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

Low-pressure cylinder optimization system for ultra-low load operation of coal-fired unit

A technology for coal-fired units and load operation, applied to mechanical equipment, steam engine devices, engine components, etc., can solve problems such as low-pressure cylinder blowing loss, increase steam intake, ensure safety and reliability, and improve economic efficiency sexual effect

Inactive Publication Date: 2019-08-02
SOUTHEAST UNIV +1
View PDF12 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the low-volume flow problem of the low-pressure cylinder that occurs when the coal-fired unit participates in the deep peak-shaving process of the power grid, the present invention discloses a low-pressure cylinder optimization system and an operation method for the ultra-low-load operation of the coal-fired unit , which solves the problem of blowing loss caused by the low-pressure cylinder due to the small volume flow condition when the unit is under low load

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
  • Low-pressure cylinder optimization system for ultra-low load operation of coal-fired unit
  • Low-pressure cylinder optimization system for ultra-low load operation of coal-fired unit
  • Low-pressure cylinder optimization system for ultra-low load operation of coal-fired unit

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0034] When the unit is running normally with full load, the steam-water circulation process is as follows: figure 1 As shown, the exhaust steam from the medium pressure cylinder 220 enters the first low pressure cylinder 230 and the second low pressure cylinder 240 to perform work. At this time, the first isolation valve 730 , the second isolation valve 820 and the third isolation valve 830 of the isolation valves are all in a fully open state without any throttling effect.

example 2

[0036] When the unit drops from full load to below 50% load, the steam-water circulation process is as follows: figure 2 shown. At this time, the first isolation valve 730 in the steam inlet pipeline of the first low-pressure cylinder 230 is fully closed, the second isolation valve 820 and the third isolation valve 830 in the steam extraction pipeline are both fully closed, and the steam-water circulation of the unit is not closed. Passing through the second low-pressure cylinder 240, the second low-pressure cylinder 240 is isolated, the exhaust steam of the medium-pressure cylinder 220 is merged into the first low-pressure cylinder 230 to expand and work, and the low-pressure cylinder part of the unit adopts single-cylinder operation. When isolating the second low-pressure cylinder 240, the specific operation process for the unit to be put into operation with a single low-pressure cylinder is as follows:

[0037] 1. When the unit load drops below 55%, image 3 Medium low v...

example 3

[0042] When the unit load rises from low load to over 50% load, the steam-water circulation process is changed from figure 2 The process is reconverted to figure 1 shown. At this time, the first isolation valve 730 in the steam intake pipeline of the first low-pressure cylinder 230 is fully open, the isolation valves 820 and 830 in the steam extraction pipeline are both in a fully open state, and the exhaust steam of the medium-pressure cylinder enters the low-pressure cylinder 230 and the low-pressure cylinder 230. Expansion works in the low-pressure cylinder 240, and the low-pressure cylinder part of the unit adopts double low-pressure cylinders to operate. The specific operation process of putting the unit into double low-pressure cylinder operation is as follows:

[0043] 1. When the load of the unit rises to more than 45%, image 3 Among the high value alarm H11, Figure 4 The high value alarm H21 and Figure 5 The high-value alarm H31 in the middle triggers an alar...

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 low-pressure cylinder optimization system for ultra-low load operation of a coal-fired unit. A stop valve and an isolation gate valve are arranged at a steam inlet of a second low-pressure cylinder and used for cutting off steam admission of the low-pressure cylinder, and meanwhile, each stage of steam extraction pipeline of the low-pressure cylinder is provided with an isolation gate valve which isolates through flow of the low-pressure cylinder and a low-pressure heater. The second low-pressure cylinder is isolated by additionally arranging the gate valve, when theunit load is lower than 50%, steam admission of the second low-pressure cylinder and the regenerative steam extraction of the second low-pressure cylinder are isolated, the steam exhausted from a medium-pressure cylinder of a steam turbine unit is combined into a single low-pressure cylinder to do work, and the working condition of air blowing caused by small volume flow operation of the low pressure cylinder is avoided by adding the steam admission flow of the single low-pressure cylinder, the problems of air blowing loss and the like caused by small volume flow of the low-pressure cylinder in low load of the unit are solved, the operating efficiency of the low-pressure cylinder under the low load working condition is improved, and the safety problems of temperature stress, blade flutterand the like caused by large radial temperature difference of the blades of the low-pressure cylinder under the small volume flow working condition are avoided.

Description

technical field [0001] The invention relates to a low-pressure cylinder optimization system for ultra-low-load operation of coal-fired units, and belongs to the technical field of low-load operation of coal-fired units. Background technique [0002] With the continuous development of the economy, the domestic power consumption structure is constantly changing, and the valley-peak difference of power load is getting bigger and bigger. With the continuous increase of the installed capacity of new energy power generation, its intermittent power generation characteristics have caused an increasingly serious impact on the stability of the grid frequency, and the resulting imbalance between supply and demand of power loads still needs to be compensated by coal-fired units. Therefore, domestic traditional coal-fired power generating units are facing the pressure of deep peak regulation. [0003] When the coal-fired unit participates in the deep peak regulation of the power grid, t...

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 Applications(China)
IPC IPC(8): F01D17/10F01D15/10F01D21/00F01K11/02F22D1/32F22D1/50F22G1/00
CPCF01D15/10F01D17/10F01D21/00F01K11/02F22D1/325F22D1/50F22G1/005
Inventor 杨建明凌晨周前徐珂解兵张宁宇
Owner SOUTHEAST UNIV
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