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Slag cooler for circulating fluid-bed boiler

A circulating fluidized bed and fluidized bed cooling technology, which is used in the cooling of fluidized bed combustion equipment and instruments, and the fuel burned in a molten state, can solve the problem that the slag cooler cannot work normally when it is larger than 8 mm or even up to 30 mm. , affecting the operation of the boiler and other problems, to achieve the effect of smooth discharge channel, uniform discharge, and not easy to block

Active Publication Date: 2008-12-31
江苏中国科学院能源动力研究中心 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its defect is that: due to the current domestic circulating fluidized bed boiler feed coal particle size is generally too large, part of the feed coal particle size is greater than 8 mm or even 30 mm, and coal particles exceeding 8-30 mm sometimes reach as high as 10%
After the large particle bottom slag enters the fluidized bed slag cooler, it is difficult to smoothly climb over the partition wall in the slag cooler and be discharged from the discharge port under the action of the fluidization wind, but it will deposit in the slag cooler, causing the slag cooler It cannot work normally, and even affects the operation of the boiler in severe cases

Method used

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  • Slag cooler for circulating fluid-bed boiler
  • Slag cooler for circulating fluid-bed boiler
  • Slag cooler for circulating fluid-bed boiler

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The slag cooler of a circulating fluidized bed boiler in this embodiment is as follows: figure 1 and figure 2 As shown, it can be seen from the figure that a selection chamber 3 and a large particle cooling chamber 4 are provided between the inlet end of the air-water combined fluidized bed slag cooler and the fluidized bed cooling chamber 1, and the selection chamber 3 is located above the large particle cooling chamber 4. Its bottom surface has the same shape and area as the cross section of the large particle cooling chamber 4, and the ratio of the area of ​​the upper cross section of the selection chamber 3 to the cross section of the large particle cooling chamber 4 is 0.3 (or 0.6); the bottom of the selection chamber 3 is horizontally arranged with a belt The air distribution pipe 6 of the wind cap 5, the net pipe spacing of the air distribution pipe 6 is 60 mm, the selection chamber 3 and the large particle cooling chamber 4 are connected through the gap between...

Embodiment 2

[0016] The slag cooler of a circulating fluidized bed boiler in this embodiment is as follows: image 3 and Figure 4 As shown, it can be seen from the figure that a selection chamber 3 and a large particle cooling chamber 4 are provided between the inlet end of the air-water combined fluidized bed slag cooler and the fluidized bed cooling chamber 1, and the selection chamber 3 is located above the large particle cooling chamber 4. Its bottom surface is identical to the shape and area of ​​the cross-section of the large particle cooling chamber 4, and the ratio of the area of ​​the upper cross section of the selection chamber (3) to the cross section of the large particle cooling chamber 4 is 1.0; The air pipe 6 and the air distribution pipe 6 have a net pipe spacing of 100mm (or 80mm). The selection chamber 3 and the large particle cooling chamber 4 are connected through the gap between the air distribution pipe 6; the selection chamber 3 is connected to the fluidized bed coo...

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Abstract

The present invention relates to a slag-cooling device of circulating fluid-bed boiler. Its structure is characterized by that between the bottom slag inlet and fluid-bed cooling chamber a selection chamber and a large-granule cooling chamber are set, the selection chamber is positioned over the large-granule cooling chamber, its bottom surface is identical to cross-section form and area of the large-granule cooling chamber, the area ratio of the cross-section of upper portion of selection chamber and cross-section of large-granule cooling chamber is 0.3-10; on the bottom portion of selection chamber the air-distributing pipes are horizontally arrangement, and the selection chamber and large-granule cooling chamber are mutually communicated by means of gap between the air-distributing pipes. Besides, said invention also provides the concrete working principle of said slag-cooling device.

Description

technical field [0001] The invention relates to a boiler ash cooling device, in particular to a slag cooler for a circulating fluidized bed boiler. Background technique [0002] The circulating fluidized bed boiler generally needs to discharge the bottom slag from the bottom of the furnace during operation. The function of the slag cooler is to cool the high-temperature bottom slag, recover heat, and reduce the temperature of the bottom slag to facilitate transportation. At present, the commonly used slag coolers are water-cooled, air-cooled and combined air / water-cooled. Among them, the air / water combined fluidized bed slag cooler is widely used in large-capacity circulating fluidized bed boilers due to the large capacity of a single unit; its structure includes a moving bed 2 with a slag inlet, the first fluidized bed The bed air chamber 6 and the second fluidized bed air chamber 10 with the flue gas return port 12 and the slag discharge port 13 are provided with a parti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F23C10/24G12B15/04F23C101/00
Inventor 吕清刚孙运凯那永洁高鸣包绍麟
Owner 江苏中国科学院能源动力研究中心