承德建龙烧结焦改煤降低燃料成本生产实践

烧结工序能耗中,固体燃料消耗占总能耗的75%-80%,电力占13%-20%,点火燃烧占5%~10%。所以,降低烧结工序能耗成本的关键是降低固体燃料成本。承德建龙2009-2010年对烧结工序固体燃料进行焦改煤实验调整,使用不同质量无烟煤与焦粉对比,烧结固体燃耗成本均出现降低。     

烧结工序节能分析

烧结工序能耗中,固体燃料消耗占总能耗的75％-80％,电力占13％-20％,点火燃烧占5％～10％。所以,降低烧结工序能耗的关键是降低固体燃耗。2008年烧结工序能耗先进单位的固体燃耗一般是在40～50kg／t,而落后企业的值则高达72kg／t。     

降低烧结固体燃耗的研究与生产实践

固体燃料消耗约占烧结生产总能耗的70%～80%,如何降低固体燃料消耗是降低烧结生产过程能耗的关键。目前天钢烧结工序固体燃料消耗为51.49kg/t,与国内先进水平比有较大差距,具有挖潜空间。本文分析了影响天钢烧结工序固体燃料消耗的主要因素,并结合烧结生产实际及设备现状,制定了一系列降低烧结固体燃料消耗的措施。通过提高料层厚度、降低漏风率、提高料温、优化熔剂结构等措施的实施,烧结固体燃料消耗下降至43.36kg/t,取得了良好的经济效益和社会效益。     

降低3#烧结机固体燃耗的实践

烧结工序的能耗约占钢铁生产总能耗的10%,这其中,固体燃料消耗占到70%~80%,所以,降低烧结固体燃料消耗是降低烧结工序能耗的主攻方向。介绍了安钢3#烧结机在降低固体燃料消耗方面所采取的措施和取得的进展。     

烧结工序节能降耗的技术措施

<正>烧结工序能耗在吨钢综合能耗中约占10%,仅次于高炉炼铁,是钢铁生产的第二耗能大户。烧结工序能耗包括固体燃料消耗、电力消耗、点火煤气消耗、动力(压缩空气、蒸汽、水等)消耗,其中固体燃料消耗占75%     

降低包钢烧结工序能耗的实践

在分析包钢烧结工序能耗结构的基础上,针对烧结固体燃料消耗偏高的问题,采取了多项节能措施:①改善燃料粒度组成,提高燃料粒度合格率;②提高烧结料层厚度;③降低烧结矿FeO含量;④提高烧结矿碱度合格率及稳定率。这些措施取得了良好的节能效果。与2006年相比,2008年包钢烧结固体燃料消耗减少了10.5%,烧结工序能耗降低了约9%。     

降低武钢烧结固体燃耗的实践及发展方向

论述了武钢烧结厂近年来在生产实践中降低固体燃料消耗方面所采取的措施与取得的进展,使武钢烧结厂固体燃耗逐年下降,并分析了影响烧结过程中的固体燃耗的因素,提出了今后进一步降低固体燃耗的方向.     

莱钢降低3×105m2烧结机工序能耗的实践

莱钢烧结厂采取控制原、燃料和白云石粒度、稳定烧结生产、推行低温烧结工艺、优化厚料层烧结技术、生石灰强化烧结、堵漏风、控制点火温度等一系列降低固体燃耗、电耗及煤气消耗的措施,工序能耗由2000年的72.50 kg/t降低到2006年上半年的58.02kg/t,取得了显著的经济效益。     

烧结过程中燃料利用率的提高

本文分析了我国烧结能耗的现状及燃料消耗较高的原因。着重讨论了改善资料燃烧状态，以提高燃料利用率，降低烧结固体燃耗的技术措施。     

烧结工序节能降耗的技术措施

烧结工序节能降耗可通过降低固体燃料、电力和点火煤气消耗等实现,其中降低固体燃料消耗是主要途径。文章介绍了降低固体燃料消耗、电力和点火煤气消耗的技术措施。     

Regional differences in suicide in Hungary in the light of registered cases of depression

Author made a revision on the theory published by Rihmer and alii in the year 1989. According to this theory the marked regional differences of suicide in Hungary are caused by the different discovery of the "endogen depression" (rate of diagnosed depression). So the lower is the diagnosis of depression the higher is the suicide rate in a given territory. They have seen a negative correlation between the number of working physicians and the suicide rates. Author made a reexamination on a correct database between 1985-1994. He has also made a study using the DSM-III-R diagnostic criteria in four counties of Hungary. His results deny the theory above mentioned. The rank-correlation of the number of GP and the suicide rates in Hungary in years 1985-1994 did not show correlation. So the underdiagnosis of the depressive disorders and the different number of GP are not the cause of the regional differences of suicide in Hungary.     

Role of clozapine in the occurrence of chromosomal abnormalities in human bone-marrow cells in vivo and in cultured lymphocytes in vitro

Bone-marrow chromosomes were examined from 38 mentally and physically retarded and two psychiatric patients who were being treated with a variety of neuropharmacologic drugs. Twenty of these patients used clozapine (Leponex). The clastogenic effects of clozapine in vitro were studied in the lymphocyte cultures of three patients--one free of hematologic disease and two who 6 months earlier had had agranulocytosis attributed to the use of clozapine. The mean frequency of cytogenetic abnormalities in the bone-marrow cells of patients who used clozapine was significantly increased (P less than 0.05). The two patients who had had agranulocytosis had a greater frequency of cytogenetic abnormalities in their cultured lymphocytes in vivo and in vitro than the patient free of hematologic disease. A clone with a 13/14 chromosome translocation was detected in one of the patients. As all patients received a number of drugs during the in vivo and in vitro studies no definite conclusions could be drawn regarding the role played by clozapine in the occurrence of chromosomal abnormalities.     

