Whole wing type current sharing and partition adjustable ammonia-gas spraying device

Abstract

The invention provides a whole wing type current-sharing and division adjustable ammonia injection device which includes a horizontal rectangle flue and a group wing element uniform distributed in a cross section. A nozzle main communicated with an ammonia gas channel is set inside each wing element, flue is divided into multi-slit airflows when flows through the nozzle main and the wing element, the slit airflow flows through a rectangle larynx aperture constituted of two adjacent wing elements and half rectangle laryna aperture constituted of flue wall and wing element in exterior two sides, an ammonia down nozzle and an ammonia upper nozzle that is even arranged along flue flow direction on the larynx aperture center line. The ammonia injection section composed of the wing element can resist charge variability because of even flue flow field, better flow field distribution stability, easy obtaining and ensuring uniformity of ammonia injection. Flue of larynx aperture provides power for mixing down stream ammonia gas and flue after being accelerated and reduces distance needed by mixing ammonia gas and flue greatly.

Description

technical field [0001] The invention relates to a key technology in the high-temperature and high-dust flue gas denitration system of a coal-fired boiler, that is, a device for injecting ammonia gas into the flue gas upstream of the denitrification reactor of the flue gas denitrification system, and specifically relates to an integral airfoil Ammonia injection device with adjustable flow and partition. Background technique [0002] Ammonia is the most commonly used reducing agent in the high-temperature and high-dust flue gas denitrification system of coal-fired boilers. The ammonia injection system is located upstream of the denitrification reactor. The traditional commonly used injection system is the ammonia injection grid, which consists of a feed main pipe and several connecting pipes, each connecting pipe supplies ammonia to a distribution pipe. The distribution pipe feeds several spray pipes equipped with nozzles. The nozzles are arranged in a row on the cross-sect...

AI Technical Summary

Problems solved by technology

The disadvantage is that this method injects ammonia gas through a small amount of large nozzles and uses vortex for mixing. The amount of ammonia sprayed by each nozzle is large, and the distance required for uniform mixing completely depends on vortex, which requires L / D=1.5 -3 geometric dimensions, which cannot be satisfied in many applications

[0004] To sum up, the traditional two ammonia injection systems either have the disadvantages that the nozzles are easily blocked and the adjustment is complicated, or the adjustment is simple but requires a long mixing distance, which is usually difficult to achieve in practical applications.

Images