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Structural optimization and design of purging plug for improving its service performance

Journal of Iron and Steel Research(International) 2022年第4期29卷 628-635页

作者： Fang-guan Tan Sheng-li Jin Zhu He Ya-wei Li The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan 430081HubeiChina National-Provincial Joint Engineering Research Center of High Temperature Materials and Lining Technology Wuhan University of Science and TechnologyWuhan 430081HubeiChina Chair of Ceramics Montanuniversitaet LeobenLeoben 8700Austria

purging plug with slits is widely used in the secondary refining process,and its service life determines the downtime and production efficiency.To achieve a good performance in service life,optimizing the geometric structure of the slit,which can alleviate the stress concentration around the slit,was employed using the finite plate model.Furthermore,the performance of the purging plugs with different shapes of slits in the refining effect was investigated by conducting the water model experiments.The numerical simulation results showed that the appropriate shapes of slits could alleviate the stress concentration phenomena.In the water model experiment,the mixing time of the purging plug with circular slits is lesser than that of the purging plug with rectangular slits when the gas flow is less than 6.02 L/min.Compared with the rectangular slits,the circular slits are detrimental to smaller and well-distributed bubbles.Thus,the inclusion removal rate of the purging plug with circular slits is approximately 10%larger than that of the purging plug with the rectangular slits.

关键词： purging plug Stress concentration Water model experiment Mixing time Inclusion removal Ladle metallurgy

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purging OF BONE MARROWS CONTAMINATED WITH MYELOID LEUKEMIC CELLS BY INTERLEUKIN-2 AND LYMPHOKINE-ACTIVATED KILLER CELLS

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中国实验血液学杂志 1995年第2期3卷 204-209页

作者：毛宁基础医学研究所血液与肿瘤研究室北京太平路27号100039

The capability of recombinant human interleukin-2 ( rhIL-2) and lymphokine-activated killer (LAK) cells in the purging of normal human bone marrows contaminated with human myeloid leukemic cell lines was evaluated. Mixtures of normal human bone marrow mononuclear cells ( BMC) and K562 cells or HL-60 cells (at the BMCK562 ratio of 200:1, 100:1 or 20:1) were incubated with IL-2 with or without LAK cells at the BMC:LAK ratio of 1:1 for one or three days. The nubmers of residual K562 cells, BFU-E and CFU-GM were examined by clonogenic assays. In 200:1 mixture groups without LAK cells, the number of K562 colonies reduced by 50% with no loss of BFU-E and CFU-GM in one-day cultures, and no K562 colonies formed in three-day cultures with about 20% loss of BFU-E and CFU-GM. If the BMC.K562 ratios were 100:1 or 20:1 in the mktures, the leukemic cells could not be eliminated. When the mixtures were incubated with IL-2 and LAK cells, no leukemic cell colonies were detected in the 20:1 group following one-day

关键词： interleukin-2 lymphokine-activated killer cell purging of bone marrow cells K562 cell HL-60 cell

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冷冻-解冻循环及气体吹扫对质子交换膜燃料电池的影响

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Chinese Journal of Chemical Engineering 2006年第6X期14卷 802-805页

作者：张生生俞红梅朱红侯俊波衣宝廉明平文 School of Science Beijing Jiaotong University Beijing 100044 China Fuel Cell Center Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian 116023 China

At subzero temperature, the startup capability and performance of polymer electrolyte membrane fuel cell (PEMFC) deteriorates markedly. The object of this work is to study the degradation mechanism of key components of PEMFC-membrane-electrode assembly (MEA) and seek feasible measures to avoid degradation. The effect of freeze/thaw cycles on the structure of MEA is investigated based on porosity and SEM measurement. The performance of a single cell was also tested before and after repetitious freeze/thaw cycles. The experimental results indicated that the performance of a PEMFC decreased along with the total operating time as well as the pore size distribution shifting and micro configuration changing. However, when the redundant water had been removed by gas purging, the performance of the PEMFC stack was almost resumed when it experienced again the same subzero temperature test. These results show that it is necessary to remove the water in PEMFCs to maintain stable performance under subzero temperature and gas purging is proved to be the effective operation.

关键词： polymer electrolyte membrane fuel cell (PEMFC), freeze/thaw cycle, electrode structure, performance degradation, gas purging

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Elimination of Oil Residual inside the Copper Pipe Using Ladder Technique

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Engineering（科研） 2013年第1期5卷 8-15页

作者： Witsarut Sriratana Riichi Murayama Department of Intelligent Mechanical Engineering Faculty of Engineering Fukuoka Institute of Technology Fukuoka Japan

This study presents the methodology to eliminate oil residual in copper pipe due to rolling process for manufacturing coil used in air conditioner. The pressure caused by Nitrogen flow rate was applied starting from 0, 5, 10, and 15 bar, respectively which was depending on time delay and pipe length. The developed system was divided into 2 modules: Parallel pressure ladder module (PPLM) [1] and Serial pressure ladder module (SPLM) which were experimented with 2 sizes of copper pipe: diameter 7.29 mm, thickness 0.25 mm, and length 10 km, and diameter 8 mm, thickness 0.25 mm, and length 10 km. From experiment, it can be noted that PPLM would perform better in elimination of oil residual compared to SPLM. About 97.44% (0.04 mg/m) and 97.59% (0.05 mg/m) of oil residual can be respectively eliminated from diameter 7.29 mm pipe and diameter 8 mm pipe which exceeded the standard allowance of 30% or 0.1 mg/m. Moreover, the cost of Nitrogen can be reduced by 6.25% per month.

关键词： Copper Pipe Ladder Oil purging Pressure Residual PPLM SPLM

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人胎肝低分子天然抑瘤物体外培养净化自体骨髓移植治疗急性白血病的研究

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解放军医药杂志 1994年第2期16卷 82-84页

作者：杨科滕爱萍裴雪涛吴祖译王金才席延荣吴安玉何学鹏王立生唐晓东梅巍军区总医院血液科军事医学科学院放射医学研究所北京军区总医院放疗科

本文对17例急性白血病患者,在完全缓解期采用LMW-NTS体外培养净化后进行了自体骨髓移植,其中急性髓细胞白血病14例,急性淋巴细胞白血病3例。预处理以环磷酰胺和全身照射为主。移植后来接受抗白血病治疗,随访观察15至45个月,11例无病生存... 详细信息

本文对17例急性白血病患者,在完全缓解期采用LMW-NTS体外培养净化后进行了自体骨髓移植,其中急性髓细胞白血病14例,急性淋巴细胞白血病3例。预处理以环磷酰胺和全身照射为主。移植后来接受抗白血病治疗,随访观察15至45个月,11例无病生存≥+15月,8例≥+24月,5例≥+30月,最长1例为+43月。5例在+6-+22月复发。1例在+6月猝死。统计3.5年无病生存率为62.7％士15.0％。

关键词：自体骨髓移植 Autologous bone marrow transplantation 净化 purging 低分子 low molecular weight 天然抑瘤物 natural tumour suptressor 急性白血病 acute ieukemia

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