Utilize flue gas evaporation concentration device and desulfurization wastewater treatment system

Abstract

The invention provides a flue gas evaporation and concentration device, which includes a tower body, a sedimentation tank and a spray assembly are arranged in the tower body, and a clear liquid tank for receiving the overflow liquid of the sedimentation tank is also arranged in the tower body , the spray assembly is connected to the clear liquid tank through a pipeline, and a liquid inlet, a liquid outlet, a flue gas inlet and a flue gas outlet are arranged on the tower body, and the liquid inlet and the sedimentation tank are connected through a pipeline connected, the liquid outlet is connected to the clear liquid pool, the flue gas inlet is located below the spray assembly, and the flue gas outlet is located at the top of the tower body; it also relates to a desulfurization wastewater treatment system, including the above-mentioned device. In the device of the present invention, the desulfurization wastewater is first precipitated, recirculated, sprayed, and flue gas is heat-exchanged and concentrated, which can avoid the problem of concentration and scaling of the desulfurization wastewater, and can form the purification of the flue gas to ensure the humidity of the flue gas entering the desulfurization tower.

Description

technical field [0001] The invention relates to energy saving and environmental protection, in particular to a flue gas evaporation concentration device and a desulfurization wastewater treatment system. Background technique [0002] At present, in the wet flue gas desulfurization process of coal-fired power plants and industrial kilns, in order to remove pollutants such as acid gas and dust in the flue gas, it is necessary to regularly discharge wastewater and supplement limestone slurry. The discharged wastewater is desulfurization wastewater. Desulfurization wastewater has the characteristics of acidity, high content of suspended solids, high content of heavy metals, and high content of soluble chloride. At present, the most common treatment method for desulfurization wastewater in China is the chemical precipitation method, that is, the "triple box" process , using physical and chemical methods to remove most of the suspended solids and heavy metals through neutralizatio...

AI Technical Summary

Problems solved by technology

Among them, flue evaporation (including bypass flue evaporation) has the problem that the amount of desulfurization wastewater is too large to consume too much flue gas heat and affect the coal combustion efficiency of the boiler, that is, the total amount of desulfurization wastewater evaporated by the flue is limited.

Using the heat exchanger concentration and crystallization method to treat desulfurization wastewater has the problems of corrosion damage of the heat exchanger and low heat transfer efficiency after scaling.

At the same time, the waste heat of the flue gas in the flue enters the desulfurization tower from the dust collector, and is wasted by evaporating water. In addition, it is necessary to increase the water supply of the desulfurization tower for the normal operation of the desulfurization tower, resulting in high water and operating costs.

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