Middle header applicable to low-load flexible operation of supercritical boiler

A technology for supercritical boilers and intermediate headers, which is applied in boiler drums/box headers, components of steam boilers, steam boilers, etc., and can solve uneven heat load distribution, water-cooled wall safety issues, and mass flow rate Reduce and other problems, to achieve the effect of reducing the minimum stable operating load

Pending Publication Date: 2018-10-02
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

Especially in the vertically arranged water wall area, the mass flow rate in the tube decreases under low load, coupled with the problem of uneven heat load distribution in the furnace, the problem of safe operation of the water wall is particularly significant
[0004] Therefore, a new type of intermediate header geo

Method used

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  • Middle header applicable to low-load flexible operation of supercritical boiler
  • Middle header applicable to low-load flexible operation of supercritical boiler
  • Middle header applicable to low-load flexible operation of supercritical boiler

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Embodiment Construction

[0021] Different from the geometric structure of the intermediate header of conventional supercritical boilers, the present invention adopts the design method of adding coaxial flute tubes inside the intermediate header, which will be described below in conjunction with the accompanying drawings.

[0022] Such as figure 1 As shown, the vertically downward and radially introduced water-cooled wall intermediate headers currently used in power plants mainly include: header main body 1 (φ219×60mm, length range 10m~12m), introduction pipe 4 (φ38×6.5mm) and branch pipes 2 (φ31.8×5.5mm); the header main body 1 is a thick-walled tubular device arranged horizontally, and the introduction pipes 4 are installed vertically above the pipe wall of the header main body 1 at equal intervals, and the branch pipes 2 Installed horizontally on both sides of the pipe wall of the main body 1 of the header, and arranged in a zigzag pattern; the branch pipes 2 on one side are each in a group, corresp...

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Abstract

The invention discloses a middle header applicable to low-load flexible operation of a supercritical boiler, and belongs to the technical field of general power generation. The middle header comprisesa header body, a thin-wall pipe and a coaxial flute-shaped pipe. For mainly solving the problem that uneven distribution of internal flow of a vertical tube platen is caused by a supercritical boilerwater cooling wall middle header in load flexible operation, the flute-shaped pipe connected with the header body through the coaxial thin-wall pipe is additionally arranged inside the header body toevenly distribute working media. According to the middle header applicable to low-load flexible operation of the supercritical boiler, a flute-shaped flow equilibrating device is used for solving theproblem that when the dryness of an inlet of a low-load water cooling wall middle header deviates from the designed dryness, the flow of the header is not distributed evenly. By using the flow equilibrating device, the lowest stable working load of the supercritical boiler can be reduced to 20% to 30% that of the BMCR working condition, and the safety of the water cooling wall low-load working range is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of conventional power generation, and in particular relates to an intermediate header suitable for the low-load flexible operation of a supercritical boiler. Background technique [0002] With the continuous increase of the proportion of renewable energy such as wind energy and solar energy connected to the grid capacity, coal-fired units are required to participate in grid peak regulation to balance the load changes caused by the intermittent nature of renewable energy. Power grids around the country have successively issued auxiliary service regulations for various coal-fired units to participate in deep peak regulation. From the perspective of foreign development, by the end of 2017, the power generation capacity of renewable energy in Europe has exceeded that of coal-fired units, and the participation of coal-fired units in flexible operation has become an irreversible trend. [0003] Supercritical boil...

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Application Information

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IPC IPC(8): F22B37/22
CPCF22B37/228
Inventor 庞力平易思泽段立强杨勇平
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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