Efficient ammonia mixing and spraying device for flue gas denitration system

Abstract

The invention provides an efficient ammonia mixing and spraying device for a flue gas denitration system. The device includes an ammonia spraying pipe bundle with ammonia spraying ports, and static quick mixing units; the ammonia spraying pipe bundle with the ammonia spraying ports includes an ammonia spraying pipe, the ammonia spraying pipe is connected into a denitration flue channel, the denitration flue channel is internally communicated with the multiple ammonia spraying ports, and ammonia is sprayed out through the ammonia spraying ports, wherein the opening direction of the ammonia spraying ports is the same as the flowing direction of flue gas in the denitration flue channel; the device is further provided with the static quick mixing units, and each ammonia spraying port is independently matched with one static quick mixing unit; the static quick mixing units and the ammonia spraying ports are oppositely arranged, each static quick mixing unit includes a drainage component anda basal flow choking part, and the basal flow choking parts and the drainage components are matched with each other to guide the ammonia sprayed out from the ammonia spraying ports to conduct entrainment diffusion. The efficient ammonia spraying device capable of quickly and evenly mixing is reasonable in structure and convenient to process, has less device ash deposition and small needed mixingspace for spraying, and is beneficial to quick mixing of the ammonia and nitrogen and suitable for the flue gas denitration system.

Description

technical field [0001] The invention belongs to the technical field of flue gas denitrification systems, and in particular relates to a high-efficiency mixed ammonia injection device for flue gas denitrification systems Background technique [0002] With the increasingly stringent NOx emission limits of thermal power plants in my country, Selective Catalytic Reduction (SCR) technology with high denitrification efficiency, reliable technology, simple structure and no secondary pollution has become the main choice for coal-fired power plant boilers to control NOx emissions. In the SCR flue gas denitrification system, the distribution of the ammonia nitrogen ratio at the upstream section of the first layer catalyst is an important factor determining the denitrification efficiency. The ammonia injection device and mixer are the key equipment that affect the uniformity of the ammonia-nitrogen ratio and flow field distribution. [0003] At present, the ammonia injection devices t...

AI Technical Summary

Problems solved by technology

However, the device needs to be equipped with a partition plate to divide the flue into several control areas with uniform cross-sectional area, so as to avoid the influence of lateral velocity during eddy current entrainment, and the installation work is large

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