Coal water slurry cws is a substitute fuel for oil used in boilers and gasifiers. Doegrand forks project office 422 publications only a combustion test facility to evaluate coal water fuels for use in utility boilers originally designed for oil. When in the pipeline, the slurry moved along at a leisurely four miles an hour. Combustion of black coal in the form of coalwater slurry. Coal water slurry fuel is a combustible mixture of fine coal particles suspended in water. Combustion of black coal in the form of coalwater slurry in. Nov 14, 2014 coal would be crushed, then mixed with water to create a slurry and sent via pipeline to its destination, where the mixture was dried, then burned. Coalwater slurry fuel cwsf normally consists of 5070 percent pulverized or micronized coal. The main components of coal water slurry are coal, water, and additives inputted in the coal milling process to create a liquid fuel with similar flow properties as oil. This paper presented a method of a new kind of triplex mixture system of oil water coal slurry preparation. Preparing the liquid and solid products of htd for coal water slurry cws could recover the energy. The main objectives of the present investigation are. The very first application for red valve pinch valves was on the worlds first coal slurry pipeline. This paper presented a method of a new kind of triplex mixture system of oilwatercoal slurry preparation.
Coal slurry is made from 6570% of different grains of coal powder and 3035% of water with approximately 1% of additive prepared and mixed in proprietary process. Comparisons among the nozzles were carried out in terms of spray droplet mean diameter and. So it is getting topical to use coal as a coal water slurry fuel cwsf. Pulverized coal can be mixed with water and made into a slurry, which can be handled like a liquid fuel and burned in a boiler designed to burn oil. Lignite coal water slurry combustion characteristics in a laboratoryscale furnace d. May 16, 2020 potential contamination of ground water is an issue with underground disposal methods. The slurries consisted of 6 x 10, 100 x 200, and 200 x 0 mesh coal in water. Mixture of coal up to 70% in weight, water up to 29% and suitable. Coal sludge slurry css, which is made by blending sewage sludge with coal, water, and additives, is being identified as a new and effective sludge utilization technology. Coal sludge impoundments, or ponds, can store billions of gallons of liquid coal waste known as sludge or slurry.
Coal particles burn in suspension and release heat, which is transferred to water tubes in the. Pdf this research presents the case for design and development of coal water slurry cws plant for industrial use in pakistan. The slurry is then pumped into a tank where it is mixed with highpressure dense co 2. In short, these detrimental aspects of rail transport proba bly cannot be completely eliminated but should be minimized in every available way. Life cycle cost analysis of coal water slurry process in indonesia proceedings of academics world 51st international conference, bangkok, thailand, 16th17th november 2016, isbn.
This subject has involved our group in industrial mathematics at the university of florence for several years. The first step in the process is the preparation of a coal water slurry under ambient conditions. Manfred electric power research institute, 3412 hillview avenue, palo alto, ca 94303, u. Doegrand forks project office 422 publications only a combustion test facility to evaluate coalwater fuels for use in utility boilers originally designed for oil. Micronized coal water slurry advantages of cwf as a liquid, cwf has inherent advantages over solid coal. It may be stored in tanks, transported by a variety of methods, including pipelines, and pumped, atomized, and burned much like a heavy fuel oil. Combustion of coalwater slurry droplets sciencedirect. Nov 18, 2009 we use your linkedin profile and activity data to personalize ads and to show you more relevant ads.
Today, more than 50 years later, coal handling remains a popular application for many red valve pinch valve products. Product e and 3 parts of product f were blended together and the resulting blend is referred to. It retains the original physical character of solid coal and more importantly, it poses the liquidity flow ability, mobility and stability of heavy fuel oil characteristic. The environmental and pollution aspects of coal slurry. Aqueous coalwater slurry compositions download pdf. Coalwater slurry or coalwater mixture cws or cwm is a. This is different than another slurry, coal water mixture cwm, a mixture of coal and water. This page was last edited on 15 january 2020, at 14. While com is convenient for burning and while it was tested before cwm. But it also contains carcinogenic chemicals used to process coal and toxic heavy metals that are present in coal, including arsenic, mercury, chromium. Michael mclaren states the addition of a water treatment technology is something that xfuels has been exploring for some time to improve our bottom line. Potential of breakthroughs of impounded coal refuse slurry.
