梅钢实施高炉风口双枪喷煤技术改造

近日,宝钢集团梅钢公司启动2号高炉风口双枪喷煤技术改造项目,并在公司内部进行了技术转化。高炉风口双枪喷煤技术是通过在每个高炉风口上按照一定的角度配置2根煤枪进行喷煤,便于煤粉流在风口区的有效扩散,以改善煤粉的燃烧,从而最大限度实现以煤代焦,降低铁前生产成本,减少碳排放。但传统的喷煤方式为单风口、单煤抢,对喷煤量和喷吹效果有一定的限制。     

喷吹煤粉在高炉内行为的初步探讨

在高炉解剖的研究工作中,通过观测、采样、检验等工作,对喷吹煤粉的高炉进行了初步研究,借以了解煤粉喷入高炉后,在风口区的燃烧状况及其对冶炼的影响.1. 研究过程和方法1.1 停炉前的测试为研究喷煤进程,于10月1日开始喷煤,只2号风口喷,喷煤量为100kg/h.于15日起2号、4号风口喷,喷煤量为150kg/h.解剖停炉前45min加大喷吹量.喷吹所用煤种为京西无烟煤,煤粉由试验高炉小球磨机自制,筛分组成及水分测定结果列于表1.     

神户钢铁公司高炉高煤比喷吹

介绍了高炉煤粉大喷吹所要求的理论和方法.文章以中心加焦时进行的炉料分布控制,以获得稳定的软熔带形状的历史发展为起点,讨论了用于氧煤复合喷吹的双枪回旋区燃烧技术.依托这些改进技术,神户3号高炉地震后炉况的恢复以及加古川厂3号高炉开炉后的喷煤情况都很先进和顺利.文章最后分析了新世纪高炉在经济和环境方面未来的发展.     

石钢1,2号高炉喷煤系统设计及运行

1 前言 石钢3号高炉(300m~3)喷吹工艺引进了德国KOSTE工艺技术,并于1993年建成投产。1998年4月相继建成了2号(300m~3)和1号(150m~3)高炉喷煤工程,至4月底,石钢3座高炉全部喷煤,喷吹100％烟煤,并可按风口调节、控制喷煤量。     

涟钢6号高炉风口磨损的原因及对策

对涟钢6号高炉喷煤磨损风口的原因及对策进行了阐述.通过喷枪结构形式、插入深度、插入角度等方面的分析,提出了解决问题的技术措施.     

大中型高炉用煤粉分配器研制成功

在高炉喷煤系统中,煤粉分配器是一项重要设备,其分配性能对于喷吹煤粉沿高炉圆周的均匀分布起着关键作用.这对于风口数目较多的大中型高炉提高喷煤量时尤为重要. 根据冶金部关于在鞍钢进行富氧大喷煤工业试验的要求,冶金部钢铁研究总院承担了为鞍钢2000～2580m~3大型高炉研制煤粉分配器的任务,这三座高炉的风口数为20～26个,喷煤系统为双系列,每个系列供     

攀钢3,4号高炉喷吹系统的设计

1 喷吹工艺的选择 攀钢3号高炉有效容积1200m~3,有18个风口,1个铁口,距新建制粉车间1000m左右。4号高炉有效容积为1350m~3,有18个风口,2个铁口,2个渣口,距新建制粉车间也在1000m左右。喷吹系统设计时,根据实际需要决定每座高炉有16个风口喷煤。因为3、4号高炉离制粉车间都比较远,所以,设计     

天铁1号高炉富氧喷煤实践

天铁1号高炉通过必要的高炉设备改造，达到了提高风温、全风口均匀喷煤的目的。经过两年的技术攻关，技术经济指标得到较大改善，年均煤比达到172．8kg/t。介绍了富氧喷煤的发展过程，并对实践操作经验进行了总结。     

高品位烧结矿在太钢3号高炉的生产实践

太钢3号高炉针对烧结矿品位提高后所引起的炉况变化实行低硅冶炼、全风温操作、缩小风口面积、提高鼓风动能、提高喷煤比和终渣碱度等一系列操作参数的调整，使高炉技术经济指标得到了提升。     

武钢5号高炉减少风口损坏实践

对武钢5号高炉减少风口损坏的实践进行了总结。通过采取合理煤气流分布、增加鼓风动能、煤枪技术改进、加强喷煤管理等一系列措施,取得明显效果,风口损坏数目明显减少。     

Some fundamentals of B. F. Skinner's behaviorism.

