Friedman, oxidative desulfurization of coal, presented at 173rd acs national meeting march 1977. Coal desulfurization prior to usage is a preprocessing in order to achieve clean fuel and reduce environmental impacts such as acid rain. This book was written to provide a comprehensive survey of the current state of the art in coal preparation, with particular emphasis on coal desulfurization. This involves either the removal of sulfur from a molecule e. Chandra indian school of mines, dhanbad 826 004 india and a. On the contrary, after 12 days of processing, the coal s pyrite bioleaching rate was 72. The effect of ultrasonic before microwave irradiation on desulfurization was greater than simply microwave method. Parametric optimization of coal desulfurization through. Today, china is the largest emitter of so 2, and about 25. Tables table page 21 summary of fgd processes on u. Mishra bose institute, calcutta 700 009 india received july 23, 1987. Unit 1 is on the right or west and unit 2 is on the left or east. Our results provide insight into the potential value of research on desulfurization. Desulfurization, coal, sulfur, chemical reagents, caustic, nitric acid, ferric sulphate, ferric.
Coal is a homogeneous mixture which consists of various components with different dielectric properties, so their abilities to absorb microwaves are different, and the sulfurcontaining components. Desulfurization of coal using the electrochemical technique in neutral and alkaline media, energy sources, part a. The two coal samples are selected to represent two categories. Hydrotreating is the main technology to prepare fuel. A gasvibro fluidized bed was proposed for deash and desulfurization for fine coal. Sulfur in crude oil is mainly present in the form of organ sulfur compounds.
During coal combustion heat is released to produce steam in boilers. Pdf coal is the most important nonrenewable energy source of fossil origin. Pdf microbial desulfurization of different coals researchgate. Nonetheless, it is the preferred process for coal fired electric utility power plants burning coal due to the low cost of limestone and so 2 control efficiencies from 90% up to 98% schnelle, 2002. The deash and desulfurization characteristics of the gasvibro fluidized bed at different gas velocities and pulsation frequencies were investigated. Coal desulfurization by solvent leaching methods semantic scholar. This technology enables ratcliffe to use british coal. Bulk desulfurization natural gas contains a wide variety of sulfur compounds, and sulfur speciation in the gas can change from pipeline to pipeline, locale to locale, and season to season. Coal desulfurization and demineralization by chemical. Objectives at the end of this lesson, you will be able to do the following. Coal fired utility boilers 32 51 typical range of coal analyses 53 52 examples of coal and flue gas compositions 55 61 reheat using heat exchangers 620 62 reheat using combustion gas 621 63 direct steam. Coal desulfurization and demineralization by chemicalphysical treatments a dissertation submitted to the graduate faculty in partial fulfillment of the requirements for the degree of doctor of philosophy major. Ash segregation standard deviation was proposed to evaluate separation efficiency. Desulfurization of lakhra pakistan coal was conducted with different solvents.
I desulfurization of coal yasuo ohtsuka encyclopedia of life support systems eolss temperature desulfurization process is well proven, the reduction of sorbent consumption is required to minimize the costs for sorbent and residue management. Jiang at the coal tech 2000 international conference november 14, 2000 jakarta, indonesia br1709 paul s. Sulfur in the form of pyrite fes2 is transformed into the gas phase as sox after combustion process. Chuang, kangchun, desulfurization of coal by oxidation in alkaline solution 1979. The authors would like to thank the head of chemical engineering department, college of engineering, and american university of sharjah for providing all the facilities to perform this work. Pdf on jan 1, 1987, surendra kawatra and others published coal desulfurization. Desulfurization of oxidized indian coals with solvent. Jiang at the coaltech 2000 international conference november 14, 2000 jakarta, indonesia br1709 paul s. Biological cleaning, chemical cleaning, coal, desulfurization, flue gas desulfurization, inbed desulfurization, limestone, organic sulfur, physical.
Coalfired utility boilers 25 31 operational fgd systems on u. This enhances the magnetic susceptibility of the inorganic sulfur containing material. Coal desulfurization and demineralization by chemicalphysical. They hold great potential for the economical reduction of sulfur emissions from power utilities that use highsulfur coal. Microbial desulfurization of solubilized coal article pdf available in biotechnology letters 245. Sulfatrap sorbents remove all forms of organic and inorganic sulfur from hydrocarbon streams. Oct 27, 20 after 16 days of processing, the total sulfur removal rate of coal was 50. With the advantages of its fast speed, effective and moderate controllable conditions, desulfurization of coal by microwave has become research focus in the field of clean coal technology. Desulfurization of pakistani coal has been carried out through alkaline leaching. Such a book has not been available since robert meyers wrote coal desulfurization in 1977, and considerable advances have been made in the more than 20 years since then. Sulfur is a hindrance to effective utilization of coallignite in view of the. Desulphurisation is a chemical process for the removal of sulfur from a material.
