Tube wall overtemperature control method for platen superheater in 1045-megawatt ultra supercritical boiler

A technology for ultra-supercritical boilers and panel superheaters, applied in control systems, lighting and heating equipment, steam generation, etc., can solve problems such as over-temperature explosions and harsh environments, reduce labor intensity, and prevent over-temperature explosions The effect of managing accidents and improving safety and economy

Active Publication Date: 2014-02-12
GUANGDONG ELECTRIC POWER SCI RES INST ENERGY TECH CO LTD
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  • Summary
  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

In the actual operation process, the panel superheater, which is a key component of the 1045 MW ultra-supercritical boiler, is one of the most important high-temperature heating

Method used

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  • Tube wall overtemperature control method for platen superheater in 1045-megawatt ultra supercritical boiler
  • Tube wall overtemperature control method for platen superheater in 1045-megawatt ultra supercritical boiler

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Embodiment Construction

[0018] The present invention can make use of statistics on the overtemperature of the tube wall of the panel superheater in a 1045 megawatt ultra-supercritical boiler, and then perform corresponding overtemperature control. The specific overtemperature statistics can refer to the following table 1:

[0019] Table 1 Statistics of tube wall overheating of panel superheater

[0020]

[0021] Generally, the low load mentioned in the boiler refers to the low load which is lower than 30% of the maximum load. From the above table 1, it can be seen that the overtemperature of the tube wall of the panel superheater in the 1045 MW ultra-supercritical boiler basically occurs at In the load section before and after the dry state of the low-load boiler changes from the dry state to the wet state, and from the wet state to the dry state. In addition, the over-temperature parts are basically concentrated on the fifth screen or the 17th screen. The temperature deviation of the tube wall is...

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Abstract

The invention discloses a tube wall overtemperature control method for a platen superheater in a 1045-megawatt ultra supercritical boiler. At a low-load stage of 200-350 megawatts of the 1045-megawatt ultra supercritical boiler, the total air volume of the boiler is controlled to be more than 1600 tons per hour, and the oxygen quantity is 7%-9%; the regulation lead of desuperheating water is set, and when first-level desuperheating water automatic control doesn't meet the requirement, a manual mode is switched to, and controlling is performed; when the boiler operates in a low-load section, on the premise that the superheat degree is smaller than 10 DEG C after first-level temperature reduction, the first-level desuperheating water quantity is increased, and the outlet steam temperature of the platen superheater is controlled to be within 550 DEG C; and by means of control processing of an ash gun at the bottom of a horizontal flue and control processing of the operation state of the boiler, overtemperature tube burst accidents of the 1045-megawatt ultra supercritical boiler can be effectively prevented, the labor intensity of operation staff is reduced, and the safety and the economy of unit operation are improved.

Description

technical field [0001] The invention relates to the technical field of 1045 megawatt (MW) ultra-supercritical boilers, and more specifically, the invention relates to a method for controlling overtemperature of the tube wall of a panel superheater of a 1045 megawatt ultra-supercritical boiler. Background technique [0002] Ultra-supercritical units are relatively mature in technology, and the technological progress of the new generation of ultra-supercritical units is very obvious. Large-capacity ultra-supercritical boilers also have good start-up operation and peak-shaving performance, and can meet the peak-shaving requirements of the grid load. At present, 1045 MW ultra-supercritical boilers have been used in power plants. For example, Dongfang Boiler (Group) Co., Ltd. The DG3033 / 26.15-II2 coal-fired DC furnace with ultra-supercritical parameters produced by the company has a single furnace, opposite combustion on the front and rear walls, one intermediate reheating, doubl...

Claims

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Application Information

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IPC IPC(8): F22B35/00
Inventor 李德波徐齐胜
Owner GUANGDONG ELECTRIC POWER SCI RES INST ENERGY TECH CO LTD
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