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

A technology of ultra-supercritical boilers and screen superheaters, which is applied in control systems, lighting and heating equipment, steam generation, etc., can solve problems such as over-temperature tube explosion and harsh environment, reduce labor intensity, and prevent over-temperature explosion. manage accidents, improve safety and economy

Active Publication Date: 2015-06-24
GUANGDONG ELECTRIC POWER SCI RES INST ENERGY TECH CO LTD
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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 surfaces in the boiler equipment. It is also subject to radiation heat transfer, so the environment it is in is even harsher, and it is easier to cause over-temperature explosion

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...

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Application Information

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Patent Type & Authority Patents(China)
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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