Method for prolonging service life of boiler denitration system catalyst

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...

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