Boiler denitration integrated system

Abstract

The invention provides a boiler denitration integrated system which comprises a flue, ammonia water ejectors are symmetrically arranged on the side wall of the flue, and a turbulent flow pipe, a rectification grid, a catalyst hoisting rail, a soot blower and a catalyst module are arranged in the flue and located below the ammonia water ejectors from top to bottom. Ammonia gas and nitrogen oxide can fully react, the mixing effect of flue gas in the central area of the flue is enhanced, and the denitration effect is improved.

Description

technical field [0001] The invention belongs to the technical field of flue gas denitrification of waste heat boilers, and more particularly relates to a boiler denitration integrated system. Background technique [0002] Nitrogen oxide NOx (NO, NO 2 , N 2 O, etc.) is one of the main pollutants in the global atmosphere, which causes environmental problems such as smog, acid rain, and ozone layer destruction in the atmospheric environment, which seriously affects the living environment of human beings. At present, there are two widely recognized flue gas denitrification technologies in the world, selective non-catalytic reduction flue gas technology (SNCR) and selective catalytic reduction flue gas technology (SCR). Among them, the SNCR method needs to be carried out at a high temperature of 800-1200 °C, and the denitration efficiency is 30%-60%; the SCR method can be carried out at a low temperature of 200-450 °C, and its denitration efficiency can reach 80%-90%. However,...

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Problems solved by technology

The nozzle for injecting ammonia gas is arranged horizontally. The injected ammonia gas is in the same direction as the flue gas flow (downstream). The flue at the rear of the nozzle is divided by a partition to form two flue gas flow channels, which turn into the mainstream flue area and flow into the mainstream flue area. There is no mixing part in the flow channel in front of the area, there is uneven mixing of ammonia gas and flue gas, and it is difficult to change the flow direction, which increases the flow resistance

[0004] The invention patent with application number 201810931457.2 discloses an integrated desulfurization and denitrification system, and proposes an integrated device that flows from the side wall at the bottom of the device to undergo desulfurization and then denitrification treatment. The amount of sulfur generated, but the desulfurization ambient temperature is low, while the denitrification ambient temperature is high, desulfurization and then denitrification need to heat the flue gas again, and the denitrification nozzles are arranged horizontally in the flue for heating, and the injected ammonia gas and flue gas form Downstream, there will be problems of poor mixing effect and increased ammonia escape

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