With the continuous improvement and development of agricultural modernization, pumping station engineering is an important measure and means to solve engineering water shortage. As an important part of pumping station engineering, the quality of its construction directly affects the quality of pumping station engineering. At the same time, with the concept of energy conservation in society, how to do a better job in energy-saving design of electromechanical pumping station has become a very important research field in this field. This paper mainly expounds the significance of energy-saving design of electromechanical pumping station engineering, and makes some research on the optimal operation of electromechanical energy-saving design of pumping station engineering, aiming to provide some valuable references for further improving the level of electromechanical energy-saving design of pumping station engineering .
First, pumping station electromechanical energy-saving design significance
Since the 21st century, with the development of science and technology, the electrical design of pumping stations has been gradually updated with the trend of the times, and the old products have gradually been eliminated. In the introduction of advanced products at the same time, the scientific design and selection as a new direction of the electrical design of the pumping station, in addition to select a new type of electrical design, but also try to choose the most suitable design. If you only pay attention to the introduction of new products and ignore the reliability of the pumping station operation, still can not be economically reasonable, if only pay attention to their effectiveness, you may not be able to do energy saving. Therefore, the requirements for electrical design are also getting higher and higher, and the direction of design is becoming economical, fast and energy-saving.
How to improve the level of energy-saving design of electromechanical pumping station engineering, reduce unnecessary energy loss, economic and energy-saving, so as to bring long-term benefits for economic development and improvement of people's living standards, to save energy, protect the environment and reduce the pump Station construction and operation costs, to promote the long-term and healthy development of water conservancy projects, to achieve the optimal use of energy and other aspects of great significance. Therefore, according to the electromechanical operation in the pumping station project, promoting the application of energy-saving design and reducing the consumption in the electromechanical design of pumping station engineering are the inevitable ways for the future development of water conservancy projects such as pumping stations.
Second, pumping station water machine design of energy-saving points
Pump is the core equipment of the pump station. The selection of the pump is reasonable. It is very important to the efficiency of the pump and the effect of energy saving. Therefore, it should be treated with caution and carefully studied.
1, Reasonable to determine the pump station functions
Design pumping station should be in-depth study of hydrology, planning information, according to local conditions, try to make full use of self-draining, self-irrigation of the natural conditions in order to avoid pumping station pumping, pumping irrigation time, fundamentally to lay the foundation for energy conservation.
2, make full use of and analysis of water conservancy planning parameters
Realistic to determine the various characteristics of pump head lift, especially the highest head and the average lift, thus providing a reliable basis for the selection of the pump to fundamentally avoid the pump motor "Mara" phenomenon, to avoid the pump The average lift conditions (the longest running time) low efficiency and other phenomena.
3, a reasonable choice of pump
Pump selection should be based on the various characteristics of the head has been determined and planning the flow requirements, as far as possible to choose domestic manufacturing, installation of mature technology, the use of experienced, pump structure (including transmission, blade adjustment, etc.) simple and reliable operation, Superior performance, the average head lift pump efficiency, so as to pump operation, maintenance, energy saving to create good conditions.
4, transform into and out of the pool, reduce the intake and outlet head loss
For energy-saving equipment, must be reasonable to determine the specific size and shape of the inlet and outlet, because the unreasonable design will increase the head loss of equipment, but also lead to backflow, vortex, detached wall and other adverse hydraulic phenomena, and ultimately Deterioration of the water pump conditions, reducing pump efficiency.
When the water source conditions change, the minimum submergence depth of the suction inlet of the pump in the inflow pool will often become smaller, which will induce swirl. The influent conditions can be improved by appropriately reducing the floor height of the inflow pool and lowering the installation height of the pump. The water head loss of the spigot is related to the outlet form of the spout and the form and size of the spigot. The free outlet way of the spout above the surface of the spout should be avoided as much as possible. This method will significantly increase the head loss and should instead be submerged . In addition, the use of lateral water as possible to avoid the impact of water flow pool wall, the reflected wave generated at this time will increase the working lift pump.
