3200m^3以上大型高炉煤气干法袋式除尘技术及设备

由江苏瑞帆环保装备股份有限公司开发的3200m^3以上大型高炉煤气干法袋式除尘技术及设备,适用于冶金行业炼铁高炉煤气除尘.主要技术内容-、基本原理高炉煤气经重力除尘后,由荒煤气主管分配到袋除尘器各箱体中,并进入荒煤气室,颗粒较大的粉尘由于重力作用自然沉降进入灰斗,颗粒较小的粉尘随煤气上升.     

高炉煤气干法除尘技术的发展

我国是采用高炉煤气干法袋式除尘最早的国家之一,至今已有40多年的历史。本文介绍了高炉煤气干法除尘技术发展的三个阶段,即起步、发展,以及炉容1000m3以上级的提高阶段,认为采用干法除尘,才能节能减排,实现综合利用。     

我国炼铁除尘技术存在的问题和改进措施

目前，我国有各种高炉3200余座，其中，2000m3以上高炉43座，500m3以上73座，约占总生产能力的50％。炼铁生产中的粉尘产生于高炉原料系统、出铁场、煤气系统及喷煤制粉输粉系统。冶炼一吨铁水可产生9～12kg烟尘。炼铁生产产生的粉尘具有点多量大面广的特点，且其无组织排放尘源，移动尘源，易燃易爆尘源，高浓度尘源的除尘皆具有较大的技术难度。以下就炼铁生产除尘技术存在的问题和取得的进展分述如下：一、高炉煤气干法净化高炉煤气由含尘量40～100g／m3降至使用要求的5—6mg／m3，要经过一系列的除尘净化过程，其传统工艺为湿法除尘。湿…     

电除尘器在唐钢2560m^3高炉出铁场除尘中的应用

根据出铁场烟尘特性,探索大型高炉出铁场除尘方式中更为有效、可靠的方法,推动我国大型高炉出铁场除尘技术的发展,结合唐钢2560m^3高炉出铁场实际,阐述了唐钢2560m^3高炉出铁场除尘器成功经验,可供类似工程设计参考。     

炼铁厂高炉煤气袋式除尘新材料：美塔斯METAMAX^TM高温过滤袋

一、概述美塔斯METAMAXTM（原名NOMEX，TEIJINCONE）是杜邦帝人先进纤维（香港）有限公司的注册商标。高温过滤袋用于高炉煤气净化是近十多年的事，它净化效果好，有很好的社会效益和经济效益，因而发展迅速。目前，这一除尘技术已引起了冶金界的注意。高炉煤气是炼铁生产的主要副产品，发生量大，是冶金联合企业的主要能源。出炉的煤气含有大量粉尘，必须净化后才能使用。传统的煤气净化方法是通过重力除尘器、洗涤塔、文匠里管完成粗、中、细除尘，使净煤气含尘量小于10mg／m3，用于热风炉、焦炉、轧钢加热炉、锅炉房、电厂等地…     

高炉煤气用布袋及环缝除尘技术的综合比较

分析了高炉煤气采用干式布袋与湿式环缝两种技术的优缺点,并从环保、能耗、运行的经济性方面进行了对比。提出在新技术、新管理意识下,两种除尘方式的环保效果、能耗水平均相当,只是干式布袋除尘技术在经济性方面有突出的优势,在国内仍会作为主流技术推广。     

复瑞康静电除尘除焦油技术

由神木县复瑞康环保设备有限公司开发的复瑞康静电除尘除焦油技术,适用于煤焦化行业。主要技术内容一、基本原理焦化炉排放的气体通过管道进入电捕焦油器,煤气进口处设有多级气体分布器,可用机械方法除去部分焦油、降低煤气流速和使煤气分布更加均匀,使电捕焦油     

上吸式高炉出铁口烟气捕集除尘系统

由无锡市东方环境工程设计研究所有限公司和无锡市东方工业环保有限公司开发、江苏省环境保护产业协会推荐的上吸式高炉出铁口烟气捕集除尘系统适用于高炉出铁场(出铁口、出渣口、铁水罐)、高炉上料、高炉槽上槽下等系统除尘。主要技术内容一、基本原理烟气热抬升和风速的差速分配原理。二、技术关键1.捕集装置充分利用烟气的热抬升力诱导捕集、符合流体动力学降低捕集罩的结构阻力,确保烟尘的捕集率;2.优化管网设计、控制管道内烟尘流速,确保管网系统阻力的合理性和风量分配的平衡;3.采用低阻抗结露脉冲离线清灰除尘器专利技术,保证了较低…     

