Circulating fluidized bed boiler

A circulating fluidized bed and boiler technology, which is applied in the directions of fluidized bed combustion equipment, fuel burned in a molten state, combustion type, etc., can solve the problems of difficult bed surface fluidization, small air distribution resistance, and uneven fluidization. Solve the problem of air cap wear and slag leakage and improve efficiency

Active Publication Date: 2011-10-19
CHINA SHENHUA ENERGY CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the small air distribution resistance will also lead to difficulty or uneven fluidization of the bed surface

Method used

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  • Circulating fluidized bed boiler
  • Circulating fluidized bed boiler
  • Circulating fluidized bed boiler

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Embodiment Construction

[0025] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

[0026] The circulating fluidized bed boiler of the present invention includes an air distribution device and a furnace surrounded by a water wall 10, the air distribution device includes an air distribution plate 1, a plurality of air pipes 2 extending through the air distribution plate 1 and installed on The air cap 3 on each air pipe 2 has an opening communicating with the air pipe 2, wherein: in the central area of ​​the air distribution plate 1, the flow area of ​​the air distribution device is smaller than the rest The flow area of ​​the region; the corner portion between two adjacent water cooling walls 10 has a transition layer 13 , and the transition lay...

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Abstract

The invention discloses a circulating fluidized bed boiler, which comprises an air distributor and a hearth surrounded by water cooling walls, wherein the air distributor comprises an air distributing plate, a plurality of air pipes passing through the air distributing plate to extend and air caps arranged on each air pipe, and a hole is formed on each air cap and communicated with the air pipe; in the central region of the air distributing plate, the flow area of the air distributor is smaller than those of other regions; a transition layer is arranged on a corner part between two adjacent water cooling walls and generates arc transition between the adjacent water cooling walls. By reducing the flow area in the central region with a thinner bed material, the aims of grading air distribution and uniform fluidizing are fulfilled, so that the efficiency of the circulating fluidized bed boiler is improved and the problems of air cap wear and slag leakage can also be solved radically. Moreover, the arc-shaped transition layer is formed between the adjacent water cooling walls, so that the wear of the corner parts can be relieved. Thus, the circulating fluidized bed boiler of the invention can guarantee long-period, safe and stable operation.

Description

technical field [0001] The present invention relates to circulating fluidized bed boilers. Background technique [0002] Circulating fluidized bed boilers use circulating fluidized bed combustion technology, which has the advantages of good fuel adaptability, high efficiency, and less pollution emissions. Among them, the fluidization is realized by the following method: the air required for combustion enters the fluidized bed evenly through the air distribution plate at the bottom of the furnace, and maintains an appropriate airflow rising speed in the fluidized bed, and the airflow holds up most of the material particles While moving up and down, it becomes boiling, so the mixing is very strong. It can be seen that the ventilation system is the key to the entire combustion system. [0003] In the circulating fluidized bed boiler, the fan provides air to the air preheater for preheating, and the preheated air enters the bottom air chamber of the furnace, and enters the fur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F23C10/20
Inventor 刘利军白志强王志璋闫建恩毕台军崔飞娥霍志国
Owner CHINA SHENHUA ENERGY CO LTD
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