Multi-process circulating fluidized bed boiler capable of feeding fuel in classified mode

Abstract

The invention relates to a multi-process circulating fluidized bed boiler capable of feeding fuel in a classified mode. The multi-process circulating fluidized bed boiler comprises a main combustion chamber (4), an auxiliary combustion chamber (5), a burnout chamber (8), a primary air chamber (1), a first-class feeding device (2), a secondary air opening (3), a second-class feeding device (6) and a third-class air distribution outlet (7), wherein the main combustion chamber (4), the auxiliary combustion chamber (5) and the burnout chamber (8) are sequentially arranged in parallel. The first-class feeding device (2) is arranged on the lower portion of the main combustion chamber (4). The primary air chamber (1) is arranged at the bottom of the main combustion chamber (4). The secondary air opening (3) is formed in the lower portion of the main combustion chamber (4) and located above the first-class feeding device (2). The second-class feeding device (6) is arranged at the top of the auxiliary combustion chamber (5). The third-class air distribution outlet (7) is formed in the upper portion of the auxiliary combustion chamber (5). According to the multi-process circulating fluidized bed boiler, the fuel of different grain diameters is added into different reaction positions of a multi-process circulating fluidized bed, the method is matched with third-class air distribution arrangement, and compared with the prior art, NOx emissions can be reduced obviously.

Description

technical field [0001] The invention relates to the field of boilers, in particular to a multi-flow circulating fluidized bed boiler with graded fuel supply. Background technique [0002] Existing multi-process circulating fluidized bed boilers, such as "a horizontal circulating fluidized bed hot water boiler" (200720190923.3) and "a multi-process circulating fluidized bed boiler" (201010110352.4), generally include The main combustion chamber, the secondary combustion chamber and the burnout chamber, and the separator arranged behind the burnout chamber according to the flue gas direction. The lower half of the main combustion chamber is provided with a feeding port through which the fuel is directly fed into the dense-phase area of ​​the main combustion chamber, and an air chamber is provided at the bottom of the main combustion chamber, the auxiliary combustion chamber and the burnout chamber to provide air distribution. The fuel is fluidized and burned in the main combu...

AI Technical Summary

Problems solved by technology

[0003] Since the existing multi-process circulating fluidized bed boiler only has one feed port in the main combustion chamber, the fuel it puts in can only be added through this feed port, and fuel classification cannot be performed, resulting in insufficient subsequent fuel combustion. sufficient, the NOx content at the furnace outlet is still relatively high

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