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System and method for monitoring high-temperature corrosive atmosphere of water cooling wall of boiler

A high-temperature corrosion and monitoring system technology, applied in measuring devices, analyzing gas mixtures, instruments, etc., can solve the problems of complex flue gas sampling and analysis systems, valves are easily affected by dust, and low reliability, and meet air tightness requirements The effect of reducing, maintenance-free, and ensuring operational reliability

Active Publication Date: 2016-06-15
INNER MONGOLIA JINGNENG KANGBASHI THERMAL POWER CO LTD
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Problems solved by technology

[0007] In order to solve the excessive complexity of the flue gas sampling and analysis system in the prior art, not only the cost is very high, but also the operation reliability of the whole system is not high, especially the valves, sampling pumps and other defects that are easily affected by dust due to internal moving parts, etc., The invention provides a monitoring system for a high temperature corrosion atmosphere of a boiler water wall and a monitoring method for a high temperature corrosion atmosphere

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  • System and method for monitoring high-temperature corrosive atmosphere of water cooling wall of boiler
  • System and method for monitoring high-temperature corrosive atmosphere of water cooling wall of boiler

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Embodiment 1

[0054] The 660MW ultra-supercritical coal-fired unit boiler adopts the combustion method of front and rear walls opposed to each other. High temperature corrosion is prone to occur in the middle part of both sides of the wall, near the elevation position of the center line of the out-of-fire air, and within 6 meters above it. The water wall tube thinning rate is up to 2mm / Year, seriously threatening the safe operation of the unit. According to the inspection during the maintenance period, the areas prone to high temperature corrosion on both sides of the wall are delineated, the total width is 10 meters, the total height is 12.5 meters, and the walls on both sides are symmetrical. In order to shorten the connecting pipeline and shorten the inspection cycle, each side wall is equipped with a set of boiler water wall high temperature corrosion atmosphere monitoring system of the present invention; each side wall is arranged with 25 flue gas sampling points, the horizontal distanc...

Embodiment 2

[0060] This embodiment is similar to embodiment 1, except that it is installed in a 300MW subcritical coal-fired unit. The boiler adopts a four-corner tangential combustion method. The four walls of the water wall are equipped with flue gas sampling points. Two sets of boilers of the present invention are installed diagonally. Monitoring system for high temperature corrosion atmosphere of water wall.

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Abstract

The invention discloses a system and a method for monitoring high-temperature corrosive atmosphere of a water cooling wall of a boiler.The system for monitoring the high-temperature corrosive atmosphere of the water cooling wall of the boiler comprises a primary flue gas dilution sampling unit, a secondary flue gas dilution sampling unit, a diluted flue gas analyzing unit, a system reverse blowing unit and a compressed air unit.The system and the method for monitoring the high-temperature corrosive atmosphere of the water cooling wall of the boiler have the advantages that components of flue gas can be monitored at the normal temperature, all valves are arranged on compressed air pipelines, accordingly, influence of high temperatures and dust can be ingeniously prevented, long-term continuous and reliable running of the system can be guaranteed, the system and the method have cost merits, and the running safety and economic efficiency of the boiler of a power station can be obviously improved.

Description

Technical field [0001] The invention relates to a boiler water wall high-temperature corrosion atmosphere monitoring system and a high-temperature corrosion atmosphere monitoring method, and belongs to the technical field of power station boilers. Background technique [0002] In recent years, with the development of large-capacity and high-parameter boilers, the temperature of the boiler water wall has increased correspondingly, which has caused the problem of high temperature corrosion of the water wall to become more and more serious. In order to reduce the production of NOx, most power plants currently use staged air supply or low-oxygen combustion. As a result, a reducing atmosphere is easily formed in the area near the water wall, which leads to high temperature corrosion of the water wall. Thinning the water wall to a certain extent will cause the boiler tube burst accident, posing a serious threat to the safe and economic operation of the boiler unit. [0003] Boiler high t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/00
CPCG01N33/0004
Inventor 韦红旗何长征石伟伟
Owner INNER MONGOLIA JINGNENG KANGBASHI THERMAL POWER CO LTD
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