高炉煤气干法布袋除尘器——河北高科环保有限公司

河北高科环保有限公司（原泊头市新科环保有限公司），始建于1974年，是集设计、开发、制作、安装于一体的专业除尘器厂家。目前是河北省十强、中国环保产业协会骨干企业。从2001年至今公司承揽了高炉炼铁高炉煤气干法脉冲除尘系统设备的设计、制作、安装、调试交钥匙工程140余套；高炉有380m3、450m3、     

上吸式高炉出铁口烟气捕集除尘器

由无锡市东方环境工程设计研究所有限公司,无锡市东方工业环保有限公司联合开发的上吸式高炉出铁口烟气捕集除尘器,适用于高炉出铁场(出铁口、出渣口,铁水罐)、高炉上料系统、高炉槽上槽下系统等的除尘.     

Postfire Regeneration in <Emphasis Type="Italic">Pinus pinea</Emphasis> L. and <Emphasis Type="Italic">Pinus pinaster</Emphasis> Aiton in Andalucia (Spain)

The objective of this study was to examine postfire regeneration of tree, shrub, and dwarf shrub species, in relation to levels of damage in four planted pine forests (Pinus pinea, Pinus pinaster) in Andalusia. A prefire vegetation map was used for detailing species composition, vertical structure, and density and another for detailing the extent and intensity of fire damage. Between 3 and 7 years after the fires, an inventory was made of the vegetation in each area, using the step-point method. The information thus obtained was used to determine the amount of cover in the dwarf/shrub and tree layers, the frequency of species in each of the layers, floristic richness, and diversity (Shannon index). The botanical composition of the dwarf and shrub layer was analyzed using TWINSPAN. Variables were poorly correlated with level of fire damage, which suggests that the forests in this study followed the autosuccession model. Because of the artificial origin or seminatural condition, regeneration of the dominant tree species is poor, and it seems unlikely that forests will recover to their prefire state. Therefore action is recommended to restore these ecosystems.     

Phytoremediation of heavy metals by <Emphasis Type="Italic">Eichhornia crassipes</Emphasis>

Eichhornia crassipes was tested for its ability to bioconcentrate 8 toxic metals (Ag, Cd, Cr, Cu, Hg, Ni, Pb, and Zn) commonly found in wastewater from industries. Young plants of equal size were grown hydroponically and amended with 0, 0.1, 0.3, 0.5, 1.0, 3.0, and 5.0 mM of each heavy metal individually for 21 days. The test plant had the lowest and the highest tolerance indices for Hg and Zn, respectively. A significant (P ≤ .05) reduction in biomass production was observed in metal treated plants compared with the control. All strace elements accumulated to higher concentrations in roots than in shoots. Trace element concentrations in tissues and the bioconcentration factors (BCF) were proportional to the initial concentration of individual metal in the growth medium and the duration of exposure. From a phytoremediation perspective, E. crassipes is a promising plant species for remediation of natural water bodies and/or wastewater polluted with low levels of Zn, Cr, Cu, Cd, Pb, Ag and Ni.     

Allelopathic response of <Emphasis Type="Italic">Vetiveria zizanioides</Emphasis> (L.) Nash on members of the family Enterobacteriaceae and <Emphasis Type="Italic">Pseudomonas</Emphasis> spp.

The biological removal of phosphates was carried as a part of treatment strategy. Vetiveria zizanioides (L.) Nash belonging to the family Poaceae was used for biological removal of biostimulants. Vetiver reportedly has mycorrhizal association; besides having potential for removal of PO₄ ⁻³ also showed allelopathic affect on the microorganisms present in the water. In fact after a period of 96 h old roots of this plant have been found to have killing effects on the E. coli, Enterobacter spp. Pseudomonas spp. belonging to the family Enterobacteriaceae. The paper is opening a new face of study.     

