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The economics of reburning with cattle manure-based biomass in existing coal-fired power plants for NO_x and CO_2 emissions control

机译:在现有燃煤电厂中以牛粪为基础的生物质进行再燃烧以控制NO_x和CO_2排放的经济学

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Coal plants that reburn with catttle biomass (CB) can reduce CO_2 emissions and save on coal purchasing costs while reducing NO_x emissions by 60-90% beyond levels achieved by primary NO_x controllers. Reductions from reburning coal with CB are comparable to those obtained by other secondary NO_X technologies such as selective catalytic reduction (SCR). The objective of this study is to model potential emission and economic savings from reburning coal with CB and compare those savings against competing technologies. A spreadsheet computer program was developed to model capital, operation, and maintenance costs for CB reburning, SCR, and selective non-catalytic reduction (SNCR). A base case run of the economics model, showed that a CB reburn system retrofitted on an existing 500 MW_e coal plant would have a net present worth of -$80.8 million. Comparatively, an SCR system under the same base case input parameters would have a net present worth of +$3.87 million. The greatest increase in overall cost for CB reburning was found to come from biomass drying and processing operations. The profitability of a CB reburning system retrofit on an existing coal-fired plant improved with higher coal prices and higher valued NO_x emission credits. Future CO_2 taxes of $25 tonne could make CB reburning as economically feasible as SCR. Biomass transport distances and the unavailability of suitable, low-ash CB may require future research to concentrate on smaller capacity coal-fired units between 50 and 300 MW_e.
机译:用牛生物量(CB)再燃的燃煤电厂可以减少CO_2排放并节省煤炭采购成本,同时比主要NO_x控制器所达到的水平将NO_x排放降低60-90%。用CB再燃煤所产生的减排量可与通过其他二次NO_X技术(例如选择性催化还原(SCR))获得的减排量相媲美。这项研究的目的是模拟使用炭黑再燃煤的潜在排放量和经济节省量,并将这些节省量与竞争技术进行比较。开发了一个电子表格计算机程序,以对CB再燃,SCR和选择性非催化还原(SNCR)的资本,运营和维护成本进行建模。经济学模型的一个基本案例表明,在现有500 MW_e燃煤电厂上进行改造的CB再燃系统的净现值为-8080万美元。相比之下,在相同的基本案例输入参数下,SCR系统的净现值将增加387万美元。发现炭黑再燃烧的总成本中最大的增长来自生物质干燥和加工操作。随着煤炭价格的上涨和NO_x排放信用额度的提高,对现有燃煤电厂进行CB再燃系统改造的利润得以改善。未来25美元/吨的CO_2税费可能会使CB的再燃烧与SCR一样经济可行。生物质的运输距离和合适的低灰分CB的缺乏可能需要未来的研究来集中研究容量在50至300 MW_e之间的较小容量的燃煤机组。

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