共查询到20条相似文献,搜索用时 93 毫秒
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《青海环境》2001,11(4)
什么是天然气 ?天然气是从地下天然气矿床或石油天然气矿井中直接开采出来的可燃气体 ,是以碳氢化合物为主的气体混合物。天然气无毒、无粉尘 ,方便易燃。天然气一般分为 4种 :( 1 )从气井开采出来的气田气 ;( 2 )伴随石油一起开采出来的石油气 ;( 3)含石油轻质馏分的凝析气田气 ;( 4 )煤矿下煤层中抽出的矿井气。涩宁兰使用的涩北天然气属纯天然气 ,燃烧热值高 ,基本不含硫化物和水。天然气组成成份有甲烷、乙烷、丙烷、异丁烷、正丁烷 ,并含有少量的重碳氮化合物以及氮、氦、二氧化硫等。其中甲烷含 99 48% (摩尔百分比 ) ,乙烷含 0 0 8%… 相似文献
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目前,联氨和水合联氨广泛使用于化学工业的各个领域中,其中包括化学纤维、化学聚合物、发泡剂和防腐涂料等物质的生产过程,因此,防止上述物质,特别是污水污染环境,具有重要的意义。联氨在生活用水中的最大允许浓度为0.01Mg/L,水合联氨在渔业用水中的最大允许浓度是0.00025Mg/L。对于含联氨和水合联氨污水净化的常用方法,一个是分解法,另一个是氧化法。分解法中,只有在加入非均相催化剂后,这些物质才有可能自发分解。物质的分解速度随着物质的 相似文献
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天然气中的硫化氢(H_2S)是硫的重要资源,许多国家都很重视从含硫天然气中回收硫。我国天然气中普遍含 H_2S,而 H_2S 为剧毒气体,对人体有害,对设备有强烈的腐蚀作用,易堵塞采油气管柱和气层,故开采含硫天然气有别于一般的天然气,在钻井、采气、集输、净化和加工方面均有其特殊性。随着天然气工业的高速发展,含硫气藏愈来愈多,因此研究天然气中硫资源的特点及其开发技术具有现实意义。 相似文献
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世界各国都在为了防止公害,保护水源,积极探索经济有效地从含各种有毒金属的矿山、冶金工业和化工工业等废水中脱除和回收金属的方法。浮选法是其中的一种方法,近10年来,逐步受到广泛的重视。虽然目前国内研究和报道还极少,但日本、美国、苏联、德国以及西班牙等国都有所研究,其中尤以日本研究较多,取得了较好效果,有的已用于生产。如用黄药浮选法处理含镉废水,自1971年以来已在日本宫古工厂生产中应用,日处理含镉废水2,000米~3,据称效果满意。我国不少地 相似文献
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我国氦资源及其开发与保护 总被引:2,自引:0,他引:2
氦是具有多种“特异功能”的稀有惰性气体,是仅次于氢的最轻元素,分子量为4.0026、比重为0.138(相当于空气的1/7),是飞船或气球的最佳填充剂;氦分子半径小(2.56×10~(-10)m)、粘度低(液态氦在温度-270℃时的粘度为标准状态水粘度的1/10亿)、易扩散,可用于分析仪器(气相色谱)及检漏;氦是难溶于水的气体(在标准状况下氦在水中的溶解度为 相似文献
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Zhiming Cai Richard H. Clarke Bartek A. Glowacki William J. Nuttall Nick Ward 《Resources Policy》2010
Recent, pre-downturn, disturbance in the global helium market can be traced to the tight supply–demand position, which characterizes today’s changing helium supply structure. A detailed System Dynamics model provides fresh insight into the helium question and suggests a production path that is closely associated with future natural gas production. Venting of un-extracted helium to the atmosphere remains a central issue. The model indicates that improving resource exploitation strategies might extend a production plateau that emerges in the 2030s. Substitution will result in more helium being vented. To mitigate this, the industry needs to ensure security of supply (particularly after the Bureau of Land Management reserve is sold). 相似文献
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Effect of the effective stress coefficient and sorption-induced strain on the evolution of coal permeability: Experimental observations 总被引:2,自引:0,他引:2
Zhongwei Chen Zhejun Pan Jishan Liu Luke D. Connell Derek Elsworth 《International Journal of Greenhouse Gas Control》2011,5(5):1284-1293
Permeability is one of the most important parameters for CO2 injection in coal to enhance coalbed methane recovery. Laboratory characterization of coal permeability provides useful information for in situ permeability behavior of coal seams when adsorbing gases such as CO2 are injected. In this study, a series of experiments have been conducted for coal samples using both non-adsorbing and adsorbing gases at various confining stresses and pore pressures. Our observations have showed that even under controlled stress conditions, coal permeability decreases with respect to pore pressure during the injection of adsorbing gases. In order to find out the causes of permeability decrease for adsorbing gases, a non-adsorbing gas (helium) is used to determine the effective stress coefficient. In these experiments using helium, the impact of gas sorption can be neglected and any permeability reduction is considered as due to the variation in the effective stress, which is controlled by the effective stress coefficient. The results show that the effective stress coefficient is pore pressure dependent and less than unity for the coal samples studied. The permeability reduction from helium experiments is then used to calibrate the subsequent flow-through experiments using adsorbing gases, CH4 and CO2. Through this calibration, the sole effect of sorption-induced strain on permeability change is obtained for these adsorbing gas flow-through experiments. In this paper, experimental results and analyses are reported including how the impact of effective stress coefficient is separated from that of the sorption-induced strain on the evolution of coal permeability. 相似文献
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A. N. Macgregor D. R. Keeney 《Journal of the American Water Resources Association》1973,9(6):1153-1158
ABSTRACT: Renewed (de novo) synthesis of methane gas was shown to occur when samples of lake sediment were dispersed on glass beads and incubated in a helium atmosphere at 23°C. Under the above conditions, sediment samples from hardwater and softwater lakes generated up to 440 nanomoles and 80 nanomoles per ml of sediment per two days, respectively. At the time of collection, sediment samples possessed approximately similar amounts of “native” methane. Nitrate, sulfate, and acetylene were shown to suppress methane synthesis by sediment incubated as described. 相似文献
