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Method for preventing resistance of air preheater from rising

An air preheater and air heating technology, applied in the field of boilers, can solve the problems of air preheater resistance rise, hardening, affecting the long-term safe operation of the boiler, etc., to avoid resistance rise and prolong the operation period.

Inactive Publication Date: 2016-10-26
新疆宜化化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The temperature of the boiler flue gas is 380 degrees before it enters the air preheater from the economizer. The original design temperature drops to 130 degrees after passing through the air preheater. During the cooling process, due to the lower temperature, the boiler flue gas The calcium sulfate, sodium sulfate and other metal oxides entrained in the flue gas are easy to react with the water vapor in the flue gas to form hydrates, thereby compacting and hardening, often causing the resistance of the air preheater to rise, affecting the long-term safe operation of the boiler

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] A method to prevent the resistance of the air preheater from rising. The air sent into the air preheater is heated to 40°C, and then sent into the air preheater. The heated air in the air preheater and the boiler flue gas generate After heat exchange, the boiler flue gas is discharged through the flue gas outlet of the air preheater, and the temperature of the boiler flue gas discharged through the flue gas outlet of the air preheater is 160°C.

Embodiment 2

[0012] A method to prevent the resistance of the air preheater from rising. The air sent into the air preheater is heated to 60°C, and then sent into the air preheater. The heated air in the air preheater and the boiler flue gas generate After heat exchange, the boiler flue gas is discharged through the flue gas outlet of the air preheater, and the temperature of the boiler flue gas discharged through the flue gas outlet of the air preheater is 178°C.

Embodiment 3

[0014] A method to prevent the resistance of the air preheater from rising. The air sent into the air preheater is heated to 80°C, and then sent into the air preheater. The heated air in the air preheater and the boiler flue gas generate After heat exchange, the boiler flue gas is discharged through the flue gas outlet of the air preheater, and the temperature of the boiler flue gas discharged through the flue gas outlet of the air preheater is 194°C.

[0015] Adopt the method that embodiment 1-embodiment 3 of the present invention provides to carry out test respectively, test result proves, sulfate hydrate no longer produces hardening and hardening, can't be deposited on the air preheater, and the phenomenon of dust accumulation in air preheater is obvious Reduced, thus effectively avoiding the increase in the resistance of the air preheater. After one year of operation, the resistance basically does not change. There is no need to stop the furnace for cleaning, which ensures ...

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Abstract

The invention relates to the technical field of boilers, and particularly discloses a method for preventing resistance of an air preheater from rising. The method comprises the steps that air supplied to the air preheater is heated till the temperature ranges from 40 DEG C to 80 DEG C, and then the air is supplied to the air preheater; heat exchange happens to the air heated in the air preheater and boiler smoke; and then the boiler smoke is exhausted out from a smoke outlet of the air preheater, and the temperature of the boiler smoke exhausted at this moment is improved to 160 DEG C-200 DEG C from previous 130 DEG C. The smoke temperature of the smoke outlet of the air preheater is improved, and therefore sulfate aquo-complex is decomposed at the temperature, cannot be hardened and cannot deposit on the air preheater, then the resistance of the air preheater is effectively prevented from rising, and the operation cycle of a boiler is prolonged.

Description

technical field [0001] The invention relates to the technical field of boilers, in particular to a method for preventing the resistance increase of a boiler air preheater. Background technique [0002] The temperature of the boiler flue gas is 380 degrees before it enters the air preheater from the economizer. The original design temperature drops to 130 degrees after passing through the air preheater. During the cooling process, due to the lower temperature, the boiler flue gas The calcium sulfate, sodium sulfate and other metal oxides entrained in the flue gas are easy to react with the water vapor in the flue gas to form hydrates, thereby compacting and hardening, often causing the resistance of the air preheater to rise, affecting the long-term safe operation of the boiler . Contents of the invention [0003] The object of the present invention is to provide an effective method for preventing the resistance rise of the air preheater, so as to ensure the long-term safe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F28F19/00F23L15/00
CPCF23L15/00F28F19/00Y02E20/34
Inventor 蒋远华李锐胡智李天方马会芹杨传明陶建彬张书培杨培俊王炎来
Owner 新疆宜化化工有限公司
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