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Application of Dual Throttling Air-Conditioning System to explosion-proof Frequency Converter

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Transactions of Tianjin University 2015年第2期21卷 95-103页

作者：张于峰高岩盛颖 School of Environmental Science and Engineering Tianjin University Collaborative Innovation Center of Chemical Science and Engineering

An explosion-proof dual throttling air-conditioning system was put forward to solve the heat dissipation and internal dewing problems of explosion-proof frequency converter in the underground coal mine. This study investigated the feasibility and benefits of explosion-proof dual throttling cooling and dehumidification air-conditioning system applied to the explosion-proof frequency converter. The physical model of dual throttling air-conditioning system was established and its performance parameter was described by mathematical method. The design calculation of the system has also been done. The experimental result showed that the system reached the steady state at the refrigeration mode after running 45 min, and the maximum internal temperature of the flame-proof cavity was 31.0 ℃. The system reached the steady state at the dehumidification mode after running 37 min. The maximum internal relative humidity and temperature of the flame-proof cavity were 33.4% and 36.3 ℃, respectively. Therefore, the proposed system had excellent ability of heat dissipation and avoided internal dewing. Compared with water cooling system, it was more energy-saving and economical. The airflow field of dual throttling air-conditioning system was also studied by CFD simulation. It was found that the result of CFD numerical simulation was highly consistent with the experimental data.

关键词： explosion-proof converter dual throttling air-conditioning CFD energy saving heat dissipation dewing

A STUDY ON HEAT PIPE RADIATOR USED FOR THE COOLING OF THE HIGH-POWER THYRISTOR IN explosion-proof SHELL

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Journal of China University of Mining and Technology 1994年第2期4卷 99-103页

作者：李传统韩淑英丁毅

The cooling of the high-power thyristor (HPT) in explosion-proof sbcll (EPS) used inmining pit has been a difficult problem for a long time. It has some spectal demands. According toheat pipe’s working principle, this paper introduced a kind of newly devcloped beat pipe radiatorSeveral HPT in EPS can be cooled by one beat pipe. In order to obtain the cooling and forced convection cooling , two dimensionless equations were obtained. This paper also studicd the refation between the surface temperature of HPT and the working electric current. The corresponding curvewas given out. Experiments shown that the beat pipe radistor introdued in this paper could effectively cool the HPT in EPS. It becomes a practical and valuable new technique.

关键词： thyristor explosion-proof heat pipe

EFT/B interference transmission model and method of anti-interference in a coal mine monitoring substation

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Mining Science and Technology 2010年第3期20卷 391-394,399页

作者： MA Fengying College of Electronic Information and Control Engineering Shandong Institute of Light Industry Jinan 250100 China State Key Laboratory of Coal Resources and Safe Mining China University of Mining & Technology Beijing 100083 China

Coal mining monitoring system has been enforcing tests for the immunity of Electromagnetic Compatibility(EMC) since ***,not all monitoring substations can pass the Electrical Fast Transient/Burst(EFT/B) immunity test and the explosion-proof test *** order to enhance EMC,the EFT/B interfere transmission model was presented at the substation power port,after the EFT/B test method was used to analyze the monitoring substation power ***,a low-pass filter was designed by using the simulation software PIPICE and an anti-jamming method was proposed by way of a parallel connection of the discharge interfere circuit and the low-pass *** improved complex EMI filter was made up of an interference discharge device and a *** dynamic equivalent circuit was proposed for the EFT/B immunity *** a result,the monitoring substation has passed the EFT/B immunity and explosion-proof tests with the complex *** is concluded that the complex EMI filter has significantly enhanced the immunity of the coal mining monitoring system.

关键词： coal mining monitoring system explosion-proof electrical fast transient/burst complex filter