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Anti-coking method and apparatus based on air-staged low-nitrogen combustion reconstruction

A low-nitrogen combustion and air classification technology, applied in the field of coal-fired boiler combustion, can solve the problems of nozzle jet direction deflection, over-temperature tube burst shutdown, power field disturbance, etc. amount of effect

Inactive Publication Date: 2015-12-30
ELECTRIC POWER SCI RES INST OF GUIZHOU POWER GRID CO LTD +1
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Problems solved by technology

When coking occurs at the corner of the furnace, coke blocks will slowly accumulate between the overfired air and the main burner, gradually blocking the nozzle and causing the direction of the nozzle jet to deflect, eventually causing a large area of ​​coking in the boiler, and even causing over-temperature burst tubes to be forced to shut down
In the corner between the burner air of the boiler and the main burner, the soot blower cannot cover and there is no coke hole. When coal with a low ash melting point is used, it is easy to form coking from the top to bottom nozzle. Coking causes the nozzle jet direction to change and the dynamic field is disordered, thus causing a large area of ​​coking in the boiler and shutting down the boiler

Method used

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  • Anti-coking method and apparatus based on air-staged low-nitrogen combustion reconstruction

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Embodiment Construction

[0020] In order to make the object, technical solution and effect of the present invention more clear, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

[0021] The anti-coking device is installed at the four corners of the four-corner tangential boiler, between the overfired air and the main burner, such as figure 1 shown. figure 2 and image 3 It is a schematic diagram of the nozzle of the anti-coking device. There is a small circular hole (jet hole) in front and above the nozzle, with a diameter of 10mm to 20mm. The front corresponds to the direction of the corn...

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Abstract

The invention discloses an anti-coking method and apparatus based on air-staged low-nitrogen combustion reconstruction. The apparatus capable of injecting a plurality of high-air speed low-air quantity jet flows is arranged between a top secondary air nozzle and an over fire air nozzle of a corner-fired boiler. The anti-coking method and apparatus can overcome or greatly alleviate the coking problem of corner areas of the corner-fired boiler and improve economical efficiency and security of the boiler in operation; thus, the anti-coking method and apparatus bring good economic benefits to a thermal power generating unit and has wide popularization significance.

Description

technical field [0001] The invention belongs to the field of combustion of coal-fired boilers, and in particular relates to a device and method for destroying eddy currents and preventing boiler coking. Background technique [0002] my country is the largest producer and consumer of coal. Coal occupies a dominant position in my country's energy structure, and this energy structure will not change in the short term. Therefore, thermal power is still the main power source in my country. To ensure the safe and stable economic operation of thermal power units, It is of great significance to meet the requirements of national economic development and promote the sustainable and healthy development of social economy. In the operation of thermal power units, boiler coking is a common phenomenon that affects the safe, stable and economical operation of the unit, and it is also a long-standing problem. Power plant boilers mainly use coal as fuel, and the combustion products contain a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23C7/02
Inventor 罗小鹏姚斌石践郭少博马帅杨东林陈玉忠刘大猛黄锡兵
Owner ELECTRIC POWER SCI RES INST OF GUIZHOU POWER GRID CO LTD
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