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Combustion device of multifunction tangential firing pulverized coal boiler and control method thereof

A tangential combustion, pulverized coal boiler technology, applied in the control of the combustion device of the multifunctional tangential combustion pulverized coal boiler, and the field of the combustion device of the multifunctional tangential combustion pulverized coal boiler, can solve the problem that the tangential circular combustion pulverized coal combustion equipment cannot meet the Large-scale power station boilers cannot take into account the problems of low nitrogen combustion effect and combustion efficiency, poor adaptability of coal types, etc., to achieve the effects of simple construction, high temperature corrosion elimination, and strong adaptability

Active Publication Date: 2011-10-26
GANSU HONGFA ELECTRIC POWER ENG TECH
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The single-function tangential pulverized coal combustion equipment cannot meet the above-mentioned problems that are common in the operation of large-scale power plant boilers
Over the past ten years, my country has gradually introduced low-NOx combustion technology, which is currently the main source of domestic NOx emission reduction technology. Although many achievements have been made in independent research and development, most of them have not been properly solved to affect the safety and stability of thermal power plants. , the problem of economic operation, and at the same time, the imported burner technology is not only expensive, but also has poor adaptability to coal types, which cannot adapt to my country's national conditions with variable coal types, and cannot take into account the contradiction between low-nitrogen combustion effect and combustion efficiency

Method used

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  • Combustion device of multifunction tangential firing pulverized coal boiler and control method thereof
  • Combustion device of multifunction tangential firing pulverized coal boiler and control method thereof
  • Combustion device of multifunction tangential firing pulverized coal boiler and control method thereof

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Embodiment Construction

[0026] The combustion device and control method of the multifunctional tangentially fired pulverized coal boiler of the present invention will be further described through specific examples below.

[0027] (1) Combustion device of multifunctional tangentially fired pulverized coal boiler

[0028] The layout of the vertical space in the furnace from bottom to top is the stable combustion functional area 1, the reduction functional area 2, the oxidation functional area 3, the flame buffer functional area 4, the reduction functional area 5, the oxidation functional area 6, and the burnout functional area 7 , flame buffer functional area 8 and burnout functional area 9 nine functional areas (see figure 1 ).

[0029] Taking the 300MW unit as an example, the specific division of each functional area is as follows:

[0030] From the inflection point of the cold slag in the furnace, the height of the stable combustion functional area 1 along the furnace is 6-8 meters, the height of ...

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Abstract

The invention provides a combustion device of a multifunction tangential firing pulverized coal boiler. The combustion device is characterized in that a stable combustion functional zone, a reduction functional zone, an oxidation functional zone, a flame buffer functional zone, a reduction functional zone, an oxidation functional zone, a burning-out functional zone, a flame buffer functional zoneand a burning-out functional zone are sequentially arranged in the vertical space in a hearth from bottom to top, wherein the primary air nozzles of the stable combustion functional zone and the reduction functional zone are rectangular, the inner peripheries of the primary air nozzles are of an odd-shaped blunt gear structure, and the middles of the primary air nozzles are toothed blunt bodies. The device can be used for solving the problem of poor flaming coal type adaptability, poor combustion stability, water cooled wall slagging in the hearth, water cooled wall high temperature corrosionand the like in the tangential firing pulverized coal boiler by virtue of reasonable arrangement of each function zone in a furnace combustion device and special structural design of the primary air nozzles as well as the accuracy control on the furnace air or fuel classification. The combustion device provided by the invention has the advantages that the nitric oxide emission concentration in combustion gas is reduced to below 200mg / m<3>, and the boiler efficiency can reach 93% for an over 300MW unit.

Description

technical field [0001] The invention belongs to the technical field of clean coal combustion of power station boilers, and relates to a combustion device of a multifunctional tangentially fired pulverized coal boiler; at the same time, the invention also relates to a control method for a multifunctional tangentially fired pulverized coal boiler combustion device. Background technique [0002] In recent years, with the prominent contradiction between supply and demand of coal and electricity, the actual coal quality of most large-scale power boilers and power plant boilers deviates from the design and calibration coal types and shows a serious deterioration trend. A large amount of low-quality coal is used for combustion in power plant pulverized coal boilers. It is easy to cause problems such as combustion instability, slagging in the furnace, and low combustion efficiency, which pose a serious threat to the safety, stability, and economical operation of the boiler unit. At t...

Claims

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Application Information

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IPC IPC(8): F23C99/00
Inventor 包国举李顺昶赵忠斌张隽逸
Owner GANSU HONGFA ELECTRIC POWER ENG TECH
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