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高瓦斯水淹巷道的防爆缩封技术实践
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作者 周福宝 王德明 +2 位作者 张玉良 李祥 周建新 《煤炭科学技术》 CAS 北大核心 2007年第11期51-54,共4页
集成创新了高瓦斯水淹区域的锁风注氮、木筏运人载料、逐段解封技术,解决了高瓦斯水淹巷道防爆缩封的技术难题,防止了缩封过程发生火区复燃和瓦斯爆炸。
关键词 矿井火灾 缩封 爆炸 火区
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自然发火瓦斯超限条件下的安全封闭与缩封恢复
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作者 周军民 《煤矿开采》 2006年第2期64-66,79,共4页
介绍了两起重大自燃火灾在瓦斯超限情况下的安全封闭技术方法及缩封恢复措施,在同类型矿井中具有借鉴意义。
关键词 自然发火 瓦斯超限 安全 缩封恢复
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长沟煤矿井下火区治理与缩封经验
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作者 雷庆忠 付力伟 《中国高新技术企业》 2012年第13期127-130,共4页
文章针对长沟煤矿15116工作面发生自燃的现状,通过采取封闭火区、均压,使得15116工作面煤自燃得到有效抑制;采用积水封闭巷道的办法进一步密闭火区,同时采用注氮措施,使得工作面CO超限得到有效治理。并根据监测数据分析了封闭前后火区... 文章针对长沟煤矿15116工作面发生自燃的现状,通过采取封闭火区、均压,使得15116工作面煤自燃得到有效抑制;采用积水封闭巷道的办法进一步密闭火区,同时采用注氮措施,使得工作面CO超限得到有效治理。并根据监测数据分析了封闭前后火区的燃烧状况,依据气体组分比率判断了火区不存在复燃环境,结合《煤矿安全规程》实现了火区安全缩封。 展开更多
关键词 长沟煤矿 井下火区 高压注氮 缩封工作面
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一次特大瓦斯爆炸后灾区的处理
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作者 章立清 周德永 《煤矿安全》 CAS 北大核心 2000年第1期18-19,共2页
本文总结了谢一矿“6.23”瓦斯事故灾区内的火区处理、缩封探险、火区启封及巷修全过程,为类似事故的处理提供了经验。
关键词 瓦斯爆炸 灾区 缩封 火区处理
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注氮防灭火技术在煤矿中的应用 被引量:14
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作者 肖蕾 郭玉东 张平银 《宁夏工程技术》 CAS 2009年第1期19-23,共5页
为了有效预防、控制和扑灭井下火灾,通过煤矿对注氮防灭火的实践应用,认为以注氮为主的防灭火是井下预防火灾和减少火灾损失的一种非常有价值和实用的技术,它可用于煤矿自燃发火的预防(稳定和控制发热)、火势控制、窒息火区、可控制的... 为了有效预防、控制和扑灭井下火灾,通过煤矿对注氮防灭火的实践应用,认为以注氮为主的防灭火是井下预防火灾和减少火灾损失的一种非常有价值和实用的技术,它可用于煤矿自燃发火的预防(稳定和控制发热)、火势控制、窒息火区、可控制的缩封和启封火区.当氮气注入工作面采空区或火区,使氧含量降低到5%~10%时,可抑制煤的氧化自燃以及瓦斯爆炸,而氧含量降低到3%以下时,则可以使煤炭燃烧熄灭并阻止其复燃.该技术在宁夏煤矿火灾的防治中得到多次应用,其技术处在国内先进水平之列,对于开采自燃煤层煤矿火灾预防与防治具有积极的推广价值. 展开更多
关键词 煤矿 工作面 注氮 缩封 防灭火
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某火电机组EPRO MMS6000系统轴振测点故障分析及处理 被引量:1
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作者 郭兴胜 《黑龙江电力》 CAS 2019年第3期273-274,279,共3页
某660 MW火电机组运行中经常会出现的轴振跳变问题。通过故障现象分析PR 6423/10R-030探头和延伸电缆LEMO接头在机组运行中存在的问题,找到轴振测点发生故障的原因,并给出相应的技术措施,即取消缩封对接头。该措施减少了机组大小修过程... 某660 MW火电机组运行中经常会出现的轴振跳变问题。通过故障现象分析PR 6423/10R-030探头和延伸电缆LEMO接头在机组运行中存在的问题,找到轴振测点发生故障的原因,并给出相应的技术措施,即取消缩封对接头。该措施减少了机组大小修过程中的工作量,维护后主机轴振测点的故障率明显降低。 展开更多
关键词 轴振 延伸电缆 缩封 故障分析
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Compressibility of fine-grained soils subjected to closed-system freezing and thaw consolidation 被引量:5
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作者 BOLEY Conrad 《Mining Science and Technology》 EI CAS 2009年第5期631-635,共5页
In order to investigate the effects of freezing and thawing on the compressibility of fine-grained soils, freezing and thawing tests and subsequent compression tests with fine-grained soils in an oedometer were carrie... In order to investigate the effects of freezing and thawing on the compressibility of fine-grained soils, freezing and thawing tests and subsequent compression tests with fine-grained soils in an oedometer were carried out. During the freezing, a part of the soils is loosened and another part is over-consolidated under the freezing pressure σE. The compression curves after the freezing and thaw consolidation are neither different from the normal consolidation curve nor from the rebound curve of an unfrozen soil, until the consolidation pressure σz = σE is arrived. Based on the experimental results, a theoretical model has been devel- oped to predict the frost heaves, the thaw-settlements and the compressive deformations of fine-grained soils after the thaw consolidation. The theoretical results are very close to the experimental results. 展开更多
关键词 ice lens frost heave thaw settlement COMPRESSIBILITY
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Development of Experimental Device for Compression Load Deflection of Car Door Seals
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作者 赵建才 朱训生 万德安 《Journal of Donghua University(English Edition)》 EI CAS 2003年第2期116-121,共6页
