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331.
浅谈锅炉烟尘监测过程中的质量控制 总被引:1,自引:0,他引:1
从采样前准备、现场检查、现场采样等方面出发,结合实际经验,对锅炉烟尘气监测工作谈一些自己的见解。 相似文献
332.
333.
内蒙古天晧水泥有限公司将"挡风抑尘墙"技术成功应用在石灰石预均化堆场和煤场,对消减石灰石预均化堆场和煤场风力,抑制石灰石预均化堆场和煤场扬尘起到了很好的作用,解决了大型堆场扬尘治理的一个技术难题。现就"挡风抑尘墙"的工作机理、结构特点及其抑尘效果等进行分析介绍,以促进该技术的推广和应用。 相似文献
334.
335.
To prevent high density polyethylene (HDPE) dust explosions, this study evaluated HDPE's explosive sensitivity characteristics, and comparatively examined two inert dust types (CaCO3 and NaHCO3) to mitigate the explosive sensitivity of HDPE dust. In the serials of experiments, the 1.2 L Hartmann tube and Godbert-Greenwald furnace were used respectively to measure the minimum ignition energy (MIE) and minimum ignition temperature (MIT) of HDPE dust. The findings demonstrated that the MIE and MIT of HDPE are 56.8 mJ and 320 °C under the most sensitive situation. Second, both CaCO3 and NaHCO3 can inhibit the explosive sensitivity of HDPE with the variation of several parameters (i.e., quality percentage and particle sizes). Specially, as the quality percentage of 38–48 μm NaHCO3 come to 70%, the HDPE/NaHCO3 will not be explosive. Finally, NaHCO3 had a better inerting effect than CaCO3 in the reduction of explosive sensitivity of HDPE. 相似文献
336.
Geographic patterns of non-carpeted floor dust loading in Syracuse, New York (USA) homes 总被引:1,自引:0,他引:1
Johnson DL Hunt A Griffith DA Hager JM Brooks J Stellalevinsohn H Lanciki A Lucci R Prokhorova D Blount SL 《Environmental geochemistry and health》2009,31(3):353-363
Residential floor dust loading was measured on the smooth floor surface of 488 houses in Syracuse, New York, during the summers
of 2003 and 2004. Using U.S. Environmental Protection Agency (EPA) wipe methods, pre-weighed Ghost Wipes, Lead Wipes, or Whatman
Filters were employed to collect duplicate samples from (predominantly) kitchens. The collection efficiency of the various
media was determined from multiple wipe tests and side-by-side comparisons. The results were normalized and aggregated at
the census tract level to determine whether spatial patterns of dust loading could be observed. Loading was found to be log-normally
distributed, with a geometric mean value of 0.311 g m−2 (29 mg of dust per square foot of floor); 95% of the observations fell in the range of 0.042–2.330 g m−2 (4–216 mg foot−2). The sampling for floor dust loading shows some bias for day of the week in which visits to the residential properties were
made. After a first-order correction for this effect, results were aggregated by census tract and mapped in a geographic information
system (GIS); strong spatial patterns can be identified in an inverse distance weighted mapping. The geographic patterns exhibit
a strong correlation with socio-economic/demographic covariates extracted from the 2000 census summaries. Dust mass on the
floors is positively correlated with renter-occupied properties and family size; it is negatively correlated with measures
of household income. 相似文献
337.
