Larger numbers of cations and anions were dissolved into the liquid product and reduced the surface tension. Preparing the liquid and solid products of htd for coal water slurry cws could recover the energy and get rid of wastewater effectively. Apr 07, 2020 coal slurry is a waste product of coal mining and processing, and contains both liquid and solid constituents. Crushed coal can be transferred by pipeline when water is added, creating a coal slurry.
Preparation of coalwater slurry and power units for its combustion orig i nal sci en tific pap er udc. First, the coal is pulverized to a powder consistency, then mixed with an equal weight of water to form a slurry. The engine, in a minimally modified form, has been operated for several hours on a slurry of 50 percent by mass coal in water. Unlike coal water slurry, however, coal co 2 slurry cannot be prepared at ambient pressure. 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. The very first application for red valve pinch valves was on the worlds first coal slurry pipeline. Micronized coal water slurry advantages of cwf as a liquid, cwf has inherent advantages over solid coal. Water quality characterization of an eastern coal slurry.
Development of coal gasification technology in china world. Coal slurry can be transferred by pipeline or with specialized pumps such as a. To transform the coal ash into a slurry, coal is separated from noncombustable components and can be fractionated by particle size as well. 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 following assumptions were applied throughout the analysis in this paper. Today, more than 50 years later, coal handling remains a popular application for many red valve pinch valve products. But it also contains carcinogenic chemicals used to process coal and toxic heavy metals that are present in coal, including arsenic, mercury, chromium.
Comparative assessment of water use and environmental. Coalwater slurry is prepared in a conventional slurry preparation unitat ambient conditions. Sedimentation in coalwater slurry pipelining fabio rosso dipartimento di matematica ulisse dini, university of firenze, italy this work was partially supported by the c. The steel pipeline had an inside diameter of 10inches, and was designed to carry 150 tons of coal per hour. All structured data from the file and property namespaces is available under the. The method is based on the multiple impacts in a liquid media by dispersing elements in the appearance of cavitation effects. Influence of different dispersants on rheological behaviors of coal water slurry prepared from a low quality coal article pdf available in rsc advances 956. It is the authors premise that a blend of plant coal and recovered waste coal fines can be used to produce a coalwater slurry fuel with the desired combustion characteristics required by the industry. Coal water slurry fuel cwsf or cws or cwf is a fuel which consists of fine coal particles suspended in water. Ignition of the coalwater slurry containing petrochemicals. The secondary purpose was to determine if the energy requirements to pipeline the coalwater slurries could be predicted from the rheology data. Study of pyrolysis of brown coal and gasification of coal. While com is convenient for burning and while it was tested before cwm. Comparative assessment of water use and environmental implications of coal slurry pipelines by richard n.
Geological survey of water use in the conversion and transportation of the west s coal, an analysis of water use and environmental implications of coalslurry pipeline transport is presented. Coal sludge impoundments, or ponds, can store billions of gallons of liquid coal waste known as sludge or slurry. Basi cally, coal slurry pipelining is a means of transporting coal that involves mix ing pulverized coal with water and pumping it in a steel pipeline as shown schematically in figure 1. Penn state and doe have entered into a cooperative agreement to determine if cwsfs prepared from cleaned coal containing. The present article describes a method of preparation coal water slurry using a high speed mixerdisperser hsmd. Jul 26, 2016 were looking at the brushy fork impoundmenta massive dam holding back 7. The key challenge posed by the wastes under study is their poor reactivity they require more power resources for sustainable. Coal water slurry production lineromiter machinery youtube. Coal log pipelines use coal that has been compressed into logs with a diameter 5 to 10% less than the diameter of the pipeline and a length about twice the diameter of the pipeline.
Mathematical modeling of ignition of droplets of coal. 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. Inspectors are testing the water along a portion of a creek in west virginias eastern kanawha county after a coal slurry line spill tuesday, officials said. Coal slurry pollution has also been blamed for rendering water undrinkable. Coal water slurry is pumped out and sent to belt press filters to force out water. One type of coal slurry, coal oil mixture com, is prepared by adding heavy oil to coal. Particles of coal, water and chemicals used to prepare coal for market make up the slurry. Results are given for slurry atomization and combustion testing and analyses performed at conditions typical for gas turbine applications.
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. Apr 20, 2017 a coal slurry spill on march 23, 2017, leaked approximately 5,400 gallons of coal slurry into crooked run, a tributary of the coal river. A key decision made by mining executives has emptied one such pond near the small. Because of the current low interest in the fuel, arccoal is scheduling a shortterm shut down of its fredericksburg plant this summer. The coal water slurry is a substitutive fuel with immense potential application in industrial and steam power plant boilers with significant cost savings and ease of handling. The pennsylvania state university is conducting a coal water slurry fuel cwsf program with the us department of energy doe and the commonwealth of pennsylvania to determine the viability of firing cwsf in an industrial boiler designed for heavy fuel oil. Life cycle cost analysis of coal water slurry process in indonesia proceedings of academics world 51st international conference, bangkok, thailand, 16th17th november 2016, isbn. Coalwater slurry fuel was made in a ball mill which pulverised the coal or coal sludge. Coalwater slurry operation in an emd diesel engine. This is different than another slurry, coal water mixture cwm, a mixture of coal and water. Simulations of a hypothetical slurry pipeline of mile length transporting 12. Engine operation was achieved in this configuration using a pilot injection of diesel fuel to ignite the main charge of slurry. Water used for washing the rock is fed into special tanks, where coal particles are deposited.
