Device and method for recovering bottom slag heat of circulating fluidized bed boiler

A heat recovery device, a technology of circulating fluidized bed, which is applied in the directions of fluidized bed combustion equipment, combustion method, lighting and heating equipment, etc., can solve the problems of reducing boiler thermal efficiency, boiler heat loss, and difficulty in enlarging the drum slag cooler. , to reduce physical heat loss and improve thermal efficiency

Active Publication Date: 2011-07-06
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

However, with the advancement of large-scale circulating fluidized bed boilers, the defect that the drum type slag cooler is difficult to enlarge has become more and more prominent
More importantly, when the bottom slag is discharged from the furnace, the temperature is usually higher than 800°C, which takes away a lot of heat, while the drum slag cooler usually uses industrial water or power plant condensate as the cooling medium for the bottom slag, and the bottom slag is taken away from the furnace The heat cannot be utilized by the boiler, which becomes the heat loss of the boiler and reduces the thermal efficiency of the boiler

Method used

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  • Device and method for recovering bottom slag heat of circulating fluidized bed boiler
  • Device and method for recovering bottom slag heat of circulating fluidized bed boiler
  • Device and method for recovering bottom slag heat of circulating fluidized bed boiler

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Experimental program
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Effect test

Embodiment 1

[0039] Such as figure 1 Shown is a schematic structural view of Embodiment 1 of a circulating fluidized bed boiler bottom slag heat recovery device of the present invention, wherein: circulating fluidized bed boiler furnace 1, air distribution pipe 2, bottom slag heat recovery chamber 21, cold slag The heat exchange tube 22 on the heat exchange surface, the slag outlet 23, and the slag remover 24.

[0040] The bed surface at the bottom of the furnace 1 of the circulating fluidized bed boiler is all air distribution pipes 2 with hoods, and there is a gap between the two air distribution pipes to allow the passage of bottom slag particles. A bottom slag heat recovery chamber 21 is arranged below the air distribution pipe 2 , and the bottom slag heat recovery chamber 21 is directly communicated with the boiler furnace 1 through the gap between the air distribution pipes 2 . The bottom of the recovery chamber 21 is in the shape of an inverted cone, and the bottom end of the cone ...

Embodiment 2

[0046] Such as figure 2 As shown, it is a structural schematic diagram of Embodiment 2 of a circulating fluidized bed boiler bottom slag heat recovery device of the present invention, wherein: the lower header 25 of the water-cooled wall. The main structure of embodiment 2 is the same as that of embodiment 1, but the heat exchange tube 22 on the cold slag heat exchange surface merges into the lower header 25 of the water-cooled wall of the furnace side wall, that is, the lower header 25 of the water-cooled wall of the furnace side wall is used as the middle The header makes the heat exchange tube on the cold slag heat exchange surface directly communicate with the water wall of the side wall of the furnace;

[0047] The bottom slag generated by combustion in the furnace 1 falls into the bottom slag heat recovery chamber 21 from the air distribution pipe 2, and directly contacts and exchanges heat with the cold slag heat exchange surface heat exchange tube 22 installed in the ...

Embodiment 3

[0049] Such as image 3 As shown, it is a structural schematic diagram of Embodiment 3 of a circulating fluidized bed boiler bottom slag heat recovery device according to the present invention, in which: an air distribution plate 3 and an air chamber 31 . The main structure of embodiment 3 is the same as most of embodiment 1, the difference is:

[0050] The bottom bed surface of circulating fluidized bed boiler furnace 1 is divided into three areas along the width direction of the furnace: the air distribution device in the area near the left wall and the right wall is the air distribution plate 3, and the air distribution device in the middle area is the air distribution pipe 2. Bottom slag heat recovery chamber 21 is provided below the air distribution pipe 2, and there is a space between the two air distribution pipes to accommodate the passage of bottom slag particles. The recovery chamber 21 is directly connected to the boiler furnace 1 through the gap between the air di...

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Abstract

The invention discloses a device and a method for recovering bottom slag heat of a circulating fluidized bed boiler and relates to a circulating fluidized bed boiler technology. A bottom slag heat recovering chamber is formed below the hearth of the circulating fluidized bed boiler and is directly communicated with the hearth through gaps among air distribution pipes of the hearth; and the bottom slag falls into the bottom slag heat recovering chamber from the gaps among the air distribution pipes and exchange heat with a cold slag heat exchange surface formed in the bottom slag heat recovering chamber; and after being cooled, the bottom slag is discharged out of the boiler from the bottom of the bottom slag heat recovering chamber, and a cooling medium in the cold slag heat exchange surface is heated. The working medium of the circulating fluidized bed boiler is used as the bottom slag cooling medium, the heat brought out of the hearth by the bottom slag is recovered, and the physical heat loss of the boiler slag is reduced, so that the heat efficiency of the boiler is improved.

Description

technical field [0001] The invention relates to the technical field of circulating fluidized bed boilers, in particular to a bottom slag cooling device and method for circulating fluidized bed boilers. technical background [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. The more commonly used slag coolers are fluidized bed slag cooler and drum slag cooler. [0003] Due to the large capacity of a single unit, the air-water combined fluidized bed slag cooler is widely used in large-capacity circulating fluidized bed boilers. However, domestic circulating fluidized bed boilers generally have a relatively large coal particle size range, and more large-grain bottom slag is formed after combustion. After entering the fluidiz...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23C10/24
Inventor 吕清刚孙运凯王东宇高鸣李诗媛包绍麟那永洁
Owner INST OF ENGINEERING THERMOPHYSICS - CHINESE ACAD OF SCI
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