
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The flue gas desulfurization solids in the dry process (DFGDS) are the newly formed CaSO 4 and the unreacted excess of CaO. They are carried along with the coal FA out of the boiler, forming the end product (FA + DFGDS), which is highly alkaline due to the excess of CaO with respect to the initial SO 2 (Ca:S = ). Due to a low ...
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The desulfurization process took place at a pH of 35, the coalparticle size was 7545 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 from 6219 cal/g to 6406 and 6315 cal/g, which indicated ...
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Coal desulfurization is imperative to create clean coal and reducing harmful emissions during the combustion process. However, organic sulfur in coal is more difficult to remove than inorganic sulfur. Therefore, in this paper, a method of coal sample desulfurization using citric acid with microwave assisted was proposed, and experimental ...
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The flue gas desulfurization process in coalfired power plants is energy and resourceintensive but the ecoefficiency of this process has scarcely been considered. Given the fluctuating unit load and complex desulfurization mechanism, optimizing the desulfurization system based on the traditional mechanistic model poses a great challenge. In this regard, the present study optimized the eco ...
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In this work, the desulfurization process of highsulfur anthracite coal is discussed, and the desulfurization method of "reduced iron powder + heat treatment + magnetic separation" (named "RIHM") is designed. ... In this study, a highsulfur coal desulfurization experiment was carried out for highsulfur raw coal to reveal the internal ...
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Pyrolysis desulfurization is suitable for coal. By changing the coking conditions to promote the effusion of sulfide in the form of gas. ... The high temperature, pressure and strong acid or alkali in traditional desulfurization process increase the hazards and bring secondary pollution. Essentially, desulfurization is a combination of ...
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This study investigated the characteristics of mercury emitted from a largescale coalfired power plant in Taiwan via intensive sampling campaigns. The air pollution control devices equipped in this coalfired power plant include selective catalytic reduction, fabric filter and seawater flue gas desulfurization. During three sampling campaigns, mercury concentrations emitted from this large ...
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At present, the desulfurization technology is divided into pretreatment, inuse treatment, and posttreatment. Inuse treatment, in the case of coal, is generally defined as the spraying of desulfurizer into the coalburning boiler, which is capable of converting SO 2 and SO 3 emissions from coal combustion into sulfites or sulfates (Lu et al. 1998; Sun et al. 2018).
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Coal desulfurization by microwave with additives has been investigated in many aspects, including desulfurization effects [38], coal property changes [39], sulfur species and dielectric characteristics [27,40]. ... XANES was used to analyze the change of sulfur forms in the desulfurization process of high organic sulfur coal under microwave ...
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The resultant products of this process,, (NH 4) 2 SO 4, can be recycled as fertilizers while reducing the discharge of solid or liquid waste. During the desulfurization process, many elements produced from the burned coal, such as metal ions, ash, fluoride, and chloride, are absorbed and accumulated in the desulfurization slurry.
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This paper briefly introduces various methods of coal desulfurization (physical desulphurization, chemical desulfurization, biological desulfurization, etc.) and analyzes some problems existing in each method. The principle and research process of friction electrostatic separation technology and high gradient magnetic separation technology in precombustion desulfurization technology are ...
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Abstract. 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 ...
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The main factor for the results above was that the desulfurization mechanisms were different. Therefore, the research of different desulfurization mechanisms is the main direction of future work. The consequence of this paper would provide data support for the selection of the desulfurization method for high sulfur coal.
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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.
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Wet Desulfurization Technology (WFGD) is the main process for flue gas desulfurization in coalfired power plants in China, mainly including limestonegypsum wet method and seawater desulfurization. At the end of 2014, more than % of the desulfurization equipment was WFGD.
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The increasing use of highsulfur coal contradicts with the stringent environmental pressure in metallurgical industry. Microwave has been confirmed to have efficient effect for coal desulfurization. However, the removal behavior of thiophenic sulfur, as the most difficult sulfur to remove from coal, is still unclear in microwave field. In this work, the feasibility of removing thiophenic ...
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environment, the desulfurization and denitration of flue gas in the combustion process of coal has become an important step. This work summarizes the desulfurization and denitration ... In the wet desulfurization process, the scaling and blockage of equipment are easy to occur in the process site. In view of the above problems, a calciumsodium ...
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