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排气量是循环机的主要性能参数之一,它表征机器的工作能力。测量循环机的排气量,可以直接判断机器设备的负荷及其工作的完善性。排气量的测定一般均用孔板法或喷嘴法,它要求流体流量不随时间变化,或其变化非常缓慢。化肥厂用循环机采用这种方法测定流量比较困难:首先,为了减小气流的脉动必须在循环机后节流装置前设置一个足够大的缓冲容积,而设置这样大容积的一个高压容器其代价是很昂贵的;其次,在节流装置的前后均要求有足够长的直管度,从现有小化肥厂的管路来看是较难满足这个要求的,第三,GB2624—81“流量测量节流装置”所用节流件（标准孔板和标准喷嘴）规定管道内径必须≥50mm,小化肥厂也不易达到。本文介绍一种间接测量法。
Exhaust volume is one of the main performance parameters of the cycle machine, which characterizes the working ability of the machine. Measuring the discharge capacity of the cycle machine, you can directly determine the load on the machine and equipment and the work of its integrity. Displacement is generally measured using orifice or nozzle method, which requires the fluid flow does not change over time, or its change is very slow. It is more difficult for the fertilizer plant to use this method to measure the flow rate. Firstly, to reduce the pulsation of the air flow, a sufficiently large buffer volume must be provided in front of the throttling device of the recycle machine. At the cost of setting such a large volume of a high-pressure vessel Is very expensive; Second, before and after the throttle device are required to have a long straight pipe from the existing small fertilizer plant pipe is more difficult to meet this requirement, and third, GB2624-81 “flow Metering throttling device ”used throttling pieces (standard orifice and standard nozzle) pipe diameter must be specified ≥ 50mm, small fertilizer plants are not easy to reach. This article describes an indirect measurement method.