共查询到19条相似文献,搜索用时 140 毫秒
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一种处理烟气的新方法:脉冲电晕等离子法 总被引:4,自引:0,他引:4
脉冲电晕等离子法烟气脱硝是近年来发展起来的一种物理和化学相结合高新技术,具有广阔的应用前景。本文介绍了脉冲电晕等离子法的电源和电极结构,阐明了此法烟气脱过脱硝的原理,去除效率及其影响因素,并提出了今后研究的方向和前沿课题。 相似文献
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对烟气脱硝技术在玻璃熔窑的应用现状及研究情况进行分析与讨论。SCR烟气脱硝技术具有脱硝效率高、技术成熟的优点,在玻璃熔窑得到广泛应用。但是该技术存在工程投资高、催化剂活性易受烟气影响等缺点。目前国内正在研发的玻璃熔窑烟气同时脱硫脱硝技术,具有设备精简、工程投资少等优点,但还存在一些问题及不足。随着技术的发展,以NaClO氧化法为代表的同时脱硫脱硝新技术与现有技术的联合应用,将成为玻璃熔窑烟气脱硝技术的发展方向。 相似文献
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电子束法烟气净化技术是近年来发展较快的一项烟气净化技术。在清华大学核能技术设计研究院的电子束法烟气净化装置的实验基础上,通过对大量实验数据的分析,找出工艺中各种因素对脱硫率与脱硝率的影响。辐照剂量[D]、烟气温度[T]、含湿量[H]、注氨当量[α]、SO2的初始浓度[CSO2]和NOx的初始浓度[CNOx]是影响烟气脱硫脱硝的基本因素。文章采用相关分析、回归分析的方法,找出主要的因素,建立回归经验方程,以优化系统工艺,简化系统结构,预测实验结果。 相似文献
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烟气脱硫是目前国际上广泛采用的控制二氧化硫的成熟技术,其中半干法烟气脱硫工艺在电厂烟气脱硫装置中占到20%~30%。该工艺的核心是将燃煤烟气绝热增湿,以促进氢氧化钙与二氧化硫反应而进行的。其衡量指标之一为烟气相对湿度,烟气湿度大,烟气脱硫效果好,但不利于烟气排放。为此,本文分析了相对湿度的概念、对脱硫的影响,同时分析了相对湿度对烟气监测的影响,并提出了相应的解决办法。 相似文献
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解析电除尘烟温与粉尘特性的最佳结合点 总被引:2,自引:0,他引:2
分析了电除尘烟温对粉尘特性的影响,以及烟温对电除尘器效率的影响,从中找出烟温调节与粉尘特性的最佳结合点。利用烟温调节的理念,应用余热利用节能电除尘技术对电除尘器进行提效改造,通过实例证明,这既可扩大电除尘器适应性和提高电除尘效率、满足低排放要求,又可节省电煤消耗和降低电耗,具有环保与经济的双重效益。 相似文献
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The goal of this paper is to find methodologies for removing a selection of impurities (H2O, O2, Ar, N2, SOx and NOx) from CO2 present in the flue gas of two oxy-combustion power plants fired with either natural gas (467 MW) or pulverized fuel (596 MW). The resulting purified stream, containing mainly CO2, is assumed to be stored in an aquifer or utilized for enhanced oil recovery (EOR) purposes. Focus has been given to power cycle efficiency i.e.: work and heat requirements for the purification process, CO2 purity and recovery factor (kg of CO2 that is sent to storage per kg of CO2 in the flue gas). Two different methodologies (here called Case I and Case II) for flue gas purification have been developed, both based on phase separation using simple flash units (Case I) or a distillation column (Case II). In both cases purified flue gas is liquefied and its pressure brought to 110 atm prior to storage.Case I: A simple flue gas separation takes place by means of two flash units integrated in the CO2 compression process. Heat in the process is removed by evaporating the purified liquid CO2 streams coming out from both flashes. Case I shows a good performance when dealing with flue gases with low concentration of impurities. CO2 fraction after purification is over 96% with a CO2 recovery factor of 96.2% for the NG-fired flue gas and 88.1% for the PF-fired flue gas. Impurities removal together with flue gas compression and liquefaction reduces power plant output of 4.8% for the NG-fired flue gas and 11.6% for the PF-fired flue gas. The total amount of work requirement per kg stored CO2 is 453 kJ for the NG-fired flue gas and 586 kJ for the PF-fired flue gas.Case II: Impurities are removed from the flue gas in a distillation column. Two refrigeration loops (ethane and propane) have been used in order to