System and method for removing heavy metals and chloride ions in evaporative crystallization process of desulfurization wastewater

Abstract

The invention provides a system and a method for removing heavy metals and chloride ions in an evaporative crystallization process of desulfurization wastewater. The system comprises an SCR reactor, an air preheater, a first-stage heat pipe evaporator, a second-stage heat pipe evaporator, a hot air curtain drying tower, a desulfurization wastewater storage tank and an indirect evaporative cooler.Through the first-stage heat pipe evaporator and the second-stage heat pipe evaporator, flue gas waste heat is used for carrying out two-stage evaporation and concentration on desulfurization wastewater, so that a high-quality steam heat source is saved, energy is saved, consumption is reduced, and meanwhile, any flue gas component is not changed in the flue gas cooling and heat exchange process;the indirect evaporative cooler is used for solving the problem of comprehensive utilization of steam condensation recycling, so that zero discharge of wastewater is realized, and high-quality steam condensation water is obtained without loss; the hot air curtain drying tower ensures that the flow field of high-temperature flue gas entering the hot air curtain drying tower body is uniform and stable, and eliminates the instability factor of vortex generated in the flow field.

Description

technical field [0001] The invention relates to the technical field of high-salt wastewater treatment in the process of environmental engineering treatment, in particular to a novel high-salt wastewater high-efficiency evaporation and collaborative removal of heavy metals and chloride ions zero-emission system using high-temperature flue gas waste heat and its use method. Background technique [0002] At present, the conventional process method for the treatment of coal-fired flue gas desulfurization wastewater at home and abroad is the triple box technology, that is, the desulfurization wastewater is treated through processes such as neutralization, sedimentation, flocculation, and clarification. Although this process can remove environmental hazards Larger most of the harmful substances, but cannot remove chloride ions and heavy metal ions, and discharge wastewater containing chloride ions and heavy metal ions, which has greater potential harm to the environment. [0003] ...

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to overcome the shortcomings of the existing desulfurization wastewater concentration technology and evaporation technology, such as high energy consumption rate, high operating costs, and easy structural blockage of the system.

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