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A variable frequency energy-saving system for induced draft fans with adjustable moving blades

An energy-saving system and induced draft fan technology, which is applied in the direction of machines/engines, mechanical equipment, non-variable pumps, etc., can solve the problems of uneconomical operation mode of the induced draft fan with adjustable rotor blades, and achieve simple implementation of the control method and improve safety High reliability and versatility

Active Publication Date: 2017-06-13
DONGFANG HITACHI CHENGDU ELECTRICAL CONTROL EQUIP CO LTD
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  • Description
  • Claims
  • Application Information

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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  • A variable frequency energy-saving system for induced draft fans with adjustable moving blades

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Embodiment Construction

[0027] A frequency conversion energy-saving system of an induced draft fan with adjustable moving blades according to the present invention will be further described below in conjunction with the accompanying drawings.

[0028] Depend on figure 1 As shown, the present invention installs a frequency conversion energy-saving system for an induced draft fan with adjustable moving blades between the power circuit breaker and the motor, and makes the fan have four operating modes by switching between power frequency and frequency conversion. The first mode of operation is power frequency constant speed input At this time, through the power frequency bypass system of the energy-saving system, the blade opening of the adjustable blade fan is used to control the output air volume of the fan to meet the system operation requirements; the second method is to output the inverter at a fixed frequency. , the control of the output air volume of the induced draft fan is achieved by adjusting...

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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 for 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 pow...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F04D27/02
CPCF04D27/00F04D27/0246F04D27/0261
Inventor 马劲松唐俊蒋国正陈功
Owner DONGFANG HITACHI CHENGDU ELECTRICAL CONTROL EQUIP CO LTD
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