Primary frequency modulation composite control system for coal-fired unit and working method of system

A composite control and coal-fired unit technology, applied in separation methods, chemical instruments and methods, mechanical equipment, etc., can solve problems such as slow load

Active Publication Date: 2021-01-08
JIANGSU FRONTIER ELECTRIC TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a coal-fired unit primary frequency modulation composite control system and its working method, through the combination of condensate throttling and low-load steam extraction throttling, to solve the problem of correspondingly slow load in the existing condensate throttling technology, and at the same time Improved heater stability and reliability

Method used

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  • Primary frequency modulation composite control system for coal-fired unit and working method of system
  • Primary frequency modulation composite control system for coal-fired unit and working method of system
  • Primary frequency modulation composite control system for coal-fired unit and working method of system

Examples

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Effect test

example 1

[0076] When the frequency of the power grid fluctuates, the frequency difference value triggers a high-value alarm, and the throttling system is put into operation. According to the frequency difference of the unit, the condensate flow deviation, the low-pressure heater 350 extraction steam flow deviation and the low-pressure heater 360 extraction steam flow deviation are calculated respectively. value. The condensate flow deviation value is sent to the control logic of the condensate regulating valve of the CDS condensate water system for further calculation; degree command; the deviation of the extraction steam flow of the low-pressure heater 360 is calculated through the flow characteristic curve of the throttle orifice 820 to obtain the opening degree command of the throttle orifice 820; The flow characteristic curve is calculated to obtain the opening instruction of the throttle orifice 830 .

example 2

[0078] When the power grid frequency is stable, the frequency difference value is lower than the insensitive area of ​​the frequency modulation dead zone, the high value alarm value becomes False, the output flow deviation value of the condensate throttling system and the extraction steam throttling system are both 0, and the water level of the deaerator The control and heater extraction control are restored to stability, and the throttle orifice returns to the fully open state without any throttling effect.

example 3

[0080] In the process of putting into operation the primary frequency modulation system integrated control of condensate throttling and low plus extraction throttling, if the cut-off signal of the protection system is triggered, the flow deviation values ​​output by the condensate throttling system and the extraction steam throttling system are equal. is 0, the primary frequency modulation system exits the frequency modulation process, and the throttle orifice returns to the fully open state without any throttling effect.

[0081] Image 6 and Figure 7 Comparing the load response curves of the existing condensate water throttling technology and the composite control system disclosed in the present invention, the response load target value of the unit is set to 27MW. Depend on Image 6 It can be seen that the unit adopts the existing condensate water throttling technology, and the actual value of the load response at 60 seconds is 24.8MW, and the response speed is relatively...

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Abstract

The invention discloses a primary frequency modulation composite control system for a coal-fired unit. The system comprises a condensed water regulating valve, an electric aperture type throttling orifice plate, a throttling orifice plate control device and an integrated master control device, wherein the electric aperture type throttling orifice plate is correspondingly installed between a steamextraction opening of a low-pressure cylinder and one or more low-pressure heaters and is used for regulating the low-pressure steam extraction flow entering one or more low-pressure heaters accordingto a control instruction sent by the throttling orifice plate control device; and when the difference value of power grid frequency fluctuations is greater than a preset difference value threshold, the integrated master control device starts the condensed water regulating valve and the throttling orifice plate control device simultaneously, and the condensed water flow and the low-pressure steamextraction flow which enter the low-pressure heaters are regulated respectively until the power grid frequency returns to be stable. Through the combination of condensed water throttling and low-pressure steam extraction throttling, the problem that loading in an existing condensed water throttling technology is correspondingly slow is solved, and meanwhile the stability and reliability of the heaters are improved.

Description

technical field [0001] The invention relates to the technical field of primary frequency modulation control of coal-fired units, in particular to a composite control system for primary frequency modulation of coal-fired units and a working method thereof. Background technique [0002] Grid frequency is one of the three major indicators of power quality, and maintaining the stability of grid frequency is an important task for the stability of power system operation. With the continuous development of society, the pollutant discharge produced by traditional thermal power generation has a serious impact on the environment, and the instability of new energy power generation technology has brought new challenges to the stability of power grid frequency. , thermal power generating units must participate more deeply in the primary frequency regulation of the power grid. [0003] At present, domestic large-scale thermal power generating units all adopt regenerative heating system, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F28B11/00F28B9/08F28B9/10F22D1/50F01K13/02
CPCF28B11/00F28B9/08F28B9/10F22D1/50F01K13/02
Inventor 王骏杨建明凌晨张天海张泰岩史毅越汤可怡
Owner JIANGSU FRONTIER ELECTRIC TECH
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