Abstract: In order to solve the problem of narrow space and serious coal dust pollution, a spray and immersion dust collector was proposed. Numerical simulation of gas phase flow for different inlet structures in spray and immersion dust collector was carried out by CFX software, and the results show that the flow field distribution was uneven in the lateral inlet structure, and the standard deviation of gas mass flow of tube outlet was 1.39; the flow field was well-distributed in the top inlet structure, and the standard deviation of gas mass flow of tube outlet was 0.20. In addition, comparative experimental study on the dust collecting properties was done, the results indicate that the emission concentration of top inlet structure was lower than that of the lateral inlet structure under the condition of no spraying, and the emission concentration of top inlet structure was only 3.80 mg/m³, and the collection efficiency was 99.62% when airflow was 1 000 m³/h, height of water level was 0 mm under the condition of spraying.