A wet residue water and coal mixture is known as a filter cake. Coal slurry is a mixture of solids mined coal and liquids water or organic produced by a coal preparation plant. Penn state and doe have entered into a cooperative agreement to determine if cwsfs prepared from cleaned coal containing approximately 3. To address this problem, we study the ignition characteristics and conditions for coalwater slurries cws based on these wastes. Were looking at the brushy fork impoundmenta massive dam holding back 7. Jun 20, 2014 coal water slurry production line is for making coal water slurry from coal. The first proposed project using wyoming coaland wyoming waterwas the etsi project. Relations among main operating parameters of gasifier in igcc. Slurry pipelines use a slurry of water and pulverized coal. Research on caloric characteristic of producing coal water.
Suitable methods of processing coal slurry for reuse or return to the environment have not been. Based on the wender coal model, the processes of brown coal pyrolysis and coal. Geological survey open file report 77698 august 1977. Coalwater slurry fuel cwsf normally consists of 5070 percent pulverized or micronized coal. The effect of ultrafine grinding of coal in reducing fly ash particle size has been experimentally confirmed by studies sponsored by northeast coal utilization project and coalwater slurry. The slurries consisted of 6 x 10, 100 x 200, and 200 x 0 mesh coal in water.
The term liquid co 2 is used to refer to co 2 with a liquidlike density, even though the pressure may be above the. Coal slurry is a waste product of coal mining and processing, and contains both liquid and solid constituents. Coal water slurry production line is for making coal water slurry from coal. This paper presents preliminary results of a program to investigate the key technologies for burning coal water slurries in gas turbines.
The average size of the coal dust particles in filter cake is less than 100 microns. 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. The fixedviscosity concentration of cws increases from 44. Preparation of coalwater slurry and power units for its. Pdf influence of different dispersants on rheological. Coal water slurry fuel cwsf or cws or cwf is a fuel which consists of fine coal particles suspended in. Gp model 102803 page 2 of 23 certain solid materials e. Pdf coal water slurry in energy sector researchgate.
View enhanced pdf access article on wiley online library html view download pdf for offline viewing. Indiana center for coal technology research 2 cctr there are two main processes. Washingmachine science helps recover coal from slurry ponds. 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. A fourth slurry consisted of a mixture of the 6 x 10 and 200 x 0 mesh coal. Coalwater slurry operation in an emd diesel engine journal. The system model of gasification unit with coal water slurry gasifier was simulated and calculated using thermoflex software, and the relations of oxygen coal ratio roc, water coal ratio rsc, gasification pressure, gasification temperature and cold gas efficiency were mostly. The pennsylvania state university is conducting a coalwater slurry fuel cwsf program with the us department of energy doe and the commonwealth of pennsylvania to determine the viability of firing cwsf in an industrial boiler designed for heavy fuel oil. The omb coal water slurry gasification technology advantages include high carbon conversion rate, facilitation of largescale processing, and stable and safe operations.
Kihm department of mechanical engineering, texas a&m. Coalwater slurry presentation2 free download as powerpoint presentation. It was the worlds first longdistance commercial coal pipeline, designed to carry a slurry of half water and half finescreened coal from a vast open pit mine near georgetown, ohio to an electricity generating plant near cleveland, ohio. The lack of effective technologies to use coal processing waste and waste flammable liquids is a major research and development problem. The pipeline had three intermediate pumping stations. This paper presents preliminary results of a program to investigate the key technologies for burning coalwater slurries in gas turbines. 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.
Properties of coal water slurry prepared with the solid. When in the pipeline, the slurry moved along at a leisurely four miles an hour. Coal sludge contains a scary assortment of chemicalsfrom manganese to cadmium, lead and mercury and more. It is pumped to the same pressure as that of the liquid co 2 stream available for slurry preparation. The effect of coal properties on the viscosity of coal. A coal slurry spill on march 23, 2017, leaked approximately 5,400 gallons of coal slurry into crooked run, a tributary of the coal river.
Suitable methods of processing coal slurry for reuse or return to the environment have not been implemented, so the waste is held in storage in above ground ponds or pumped into workedout. First, the coal is pulverized to a powder consistency, then mixed with an equal weight of. Penconsulting promotes coal water slurry application to fuel power generation penconsulting has engaged in studies for the commercial application of coal water slurry cws to provide clean coal based fuel for industrial boilers and steam turbine power plants in indonesia, utilizing indonesia produced coal. Coalwater fuel production at united coal is on a smaller scale than at arccoal, and be cause they supply their own coal for testing, fewer. The omb coal water slurry gasification technology is one of the three internationally recognized coal gasification technologies, ranking with those of shell and ge. Coal companies say the sludge contains mostly water, rocks and mud. Studies on coalwater slurries cwss have been conducted for many years to replace fuel oil. In this research project, the effect of coal properties on cwss have been investigated using two turkish coals of different ranks and a siberian bituminous coal. It can be used to power boilers, gas turbines, diesel engines and heating and power stations. 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. The coalwater slurry fuel was transported through a pipeline to novosibirskaya tec5, novosibirsk, a distance of 262 km 163 mi. Preparation of coal water slurry and power units for its combustion orig i nal sci en tific pap er udc. 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. The effect of coal properties on the viscosity of coalwater.
826 25 974 1101 875 1547 1215 814 53 855 510 163 989 751 39 1085 409 1038 1544 1373 726 608 1078 401 114 638 1042 155 507 17 668 234 1444