Strengthen the energy saving and consumption reduction of centrifugal fan

There are many measures to strengthen the energy conservation and consumption reduction of centrifugal fans, such as promoting the application scope of high-efficiency and energy-saving fans; The inefficient old fans can be transformed and phased out; Try to adopt more economical fan regulation method; Introduce new technologies in the research and development of fans.

（1） Energy saving approach of centrifugal fan

There are two kinds of specific technologies for energy saving and consumption reduction of centrifugal fans. One is to design and transform the quality of products to improve the operation efficiency of fans, so as to reduce energy consumption; The second is to improve the operation efficiency according to the state and parameters of the product in the actual operation process. Specific energy-saving measures mainly include the following two categories.

1. Constant speed unit. For constant speed units, there are many ways to improve the working efficiency of centrifugal fans. For example, replace inefficient fans with efficient centrifugal fans; Replace large impeller with small impeller; Change the installation angle of the moving blade to make the moving blade adjustable; Change the width of fan blades; Change the installation angle of diffuser, etc. For the constant speed centrifugal fan, in the process of energy-saving transformation, the most appropriate method needs to be adopted according to the actual structure of the fan.

2. Variable speed unit. For variable speed units, the specific energy-saving ways are different from constant speed units. The key of this way is to change the speed of the fan, and the main way is variable frequency speed regulation; Electromagnetic speed regulation; Cascade speed regulation; Variable pole logarithmic speed regulation; No commutator, motor speed regulation, etc., hydraulic coupling can be used; Hydraulic speed regulating clutch and other devices to change the speed of the fan, so as to achieve the effect of energy saving.

For example, in the process of using hydraulic coupling to save energy, an example is given to prove the energy consumption. Take the converter fan as an example. In the process of steelmaking production cycle, the converter will not produce a lot of flue gas during charging and tapping, but more flue gas will be produced in the process of oxygen blowing smelting. Therefore, the exhaust process of the fan will change with the change of the process. For example, in the actual operation process, the fifth plant of Shanghai Iron and Steel Group adopts ydt450 speed regulating coupler to control the air volume. The power of the centrifugal fan is 323kw at high speed, while the operating power is only 105kW at low speed. The electric energy that can be saved in a year is 700000 kwh, which is a huge amount.