Usually selected explosion-proof centrifugal pump flow, pressure head may and piping requirements, inconsistent, or because the production task, process requirements change, this time require the pump flow adjustment, essence is to change the operating point of the centrifugal pump. The working point of explosion proof centrifugal pump is determined by the characteristic curve of the pump and the characteristic curve of pipeline system, so the change of the characteristic curve of any one can achieve the purpose of flow regulation.
At present, the main flow of the centrifugal pump control valve control, variable speed control, and the pump and, in series, and so on. The principle of regulating a variety of different, in addition to their own advantages and disadvantages, the energy loss caused by are not the same, in order to seek the best, the minimum energy consumption, the energy saving flow regulation must be comprehensive understanding of explosion-proof centrifugal pump flow regulating the relationship between mode and energy consumption.
Explosion proof centrifugal pump in the use of the process, the pump body vibration, causing the pump body and the outlet flange connection surface vibration, bearing wear and tear. Cause there is:
1. When the pump outlet pipe and the flange of the pump port have serious dislocation, there is local stress.
2. Pump outlet pipe bracket supporting inflated phenomenon, did not play a supporting role.
3. Pump outlet check valve is installed in the horizontal direction, in the pump operation on the outlet pipeline resistance to produce vibration, especially in the sudden stop pump water drop phenomenon, the axial force caused by the hydraulic impact is greater.
In view of the existing explosion-proof centrifugal pump of these phenomena, re correction of pump inlet flange and the outlet pipe of the coaxial pipe, to eliminate dislocation, the screw connection only exists in the axial compression force, avoid bearing pipe or pump body gravity, screw and washer to prevent vibration, and the import and export department to increase the horizontal pipe pipe bracket iron pad, reduce vibration and eliminate the false phenomenon of child care; check the export pipe Department moved to the pump outlet pipe vertically after the first elbow pipe installation, the axial force generated in vertical direction when the pump stops suddenly along the pipe bracket to the ground; stop the pump will pump outlet valve closed again stop, in order to reduce the water hammer in pipeline and valve impact, causing damage on pump body.
Through the characteristic curve of explosion proof centrifugal pump and pipeline system, the main methods of the flow regulation of explosion proof centrifugal pump are analyzed, which are the adjustment of the outlet valve, the variable speed regulation of the pump and the series and parallel connection of the pump. With the characteristic graph analysis of exit valve and pump variable speed regulating the energy loss of the two ways, and makes a comparison and pointed out centrifugal pump speed regulating the flow than outlet valve regulating the flow can better save energy, and energy-saving efficiency and flow rate changes in the size of about. In practical application, it should pay attention to the range of variable speed regulation, in order to better application of explosion-proof centrifugal pump speed regulation.
When the single stage explosion-proof centrifugal pump can not meet the conveying task, the explosion-proof centrifugal pump can be used in parallel or in series operation. With two sets of the same type of explosion-proof centrifugal pumps in parallel, although the pressure head changed little, but increase the total transport flow, the overall efficiency of the pump in parallel and single pump efficiency is the same; explosion-proof centrifugal pumps in series increase the total pressure head, flow changed little, the overall efficiency of the tandem pump and single pump efficiency.
In the analysis of energy consumption under different regulation methods, the article is only aimed at the current widely used valve regulation and pump variable speed regulation of the two ways to analyze. Because of explosion-proof centrifugal pump and the series operation is to improve the pressure head or flow, in the chemical field of application is not much, the energy consumption analysis, the method is basically the same.
