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Flue gas recirculation system for preventing low-temperature corrosion of tangentially pulverized coal fired boiler

A technology of recirculation system and pulverized coal boiler, which is applied to the burners, exhaust gas devices, combustion types and other directions of burning powder fuel, can solve the problems of increasing exhaust gas temperature, low temperature corrosion, affecting the economy of the unit, etc. Small concentration, the effect of alleviating low temperature corrosion problems and reducing SO3 generation

Pending Publication Date: 2021-06-29
XIAN THERMAL POWER RES INST CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods will inevitably bring about the problem of rising exhaust gas temperature, affecting the overall economics of the unit, and even if these methods are adopted, when the sulfur content of coal combustion is high, low-temperature corrosion will still exist at the cold end of the air preheater

Method used

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  • Flue gas recirculation system for preventing low-temperature corrosion of tangentially pulverized coal fired boiler
  • Flue gas recirculation system for preventing low-temperature corrosion of tangentially pulverized coal fired boiler

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Embodiment Construction

[0024] In order to enable those skilled in the art to better understand the solutions of the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only The embodiments are a part of the present invention, not all embodiments, and are not intended to limit the scope of the present invention. Also, in the following description, descriptions of well-known structures and techniques are omitted to avoid unnecessarily obscuring the concepts disclosed in the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0025] The schematic diagrams of the structures according to the disclosed embodiments of th...

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Abstract

The invention discloses a flue gas recirculation system for preventing low-temperature corrosion of a tangentially pulverized coal fired boiler. The flue gas recirculation system comprises a flue gas pipeline, flue gas pipelines, a recirculation fan and an adjustable shrinkage cavity, an inlet flue of an air preheater is provided with a flue gas exhaust port, one end of the flue gas pipeline communicates with the flue gas exhaust port, the other end of the flue gas pipeline communicates with an inlet of the recirculation fan, and an outlet of the recirculation fan communicates with recirculation flue gas nozzles on a hearth through the flue gas pipelines. The system can slow down low-temperature corrosion of the cold end of the air preheater, and meanwhile has good economical efficiency.

Description

technical field [0001] The invention belongs to the field of pulverized coal boilers for power stations, and relates to a flue gas recirculation system for preventing low-temperature corrosion of pulverized coal boilers with four corners. Background technique [0002] When the boiler burns high-moisture and high-sulfur coal, the low-temperature part of the rear heating surface will be corroded, which is called low-temperature corrosion. Low-temperature corrosion usually occurs at the cold end of the air preheater and the economizer with low feed water temperature. When the temperature of the heating surface is lower than the dew point of the flue gas, the sulfuric acid formed by the combination of water vapor in the flue gas and sulfur trioxide generated after sulfur combustion will condense on the heating surface, severely corroding the heating surface. The corrosion phenomenon is also called condensation corrosion phenomenon. When there is sulfuric acid vapor in the flue ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23L15/00F23J15/02F23J11/00F23J13/00F23D1/02F23C7/00
CPCF23L15/00F23J15/02F23J11/00F23J13/00F23D1/02F23C7/00Y02E20/34
Inventor 王志刚佘园元解冰周凌宇柳宏刚成汭珅周平
Owner XIAN THERMAL POWER RES INST CO LTD
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