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Circulating fluidized bed boiler with high internal circulation ratio

A circulating fluidized bed and internal circulation technology, which is applied to fluidized bed combustion equipment, fuel burning in a molten state, lighting and heating equipment, etc., can solve the problems of poor stability and uniformity of boiler bed temperature, and achieve NOx Ease of discharge control, reduced bed volume, and reduced flow resistance effects

Pending Publication Date: 2018-04-27
SHANGHAI BOILER WORKS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0037] The problem to be solved by the present invention is that the existing circulating fluidized bed boiler has poor bed temperature stability and poor uniformity.

Method used

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  • Circulating fluidized bed boiler with high internal circulation ratio
  • Circulating fluidized bed boiler with high internal circulation ratio
  • Circulating fluidized bed boiler with high internal circulation ratio

Examples

Experimental program
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Embodiment 1

[0060] Such as image 3 As shown, a circulating fluidized bed boiler with a high internal circulation ratio provided in this embodiment includes a furnace 1, and the bottom of the furnace 1 is sequentially provided with a second cone section water cooling wall 24, a vertical section water cooling wall 23, The first cone section water cooling wall 22 constitutes a double cone section structure in the dense phase area of ​​the boiler; the bottom of the first cone section water cooling wall 22 is provided with a horizontally arranged air distribution plate 21 . The included angle between the water cooling wall 22 of the first conical section and the inner horizontal plane of the boiler is 100°; the included angle between the second conical section 24 and the inner horizontal surface of the boiler is 120°. The four inwalls of the furnace 1 are respectively provided with the water-cooled wall of the front wall of the furnace, the water-cooled wall of the rear wall of the furnace, t...

Embodiment 2

[0065] Such as Figure 4 As shown, a circulating fluidized bed boiler with a high internal circulation ratio provided in this embodiment includes a furnace 1, the bottom of the furnace 1 is provided with a second conical section water cooling wall 24, and the second conical section water cooling wall 24 The bottom of the water cooling wall 22 is provided with a first cone section, that is, the dense phase area of ​​the boiler is a double cone section structure; the bottom of the first cone section water cooling wall 22 is provided with a horizontally arranged air distribution plate 21 . The angle between the water wall 22 of the first cone section and the horizontal plane in the boiler is 140°; the angle between the second cone section 24 and the horizontal plane in the boiler is 170°. The four inner walls of the furnace 1 are respectively provided with the water-cooled wall of the front wall of the furnace, the water-cooled wall of the rear wall of the furnace, the water-cool...

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Abstract

The invention discloses a circulating fluidized bed boiler with a high internal circulation ratio. The circulating fluidized bed boiler comprises a hearth, and is characterized in that a second conical section water cooling wall is arranged at the bottom of the hearth, and a first conical section water cooling wall is arranged at the bottom of the second conical section water cooling wall, that is, a dense phase area of the boiler is of a double-conical-section structure; and a wind distribution plate is horizontally arranged at the bottom of the first conical section water cooling wall. The circulating fluidized bed boiler with high internal circulation ratio and the double-conical-section dense phase area improves the internal circulation ratio thereof, so that the temperature field in the boiler is more uniform, the external circulation flow is reduced, the separator resistance is reduced, and meanwhile, the fan power consumption and the start ignition oil consumption are reduced.

Description

technical field [0001] The invention relates to a circulating fluidized bed boiler, in particular to a circulating fluidized bed boiler with a double-cone section dense-phase zone design and a high internal circulation rate. Background technique [0002] Circulating fluidized bed boilers have developed rapidly in my country. With the continuous deepening and improvement of the cognition level of circulating fluidized bed boiler technology, CFB boiler technology has been further improved and developed, and a new generation of low energy consumption, low pollutant emissions and high efficiency has been developed. CFB unit is the direction and development goal of CFB boiler designers. [0003] From the perspective of the overall development of the circulating fluidized bed, the interface between the upper dilute phase zone and the lower dense phase zone in the traditional low gas velocity boiling fluidization has become dispersed or even disappeared, and the particle concentrati...

Claims

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Application Information

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IPC IPC(8): F23C10/12F23C10/18
CPCF23C10/12F23C10/18
Inventor 肖峰罗勇军高琴黄建荣许秀启黄永志徐亮
Owner SHANGHAI BOILER WORKS