Abstract
Injection pumps constitute an essential component for many industrial applications. The main focus of this study is to predict the effect of the size of the pipeline on the cross flow injection process. A test-rig was designed, built and equipped with three different pipelines, 1½", ¾" and ½" diameters. Comparison was made under constant line pressure of 40-bar and line flow rate of 5 liter/min, with a fixed injection pump rotational speed of 100 rpm. The main parameter tested was the injection dose capacity at different pump displacements. Cross flow mixing process is also theoretically studied using 3D-CFD analysis to show the injection cross flow behavior for the same geometry and parameters used for experimental test. Results show that increasing the size of the pipeline increases injection pump doses ability. This effect is insignificant at lower injection pump displacements, while the effect of the size of the pipeline becomes dominant when increasing the displacement. By changing the size of the pipeline from ½" to 1½" diameter injection pump dose capacity increases by 3.24% at 100% pump displacement. Selecting larger pipe sizes for injection ports is recommended whenever possible.
Highlights
Injection technology is essential for many industrial processes
The study results show the importance of using the 90o bend after mixing pipe
An electronic regulator with an adjustable Pulse Width Modulation (PWM) controller is used to control the speed of the variable displacement reciprocating injection pump (VDRIP) which is measured using a LASER rotational speed measuring instrument
Summary
The most widely used type is the diaphragm injection pump unit due to its simple and compact low cost design. Diaphragm pumps have many problems related to their diaphragm material and electro-magnetic core. Driving of the injection metering pumps could be hydraulically actuated, air/gas driven, electric/engine or power impelled. In case of a very low injection doses requirement micro injection pumps should be used. The parameters of the micro valveless pump were theoretically and experimentally investigated. Results provide a useful reference for structure optimization of the micro valveless pump driving diaphragm [2]. A developed inexpensive 6-bar flow system was introduced based on a low-cost diaphragm pump [4]. In order to satisfy high pressure injection applications, a piston pump unit should be used. Piston pumps satisfy high volumetric efficiency due to a tight gap space between piston and cylinder [5]
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