Large centrifugal fan
Keyword： Large centrifugal fan
Product Description
Brief Introduction of High Efficiency and Energy Saving Technology for Large Centrifugal Fan
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 spent more than two years on the market research and data collection, took the lead in the sintering blower of iron and steel enterprises, made a comprehensive and systematic experimental research, using three-dimensional flow impeller technology, imported shunt technology and new structural form of sealing technology, the sintering centrifugal blower carried out systematic energy-saving technology innovation, the practical application proved that the energy-saving effect is very obvious, according to the on-site test by Shaanxi Provincial Energy Conservation Monitoring and Inspection Center, the energy consumption per unit output has dropped by 13.73. By comparing with similar products recognized by the industry in Britain, the efficiency can be improved by more than 6%, which can be characterized as the international advanced level.
On this basis, this technology has been applied to the primary dust removal fan for converter steelmaking. According to the statistics of nearly 20 modified and provided complete machines, the energy saving effect is slightly higher than that of sintering blowers. Since then, we have conducted systematic research on cement and coal-fired power generation of similar models and uses, and can be connected to the high-temperature fan and raw material mill exhaust fan at the kiln end and the 1. secondary fan of 300000 kw coal-fired power plant without obstacles.
The development of this energy-saving technology takes into account the design of the whole machine and the energy-saving technical transformation of the stock fan. The transformation of the market stock is carried out as far as possible 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 usually be completed within 72 hours after shutdown.
Characteristics of 1. Energy Saving Technology
1. Centrifugal ternary flow impeller (patented) technology with international advanced level. The core of ternary flow impeller technology is blade technology with spatial curved surface. Compared with traditional arc-shaped blades, it minimizes the impact and resistance loss of gas when flowing through the impeller. Physical comparison is shown in the figure below
2. Large flow inlet diversion (patented) 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.
3. The converter steelmaking dust removal fan only changes the ordinary impeller to a ternary flow impeller structure. The corresponding relevant mouth ring seals need to be matched. The rest of the unit can be left unchanged except for the newly designed unit. If the flow rate needs to be increased, the stator needs to be reprocessed. The modified object is shown in the following figure.
4. The high-temperature fan and cement mill exhaust fan at the kiln end of the cement plant are exactly the same type as the sintering blower, except that the material of the impeller of the high-temperature fan at the kiln end is different. Most of the domestic high-temperature fan uses low-alloy high-temperature material 12Cr1MnV, which has good welding performance and can ensure the welding quality of the impeller. The 1. secondary fan in coal-fired power plants is also of the same type as the sintering blower.
2. has broad adaptability
1, sintering with the main pumping and cooling, converter steelmaking primary dust removal, cement plant raw material grinding and kiln tail and coal-fired power plant 1. secondary fan, update or transformation can keep the fixed components and connecting components unchanged.
2, applicable to the above-mentioned stock of domestic and imported centrifugal fans.
3, the structure of the impeller to meet the single suction and double suction.
4. Weight of rotor ≤ 30000kg, diameter of impeller ≤ 4100mm.
5. Under the premise of motor power, impeller design specification and stator space, the flow rate can be increased by less than 15%. If boost is required, there are many limited conditions and specific parameters need to be calculated.
Matters 3. special instructions
1. As the products of various manufacturers are different, it is better to have complete factory data for the energy-saving transformation of the stock, otherwise complete physical mapping will be carried out to ensure the minimum error during installation.
2. During the transformation, try to ensure that the stator part of the original unit will not be changed. If the structure cannot be met, some parts will need to be trimmed appropriately. If there is a desire to exchange the old and the new, it can be met during the design.
3. When there is a special wear-resistant demand, the bimetallic wear-resistant plate currently used at home and abroad can be selected, and the service life can usually be doubled. At this time, in addition to the doubling of material prices, the process is also relatively complicated. The manufacturing cost of the impeller increases by about 30%, and the overall renovation cost is 15% higher than that of conventional materials.
4. Except for the above-mentioned centrifugal fans in Britain's Howden products, after the system is reformed with energy-saving technology, it can promise to save more than 11% of energy year on year (Howden products can save 6% of energy year on year).
5. When using energy-saving technology for transformation, the old rotor shaft of the original unit can be used, and the transformation cost can be reduced by 10%.
6. Under the premise of simplifying the measurement mode, the contract management mode can be used for stock energy-saving transformation. According to the provisions of the documents of the National Development and Reform Commission, the transformation subject can also enjoy high state financial subsidies after reporting according to the procedures.
4. energy-saving product schedule
A II Series
Sintering blower SJ series
High power fan for cement plant
Centrifugal fan for power plant boiler
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