共查询到19条相似文献,搜索用时 250 毫秒
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用碘量法测定污染源废气中二氧化硫时,用去离子水代替二氧化硫吸收液,并加入淀粉指示剂和碘标准溶液,采样过程中二氧化硫使紫色的吸收液退色,完全退色后,停止采样,记录采样体积,并根据加入的碘标准溶液量计算出废气中二氧化硫浓度。此方法操作方便、易于掌握,准确度能满足污染源监测的要求,通过比对实验,结果表明本方法是可行的。 相似文献
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甲醛吸收-副玫瑰苯胺分光光度法是测定环境空气中的二氧化硫的常用方法,该方法具有灵敏度高、选择性好等优点,但在实验分析过程中发现,该方法对实验室环境条件、反应条件、试剂的质量和实际操作要求严格。文章通过对影响空白值及检测结果的显色温度、显色时间、实验试剂、样品的采集及保存等关键因素进行实验分析,使校准曲线斜率和试剂空白吸光度值在给定的检测条件下满足检测方法标准的要求,为提高甲醛法测定空气中二氧化硫测量结果的准确性提供参考。 相似文献
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本文探讨了大气中二氧化硫监测方法,采用甲醛法和四氯汞钾法对乐山城区大气中二氧化硫进行对照分析。从采样、样品保存和分析方面等几个方面进行了探讨,并指出了甲醛法的特点、适用范围和存在的问题。 相似文献
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今年1月,国务院下发了《关于酸雨控制区和二氧化硫污染控制区有关问题的批复),该批复原则上同意国家环保总局的(酸雨控制区和二氧化硫污染控制区(以下简称“两控区”)划分范围),要求“两控区”到2000年,排放二氧化硫的工业污染源达标排放,并实行二氧化硫排放总量控制,有关直辖市、省会城市、经济特区城市、沿海开放城市及重点旅游城市空气二氧化硫浓度达到国家环境质量标准,酸雨控制区酸雨恶化的趋势得到缓解。到2010年,二氧化硫排放总量控制在2000年排放水平以内,城市空气二氧化硫浓度达到国家环境质量标准,酸雨控制区降水… 相似文献
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简要分析了四川页岩气勘探钻井现状,监测了单、双平台钻井作业和压裂作业边界噪声。监测结果表明:压裂作业边界昼间噪声平均值高于单、双平台钻井作业平均值约10 dB(A),噪声测量值的最低值和最高值相应高出4~6 dB(A),昼间噪声超标率高于钻井作业,说明压裂作业噪声对周边的影响远超过钻井作业;相对于单平台,双平台发声设备多,造成声叠加影响严重,高发声设备在同一方位声叠加更显著。通过噪声值对比,提出页岩气勘探钻井过程可考虑选取噪声更小的气代油或电代油动力设备、建立隔音设备、根据地形与噪声传播规律调整声源设备摆放位置等降噪措施。 相似文献
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During sequestration, carbon dioxide within injection wells is likely to be in a dense state and therefore its weight within the wellbore will play an important role in determining the bottomhole pressure and thus the injection rate. However, the density could vary significantly along the well in response to the variation in pressure and temperature. A numerical procedure is formulated in this paper to evaluate the flow of carbon dioxide and its mixtures in non-isothermal wells. This procedure solves the coupled heat, mass and momentum equations with the various fluid and thermodynamic properties, including the saturation pressure, of the gas mixture calculated using a real gas equation of state. This treatment is particularly useful when dealing with gas mixtures where experimental data on mixture properties are not available and these must be predicted. To test the developed procedure two wellbore flow problems from the literature, involving geothermal gradients and wellbore phase transitions are considered; production of 97% carbon dioxide and injection of superheated steam. While these are not typical carbon dioxide injection problems they provide field observations of wellbore flow processes which encompass the mechanisms of interest for carbon dioxide injection, such as phase transition, temperature and density variations with depth. These two examples show that the developed procedure can offer accurate predictions. In a third application the role of wellbore hydraulics during a hypothetical carbon dioxide injection application is considered. The results obtained illustrate the potential complexity of carbon dioxide wellbore hydraulics for sequestration applications and the significant role it can play in determining the well bottomhole pressure and thus injection rate. 相似文献
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分析了锅炉燃烧排出的危害人类健康的污染物烟尘及SO2超标的成因,以及长庆油田燃煤锅炉烟道气的监测结果。提出了控制锅炉烟尘排放浓度的对策及消烟措施。例如:推行煤炭洗选,改进燃料结构,限制烟尘超标的锅炉产品制造、安装,改进燃烧方式,强化炉内燃烧,改造除尘器。 相似文献
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Electric power generating plants that use coal were among the key targets of Title IV of the 1990 Clean Air Act. Under the
first phase of the act, 110 coal-fired electric power plants were required to reduce their sulfur dioxide emissions by 1995
and nitrogen oxide emissions by 1996. Phase 2 of the act requires even greater reduction of sulfur dioxide emissions by 2000
and nitrogen oxide emissions by 2008. This study examines whether the 107 targeted plants (three plants went off-line) have
achieved the desired sulfur dioxide and nitrogen oxide emission levels.
The analysis of sulfur dioxide is based on data from 1990, 1995, and 1999. The findings show that although sulfur oxide increased
by 3% from 1995 to 1999, it decreased by 45% over the 1990–1999 period at the firm level for the targeted firms. The findings
also indicate that the overall reduction in sulfur dioxide was achieved by utilizing low sulfur coal and by purchasing emission
allowances. So far as nitrogen oxides are concerned, there has been a reduction of 14% over the 1990–1999 period, of which
7% was achieved during the 1995–1999 period. An evaluation of emissions at the plant level indicates that several plants do
not meet the emissions level for sulfur dioxide or nitrogen oxides.
These results provide a mixed scorecard for reduction in emissions both for sulfur dioxide and nitrogen oxides. Even though
there is reduction in the emissions on an overall basis at the firm level, several plants that have not been able to reduce
emissions deserve special attention to meet the goals of the act in reducing emissions. 相似文献
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气田开发对环境的影响 总被引:3,自引:3,他引:3
气田开采会对地层造成破坏,引起地面下沉甚至诱发地震灾害;钻井液会对土壤、农作物、地下水造成危害;井下作业废液会对周围环境造成污染;气田水会对农作物、水生生物、地下水、人体健康造成危害;含硫的天然气净化过程排出的二氧化硫对树木、人体健康造成危害,并形成酸雨,对环境造成更大的危害。本文以四川气田及国外油气田为实例对上述危害逐一论述,这些对油气田环境保护工作者有一定的借鉴作用。 相似文献
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总量控制是国家节能减排的主要手段,二氧化硫排放量控制是大气污染物削减的主要控制指标。在污染源普查数据统计分析的基础上,对伊宁市废气中二氧化硫排放按污染源和区域进行分担率研究,掌握并了解产生排放二氧化硫按污染源、区域、行业分布情况,确定伊宁市二氧化硫减排的重点行业和区域,为政府调整产业结构及企业合理布局提供决策依据。 相似文献