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Circulating fluidized bed boiler with independent double flue

A circulating fluidized bed and double flue technology, which is applied in the direction of fluidized bed combustion equipment, fuel burned in melting state, combustion type, etc., can solve problems such as uneven gas-solid flow, reduce the risk of deformation and explosion, and reduce the Emission control cost, effect of ensuring operation safety

Active Publication Date: 2020-01-21
INST OF ENGINEERING THERMOPHYSICS - CHINESE ACAD OF SCI
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Problems solved by technology

[0006] The purpose of the present invention is to provide a circulating fluidized bed boiler with independent double flue to solve the problem of uneven gas-solid flow caused by different flue structure layouts at the outlets of multiple cyclone separators. The structural arrangement can effectively reduce the metal connecting pipes between the high-temperature grade and the low-temperature grade, and achieve the purpose of reducing the manufacturing cost of the boiler

Method used

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  • Circulating fluidized bed boiler with independent double flue
  • Circulating fluidized bed boiler with independent double flue
  • Circulating fluidized bed boiler with independent double flue

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Embodiment Construction

[0048] In the prior art, when the outlet flue structures of multiple cyclone separators on the same side are different in flue gas resistance, the separation efficiencies of multiple cyclone separators on the same side will be different, resulting in the difference between multiple circulation loops on the same side. The amount of circulating ash between the furnaces is different, which eventually leads to a serious uneven distribution of bed temperature along the width direction of the long side of the furnace. figure 1 It is a schematic top view of a circulating fluidized bed boiler in the prior art, such as figure 1As shown, it connects the outlet flues of the three cyclone separators on the same side along the direction from the front wall to the rear wall and then connects with the tail flue inlet located outside the rear wall of the furnace. For the outlets of the above multiple cyclone separators The layout of the tail flue, due to the different flue structures of multi...

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Abstract

The invention provides a circulating fluidized bed boiler with independent double flues. The circulating fluidized bed boiler comprises a hearth with N outlets, wherein N represents an even number andis greater than or equal to 4, N / 2 cyclone separators arranged on the outer side of the left wall of the hearth, N / 2 cyclone separators arranged on the outer side of the right wall of the hearth, wherein inlets of the cyclone separators are communicated with the outlets of the hearth, and two tail flues arranged on the outer sides of the left and right walls, wherein inlets of the tail flues arerespectively communicated with upstream gas outlets of the N cyclone separators. Through use of the two independent tail flues on the outer sides of the left and right walls, it is solved that gas-solid flowing nonuniformity caused by different flue structures at the outlets of the cyclone separators, high temperature level and low temperature level metal connection pipes are effectively reduced,the boiler thermal efficiency is improved and the boiler manufacturing cost is reduced.

Description

technical field [0001] The invention relates to the technical field of circulating fluidized bed boilers, in particular to a circulating fluidized bed boiler with two independent tail flues. Background technique [0002] Large-scale and high-parameterization are inevitable trends in the development of circulating fluidized bed boiler technology. With the increase of circulating fluidized bed boiler capacity and the improvement of steam parameters, the cross-sectional area of ​​the furnace and the area of ​​the air distribution plate are gradually increasing, and the height of the furnace Gradually increasing, the number of cyclone separators arranged in parallel on one side of the furnace and the total number of cyclone separators on both sides continue to increase, the size of a single cyclone separator continues to increase, and the amount of circulating materials and flue gas continues to increase. The above factors Ultimately, the inhomogeneity of the gas-solid two-phase...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F23C10/18F23J15/02
CPCF23C10/18F23C2206/10F23J15/027F23J2217/40
Inventor 宋国良包绍麟
Owner INST OF ENGINEERING THERMOPHYSICS - CHINESE ACAD OF SCI
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