共查询到20条相似文献,搜索用时 78 毫秒
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针对当前国家制定的低碳方针及炼铁成本偏高、钢铁企业追求低成本炼铁的目标,采用Rist操作线法及C-rd两种方法分析了高炉炼铁过程中的碳消耗。对高炉炼铁成本进行系统分析得出:两种方法计算出的高炉炼铁碳消耗结果基本相同,误差范围在1%~2%;在ηCO55%~58%热消耗接近9 GJ/t的情况下,单位生铁的碳消耗是高炉炼铁的低碳目标,目前中国高炉的燃料比要比低碳炼铁的燃料比高出80 kg/t以上;原燃料价格低并不等于生铁成本低,应根据焦炭、煤粉、熔剂、矿石及烧结矿的综合成本来科学计算评估炼铁生产成本。由于当前产能过剩,高炉工作者应从追求产能转变为保证炉况顺行、稳定炉腹煤气量、实现低碳低成本炼铁。 相似文献
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文章介绍了攀钢钒炼铁厂在低成本炼铁方面所做的工作,通过物料结构优化和2000 m3级高炉高钛型钒钛磁铁矿冶炼技术进步,攀钢生铁成本不断下降,生铁综合成本在全国57家大钢中排名第三,生铁成本比较优势做到历史最好水平. 相似文献
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战志新 《冶金标准化与质量》1996,(Z2)
冶金焦炭是焦化厂的主要产品,它是高炉炼铁的主要原料之一,在高炉冶炼过程中起着热源、还原剂和料柱支撑等作用。所以它的质量好坏直接关系到炼铁生产的能耗,高炉生产能力,高炉炉龄,生铁质量等。近年来,随着高炉冶炼技术的提高,高炉大型化和高炉富氧喷煤冶炼新工艺的逐渐推广,对冶金焦炭质量提出了更高的要求,特别是机械强度质量指标。可以说,当前冶金焦炭质量差在一定程度上制约了我国高炉冶炼技术的发展及冶炼水平的提高。 相似文献
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Saeed N. Ghali 《国际钢铁研究》2013,84(5):450-456
This article aims to investigate the effect of soluble and insoluble nitrogen on mechanical properties of stainless steels. Reference steel contains about 14.42%Ni and 0.012%N. Two developed steels have the same base chemical composition of the reference steel except Ni and N contents. One of the developed steels has 6.54%Ni and 0.232%N and the other has 0.452%N and nearly nickel free (0.089%Ni). The produced steels were forged, heat‐treated, and tempered. The microstructure of steels was mainly austenite, and grain size decreases as nitrogen content – especially nitrides‐increases. Yield and ultimate tensile strength of reference steel are less than that of steels containing nitrogen. Strengthening mechanisms contribution to the strength of both soluble and insoluble nitrogen had been analyzed. 相似文献
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C波段单片低功耗低噪声放大器 总被引:1,自引:0,他引:1
报道了一种新型的C波段 0 .5μmPHEMT单片低功耗低噪声放大器。该放大器由三级级联构成 ,采用电流回收技术 ,实现了低功耗的目的。芯片面积为 2 .1× 1 .8mm2 ,直流功耗为 1 2 5mW (VD=5V ,ID≤ 2 5mA)。封装后测试结果为 :在C波段 ,带宽 1 .1GHz,增益 >2 5 .7dB ,增益平坦度≤± 0 .6dB ,噪声系数≤ 1 .72dB ,输入、输出电压驻波 <2∶1 ;带内最小噪声系数为 1 .61dB ,相关增益为 2 6 .3dB。测量结果与设计符合得较好。 相似文献
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电炉生产低碳低硅钢的难点是电炉的终点控制、脱氧合金化以及钢中[Al]的控制和精炼炉抑制回硅.介绍了八钢110t电炉生产SPHC钢从原材料到冶炼过程严格按标准化操作,电炉精炼及连铸全程保护浇注,防止钢水的二次氧化减少夹杂物带入的生产实践. 相似文献
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RL Jurado C del Rio G Nassar J Navarette JL Pimentel 《Canadian Metallurgical Quarterly》1998,91(7):624-629
BACKGROUND: The purpose of this review is to provide a differential diagnosis for a low anion gap. METHODS: We describe the anatomy of the anion gap. Also, we follow-up with a review of the English-language literature describing the causes of a low anion gap. During the past 15 years, the introduction and widespread clinical use of ion-selective electrode methodology for measuring serum electrolyte values has caused a major fall in the normal range of the anion gap from 12 mEq/L +/- 4 mEq/L to 6 mEq/L +/- 3 mEq/L; therefore, a new definition for a low anion gap is in order. RESULTS: Based on current clinical data, an anion gap value of < 3 mEq/L should be considered low. A low anion gap is a useful diagnostic tool, but its clinical significance is often unrecognized. Also, it may be a handy clinical clue for the diagnosis of life-threatening intoxications or occult neoplasms, such as multiple myeloma. The baseline low anion gap may mask the identification of a high gap metabolic acidosis in certain patients. CONCLUSIONS: Interpretation of a low anion gap can provide valuable clinical information. 相似文献
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B Hainline 《Canadian Metallurgical Quarterly》1995,14(1):241-265
Low back injuries occur commonly in tennis, but the pathophysiologic, biomechanical, and clinical characteristics are not well defined. Tennis players may be at an increased risk of lumbar disc pathology from rotational and hyperextension shearing effects. Treatment of low back injury at present is empiric, but sport-specific lumbar stabilization and unloading of the lumbar disc should be developed. Prospective longitudinal research protocols are needed to study the lumbar spine in tennis players. 相似文献
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通过优化转炉出钢、CAS精炼、RH处理等过程的脱氧工艺和造渣制度,形成合理的钢包精炼渣系,为充分吸附钢水中的夹杂物创造良好条件;利用钙处理工艺,将钢水中的Al2O3夹杂球化,使钢中大部分Al2O3转变为液态Ca O-Al2O3,为连铸机顺利浇铸创造条件;按照KR→BOF→CAS→RH→CCM工艺路线生产低碳低硅铝镇静钢,将钢水中的Si含量控制在了钢种成分设计要求范围之内。 相似文献