Variable frequency energy-saving system for movable blade adjustable type induced draft fan

Abstract

The invention particularly discloses a variable frequency energy-saving system for a movable blade adjustable type induced draft fan. By optimizing the operating and regulating mode of the movable blade adjustable type induced draft fan of existing new and in-service thermal power plant boilers and utilizing a special movable blade adjustable type induced draft fan high-voltage high-power frequency converter to drive the movable blade adjustable type induced draft fan, the movable blade adjustable type induced draft fan not only can fulfill the aims of saving energy and reducing consumption, but also can improve integral operation reliability of the system. The invention aims to configure the variable frequency energy-saving system for the movable blade adjustable type induced draft fan between a power supply circuit breaker and an electric motor on the basis that the connection mode of the conventional movable blade adjustable type induced draft fan is unchanged; by switching of power frequency and variable frequency loops, four operating modes of the movable blade adjustable type induced draft fan can be implemented, i.e. after the energy-saving system is utilized, not only can variable frequency speed governing operation of the movable blade adjustable type induced draft fan at a high-efficiency economic working point be implemented, but also the power frequency fixed-speed regulating mode of an original movable blade adjustable type induced draft fan system before transformation is retained.

Description

technical field [0001] The invention relates to the field of electromechanical combination energy-saving speed regulation, in particular to an energy-saving system of a frequency converter of an induced draft fan with adjustable moving blades. Background technique [0002] Most of the boiler induced draft fan systems in service or new thermal power generating units use adjustable blade axial flow fans (such as FAF series, SAF series, etc.), which are mainly achieved by changing the opening of the blades of the adjustable blade fan. Control and change the output air volume and wind pressure of the fan to meet the needs of thermal power plant power generation load adjustment and change. Compared with the traditional centrifugal fan and static blade adjustable induced fan, the movable blade adjustable induced fan can guarantee higher working efficiency within a certain blade opening adjustment range, so people usually think that it is suitable for in-service or new thermal powe...

AI Technical Summary

Problems solved by technology

Based on the above two situations, it can be concluded that in most thermal power plants, the operation mode of the supporting fan with adjustable blades is uneconomical, and it is feasible to implement frequency conversion transformation to save energy and reduce consumption. The potential power saving space is generally 20% or even higher

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