Organic Sulfur Reduction on Lignite Coal Using Multistage This study focuses on the biodesulfurization of lignite specifically the reduction of organic sulfur, namely aliphatic mercaptans/thiols via bioprocess methods. The process was conducted by using multistage artificial biotreatment A-Bmt and Pseudoclavibacter sp. SKC/XLW-1 strains as biocatalysts. The aims are to improve the recovery of clean coal by reducing the organic sulfur both in
Coal and the environment Reducing the environmental effects of coal use. The Clean Air Act and The Clean Water Act require industries to reduce pollutants released into the air and water. The coal industry has found several ways to reduce sulfur and other impurities from coal.
Mercury and coal The proposed standards should reduce mercury emissions from power plants burning coal and oil by 91 percent, acid gas pollution by 91 percent, direct particulate matter emissions by 30 percent, and sulfur dioxide SO2 emissions by 53 percent, down to 2.1 million tons of annual SO2 emissions.
Lignite Drying: New Coal-Drying Technology Promises Higher Lignite Drying: New Coal-Drying Technology Promises Higher Efficiency Plus Seven Trustr Costs and Emissions 07/01/2007 Dr. Sai Gollakota sai.gollakota netl.doe.gov is a project manager with NETL.
Desulfurization of Coal 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, in-bed desulfurization, and flue gas desulfurization.
10 Some Methods of Reducing Sulfur Oxides from Power Summary. Most of the sulfur that was in the coal appeared in the producer gas as hydrogen sulfide. Since air pollution from sulfur oxides was not considered a problem at the time, the hot gas was burned with the hydrogen sulfide still in it. In a few installations the hydrogen sulfide was removed.
Chemical reduction of sulphur dioxide to free sulphur with The chemical reduction of SO2 with North Dakota lignite has been discovered to be a facile reaction which occurs at a relatively low temperature of 600 650 C. Under optimum conditions, the reaction chemistry can be controlled to allow 85 90% conversion of SO2 to free sulphur in a single-stage reaction.
What is Lignite? Characteristics of Lignite Coal. Ash varies up to 50 percent by weight. Lignite has low levels of sulfur less than 1 percent and ash approximately 4 percent , but it has high levels of volatile matter 32 percent and higher by weight and produces high levels of air pollution emissions. Lignite has a heating value of approximately 4,000 to 8,300 Btu per pound.
Lignite Drying: New Coal-Drying Technology Promises Higher Reduces unit NO x emissions by increasing lignite’s heating value and reducing the flow rates of coal and primary air to pulverizers.
US3823676A A method of reducing sulphur dioxide emissions from coal by adding an effective amount of Wyoming Trona to the coal for combining with sulphur in the coal to form a relatively heavy ash which is collected with other heavier ash for removal in the usual way.
Reduction of Sulfur Dioxide Emissions by Burning Coal Blends Reduction of Sulfur Dioxide Emissions by Burning Coal Blends. Such cofiring intends to take advantage of documented evidence in previous investigations at the author's laboratory, which demonstrated that lignite coals of low-sulfur, high-calcium, and high-sodium content undergo massive bulk fragmentation during their devolatilization.
Innovative Drying Technology Extracts More Energy from At the Coal Creek Station, the technology increased the energy content of the lignite from 6,200 to 7,100 Btus per pound, thereby reducing fuel input into the boilers by 14 percent. At the same time, sulfur dioxide and mercury emissions were reduced by more than 40 percent, nitrogen oxide by more than 20 percent, and carbon dioxide by 4 percent.
Coal Creek Station Lignite Energy Council In 2009, Coal Creek Station completed the addition of new technology for reducing moisture content in lignite. Because the refined coal burns hotter and more efficiently, less coal is needed to generate the same amount of power, which results in fewer sulfur dioxide, nitrogen oxide, mercury and carbon dioxide emissions.
Process for removing sulfur from coal Patent DOE Patents A process for reducing the sulfur content of coal comprises: 1 contacting an aqueous slurry of coal-oil agglomerates at elevated temperature with oxygen; and 2 recovering coal-oil agglomerates wherein the coal has reduced sulfur content.
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US4226601A Therefore, while some reduction in the amount of sulfur containing air contaminants will be achieved by mixing the specified inorganic materials with the coal or lignite when the coal or lignite has a relatively large particle size, it is desirable to reduce the particle size of the coal or lignite prior to the combustion process and to intimately admix the small particle size coal or lignite with the inorganic material prior to such combustion.
Process for removing sulfur from coal Patent DOE Patents A process is described for reducing the sulfur content of coal comprising the steps of: 1 contacting coal particles with an aqueous solution of iron complexing agent, and an oxidant to preferentially oxidize at least a portion of the sulfur in the coal; 2 thermally treating the oxidized sulfur-containing coal at elevated temperature to reduce the sulfur content of the coal; and 3
Chemical reduction of sulphur dioxide to free sulphur with We recently reported the chemical reduction of SO-i to free sulphur with lignite and other ranks of coal'. The higher reactivity of lignite with SO;, combined with the absence of tar formation, has permitted a facile process for SOz reduction to free sulphur in high yield at a temperature of 600-800.