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 ...
WhatsApp: +86 18838072829environment, 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 ...
WhatsApp: +86 18838072829The 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 ...
WhatsApp: +86 18838072829A 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 ...
WhatsApp: +86 18838072829environment, 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
WhatsApp: +86 18838072829Most 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 ...
WhatsApp: +86 18838072829The FGD products are included in coal combustion products. The components of CCP's are as follows: fly ash, 57 percent; FGD products, 24 percent; bottom ash, 16 percent; and boiler slag, 3 percent. What is flue gas desulfurization? Flue gas desulfurization is a chemical process to remove sulfur oxides from the flue gas at coalburning powerplants.
WhatsApp: +86 18838072829The 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.
WhatsApp: +86 18838072829To solve the safety problem of spontaneous combustion of highsulfur coal, applied microbiology, physical chemistry, reaction kinetics theory, combined with the SEM, FTIR and TGDTGDSC experiments and analysis of testing methods, the microbial desulfurization experiments were carried out, and the change law of the desulfurization reaction of coal before and after the element composition, main ...
WhatsApp: +86 18838072829When the consumed sulphur in coal is in the form of sulphur dioxide at the end of combustion, it reacts with water at high altitudes. Moreover, it goes down to the earth in the form of sulphuric acid, as well as damaging plants. The corrosive harmful impact on industrial plants is the removal of the sulphur in the coal when it is environmental.
WhatsApp: +86 18838072829Abstract. Most coal requires some preparation before use. Preparation may range from simply crushing to provide a size consist suitable for certain types of boilers to extensive size reduction and cleaning to remove sulfur and ashforming mineral matter. At present, coal cleaning is accomplished through physical separation of particles low in ...
WhatsApp: +86 18838072829The 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, ...
WhatsApp: +86 18838072829Coal 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 ...
WhatsApp: +86 18838072829A 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:
WhatsApp: +86 18838072829Coal desulfurization has come a long way in the past 15 years, and chemical desulfurization has been at the forefront of this progression. Unfortunately, unless some new technique is developed, the chemical desulfurization processes appears to be at a stalemate. ... The Meyers process of removing pyritic sulfur from coal chemically before it ...
WhatsApp: +86 18838072829The 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 ...
WhatsApp: +86 18838072829The 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.
WhatsApp: +86 18838072829The 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, ...
WhatsApp: +86 18838072829The process of sulfur removal by microbes is carried out by enzymes and is considerably influenced by different factors, including pH, temperature, nutrient composition, shaking or standing condition, coal types, and most importantly type of microorganisms used.
WhatsApp: +86 18838072829Fluegas desulfurization (FGD) material is a product of a process typically used for reducing SO 2 emissions from the exhaust gas system of a coalfired boiler. The physical nature of these materials varies from a wet sludge to a dry, powdered material depending on the process.
WhatsApp: +86 18838072829In addition, the photocatalytic desulfurization process has little effect on the heat value of coal. On a basis of TGDSCDDSC analysis, it is found that the calorific value of the coal after photocatalytic desulfurization was slightly changed and the low temperature oxidation tendency was decreased which is helpful for desulfurized coal storage.
WhatsApp: +86 18838072829Most 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 ...
WhatsApp: +86 18838072829Flue 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 ...
WhatsApp: +86 18838072829In 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.
WhatsApp: +86 18838072829The 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.
WhatsApp: +86 18838072829Before and after the desulfurization process; total sulfur, pyritic sulfur, carbon content and calorific value were measured. The highest removal efficiencies of total sulfur and pyritic sulfur for Burdur coal obtained as 41% and 67%, for Tunçbilek coal obtained as 41% and 35%, and for Ermenek coal obtained as 47% and 41%, respectively.
WhatsApp: +86 18838072829The 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 ...
WhatsApp: +86 18838072829Flue 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.
WhatsApp: +86 18838072829Desulfurization of Coal by Pyrolysis and Hydropyrolysis with Addition of KOH/NaOH Quanrun Liu, Haoquan Hu, Shengwei Zhu, Qiang Zhou, Wenying Li, Xianyong Wei, and Kechang Xie View Author Information Cite this: Energy Fuels 2005, 19, 4, Publication Date: April 23, 2005 https:////ef
WhatsApp: +86 188380728293. TYPES OF COAL Anthracite: This is the highest ranked, hardest, oldest, and least common type of possesses a high energy content, high percentage of carbon (>85%), energy content of 25 million BTU /ton (11,300 BTU/lb). Bituminous: This is the second rank of coal, softer and younger than anthracite, and containing a lower percentage of carbon (45 85%) and therefore more moisture and ...
WhatsApp: +86 18838072829At 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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