Relevant statistics show that the electricity consumption of wind turbines in the country accounts for about 10% of the total power generation in the country. Among them, the power consumption of wind turbines used in metal mines accounts for 30% of the total electricity consumption in the country; the electricity consumption of wind turbines used in the steel industry accounts for 20% of the total electricity consumption; the power consumption of wind turbines used in the coal industry accounts for the whole country. 17% of the total electricity used in the coal industry. Therefore, for the fan industry, how to produce more energy-efficient and environmentally-friendly fan products is a problem that needs to be highly valued. The industry believes that energy conservation and environmental protection are the eternal theme of the development of the wind turbine industry. So, where should the wind turbine manufacturer start?
Relevant experts believe that the development of energy-saving fan products must start with product design and start with the operation of the fan.
First of all, in terms of design, by applying the scientific research results of components such as impellers and volutes, and further improving the manufacturing precision, we strive to increase the efficiency of various ventilators by an average of 5% to 10%. At present, the most advanced centrifugal ventilator has a maximum efficiency of 87% or more due to the use of a ternary flow impeller; the highest efficiency of the axial ventilator with high efficiency has reached 92%.
For example, the Shenyang Blower Research Institute developed a 4-71, 4-74 ternary flow impeller centrifugal fan for the replacement of medium and low pressure centrifugal fans in 1992. It is a new energy-efficient product with higher efficiency than the same type of old-fashioned fan. Increase by 4%, the average annual electricity consumption per fan is about 2000 kWh per hour. However, due to the troublesome manufacturing process of the ternary flow blade used in the fan, the manufacturing cost is higher than that of the ordinary blade fan, and the high technology transfer fee of the product makes the manufacturing cost of the whole fan increase, and the user cannot bear it. It is fully promoted throughout the industry.
Second, the use of imported technology to develop high-efficiency energy-saving fans. Through the introduction of technology, the development of energy-saving ventilator products has been vigorously promoted. During the "Eleventh Five-Year Plan" period, wind turbine technology and special-purpose fans should be properly introduced according to the needs of the market to fill the domestic gap.
In addition, whether the fan products are energy-saving or not, it is very important to adjust the shifting mechanism and change the operating conditions. At present, most of the fan shifting mechanisms are relatively backward. Some products use traditional V-belts, worm gears, etc. as speed control devices, and most of them still use regulating door adjustment. For the above reasons, although some fans have higher efficiency (up to 86%), their efficiency is not very high, and some even as low as 30%. With the application of the fluid coupler and the frequency converter in the fan, the operating efficiency of the fan is greatly improved, but the number of applications is extremely limited.
At the same time, the development of energy-saving blowers should be vigorously carried out during the "Eleventh Five-Year Plan" period. In this regard, foreign countries have already taken the lead. For example, Japan has made appropriate improvements to the shape of the flow parts such as the volute and the impeller, effectively preventing the occurrence of eddy currents and flow separation, and its adiabatic efficiency is 5% to 10% higher than that of the original centrifugal blower; Centrifugal blower, each stage is equipped with imported guide vane device, its variable efficiency is up to 82%; multi-stage centrifugal blower made in Japan, after automatic adjustment of imported guide vanes, the energy saving rate is up to 20%; high-speed single-stage centrifugal The blower adopts a high-speed, high-pressure ratio semi-open radial ternary impeller, and its efficiency can be increased by 10%. There is also an exhaust gas turbine at the other end of the blower main shaft, which meets environmental protection requirements and achieves energy saving purposes. . The Roots blower has been equipped with a three-lobe Roots blower, which saves energy and reduces noise.
In the development of centrifugal compressors, more ternary flow impellers should be used to increase the efficiency of the impeller by an average of 2% to 5%. For example, the three large-flow ternary flow impellers for centrifugal pipeline compressors developed by the United States have an impeller efficiency of 94% to 95%. The efficiency of Japan's single-shaft multistage centrifugal compressors is further improved. The high-flow half-opening three-element impeller has a thermal insulation efficiency of 94%. The mode of adjustment should be more driven by industrial steam turbines or gas turbines to change the speed to achieve energy saving.
