Application of superfluids in the energy-saving renovation of water pumps

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Pumps are widely used in various fields of industrial and agricultural production as well as in residential life, and the electrical energy consumed by pump systems each year accounts for over 21% of the country’s total electricity consumption. Water pumps are also essential production equipment in papermaking plants, used for supplying water in the pulping process, for alkali furnace operations, and for coal-fired boilers; they are among the main energy-consuming devices in such plants. Currently, the pump efficiency in papermaking plants is generally low ； The pump set is oversized, and the operation control method is outdated. Most companies still use fixed-speed drive, with the flow rate of water pumps being adjusted primarily through valves. Affected by various factors such as season, climate, and workload, water pumps often operate at low loads or even with a throttling of over 50%. Due to throttling losses and operation outside the efficient range, energy waste is severe. Therefore, developing technologies and methods for energy conservation in enterprise water pumps and improving their operational efficiency is of great significance for enhancing both the economic and social benefits of enterprises. Development trends in energy-saving technologies for water pumps 1. The design technology of water pumps themselves is not highly advanced. At present, the design of water pumps in China relies mainly on traditional methods such as the model substitution approach and the speed coefficient method. To some extent, these design methods are outdated, as they are based on old experiences in water pump design; they do not allow for improvements over previous design levels, nor do they enable breakthroughs in terms of efficiency. Furthermore, the water pump design firms allocate insufficient funds and resources to research and development; their designers lack the motivation and awareness to innovate. As a result, the technical quality of water pump products does not improve, and the technological level of these pumps itself cannot be enhanced, which in turn makes it impossible to achieve energy savings. Furthermore, pump manufacturing companies place excessive emphasis on economic benefits, neglecting the issue of energy conservation in pumps; **there are also no policy supports or financial incentives in this regard, which results in a lack of motivation among these companies to improve pump efficiency and reduce energy consumption. 　　2. Misconceptions about energy savings in water pumps In the past, our understanding of energy savings in water pumps focused on improving various efficiency metrics of these pumps; in fact, this represents a misconception regarding energy savings in water pumps, an incomplete view of the issue. The scope of energy savings we are referring to encompasses not only an efficiency indicator, but also various factors such as the stability of the water pump’s performance, its lifespan, and the savings in materials used. Furthermore, when it comes to the operating environment of water pumps, we also need to carry out energy-saving designs tailored to specific conditions. This includes aspects such as the sealing performance of the pumps, their hydraulic performance, and their resistance to high temperatures; all of these elements need to be designed taking into account different environments and various applications. Therefore, research on energy savings for water pumps is a very complex task, and our understanding of the concept of energy savings should not be one-sided; rather, it requires a comprehensive and holistic perspective. 　　3. Factors related to the users and individuals When purchasing water pumps, users and individuals usually focus on whether the pump meets their needs and whether its price is low, but they pay little attention to the pump’s energy-saving performance metrics. This demand from consumers also dampens the enthusiasm of water pump design and manufacturing firms to innovate in energy-saving technologies. Moreover, a large number of consumers, when choosing water pumps, opt for those with excessive flow and head capacity in order to ensure that their needs can be met. As a result, the actual operating efficiency of such pumps during use is far lower than their maximum efficiency, preventing them from operating within the efficient range. Furthermore, during use, due to lax management and inspection by the operating units, improper operation and maintenance, as well as delayed repairs, water pumps often experience failures, resulting in significant waste of energy. 　　III. Energy-saving technical approaches for water pumps 1. Energy saving in water pumps themselves During the design and manufacturing process of water pumps, those responsible for such work must have an awareness of energy conservation. As manufacturers of water pumps, it is their responsibility to provide consumers with high-efficiency, energy-saving pump products. When designing water pumps, the design agencies should use high-quality hydraulic models and explore scientific and efficient hydraulic design methods. During the design process, reliability tests for the water pumps as well as tests on the materials used in these products should be conducted, in order to improve the efficiency of the water pump products. Pump manufacturers must establish their own corporate standards that are higher than **mechanical standards** during the manufacturing process, and seek every possible way to reduce hydraulic losses. Strict control is exercised over various processes during manufacturing, efforts are made to minimize the roughness of components that experience flow, the gaps are carefully handled by reducing their sizes appropriately, all in order to improve the efficiency of the water pump and achieve energy savings. 　　2. Improving energy efficiency in pump systems 　In addition to focusing on the energy-saving capabilities of pump products themselves, we must also pay attention to the development and research of energy-saving technologies for the entire system. The efficiency of pump operation is closely related to the supporting facilities used as well; in fact, system-level energy-saving technologies are even more important than those related to the pumps themselves. Research on energy-saving technologies for systems should focus on carrying out system engineering design from an energy-saving perspective, so that all components of the system can achieve optimal coordination, and the entire water pump system can operate at its maximum efficiency. In this regard, it mainly involves the connection of water pumps and motors, the design of piping systems, as well as the connection and coordination of related accessories, so that all of them can function at their best, thereby improving the efficiency and service life of the water pump system. 　　