Longitudinal-vortex-type ammonia-injection mixing arrangement used for SCR denitration system

Abstract

The invention discloses a longitudinal-vortex-type ammonia-injection mixing arrangement used for an SCR denitration system. The mixing arrangement comprises static mixing units including fins and substrate flats and ammonia injection pipes provided with ammonia injection holes. The ammonia injection pipes are vertical to a flow direction of flue gas and pass through gas duct arrangement in an SCR denitration system. One static mixing unit corresponding to one ammonia injection hole is arranged. The injection direction of the ammonia injection holes and the flow direction of flue gas coincide or have included angles of 0-90 degrees. The substrate flats are vertically fixed on the ammonia injection pipes, and the fins are fixed on the substrate flats. The fins and the substrate flats have included angles of 30-90 degrees, and the attack angles between the fins and the flow direction of flue gas is more than 0 degree and is in a range of 0 to 60 degrees. Each fin is correspondingly arranged on the ammonia injection pipes in a downstream direction of the flow direction of flue gas. Ammonia enters the gas duct through the ammonia injection holes, and when ammonia and flue gas flow through the fins, a longitudinal vortex for secondary entrainment mixing is formed. The arrangement is good in mixing effect and uniform in ammonia nitrogen mixing, the distance required for uniform mixing is shortened, and the space utilization efficiency is increased.

Description

technical field [0001] The invention relates to the field of flue gas purification of large-scale power plant boilers, in particular to a vertical vortex ammonia injection mixing device used in an SCR denitrification system. Background technique [0002] As human beings pay more and more attention to environmental issues, reducing pollutant emissions in the process of coal-fired power generation in large-scale power plant boilers has become an important control goal of China's air pollution control. Nitrogen oxides (NOx) released during coal combustion x ), is one of the main sources of pollution that causes damage to the ecological environment in my country. Selective catalytic reduction technology (SCR) has the advantages of high denitrification efficiency, relatively mature process, and no secondary pollution, so it has become the most widely used and most effective flue gas denitrification technology in the world. The main principle is to use liquid ammonia or ammonia ...

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problems existing in the prior art, the present invention provides a vertical vortex ammonia injection mixing device for SCR denitrification system, which solves the problem of uneven mixing of ammonia and nitrogen caused by entrainment lateral velocity in the prior art

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