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

A technology of ultra-supercritical boiler and screen superheater, which is applied in the control of superheat temperature, control system, and steam superheating, etc., can solve the problems of over-temperature pipe explosion and harsh environment, reduce labor intensity, avoid influencing factors, The effect of flow deviation reduction

Active Publication Date: 2014-02-12
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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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

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

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Embodiment Construction

[0021] During the operation of the 1045 MW ultra-supercritical boiler, due to the influence of the physical characteristics of the working fluid, during the conversion process of the dry-wet state of the Bunsen load, the parameters such as steam specific volume fluctuate greatly, causing the flow deviation between the tubes to increase. Specifically, The variable load operation of the 1045 MW ultra-supercritical boiler in the present invention mainly goes through two special stages: one is the transformation process of the boiler from wet operation to dry operation, which is mainly reflected in the subcritical pressure of the working medium in the water-cooled wall tube, The steam-water mixture with a large steam content is converted into dry steam with a certain degree of superheat. During this stage, the steam-water specific volume changes greatly. Due to the uneven flow distribution and the sharp drop in the temperature conductivity of the working medium, it is very easy to c...

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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. Control processing steps of converting a wet sate to a dry state of the boiler and converting the dry state to the wet state of the boiler are executed, so that alternating fluctuation of parameters of the steam specific volume and the like in a dry state-wet state conversion process is smaller, and the flow deviation is reduced. Besides, the processing steps can be controlled through the operation state of the boiler, and controlling is performed before the wet state is converted to the dry state or the dry state is converted to the wet state, so that overtemperature influence factors of the platen superheater of the 1045-megawatt ultra supercritical boiler are avoided, overtemperature tube burst accidents of the platen superheater 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 Co., Ltd. has a single furnace, opposite combustion on the front and rear walls, one intermediate reheating, a d...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F22G5/00F22B35/00
Inventor 李德波徐齐胜
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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