红土镍矿回转窑烟气石灰石膏法脱硫系统设计概况

目前,国内冶炼红土镍矿普遍采用回转窑～矿热炉～转炉工艺,回转窑运行过程中排放的烟气含有大量的二氧化硫气体。本文论述了回转窑烟气石灰石膏法脱硫工艺的基本原理、工艺设计、参数设计、设备选型及运行结果等方面内容。经过三年多的实际运行,脱硫系统稳定运行,脱硫效率大于设计值,可知石灰石膏法脱硫工艺适合红土镍矿回转窑烟气脱硫。     

氧化锌法脱硫技术在回转窑烟气处理中的应用

湿法炼锌过程中产出的浸出渣,采用回转窑处理,排放的烟气SO2浓度峰值期间达不到国家颁布的最新排放标准.通过对烟气脱硫工艺的研究分析,并结合生产实际情况,最终采用了氧化锌法工艺处理回转窑烟气.该技术应用使回转窑烟气SO2浓度降到400 mg/Nm3以下,达到国家铅锌行业最新排放标准.并且脱硫剂利用厂内生产过程的产生的烟尘...     

LJS工艺在凌钢200万t球团烟气脱硫除尘项目的应用

介绍了循环流化床干法脱硫及多组分污染物协同净化工艺(简称LJS-FGD)的原理及技术特点,并对链箅机回转窑烟气特点、凌钢200万t链箅机回转窑烟气采用LJS-FGD法进行脱硫效果予以阐述。     

回转窖尾气氧化锌脱硫技术及其应用

某冶炼厂采用回转窑回收锌氧压浸出液针铁矿除铁产出铁渣中的氧化锌,原来采用传统的钙法脱硫工艺处理回转窑烟气,存在脱硫效果差、排放尾气不达标、石膏渣难处置、开工率低等问题.经多方考证后,决定改用氧化锌脱硫工艺进行处理,脱硫剂采用自产氧化锌烟尘或焙砂,产出的二氧化硫返回制酸系统,酸解液返电锌系统,不产生二次固体废物.新系统投...     

首钢球团烟气脱硫工艺及设备的优化与改造

首钢1~#氧化球团生产线采用链篦机-回转窑-环冷机工艺,其烟气脱硫采用脱硫除尘一体化的密相塔半干法脱硫技术。原生产原料85%为低硫自产磁精矿粉,设计进口烟气SO_2含量≤800 mg/m~3,随着高硫秘鲁精矿粉配加比例逐步提高至40%后,脱硫塔进口烟气SO_2含量由750 mg/m~3升高至1 100 mg/m~3。通过对循环灰输送工艺、密相塔加灰工艺、循环灰加湿搅拌装置、除尘进口布风工艺等环节进行优化与改造,保证了外排烟气出口SO_2含量≤180 mg/m~3。     

氨法脱硫在回转窑烟气治理中应用

根据工作实际,阐述了回转窑烟气采用氨法脱硫存在的问题。解决了脱硫自身水平衡、烟气中粉尘量大、设备阻力大、杂质元素等对脱硫影响的问题。     

烧结烟气脱硫工艺探讨

文章介绍了国内外烧结(球团)烟气脱硫工艺发展及应用,并结合实例进行了基于石灰脱硫的湿法及半干法脱硫工艺的技术经济性比较,并提出了烧结(球团)烟气脱硫工艺选择意见,对今后钢铁企业投资建设烧结(球团)烟气脱硫工艺具有借鉴意义.     

硫铵法与循环流化床法烧结烟气脱硫技术的比较

在收集国内现有烧结烟气脱硫工程监测资料的基础上,对硫铵法和循环流化床法烧结烟气脱硫工艺的脱硫效率、经济技术指标等进行了比较.分析后认为循环流化床法烧结烟气脱硫工艺是现阶段比较适合我国国情的脱硫技术.同时建议加强对脱硫副产石膏的综合利用研究.     