Despite B. F. Skinner's prominence, his impressive written corpus, and the many authoritative presentations by others of his approach to psychology, the fundamentals of Skinner's psychology have never been addressed in any comprehensive manner. In this article, the authors take steps to fill this gap by synopsizing Skinner's written corpus into 12 fundamental points that seem to characterize his behaviorism. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Educators' perceptions of the D.A.R.E. program

This study examines the perceptions of educators about the Drug Abuse Resistance Education (D.A.R.E.) program, based on the results of a statewide survey among 286 fifth and sixth grade teachers and principals. Educators gave their highest ratings to teacher/officer interaction, the role playing exercises, and the graduation ceremony. Ratings of overall program quality and the impact of the program on students were both high. Block regression analysis was used to examine factors predictive of educators' views of D.A.R.E. D.A.R.E. program elements were the most important factors explaining variance in educators' ratings of over-all program quality and program impact on students. Altogether, 54 percent and 38 percent of the variance in both dependent variables were explained. The results are discussed in terms of the important role teachers and principals play as stakeholders in prevention education.     

Racemose angiomatosis. Comments on the article of D.E. Matsko and I.A.Sokolova. Racemose angioma of the nervous system: tumor or developmental defect? Vopr. onkol. 1966. V.42, No.6. p.91-96

Diversion colitis is thought to result from nutritional deficiencies secondary to fecal diversion. Symptoms include hemorrhagic purulent rectal discharge, abdominal pain, and tenesmus. 5-Aminosalicylic acid (5-ASA) and N-butyrate enemas have been reported to help this condition non-spinal cord injury (SCI) patients. We report the case of a 49-year-old C6 ASIA B tetraplegic man who had received colostomy because of intractable ileus 10 years earlier. He presented with a 2-week history of rectal pain and bleeding. Abdominal and rectal examination on admission were unremarkable. Colonoscopy showed a partial stricture 70cm proximally to the rectum. The colonic mucosa appeared granular and friable with evidence of linear ulceration. Histopathologic study was consistent with colitis. The patient developed fever, abdominal distention, and extensive retroperitoneal air after endoscopy, suggesting colonic perforation. He was treated with daily 5-ASA suppository and total parenteral nutrition for the presumed diagnosis of diversion colitis, and intravenous antibiotics for perforated colon. After 6 weeks of treatment with 5-ASA, the patient had decreased rectal pain and bleeding. This experience suggests that diversion colitis may be a cause of abdominal discomfort in SCI patients and that 5-ASA may be used in the management of diversion colitis.     

Structural bonding contributions and the elastic response of b.c.c. and f.c.c. crystals

The anisotropic elastic response of body centered cubic (b.c.c.) and face centered cubic (f.c.c.) crystals is reviewed within the framework of general elasticity and particular model dependent relations. It is found that important trends in the observed behavior of specific groups of crystals can be reproduced by models that include only structural contributions to crystal binding. In fact, a very simple model, consisting of only nearest and next nearest neighbor interactions, reproduces the salient behavior, including the algebraic signs of Poisson's ratio and the orderings of the shear moduli, Young's moduli, and Poisson's ratios associated with major crystallographic symmetries. The analysis provides insight into the differences between the b.c.c. transition metals and the b.c.c. alkali metals.     

Study of the h.c.p.-f.c.c. phase transition in cobalt by acoustic measurements

Acoustic measurements have been performed in the vicinity of the h.c.p.-f.c.c. phase transition in cobalt. The main results are the following: At low frequency (~ 1 Hz), a high transitory internal friction peak is observed. It is shown that this internal friction is a function of T/vT temperature rate, v vibration frequency) but is not proportional to T/v. This behavior is explained in the framework of a recent model based on a Clausius-Clapeyron-like equation expressing the coupling between stress and phase transition; At medium (~5 KHz) and high (~ 20 MHz) frequencies, the transitory internal friction becomes negligible. However, a small peak appears accompanied by an elastic modulus decrease. It is shown that these anomalies are related to the shear modes parallel to the transformation plane. Thus, they might be related to the motion of the partial dislocations composing the h.c.p.-f.c.c. interface.