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Afterheat recycling device for bottom slag of circulating fluidized bed boiler

A technology of circulating fluidized bed and recovery device, which is applied to fluidized bed combustion equipment, lighting and heating equipment, and burning fuel in a molten state, etc., can solve problems such as reducing energy quality, limiting waste heat recovery and utilization efficiency, etc. The effect of using convenience and prolonging contact time

Active Publication Date: 2017-08-04
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The cooling medium with lower final temperature reduces the energy grade and limits the utilization efficiency of waste heat recovery

Method used

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  • Afterheat recycling device for bottom slag of circulating fluidized bed boiler
  • Afterheat recycling device for bottom slag of circulating fluidized bed boiler
  • Afterheat recycling device for bottom slag of circulating fluidized bed boiler

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Embodiment

[0021] The structure of this embodiment is as figure 1 , figure 2 and image 3 As shown, this embodiment includes a slag inlet pipe 2, a moving bed heat exchanger 6 and a rotary slag discharge valve 7, and is characterized in that the moving bed heat exchanger 6 is composed of a bottom slag flow equalizing device 6-1, a cooling flue inlet 6 -2. Composed of cooling flue outlet 6-3, deflector 6-4, furnace wall 6-5 and cooling flue 6-6, the upper part of the moving bed heat exchanger 6 is provided with a slag inlet connected to the furnace 3 Tube 2, in the bottom slag channel of the moving bed heat exchanger 6, two of the opposite wall surfaces adopt a streamlined gradual expansion structure, and the gradual expansion angle of the other two opposite wall surfaces is 0-10°. A prismatic or streamlined cross-section bottom slag equalization device 6-1 made of high-temperature refractory castables is installed at the bottom slag inlet on the top of the device, and at the flue gas ...

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Abstract

The invention discloses an afterheat recycling device for bottom slag of a circulating fluidized bed boiler. The afterheat recycling device comprises a slag inlet pipe (2), a mobile bed heat exchanger (6) and a rotary slag discharging valve (7), and is characterized in that a bottom slag channel of the mobile bed heat exchanger (6) adopts a streamlined expanding-gradually structure; a bottom slag flow equalization device (6-1) is arranged at an inlet of the mobile bed heat exchanger (6); diversion plates (6-4) which are inclined downwards to the inner side are arranged at each layer of flue gas inlets and flue gas outlets of a cooling flue (6-6); high-temperature bottom slag flows from top to bottom in the mobile bed heat exchanger (6); low-temperature flue gas which is pressurized by a re-recycling flue gas blower (12) does reciprocating direct contact by multi-loop along the diversion plate (6-4) and is subjected to heat adsorption, and then returns to a furnace hearth (3) or a boiler tail flue (8), and the cooled bottom slag is discharged by the rotary slag discharging valve (7). By utilizing re-recycling flue gas as a cooling medium of the bottom slag of the circulating fluidized bed boiler, a large majority of heat energy caused by bringing the bottom slag out of the furnace hearth is recycled into the boiler, so that the physical heat loss of ash slag is reduced, and the heat efficiency of the boiler is improved.

Description

[0001] Technical field: [0002] The invention belongs to the technical field of circulating fluidized bed boilers, in particular to a device for cooling high-temperature bottom slag and recovering waste heat of circulating fluidized bed boilers. [0003] Background technique: [0004] The high-temperature bottom slag discharged from the circulating fluidized bed boiler contains a large amount of physical sensible heat, and it is necessary to use a suitable bottom slag cooling device for bottom slag cooling and waste heat recovery. At present, the more commonly used bottom slag cooling devices include drum slag coolers and fluidized bed slag coolers, and there are also moving bed slag coolers or combined moving bed + fluidized bed slag coolers. However, these high-temperature bottom slag cooling devices have their own technical problems at present, and it is difficult to solve the problem of waste heat utilization of the recovered bottom slag heat. [0005] When the drum slag ...

Claims

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Application Information

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IPC IPC(8): F23C10/24F23C10/18
CPCF23C10/18F23C10/24F23C2206/103
Inventor 卢啸风杨宇王泉海李建波徐杰陈晔郭强
Owner CHONGQING UNIV
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