铜冶炼环集烟气脱硫系统的改造实践

某铜冶炼厂脱硫系统处理烟气为冶炼环保烟气和精炼工艺烟气。以上两部分烟气混合后进入一套烟气脱硫系统内,采用石灰石-石膏法烟气脱硫工艺进行处理。其中环保烟气包括奥炉及电炉环保排烟、转炉环保排烟、主厂房环境集烟、精炼炉环保排烟、精炼工艺烟气脱硫四部分。为了提高脱硫效率以满足日益提高的排放标准,将现有脱硫工艺改为石灰石法+双氧水法脱硫工艺、现有动力波洗涤器改造为一级脱硫(除尘)塔,采用石灰-石膏法脱硫,现有脱硫塔作为二级脱硫塔(除雾),采用双氧水法脱硫。改造后脱硫系统运行达到了设计指标,产出了合格的石膏,同时达到了烟气排放标准的要求。     

回转窑处理锌浸出渣系统设计分析

介绍了回转窑处理锌浸出渣系统的各生产工序,结合实际生产和工程设计经验,配料系统宜采用减压仓和湿式圆盘给料机,回转窑挥发系统需控制好反应温度,供风系统风压宜选择0.1~0.12 MPa,烟气脱硫系统应充分考虑烟气量和温度波动的影响。     

转炉炉壳热应力分析

根据实际转炉建立实体模型。以有限元为手段,考虑了炉衬和炉壳材料的物性参数随温度变化的特点和炉衬与炉壳之间膨胀间隙,计算了转炉炉壳在温度载荷和炉衬膨胀压力同时作用下的热应力。所得结果可为转炉炉壳设计提供依据。     

焦炭热性能指标意义浅析

通过对焦炭在高炉内的历程及其变化规律的剖析,阐述焦炭热性能指标的意义,形象地把焦炭在高炉内的损耗分为三部分(M1,M2,M3)。指出M2对焦比及焦炭价格有一定的指导作用。     

Results of treatment of cancer of the cardia

Cancer of the cardia is traditionally discussed with cardiac cancer of the lower portion of the esophagus and upper gastric cancer invading the esophagus, and the specific characteristics of cancer of the cardia have never been clearly defined. We reviewed the outcome of 172 patients with adenocarcinoma of the cardia who had undergone radical surgery between 1949 and 1994 in the Division of Gastrointestinal Surgery of the Cancer Institute Hospital. The centers of the tumors were located within 2 cm above and below the boundary between the esophagus and the stomach, and their longitudinal diameter was less than 8 cm. We divided the patients into an early period (1949-1979; n = 79) and a late period (1980-1994; n = 93), and focused on the historical transition. There were no differences in patient gender or histology between the two periods. However, the late period was associated with fewer cases of esophageal invasion and shorter longitudinal diameter, as the age of the population advanced. The number of advanced cancers such as the localized and infiltrative type had decreased, and early cancer and early clinical stage had become more common, but despite the fact that the number of early cancers had increased, extended dissection, such as thoracic and paraaortic lymph node dissection, was performed more frequently. By clinical stage, the long-term outcome markedly improved in Stage I patient in the late period, and tended to improve in Stage II and III patients. This appears to have been attributable to the prevention of micrometastasis by extended dissection, although the number of early cancers is another major potential cause. There were no differences in the outcome of Stage IV patients between the two periods, and further advances in multimodality therapy must be awaited. The range of resection is basically proximal gastrectomy, and if there are adequate indications, the prognosis is favorable. In view of the status of lymphatic flow and lymph node metastasis, and long-term results, lateroaortic lymph node dissection is important. Since the number of early cancer patients has been increasing, if intraabdominal recurrence is prevented, intrathoracic lymph node dissection will contribute greatly to the outcome of such patients.     

The effect of amount of possession of the trait of hostility on accuracy of perception of hostility in others.

Some theories of personality hold that an individual's perception of others is influenced by his own personality characteristics; more specifically, that a trait of low social value will be projected more into others, and that insight into the possession of these characteristics reduces this distortion. These 2 hypotheses were tested by having a group of college students rate each other (including themselves) on degree of friendliness or hostility. Agreement with group rating about self yielded the insight score. In general, the hypotheses were supported; the "friendly" Ss were most accurate in their perception of others, and insight was positively associated with accurate perception. From Psyc Abstracts 36:04:4HL16M. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Effect of antibiotics of chemotaxis of human leukocytes

The effect of 20 different antibiotics on chemotaxis by human neutrophils was studied. Human leukocytes incubated with chloramphenicol, rifampin, sodium fusidate, and tetracyclines in vitro showed markedly depressed migration. The mechanisms by which these antibiotics affect leukotaxis are discussed.     

Quality of life of relatives of mental patients

Usage of quality of life of psychiatric patients' relatives as the parameter of estimation of the quality of psychiatric care is considered. By means of standard questionnaire elaborated by the authors as well as by means of both individual and group conversations the quality of life was analyzed in 40 relatives which lived together with psychiatric patients. Different spheres of their life and difficulties (financial, social-psychologic, production) were examined in families with such patients. The defects of psychiatric care that had direct influence on the quality of life of the psychiatric patients' relatives are outlined.