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我国为了控制大气中的氮氧化物污染,对工业烟气的排放提出了严格的要求,选择性催化还原烟气脱硝(SCR)技术因此被应用到了多种行业,如水泥厂、玻璃厂、发电厂。烟气脱硝(SCR)技术所采用的控制系统多种多样,文章就ABB DCS电气控制系统在玻璃窑炉SCR脱硝控制系统中的实际工程应用进行了分析。 相似文献
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降低NOx氮氧化物温室气体排放量,可减少对自然生态环境冲击,并避免暖化现象继续扩大。脱硝系统可分为三类,包括:低氮氧化物燃烧器(low NOx burner)、选择性非触媒还原法(selective non—catalytic reduction)与选择性触媒还原法(selective catalytic reduction,SCR),考虑到减少燃煤电厂氮氧化物排放的脱硝系统的性能特点,综合比较以SCR的处理效率为最高。 相似文献
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面对国家日益严格的氮氧化物(NOx)排放要求,闽东第一家热电厂选择低氮燃烧的CFB锅炉实现燃烧中脱氮,SNCR+SCR耦合技术实现深度脱硝,满足NOx排放浓度不大于50 mg/m^3的环保排放标准。开展了深度脱硝调整试验,发现了NOx排放浓度与旋风分离器进口烟气温度、烟气中氧含量、氨水消耗量的关系,并分析了深度脱硝技术对锅炉运行经济性的影响,探讨了机组高效、经济运行。 相似文献
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结合北京某供热厂29 MW燃气锅炉低氮改造工程,简要介绍了烟气再循环和选择性催化还原法(SCR)技术原理,详细说明了烟气再循环系统设置、燃烧器改造和SCR系统还原剂与催化剂选择依据。并根据环保监测烟气排放数据,指出现阶段可采用低氮燃烧器+烟气再循环技术作为燃气锅炉氮氧化物控制主流技术,SCR技术的应用可使锅炉高负荷时满足更低的氮氧化物排放要求。 相似文献
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《Planning》2015,(9)
氮氧化物是造成大气污染的主要污染源之一,其中的NO和NO2是重要的大气污染物,NOx大多数来自于煤炭的直接燃烧。本文介绍了火电厂脱硝技术,阐述了控制NOx排放的技术,分析了脱硝技术对锅炉运行的运行影响,提出了管理措施,并展望了未来的脱硝技术发展趋势。 相似文献
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现在水泥行业最主流的烟气脱硝技术是选择性非催化还原(SNCR)脱硝技术,但是其后期的运行成本比较高,一般2500t新型干法熟料生产线吨熟料运行成本在2.5~4元。由于近期水泥市场不景气,所以,运行脱硝设备对于水泥厂来说,无形的增加了他们的压力,因此,控制水泥回转窑中氮氧化物的生成,降低后期SNCR的运行成本,成为现在所有水泥厂希望采用的联合脱硝技术--低氮燃烧+SNCR。 相似文献
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燃气全预混燃烧污染物排放的研究 总被引:2,自引:2,他引:0
通过实验研究,分析了燃气全预混燃烧时,烟气中NOx与CO的体积分数随过剩空气系数及火孔热强度变化的规律.提出在NOx及CO生成的矛盾条件尚未形成时,烟气中NOx及CO的体积分数有同时降低的可能性,通过进一步的实验得到验证. 相似文献
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Mercury emissions from a coal-fired power plant in Japan 总被引:1,自引:0,他引:1
Yokoyama T Asakura K Matsuda H Ito S Noda N 《The Science of the total environment》2000,259(1-3):97-103
The emissions study for mercury was conducted at a 700 MW coal-fired plant for the combustion of three types of coal with mercury concentrations of 0.0063, 0.0367 and 0.065 mg/kg. The power plant is equipped with a cold-side electrostatic precipitator and wet type flue gas desulfurization system. During full load operation of the boilers, samples of the input and output streams such as coal, coal ash, ESP ash and post-ESP particulates and flue gas were collected. The Hg concentrations in solid were measured by cold-vapor atomic absorption spectrometry (AAS) after appropriate preparation and acid digestion. Gaseous Hg was collected using a mixed solution of potassium permanganate and sulfuric acid and the Hg concentrations in the samples were measured using cold-vapor AAS. The results were used to examine: (1) overall mass balances; (2) relative distribution in the power plant; (3) equilibrium of Hg species using MALT-2 calculation program; and (4) Hg concentrations in stack emissions. The mass balances estimated in this study were 100, 138 and 89%, respectively, for the coals. Total Hg concentrations