共查询到20条相似文献,搜索用时 686 毫秒
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天然气中常含有硫化氢、一氧化碳和有机硫等酸性组分,酸性组分的存在会造成金属腐蚀、环境污染并进而危害人体健康等。文章简单介绍了天然气脱硫净化及硫磺回收工艺,重点对天然气生产过程中所产生的硫化氢、甲烷、硫磺、二氧化硫、一氧化碳、氮氧化物、噪声、高温等职业病危害因素进行了识别,分析并介绍了其影响及防护措施。 相似文献
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泄漏检测与修复(LDAR)技术是控制VOCs无组织排放的重要方法,但在天然气行业应用较少。对A天然气净化厂的一列净化装置(原料气过滤分离单元、脱硫脱碳单元、脱水单元)开展动静密封点LDAR工作。通过装置情况调研、密封点台账建立、现场检测、泄漏修复、数据核算分析等将LDAR技术全流程在天然气净化厂进行应用。结果表明:净化装置实现VOCs减排率达80.22%,具有较好的减排效果。现场应用证明LDAR技术是控制天然气行业VOCs无组织排放的有效手段。 相似文献
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An experiment was conducted to determine the influence the time of brush-cutting can have on plant regrowth and attractiveness
to herbivores that browse in linear corridors. The influence of cutting time on leaf flush and senescence, shoot morphometry,
and biomass was measured for 3 consecutive years after initial brush-cutting. Results indicate that morphological and phenological
attributes of three woody deciduous plants were influenced by the timing of brush-cutting for up to 3 years after initial
cutting. Brush-cutting generally stimulated plants to produce larger than normal shoots and delay leaf senescence. The degree
to which plants were affected, however, varied with the timing of initial cutting and the species in question. Generally,
plants cut later in the year resprouted more vigorously and were taller in the third year after cutting but produced less
overall biomass than when cut earlier. In the years following brush-cutting, plants cut earlier flushed leaves earlier in
the spring but delayed leaf senescence in the fall when compared to uncut controls. Results of these trials suggest that brush-cutting
time influences plant response and several plant attributes known to influence plant attractiveness to moose and other herbivores.
We therefore recommend that roadside and railside vegetation management plans consider the influence of cutting time on plant
regrowth. Such considerations can ensure that brush is cut to reduce the attractiveness of plant regrowth in these linear
corridors, reduce the utilization of such brush by herbivores, and, as such, mitigate collision risk between motorists and
herbivores such as moose. 相似文献
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植物种质资源是人类赖以生存的资源,是一个国家和地区重要的基础性战略物质,四川植物种质资源无论是种类还是数量在全国都居重要地位。在分析四川种质资源特点和利用现状的基础上,对积极开展四川种质资源保护利用进行了探索和研究,提出了大力开展植物种质资源及其保存和利用现状的全面调查,摸清家底,逐步建立植物种质资源保护利用数据库和网络信息平台,大力开展多种形式的示范工程建设,积极开展植物种质资源监测网络建设,加强植物种质资源的研究开发,加强植物种质资源管理运行机制建设,搭建种质资源共享平台,加强人才队伍建设等植物资源保护和可持续利用对策及其保障措施。 相似文献
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本文根据我国珍稀濒危植物的保护现状和管理工作中存在的问题,系统地探讨了加强我国珍稀濒危植物和野生植物资源保护的政策措施。文中提出一系列具体、有效的政策构思,以及建立政府有关主管部门对珍稀濒危植物协调管理的体制等。 相似文献
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8种中药提取物对植物病原真菌的抑制活性 总被引:1,自引:0,他引:1
研究目的是改良植物源杀菌剂的筛选思路,降低植物源农药的毒残留,寻找效果较持久的植物源杀菌剂.通过筛选提取常见且具有强抗逆性的植株如柳、盐肤木等植物叶中活性抑菌成分,寻找低毒持效的杀菌剂.从试验数据分析得出,在粗提物质量浓度为50mg/mL时,连翘、盐肤木对3种供试植物病原菌抑制效果显著,抑制率均在65%以上,柳叶、马尾松针、臭椿、茵陈蒿的粗提物对至少两种植物病原菌的菌丝生长速率抑制率在50%以上;香槐和枫杨叶活性较低,仅对其中一种病原菌活性达到50%;柳叶、马尾松针、臭椿叶对两种病原菌气生菌丝的生长状况具有明显的抑制作用;盐肤木粗提物的抑制作用具有较好的延续性,因此连翘、盐肤木作为植物源杀菌剂具有深入研究的价值. 相似文献
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Klemens Marx Johannes Bolhàr-Nordenkampf Tobias Pröll Hermann Hofbauer 《International Journal of Greenhouse Gas Control》2011,5(5):1199-1205
