共查询到20条相似文献,搜索用时 46 毫秒
1.
2.
在评价或选择一台除尘器时,除尘效率是一重要参数.因为一台除尘器的除尘效率高低,是代表它的除尘效果,关系到所选用的除尘器能否把要处理的废气中的粉尘除掉,以便使粉尘排放浓度(或粉尘排放量)达到国家排放标准。下面介绍除尘效率的几种表示和计算方法,并用具体例子来说明如 相似文献
3.
为高效收集微细颗粒物,提出一种反向电场静电增强袋式除尘器;并研究了过滤风速对反向电场静电增强袋式除尘器除尘效率的影响;试验对比了反向电场静电增强袋式除尘器、预荷电袋式除尘器、普通袋式除尘器的除尘效果,结果表明,反向电场袋式除尘器的除尘性能明显优于普通袋式除尘器和预荷电袋式除尘器.对于处理PM2.5烟雾,当风速为1.5 m/min时,反向电场静电增强袋式除尘器的除尘效率比普通袋式除尘器高10.0%以上;当风速为2.0 m/min时,反向电场静电增强袋式除尘器的除尘效率比普通袋式除尘器高50.0%以上. 相似文献
4.
5.
6.
除尘效率包括总效率和分级效率。在评价除尘器性能时,用分级效率更加确切。按定义,分级效率η可写为: η=f_c╱f_l×100% (1)式中 f—除尘器收尘粒子的重量百分数分布,也称收尘分布频率f_l—除尘器进口粉尘粒子的重量百分 相似文献
7.
湿式除尘器分级效率的计算和分析 总被引:2,自引:0,他引:2
本文详细推导了湿式除尘器分级效率的计算公式,分析了液气比、气体速度和粉尘粒径对除尘器分级效率的影响。认为在湿式除尘器中,液气比取0.3 ̄0.81/m^3、气体速度取10 ̄30m/s范围内较合理,能达到高效低能的除尘目的,为研制新型湿式除尘器提供一定的理论依据。 相似文献
8.
1 前言 燃煤锅炉配套使用除尘器主要为多管旋风除尘器和静电单管除尘器。多管旋风除尘器存在除尘效率低、磨损快等缺点;静电单管除尘器效率很高,但设备造价偏高,难以推广。因此我们研制了一种除尘效率高,脱硫除尘一体化的高效除尘器——多功能射流除尘器。武汉建筑机械厂有一台卧式炉排2t锅炉,原配装一台XZD/Gφ810型旋风除尘器,处理风量为6500m~3/h,热态阻力774Pa,除尘效率94%,并伴有SO_2烟气排出,选配Y5-47-5C型风机。由于该除尘器长期外排 相似文献
9.
移动电极静电除尘器通过刷除阳极板上收集的粉尘的方式进行清灰.移动电极是指阳极系统做回转运动,阳极板呈带条状,固定在链条上,随链轮转动,能有效克服困扰常规电除尘器的高比电阻粉尘导致的反电晕及振打二次扬尘等难题,大幅提高了除尘效率.对于移动电极静电除尘器来说,如何提高移动极板、旋转刷、链条等运动组件的运行可靠性是关键.由于移动电极静电除尘器对烟气入口浓度有上限要求,因此,改进考虑将前几个电场采用常规固定电极除尘区作为预除尘区,以降低移动电极静电除尘器入口处烟气浓度,提出了常规固定电极除尘区与移动电极除尘区联合使用的除尘器收尘性能公式. 相似文献
10.
11.
OBJECTIVE: This is a study of 8,464 adult women and 21,155 adult males who entered substance abuse treatment in Texas between 2000 and 2005. Participants were either on probation for driving under the influence (DUI), were referred to treatment by DUI probation, or had been arrested for DUI in the past year. METHODS: The female and male clients were compared on demographic characteristics, substance use patterns, DSM-IV diagnoses, and levels of impairment. T tests and chi square tests were used to determine significance and multivariate logistic regression identified predictors of completing treatment and being abstinent at follow-up. RESULTS: The proportion of females who were sent to treatment as a result of DUI increased from 27% in 2000 to 32% in 2005. Females were significantly more likely than males to be White (73% vs. 56%), to have used substances a shorter period of time (17 vs. 19 years), to be seeking custody to regain their children (11% vs. 2%), to meet the DSM criteria for drug dependence (32% vs. 23%), to have injected drugs (31% vs. 23%), to have used substances daily (42% vs. 40%), to have a depressive disorder (16% vs. 7%) or bipolar disorder (12% vs. 5%), and to be have been in treatment before (60% vs. 49%). In contrast, males were more likely to be alcohol dependent (49% vs. 44%). Females were less likely to complete treatment (67% vs. 72%) and reported significantly more days of problems on the 6 domains of the ASI at both admission and at 60-day follow-up. Furthermore, at follow-up, they were more likely to be living with someone who abused alcohol or used drugs (9% vs.7%). CONCLUSIONS: Although females comprised only 29% of the DUI treatment admissions, they were more impaired and experienced more problems than their male counterparts. The findings indicate that additional resources, including treatment for co-occurring mental health problems and living in sober households, may be keys to helping these women achieve abstinence and prevent additional DUI episodes. 相似文献
12.
