Method for prolonging service life of boiler denitration system catalyst

A catalyst life and catalyst technology, applied in chemical instruments and methods, separation methods, dispersed particle separation, etc., can solve the problems of difficult post-processing of spent catalysts, heavy workload of replacing catalysts, high cost of catalysts, etc., to avoid damage to catalysts, Avoid incomplete combustion, the effect of low carbon content in fly ash

Inactive Publication Date: 2015-08-19
冯伟忠
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

However, the cost of the catalyst itself is very high. For a 1000MW boiler, the SCR catalyst is designed in three layers. For the first time, two layers of catalysts are installed. After 2-3 years of operation, one layer needs to be replaced (added) every year. Tens of millions of RMB
This makes the operating cost of the power plant greatly increased, the workload of replacing the catalyst is heavy, and the post-processing of the spent catalyst is also difficult.
[0003] In fact, the above-mentioned physical phenomena, especially the high-carbon soot adhering or even accumulating in the tail area of ​​the boiler, such as air preheater, dust collector, etc., and then there are frequent accidents of equipment damage or even scrapping due to the reburning of combustibles occur

Method used

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Experimental program
Comparison scheme
Effect test

specific Embodiment 1

[0023] In step a1), the external heat source is hot air from an air preheater of an adjacent boiler. Specifically, the hot air from the outlet of the air preheater of the adjacent boiler is introduced into the smoke side outlet of the economizer of this boiler, so as to directly heat the catalyst of the denitrification system until the temperature reaches above the dew point temperature of the flue gas; the adjacent boiler can also be The hot air from the outlet of the air preheater is introduced into the air side outlet of the air preheater of the boiler. After entering the furnace, the hot air first heats the convection heating surface of the boiler, and then flows out of the economizer to heat the denitrification catalyst. until the temperature reaches above the dew point temperature of the flue gas.

specific Embodiment 2

[0024] In step a1), the heat source comes from the steam of the adjacent boiler, which heats the feed water of this boiler, thereby heating the economizer. Specifically, the steam from the adjacent boiler is introduced into the deaerator and high-pressure feed water heater of the boiler through the pipeline, thereby heating the boiler feed water, and the boiler feed water enters the economizer of the boiler after being heated by the deaerator and high-pressure heater, thereby heating Economizer.

[0025] Step a) also includes step a2), starting the fan. The air flowing through the economizer is heated when the fan is activated. Wherein, in step a2), the heated air flowing through the economizer flows through and heats the catalyst surface of the denitrification system and the air preheater. Then, the boiler inlet air is heated by the air preheater. Wherein, the heated boiler intake air enters the economizer and continues to be heated, thereby creating a virtuous cycle, and ...

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Abstract

The present invention discloses a method for prolonging the service life of a boiler denitration system catalyst. The method comprises a) increasing the denitration system catalyst surface temperature before starting boiler ignition, wherein the denitration system catalyst surface temperature in the step a) is increased to more than or equal to the flue gas dew point temperature, and the step a) comprises a step a1) introduction of an external heat source into the boiler so as improve the denitration system catalyst surface temperature to more than or equal to the flue gas dew point temperature.

Description

technical field [0001] The invention relates to the field of thermal power generation, in particular to a method for prolonging the service life of a catalyst in a denitrification system of a thermal power generating set. Background technique [0002] Today, as energy consumption continues to grow, the task of energy conservation and emission reduction is becoming increasingly heavy, and coal-fired thermal power plants are major pollutant emitters. Flue gas desulfurization and denitrification in thermal power plants have become an important task for environmental protection in my country. For denitrification technology, The selective catalytic reduction reaction (SCR) method is the most widely used and most mature flue gas denitrification technology in the world. It uses a reducing agent to selectively react with nitrogen oxides in the flue gas under the action of a catalyst. This produces nitrogen and water. However, the existing SCR method generally has the problem of short...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/86B01D53/56
Inventor 冯伟忠
Owner 冯伟忠
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