A new experimental device has been developed for analyzing compression load deflection of the door seal by using stereovision theory. Precision instruments of optical grating and force sensor are also integrated in th... A new experimental device has been developed for analyzing compression load deflection of the door seal by using stereovision theory. Precision instruments of optical grating and force sensor are also integrated in this device. Force-displacement response characteristics of compression at varied speed can be controlled. Solid foundations for characteristic and structure as well as optimization design of the car door seal are elucidated. 展开更多
关键词 experimental device compression load deflection SEALS
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Study on seal improvement and rotor thrust control of centrifugal compressor
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作者 王维民 Gao Jinji Li Shuangxi Jiang Zhinong 《High Technology Letters》 EI CAS 2007年第3期273-278,共6页
Fluid pressure variations due to process fluctuations or balance drum seal degradation can result in rotor thrust increasing that may jeopardize thrust bearing and compressor’s reliability. Also, the leakage flow thr... Fluid pressure variations due to process fluctuations or balance drum seal degradation can result in rotor thrust increasing that may jeopardize thrust bearing and compressor’s reliability. Also, the leakage flow through balance drum seal can seriously affect the efficiency of compressor. A method that can improve both the efficiency and reliability of centrifugal compressor is presented. The method focused on rotor thrust control and balance drum seal upgrading. The low leakage feature of Dry-Gas-Seal(DGS), high reliability of labyrinth, and the feasibility of upgrading existing structure are taken into account at the same time to design a combined labyrinth-dry gas seal system on the balancing drum. Based on the combined seal system, a Fault Self-Recovering(FSR) system for the fault of rotor shaft displacement is introduced to assure the safety and reliability of centrifugal compressor. The modern Computational Fluid Dynamics(CFD) is used to validate this envision. The numerical result and relevant information indicate that the combined sealing system could improve the efficiency of the centrifugal compressor by about 4%. 展开更多
关键词 centrifugal compressor EFFICIENCY dry gas seal rotor thrust FSR
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Numerical Analysis of the Thermal Behavior of a Hermetic Reciprocating Compressor
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作者 Stefan Posch Johann Hopfgartner +4 位作者 Erwin Berger Bemhard Zuber Lukas Dtir Stefan Stangl Raimund Almbauer 《Journal of Earth Science and Engineering》 2017年第1期1-9,共9页
A numerical model to predict the temperature field in a hermetic reciprocating compressor for household refrigeration appliances is presented in this work. The model combines a high resolution three-dimensional heat c... A numerical model to predict the temperature field in a hermetic reciprocating compressor for household refrigeration appliances is presented in this work. The model combines a high resolution three-dimensional heat conduction formulation of the compressor's solid parts, a three-dimensional CFD (computational fluid dynamics) approach for the gas line domain and lumped formulations of the shell gas and the lubrication oil. Heat transfer coefficients are determined by applying CFD to the gas line side and correlations from the literature on the shell gas and oil side, respectively. The valve in the gas line simulation is modelled as a parallel moving fiat plate. By means of an iterative loop the temperature field of the solid parts acts as boundary condition for the CFD calculation of the gas line which returns a cycle averaged quantity of heat to the solid parts. Using an iteration method which is based on the temperature deviation between two iteration steps, the total number of iterations and consequently the computational time can be reduced. The loop is continued until a steady-state temperature field is obtained. Calculated temperatures of the solid parts are verified by temperature measurements of a calorimeter test bench. 展开更多
关键词 COMPRESSOR SIMULATION CFD.
