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Temperature adjustment system for boiler of ultra-supercritical secondary reheating unit

A double reheating and ultra-supercritical technology, applied in superheating temperature control, steam superheating, lighting and heating equipment, etc., can solve the complex layout of the heating surface of the boiler, the complexity and difficulty of boiler steam temperature control, etc. problems, to achieve the effect of saving operation and maintenance costs, reducing initial investment, and avoiding wear and tear problems

Inactive Publication Date: 2021-05-14
大唐郓城发电有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, at present, the boiler of the double reheat unit adds a second reheat cycle, the heating surface layout of the boiler is more complicated, and the complexity and difficulty of boiler steam temperature control also increase accordingly

Method used

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  • Temperature adjustment system for boiler of ultra-supercritical secondary reheating unit
  • Temperature adjustment system for boiler of ultra-supercritical secondary reheating unit
  • Temperature adjustment system for boiler of ultra-supercritical secondary reheating unit

Examples

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Effect test

Embodiment 1

[0028] see Figure 1-4 , The present invention provides a technical solution: an ultra-supercritical double reheat unit boiler temperature adjustment system, comprising: a double reheat boiler 10 and a boiler tail 20 .

[0029] Wherein, the interior of the boiler tail 20 is divided into a front flue 21, a middle flue 22 and a rear flue 23 by a wall, and the middle flue 22 is arranged between the front flue 21 and the rear flue 23, the front flue A primary low-temperature reheater 24 is fixedly installed inside the flue 21 , a secondary low-temperature reheater 25 is fixedly installed inside the middle flue 22 , and a low-temperature superheater 26 is fixedly installed inside the rear flue 23 .

[0030] Wherein, the boiler tail 20 is fixedly installed at the tail of the double reheat boiler 10 .

[0031] Wherein, a first flue gas regulating baffle 27 is fixedly installed at the inner tail end of the front flue 21 , a second flue gas regulating baffle 28 is fixedly installed at...

Embodiment 2

[0042] see Figure 1-4 , The present invention provides a technical solution: an ultra-supercritical double reheat unit boiler temperature adjustment system, comprising: a double reheat boiler 10 and a boiler tail 20 .

[0043] Wherein, the interior of the boiler tail 20 is divided into a front flue 21, a middle flue 22 and a rear flue 23 by a wall, and the middle flue 22 is arranged between the front flue 21 and the rear flue 23, the front flue A primary low-temperature reheater 24 is fixedly installed inside the flue 21 , a secondary low-temperature reheater 25 is fixedly installed inside the middle flue 22 , and a low-temperature superheater 26 is fixedly installed inside the rear flue 23 .

[0044] Wherein, the boiler tail 20 is fixedly installed at the tail of the double reheat boiler 10 .

[0045] Wherein, a first flue gas regulating baffle 27 is fixedly installed at the inner tail end of the front flue 21 , a second flue gas regulating baffle 28 is fixedly installed at...

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Abstract

The invention discloses a temperature adjustment system for a boiler of an ultra-supercritical secondary reheating unit. The temperature adjustment system for the boiler of the ultra-supercritical secondary reheating unit comprises the secondary reheating boiler, and a boiler tail, wherein the interior of the boiler tail is divided into a front flue, a middle flue and a rear flue through enclosure walls, the middle flue is arranged between the front flue and the rear flue, and a primary low-temperature reheater is fixedly installed in the front flue. According to the invention, the boiler tail is divided into the three flues, flue gas flow distribution is carried out by enabling the outlets of the three flues to be parallel to flue gas adjusting baffles for adjustment so as to carry out heat distribution among the three flues, so that a rated steam temperature is guaranteed to be reached within a certain load range, and meanwhile, fan allowance during a low load is used for ejecting flue gas for recirculation, and as a standby means for low-load temperature adjustment, a recirculation fan does not need to be added, so that the system is relatively simple, the initial investment is reduced, the problem of abrasion caused by high-dust-content flue gas when the recirculation fan is adopted is solved, and the operation and maintenance cost is greatly saved.

Description

technical field [0001] The invention relates to the technical field of a double reheat unit, in particular to an ultra-supercritical double reheat unit boiler temperature adjustment system. Background technique [0002] The reheat steam temperature is one of the important parameters to characterize the operating conditions of the boiler. If the steam temperature is too high, the creep speed of the heating surface of the boiler and the metal of the steam pipe will be accelerated, which will affect the service life of the boiler; The humidity of the steam is too high, which causes the erosion of the last stage blade of the steam turbine to intensify. The reheat steam temperature object has the characteristics of large delay and large inertia, and there are many factors that affect the change of reheat steam temperature, such as unit load change, coal quality change, desuperheating water volume, coking on the heating surface, air-to-coal ratio, and combustion conditions And t...

Claims

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Application Information

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IPC IPC(8): F22G5/12
CPCF22G5/12
Inventor 于海义王海旭李铭
Owner 大唐郓城发电有限公司
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