13.
《Journal of Loss Prevention in the Process Industries》1999,12(1):79-84
In the past, the chemical industry in Japan has been the cause of a number of major industrial accidents. Subsequent to each accident, specific lessons have been learned. These lessons learned have been implemented in terms of safety education of the employees and/or safety measures of the equipment and facilities resulting in a rapid decrease of corresponding accident frequencies. In this paper, we summarized both recent and past major accidents caused by chemical substances in fixed installations in Japan. Case studies show that runaway reactions are among the main causes of major accident occurrences in the chemical process industry in Japan. A recent fatal poisoning accident caused by H2S gas generated during maintenance work again highlights the necessity of adequate safety management in a chemical factory. Therefore, even if hazard evaluation of chemical substances and chemical processes is necessary to prevent runaway reactions, human error is also an important factor contributing to reaction hazards [Wakakura, M. (1997) Human factor in chemical accidents, J. Safety Eng. High Press. Gas. Safety Inst. Japan, 34, 846]. 相似文献
14.
《Journal of Safety Research》1997,28(3):123-131
The aim of this study was to describe violence in Finnish workplaces by comparing it with leisure-time violence. The data were derived from 13,762 interviews made from a representative sample of the Finnish population in 1988. The subjects were asked to report all the violent incidents they had encountered during the previous 12 months. There were 394 victims of violence in workplaces, that is, 40.6 victims per 1,000 workers. The rate of occupational violence was almost identical for males (40.6) and females (40.5). The most hazardous occupations were prison guard, police officer, and mental health nurse. The main reasons for violence at work were related to refusal of an authority's order to go away or to the relationship between doctor or nurse and patient. A typical assailant was an unaccompanied man who was under the influence of alcohol. 相似文献
15.
Rauno Pääkkönen Milja Koponen 《International journal of occupational safety and ergonomics》2018,24(1):160-163
The aim of this work is to evaluate and describe the current status of, and prospects for, the future of occupational hygiene in Finland. The main sources of information include a seminar held in the annual meeting of Finnish Occupational Hygiene Society and interviews with different stakeholders. Nanotechnology and other new materials, changing work environments, circular economy including green jobs, new medical methods and advances of construction methods were recognized as future challenges. Future work opportunities for occupational hygiene experts included exposure assessments in indoor air surveys, private consulting and entrepreneurship in general, international activities and product safety issues. Unclear topics needing more attention in the future were thought to be in new exposures, sensitive persons, combined effects, skin exposures and applicability of personal protective equipment. Occupational hygiene should broaden its view; occupational hygienists should have to cooperate with other specialists and grasp new challenges. 相似文献
16.
17.
WTO与中国安全生产 总被引:4,自引:0,他引:4
新世纪之始,中国将要迈进世界贸易组织(WTO)。在入世的过程中,与美国为首的发达国家之间始终存在着阻挠与反阻挠、限制与反限制的斗争,目前虽已告一段落,但远未结束。可以预见,中国加入WTO之后,斗争非但不会停止,甚至可能会更复杂、更激烈。这场经济、贸易斗争实际上还有着深刻的政治与社会背景。最近几年,发达国家一直在努力使社会条款纳入世界经济贸易体系之中,在“关注发展中国家人权状况”的旗号下,反复提出“劳工标准”问题,即把本国安全生产问题与国际贸易挂钧。实际上这是“涂上绿色’”的贸易保护主义。中国是一… 相似文献
18.
19.
2008年,是中国的奥运之年,也是中国林科院建院50周年、哈尔滨林机所建所50周年、<林业劳动安全>杂志创刊20周年. <林业劳动安全>的诞生,为林业安全文化建设开辟了一片广袤的园地,为加强学术交流打开了一洞明亮的牕牖,为行业安全的发展提供了一块方正的铺路石…… 相似文献
20.