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 ...
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 ...
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 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.
Hydrodesulfurization (HDS), also called hydrotreatment or hydrotreating, is a catalytic chemical process widely used to remove sulfur (S) from natural gas and from refined petroleum products, such as gasoline or petrol, jet fuel, kerosene, diesel fuel, and fuel oils. The purpose of removing the sulfur, and creating products such as ultralowsulfur diesel, is to reduce the sulfur dioxide (SO 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 ...
1000MW coalfired power plants using limestone gypsum wet desulphurization process are selected as the sample to . ... From the change of annual desulfurization cost of coalfired power plants (as .
The method of zinc oxides can be used for fine desulfurization. With coal gases desulfurized by zinc oxides, the content of sulfur in coal gases could be as low as the level of 11000 parts per billion (ppb). ... Thus, if the desulfurization process could cut down the pressure and temperature losses of blast furnace gases, it would have ...
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 ...
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 ...
In this study, coal fly ash was functionalized, using a simple onestep process (loading with Al3+ and sulfonation), to yield a solid acid catalyst (S/AlCFA) with strong acid sites. The catalyst was then used to produce furfural from xylose in a biphasic system (H2O(NaCl)/tetrahydrofuran). The furfural yield reached 82% at 180 °C60 min with catalyst/xylose ratio of : (w/w).
An alternative technology is the Alstom NID (Novel Integrated Desulfurization) process, as shown in Figure 3. A principal feature of this system is the Jtube reactor, whose outline is evident in ...
Fluegas desulfurization (FGD) is a set of technologies used to remove sulfur dioxide (SO 2) ... into exhaust ducts to eliminate SO 2 and SO 3 from process emissions. For a typical coalfired power station, fluegas desulfurization (FGD) may remove 90 per cent or more of the SO 2 in the flue gases.
The addition of MPS or ZCS can help the materials stratify strictly according to the density to enhance the sorting function. The clean coal ash and sulfur content are reduced to % and %, while the combustible recovery and desulfurization efficiency are up to % and %, respectively, under the optimal condition.
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].
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 ...
Indonesia's coal love affair still aflame despite pledges. A barge carries coal to the dock next to the Suralaya coalfired power plant in Cilegon, in Indonesia's Banten province. Sania sits in ...
Desulphurization is the removal of Sulphur Dioxide. The flue gas desulphurisation plants remove sulphur dioxides from the flue gas which is produced by boilers, furnaces, and other sources. Let us ...
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The flue gas desulfurization process of coalfired power plant boiler mainly includes dry desulfurization, semidry desulfurization and wet desulfurization. The wet desulfurization process of limestone gypsum has mature technology and high desulfurization efficiency, and it is widely used. By
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).
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 ...
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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