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为研究大断面掘进巷道的通风除尘特点,在某大断面模拟巷道对压入式、抽出式及长压短抽式通风系统进行了实验,测量测点的沿程速度,进而分析大断面掘进巷道在不同通风方式下的风流场特征。用Fluent对各实验模型进行了仿真分析,结果表明实验和仿真结果的趋势一致;且由于掘进面太大,抽出式通风在一般抽风量下难以保证掘进面附近风速高于安全风速范围;而长压短抽式通风系统相对压入式通风系统巷道内涡流区小,除尘效率高;因此针对大断面掘进巷道,长压短抽通风系统被优先推荐使用。在此基础上对原长压短抽通风系统进行了数值优化,发现针对该大断面掘进巷道当压抽比为1.2左右、抽风筒高度为2 m左右、压风筒高度为4 m左右时除尘效果最佳。
In order to study the characteristics of ventilation and dust removal in roadway with large cross-section, experiments were carried out in a large cross-section roadway to simulate the push-in, pull-out and long-short pumping ventilation systems to measure the speed along the measuring point. Then, Wind flow field characteristics under different ventilation modes. Fluent was used to simulate the experimental model. The results show that the trend of the experiment and the simulation results are consistent. And because the tunneling surface is too large, it is difficult to ensure that the wind speed near the heading surface is higher than the safe wind speed range under the general exhaust volume. Short pumping ventilation system Relative to the pressure ventilation system in the roadway eddy current area is small, high dust removal efficiency; therefore for large cross-section roadway, short-pumping ventilation system is recommended. On this basis, the numerical simulation of the short-length pumping system with long-short-circuit pressure is carried out. It is found that when the pressure ratio is about 1.2, the height of the exhaust pipe is about 2 m and the height of the pressure pipe is about 4 m, Best effect.