摘要： 气力提升装置具有结构简单，运行成本低廉等优点，在水处理领域具有广泛应用。本研究建立了气力提升系统理论模型，分别考察了进气流量、提升立管管径、淹没率和吸口截表面积对管道式气力提升池底吸污装置吸口流速和吸污效率的影响。试验研究了进气流量、提升立管管径、淹没率和吸口截面积等因素对吸污装置吸口流速和吸污效率的影响规律。结果显示：吸口流速和吸污效率都与进气流量和淹没率呈线性增长关系；在管径不变的条件下，吸口流速随着吸口截面积增大而减小，吸污效率增加后趋于稳定。进气流量为6 m⊃3;/h、淹没率为0.778、提升立管管径为50 mm和吸口截表面积为226 mm2的工况条件下，管道式气力提升池底吸污装置可以达到最优性能。本研究为后续装备研发、试验和推广应用提供参考。

关键词: 气力提升, 吸污装置, 吸口流速, 吸污效率

Abstract: The air-lift device has the advantages of simple structure and low operating cost, and is widely used in the field of water treatment. In this paper, a theoretical model of the air-lift system is established, and the effects of the intake airflow, the diameter of the lifting riser, the submergence rate, and the cross-sectional surface area of the suction port on the suction flow rate and the suction efficiency of the sewage suction device at the bottom of the pipeline air-lift tank are respectively investigated. Through experiments, the influence law of intake flow, riser pipe diameter, submerged rate, and suction cross-sectional area on the suction flow rate and suction efficiency of the sewage suction device was studied. The experiment shows that the flow velocity and suction efficiency of the suction port has a linear relationship with the intake flow and the submergence rate; under the condition of constant pipe diameter, the flow velocity of the suction mouth decreases with the increase of the cross-sectional area of the suction mouth, and the suction efficiency tends to be stable after the increase of the suction efficiency. Under the working conditions of the intake flow rate of 6m⊃3;/h, submersion rate of 0.778, lift riser pipe diameter of 50mm, and suction cross-sectional surface area of 226mm2, the pipeline-type pneumatic lift pool bottom sewage suction device can achieve optimal performance. This research also provides theoretical guidance for the follow-up equipment research and development, testing and promotion, and application.

Key words: Air-lift, Sewage suction, Suction flow rate, Suction efficiency