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首页> 外文会议>Air Waste Management Association's annual conference exhibition >LIGNITE FUEL ENHANCEMENT
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LIGNITE FUEL ENHANCEMENT

机译：褐煤燃料增强

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Project Goal and Objectives Our goal and objective is to significantly enhance the value of lignite as a fuel in electrical generation power plants within the next 5 years. Although current lignite power plants are designed to burn high-moisture coals (about 40%), a reduction in moisture content of 5 to 15 percentage points (about one quarter of the moisture content in the coal) will result in significant improvements. All fossil steam plants reject large quantities of heat in the cooling water used to condense steam. Engineering studies at Great River Energy (GRE) Coal Creek Station show that this waste heat could be used to lower the moisture content of the coal by at least 10 percentage points (or one quarter of the moisture in the coal). Reducing the moisture content of the coal will translate into the following benefits for the U.S.: ? Increasing the net generating capacity of units that burn high-moisture coal. ? Increasing the new energy supply of units that burn high-moisture coal. ? Increasing the cost-effectiveness of the nation’s electrical generation industry. ? Improving the environment by reducing emissions from coal-fired plants. ? Increasing the value of the nation’s lignite reserves. The cost benefits from improved plant performance, reduced emissions, and increased availability far out weigh the cost of drying the fuel. This work represents a potential landmark advance of fossil-steam plant performance improvement, emissions reduction and plant availability and is also applicable to Powder River Basin sub bituminous and biomass high moisture fuels as well. Efficiency, Environmental, and Economic Improvements 3 Existing technology is such that lignite and PRB power plants mechanically feed the asreceived coal into pulverizing mills and then blow it into the combustion chamber. This Lignite Fuel Enhancement Project proposes to demonstrate coal drying technology which will incrementally reduce the moisture content by about 25% (I.e., from about 40% to about 30%). Analyses and field-testing show that the removal of about one-quarter of the coal moisture results in: ? A substantial (about 5%) improvement in overall performance ? About a 25% reduction in mass emissions of SO2 and a 7% reduction in other pollutants such as CO2 , NOx, ash and mercury ? A conservative savings of about $3M per year for one 546MW unit at Coal Creek Station ? A potential economic savings of about $84M per year (15,000 MW of U.S. lignite power plants) ? A potential economic savings of about $840M per year (150,000 MW of U.S. PRB sub bituminous power plants) The economic savings quoted above are believed to be conservative because they do not include savings due to increased availability, capacity factor, pre combustion mineral removal and post combustion emission reductions other than SO2. Applied to 15 GW of lignite generation and 150 GW of PRB coal generation and assuming a future value for carbon at $10/ton (or $2.725/ton of CO2), the proposed coal drying technology offers a total potential saving due to CO2 reduction is nearly $3 billion per year. Even a modest penetration of the proposed technology into this generation base could ultimately return a very large cost saving due solely to reduction of CO2 emissions. Methodology The benefits of reduced-moisture-content lignite will be demonstrated at the GRE Coal Creek Station in Underwood, North Dakota. A phased approach will be used. In the first phase, a 2T pilot dryer will be tested. Types of dryers (fixed vs. vibratory), segregation of materials, quantify magnetic & air separation benefits, and optimize operational concerns as we scale-up to a 75T/hr prototype. The second phase will be the prototype dryer module, which will be fully integrated into one of the 546 MW units at the Coal Creek Station. Following successful demonstration of that dryer and the performance improvements as a result of it, GRE will design, construct, and perform full-scale longterm operational testing of a f
机译：项目目标和目标我们的目标和目标是大大提高了Lignite在未来5年内作为电发电厂燃料的价值。虽然目前的褐煤发电厂设计用于燃烧高湿度煤（约40％），但水分含量的降低5至15个百分点（煤中的水分含量约为四分之一）将导致显着的改进。所有化石蒸汽厂都拒绝了用于冷凝水的大量热量，用于冷凝蒸汽。大河能源（GRE）煤溪站的工程研究表明，这种废热可用于将煤的水分含量降低至少10个百分点（或煤中的水分四分之一）。降低煤的水分含量将转化为对美国的以下好处：增加燃烧高水煤的单位的净产生能力。还是增加燃烧高水煤的单位的新能源供应。还是提高国家电力发电业的成本效益。还是通过减少燃煤植物的排放来改善环境。还是增加国家褐煤储备的价值。从改善的植物性能，减少排放量和更高的可用性远远来重量，重量效益，权衡燃料干燥的成本。这项工作代表了化石蒸汽厂的潜在地标进展，减少了排放量和植物可用性，也适用于粉末河流域沥青和生物质高湿度燃料。效率，环境和经济改进3现有技术使得褐煤和PRB发电厂机械地将煤炭送入粉碎机，然后将其吹入燃烧室。这种褐煤增强项目提出展示煤干燥技术，其将逐渐将水分含量减少约25％（即，约40％至约30％）。分析和现场测试表明，除去大约四分之一的煤湿度：整体性能的大量（约5％）提高？ SO2的大规模排放量减少约25％，其他污染物如二氧化碳，NOX，灰和汞等污染物减少7％？在煤炭溪站的一个546MW单位的保守派节省约300万美元？每年约8400万美元的潜在经济储蓄（15,000兆瓦，美国紫拉特发电厂）？每年潜在的经济储蓄约为840米（美国PRB沥青发电厂的150,000兆瓦）上面引用的经济储蓄被认为是保守的，因为它们不包括由于可用性，容量因素，预燃烧矿物质预热和预燃烧矿物质的增加而储蓄超出SO2以外的燃烧排放减少。适用于15 GW的褐煤生成，150 GW的PRB煤炭产生，并假设碳的碳干燥技术为10美元/吨的碳价值（或2725美元），所提出的煤炭干燥技术由于二氧化碳减少而提供总潜力。几乎每年30亿美元。即使将建议的技术渗透到这一代群中，也可能最终返回由于减少二氧化碳排放而导致的非常大的成本节约。方法论在北达科他州北部的伍德伍德的Gre Coal Creek Station展示了减少水分含量褐煤的益处。将使用分阶段的方法。在第一阶段，将测试2T先导干燥机。干燥器类型（固定与振动器），材料的分离，量化磁性和空气分离效益，并在缩放到75T / HR原型时优化操作问题。第二阶段将是原型干燥器模块，它将完全集成到煤溪站的546 MW单位之一中。在成功演示该烘干机和由于它的结果的情况下，GRE将设计，构建和执行F的全规模延长操作测试

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