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High efficiency and energy saving technology of large centrifugal fan
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China's centrifugal fan technology originated in the 1970 s, the original Ministry of machinery industry organization of the three design and has been used today. In the past ten years, with the continuous emergence of new technologies, new materials and new processes, favorable conditions have been created for comprehensive technological innovation. Our company has spent more than two years to conduct market research and data collection. It is the first to conduct a comprehensive and systematic experimental study on the sintering blowers of iron and steel enterprises. Using the technology of ternary flow impeller, imported shunt technology and new structural sealing technology, we have carried out systematic energy-saving technological innovation on the centrifugal blowers for sintering. The practical application proves that the energy-saving effect is very significant, according to the on-site test by Shaanxi Provincial Energy Conservation Monitoring and Inspection Center, the energy consumption per unit output has decreased by 13.73. Through inquiry and comparison with similar products of British Howden recognized by the industry, the efficiency can also reach more than 6%, which can be characterized as the international advanced level. The technology has also obtained the national invention patent (patent number: ZL 201310357109.6).

On this basis, this technology has been applied to the converter steelmaking primary dust removal fan. After statistics on the energy-saving effect of nearly 100 modified rotors and complete machines, the energy-saving effect is slightly higher than that of sintering blowers. Since then, we have conducted systematic research on similar models used for cement and coal-fired power generation, and can be connected to the kiln tail high-temperature fan and raw material mill exhaust fan, as well as the 1. secondary fan of 300000 KW coal-fired power plant.

The development of this energy-saving technology takes into account both the design of the whole machine and the energy-saving technical transformation of the stock fan. The transformation of the market stock is guaranteed to be carried out under the premise of the same installation size, which can not only save the transformation cost, but also reduce the installation and debugging time, which can be completed within 72 hours after shutdown.

Characteristics of high efficiency and energy saving technology

1. High efficiency and energy saving technology is the centrifugal ternary flow impeller (patent) technology with international advanced level, and its core is the blade technology with space curved surface. Compared with the traditional arc-shaped blades, it minimizes the impact and resistance loss when the gas flows through the impeller. Physical comparison is shown in the figure below

Sheng Tang

2. The high-flow inlet diversion (patented) technology in high-efficiency and energy-saving technology is to add a rectifying grid to the airflow entering the impeller at the turning point of the impeller, so that the airflow can enter the flow channel evenly and orderly for compression. At the same time, it also plays an important role in reducing the scouring of the working surface of the blade by the dusty airflow. Flow analysis and physical objects of the shunt device are shown in the figure below.

Sheng Tang

3. The high-efficiency and energy-saving technology is applied to the converter steelmaking dust removal fan, only the ordinary impeller is changed into a ternary flow impeller structure, and the corresponding relevant mouth ring seals need to be matched. Except for the newly designed unit, the rest parts may not be changed. If the flow rate needs to be increased, only the stator needs to be reprocessed. The modified object is shown in the following figure.

Sheng Tang

4. High-efficiency and energy-saving technology is applied to the high-temperature fan and cement mill exhaust fan at the kiln end of the cement plant. It is exactly the same type as the sintering blower, except that the impeller of the high-temperature fan at the kiln end is made of different materials. In China, low-alloy high-temperature material 12Cr1MnV is mostly used. This material has good welding performance and can ensure the welding quality of the impeller. The 1. secondary fan in coal-fired power plant is the same type, material selection and manufacturing are exactly the same as sintering blowers.

Application examples:

The energy-saving transformation of 96M2 step-by-step sintering system of Hebei Xinji Aosen Iron and Steel Group Company carried out comprehensive technical transformation for two 96M2 step-by-step sintering systems of Xinji Aosen Iron and Steel Company on November 5, 2012, which lasted a total of 20 days.

The air leakage rate of the modified sintering system and sealing system decreased by 20.5 on average after nearly 3 months of continuous operation. Under the same output condition, the active power of the tested motor decreased by 213kw, 9% lower than the original operating current, and the annual power saving was 1.87 million kw/h. After the transformation of SJ9000 sintering blower (main suction), in order to reflect the energy saving effect more intuitively, the rotor is installed on the production line of the same unit that has not been modified in the sintering system for comparative tests. After being put into operation, the motor operating current directly decreases by 65(A), saving 390kw/h of active power (374kw in Jiujiang wire rod site inspection), and the power saving rate is 15.48. If the factor of reducing the active power of the motor and increasing the reactive power is considered, the efficiency of the fan itself is improved by at least 18%; although the cooling fan (SJI15000) has not been put into operation, the design method is exactly the same as that of the main exhaust fan. If the efficiency of the main exhaust fan is estimated at 15%, the electricity can be saved by 225kw/h. In this way, after systematic transformation, the comprehensive power saving is 692kw/h, calculated on the basis of 365 working days of annual production, which can save 7.3244 million kw/h of electric energy, and the investment can be recovered in the second half of the normal situation. More than 15% of the energy saving effect has been obtained, and the success of the renovation has far exceeded our expectations.

Sheng Tang