Circulating Fluidized Bed Combustion Method with Supplemental Air Cooling
A technology of circulating fluidized bed and combustion method, which is applied in the field of circulating fluidized bed to achieve the effects of reducing requirements, reducing nitrogen oxide emissions, and reducing costs
Active Publication Date: 2018-10-09
INST OF ENGINEERING THERMOPHYSICS - CHINESE ACAD OF SCI
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[0004] The object of the present invention is to propose a circulating fluidized bed combustion method for supplementary air cooling, which can reduce the deformation of the central cylinder and prolong its service life. In addition, it is hoped that the structure of the circulating fluidized bed combustion device will remain unchanged. Improve combustion efficiency in the case of
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[0038] 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.
[0039] 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 f...
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A circulating fluidized bed combustion method capable of realizing cooling by afterflaming air comprises the following steps: a combustion device is provided; fuel and combustion air are introduced into a combustion chamber of the circulating fluidized bed, so that fuel is enabled to be combusted in the combustion chamber; gas-solid mixtures generated by the combustion chamber of the circulating fluidized bed is enabled to enter a cyclone separator, partial particles in the gas-solid mixtures are separated and returned to the combustion chamber of the circulating fluidized bed through a back-feeder, and flue gas in the gas-solid mixtures enters a center cylinder; and afterflaming air enters the wall of the center cylinder for cooling the center cylinder, and then heated afterflaming air flows out of the center cylinder and enters an outlet flue, so that combustible components in the flue gas are completely combusted in the outlet flue. By adopting the method, the service life of the center cylinder is prolonged and the combustion efficiency of the circulating fluidized bed is improved.
Description
technical field [0001] The invention relates to the technical field of circulating fluidized beds, in particular to a combustion method for circulating fluidized beds with supplemental air cooling. Background technique [0002] 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 prominent problems of energy saving, environmental protection and safe and stable operation, high requirements are also put forward for the design of key components of circulating fluidized bed boilers. The central cylinder, the key component of the circulating fluidized bed cyclone separator, operates in the strong erosion of high-temperature flue gas above 900 ° C, and its service life has always been short. The central cylinder is generally made of heat-resistant steel Cr25Ni20, which will deform after a period of operation, and the manufacturing process is...
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IPC IPC(8): F23C10/10F23C10/26
Inventor 周托吕清刚那永洁王小芳王东宇高鸣
Owner INST OF ENGINEERING THERMOPHYSICS - CHINESE ACAD OF SCI