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Octagonal hearth circulating fluidized bed boiler with multiple separators

A circulating fluidized bed, octagonal technology, applied in the field of large circulating fluidized bed boilers, can solve problems such as the influence of cyclone separators

Active Publication Date: 2016-12-07
INST OF ENGINEERING THERMOPHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The cross-section of the furnace is changed from rectangular to octagonal, which has an impact on the cyclone separator, and the original separator arrangement is no longer suitable for this furnace type

Method used

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  • Octagonal hearth circulating fluidized bed boiler with multiple separators
  • Octagonal hearth circulating fluidized bed boiler with multiple separators
  • Octagonal hearth circulating fluidized bed boiler with multiple separators

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Such as figure 2 Shown is an octagonal furnace circulating fluidized bed boiler with multi-cyclone separators of the present invention.

[0044] The cross-section of the furnace is octagonal, with eight side walls, which are the front wall, rear wall, left side wall, and right side wall of the furnace, and four membrane-type water-cooled walls that cut corners with these four side walls. The cross-section of the furnace is axisymmetric about the line connecting the center points of the front and rear walls of the furnace and the line connecting the center points of the left and right side walls of the furnace.

[0045] One group and three cyclone separators are arranged on the rear wall AG of the furnace. The two cyclone separators located on the outside are arranged inwardly, and the tangential side is perpendicular to the rear wall of the furnace, that is, the angle α between the tangential side of the separator inlet flue and the rear wall of the furnace is 90°. A...

Embodiment 2

[0048] Such as image 3 Shown is an octagonal furnace circulating fluidized bed boiler with multi-cyclone separators of the present invention. The cross-section of the furnace is octagonal, with eight side walls, which are the front wall, rear wall, left side wall, and right side wall of the furnace, and four membrane-type water-cooled walls that cut corners with these four side walls. The cross-section of the furnace is axisymmetric about the line connecting the center points of the front and rear walls of the furnace and the line connecting the center points of the left and right side walls of the furnace.

[0049] One set and two cyclone separators are arranged on the rear wall AG of the furnace. The two cyclone separators are arranged inwardly, and the tangential edge of the inlet flue of the separator forms an angle of 110° with the rear wall of the furnace. The inlet flue of the separator has a flaring section BB', that is, the hypotenuse of the inlet flue of the separ...

Embodiment 3

[0052] Such as Figure 4 Shown is an octagonal furnace circulating fluidized bed boiler with multi-cyclone separators of the present invention. Two groups, each group of three cyclone separators are arranged on the left wall and the right wall of the furnace. Each set of outermost cyclone separators is inscribed, the distance between the hypotenuse of the inlet flue and the cut angle AH is AB, and the inner wall of the tangential side of the separator forms an angle of 100° with the left and right side walls of the furnace. The inlet section of the inlet flue of the separator has a flared section BB'. The cross-sections of the inlet flues of the two cyclone separators outside each group are axisymmetric with respect to the center line of the furnace, which is the line connecting the center points of the left and right walls of the furnace.

[0053] The distance between the hypotenuse of the inlet flue of each group of outer two separators and the cut angle AH is AB, the leng...

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Abstract

The invention provides an octagonal circulating fluidized bed boiler with multiple separators. The octagonal circulating fluidized bed boiler comprises a hearth, the first cyclone separator and the second cyclone separator, wherein the cross section of the hearth is octagonal; the hearth is composed of a front wall, a back wall, a left side wall, a right side wall and four membrane walls, and an angle beta is formed between each side wall and the corresponding membrane wall on the cross section; the cross section of the hearth is provided with a hearth front and back wall center line and a hearth left and right side wall center line and is axisymmetrical with respect to the two center lines; the first cyclone separator and the second cyclone separator are arranged on the back wall of the hearth; the tube structure and the size of the first cyclone separator are the same as those of the second cyclone separator; the inlet flue duct cross section of the first cyclone separator and the inlet flue duct cross section of the second cyclone separator are symmetrical with respect to the hearth front and back wall center line; in the tangential edges and the bevel edges of the inlet flue duct cross sections of the first cyclone separator and the second cyclone separator, the tangential edges are closer to the hearth front and back wall center line; the angle formed between the inner wall of the tangential edge of the inlet flue duct cross section of each cyclone separator and the back wall of the hearth is 90-110 degrees; and in addition, the position of an inlet flue duct of the first cyclone separator and the position of an inlet flue duct of the second cyclone separator both meet the following formula that AB=BC-(0.1-0.5)CD*cot beta.

Description

technical field [0001] The invention relates to circulating fluidized bed boiler technology, especially large circulating fluidized bed boiler. Background technique [0002] With the enlargement of circulating fluidized bed boiler capacity, the number of cyclone separators also increases. However, when multiple cyclones are arranged in parallel, the flow distribution of the flue gas among the cyclones tends to be uneven, which will affect the flue gas flow and particle distribution in the furnace. In engineering applications, it is often encountered that the boiler with multi-cyclone separators is unevenly distributed in each circulation loop during operation. When the distribution of materials is uneven, "bias flow" will appear in the furnace, and the temperature distribution of the furnace bed will be uneven. Some boiler furnaces even have a temperature deviation of 100-200 °C. The uneven distribution of the temperature field on the combustion side of the boiler directly...

Claims

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Application Information

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IPC IPC(8): F23C10/08F23C10/18
Inventor 王东宇王小芳吕清刚那永洁孙运凯高鸣
Owner INST OF ENGINEERING THERMOPHYSICS - CHINESE ACAD OF SCI
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