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 ...
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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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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.
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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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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 ...
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A process flow diagram for the HDS plant is shown in Fig. 1. Desulfurization reactions take place in fixed bed catalytic reactors (∆ R) where a minimum ratio H 2 /hydrocarbon must be ensured for catalyst maintenance reasons. Reactors are fed with a blend of fuels of different qualities. The hydrocarbon (HC) feed is mixed with the recycled H 2 stream (R) and with makeup H 2 from the network.
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The density of pyrite is higher than coal. Therefore, when coal is crushed and washed in water, the particles that are rich in the pyrite sink and the particles that are rich in carbon (organic) float. ... Cutler et al. [44] discloses the use of honeycomb monolithic adsorbents for fuel desulphurization process. The authors further recommend the ...
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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 ...
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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.
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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 ...
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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 ...
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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 ...
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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. ...
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With the increasingly prominent global energy and environmental problems, more and more enterprises have been required to desulfurize the exhausted gases. Different enterprises have different demands for the desulfurization process, thus the choice of desulfurization process methods has become a focus of attention. Since the evaluation of the desulfurization process involves many factors, this ...
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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 ...
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The flue gas desulfurization wastewater is highly saline and has too many refractory pollutants to be recycled during the desulfurization process of the coalfired heating plant. Given that waste heat is abundant in coalfired heating plants, a thermal ...
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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 ...
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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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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 ...
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Coal desulfurization has been regarded as an effective pretreatment for clean fuel and less environmental pollution. The microwave irradiation was used to desulfurize the Nantong coal leached with H 2 O 2 and NaOH. The results showed the desulfurization rate of the coal is very low by directly microwave irradiation, while the coal samples leached with H 2 O 2 and NaOH by microwave irradiation ...
WhatsApp: +86 18203695377![Process for coal desulfurization. [use of microwave energy]](/pf1n9vq/208.jpg)
A process for coal desulfurization generates extremely low amounts of heat from microwave energy to induce thermochemical, insitu, reactions to liberate sulfur in the form of stable gaseous species, such as H/sub 2/S, COS and SO/sub 2/. Inventors:
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A new multiphase noncatalytic process is developed for deep desulphurization of fuels or organics using hydrodynamic cavitation with vortex diode as a cavitating device. The process can ...
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N2 The paper proposed a twostep desulphurization process using ironbased high temperature sorbents for removal of hydrogen sulfide from hot coal gases after coal gasification. The authors use the mixture of iron oxide with other metal oxides ( Ce) supported by ash from a coalgangue fired power plant to prepare high temperature ...
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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. According to the pyrolysis conditions, it can be divided into pyrolysis desulfurization under atmosphere and copyrolysis desulfurization with additives [40], [41], [42]. Up to now, pyrolysis desulfurization ...
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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 ...
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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. The effects of the heating temperature, heating time and coaliron mass ratio on desulfurization were discussed, the process of ...
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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...
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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 ...
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