Essay On Air Dense Medium Fluidized Bed

Coal is the dirtiest of all fossil fuels. When burned, it produces emissions that contribute to global warming, create acid rain and pollute water. With all of the talk surrounding nuclear energy, hydropower and biofuels, you might be forgiven for thinking that grimy coal is finally on its way out. On the other hand, coal is no sooty remnant of the Industrial Revolution - it generates half of the electricity in the United States and will likely continue to do so as long as it's cheap and plentiful . Clean coal technology seeks to reduce harsh environmental effects by using multiple technologies to clean. Coal is a fossil fuel composed primarily of carbons and hydrocarbons. Its ingredients help make plastics, tar and fertilizers. A coal derivative, a solidified carbon called coke, melts iron ore and reduces it to create steel. But most coal - 92 percent of the U.S. supply - goes into power production .Electric companies and businesses with power plants burn coal to make the steam that turns turbines and generates electricity. When coal burns, it releases carbon dioxide and other emissions in flue gas, the billowing clouds you see pouring out of smoke stacks. Some clean coal technologies purify the coal before it burns. One type of coal preparation, coal washing, removes unwanted minerals by mixing crushed coal with a liquid and allowing the impurities to separate and settle. Other systems control the coal burn to minimize emissions of sulfur dioxide, nitrogen oxides and

Emmanuel and his mother live in an urban community-housing complex. The building is worn down and dirty from the urban dust, cockroaches, and mold. Emmanuel is five years of age and has suffered from asthma for the last two years. One evening, his mother poured him some milk and put him to bed. Shortly afterward, Emmanuel woke up wheezing and coughing. As he gasped for air, he became more and more anxious. His mother ran for his inhaler, but he was too upset and restless to use it. Emmanuel’s skin became moist with sweat, and as he began to tire, his wheezing became quieter. His mother called 911 and waited anxiously for the ambulance to arrive.

Clean coal technology usually addresses atmospheric problems resulting from burning coal. Historically, the primary focus was on sulfur dioxide and particulates, since it is the most important gas in the causation of acid rain. More recent focus has been on carbon dioxide (due to its impact on global warming) as well as other pollutants. Concerns exist regarding the economic viability of these technologies and the timeframe of delivery, potentially high hidden economic costs in terms of social and environmental damage, and the costs and viability of disposing of removed carbon and other toxic matter. More, the byproducts of coal power production range from fly ash sludge ponds full of mercury, arsenic, and sulfur in unlined ponds that can leak into the water supply.

Coal ash is known to contain a number of different toxic metals, the exact content dependent upon the coal it is formed from. Containing this potential pollution hazard is an expensive problem, as approximately 75% of all ash generated is stored in landfills. In these sites, rainwater can leach out toxic metals including mercury, arsenic, cadmium, chromium, molybdenum, lead and selenium. As over 500 million tons of ash are produced each year, there’s an increasing environmental health hazard to the surrounding water systems of these landfills. Pollution can spread to municipal water systems and potentially poison humans. As such, figuring out a better solution to deal with the unused coal ash is of significant importance. Current uses of coal ash primarily include the formation of concrete due the pozzolanic properties of coal

“Blasting itself produced immense quantities of mineral particles. The common practice of returning to the work face soon after the detonation of charges meant entering an area filled with particulate matter. (Derickson 3)” Also, as labors transported, unloaded, and cleaned the extracted material dust was inhaled even though they were away from the mine. So no matter what technique used the coal dust still made it in the air and into the miners’ lungs. There were no safety regulations in place about how long to wait after blowing up coal, no regulations about how many particulates in the air were safe, no mask or safety precautions and no mandatory venting. Although some of these things were easily usable to the safety the company felt it was too costly. “An elaborate system of fans and blowers was ‘too costly’, so the miner had to pay for the bad ventilating by ‘miners’ asthma’ and other ailments caused by bad air. (Derickson 4)” Basically the coal operators did not care enough about the miners safety to provide vents and things that could have helped the air quality.

