Circulating pump system pump energy saving technology

Pump energy saving is a very important measure for the sustainable development of society. Circulating pumps are indispensable equipment for social development. The energy saving of circulating pumps is also valued.

Circulating pump energy-saving problems have aroused great attention of people at home and abroad. First of all, the production of circulating pumps is large. Second, the multi-stage pump should be in all sectors of industry and agriculture, such as mine drainage, irrigation and drainage pumps for agriculture, urban water supply pumps, oil and chemical pumps. The most common form of pump driven by a motor. Circulating pump energy saving method is mainly to make the pump unit (pump, prime mover and rotating part) in the highest efficiency operation, making it consume the external input power down to the lowest point. Energy-saving pump to make a comprehensive technology, which involves the pump itself, energy saving, system management and operation of energy-saving and other aspects.

1. Design efficient circulation pump

The loss of circulating pump itself can be divided into hydraulic loss, mechanical loss and volume loss. After the pump structure is selected, it can be considered that mechanical loss and volume loss are basically the same, so the pump itself should focus on energy saving to reduce the hydraulic loss in the pump. The following measures can be taken:

(1) Selection of excellent hydraulic model;

(2) The use of advanced hydraulic design methods;

(3) The traditional design method, CAD / CFD technology and experiment method are combined, and the performance of the pump designed by CFD technology is predicted.

(4) Reasonable selection of materials to increase the service life of wearing parts, improve pump reliability and average life expectancy.

2. Production of high efficiency circulating pump

An efficient circulation pump must be manufactured with a high level of technology. To ensure the design performance of the pump, we must first improve the accuracy of manufacturing manufacturers should strive to improve the casting quality of parts to ensure the accuracy of the size and shape of the correct, to find ways to sabotage the pump flow to improve Flow surface finish, reducing frictional resistance to fluids. Second, reduce the roughness of the overcurrent components to reduce the pump hydraulic losses and improve pump efficiency. Reasonable choice of materials at the gap at the parts, improve anti-bite and wear resistance, appropriate to reduce the gap value, reduce the volume loss.

3. Circulation pump system energy saving

Correct selection of pumps in line with applicable requirements Each pump has a set of performance curves, corresponding to a flow value, you can find the corresponding head, power and efficiency values. Usually we call this group of parameters corresponding to the operating point, the highest point of efficiency is called the best conditions point pump flow - head performance curve and the intersection of pipeline characteristic curve is called the pump operating point . The operating point varies with the flow and head of the pump, and the required head of the line characteristic is constant for a given supply line system. In the actual use of the pump, the operating point of the pump should coincide with the best operating point, or close to the best operating point, so as to keep the pump in the high-efficiency operating area, thus achieving the purpose of saving energy. Pump in the selection process through the more departments, the safety margin to stay bigger, not only caused a lot of waste, and some can not even work properly. Many high-efficiency pumps run away from the optimum operating point, which consumes a lot of energy and is inefficient. Correctly determine the geometry of the pump installation height is to ensure that the pump does not occur under the conditions of design work Cavitation important conditions. In actual work, people only pay attention to the flow, lift, often neglect the pump cavitation performance. Some installers do not quite understand the theoretical performance of the pump, nor do they never calculate the allowable installation height of the pump. Only the past experience is used to determine the installation height of the pump. Some installers also think that the larger the lift of the pump, The higher the installation height; or due to insufficient estimation of resistance loss of the suction pipe system, insufficient temperature fluctuation estimation of the medium and insufficient estimation of the change of the water level in the sump, the pump is operated in a potential cavitation condition and the pump is damaged Faster, or cavitation, can not work. Therefore, to correctly determine the geometric height of circulating pump installation for pump energy saving is of great significance.