Ultralow-dust rear smoke channel system of boiler

A tail flue, ultra-low ash technology, applied in combustion methods, lighting and heating equipment, exhaust gas devices, etc., can solve problems such as performance degradation, affecting the normal operation of the boiler, reliability and economic impact, and avoid poisoning , Improve economy and reliability, and improve efficiency

Inactive Publication Date: 2015-04-22
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Therefore, the reliability and economy of various equipment installed in the tail flue of the boiler are affected by the ash concentration of the flue gas, resulting in performance degradation
In severe cases, it can also affect the normal operation of the boiler

Method used

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  • Ultralow-dust rear smoke channel system of boiler
  • Ultralow-dust rear smoke channel system of boiler
  • Ultralow-dust rear smoke channel system of boiler

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] figure 2 Shown is a specific embodiment of the present invention, which also uses a 125MW coal-fired boiler. The boiler uses a high-temperature dust removal system 3 arranged before the denitrification system 4 to replace the traditional electrostatic precipitator 11. The boiler furnace (not shown) discharges The dust-laden flue gas enters the economizer 2 through the flue inlet 1, and then enters the denitrification system 4, the air preheater 5, the flue gas waste heat recovery system 6, the induced draft fan 7 and the desulfurization system 8 after being dedusted by the high-temperature dust removal system 3. Finally, it is discharged through the chimney 9.

[0027] During the operation of this embodiment, the high-temperature dust removal system 3 adopts a high-temperature electrostatic precipitator that can withstand a temperature of 400° C., so as to operate normally in the high-temperature area between the economizer 2 and the denitrification system 4 . The hig...

Embodiment 2

[0033] The difference between this example and Example 1 is that a high-temperature ceramic precipitator is used instead of a high-temperature electric precipitator. The interior of the high-temperature ceramic precipitator is mainly composed of porous ceramic filter tubes and structural supports, and can operate in a high-temperature environment of up to 1000°C. Temperature changes have little effect on the dust removal efficiency, and the running resistance is small. The high temperature ceramic dust collector can make the dust removal efficiency as high as 99.96%, which is 0.1%-0.5% higher than the general electric dust collector, and the initial investment cost is low, and it is not affected by the change of the boiler load. .

[0034] In addition, the high-temperature dust removal system of the present invention can also adopt a combination of high-temperature ceramic material dust collector and high-temperature electric dust collector, the high-temperature electric dust c...

Embodiment 3

[0036] This embodiment is a further improvement on Embodiment 1, mainly by modifying the structure of the flue gas waste heat recovery system 6 .

[0037] Same as Example 1, the high-temperature dedusting system 3 of this embodiment is arranged before the denitrification system 4, and the dusty flue gas discharged from the boiler furnace (not shown) enters the economizer 2 through the flue inlet 1, and passes through the high-temperature dedusting system 3 After dust removal, it enters the denitrification system 4, the air preheater 5, the flue gas waste heat recovery system 6, the induced draft fan 7 and the desulfurization system 8, and is finally discharged through the chimney 9.

[0038] The flue gas waste heat recovery system 6 in this embodiment includes an inlet header 61, an outlet header 62, and a heat exchange tube bundle 63. The heat exchange tube bundle 63 is a spiral finned tube with a fin pitch of 4mm. Since the flue gas waste heat recovery system 6 in the embodi...

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Abstract

The invention relates to an ultralow-dust rear smoke channel system of a boiler. The ultralow-dust rear smoke channel system comprises an economizer, a denitration system and an air pre-heater. A high-temperature dust removal system is arranged in back of the economizer and in front of the denitration system, the denitration system is communicated with a desulfurization system through the air pre-heater, a smoke waste heat recovery system and a draught fan, the air pre-heater, the smoke waste heat recovery system and the draught fan are sequentially connected, and the desulfurization system is connected with a chimney. The equipment size of the denitration system, the air pre-heater, the smoke waste heat recovery system and the desulfurization system can be reduced, and original measures for preventing abrasion, corrosion, dust deposition and dust clogging can be omitted, so that the cost is lowered, the structure is simplified, and space is saved.

Description

technical field [0001] The invention relates to a boiler flue system, in particular to a boiler flue system capable of greatly reducing the dust concentration of flue gas at the outlet of a boiler economizer, so that the entire tail flue is in an almost ash-free working state, belonging to The field of thermal power generation. Background technique [0002] In the current boiler tail flue system, the flue gas dust removal system is generally installed in the flue after the air preheater and before the desulfurization device. Since the combustion of boilers, especially coal-fired boilers, will produce a large amount of ash, the equipment working in the environment of high dust and flue gas will be affected by the ash. [0003] When the dust-laden flue gas flows through the denitrification system, elements such as Na, K, Si, and As contained in the fly ash will pollute or poison the catalyst, and the flue gas containing fine dust particles will wear the reactor and block the ...

Claims

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Application Information

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IPC IPC(8): F23J11/00F23J13/00
Inventor 孙奉仲张一坤史月涛魏伟
Owner SHANDONG UNIV
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