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 ...
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 ...
Oxidation is the most widely used process for coal desulfurization [17, 2932] due to its ability to . remove the p yritic sulfur [33] and the macromolecular network [34].
Biological desulfurization processes as well as microbial coal desulfurization are called as one of precombustion coal desulfurization processes. The biodesulfurization can be described as microbiological sulfur removal from coal under ambient temperature and pressure without reducing calorific value (Kilbane et al. 2002).
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.
The flue gas desulfurization (FGD) plant removes sulfur dioxides (SO 2) from flue gas produced by boilers, furnaces, and other sources. Mitsubishi Power effectively contributes to the prevention of air pollution through its wet limestonegypsum FGD process and seawater FGD process, and both processes can treat a large range of SO 2 ...
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 ...
During the desulfurization process of coalfired power plants, there are many related parameters that affect the desulfurization efficiency. So it is very difficult to measure the desulfurization efficiency directly. In this paper, in order to reflect the relationship between monitoring process parameters and desulfurization efficiency better, a novel prediction model of desulfurization ...
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.
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 ...
Flue gas desulfurization gypsum (FGDG) is an industrial byproduct generated during the flue gas desulfurization process in coalfired power plants. Flue gas desulfurization systems have been used to limit the release of sulfur dioxide from coalfired power plants since the late 1960s, but in the past decade the production of FGDG has ...
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.
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 approach is developed for desulphurization of fuels or organics without use of catalyst. In this process, organic and aqueous phases are mixed in a predefined manner under ambient ...
Coal, as a fossil fuel, contains carbon, hydrogen, sulphur, oxygen and element of acidic. Therefore, the combustion of coal contributes to the emission of SO 2, CO 2, and NOx into the atmosphere [14]. CO 2, NOx and SO 2, which is combustible, is produced during the coal combustion process.. As discussed earlier, the release of CO 2
Flue gas desulfurization systems (FGD) or scrubbers are devices capable of sulfur removal efficiencies between 50% to 98%. Typically the highest removal is achieved by wet scrubbers and the lowest by dry scrubbers. They are used in coalandoil fired combustion units including utility and industrial boilers, municipal and medical waste ...
As a typical industrial byproduct during the flue gas desulfurization process of coalfired, flue gas desulfurization ash (FGDA) with alkali mineral can facilitate the water damage resistance of asphalt mixtures. However, low density and high hydrophilic coefficient of FGDA limit its improvement effect.
A novel desulphurization process of coal water slurry via sodium metaborate electroreduction in the alkaline system article{Shen2012AND, title={A novel desulphurization process of coal water slurry via sodium metaborate electroreduction in the alkaline system}, author={Yafei Shen and Tonghua Sun and Jinping Jia}, journal={Fuel}, year={2012 ...
Wet flue gas desulfurization technology has become the most widely used desulphurization technology. The researchers have applied analytic hierarchy process to analyze three aspects of desulfurization system in power plant including technology, economy and sustainable development [1]. Abboud et al. [2] gave the detailed economic evaluation on
sulfur than coal used in Japan and is hereafter referred to as "eastern bituminous highS coal"), and its excellent performance was confirmed by means of verification testing on equipment in the USA(4). In addition, to handle a wide variety of coals from around Fig. 2—Process Flow of New Fluegas Treatment System.
© DZCrusher - كل الحقوق محفوظة
