关键词: 小流量, 辐射进料泵, 设计选型, 低介质黏度, BB5型多级离心泵, API非标准泵型, 调节阀控制, 变频调速

Abstract:

Unlike conventional delayed coking, the design of the radiation feed pump in the new delayed coking technology needs to meet operating conditions such as low flow, high temperature and medium pressure, low viscosity, and variable pressure. The design and selection process has gone through two different types of centrifugal pumps, two different types of volumetric pumps, and then to the outlet control valve control scheme(valve control scheme) of small flow multi-stage centrifugal pumps. A beneficial exploration attempt was made on the design and selection of different types of pumps. Finally, the BB5 small flow multi-stage centrifugal pump was selected to be matched with the outlet regulating valve for the split pressure control scheme. After more than three years of industrial application, the pump operates smoothly, meets operating conditions, and all performance indicators meet design requirements. In addition, an alternative scheme using centrifugal pump variable frequency speed regulation was proposed and compared with the valve control scheme in terms of technology and economy. Compared with the valve control scheme, it is estimated that using the variable frequency speed regulation scheme can save a one-time investment of 150,000～180,000 yuan and save operating costs of 60,000 yuan per year.

Key words: small flow, radiation feed pump, design and type selection, low medium viscocity, BB5 multistage pump, non standard API pump, control valve control, variable frequency speed regulation