A swirl combined scr static mixer

Abstract

The invention discloses a swirl combined type SCR static mixer, comprising a tip body, a plurality of arc-shaped guide plates surrounding the axis where the tip body is located as the central axis, and a plurality of arc-shaped guide plates arranged at the lower end of the guide plate and connected to the above-mentioned shaft. It is a number of baffles evenly distributed on the central axis; the baffles make the flue gas converge to the ammonia gas nozzle, and the arc-shaped deflector makes the flue gas and ammonia gas generate lateral velocity and flow upward in a spiral shape, and the central area is not directly affected by the arc. The air flow affected by the deflector strikes the tip body and flows alternately with the surrounding air flow to realize the mixing of flue gas and ammonia gas. The invention is conducive to promoting the diffusion of ammonia gas, greatly enhancing the mixing effect, improving the uniformity of the ammonia-nitrogen molar ratio, and has good effects on the optimization and synergy of the SCR denitration system.

Description

technical field [0001] The invention relates to a swirl combined SCR static mixer. Background technique [0002] During the "Twelfth Five-Year Plan" period, the emission reduction work of the power production industry has achieved good results, NO x The total emission and emission performance dropped from 10.55 million tons and 2.6g / kWh in 2010 to 9.48 million tons and 2.4g / kWh respectively, but the total emission of nitrogen oxides is still huge. At the same time, in the face of the world's most stringent emission standard "Emission Standard of Air Pollutants for Thermal Power Plants" (GB13223-2011), the nitrogen oxide pollutants are required to reach 100mg / m 3 As a major emitter of nitrogen oxides, thermal power plants are still tasked with a very arduous task of reducing emissions. [0003] At present, the mainstream nitrogen oxide control technology in the thermal power industry is a combination of low-nitrogen combustion and flue gas denitrification. Among them, selec...

AI Technical Summary

Problems solved by technology

Although the static mixer of the above form can enhance the mixing effect of the reducing agent and the flue gas, it does not solve the "short circuit" problem of the flow of the flue gas against the wall. This part of the flue gas is not affected by the static mixer, and the ammonia nitrogen molar ratio is low. The denitrification effect is not ideal; at the same time, the above-mentioned static mixing also has a poor influence on the flow field in the flue due to structural reasons, resulting in uneven flow in the reactor and high local velocity, which may lead to increased catalyst wear and local dust accumulation. Phenomenon

Images