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氦气作载气,选用DB—WAX毛细管色谱柱,优化柱温、柱流量、进样口温度和检测器温度等色谱参数,实现7种苯系物的快速分析。实验结果表明,通过优化色谱条件,7种苯系物在5.3m in内得到了良好的分离,标准样品的测定均值最大相对误差-1.0%,最大相对标准偏差2.5%。 相似文献
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Can Cinar Duygu Ipci Emre Yılmaz Fatih Aksoy 《International Journal of Green Energy》2020,17(13):884-893
ABSTRACT Stirling engines maintain attraction because of their high energy conversion efficiencies. In this study, experimental comparison of a beta-type Stirling engine for two different rhombic-drive mechanisms was presented. In one of the rhombic mechanisms, spur gears were used and the gear shaft was supported in bearings from one side. In the other mechanism, two helical gears were placed on crankshafts and the crankshafts were supported in bearings from both sides. Rhombus lengths of the mechanisms were determined as 66 mm and 80 mm to provide same constant compression ratio of 2.5 for both configurations. Both mechanisms were used in the same beta-type Stirling engine having same cylinder, piston and displacer dimensions. Performance parameters of the engines were evaluated at different helium charge pressures (2–4 bar) and hot-end temperatures (400–600°C). The hot-end of the displacer cylinder was heated by a liquefied petroleum gas (LPG) burner. The engine power increased by 132%, friction losses and gear noses were reduced by supporting the rhombic-drive mechanism from both side and using helical gears. The maximum output torque and power of the engine were obtained as 13.14 Nm at 428 rpm engine speed and 663 W at 800 rpm engine speed, respectively, at 600°C hot-end temperature and 4 bar charge pressure. 相似文献
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Ali Erturk Melike Gurel Alpaslan Ekdal Cigdem Tavsan Aysegul Ugurluoglu Dursun Zafer Seker Aysegul Tanik Izzet Ozturk 《Journal of environmental management》2010,91(7):1526-1545
Istanbul, being one of the highly populated metropolitan areas of the world, has been facing water scarcity since the past decade. Water transfer from Melen Watershed was considered as the most feasible option to supply water to Istanbul due to its high water potential and relatively less degraded water quality. This study consists of two parts. In the first part, water quality data covering 26 parameters from 5 monitoring stations were analyzed and assessed due to the requirements of the “Quality Required of Surface Water Intended for the Abstraction of Drinking Water” regulation. In the second part, a one-dimensional stream water quality model with simple water quality kinetics was developed. It formed a basic design for more advanced water quality models for the watershed. The reason for assessing the water quality data and developing a model was to provide information for decision making on preliminary actions to prevent any further deterioration of existing water quality. According to the water quality assessment at the water abstraction point, Melen River has relatively poor water quality with regard to NH4+, BOD5, faecal streptococcus, manganese and phenol parameters, and is unsuitable for drinking water abstraction in terms of COD, PO43?, total coliform, total suspended solids, mercury and total chromium parameters. The results derived from the model were found to be consistent with the water quality assessment. It also showed that relatively high inorganic nitrogen and phosphorus concentrations along the streams are related to diffuse nutrient loads that should be managed together with municipal and industrial wastewaters. 相似文献
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国外石油天然气开采行业清洁生产技术发展动态 总被引:1,自引:5,他引:1
对比和分析了各国或国际组织关于清洁生产含义的不同解释方法,阐述了石油天然气开采行业清洁生产的基本概念。在此基础上,按照物探、钻井、井下作业(包括试油、酸化及酸压、压裂、修井)、采油及采气生产几个工艺环节,对国际上石油天然气开采行业清洁生产最新技术进行了详细总结和分析。针对我国相关行业的清洁生产水平,提出了实用有效的技术发展对策和建议。 相似文献
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In order to evaluate the potential harmful effects of gas flaring on mammals, albino mice, Mus musculus, were exposed to gas flares for 8 weeks under laboratory conditions. The effect of gas flaring on blood parameters includes
a reduction in white blood cell counts among mice exposed to 8-h daily of gas flaring when compared to control mice. The red
blood cells also showed varied abnormalities such as stacked erythrocytes (rouleaux formation), crenated (spicule) cells and
teardrop cells (dacrocytes). The detection of the increasing level of eosinophils in the blood of mice exposed to gas flares
was observed to be indicative of a degenerative disease condition and usefulness as a good marker of pollution for monitoring,
and early detection of adverse effects of gas flares was recommended. Histopathological examination of the lungs of exposed
mice revealed distortions in the segmental bronchus and alveoli of the respiratory organ, with interspersed brown pigments
and polymorphonuclear cells, which were absent in the controls. The environmental implications including the health hazards
posed by the exposure of mammals to gas flares in crude oil production areas were discussed. 相似文献