The secondary purpose was to determine if the energy requirements to pipeline the coalwater slurries could be predicted from the rheology data. Since a furnace bottom hopper was not part of the retrofit, manual ash removal was. Coal water slurry fuel is a combustionable mixture of fine coal particles suspended in water. It can be used to power boilers, gas turbines, diesel engines and heating and power stations. Crushed coal can be transferred by pipeline when water is added, creating a coal slurry. The slurrying properties of coal water slurries containing raw. The attractiveness of this type of fuel is primarily due to its functional proper. Potential of coalwater slurries as an alternative fuel. According to this method, the coal co 2 slurry is prepared via a coal water slurry. In order to use lignosulfonates a byproduct of pulp and paper processes as an effective dispersant of coal water slurry five purified sodium lignosulfonate sl samples with different molecular. Coalwater slurry or coalwater mixture cws or cwm is a complex solidliquid dispersion. Coal water slurry power plant, coal water slurry power plant. A fourth slurry consisted of a mixture of the 6 x 10 and 200 x 0 mesh coal.
Triplex synfuel containing gasoline, water and coal was prepared using nonionic surfactant. Hydrothermal treatment of the blend of lignite and rapid hydrogasification char for preparing slurry fuels. Coal slurry is a mixture of solids mined coal and liquids water or organic produced by a coal preparation plant. For preparing coal water fuel cwf, kuznetsk coals of g and d ranks, as well as tailings of coking coals, were used. Desulfurization from bauxite water slurry bws electrolysis. Coalwater slurry cwsdispersant is a key to prepare fine coalwater slurry. Abstracturing the years of oil shortage and rapidly increasing oil prices, the need to decrease.
The problem was performed in cooperation with the engineering team of snamprogetti, an italian company wellknown among those designing and selling technology for fuel energy production and trans. Symbols as in figure 4 fuel, 1986, vol 65, february 173 combustion of coal water slurry droplets. Cwsf is a composite dispersion system and it consists of coal and a liquid phase water 1. Factors affecting the preparation of highly concentrated coalwater. Coal slurry is a new type of low pollution substitute fuel to comply with the clean air act for industrial heat and power generation application. Research on slaked magnesium slag as a raw material and blend for portland cement. Municipal sewage sludge always includes considerable amount of water, noxious substances, and varying chemical compositions. Pulverized coal is mixed with water in a mixing tank, which contains one or more large rotating wheels or propellers that keep the particles uniformly mixed. Coal slurry pollution has also been blamed for rendering water undrinkable.
An evaluation of coal water slurry fuel burners and. Coalwaterslurries an overview sciencedirect topics. As blackwater cannot be purified by a water treatment plant. Study on characteristics of different types of nozzles for. The apparent viscosity increases with increasing concentration of coal water slurry, and decreases with increasing temperature. The first proposed project using wyoming coaland wyoming waterwas the etsi project. Arccoal can now make 600 barrels of fuel 25,200 gallons per day at its pilot plant in fredericksburg. Water requirements of various energy transportation alternatives alternatives gasification liquifaction mine mouth power plant wet cooling towers unit trains barges trucks conveyor belts pneumatic pipelines slurry pipelines c53% water m joule 26 to 57 11 to 72 305 nil nil nil nil nil 38 requirements tonnes water tonnes coal 0. To transform the coal ash into a slurry, coal is separated from noncombustable components and can be fractionated by particle size as well. Through examining properties of the coal slurry, the effects of amount of cationic monomer dmc, the concentration of initiator. In practice, the separation is significantly costly due to the large amounts of water needed and wastewater generated by the process.
Coal water slurry power plant, coal water slurry power. Hot air stove adopts the latest coal water slurry combustion technology and latest cyclone dust collection principle, enables full combustion of coal water slurry, once clear dust more than 98%, and gets more clean hot air through cyclone dust collection, meet the. Upgrading of low rank coal as coal water slurry and its utilization. The washing or purifying process reduces pollutioncausing contaminants in the coal, but these impurities then become part of the slurry. Content is available under creative commons attributionnoncommercialsharealike. Ideally, coal slurry consists only of crushed coal and water, which can be efficiently separated. Law stoichiometric relations on which the empirical reaction rates are based. Pdf the case of coal water slurry fuel for industrial use in.
Approximately 260 million gallons of the water and coal slurry discharged from two underground mine portals and affected over 75 miles of streams in kentucky and west virginia. Coal water slurry currently refers to the coalbased liquid fuel which reappeared in the 1970s when the world wide price of oil rose and the supply became scarce. Coal water slurry cws atomization involves interactions among three. One type of coal slurry, coal oil mixture com, is prepared by adding heavy oil to coal.
The effect of coal properties on the viscosity of coal. By lynn nystrom, college of engineering washingmachine science helps recover coal from slurry ponds appalachia is full of coal impoundments places where watersoaked ultrafine coal is discarded. Symbols as in figure 4 fuel, 1986, vol 65, february 173 combustion of coalwater slurry droplets. Introduction energy development, as well as improving energy security of russia is largely dependent on extensive and effective use of coal as an energy fuel. Several research works have been done concerning the production and use of cwss being developed. Pdf properties of sodium lignosulfonate as dispersant of. Properties of coal water slurry prepared with the solid and liquid. Coal water slurry currently refers to the coal based liquid fuel which reappeared in the 1970s when the world wide price of oil rose and the supply became scarce. The secondary purpose was to determine if the energy requirements to pipeline the coal water slurries could be predicted from the rheology data. The effect of coal properties on the viscosity of coalwater. Because of the current low interest in the fuel, arc coal is scheduling a shortterm shut down. The following assumptions were applied throughout the analysis in this paper. Components in slurry come from the coal and the chemicals used in processing it.
