Device and method for treating evaporation and desulfurization waste water of high-temperature flue gas

Abstract

The invention discloses a device and a method for treating evaporation and desulfurization waste water of high-temperature flue gas and belongs to the field of treatment of industrial waste water. Thedevice comprises an SCR (selective catalytic reduction) catalytic denitration system, an air preheater, an electrostatic precipitator, an induced draft fan, a wet desulfurization absorption tower anda chimney which are connected in sequence, wherein a desulfurization waste water storage box is connected with the bottom of the wet desulfurization absorption tower and connected to a water inlet inthe top of an evaporation tower through a water pump; a high-flow gas inlet and a low-flow gas inlet are formed in the top and the bottom of the evaporation tower respectively; the two gas inlets areconnected with a gas diverter outlet respectively, and a gas diverter inlet is connected with the induced draft fan and a gas flue between the SCR catalytic denitration system and the air preheater;a gas outlet formed in the middle of the evaporation tower is connected with a gas flue between the air preheater and the electrostatic precipitator through a gas outlet pipeline. According to the device and the method, the evaporation effect is improved, energy consumption is reduced, content of gaseous chlorine at the outlet of the evaporation tower is reduced, and safe and stable operation of follow-up equipment is facilitated.

Description

technical field [0001] The invention relates to the field of industrial wastewater treatment, in particular to a desulfurization wastewater treatment device and a treatment method thereof. Background technique [0002] Limestone / gypsum wet desulfurization process, as the mainstream desulfurization technology in coal-fired power plants, has the advantages of high desulfurization efficiency, mature technology, stable operation and convenient maintenance. However, in order to maintain stable and reliable operation of the slurry circulation system, a certain amount of desulfurization wastewater needs to be discharged regularly . The "Guidelines for Feasible Technologies for Pollution Prevention and Control in Thermal Power Plants" officially implemented in June 2017 clearly stated that, in addition to desulfurization wastewater, all types of wastewater after treatment can basically achieve "multiple uses of one water, cascade utilization", and the wastewater will not be discharg...

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Problems solved by technology

The equipment in this patent solves some of the problems in the above three patents, but the evaporation effect is still not ideal, and the ash hopper at the bottom of the wastewater evaporation tower is prone to water droplets

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