| Abstract: | Massive dust of exhausted airflow easily diffuses to the industrial square while hoisting shaft used as return shaft in the retrograde ventilation, furthermore there comes certainly the problem of dust scattering and noise exceeding standard. In order to solve the above problem, the coupled technology of dedusting and noise reduction in the airshaft outlet is investigated and the device with the function of Dedusting and noise Reduction (DR) is originated. The device is named as DR diffuser. The DR diffuser comprehensively utilizes mechanisms of inertia-gravity dedusting and absorption-insulation sound. The DR diffuser is applied in Xingdong coal mine, and the tested results show: (1) the resistance of DR diffuser is lower than 60Pa; (2) the noise level reaches to 49.2dB(A); (3) the dedusting efficiency of above 50m is higher than 85%; (4) dynamic pressure recovered from the outlet of main fan is larger than 50Pa. The above measured data illustrates that comprehensive benefit of the DR diffuser is good, and the device is worth of applying in engineering site. |