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Reducing the Gas Pressure Drop in Suction Mufflers of Hermetic Reciprocating Compressors
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作者 Janatas Ferreira Lacerda Jose Luiz Gasche +1 位作者 Joao Fabio Parise de Lara Danilo Martins Arantes 《Journal of Energy and Power Engineering》 2014年第3期423-430,共8页
The suction muffler of hermetic reciprocating compressors is installed in order to attenuate the noise generated by the gas pulsation of the flow through the suction valve. However, the installation of the suction muf... The suction muffler of hermetic reciprocating compressors is installed in order to attenuate the noise generated by the gas pulsation of the flow through the suction valve. However, the installation of the suction muffler affects the operation of the compressor owing to gas pressure drop, which causes volumetric and energetic efficiency loss due to the gas specific volume augmentation. Therefore, there is a compromise between sound attenuation and pressure drop increase, which has to be taken into account by compressor designers. In this work, it presents a numerical solution to the flow through a suction muffler in order to analyze the pressure field and point out the main contributions to the overall pressure drop of the flow. A commercial CFD (computational fluid dynamics) code was used to perform the numerical simulations and the results were validated by using experimental data. After analyzing the pressure field, the geometry of the muffler was modified intending to decrease the flow pressure drop. The geometric modification produced a 28% reduction on the overall pressure drop, without influencing the sound attenuation. 展开更多
关键词 REFRIGERATION hermetic reciprocating COMPRESSOR muffler.
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含油砂岩的高瓦斯煤矿火灾灭火技术 被引量:8
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作者 袁崇亮 徐成林 王君德 《煤矿安全》 CAS 北大核心 2015年第8期68-70,共3页
海石湾煤矿6112工作面采空区自然发火,引燃了上部油砂岩下泄到采空区的油气,迅速扩大为全矿大火。矿井采用注大流量气氮、液氮和二氧化碳的方法,抑制了瓦斯爆炸,安全封闭了全矿6个井口,并采用缩封技术和大流量高压水枪降温技术,将火区... 海石湾煤矿6112工作面采空区自然发火,引燃了上部油砂岩下泄到采空区的油气,迅速扩大为全矿大火。矿井采用注大流量气氮、液氮和二氧化碳的方法,抑制了瓦斯爆炸,安全封闭了全矿6个井口,并采用缩封技术和大流量高压水枪降温技术,将火区从井口缩封到工作面,采用消火道钻孔注浆灭火技术彻底扑灭了火源。介绍了抢险救灾过程中的抑爆封闭技术、缩封技术、消火道灭火技术及灭火效果。 展开更多
关键词 油气火灾 液氮抑爆 缩封技术 消火道灭火 注浆
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Experimental Study on Frictional and Sealing Performances of Packing Rings in an Oil-free Gas Compressor
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作者 杨学宾 晋欣桥 +2 位作者 杜志敏 崔天生 杨绍侃 《Journal of Shanghai Jiaotong university(Science)》 EI 2009年第6期725-731,共7页
To enhance the reliability and to extend service life of packing rings, tribological and sealing perfor- mances are investigated based on the experimental results. Friction force, leakage rate and power consumption of... To enhance the reliability and to extend service life of packing rings, tribological and sealing perfor- mances are investigated based on the experimental results. Friction force, leakage rate and power consumption of three materials of pressure packing seals are measured in a refitted vertical gas compressor. The rings are made of common filled polytetrafiuroethylene (Filled PTFE), PTFE reinforced with 30% mass fraction carbon fiber (30%CF^PTFE), and carbon-carbon composites infiltrated with PTFE (C/C+PTFE), respectively. It is found that packing rings will periodically vibrate with the periodic vibration of pressure packing after the travel direction of motion abruptly turns to the reverse direction. Furthermore, the amplitude of vibration slows down with the increasing crank angle. Approximate value of friction force is available by multiple-point fast Fourier transformation (FFT) employed to process the experimental results by reducing the impact of vibration to a great extent. Of three materials of rings employed in experiments, Filled PTFE presents minimal leakage rate accom- panied with maximum power consumption. And 30%CF+PTFE exhibits minimum friction power and moderate leakage rate. As for C/C+PTFE, its high mechanical and thermal properties are favorable factors to enhance the ability of operating under high pressure and velocity and to improve the wear resistance. Unfortunately, this also leads to a large leakage rate. Comprehensive consideration should be taken into to evaluate the availability, reliability and service life for a type of packing ring under dry running conditions. 展开更多
关键词 frictional performance SEALING experimental study packing rings oil-free lubrication
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