Ultra-large circulating fluidized bed boiler

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...

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

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