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Energy saving technology of circulating pump system

* 来源: * 作者: * 发表时间: 2019-08-15 1:05:42 * 浏览: 280
Pump energy saving is an important measure for sustainable development. Circulating pump is an indispensable equipment for social development, and energy saving of circulating pump is also highly valued. The problem of energy saving of circulating pump has attracted great attention at home and abroad. First of all, the circulation pump production is very large. Secondly, multistage pumps are used in various fields of industry and agriculture, such as mine drainage, agricultural drainage pump, urban water supply pump, petroleum and chemical pump. The most common driving form of pump is driven by motor. The main energy-saving method of circulating pump is to make the pump unit (pump, prime mover and rotating parts) operate with the highest efficiency, so that the external input power is reduced to the lowest point. The energy saving of the pump realizes the comprehensive technology, including the energy saving of the pump itself, the energy saving of the system and the operation management. 1. Design high efficiency circulating pump. The loss of circulating pump itself can be divided into hydraulic loss, mechanical loss and volume loss. After selecting the pump structure, it can be considered that the mechanical loss and volume loss are basically unchanged. Therefore, the energy saving of the pump itself should focus on reducing the hydraulic loss in the pump. The following measures can be taken: (1) selecting excellent hydraulic model, (2) adopting advanced hydraulic design method, (3) combining traditional design method, CAD / CFD technology and experimental means, using CFD technology to design pump. Performance prediction, (4) reasonable selection of materials, improve the service life of vulnerable parts, improve the reliability and average life of the pump. 2. The production of high-efficiency circulating pump must ensure high-efficiency circulating pump through high-level manufacturing process. In order to ensure the design performance of the pump, it is necessary to improve the accuracy of manufacturing. The manufacturer should strive to improve the casting quality of parts to ensure the accuracy of size and shape. It is necessary to improve the flow path of the pump to improve the flow. The surface finish of the flow part reduces the frictional resistance to the fluid. Secondly, reduce the roughness of the flow passage parts, reduce the hydraulic loss of the pump, and improve the efficiency of the pump. Reasonable selection of parts materials at the gap, improve the anti bite and wear resistance, properly reduce the gap value, reduce the volume loss. 3. For energy saving of circulating pump system, select the pump that meets the applicable requirements correctly. Each pump has a set of performance curve, corresponding to a flow value, and the corresponding head, power and efficiency value can be found. In general, we call this group of parameters as the working point, the corresponding highest efficiency point as the best working point, and the intersection of the pump flow improvement performance curve and the pipeline characteristic curve as the working point of the pump. The working point varies with the flow rate and head of the pump, and in a given water supply pipeline system, the characteristic curve of the pipeline is basically constant. In the selection process, the more departments the pump passes through, the greater the safety margin, which will not only cause a lot of waste, but also some even can not work normally. Many high efficiency pumps operate far from optimal operating conditions, with high energy consumption and low equipment efficiency. The correct determination of the geometric installation height of the pump is an important condition to ensure that the pump will not produce cavitation under the design conditions. In practice, people only pay attention to the flow rate and head, and often ignore the cavitation performance of the pump. Some installers know little about the theoretical performance of the pump. They will never calculate the allowable installation height of the pump. Only past experience is used to determine the pump mounting height. Other installers believe that the lift of the pump is large. Due to the large installation height, or the insufficient estimation of the resistance loss of the suction pipeline system, the insufficient estimation of the medium temperature fluctuation and the insufficient estimation of the liquid level change in the suction tank, the pump has potential cavitation state, which leads to the pump damage. Faster, or cavitation, doesn't work. Therefore, the correct determination of the geometric installation height of the circulating pump is of great significance to the energy saving of the pump.