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A low-pressure cylinder optimization system for ultra-low load operation of coal-fired units

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 blast loss, increase steam intake, ensure safety and reliability, and popularize apply simple effects

Inactive Publication Date: 2021-10-01
SOUTHEAST UNIV +1
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  • 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

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  • A low-pressure cylinder optimization system for ultra-low load operation of coal-fired units
  • A low-pressure cylinder optimization system for ultra-low load operation of coal-fired units
  • A low-pressure cylinder optimization system for ultra-low load operation of coal-fired units

Examples

Experimental program
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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...

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Abstract

The invention discloses a low-pressure cylinder optimization system for ultra-low-load operation of a coal-fired unit. A cut-off valve and an isolation gate valve are arranged at the steam inlet of the second low-pressure cylinder to cut off the steam intake of the low-pressure cylinder. Isolation gate valves are arranged on the extraction pipelines at all levels to isolate the flow between the low-pressure cylinder and the low-pressure heater. The present invention isolates the second low-pressure cylinder by adding a gate valve. When the load of the unit is lower than 50%, it isolates the second low-pressure cylinder from entering steam and reheating and extracting steam, and merges the exhaust steam from the medium-pressure cylinder of the steam turbine unit into a single low-pressure cylinder. Working in the cylinder, by increasing the steam intake flow of a single low-pressure cylinder, it avoids the blowing condition caused by the low-volume flow operation of the low-pressure cylinder, and solves the problem of blowing loss caused by the low-pressure cylinder due to the small volume flow when the unit is under low load. , which not only improves the operating efficiency of the low-pressure cylinder under low-load conditions, but also avoids safety problems such as temperature stress and blade flutter caused by large radial temperature differences in the low-pressure cylinder blades under low-volume flow conditions.

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

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Application Information

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Patent Type & Authority Patents(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