Device for homogenizing flue gas velocity at ammonia spraying cross section in denitration flow field

Abstract

The invention provides a device for homogenizing flue gas velocity at an ammonia spraying cross section in a denitration flow field. The device includes a connecting flue from a coal economizer outletto an SCR reactor inlet. The connecting flue includes an equal-cross-section advection section, a variable-section advection section, a turning chamber, a rising section, and a section from the top of the rising section to the SCR reactor inlet. The flow field of the connecting flue from the coal economizer outlet to the SCR reactor inlet is effectively optimized, and in particular, flue gas flowing at the ammonia spraying cross section of the rising section is effectively improved, thus homogenizing flue gas velocity at the ammonia spraying cross section in the denitration flow field, and making the relative standard deviation of flue gas velocity distribution small, and therefore, the difficulty in adjusting adjustable ammonia spraying grids in an ammonia spraying zone is reduced, consistency of the ammonia-nitrogen ratio of the ammonia spraying cross section is improved, and further problems that ammonia escape of an SCR denitration device is high, a downstream air pre-heater is blocked with ammonium bisulfate, and the like which are caused by nonuniform distribution of the ammonia-nitrogen ratio can be solved.

Description

technical field [0001] The invention relates to a flue gas velocity homogenization device, in particular to a device with simple and reliable structure, ingenious design and good flue gas velocity homogenization effect to homogenize the flue gas velocity in the ammonia injection section of the denitrification flow field. Background technique [0002] From July 1, 2014, all thermal power plants across the country began to implement flue gas denitrification mandatory; among them, SCR flue gas denitrification is the most widely used denitrification technology. With the widespread operation of SCR denitrification devices, some problems have gradually emerged; among them, the blockage of ammonium bisulfate in the air preheater downstream of SCR caused by the high ammonia escape of SCR denitrification devices, which makes the thermal power plant unable to operate at full load, is the most urgent need to solve one of the problems. [0003] The SCR denitrification device is general...

AI Technical Summary

Problems solved by technology

The invention can solve the problem of high ammonia escape in the SCR denitrification device caused by the uneven distribution of the ammonia-nitrogen ratio

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