Combustion device for reducing emission of nitrogen oxides in circulating fluidized bed
A circulating fluidized bed and nitrogen oxide technology, applied in the field of circulating fluidized bed, can solve the problems of increasing cost, increasing the difficulty of processing and manufacturing, etc., and achieve the effects of prolonging service life, compact structure, and reducing nitrogen oxide emissions
Active Publication Date: 2018-02-23
INST OF ENGINEERING THERMOPHYSICS - CHINESE ACAD OF SCI
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Problems solved by technology
The existing technology proposes a cooled cyclone separator center cylinder, the cooling medium used includes water, steam and air, but most of them use coiled tubes or pipe row splicing to cool the central cylinder, and the cooled medium must be led out of the center It can be reused only after the cylinder, which undoubtedly increases the difficulty of processing and manufacturing, and increases the cost
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[0041] Exemplary embodiments of the present invention will be described in detail below with reference to the accompanying drawings, wherein the same or similar reference numerals represent the same or similar elements. In addition, in the following detailed description, for purposes of explanation, numerous specific details are set forth in order to provide a comprehensive understanding of the embodiments of the present disclosure. It may be evident, however, that one or more embodiments may be practiced without these specific details. In other instances, well-known structures and devices are shown in diagrammatic form to simplify the drawings.
[0042]During the combustion process of fuel in the circulating fluidized bed, the nitrogen oxides (NOx) produced are mainly nitric oxide (NO), and its proportion is as high as 95%. Generally, the nitrogen source of NOx generated by coal combustion can be divided into fuel N and thermal N. The fuel nitrogen comes from the N in the fu...
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A combustion device for reducing the emission of nitrogen oxides in a circulating fluidized bed, comprising: a circulating fluidized bed furnace (1); a cyclone separator (2), and the cyclone separator (2) includes The roughly middle center tube (4) and the outlet flue (5) connected with the center tube; the feeder (3); the tail flue (6); wherein, in the center tube (4) and / or the outlet A supplementary air device is provided on the flue to pass supplementary combustion air into the central tube and / or the outlet flue to completely burn the combustible components in the flue gas. In the present invention, the air for supplementary combustion is fed through the central tube of the cyclone separator and / or the outlet flue, which provides space and time for the full combustion of combustible components in the flue gas, which is beneficial to ensure the combustion efficiency of the boiler, and the air for supplementary combustion is The center cylinder provides cooling, extending the life of the center cylinder.
Description
technical field [0001] The invention relates to the technical field of circulating fluidized beds, in particular to a combustion device for reducing the emission of nitrogen oxides in a circulating fluidized bed. Background technique [0002] With the increasingly stringent control of nitrogen oxide emissions from coal-fired boilers, the use of low-oxygen combustion in the furnace for circulating fluidized bed boilers can effectively control the emission of nitrogen oxides, but it also brings The increase of combustible components reduces the thermal efficiency of the boiler. Therefore, there is a need for a combustion device capable of reducing the emission of nitrogen oxides from a circulating fluidized bed boiler without affecting the thermal efficiency of the boiler. [0003] Circulating fluidized bed boilers have the advantages of high efficiency, environmental protection, and wide adaptability to coal types, and are used more and more widely. With the increasingly pr...
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IPC IPC(8): F23C10/18F23C10/20F23C10/22
Inventor 吕清刚周托王小芳王东宇那永洁包绍麟孙运凯高鸣
Owner INST OF ENGINEERING THERMOPHYSICS - CHINESE ACAD OF SCI