Vortex combined SCR static mixer

Abstract

The invention discloses a vortex combined SCR static mixer, comprising a tip body, a plurality of arc flow deflectors with an axis where the tip body is located as a center axis, and a plurality of baffle plates uniformly distributed, with the axis as a center axis, on the lower ends of the flow deflectors, wherein the baffle plates allows flue gas to gather at an ammonia gas nozzle; the arc flow deflectors allow flue gas and ammonia gas to generate transverse speed and to spirally flow upward; and gas flow located at a central area and not directly influenced by the arc flow deflectors staggerly flows relative to peripheral gas flow after bumping onto the tip body, so flue gas and ammonia gas are mixed. The vortex combined SCR static mixer provided by the invention is beneficial for promoting diffusion of ammonia gas, greatly improves mixing effect, enhances the mol ratio uniformity of ammonia and nitrogen and exerts good effect on optimization and synergism of a 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