Inhibitory effect of suramin in rat models of angiogenesis in vitro and in vivo

The aim of the present study was to test the ability of the chemotherapeutic agent suramin to inhibit angiogenesis in experimental models in vitro and in vivo. In the culture of rat aortic rings on fibronectin, suramin dose-dependently inhibited vascular cell growth, achieving the maximal effect (mean - 88% versus controls, P < 0.05) at 400 microg/ml. Image analysis showed that suramin could inhibit microvessel sprouting in fibrin from rat aortic rings as evaluated by the ratio between the cellular area and the mean gray value of the sample (sprouting index); suramin at 50 microg/ml significantly reduced the sprouting index from the control value of 0.35+/-0.04 to 0.14+/-0.02 mm2/gray level (P < 0.05). Likewise, the area occupied by cells was 19.2+/-1.8 mm2 as compared with 41.8+/-4.2 mm2 in controls (P < 0.05). In the rat model of neovascularization induced in the cornea by chemical injury, suramin at 1.6 mg/eye per day reduced the length of blood vessels (0.7+/-0.1 mm as compared with 1.5+/-0.1 mm in controls, P < 0.05). In the same model the ratio between the area of blood vessels and the total area of the cornea (area fraction score) was decreased by suramin from 0.19+/-0.02 in controls to 0.03+/-0.003 (P < 0.05). Suramin given i.p. at 30 mg/ kg per day markedly inhibited the neovascularization induced in the rat mesentery by compound 48/80 or conditioned medium from cells secreting the angiogenic protein fibroblast growth factor-3 (FGF-3). The area fraction score in control rats treated with compound 48/80 was 0.31+/-0.03, and this was reduced to 0.07+/-0.01 by suramin (P < 0.05). After i.p. administration of FGF-3 the area fraction score was reduced by suramin from 0.29+/-0.03 to 0.05+/-0.01 (P < 0.05). These results provide evidence that suramin exerts inhibitory effects on angiogenesis in both in vitro and in vivo models.     

Difference in changes of plasma volume in two types of Goldblatt hypertension in rabbits

High plasma renin concentration (PRC) and hematocrit (Ht) were observed in hypertensive rabbits with one renal artery clipped and an intact opposite kidney (Group A), while rather low PRC and Ht in hypertensive ones with one renal artery clipped and the opposite kidney removed (Group B). Plasma volume (PV), blood volume (BV), and packed cell volume (PCV) were estimated in these two types of hypertensive rabbits, and also in sham-operated rabbits (Group C). In Group A, 4 weeks after clipping of a renal artery, PV was decreased and significant inverse correlations were observed between PV and the elevation of blood pressure and between PV and PRC. A significant correlation between PRC and the elevation of blood pressure was also found 4 and 12 weeks after the clipping. PCV was increased until 12 weeks after clipping. In Group B, PV was increased 1 and 4 weeks after clipping, then returned to the initial level. Ht was decreased 1 and 12 weeks, and PCV was decreased 12 weeks after clipping. These results would indicate that a high Ht seen in Group A was partly due to the decreased PV and partly due to the increased PCV, while, in Group B, a low Ht in early stage might be mainly due to the increased PV, but in the late stage, a decreased PCV appeared to play a role to lower Ht. PRC seems to be affected differently by PV in these two types of hypertension.     

CS1000在天铁烧结生产过程控制中的应用

结合天津铁厂烧结分厂二烧车间烧结过程控制的具体情况,介绍了分散型控制系统在烧结生产上的应用以及数据网上发布的一种方法。     

Epidemiology of trichinellosis in lynx in Finland

To examine the possibility of cytokine gene therapy in relation to pancreatic cancer, we evaluated the antitumor effect of human pancreatic carcinoma cells (AsPC-1) which were retrovirally-transduced with several kinds of cytokine genes. These cells were inoculated into BALB/c nude mice and their tumor volumes were assessed. The in vitro growth rate of the transduced cells was not different from that of a parental cell line. Among the transduced cells, human interleukin (IL)-6-transduced AsPC-1 and mouse granulocyte macrophage colony-stimulating factor-transduced AsPC-1 cells showed a significant retardation of tumor growth compared with a parental cell line. In the cases of AsPC-1 cells transduced with the human IL-2 or mouse IL-4 gene, small tumors were generated but thereafter they regressed completely. Histological examinations showed monocytic cell infiltration around the tumors of IL-2- or IL-4-producing cells. These data suggest that secretion of IL-2 or IL-4 from tumor cells can induce an antitumor effect even in the defective condition of mature T cells.     

Efficacy of lomefloxacin in treatment of nonspecific inflammatory diseases and in prophylaxis of postoperative complications in urology

Clinical and bacteriological efficacies of lomefloxacin and ofloxacin were comparatively estimated in the treatment of 104 urologic patients with nonspecific inflammatory diseases and in 36 urologic patients for prophylaxis of inflammatory complications after surgical interventions. The majority of the urinary tract pathogens i.e. Enterobacteriaceae spp. and gramnegative nonfermenting bacteria were highly susceptible to both the fluoroquinolones. The clinical and bacteriological efficacies of lomefloxacin amounted to 94.4 and 80.7 per cent and those of ofloxacin to 92 and 79.2 per cent respectively. The prophylactic use of lomefloxacin and ofloxacin was efficient in 94.7 and 94.1 per cent of the cases respectively. The antibacterial prophylaxis in urologic patients should be applied not only at the period of surgical interventions but also during the early postoperative period.