共查询到18条相似文献,搜索用时 856 毫秒
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利用AERMOD模型预测了我国东部某电厂"上大压小"项目污染物排放对评价区域大气环境的影响。结果发现,受厂址东南山体影响,SO2、NO2小时最大落地浓度分别为环境空气质量二级标准的552.00%和1223.33%,NO2日均最大落地浓度为环境空气质量二级标准的117.50%。据统计,SO2小时贡献值超过标准时次为1次;NO2小时贡献值超过标准时次为5次,超标发生的概率均较低。预测超标原因主要与预测模型中烟羽遇到山体后的烟羽分层简化处理与实际烟羽运行状况存在一定差异有关。 相似文献
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火电厂石膏雨治理方案的研究与应用 总被引:1,自引:0,他引:1
采用石灰石—石膏湿法烟气脱硫工艺的火电厂,在湿烟囱排放过程中易出现石膏雨现象.分析了石膏雨形成的原因,并从运行调整的角度分析了缓解石膏雨的有效措施,提出了通过调整除雾器和吸收塔浆液喷嘴布置消除石膏雨的改造方案. 相似文献
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1982年8月投运的容量为23万千瓦的 Volklingen 发电厂是欧洲第一座100%烟气进行脱硫而无烟气旁路的发电厂。烟气脱硫系统是冷却塔的一个组成部分,烟气通过冷却塔排放,没有烟囱。现在冷却塔排出混合气体的数字扩散模式已经地面浓度测量值验证。扩散形态是根据废气排放的部分测量值记录的,其中包括从带动力的滑翔机上所作的测量。结果表明,与脱硫烟气单独通过烟囱排放相比,这种扩散方式具有更好的条件,一个主要因素是冷却塔排气具有热冲力。因为它不需要象联邦德国传统的烟囱排放烟气脱硫系统那样,必须再把排气加热到72℃,所以这种排放方式大大地降低了费用。 相似文献
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为了解决不设置烟气加热设备(以下简称GGH)后电厂主烟囱防腐和烟道改造施工而影响机组正常运行这一难题,在脱硫塔顶部设置临时烟囱排放烟气。以安阳电厂烟气脱硫工程为实例,从工艺、环境影响、制造和施工安装等方面具体介绍了脱硫吸收塔临时烟囱的设计,为不设GGH的脱硫技改工程提供参考。 相似文献
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我国现行标准的烟气抬升高度计算方法中所采用的烟囱温降值偏大于理论值和实测值。个别火电厂烟囱温降较大的原因系漏风所引起,但在烟气抬升高度计算中不引入漏风量则毋需考虑漏风温降。为此建议对现行“火电厂大气污染物排放标准”(GB13223-1996)中的烟囱温降取值进行修改。 相似文献
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火电厂湿法脱硫石膏雨和白雾治理措施及效果分析 总被引:1,自引:0,他引:1
安装有湿法烟气脱硫装置的火电厂一般都存在石膏雨及白雾现象,从烟气的成份与状态出发阐述了石膏雨及白雾的表现形态,并从吸收塔、烟道及烟囱、环境3个环节分析了石膏雨及白雾现象形成的途径,以及净烟气中固体颗粒、液态水、烟道冷凝水、烟囱冷凝水、环境冷凝水和白雾等6个治理要素,系统地从吸收塔、烟道及烟囱环节提出了石膏雨及白雾现象治理的措施,并分析了各种措施的优缺点及效果。 相似文献
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泡沫玻璃砖在烟囱防腐中的应用 总被引:1,自引:0,他引:1
火电厂燃煤烟气中存在一定量的SO3,会显著降低烟气的酸露点。由于湿法脱硫后烟温低于酸露点,烟气中的SO3与水蒸汽形成的硫酸蒸汽会凝结下来,造成混凝土烟囱的低温腐蚀。以2×135MW机组烟气脱硫技改工程湿烟囱防腐为例,详细介绍了烟囱内衬泡沫玻璃砖防腐的施工工序、技术要求及注意事项。 相似文献
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K.B McGrattan 《Spill Science & Technology Bulletin》2003,8(4):367-372
A combination of numerical modeling and large-scale experimentation has yielded a tremendous amount of information about the structure, trajectory and composition of smoke plumes from large crude oil fires. A numerical model, a large outdoor fire plume trajectory (ALOFT), has been developed at NIST to predict the downwind concentration of smoke and other combustion products. The model is based on the fundamental conservation equations that govern the introduction of hot gases and particulate matter from a large fire into the atmosphere. The model has been used to estimate distances from fires under of variety of meteorological and topographic conditions where ground level concentrations of smoke and combustion products fall below regulatory threshold levels. 相似文献