Abimbola AF Kehinde-Phillips OO Olatunji AS 《Environmental geochemistry and health》2007,29(2):163-167
The aim of this study was to assess the heavy metal content of the dust generated by the Sagamu cement factory and its attendant
health hazards on the immediate environment, especially on the inhabitants of the area. A total of 25 samples were collected
and analyzed using inductively coupled plasma-optical emission spectrometry. Records of medical ailments associated with heavy
metal toxicity were also compiled from the Obafemi Awolowo Teaching Hospital situated in the town.The results for some of
the selected heavy metals showed the following pattern: limestone: Cd (n.d.-1.7 ppm), Pb (42–48 ppm), Cu (3.0–11 ppm), Zn
(7.0–53 ppm) and Ni (3.0–8.0 ppm); shale: Cd (0.3–1.1 ppm), Pb (17–22 ppm), Cu (2.0–11 ppm), Zn (17–147 ppm) and Ni (3.0–18 ppm);
dusts: Cd (0.5–0.7 ppm), Pb (32–52 ppm), Cu (2–16 ppm), Zn (5–152 ppm) and Ni (2–17 ppm); soils: Cd (0.5–1.1 ppm), Pb (28–49 ppm),
Cu (22–35 ppm), Zn (43–69 ppm) and Ni (13.0–17 ppm). High levels of heavy metals were found in the rocks and soils. We propose
that the high levels of metals in the dust and soil were acquired from the raw materials used by the cement factory and from
active industrial discharge from this same factory. Medical records and the current health situation of the local residents
in the study area reveal that there have been increases in the prevalence of diseases linked to heavy metal toxicity in the
environment, especially those related to dust generation. 相似文献
338.
The standardized KSt parameter still seems to be widely used as a universal criterion for ranking explosion violence to be expected from various dusts in given industrial situations. However, this may not be a generally valid approach. In the case of dust explosion venting, the maximum pressure Pmax generated in a given vented industrial enclosure is not only influenced by inherent dust parameters (dust chemistry including moisture, and sizes and shapes of individual dust particles). Process-related parameters (degree of dust dispersion, cloud turbulence, and dust concentration) also play key roles. This view seems to be confirmed by some results from a series of large scale vented dust explosion experiments in a 500 m3 silo conducted in Norway by CMI, (now GexCon AS) during 1980–1982. Therefore, these results have been brought forward again in the present paper. The original purpose of the 500 m3 silo experiments was to obtain correlations between Pmax in the vented silo and the vent area in the silo top surface, for two different dusts, viz. a wheat grain dust collected in a Norwegian grain import silo facility, and a soya meal used for production of fish farming food. Both dusts were tested in the standard 20-L-sphere in two independent laboratories, and also in the Hartmann bomb in two independent laboratories. Pmax and (dP/dt)max were significantly lower for the soya meal than for the wheat grain dust in all laboratory tests. Because the available amount of wheat grain dust was much larger than the quite limited amount of available soya meal, a complete series of 16 vented silo experiments was first performed with the wheat grain dust, starting with the largest vent area and ending with the smallest one. Then, to avoid unnecessary laborious changes of vent areas, the first experiment with soya dust was performed with the smallest area. The dust cloud in the silo was produced in exactly the same way as with the wheat grain dust. However, contrary to expectations based on the laboratory-scale tests, the soya meal exploded more violently in the large silo than the wheat grain dust, and the silo was blown apart in the very first experiment with this material. The probable reason is that the two dusts responded differently to the dust cloud formation process in the silo on the one hand and in the laboratory-scale apparatuses on the other. This re-confirms that a differentiated philosophy for design of dust explosion vents is indeed needed. Appropriate attention must be paid to the influence of the actual dust cloud generation process on the required vent area. The location and type of the ignition source also play important roles. It may seem that tailored design has to become the future solution for tackling this complex reality, not least for large storage silos. It is the view of the present author that the ongoing development of CFD-based computer codes offers the most promising line of attack. This also applies to design of systems for dust explosion isolation and suppression. 相似文献
339.
分析了青岛输油管道泄漏爆炸事故发生的原因:城市输油管网规划布置不合理;安全监管责任不落实,检查管道状况不到位;泄漏后的应急处置不当,未及时疏散周边群众等。对照美国油气管线的管理体系和历次事故分析经验与整改过程,指出我国油气管线运营管理和安全事故处理方面存在的问题,并提出整改的建议。 相似文献
340.