Alteration in Rhizosphere Soil Properties of Afforested <Emphasis Type="Italic">Rhamnus lycioides</Emphasis> Seedlings in Short-Term Response to Mycorrhizal Inoculation with <Emphasis Type="Italic">Glomus intraradices</Emphasis> and Organic Amendment

The reestablisment of autochthonous plant species is an essential strategy for recovering degraded areas under semiarid conditions. A field experiment was carried out to assess the short-term effect of two reafforestation methods involving mycorrhizal inoculation and compost addition on soil quality parameters and Rhamnus lycioides seedling growth. The nutrient content (NPK) and enzymatic activities (dehydrogenase, urease, protease-BAA, acid phosphatase and β-glucosidase) increased and bulk density decreased in the rhizosphere soil with the organic amendment. Biomass C of rhizosphere soil increased by at least 240% with respect to the control soil after mycorrhizal inoculation and the combination of compost addition + mycorrhizal inoculation. Both mycorrhizal inoculation and composted organic residue addition increased R. lycioides seedling growth in the same proportion. In the short term, we conclude that the application of both reafforestation methods not only enhances the establishment of R. lycioides seedlings, but also improves soil quality.     

Introduced Species and Management of a <Emphasis Type="Italic">Nothofagus/Austrocedrus</Emphasis> Forest

Isla Victoria (Nahuel Huapi National Park, Argentina), a large island dominated by native Nothofagus and Austrocedrus forest, has old plantations of many introduced tree species, some of which are famed invaders of native ecosystems elsewhere. There are also large populations of introduced deer and shrubs that may interact in a complex way with the introduced trees, as well as a recently arrived population of wild boar. Long-standing concern that the introduced trees will invade and transform native forest may be unwarranted, as there is little evidence of progressive invasion, even close to the plantations, despite over 50 years of opportunity. Introduced and native shrubs allow scattered introduced trees to achieve substantial size in abandoned pastures, but in almost all areas neither the trees nor the shrubs appear to be spreading beyond these sites. These shrub communities may be stable rather than successional, but the technology for restoring them to native forest is uncertain and probably currently impractical. Any attempt to remove the exotic tree seedlings and saplings from native forest would probably create the very conditions that would favor colonization by exotic plants rather than native trees, while simply clear-cutting the plantations would be unlikely to lead to regeneration of Nothofagus or Austrocedrus. The key to maintaining native forest is preventing catastrophic fire, as several introduced trees and shrubs would be favored over native dominant trees in recolonization. Deer undoubtedly interact with both native and introduced trees and shrubs, but their net effect on native forest is not yet clear, and specific management of deer beyond the current hunting by staff is unwarranted, at least if preventing tree invasion is the goal. The steep terrain and shallow soil make the recently arrived boar a grave threat to the native forest. Eradication is probably feasible and should be attempted quickly.     

Norton’s <Emphasis Type="Italic">Sustainability</Emphasis>: Some Comments on Risk and Sustainability

Bryan Norton’s 2005 book Sustainability describes a pragmatic approach to environmental philosophy that stresses philosophy’s role as one of mediating between scientific and ordinary language. But on two topics, Norton’s approach is not pragmatic enough. In the case of his discussion of risk, he accedes to a scientific notion that fails to acknowledge the way that ordinary usage of the word risk involves pragmatic links to human action and moral responsibility. With respect to the word sustainability, his analysis fails to acknowledge important scientific work that characterizes the functional integrity of system cycling, opting instead for usage grounded either in economic accounting or in an even less substantive sense of a broad social movement for environmental improvement. On each of these topics, adherence to the pragmatic orientation of Norton’s philosophy results in a different analysis of the concepts in question.     

“Guardianship” and the “Rural Workshop”—The First Quarter-century of U.K. Experience in Nature Conservation

In the U.K., the Countryside Act of 1968 represented the first “updating” of the pioneering National Parks and Access to the Countryside Act of 1949. Through the archival material that survives for the Ministry of Agriculture and Nature Conservancy, the paper commemorates that first quarter-century of post-war adjustment to the needs of farming and wildlife conservation. It does so through a case study of the documented discussion, both inter-agency and within separate counsels, of whether agricultural improvement grants should be paid for land scheduled as Sites of Special Scientific Interest (SSSIs). The post-war assumptions of both parties were shattered by clashes over the SSSIs of Cavenham Heath (Suffolk) and Waddingham Common (Lincolnshire). Characterized as a “cold” war, there was a point beyond which antipathy served no one's interests. Fully aware of the options available to policy-makers, both parties recognized the Countryside Bill as an opportunity to obtain greater protection for SSSIs without prejudicing the larger notions of guardianship of the rural resource and the importance that continued to be given to the countryside as the farmer's “workshop”.