共查询到19条相似文献,搜索用时 93 毫秒
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阐述了LMC型低压长袋脉冲喷吹除尘器在矿热炉烟气治理中的成功应用。LMC型除尘器在设计上充分考虑到矿热炉高温烟气温度和粉尘性质对设备的影响,并根据不同烟气温度、粉尘性质及工艺的变化,采用不同配件和材料。 相似文献
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选择性催化还原(SCR)是目前控制氮氧化物排放的主要技术。本文介绍了锅炉炉后脱硝系统的布置位置及工艺条件、已经工业化的氨选择性高温还原钒催化剂的特点,以及近年来低温脱硝催化剂的研究现状。指出我国脱硝催化剂应提高还原剂的选择性,开发新型低温催化剂应重点考察烟气中的水、二氧化硫及硫酸氢铵等对催化剂的影响。 相似文献
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以某新建460t/h煤粉炉的SCR脱硝项目为例,基于CFD软件完成几何建模、网格划分、数值计算等模拟工作,分析SCR脱硝系统的速度分布、NH3浓度分布、烟气入射角及压损情况。结果显示:最终的导流板布置方案能达到比较理想的流场分布,脱硝系统满足各项性能指标要求。 相似文献
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新标准下燃煤电厂环保设施改造技术方案分析 总被引:1,自引:0,他引:1
新火电厂大气污染排放标准执行在即,为了保证现役机组稳定达标排放,煤电机组的环保设施需要进行技术改造,满足新标准的综合改造是一个系统工程,涉及电网安全、机组安全、场地条件、资源条件、技术条件、经济条件等因素,改造前应详细论证,综合各方面因素确定。原脱硫、除尘、脱硝设施运行优化调整后仍不能达到标准要求的,则需采进行局部或全面改造。脱硫设施的改造重点应在吸收系统,主要方法有原塔提效、单塔双循环、双塔双循环;除尘设施的改造重点应在提高原电除尘比收尘面积、改为布袋/电袋复合除尘或增设二级烟气净化设施;脱硝设施的改造重点应在优化流场氨氮混合均匀度、提高催化剂反应活性、增加催化剂的耐磨性。 相似文献
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This paper reports findings from research conducted for the Environment Agency1 investigating the social distribution of the risk of flooding in England and Wales. Following a broadly outcome based analysis, and using socio-geographic modelling techniques and the 1991 Census, the social class characteristics of the population at risk from flooding were explored and compared with the population considered not at risk as a means to uncover any evidence of social inequality. The Environment Agency indicative flood plain maps (1 in 100 year return for fluvial and 1 in a 200 year return for tidal flooding) were used to identify at risk areas. Two different methods of capturing the at risk population were employed; one based on census enumeration districts and the other using surface population models which redistribute the area population over a grid surface of the area of interest. The two methods provide completely different results. The enumeration district method indicates that those in higher social classes are the most likely to be exposed to flood hazard while the grid method indicates that it is those in the lower social classes who are most at risk. We suggest that the grid method provides a more accurate analysis but highlight the significant effect that the choice of areal unit and spatial analysis can have on conclusions about the extent of any inequality in vulnerability to flooding. 相似文献
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Biogas production from anaerobic digestion has increased rapidly in the last years, in many parts of the world, mainly due to its local scale disposition and to its potential on greenhouse gases (GHG) emissions mitigation. Biogas can be used as fuel for combined heat and power systems (CHP), in particular for internal combustion engines (ICEs). In recent investigations, fuel cells have been considered as alternative CHP systems. In the present article, two different energy conversion systems are compared: a 1.4 MW class MCFC system, running on pipeline natural gas, and an in situ ICE, running on biogas. In the first case, biogas is considered as a source fuel to obtain upgraded gas to be injected in the natural gas grid. In such scenario, the location of the fuel cell power plant is no longer strictly connected to the anaerobic digester site. Several energy balances are evaluated, considering different upgrading techniques and different biogas methane/carbon dioxide ratios. 相似文献
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介绍了川西北气矿中坝气田须二气藏水质情况,论述了气田水四种处理方法的特点和适用性。为了维持生产和减少环境污染,在该气藏中引入了预处理装置,对气田水进行处理后再进行异层回注。介绍了该工艺的流程,处理后气田水中SS和石油类含量分别为15mg/L和5.3mg/L,达到了设计要求。对处理成本及四种地层水处理方案的经济效益进行了对比,分析了该技术的经济可行性,并根据其应用情况提出了建议,供生产决策部门参考。 相似文献
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The heating and cooling of unit processes (utilities) are often the most significant energy fraction of a gate-to-gate life-cycle inventory (LCI) for individual chemicals. Electricity usage is typically a smaller factor. An LCI of a manufacturing process for a specific chemical has been used to identify the heating and cooling requirements. This paper demonstrates the sub-modules used to convert these utilities into actual energy-related emissions for use in the LCI of a specific chemical. Assumptions and results of the unit operation inventory data and of the potential life-cycle burdens are clearly stated, to foster the objective of transparency. A user may substitute another energy grid, fuel sources, or efficiencies based on some site-specific data. The sub-modules utilize a design basis for calculating the utility emissions. Results may be used in LCI studies in the chemical, biochemical, and pharmaceutical industries. 相似文献