It consists in converting the sulfur dissolved in the metal to sulfides that are either insoluble or poorly soluble in the liquid metal bath for example, mns, mgs, cas, and na 2 s. The north eastern region ner of india has a substantial deposit of high sulfur 2. Control device absorption and reaction using an alkaline reagent to. Dry sulfurization processes offer the significant advantages of low capital and low operating costs when compared to wet desulfurization. Flue gas desulfurization scrubbers have been applied to combustion units firing coal and oil that range in size from 5 mw to 1500 mw. The present investigation reports desulfurization of oxidized assam coals by.
Sem micrographs showed that the major pyrite forms in coal were massive and veinlets. The chemical structure of coal macerals is usually characterized by the. It is also the most common fuel in thermal power plants. Coal was leached with different solvents like hot water, h 2 o 2 h 2 so 4 and hno 3. Pdf2015 000939 is thankfully acknowledged by aniruddha kumar. India, in the form of national postdoctoral fellowship research grant file no. Ppt desulfurization of coal powerpoint presentation free. Desulfurization of lu,an coal by ultrasonic and microwave.
Aug 15, 2014 by using this method, the desulfurization rate of shandong guohong coal can reach 62. One of the cheaper method of removing sulfur from coal is biological process. Coalfired utility boilers 32 51 typical range of coal analyses 53 52 examples of coal and flue gas compositions 55 61 reheat using heat exchangers 620 62 reheat using combustion gas 621 63 direct steam. Hot coal gas desulfurization with manganesebased sorbents. A gasvibro fluidized bed is proposed for the dry beneficiation of fine coal by introducing active pulsing gas into a separating fluidized bed.
Experimental conditions and coal analyses are shown in table 1. Advancement of hydrodesulfurization catalyst and discussion. Semidry systems semidry systems, or spray dryers, inject an aqueous sorbent slurry similar to a wet system, however. In charge of major work for the majoaf department for the graduate college. Each has some technical and economical limitations. The major coal desulphurization technologies prior to combustion are physical coal cleaning, chemical and biological methods. The key aspect of the process is the dissolution of the gas from the fumes into a liquid made of water with suitable additives. Pdf desulfurization of coal using the electrochemical. Thus, the fluidized bed combustor fbc technology using limestone as a desulfurization agent is. Sulfur dioxide is responsible for acid rain formation. Flue gas desulfurization flue gas desulfurization is commonly known as fgd and is the technology used for removing sulfur dioxide so2 from the exhaust flue gases in power plants that burn coal or oil to produce steam for the steam turbines that drive their electricity generators. During present experimental investigation, the effect of operating parameters like alkali concentration, time, temperature and particle size has also been analyzed, graphically represented and critically discussed. Coalfired power plant wet flue gas desulfurization bromide. Physical coal cleaning can only remove limited amount of inorganic sulphur due to insufficient liberation.
Thus, the fluidized bed combustor fbc technology using limestone as a desulfurization agent is very appropriate to the use of this kind of coal. Comparison analysis of coal biodesulfurization and coals pyrite. Problems encountered with this document have been identified here with a check mark v. After microwave and ultrasonic coenhanced oxidative desulfurization of coal, the content of sulfur in coal was decreased by the xps.
Desulphurization of coal to protect the environment springerlink. Some additives are very successful in hg oxidation 14. Epa452f03034 air pollution control technology fact sheet epacica fact sheet flue gas desulfurization1 name of technology. Novel desulfurization process of heavy fuel oil using surfactant. Assam, one of the coal producing states of the region, has coal deposits with 75.
Results of these analysis are shown that gediz coals include 3. Flue gas desulphurisation plant purpose the flue gas desulphurisation fgd plant removes sulphur dioxide from the flue gas before it is released into the atmosphere and hence reduces our impact on the environment. Dry scrubbers and spray scrubbers have generally been applied to units smaller than 300 mw. Coal, oil shale, natural bitumen, heavy oil and peat vol. Flue gas desulfurization technologies for coalfired power.