partially liquefy the flue gas and for heat removal from a partial condenser. Case II can remove higher amounts of impurities than Case I. CO2 purity prior to storage is over 99%; CO2 recovery factor is somewhat lower than in Case I: 95.4% for the NG-fired flue gas and 86.9% for the PF-fired flue gas, reduction in the power plant output is similar to Case I.Due to the lower CO2 recovery factor the total amount of work per kg stored CO2 is somewhat higher for Case II: 457 kJ for the NG-fired flue gas and 603 kJ for the PF-fired flue gas. 相似文献
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活性炭烟气脱硫技术研究新进展 总被引:3,自引:0,他引:3
研制了新型活性炭脱硫剂-脱硫活性碳纤维。研究表明,脱硫活性碳纤维由于含碳量高、比表面积大、微孔丰富、孔径分布窄、有较多适于吸附SO2的表面官能团,因而吸附能力及吸附、脱附速度显著大于普通活性炭。在相同工艺条件下,脱硫活性碳纤维吸附容量为粒状疾性炭的4-5倍,空速粒达活性炭的10倍。采用活性碳纤维脱硫可比普通活性碳脱硫剂用量成倍减少。另外,由于活性碳纤维阻力小,系统能耗可显著降低。活性碳烟气脱硫采用 相似文献
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在分析我国煤炭资源状况、煤中硫的赋存状态和燃煤引起的SO2污染状况的基础上,探讨了国内外控制SO2排放的研究现状,研究了燃烧前、燃烧中和燃烧后三大类脱硫方法的可行性与适用范围。研究认为,对洗选脱硫要先对煤中硫的赋存状态进行研究,否则效率难以得到保证;固硫剂脱硫比较适合我国国情,但脱硫效率有待提高。固硫剂脱硫和洗选脱硫可结合使用,以提高脱硫率。 相似文献
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Teerawat Sanpasertparnich Raphael Idem Irene Bolea David deMontigny Paitoon Tontiwachwuthikul 《International Journal of Greenhouse Gas Control》2010,4(3):499-510
Post-combustion CO2 capture and storage (CCS) presents a promising strategy to capture, compress, transport and store CO2 from a high volume–low pressure flue gas stream emitted from a fossil fuel-fired power plant. This work undertakes the simulation of CO2 capture and compression integration into an 800 MWe supercritical coal-fired power plant using chemical process simulators. The focus is not only on the simulation of full load of flue gas stream into the CO2 capture and compression, but also, on the impact of a partial load. The result reveals that the energy penalty of a low capture efficiency, for example, at 50% capture efficiency with 10% flue gas load is higher than for 90% flue gas load at the equivalent capture efficiency by about 440 kWhe/tonne CO2. The study also addresses the effect of CO2 capture performance by different coal ranks. It is found that lignite pulverized coal (PC)-fired power plant has a higher energy requirement than subbituminous and bituminous PC-fired power plants by 40.1 and 98.6 MWe, respectively. In addition to the investigation of energy requirement, other significant parameters including energy penalty, plant efficiency, amine flow rate and extracted steam flow rate, are also presented. The study reveals that operating at partial load, for example at half load with 90% CO2 capture efficiency, as compared with full load, reduces the energy penalty, plant efficiency drop, amine flow rate and extracted steam flow rate by 9.9%, 24.4%, 50.0% and 49.9%, respectively. In addition, the effect of steam extracted from different locations from a series of steam turbine with the objective to achieve the lowest possible energy penalty is evaluated. The simulation shows that a low extracted steam pressure from a series of steam turbines, for example at 300 kPa, minimizes the energy penalty by up to 25.3%. 相似文献