A flue gas wet desulfurization and denitrification integrated system and method

Abstract

The invention relates to a wet-type smoke desulphurization and denitrification integrated system and method. The system comprises a draught fan and a desulphurization and denitrification tower, wherein the bottom of the desulphurization and denitrification tower is provided with a water washing section, the middle part of the desulphurization and denitrification tower is provided with a desulphurization section, and the upper part of the desulphurization and denitrification tower is provided with a denitrification section; a first spraying pipe of the water washing section is connected with a water circulating system; a second spraying pipe of the desulphurization section is connected with a desulphurization liquid circulating system; a third spraying pipe of the denitrification section is connected with a denitrification liquid circulating system; the top of the desulphurization and denitrification tower is provided with a mist catcher, and is connected with a heat exchanger through a pipeline. The method comprises the steps of sending smoke subjected to heat exchange into the water washing section through the draught fan, cooling the smoke by enabling the smoke to be in contact with washing water in a countercurrent manner, and then placing the smoke into the desulphurization section for desulphurization by enabling the smoke to be in contact with sprayed desulphurization liquid in a countercurrent direction; and placing the smoke into the denitrification section for denitrification by enabling the smoke to be in contact with sprayed denitrification liquid in a countercurrent manner, removing liquid drops of the denitrified smoke through the mist catcher, sending the smoke to the heat exchanger, and discharging the purified smoke into the atmosphere through a chimney via a flue.

Description

technical field [0001] The invention relates to the technical field of flue gas treatment, in particular to an integrated process method for flue gas wet desulfurization and denitrification. Background technique [0002] SO 2 NOx and NOx are one of the main pollutants in the atmosphere and one of the main causes of acid rain and acid fog. In addition, NOx also participates in the destruction of the atmospheric ozone layer and is a greenhouse gas. With the successive implementation of "Comprehensive Emission Standards of Air Pollutants" and "Emission Standards of Air Pollutants for Thermal Power Plants", the state 2 and NOx emission requirements tend to be stricter. [0003] The integrated desulfurization and denitrification process can be divided into simultaneous desulfurization and denitrification technology and combined desulfurization and denitrification technology. [0004] Simultaneous desulfurization and denitrification technology refers to the use of a reactant i...

AI Technical Summary

Problems solved by technology

However, the desulfurization capacity of the activated carbon / activated coke method is low; the desulfurization technology of the SNRB technology can only reach 80%, and the flue gas SO 2 When the content is high, the emission requirements cannot be met; the energy consumption of the SNOX process is large, and the investment cost is high

The disadvantages of these technologies limit their universal applicability to industrial applications

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