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以往气污染源有害物质的测定,通常是用采样管从烟道中抽取一定体积的烟气.再通过捕集装置将有害物质捕集下来,然后根据捕集的有害物量和抽取的烟气量,求出烟气中有害物质的浓度,再根据有害物质的浓度和烟气的流量计算其排放量. 相似文献
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烟尘的测定,通常是用采样管从烟道中抽取一定体积的烟气,通过捕集装置捕集尘粒,然后根据捕集的尘粒量和抽取的烟气量,求出烟尘浓度.根据烟尘浓度和烟气的流量计算其排放量.为了从烟道中取得有代表性的烟尘样品,需等速采样,即气体进入采样嘴的速度应与采样点的烟气速度相等.这样,样品浓度才与实际浓度相等.采样速度若大于或小于采样点的烟气速度都将使采样结果产生偏差.烟气压力参数的测定直接影响烟尘测定结果的准确性.根据《空气和废气监测分析方法》,烟尘采样有预测流速法、平行采样法和压力平衡法,三种方法中,常用压力平衡法,此法又分动压平衡法和静压平衡法,动压平衡法是利用装置在采样管上的孔板差压与皮托管指示的测点烟气动压相平衡来实现等速采样.动压平衡法的优点是不需要预先测出烟气流速和烟气状态参数和计算等速采样流量,而是通过调节动压达到平衡即可进行等速采样,不但操作简单,并且能跟踪烟气速度变化而随时保持等速条件,提高等速精度.但是,笔者运用此法测定烟尘多年,发现还有不足和局限性. 相似文献
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本文研究了硅铁电炉布袋除尘收集的烟尘性能,烟尘低温固结球团的性能和工艺方法。研究结果表明,硅铁电炉烟尘中SiO2 约占90 - 95 % ,其它组分含量较低,有利于进行回收利用。烟尘密度小、粒度细、表面活性差、成球性能差。采用添加粘结剂进行自然养护和低温固结处理,均能获得强度较好的固结球团,能够加入铁合金炉回收利用。 相似文献
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介绍了冶金企业高炉冶炼副产品高炉煤气的一种高效回收利用途径,并简要介绍了济钢新建燃气-蒸汽联合循环发电工程工艺流程。阐明了燃气-蒸汽联合循环发电的高效经济性,是钢铁企业回收利用低热值燃料的一种最佳方法。 相似文献
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某钢铁企业高炉炼铁车间的出铁场在生产过程中产生大量高浓度的烟尘,对厂区的大气环境及周边的环境造成严重污染,同时直接危害了职工的身体健康。通过对整个出铁场除尘工艺系统及通风状况的分析及实际应用情况,总结出了适合该场合的系统除尘方案。 相似文献
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DDNP废水处理新方法研究 总被引:1,自引:0,他引:1
DDNP是一种重要的起爆药,其生产废水成份复杂,用传统工艺处理难度较大且不经济。鉴于此,经研究总结得出DDNP废水处理新工艺:先用锅炉废烟气蒸发浓缩,再焚烧的方法,即处理了废水,又降低了锅炉烟尘。是一种低成本、低能耗以废治废的经济实用方法。 相似文献
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钢铁行业铁矿石烧结和电弧炉炼钢是我国二噁英减排优先重点控制的行业之一。本文简要介绍了二噁英的危害性和烧结、电炉炼钢工艺二噁英的产生成因,并从清洁生产技术和污染治理技术两方面探讨二噁英的减排途径。 相似文献
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To date seagrass monitoring has involved the removal of seagrass from its environment. In fragile or highly disturbed systems, monitoring using destructive techniques may interfere with the environment or add to the burden of disturbance. Video photography is a form of non-destructive monitoring that does not require the removal of seagrass or interference with the environment and has the potential to be a valuable tool in monitoring seagrass systems. This study investigated the efficacy of video photography as a tool for detecting change in seagrass cover, using the temperate Australian species Amphibolis antarctica (Labill.) Sonder ex Aschers. Using visual and random point estimates of seagrass cover from video footage, it was possible to determine the minimum sample size (number of random video frames) needed to detect change in seagrass cover, the minimum detectable change in cover and the probability of the monitoring design committing a Type II error. Video footage was examined at three scales: transects (m apart), sites (km apart) and regions (tens of km apart). Using visual and random point estimation techniques, a minimum sample size of ten quadrats per transect was required to detect change in uniform and variable seagrass cover. With ten quadrats it was possible to identify a minimum detectable change in cover of 15% for uniform and 30% for variable seagrass cover. Power analysis was used to determine the probability of committing a Type II error from the data. Region level data had low power, corresponding to a high risk of committing a Type II error. Site and transect level data had high power corresponding to a low risk of committing a Type II error. Based on this study's data, managers using video to monitor for change in seagrass cover are advised to use data from the smaller scale, for example, site and transect level data. By using data from the smaller scale, managers will have a low risk of incorrectly concluding there has not been a disturbance when one has actually occurred. 相似文献
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Ground cover impacts on sediment and phosphorus export from manured riparian pasture 总被引:1,自引:0,他引:1
Butler DM Franklin DH Ranells NN Poore MH Green JT 《Journal of environmental quality》2006,35(6):2178-2185
Maintaining pasture ground cover is important in preventing environmental degradation of grasslands and associated riparian areas. The objective of this work was to determine the effect of ground cover on sediment and P export from pastured riparian areas under simulated rainfall events. Plots were established on two sites in the North Carolina Piedmont: a 10% slope with Appling sandy loam soils (fine, kaolinitic, thermic Typic Kanhapludults) and a 20% slope with Wedowee sandy loam soils (fine, kaolinitic, thermic Typic Kanhapludults), both with mixed tall fescue (Festuca arundinacea Schreb.)-dallisgrass (Paspalum dilatatum Poir.) vegetation. Existing forage stands were modified to represent a range of ground cover levels: 0, 45, 70, and 95% (bare ground, low, medium, and high cover, respectively), and amended with beef steer (Bos taurus) feces and urine (about 10 kg P ha(-1)). Mean runoff volume from bare ground was generally twice that observed from low, medium, and high levels of cover, which were similar. For all rainfall events combined, export of dissolved reactive P was greatest (P < 0.1) at bare ground and was reduced 31% at low cover, which did not differ from medium or high cover. Mean total Kjeldahl P export was greater (P < 0.001) from bare ground than from other cover levels. Results indicate that riparian bare areas can contribute substantial sediment (>215 kg ha(-1)) and P (0.7 kg P ha(-1)) to surface waters during heavy rainfall, whereas export may be reduced equally well by low cover (45%) as by high cover. 相似文献
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本文详细计算分析了攀钢钛业有限责任公司钛冶炼厂一期钛渣电炉炉气系统中存在的问题,针对存在的主要问题提出治理方案措施,经实施后达到了预期目的,为国内最大钛渣电炉稳产达产提供了良好的基础条件。 相似文献
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本文针对320m^2烧结机头电除尘器烟气、烟尘的特点,以及该电除尘器存在的关键问题,着重介绍在改造上采用新的除尘技术和方法,使改造后的电除尘器能够满足机头工艺除尘的要求,达到提效净化烟气达标排放的目的。 相似文献