独头巷道脉动式通风模拟试验研究

发布时间：2018-02-16 17:42

本文关键词： 独头巷道脉动式通风脉动周期占空比通风效果节约能源　出处：《昆明理工大学》2013年硕士论文　论文类型：学位论文

【摘要】：在巷道掘进和回采时期,通常要对独头巷道进行掘进,掘进过程中需进行大量爆破作业,爆破能加快生产、提高生产效率,同时也给独头巷道掘进工作带来许多危害,危害不仅来源于爆破后产生的有毒有害气体等的产生,还包括冲击波、爆破飞石等直接或间接的给采掘工作带来的危害,其中对通风用风筒设备的危害较大,冲击波和爆破飞石有可能损坏爆区附近的通风设备,倘若通风设备被损坏,将在安全和生产方面对企业产生威胁。地下独头巷道掘进工作中,爆破烟尘的高效排出一直是一个难题,论文针对局部通风风筒不能近距离接近爆破工作面,从而导致通风排烟效率低的问题,提出采用“脉动通风”的方式,提高通风排烟效率。本人在实验室建立模拟试验,运用脉动式给风方式通风,该给风方法实则就是通过控制变化风机的风速,使风机连续通风一段时间后关闭,关闭一定时间后又再次开启,让巷道中风流的能量产生失衡,从而引起流体微团产生扰动,使烟雾与周围空气混合,并在风机停止供风时,使烟雾依靠自身的扩散作用移动到风流有效区内,便于风机再次开启时的通风排烟。本文通过在实验室建立模型巷道进行试验,分析和对比恒定通风和脉动通风的作用效果,得到脉动通风条件下,各参数共同作用下的较优脉动周期和占空比。并通过实验室模拟试验及试验数据分析,得出了“脉动通风”的有效性结论,同时脉动式通风方式还能在一定程度上提高风机效率、减少通风能耗,为企业提高生产效率、节约能源、降低生产成本,提供新的思路。
[Abstract]:In the period of roadway excavation and mining, it is usually necessary to excavate the single-headed roadway. During the excavation process, a large number of blasting operations are required. Blasting can speed up production and improve the production efficiency, and at the same time, it also brings a lot of harm to the single-headed roadway excavation. The harm not only comes from the production of poisonous and harmful gases after blasting, but also includes the harm of blast wave, blasting flying stone and other directly or indirectly to the excavation work, among which the harm to the ventilating tuyere equipment is great. Shock waves and blasting flying stones are likely to damage ventilation equipment near the blast zone, which could pose a threat to the enterprise in terms of safety and production if the ventilation equipment is damaged. In the excavation of underground single-headed roadway, the efficient discharge of blasting smoke dust is always a difficult problem. The paper aims at the problem that local ventilation tuyere can not approach the blasting face at close distance, which leads to the low efficiency of ventilation and exhaust smoke. This paper puts forward the method of "pulsating ventilation" to improve the efficiency of ventilation and exhaust smoke. I set up a simulation test in the laboratory and use the pulsating air supply method to ventilation. The method of air supply is to control the wind speed of the fan by changing the wind speed. The fan is ventilated continuously for a period of time, then closed for a certain time and then opened again, which causes the energy imbalance of the air flow in the roadway, thus causing disturbance of the fluid micromass, mixing the smoke with the surrounding air, and when the fan stops supplying the air, The smoke can be moved to the effective area of air flow by its own diffusion, which is convenient for ventilating and exhausting when the fan is opened again. This paper analyses and compares the effect of constant ventilation and pulsating ventilation by setting up model roadway in laboratory, and obtains the effect of pulsating ventilation. The optimal pulsation period and duty cycle under the combined action of various parameters are obtained. The validity of "pulsating ventilation" is obtained through the laboratory simulation test and the analysis of test data. At the same time, pulsating ventilation can improve fan efficiency to a certain extent, reduce ventilation energy consumption, and provide new ideas for enterprises to improve production efficiency, save energy, reduce production costs and provide new ideas.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TD724

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