Third, the energy-saving design of the pumping station points
1, motor and transformer energy saving
In the energy consumption of the electrical part of the pumping station project, motor and transformer energy consumption accounted for a very high percentage, so it is necessary for the motor and transformer energy-saving design.
The energy-saving design of the motor, the specific can be divided into the following three aspects for discussion: (1) to choose a motor with energy-saving features. If you can compare different motors in the pumping station application efficiency, choose the most efficient motor. In general, when the motor capacity requirements of 800 kilowatts or more should choose synchronous motor, and when the capacity requirements of 800 kilowatts below the appropriate choice of asynchronous motor. (2) to control the motor running in the pumping station project, with particular attention to motor power control. After practice research shows that the motor power is generally controlled at 75% to 100%, the highest operating efficiency, this time can greatly save the energy consumption of the motor running process. (3) To try to adopt a scientific and safe way to start the motor. Traditional start-up methods tend to increase the instantaneous current, which may lead to excessive power consumption, it should try to choose a scientific and safe motor start-up method, such as the direct start or step-down start can be used.
The energy-saving design of transformers, the first to be used when pumping the main transformer and life of the transformer used to distinguish. For example, one or two main transformers may be installed in the pump station to ensure the power supply of the pump station while the pump station is powered by other small transformers while the pump station is not pumping water. Second, to make the choice of transformer capacity. In ensuring that the transformer can meet the pump station work requirements under the premise of its load rate should be controlled at about 0.8, the practice studies have shown that the transformer load control between 0.75-0.85, the highest efficiency, that is, the best energy-saving benefits.
2, the line energy saving
In the electromechanical energy-saving design of pumping stations, the circuit system has great potential for energy saving and should be taken seriously as an important control content. Specifically, the circuit energy-saving design can be divided into the following three aspects: (1) Select the copper wire cable to reduce the resistivity of the electromechanical operation of the pumping station; (2) Control the length of the cable and shorten the cable room Of the distance, such as wiring according to wiring reasonable layout of the various electromechanical devices, and thus the line length between devices to be controlled in order to minimize the energy consumption of the operation of the line; (3) including the resistance of the circuit performance, including Optimization, without affecting the actual application of the pumping station under the premise, as far as possible through the optimization of the circuit to reduce its power consumption.
3, for energy saving
In the electromechanical part of the pumping station project, the power supply and distribution system has a very important relationship with its overall energy saving level. If the power supply and distribution design is reasonable, it can greatly reduce the energy consumption of pumping station operation, thus achieving the purpose of energy saving. Specifically, the energy-saving design of pumping station power distribution system should be combined with the actual situation of the electromechanical operation of the pumping station, do the following three aspects of work: (1) optimize the load level, select the transformer to meet the capacity standards, and in accordance with the transformer (2) According to the scale of pumping stations, set the matching voltage, and design the corresponding equipment according to the level of the power supply voltage, so as to improve the power supply efficiency of the pumping station; To achieve the purpose of optimizing energy efficiency. (3) Reduce the power consumption by controlling the power distribution series to ensure that the power supply system operates within the specified numerical range and improve the energy-saving level of the power supply system.
4, automatic energy saving
Automation control is the trend of energy-saving design and development of mechanical and electrical engineering, mechanical and electrical pumping station project is no exception. Through the introduction of automatic control technology, on the one hand, it can strengthen the monitoring of the operation of the electromechanical part of the pump station project to ensure the reliability of the operation of the mechanical and electrical equipment of the pump station; on the other hand, the electromechanical operating parameters can be adjusted according to the actual work requirements of the pump station to ensure Electromechanical system is always running in an efficient and low consumption of working conditions, in order to fully reflect the pump station engineering and electrical energy-saving intelligent advantage.
Fourth, concluding remarks
In recent years, although our country has gradually realized the importance of energy-saving design of electromechanical pumping station, also studied, proposed and implemented some energy-saving technical measures, but the overall effect is not ideal, and the energy consumption of pumping station is too large. Did not get a significant improvement. Therefore, it is also necessary to conduct a more in-depth study on the energy-saving design of the electromechanical part of the pumping station engineering, and on this basis, to optimize the mechanical and electrical part of the pumping station and make an all-round reformation.