A bed material external circulation device and operation method for circulating fluidized bed boiler

A circulating fluidized bed and external circulation technology, applied in the field of low-ash low-quality fuel combustion equipment, can solve problems affecting the normal and stable operation of boilers, achieve the effects of reducing slag discharge losses, achieving self-sufficiency, and improving combustion efficiency

Active Publication Date: 2018-10-12
BEIJING NOWVA ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method has some effects, there are certain limitations due to the position of returning the bed material and mechanical transportation, especially when the inclined section of the ash hopper and the separator has a strong tendency to slag, if the slag cannot be cleaned in time, It is still easy to affect the normal and stable operation of the boiler for a long time

Method used

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  • A bed material external circulation device and operation method for circulating fluidized bed boiler
  • A bed material external circulation device and operation method for circulating fluidized bed boiler
  • A bed material external circulation device and operation method for circulating fluidized bed boiler

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Effect test

Embodiment 1

[0051] The invention provides a multi-process circulating fluidized bed boiler, which is equipped with an external circulation device for bed materials, and has a structure such as figure 1 shown, including:

[0052] Main combustion chamber 1, auxiliary combustion chamber 2, burnout chamber 3, separator 4, tail shaft 5, economizer 6, air preheater 7, drum 8, ash hopper 9, primary return box 10, primary Return pipe 11, secondary return box 12, secondary return pipe 13, slag discharge pipe 14, screening device 15, bed material return device 16, return pipeline system 17, nozzle 18, hose 19 and multi-directional Valve 20.

[0053] The main combustion chamber 1, the secondary combustion chamber 2 and the burnout chamber 3 are arranged side by side in sequence, the separator 4 is arranged behind the flue gas outlet of the burnout chamber 3, and the outlet flue of the separator 4 is connected with the flue of the tail shaft 5, An economizer 6 and an air preheater 7 are arranged in...

Embodiment 2

[0074] The present invention also provides a bed material external circulation device for a circulating fluidized bed boiler, the bed material external circulation device includes:

[0075] Screening device 15, bed material return device 16, return pipeline system 17, nozzle 18 and multi-way valve 20;

[0076] The screening device 15 is arranged at the bottom of the slag discharge pipe 14, and the material outlet of the screening device 15 is connected with the bed material returning device 16;

[0077] A multi-way valve 20 is arranged between the bed material return device 16 and the return pipeline system 17, and the different outlets of the multi-way valve are connected to the corresponding delivery pipelines of the return pipeline system 17;

[0078] The return pipeline system 17 returns the bed material to the nozzle 18 of the ash hopper 9 installed in the corresponding equipment through the corresponding delivery pipeline, and sprays it onto the inner wall of the ash hop...

Embodiment 3

[0081] The present invention also provides a bed material external circulation operation method for circulating fluidized bed boiler, which includes the following internal circulation of ash and the external circulation operation method of bed material:

[0082] Wherein the internal circulation operation method of ash comprises the following steps:

[0083] Step S101, when the ash volume of the primary return box 10 is relatively large at the initial stage of boiler operation: increase the air distribution of the primary return box 10 to increase the amount of primary return material;

[0084] Step S102, after the boiler has been running for a period of time, the temperature in the dense-phase area gradually increases, and at this time, gradually increase the air distribution of the secondary return material box 13 to increase the amount of secondary return material;

[0085]In step S103, when the boiler is running at full load, the air distribution of the first-level return b...

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Abstract

The invention relates to a bed material outer circulation device for a circulating fluidized bed boiler and an operation method thereof, a multiflow circulating fluidized bed boiler and a vertical type circulating fluidized bed boiler. A screening device (15) is arranged at the bottom of a slag removal pipe (14), a material outlet of the screening device (15) is connected to a bed material returning device (16). A multi-way valve (20) is arranged between the bed material returning device (16) and a returning pipe system (17). Different outlets of the multi-way valve are connected to corresponding conveyer pipes of the returning pipe system (17). The returning pipe system (17) returns a bed material to a nozzle (18) of an ash bucket (9) through the corresponding conveyer pipe under pneumatic conveying action and the nozzle (18) sprays the bed material to the inner wall of the ash bucket (9). The bed material outer circulation device rebuilds ash material balance, keeps good gas-solid flowing, combustion and heat transfer states in the boiler, effectively reduces a slag removal heat loss, improves combustion efficiency, realizes bed material self-sufficiency in low ash fuel combustion and guarantees stable boiler operation.

Description

technical field [0001] The invention relates to the field of low-ash low-quality fuel combustion equipment, in particular to a bed material external circulation device and operation method for a circulating fluidized bed boiler, a multi-process circulating fluidized bed boiler and a vertical circulating fluidized bed boiler. Background technique [0002] Circulating fluidized bed boilers have the following advantages: 1. High combustion efficiency, and can simultaneously perform pollution control operations such as desulfurization and denitrification in the furnace; 2. Clean combustion process, low NOx and SOx emissions; 3. Wide fuel adaptability, which can be burned With high-quality coal, low-quality coal, solid waste, biomass and other fuels can also be fired, so it has been rapidly developed in the power market at present. [0003] There are currently two types of traditional circulating fluidized bed boilers: [0004] A circulating fluidized bed boiler is a vertical ci...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F23C10/26
CPCF23C10/26F23C2206/10F23C2900/10007
Inventor 康建斌王军岗刘戈杨雷白彦茹单长武赵志田李纹广
Owner BEIJING NOWVA ENERGY TECH CO LTD
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