Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A coal-fired unit primary frequency modulation compound control system and its working method

A composite control, coal-fired unit technology, applied in separation methods, chemical instruments and methods, mechanical equipment, etc., can solve problems such as slow load, achieve fast output, increase output, and facilitate safe and reliable operation.

Active Publication Date: 2022-04-01
JIANGSU FRONTIER ELECTRIC TECH +1
View PDF0 Cites 0 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A coal-fired unit primary frequency modulation compound control system and its working method
  • A coal-fired unit primary frequency modulation compound control system and its working method
  • A coal-fired unit primary frequency modulation compound control system and its working method

Examples

Experimental program
Comparison scheme
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] Figure 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 Figure 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 relative...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a primary frequency modulation composite control system of a coal-fired unit, comprising a condensate regulating valve, an electric aperture type throttle orifice plate, a throttle orifice control device, and an integrated master control device; the electric aperture type throttle orifice plate is installed correspondingly Between the extraction port of the low-pressure cylinder and one or more of the low-pressure heaters, it is used to adjust the flow of low-pressure extraction steam entering one or more of the low-pressure heaters according to the control instructions sent by the throttle orifice control device; when When the power grid frequency fluctuation difference is greater than the preset difference threshold, the integrated master control device simultaneously activates the condensate regulating valve and the throttle orifice control device to adjust the condensate flow and low-pressure extraction flow entering the low-pressure heater respectively until the power grid frequency return to stability. The invention solves the problem of relatively slow load in the existing condensed water throttling technology through the combination of condensed water throttling and low-load steam extraction throttling, and improves the stability and reliability of the heater at the same time.

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com