A pre-injection ammonia system and process for activated carbon desulfurization and denitrification

Abstract

The invention provides an ammonia pre-spraying system and process for desulfurizing and denitrating activated carbon. The ammonia pre-spraying system comprises an ammonia pre-spraying device and an adsorption tower; the ammonia pre-spraying device comprises an ammonia pre-saturation bin, the activated carbon pre-arranged in the ammonia pre-saturation bin adsorbs ammonia gas entering the ammonia pre-saturation bin to obtain ammonia pre-saturated activated carbon, the adsorption tower is provided with an activated carbon inlet, the ammonia pre-saturated activated carbon from the ammonia pre- spraying device enters the adsorption tower through the activated carbon inlet, and the adsorption tower is used for flue gas desulfurization and denitration reactions. The ammonia pre-spraying process for desulfurizing and denitrating the activated carbon adopts the combination of the ammonia pre-spraying device and an ammonia spraying section to form a combined cooperative denitration process, andthe activated carbon is subjected to ammonia pre-saturation treatment before entering the adsorption tower, so that denitration efficiency is further improved, ammonia escape can be controlled, ammonia consumption is saved, and economy is improved.

Description

technical field [0001] The invention belongs to the technical field of activated carbon desulfurization and denitrification processing equipment, and in particular relates to a pre-spray ammonia system and process for activated carbon desulfurization and denitrification. Background technique [0002] At present, the activated carbon desulfurization and denitrification integrated technology is widely used in the coking industry, metallurgical industry (sintering machine, pelletizing) and other flue gas purification treatment fields. This technology can realize integrated flue gas purification functions such as desulfurization, denitration and dust removal, and sulfur resource utilization. However, with the improvement of emission standards, especially the imminent implementation of ultra-ultra-low emission standards, SO2, NO X , Dust emission concentration increased from the original requirement of 35, 50, 10 to 20, 30, 5mg / Nm 3 , put forward higher requirements for the int...

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Problems solved by technology

[0008] When export NO X Emission standards are raised. In order to improve the denitrification efficiency, it is necessary to increase the amount of ammonia injection, but the resulting problem is the increase in ammonia escape; simply increasing the amount of ammonia injection can improve the denitrification efficiency to a certain extent, and cause part of the ammonia to be unable to be absorbed by activated carbon in time. Adsorption, resulting in increased ammonia slip as the flue gas is carried out into the atmosphere

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