A semi-commercial 10 MWth chemical looping combustion (CLC) plant for power production is proposed as a next scale demonstration plant after successful operation of a 120 kW CLC pilot rig. The design criteria for the CLC boiler are derived from the experience obtained from the CLC pilot rig at Vienna University of Technology. The IPSEpro simulation environment is chosen for implementation of the process flow sheet of the CLC power plant. A single pressure steam cycle is suggested for this small scale demonstration plant. Heat exchangers and a five-stage steam turbine are arranged. Basic design parameters of the power plant are derived from detailed mass and energy investigations and discussed. It turns out that the net electric efficiency of such a small scale plant can be expected to be in the range of 32.5–35.8%. However, a demonstration of CLC at such a scale is necessary in order to gain confidence in more sophisticated CLC power generation concepts at larger scale. 相似文献
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A debate is still open on issues of waste to energy methodologies aiming to answer to questions of particular relevance, such as whether the concept of SRF/RDF production can be applied directly to MSW through the Mechanical–Biological Treatment (MBT) process, when selective collection acts as a virtual pre-treatment of the same, or if the use of SRF/RDF as alternative fuel in cement kilns is the most sustainable solution. In this study, two scenarios were analyzed and compared: (a) the use of SRF in a new dedicated thermal plant for electricity production and (b) the use of SRF as an alternative fuel in an existing cement plant. The comparative assessment was based on principles of Sustainable Waste Management embracing technical and cost issues, environmental protection, industrial ecology and symbiosis. The application of SWOT analysis showed that the use of SRF in cement kilns is more sustainable compared to its use in a new dedicated plant for electricity production. 相似文献
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Smith KE Putnam RA Phaneuf C Lanza GR Dhankher OP Clark JM 《Journal of environmental quality》2008,37(5):1855-1861
Runoff from turf environments, such as golf courses, is of increasing concern due to the associated chemical contamination of lakes, reservoirs, rivers, and ground water. Pesticide runoff due to fungicides, herbicides, and insecticides used to maintain golf courses in acceptable playing condition is a particular concern. One possible approach to mitigate such contamination is through the implementation of effective vegetative filter strips (VFS) on golf courses and other recreational turf environments. The objective of the current study was to screen ten aesthetically acceptable plant species for their ability to remove four commonly-used and degradable pesticides: chlorpyrifos (CP), chlorothalonil (CT), pendimethalin (PE), and propiconazole (PR) from soil in a greenhouse setting, thus providing invaluable information as to the species composition that would be most efficacious for use in VFS surrounding turf environments. Our results revealed that blue flag iris (Iris versicolor) (76% CP, 94% CT, 48% PE, and 33% PR were lost from soil after 3 mo of plant growth), eastern gama grass (Tripsacum dactyloides) (47% CP, 95% CT, 17% PE, and 22% PR were lost from soil after 3 mo of plant growth), and big blue stem (Andropogon gerardii) (52% CP, 91% CT, 19% PE, and 30% PR were lost from soil after 3 mo of plant growth) were excellent candidates for the optimization of VFS as buffer zones abutting turf environments. Blue flag iris was most effective at removing selected pesticides from soil and had the highest aesthetic value of the plants tested. 相似文献