Low-temperature evaporation and concentration system for desulfurization wastewater

Abstract

The invention discloses a low-temperature evaporation and concentration system for desulfurization wastewater. The system comprises a wastewater heating system, a wastewater flash treatment system anda flash steam suction and compression system, wherein the desulfurization wastewater flows through the wastewater heating system to be heated and then enters a spray flash mechanism of the wastewaterflash treatment system to be flashed; a flash steam pipeline of the wastewater flash treatment system is connected with the flash steam suction and compression system; the flashed steam is compressedby the flash steam suction and compression system to raise the temperature, and serves as a heat source of the wastewater heating system to be connected to the wastewater heating system; a desulfurization wastewater circulating pipeline of the wastewater flash treatment system is connected with a flue spray evaporation system by virtue of a concentrated water output pipe. The desulfurization wastewater is heated and subjected to low-temperature flash reduction, the concentrated wastewater is sprayed into the flue to be evaporated, water vapor in the wastewater is discharged into atmosphere along with the flue gas, and saline materials in the wastewater are trapped by a dust remover, therefore, zero emission of the desulfurization wastewater is realized, the operating safety of an electricprecipitator is improved, and the flashed salt-free water is recycled.

Description

technical field

[0001] The invention belongs to the field of water treatment, and relates to a low-temperature flash evaporation concentration system for desulfurization (or salt-containing) waste water. Background technique

[0002] In order to meet the national requirements for ultra-low SO2 emissions, domestic power plants or other coal-fired equipment mostly adopt limestone-gypsum wet flue gas desulfurization technology, which produces serious wastewater discharge while desulfurizing efficiently. In April 2015, the State Council issued the "Water Pollution Action Plan" to strengthen the prevention and control of various types of water pollution. Due to the complex composition of desulfurization wastewater (including suspended solids, fluoride, heavy metals and salt, etc.) highly anticipated.

[0003] At present, most of the desulfurization wastewater treatment adopts the process of chemical precipitation (traditional three-box method) to remove desulfurization wastewate...

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