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Ultra-large circulating fluidized bed boiler

A circulating fluidized bed, ultra-large technology, applied in the direction of fluidized bed combustion equipment, combustion type, fuel burned in the molten state, etc., can solve the problem of large-scale development of high parameters of circulating fluidized bed boilers, tail flue gas Problems such as excessive deviation and difficult maintenance of the heating surface of the inner ring achieve the effects of strong secondary air penetration, small footprint, and appropriate cross-sectional width-to-depth ratio

Pending Publication Date: 2022-03-01
DONGFANG BOILER GROUP OF DONGFANG ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The interior of the annular furnace described in this patent is a closed area, and the maintenance of the heating surface of the inner ring is more difficult than conventional furnaces, and because the separator is arranged outside the furnace, it occupies a large area and costs high
The flue gas at the exit of the separator will be introduced into the tail flue from both sides, which may lead to excessive deviation of the flue gas in the tail flue, and uneven heating of the tail flue, which limits the development of higher parameters
[0006] Therefore, the existing patented technology limits the high-parameter and large-scale development of circulating fluidized bed boilers to a certain extent

Method used

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  • Ultra-large circulating fluidized bed boiler
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  • Ultra-large circulating fluidized bed boiler

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Such as image 3 and 4 As shown, a 1000MW ultra-large circulating fluidized bed boiler includes a furnace 1 composed of a membrane water-cooled wall and a cyclone separator 2. The furnace 1 is composed of interconnected front furnaces and left and right furnaces. U-shaped structure, that is, the cross-section of the furnace is U-shaped, and the left and right furnaces are arranged symmetrically with respect to the axial center line of the boiler. Inside the furnace, the cyclone separator 2 is arranged in the middle area of ​​the U-shaped furnace 1 and is connected to the furnace 1 through the flue. The boiler occupies a small area, and the inside of the furnace, the separator, and the feeder are all convenient for maintenance.

[0032] In this embodiment, the length AB of the left side of the U-shaped furnace 1, the length BC of the front side and the length CD of the right side of the furnace are 1:1:1, and the widths of the three sides of the U-shaped furnace 1 are e...

Embodiment 2

[0039] This embodiment is basically the same as Embodiment 1, the main difference is: as Figure 5 and 6 As shown, when the depth of the furnace is small and the width is large, the two cyclone separators near the front furnace are connected to the front furnace through independent flues, and the other cyclones are connected to the left and right furnaces through independent flues. connected. Among them, the cyclone separator body has the same structural parameters, and the left and right cyclone separator groups are arranged symmetrically. Due to the small depth of the furnace, in order to arrange a sufficient number of superheaters and reheaters, an external heat exchanger is installed at the bottom of the cyclone separator. Device 6, the tail wall adopts a single flue structure.

Embodiment 3

[0041] This embodiment is basically the same as Embodiment 2, the main difference is: as Figure 7 As shown, the bending angle α formed between the left and right sides of the U-shaped furnace and the front side furnace is between 90° and 180°, and the cyclone separator is arranged along the bending direction of the left and right sides of the furnace. .

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Abstract

The ultra-large circulating fluidized bed boiler comprises a hearth and a cyclone separator, the hearth is of a U-shaped structure composed of a front-side hearth, a left-side hearth and a right-side hearth, the front-side hearth, the left-side hearth and the right-side hearth are communicated with one another, the left-side hearth and the right-side hearth are symmetrically arranged relative to the axial center line of the boiler, and a notch of the U-shaped hearth faces a tail flue. And the cyclone separator is arranged in the middle area of the U-shaped hearth and is connected with the hearth through a flue. The hearth of the U-shaped structure is adopted, after the hearth is large, the width-depth ratio of the section is appropriate, the secondary air penetrability is high, meanwhile, the hearth of the U-shaped structure, the left hearth and the right hearth are communicated together, through uniform air distribution and coal feeding, it is guaranteed that flowing in the boiler is uniform, the flue gas deviation of the hearth is small, and the reliability of the boiler in the operation process is improved; the U-shaped hearth tail notch facilitates internal maintenance, the left separator and the right separator are arranged in the middle area of the U-shaped hearth, the occupied area is small, and maintenance is easy.

Description

technical field [0001] The invention belongs to the technical field of combustion equipment, in particular to a super-large circulating fluidized bed boiler. Background technique [0002] Circulating fluidized bed boiler has the characteristics of wide fuel adaptability and low pollutant emission, and it has developed rapidly in China in recent decades. At present, my country's circulating fluidized bed boiler technology is in the leading position in the world, and further, it is also moving towards higher parameters and larger capacity. [0003] The main feature of the circulating fluidized bed boiler is that the main circulation loop of the material is formed before the furnace, the separator, the feeder and the external heat exchanger (if any). Restricted by the furnace width-to-depth ratio and secondary air penetration requirements, the furnace type is the primary problem to be solved in the research and development of large circulating fluidized bed boilers. At the sa...

Claims

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Application Information

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IPC IPC(8): F23C10/08F23C10/18F23C10/20
CPCF23C10/08F23C10/18F23C10/20
Inventor 巩李明邓启刚朱洋黄敏鲁佳易苏虎何维聂立
Owner DONGFANG BOILER GROUP OF DONGFANG ELECTRIC CORP
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