井下隔爆型变频器降温除湿空调系统的研究

发布时间：2018-05-31 17:55

  本文选题：隔爆空调 + 双节流空调　； 参考：《天津大学》2014年硕士论文

【摘要】：煤矿井下变频调速技术的使用,将可实现生产过程的自动化,提高生产效率,节约电能,综合经济效益和社会效益具有明显的提高。然而,井下环境恶劣,电气设备存在于含有瓦斯和煤尘等爆炸性气体环境中,必须采用隔爆壳体技术将变频器密封于隔爆壳体内,确保在壳体内所发生的电火花不会引爆壳体外部的爆炸性气体。然而,变频器在壳体内的散热严重影响其安全使用,同时冷热变化带来的结露效应也会造成严重的短路危害。针对隔爆变频器的散热和内部结露问题,本文提出隔爆型双节流空调系统。文中首先介绍了隔爆型双节流空调系统的工作原理。双节流空调系统采用模块化设计理念,综合考虑矿用防爆安全、气流组织合理以及形体结构简单等因素,运用隔爆壳体技术,通过理论计算和技术验证完成双节流空调系统结构设计。其次,针对变频器在壳体内的发热点位置,设计了个性化通风模式,实现了针对性地强化冷却模式,使设计的空调系统达到节省能量的效果。在之后的试验工作中,依据空调的制冷原理、冷却除湿理论以及耦合控制技术等,匹配设计出适合的隔爆型空调机组,并模拟井下环境进行实验。通过实验测试表明:双节流空调系统在制冷工况下,开机45分钟后,系统达到稳定,隔爆壳内最高温度31.7℃;在除湿工况下,开机37分钟后,系统达到稳定,隔爆壳内最大相对湿度33.4%,最高温度36.3℃。分析得出双节流空调系统散热快,除湿效果好,能够有效的避免壳体内部结露,与传统的水冷散热系统相比更加节能、经济和可靠。由于双节流空调性能获得方式的单一性,进一步运用计算流体仿真软件FLUENT对隔爆变频器空调散热系统进行数值模拟,得到实验工况和设计工况下散热模型的温度场云图、速度场云图等,对比分析空调系统送风温度对散热效果的影响。数值模拟表明:模拟和实验的结果有一致的趋势和很高的吻合度,空调系统制冷除湿性能优越。通过模拟设计工况下空调运行情况,证明该空调系统能够满足设计要求,为双节流空调系统优化设计和推广应用奠定基础。隔爆型双节流空调散热系统是一次全新的探索,通过CFD模拟和实验测试表明双节流空调系统制冷除湿性能优越。并且与其他的散热方式相比具有散热快,实现了温湿度耦合控制,运行安全可靠等诸多优点。
[Abstract]:The application of frequency conversion speed regulation technology in coal mine will realize the automation of production process, improve production efficiency, save electric energy, and improve the comprehensive economic and social benefits obviously. However, the underground environment is abominable and electrical equipment exists in the environment containing explosive gas such as gas and coal dust, so the frequency converter must be sealed in the flameproof shell by means of flameproof shell technology. Ensure that electrical sparks inside the shell do not detonate explosive gases outside the shell. However, the heat dissipation of the converter in the shell seriously affects its safe use, and the condensation effect caused by the change of cold and heat will also cause serious short-circuit harm. In this paper, a flameproof double throttle air conditioning system is proposed to solve the problems of heat dissipation and internal condensation of flameproof inverter. This paper first introduces the working principle of flameproof double throttle air conditioning system. The double throttle air conditioning system adopts the modular design idea, considering the factors such as safety of mine explosion-proof, reasonable airflow organization and simple body structure, etc., the technology of flameproof shell is used. The structure design of double throttle air conditioning system is completed by theoretical calculation and technical verification. Secondly, the individualized ventilation mode is designed in view of the heat point position of the converter in the shell, and the cooling mode is strengthened to achieve the energy saving effect of the designed air conditioning system. According to the refrigeration principle, cooling dehumidification theory and coupling control technology, a suitable flameproof air conditioning unit is designed, and the underground environment is simulated. The experimental results show that the system is stable and the maximum temperature in the flameproof shell is 31.7 鈩，

本文编号：1960768