VPSA制氧系统中离心鼓风机变工况调节规律研究

Study on the regulation law of centrifugal blower in VPSA oxygen production system under variable working conditions

为提升离心鼓风机的变工况性能,以某真空变压吸附(VPSA)制氧系统中的离心鼓风机为研究对象,采用数值计算的方法分别对转速、扩压器角度单独调节以及二者联合调节时离心鼓风机的性能变化规律进行了研究。结果表明,相较于固定式,联合调节的工作压比范围扩大42%,可以使离心鼓风机在全压比范围内保持高效稳定运行;通过建立效率与转速、扩压器角度、压比之间的函数模型,采用内点法寻优得出了联合调节的最佳控制方案,为离心鼓风机的高效运行提供了依据。最后为验证寻优结果的可靠性,结合离心鼓风机的实际工作压比变化规律,按照最佳控制方案对试验模型的转速与扩压器角度进行联合调节,经测量可使离心鼓风机保持效率为87%以上持续运行。

In order to improve the performance of the centrifugal blower under variable working conditions,the centrifugal blower in a vacuum pressure swing adsorption(VPSA)oxygen production system was taken as the research object,and the numerical calculation method was used to study the performance change law of the centrifugal blower when the rotating speed and diffuser angle were adjusted separately and jointly.The results show that compared with the fixed type,the working pressure ratio range of the combined regulation is expanded by 42%,and the centrifugal blower can maintain efficient and stable operation within the full pressure ratio range.By establishing the function model between efficiency and rotational speed and between diffuser angle and pressure ratio,the optimal control scheme of joint regulation was obtained by using the interior point method,which provides a basis for the efficient operation of the centrifugal blower.Finally,in order to verify the reliability of the optimization results,combined with the actual working pressure ratio variation law of the centrifugal blower,the rotational speed and diffuser angle of the experimental model were jointly adjusted according to the optimal control scheme.After measurement,the centrifugal blower can maintain an efficiency of over 87%for continuous operation.