in stack gas were 1.113, 0.422 and 0.712 microg(m3N), respectively, for the coals. More than 99.5% of the Hg in the stack emissions were in gaseous form and the proportion in particulate form was extremely low. The relative distribution of Hg in ESP, FGD and Stack ranged from 8.3 to 55.2%, 13.3 to 69.2% and 12.2% to 44.4%, respectively. The results indicated that factors other than the Hg concentration of coals and efficiency of pollution control devices might affect Hg emissions from coal-fired plant. The calculated equilibrium of the distribution of Hg species using the MALT2 program suggest that it is necessary to consider condensation mechanism to interpret the affect of Hg species on the variations of the removal efficiencies of Hg in the ESP. 相似文献
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Jun Lee S Seo YC Jurng J Hong JH Park JW Hyun JE Gyu Lee T 《The Science of the total environment》2004,325(1-3):155-161
Mercury emissions from various stationary combustion sources such as coal-fired power plants, oil-fired power plants, industrial utility oil boilers, iron manufacturing plants, and industrial waste incinerators, were measured. The US EPA (Environmental protection agency) method 101A and the Ontario hydro method were used to sample the mercury containing combustion flue gases, at the inlet of the air pollution control devices (APCDs) and at the stack. Collected samples of both gaseous and particulate forms were then analyzed using CVAA (cold vapor atomic absorption) type analyzer. Measurement results from the coal-fired power plant showed percentages of elemental mercury (Hg0) as high as 31.4% and as low as 9.5%. However, the content of Hg0 was in the range of 1.3-3.7% from the industrial waste incinerator. Differences in mercury speciation from various stationary combustion sources are believed to be coming from: (1) difference in the fuel types; (2) difference in the major flue gas compositions (ex. HCl and SOx); and (3) difference in the types of air pollution control devices (APCDs). When the measurement results obtained using different sampling methods were compared, the Ontario Hydro Method gave a slightly higher mercury concentration measurement than that of the US EPA Method 101A. 相似文献
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脉冲燃烧燃气锅炉的设计与测试 总被引:1,自引:0,他引:1
研究了输出热功率为100kW的脉冲燃烧燃气锅炉主要结构的设计,分析了锅炉测试过程中输出热功率、空气系数、烟气中CO和NOx体积分数随燃气压力变化的原因. 相似文献
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2.2.2.2电除尘器销售额增长速度缓慢,市场发展速度适中在八十年代中,电除尘器市场的增长速度比较缓慢,其销售额从1981年的1.15亿美元,增加到1986年的3.96亿美元,6年间增加了两倍多。到1986年,在所有大气污染控制装置中,电除尘器的销售额仅次于袋滤器,居第二位。自本世纪初电除尘器应用于工业以来,在电除尘器的理 相似文献
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脱硝粉煤灰是火电厂采用脱硝工艺减少NOx气体排放时的固体副产物,随着脱硝工艺的普及,脱硝粉煤灰将成为主要的粉煤灰种类,因此其综合利用具有重大的实际意义.主要研究了3种采集自不同电厂的脱硝粉煤灰以10%、20%、30%和40%掺入水泥中对水泥性能的影响,结果表明,脱硝粉煤灰对水泥性能的作用类似于普通粉煤灰,具有一定的减水作用,提高了水泥的流动度,但延长了水泥的凝结时间,并降低了水泥的早期强度,这些作用随着粉煤灰掺量的增加而增强.在设计粉煤灰掺量时必须考虑粉煤灰中CaO的含量,以保证水泥的安定性合格. 相似文献