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 ...
Hot coal gas desulfurization process operating at elevated temperature (600850 °C) is an efficient and environmentally friendly process for raw syngas purification (Tamhankar et al. 1986). The sketch of hot coal gas desulfurization process is depicted in Fig. 1. Coal was gasified at temperatures of > 1000 °C to produce raw syngas (~ 850 ...
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 to an interest in the three main methods of removing coal sulfur: coal cleaning, inbed desulfurization, and flue gas desulfurization. Coal cleaning includes physical, chemical,
Flue gas desulfurization (FGD) removes the SO2 from the flue gas of coalfired plants. This postcombustion method is the most widely used technology for controlling SO2 emissions.
In addition, the sulfur content of the raw coal reduces from % to %, total desulfurization rate of %, whose organic sulfur desulfurization is % after coal in shake flask experiments. And the desulfurization rate approaches the maximum value on the tenth day (from Figure 2B). It was demonstrated that strain SX12 could ...
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.
Desulfurization systems in coalfired power stations often suffer the problem of high operating costs caused by a ruleofthumb control strategy, which implies great potential for optimization of the operation. ... In this paper, an operation strategy optimization method for the desulfurization process is proposed based on a data mining ...
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.
For future approaches, as well as desulfurization process, increasing the purity of coal may also promote the value of coal and prevent environment pollution. In the study of Etemadifar et al., growing and resting cells of heterotrophic Rhodococcus erythropolis strains PD1, R1, and FMF, and R. qingshengii were utilized in sulfur removal and ...
Flue gas desulfurization (FGD) systems using lime or limestone as the chemical reagent are widely used throughout the world for SO 2 emissions control at coalfired power plants. Ammoniabased ...
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 ...
Physical desulfurization methods can only remove inorganic sulfur and are economical and practical in nature. 14,15 Highgradient magnetic separation technology is an effective method for physical desulfurization, which can be used to deal with fine particles of paramagnetic minerals and is applied to the desulfurization of fine coal (mainly ...
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 ...
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, ...
![Desulfurization of coal using four ionic liquids with [HSO4]−](/cud8b96/84.jpg)
The objective of this study is to develop the extractiveoxidative desulfurization process for cleaning fuel production from coal with ionic liquids, which can be carried out under mild condition. ... Exploration on the action mechanism of microwave with peroxyacetic acid in the process of coal desulfurization. Fuel, Volume 214, 2018, pp. 554560.
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 ...
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 ...
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 ...
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 ...
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 ...
Flotation desulfurization is the process of separating sulfur from coal samples into tailing products based on the differences in the physical and chemical properties of the mineral surfaces without changing the original sulfur content of the entire coal. ... and {111} facets in alk. soln., which is beneficial to the coal desulfurization. These ...
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