Depending on the direction of its use, the solid content the combustible component is from approx. Arc coal can now make 600 barrels of fuel 25,200 gallons per day at its pilot plant in fredericksburg. The ratio of water, gasoline and coal was optimized. In most every case, the pumps are required to handle muddy, acidic slurry of water, chunks of coal and coal fines, dust, dirt and rocks. A key decision made by mining executives has emptied one such pond near the small. Furthermore, the slurry consists also of very fine coal dust that results in a waste called blackwater. The company has produced about two million gallons of coalinwater fuel, which is better known as cws coal water slurry. Coal water slurry cws is a novel coal based fluid fuel, which is comprised of 65%70% pulverized coal, 30%35% water and 1%2% additive and physically processed. Coal companies say the sludge contains mostly water, rocks and mud.
Environmental problems associated with the use of coal fuel require the development of new effective coal technologies from economic and ecological points of views. The steel pipeline had an inside diameter of 10inches, and was designed to carry 150 tons of coal per hour. It is transported pneumatically by air and injected through burners fuelair mixing devices into the combustor. The environmental and pollution aspects of coal slurry pipelines. Mfcld coal fueled boiler, coal is dried and ground in grinding mills to facepowder fineness less than 50 microns. Request pdf desulfurization from bauxite water slurry bws electrolysis feasibility of highsulfur bauxite electrolysis desulfurization was examined using the electrochemical characterization.
Influence of cws properties including surface tension and apparent viscosity on atomization was studied. In this paper, a new brown coal utilization process, combining the techniques of coalwater slurry cws production and cws inline vaporization, was proposed. The coalwater slurry cws production with its future transportation and usage as energy fuel is one of the perspective ways of conversion of coal into a liquid. This paper is based on the research of the coal water slurry rheological property and stability. Coal water slurry cws is a novel coalbased fluid fuel, which is comprised of 65%70% pulverized coal, 30%35% water and 1%2% additive and physically processed. The fact that railroads are not presently required. Jun 18, 2014 the present paper describes the examples of experimental and industrial implementation of technologies of flamedroplet combustion of the coal water mixture in furnaces above a bed consisting of burning coal and in a swirlingtype furnace chamber. Li pengwei, yang dongjie, lou hongming, qiu xueqing. Davitt mcateer, former head of the federal mine safety and health administration, told al jazeera that it was hard to say exactly what lies in this particular coal slurry but that there are unwanted, potentially risky elements in raw coal. He further stated we are excited to integrate this low cost technology into our coal water slurry cws systems and into the natural gas production and maintenance programs. The slurrying properties of coal water slurries containing. Eighth international symposium on coal slurry fuels. Coal particles are micronized with a top size of about 250 m and a bimodal size distribution centered at 10 and 100 m for optimal maximum packing.
The influence of the concentration, additives and temperature on the rheological properties of the slurry has also been studied. Coal water slurry stove supplied by italian ceram srl. Coalwater slurry presentation2 coal fuels free 30day. Coal water slurry fuel cwsf is considered a feasible alternative to the heavy. Aqueous coal slurries comprising comminuted coal, water and oglycoside surfactant. The static stability was getting better for css, compared to coal water slurry cws. The optimum prescription of oilwatercoal slurry was obtained by means of orthogonal experiment. Slurry pipelines carry usually about 50 percent coal and 50 percent water by weight. Next, the slurry enters the pipeline as suction to pumps for forcing the slurry over long. A coalwater slurry pipeline has virtually no chance of experiencing spontaneous com bustion because of the lack of air and the high water content. Coal water slurry cws is a specific form of solid fuel of finely particulated grinded coal and water. Coalwater slurry fuel is a combustionable mixture of fine coal particles suspended in water. Jun 20, 2014 coal water slurry fuel cwsf or cws or cwf is a fuel which consists of fine coal particles suspended in water.
Coal water slurry production lineromiter machinery youtube. Fabrication and preparation of coalwater slurry dispersant with. Coal water slurry cws is a type of novel fuel prepared using a physical method to make the liquefaction of coal, and it is a highlyloaded suspension of coal particles in water, which contains about 6070% coal, 3040% water and a small amount of dispersant. A wide variety of coal water slurry power plant options are available to you, such as power station, industrial.
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