The igneous intrusions in the Raton Basin provide a high temperature and pressure environment promotes an increase in generation of gas (Jian and Cheng, 2014). No evidence suggests that the different intrusions within the coal were at different temperatures (Rooper et al., 2006). It has been suggested that the heat from the dikes enhance adsorption and porosity in coals and also increase the trap capacities of gas storage (Jian and Cheng, 2014). Igneous intrusions create safety problems in the mines underground and the gas created could result in the projection and rapid release of gases (Jian and Cheng, 2014).

George Z. Peng and Paul W. Beamish wrote this case solely to provide material for class discussion. The authors do not intend to

“Power plants use flue gas desulfurization equipment, also known as scrubbers, to clean sulfur from the smoke before it leaves their smokestacks. In addition, industry and the U.S. government have cooperated to develop technologies that can remove impurities from coal or that can make coal more energy-efficient so less needs to be burned.” (Coal).

-Expected to reduce mercury emissions from electrical power generation by about 40% by 2020 and 65% by 2030 compared to 2005 levels, and could reduce mercury emissions by up to 96% by 2050.

Coal’s reputation has become as black as coal itself, but without it the quality of life that hundreds of millions of people enjoy today would not be possible. Coal has been used in many ways throughout history and it will continue to be a vital resource in supplying the energy needed to fuel an energy hungry world. Research cited throughout this paper suggests that coal is an energy source for the future because it is stable and reliable with abundant reserves, it is the most affordable and efficient fuel source used to produce power, and because of new clean coal technologies, coal can be burned with minimal to no damage to the environment.

Huntley Colliery has a modern dense medium cyclone and froth flotation type washery to prepare the saleable coal. It is capable of separating the different quality coal products from high grade coking coal and the various grades of steaming coal. Throughput of this plant is rated at 400 tonnes per hour and has worked at an average of one million tonnes per annum on a two shift operation setting.

Hydraulic Fracking is an oil and gas extraction process used in the past 60 years. The process consists of drilling the underground until reach a shale layer, and them a high-pressure fracking fluid is injecting in this hole to fracture the rock underground, which will provide oil and gas to be extracted. As a huge extraction process it requires large quantities of water, sand and chemicals, which are to produce the fracking fluid, and in most of the cases all this water and chemicals are through away causing a huge environmental impacts. Although, all those environmental issues, the oil and gas industry will not stop its production due to it high productivity and cost benefit, so alternative processes have been developed to treat this water and chemicals used in the fracking process. The purpose of this report is to analyse the effectiveness and viability of those methods.

Coal is currently one of the world’s largest sources of energy. There are different types of coal which are peat, lignite, bituminous and anthracite. Brown coal (lignite) is a combustible sedimentary rock that is found in the layers under the earth. Brown coal is the lowest grade of coal and is soft due to the water content. Since brown coal is high in moisture and is combustive, it was uneconomical to transport, but currently available drying techniques makes it easier to transport. A question that has been raised over the years is whether power stations which use brown coal should be closed.

When coal is being transported by rail it should be placed in dead storage in order to minimize air pollution due to dust, this involved compacted and sealed pile not susceptible during wind activity. when transporting coal, the unit/agency should ensure that trains is showered with water with adequate system before leaving the storage yard, the coal should be covered with tarpaulin or any other effective measure/device. Another safety precaution that one should adhere to when transporting coal via rails is to ensure that trains are not overload because it will cause spillage during transportation

After the coal has been removed form the earth, it is still not ready for use; it must first be refined. Coal must first be separated form foreign materials, for example other minerals, to be considered useful to us. One way of doing this is called coal washing. The coal is first crushed into smaller pieces, and then a liquid is used to separate the coal based on density. Coal that is higher in density harbors more ash, so is left behind, whereas low-density coal has contains little ash and is more desirable. Another process to separate coal from foreign materials is call dry-shaling, which works without the use of liquid. After being separated, coal can be processed into coke, and eventually steel. When coal is transported, it can be by means of truck, train, or ship, and can go nearly anywhere. Truck and train transportation are the cheapest forms, particularly train if you are shipping a great amount, and ships are used for overseas transport.