Coal-fired boiler flue gas denitration system

Abstract

The invention provides a coal-fired boiler flue gas denitration system. The coal-fired boiler flue gas denitration system comprises a boiler furnace, and a cyclone separator arranged on a flue gas outlet of the boiler furnace in a connected mode. The cyclone separator is connected with an economizer device, the economizer device comprises a superheater, a high-temperature economizer, a flue gas guiding device, an ammonia spraying grid, a catalysis module, a low-temperature economizer and an air preheater, all of which are sequentially arranged from top to bottom, and an outlet of the air preheater is connected with a spiral-flow type dehydrator. The coal-fired boiler flue gas denitration system is good in denitration effect and water removal effect.

Description

Technical field [0001] The invention relates to a coal-fired boiler flue gas denitration system. Background technique [0002] The upgrading and upgrading of the existing coal-fired boiler flue gas denitrification system is bound to become a new round of environmental protection needs in the thermal power industry. In particular, the use of circulating fluidized bed boilers with strong coal type adaptability and the relatively low investment and construction cost of SNCR flue gas denitrification process are used more heavily, which can basically meet the emission requirements of NOx concentration less than 100mg / Nm3. However, the SNCR denitrification system consumes a lot of materials, the stability of operation is greatly affected by the change of the boiler load and coal type, the influence of the incompletely reacted excessive reducing agent NH3 on the heating surface of the boiler tail flue and other objective factors, as well as the coal burning in key areas The boiler is a...

AI Technical Summary

Problems solved by technology

However, the material consumption of the SNCR denitrification system is large, the stability of operation is greatly affected by the change of boiler load and coal type, the impact of incompletely reacted excessive reducing agent NH3 on the heating surface of the boiler tail flue, and other objective factors, as well as coal-fired coal in key areas Boilers are about to implement stricter policy requirements such as NOx emission limit of 50mg / Nm3

[0003] Moreover, the current denitrification tower with integrated smoke tower is affected by the structural stability, and the discharge port of the steel chimney on the top of the tower is much lower than the height of the original concrete chimney.

The small droplets entrained by the clean flue gas will have a great impact on the surrounding environment after landing. Some immature design of the smoke tower integrated denitrification tower, its vicinity is like light rain

Images