Desulfuration wastewater treatment device utilizing flue gas waste heat

Abstract

The invention discloses a desulfuration wastewater treatment device utilizing flue gas waste heat. The desulfuration wastewater treatment device comprises a boiler, an air pre-heater, an electric dust collector, a draught fan, a desulfuration tower and a chimney which are sequentially connected through a flue gas pipeline, and further comprises a flue gas cooler arranged on a flue gas pipeline, wherein the flue gas cooler comprises a secondary flue gas cooler arranged between the air pre-heater and the electric dust collector; a water outlet of the secondary flue gas cooler and a water inlet of the secondary flue gas cooler are sequentially connected through a second pipeline, a third pipeline, a fourth pipeline and a first pipeline; a circulating pump is arranged on the fourth pipeline; a primary heat side of the waste heat evaporator communicates with the third pipeline through a pipeline; a secondary heat side of the waste heat evaporator communicates with a waste heat separator through a pipeline; and the waste heat separator is connected with a feeding pump through a feeding pipeline.

Description

technical field [0001] The invention relates to the fields of electric power energy saving and environmental protection, in particular to a desulfurization wastewater treatment device utilizing waste heat of flue gas. Background technique [0002] As the society pays more and more attention to environmental protection, in order to protect air quality, thermal power plants basically adopt wet flue gas desulfurization technology. Among them, limestone wet desulfurization has been widely used due to its mature technology, high efficiency, and reliable operation. At present, there are wastewater discharge problems in wet desulfurization systems. After the construction of flue gas desulfurization facilities, the salt content in the discharged desulfurization wastewater usually reaches 25000-45000mg / L, even as high as 60000mg / L. Although the water balance design diagram of the Design Institute "balanced" this part of the wastewater by reusing it to achieve zero discharge of waste...

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Problems solved by technology

[0003] At present, the conventional and relatively mature desulfurization wastewater treatment method in China is to use external energy (steam or electric energy), evaporate and crystallize the surface, realize the separation of salt and water in high-salt wastewater, recycle the water, and crystallize the salt into solids (purity Highly recyclable), but this kind of desulfurization wastewater treatment method has high energy consumption and operating costs

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