In the two sessions of 2021, China proposed the goal of carbon peak and carbon neutral industrial development, which makes energy saving and emission reduction become the rigid demand of many industries, especially power generation, cement, steel and other high-energy industries. In the production equipment of these industries, motors and fans are absolute consumers of energy. So what is the technical level and development status of high efficiency centrifugal fan and high efficiency boiler induced draft fan respectively?
First of all, from the motor energy efficiency grade, China is currently implementing the 2012 version of the standard, energy efficiency grade 3 is YE2 YX3 motor, the corresponding IEC international standard for IE2, energy efficiency grade 2 is YE3 motor, the corresponding IEC international standard for IE3, energy efficiency grade 1 is YE4 motor, The corresponding IEC international standard is IE4. Starting from June 2021, the 2020 version of the new NATIONAL standard will be adopted. Then, each energy efficiency grade will become: Energy efficiency grade 2 is YE3 motor, corresponding to IEC international standard IE3; energy efficiency grade 2 is YE4 motor, corresponding to IEC international standard IE4; Energy efficiency grade 1 is YE5 motor, corresponding to IEC international standard IE5. Therefore, the energy efficiency grade is one step higher than IEC international standard.
Secondly, then the efficiency of centrifugal fan or boiler induced draft fan will also rise? The answer is the efficiency under the condition of same tend to rise, but there will be a lot of kinds of actual situation, usually, the efficiency of the backward of the fan blade is 80-90%, forward the efficiency of the fan blade is 65-75%, when the fan rotation speed must be website resistance of different lead to the fan air volume and air pressure changes, the efficiency of the fan will also change, the change range and a high efficiency point, This makes the selection of fan becomes very important, determine pipe network resistance and required fan pressure, so that the fan runs at the highest efficiency point, then the efficiency of the fan is maximized, relatively speaking, the fan is the most energy saving, coupled with the use of higher efficiency of the motor, the efficiency of the fan will naturally improve.
