System and method for treating tail end waste water by using smoke waste heat

Abstract

The invention discloses a system and a method for treating tail end waste water by using smoke waste heat. The system comprises a coal economizer, an air preheater, a smoke cooler, an electric deduster, a desulfurization tower, a waste water preprocessor and a waste water spraying evaporator which are communicated in sequence; a waste water pump is arranged on the pipeline for communicating the waste water processor and the waste water spraying evaporator; the smoke inlet of the waste water spraying evaporator is communicated with the pipeline between the coal economizer and the air preheater; the hot water outlet of the smoke cooler is communicated with a waste heat air heater by a circulation pump; the hot air outlet of the waste heat air heater is communicated with the air preheater. The smoke outlet of the waste water spraying evaporator is communicated with the electric deduster by the smoke cooler. The invention provides the method for treating tail end waste water by using the smoke waste heat. The smoke tampering is performed and the smoke temperature is reduced while the tail end waste water is treated, so the dedusting efficiency is improved, the low-temperature dedusting is realized, the desulfurization water consumption is reduced, the method has benefits of three aspects of energy saving, water saving and environment friendliness, and the zero emission of the waste water from a power station is truly realized.

Description

technical field [0001] The invention belongs to the technical field of flue gas waste heat utilization and terminal wastewater treatment, and in particular relates to a system and method for treating terminal waste water with flue gas waste heat. Background technique [0002] In recent years, my country has further improved the emission standards of SO2, NOx and soot from coal-fired power plants, reaching or even surpassing international advanced standards. In order to meet the emission standards, domestic and foreign power plants have adopted many new technologies in the application of electrostatic precipitators, which can improve dust removal efficiency and reduce the concentration of smoke and dust emissions under certain conditions, including flue gas conditioning and low-temperature electrostatic precipitator technologies. [0003] Flue gas conditioning adjusts the flue gas, which is essentially aimed at the dust in the flue gas. By adjusting the components and some p...

AI Technical Summary

Problems solved by technology

The investment cost of this technology equipment is high, the operation cost is high, and the cost of water treatment per ton is hundreds of yuan. There are only about 5 power plants in the world that use this technology for desulfurization wastewater treatment.

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