3. Energy savings during pump operation The efficiency of the pumps themselves has improved, and the entire pump system has also been designed with energy-saving features; however, this is just one aspect. Another very important aspect lies in the process of pump operation itself. In practice, the inefficient performance of water pumps is often caused by improper use of these pumps. Moreover, the operating environment for water pumps is very complex; different environments require different processing procedures and parameters, and it is necessary to make flexible adjustments to these aspects during use. For example, when adjusting the water pump system, it is important to minimize energy loss; throttling should be used as little as possible. The problem can be addressed by adjusting the angle, speed, or through other methods, in order to ensure that both the motor and the water pump operate efficiently. When installing the water pump impeller, it is necessary to adjust the angle of the rotating impeller according to the requirements of the specific operating environment, and to determine the blade installation angle appropriately, so that the water pump can operate efficiently. Turning adjustment refers to the method of adjusting the performance of a water pump by turning the diameter of its impeller. It is one of the simplest and most convenient energy-saving measures. A basic principle in turning adjustment is that the flow rate, head, and shaft power before and after turning the impeller are proportional to the diameter of the impeller, its square, and its cube before and after the adjustment. One thing to keep in mind when using turning adjustments is that the adjustments must be made within a safe range, and not without any limits. Variable speed adjustment is the most direct and commonly used method of adjustment in daily use; it does not result in any loss of power, as it alters the performance of the water pump by changing its rotation speed. In daily life, the main methods of achieving this include using gearboxes, belt drives, frequency conversion, electric motors, and so on. Among these methods, variable-frequency speed control is the most ideal option; its advantages include high efficiency, stepless speed adjustment, and a wide speed range. However, its drawback in terms of application is the high initial investment required. 　　4. Energy conservation in the use of water pumps by users and individuals In specific operating environments, selecting a suitable pump system is important; meanwhile, users and individuals must also be mindful of energy conservation and implement strict management practices to ensure that water pumps operate in an energy-efficient manner. At the same time, during operation it is necessary to regularly maintain and service the water pump system to keep it in optimal working condition. By carrying out routine inspections, any issues within the water pump system can be identified and repaired, which not only extends the system’s lifespan but also yields significant energy-saving benefits. With the development of modern technology, new design methods as well as advanced casting and processing techniques have been applied in production, all of which significantly improve the efficiency of water pumps and contribute to energy conservation efforts. The problems existing in the current efforts to improve the energy efficiency of water pumps will surely be resolved as awareness rises and technology advances. The prospects for improving the energy efficiency of water pumps are very promising. Ways to enhance the mechanical efficiency of water pumps include: (1) reducing bearing losses; (2) reducing losses in the packing area – selecting appropriate packing based on the pump’s purpose and operating environment, and maintaining the proper tightness of the packing gland; (3) reducing frictional losses inside the pump. These frictional losses include 1) friction between the water flow and the surfaces of the pump body and cover, 2) friction between the water flow and the surfaces of the flow channels on the high- and low-pressure sides of the impeller, 3) friction between the mating surfaces of various rotating components inside the pump. To reduce friction losses for the first two cases, if the surface roughness of the parts is high, it is possible to first polish them and then apply a coating; for this purpose, the Yuke Super Slip Fluid coating should be used depending on the area involved. To prevent localized damage to the surface of the flow channels due to cavitation, it is necessary to remove such damage first before applying the coating. For small areas, welding repairs and polishing can be carried out. Regarding the third point, it is crucial for the mating surfaces of the various rotating components inside the water pump to ensure high quality in both the processing and assembly of these components, so as to achieve an optimal flow pattern and reduce frictional losses within the pump. Qingdao Yukew New Materials Co., Ltd. has been specialized in polymer research for over a decade. It has proposed a theory for energy savings through the use of super-hydrophobic fluids. Under the impact of high-speed flowing fluids, components such as pump casing channels and impeller surfaces are prone to cavitation. Moreover, the rough surface texture of metal castings can significantly increase surface resistance under the action of high-speed water flow, thereby affecting the efficiency of water flow. This loss in efficiency cannot be addressed by traditional energy-saving methods. The superhydrophobic fluid coating is a type of robust fluid ceramic coating that is applied to the flow-through components of pumps at room temperature, thereby smoothing the inner surfaces of the pumps and reducing friction and wear. The smoothness of this coating is 20 times that of polished stainless steel, and the material possesses a high degree of hydrophobicity, which minimizes its adhesion to water surfaces. The surface is less prone to scaling; even after long-term use, it remains as smooth as new. The efficiency of water flow is improved, unnecessary power consumption is significantly reduced, and the motor’s output decreases, thereby achieving energy savings. This method of energy conservation does not conflict with any traditional energy-saving approaches, and it remains effective in pumps that have already been fitted with variable frequency drives or that have undergone machining. After coating, both the flow rate and head capacity of the pump increase significantly, while the power consumption drops markedly. The entire coating process does not involve any structural changes to the pump, and it poses no risks to the pump itself. Its safety factor is the highest among all energy-saving methods. The super-smooth fluid coating possesses the unique flexibility inherent to polymers, which helps to prevent cavitation wear in pumps. A single application of this coating can last for over 5 years