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采用蒽醌-2-磺酸钠有机体系光引发自由基降解废水中的染料。分析了蒽醌-2-磺酸钠有机体系光引发自由基降解的机理,考察了曝气、光照强度和初始染料质量浓度等因素对降解效果的影响。实验结果表明:曝气有利于蒽醌-2-磺酸钠有机体系光引发自由基降解染料;在光照强度1 000 W、初始染料质量浓度50 mg/L的条件下,反应60 min后酸性蓝80溶液的脱色率可达100%;在酸性红249、酸性黄42、酸性蓝80、活性艳红KD-8B、活性黄K-6G和活性翠蓝K-NG 6种商用酸性和活性染料中,蒽醌-2-磺酸钠有机体系对活性黄K-6G和活性艳红KD-8B的脱色率最高,对酸性蓝80和活性翠蓝K-NG的脱色率最低。 相似文献
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华北地区某电厂排烟冷却塔烟气抬升高度的光学照相法实测结果显示,选用S/P模式计算出排烟冷却塔烟气括升高度是合理的。在环境风速小、空气潮湿条件下,采用排烟冷却塔排放方式有利于污染物稀释扩散;在环境风速大、空气干燥、逆温等不利气象条件时,采用排烟冷却塔排放方式,烟气抬升高度较低。 相似文献
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Jacob G. Mønster Jerker Samuelsson Peter Kjeldsen Chris W. Rella Charlotte Scheutz 《Waste management (New York, N.Y.)》2014,34(8):1416-1428
Using a dual species methane/acetylene instrument based on cavity ring down spectroscopy (CRDS), the dynamic plume tracer dispersion method for quantifying the emission rate of methane was successfully tested in four measurement campaigns: (1) controlled methane and trace gas release with different trace gas configurations, (2) landfill with unknown emission source locations, (3) landfill with closely located emission sources, and (4) comparing with an Fourier transform infrared spectroscopy (FTIR) instrument using multiple trace gasses for source separation. The new real-time, high precision instrument can measure methane plumes more than 1.2 km away from small sources (about 5 kg h?1) in urban areas with a measurement frequency allowing plume crossing at normal driving speed. The method can be used for quantification of total methane emissions from diffuse area sources down to 1 kg per hour and can be used to quantify individual sources with the right choice of wind direction and road distance. The placement of the trace gas is important for obtaining correct quantification and uncertainty of up to 36% can be incurred when the trace gas is not co-located with the methane source. Measurements made at greater distances are less sensitive to errors in trace gas placement and model calculations showed an uncertainty of less than 5% in both urban and open-country for placing the trace gas 100 m from the source, when measurements were done more than 3 km away. Using the ratio of the integrated plume concentrations of tracer gas and methane gives the most reliable results for measurements at various distances to the source, compared to the ratio of the highest concentration in the plume, the direct concentration ratio and using a Gaussian plume model. Under suitable weather and road conditions, the CRDS system can quantify the emission from different sources located close to each other using only one kind of trace gas due to the high time resolution, while the FTIR system can measure multiple trace gasses but with a lower time resolution. 相似文献
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