The 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, ...
That shows desulfurization reaction in the furnace is complete. At the same time, the composition of fly ash and circulating ash are similar to each other. Before the renovation, desulfurizer is only active calcium in the raw coal during desulfurization process.
Coal desulfurization by microwave with additives has been investigated in many aspects, including desulfurization effects [38], coal property changes [39], sulfur species and dielectric characteristics [27,40]. ... XANES was used to analyze the change of sulfur forms in the desulfurization process of high organic sulfur coal under microwave ...
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 ...
The study aims to develop a thorough understanding of the desulfurization process and establish a theoretical framework for advancing clean coal technology and efficient coal utilization. Stringent control was maintained over parameters such as particle size, pretreatment time, bacterial species, and bacterial concentration.
This work was conducted through field tests on a coalfired circulating fluidized bed boiler with a condensation scrubber (CS) for flue gas waste heat recovery installed behind the wet flue gas desulfurization (WFGD) scrubber. Levels of multiple pollutants were investigated along the various flue gas devices of the boiler, with the CS being the ...
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 ...
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.
The Energy Information Administration estimates (as of October 2022) that in 2021, CO 2 emissions from burning coal for energy accounted for about 20% of total energyrelated CO 2 emissions and for nearly 60% of total CO 2 emissions from the electric power sector. In the past, fly ash was released into the air through the smokestack ...
In 2010, Li and coworkers demonstrated an extremely rapid, convenient and mild coal desulfurization new process using sodium borohydride and 3141% reduction of total sulphur was achieved (Li et ...
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 ...
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 ...
Coal desulfurization Full Record Related Research Abstract The Meyers process of removing pyritic sulfur from coal chemically before it is burned is presented.
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 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 ...
Since the "Eleventh FiveYear Plan" period, the construction of flue gas desulfurization and denitrification facilities for coalfired power plants have been accelerated to control the emissions of sulfur dioxide (SO 2) and nitrogen oxides (NO X) and thus to address the issue of acid rain in to the goal of the "Thirteenth FiveYear Plan for Energy Saving and Emission ...
When 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.
Fluegas 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.
At 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).
The 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.
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.
The increasing use of highsulfur coal contradicts with the stringent environmental pressure in metallurgical industry. Microwave has been confirmed to have efficient effect for coal desulfurization. However, the removal behavior of thiophenic sulfur, as the most difficult sulfur to remove from coal, is still unclear in microwave field. In this work, the feasibility of removing thiophenic ...
Abstract. 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 ...
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.
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.
Desulfurization 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
A large amount of SOx will be produced in the combustion process of coal without desulfurization, which is the main factor causing air pollution, environmental damage and increase.
The present work describes the desulfurization of coal using mildly reductive method. Both a Yanzhou and a Yanshan coal (referred to as YZ and YS coal, respectively), were treated in an aqueous media employing sodium borohydride (NaBH 4) as reducing agent, which is a well known hydrogen variables investigated include concentration of reductant, time, pH of initial media ...
Coal 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 ...
3. 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 ...
Coal 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 ...
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.
![Desulfurization of coal using four ionic liquids with [HSO4]−](/wlzyj9a/217.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.
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,
The 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 ...
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