Ppt desulfurization of coal powerpoint presentation. Coal fired utility boilers 25 31 operational fgd systems on u. Flue gas desulfurization technologies for coalfired power plants. Flue gas desulfurization technologies for coal fired power plants presented by michael x. Flue gas desulfurization acid gas removal systems goal to familiarize you with the operation of flue gas desulfurization fgd systems that use a scrubbing liquid to absorb so2 present in the exhaust gas stream. Desulfurization of coal by bacterial means sciencedirect. Microbial desulfurization of different coals article pdf available in applied biochemistry and biotechnology 118. Desulfurization of tabas coals using chemical reagents. Sulfurous gases primarily sulfur dioxide produced by the combustion of foss. Desulphurization of coal to protect the environment. Resources, conservation and recycling, 1 1988 293308 293 elsevier science publishers b.
Flue gas desulfurization fgd wet, spray dry, and dry scrubbers type of technology. Semiannual report showing 14 of 15 pages in this report. Pergamon press plc printed in the netherlands desulfurization of coal by bacterial means d. Profiles in flue gas desulfurization download ebook pdf. In general, all the ions present in the slurries of wfgd plant affect the chemistry and stability of hg and hg species 16. Illinois state geological survey, open file series, 1. Total sulfur st, desulfurization, coal samples, ralstonia sp. The sulphur form was investigated systematically using xray photoelectron spectroscopy xps. Flue gas desulphurisation download ebook pdf, epub, tuebl, mobi. Coal tar is the main byproduct of coal gasification and coal coking process, its output was about 15 million tons with the annual growth rate about.
Desulphurization technologies pre sent a higher potential only if applied in the framework of an integrated waste management scheme. Coalfired power plant wet flue gas desulfurization. Progress of the technique of coal microwave desulfurization. Why we make the process of removal of sulfur from crude oil. It must be mentioned that a present study showed that the pyrite formation could also influence the coals desulfurization. Desulfurization article about desulfurization by the free. Desulfurisation of coal and oil linkedin slideshare. High efficiency preparation methods find, read and cite. Wet flue gas desulfurization fgd wastewater discharges from coal fired power plants may increase bromide concentrations at downstream drinking water intakes, leading to increased formation of toxic disinfection byproducts dbps. Separation efficiency can be modified by the active pulsing gas significantly. Deash and desulfurization of fine coal using a gasvibro. Flue gas desulfurization flue gas desulfurization is commonly known as fgd and is the technology used for removing sulfur dioxide so 2 from the exhaust combustion flue gases of power plants that burn coal oroil to produce steam for the turbines that drive their electricity generators. Removing pyritic sulfur from gedizturkey coal with.
Wet flue gas desulfurization fgd wastewater discharges from coalfired power plants may increase bromide concentrations at downstream drinking water intakes, leading to increased formation of toxic disinfection byproducts dbps. The limestone is mixed with the coal prior to injection into the reactor, directly in the combustion chamber, by a screw feeder system and auxiliary air. Desulfurization of coal by oxidation in alkaline solution. Coal has the most abundant reserves and is always the most important energy on earth, which accounts for more than 24% in energy production in the world. The address for the corresponding author was captured as affiliation for all authors. Nevertheless, direct combustion coal leads to the emission of sulfur oxides, which can cause adverse effects on environment. Despite this, bromide was not regulated in fgd wastewater in the 2015 effluent limitations guidelines and standards for the steam electric power generating point. Coal from candiota mine, located in the southern region of brazil, is a subbituminous and high ash coal with 50% of inorganic material, but highly reactive, and low sulfur content.
About 2 g of coal acid gas removal systems goal to familiarize you with the operation of flue gas desulfurization fgd systems that use a scrubbing liquid to absorb so2 present in the exhaust gas stream. Comparison analysis of coal biodesulfurization and coals. Other treatment processes include several chemical methods and biological. Recovery, utilization, and environmental effects, doi. Flue gas desulfurization technologies for coalfired power plants presented by michael x. Coal coal can contain up to 10% sulfur by weight, although values of 1 4% are more typical depending on the region where the coal was extracted. Coal activated carbon for desulfurization treating the effluent air stream with activated carbon has been found to be one of the best ways to remove hydrogen sulfide. Wheelock, advanced development of fine coal desulfurization and recovery technology, quarterly technical progress report february 1977.