Ammonia-spraying mixing system utilizing external filtration type dust remover air purifying chamber structure

Abstract

The invention relates to an ammonia-spraying mixing system utilizing external filtration type dust remover air purifying chamber structure. The ammonia-spraying mixing system comprises an ammonia-spraying grille 1, a gas purifying chamber 2 of an external filtration type dust remover, a filter element 9 and a spray-blowing pipe 11, wherein the ammonia-spraying grille 1 is composed of a main ammonia gas pipe assembly 3 and branch ammonia gas pipes 4. The branch ammonia gas pipes 4 are provided with ammonia gas spraying nozzles 5, and each of the branch ammonia gas pipes 4 is correspondingly provided with an adjusting valve 7 and a detecting instrument set 8. The gas purifying chamber 2 of the external filtration type dust remover comprises a limited space formed by a wall of the gas purifying chamber and a pattern board 10, the filter element 9 is installed on a pattern board orifice 12 of the dust remover pattern board 10, and the spray-blowing pipe 11 is arranged above the filter element 9. The system fully utilizes the inherent limited space structure, internal members and spray-blowing pipe installing layer of the gas purifying chamber as a static mixer, and device investment is saved. The device resistance produced by adding the static mixer is avoided. The ammonia-spraying grille is installed in the air purifying chamber having a large cross section and a relatively lower flue gas flowing speed, system resistance increase is smaller, and the energy consumption of system operation is reduced.

Description

technical field [0001] The invention belongs to the technical field of flue gas purification, and in particular relates to an ammonia injection mixing system utilizing the structure of a clean gas chamber of an external filter type dust collector. Background technique [0002] Nitrogen oxides are extremely harmful to the environment. It is not only one of the main substances that form acid rain, but also an important substance that forms photochemical smog in the atmosphere and an important factor that depletes ozone. Industrial high-temperature flue gas mainly uses reducing agents (ammonia, urea, alkanes, etc.) to chemically react with nitrogen oxides to reduce nitrogen oxides. The reducing agent is mostly ammonia, so as to achieve the purification of nitrogen oxides in the flue gas. Select Sexual catalytic reduction process (SCR) is one of the main technologies. [0003] Nitrogen oxides are extremely harmful to the environment. It is not only one of the main substances th...

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Problems solved by technology

[0004] The document of patent publication number CN205435252U discloses an integrated dedusting, denitrification and desulfurization device, which combines the ammonia injection system with the pulse cleaning system, and replaces the compressed air for cleaning the filter bag with ammonia. Intermittent cleaning, local filter elements, and pulse injection of ammonia gas can neither ensure the continuous supply of ammonia gas nor ensure the uniform and metered injection of ammonia gas into flue gas. Uneven mixing of flue gas will lead to unstable denitrification efficiency. high escape rate

[0005] Patent Publication No. CN205307996U discloses an integrated device for dust removal and denitrification. The ammonia injection grid is directly arranged on the upper part of the catalyst module, the mixing length is short, and there is no flue gas mixer, which cannot achieve good mixing of reducing agent and flue gas nitrogen oxides. , resulting in low denitrification efficiency and low ammonia escape rate

[0006] Patent Publication No. CN105107349A discloses a coke oven flue gas desulfurization and denitrification combined purification process device. The upper box of the dust collector is extended as a denitrification reactor, and the reducing agent injection grid is placed at the entrance of the denitrification catalyst module. No smoke is installed. Gas mixer, due to the large passage area of ​​the upper box, the low flow rate of the flue gas, the mixing effect of the reducing agent and the flue gas is even worse

[0007] The above three patent documents are typical processes for the integration of dust removal and denitrification. If a static mixer is added, the flue needs to be increased, and the operating resistance of the system will increase.

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