Overview of the zero discharge process of desulfurization wastewater in power plants-Ocpuritech-img

Overview of the zero discharge process of desulfurization wastewater in power plants?

by:Ocpuritech     2021-03-26
An overview of the process of desulfurization wastewater zero emissions power plant Author:? Currently, dosing flocculating most wet FGD waste water treatment system of domestic thermal power plants will be adopted, but overall it is put into operation rate is very low, the country is now desulfurization wastewater The selection of the treatment process will be based on the national emission standards. In order to deepen your understanding, today I will take you to take a look at the types of zero discharge processes for desulfurization wastewater. 1. Steam evaporation process Zero discharge of desulfurization wastewater The steam evaporation process means that after desulfurization wastewater is pretreated, the water in the desulfurization wastewater is evaporated to dryness by the heat of steam to achieve zero discharge of desulfurization wastewater. The conventional process route of this technology is: pretreatment + membrane concentration + evaporation crystallization (MVR or MED). The steam evaporation process can achieve zero discharge of desulfurization wastewater, and there have been successful engineering cases in China. However, this method also has many shortcomings: due to the membrane concentration and evaporation crystallization process, the entire system occupies a large area, and the investment cost and operating cost of this process are high. In addition, the salt produced by evaporation crystallization is generally hetero salt, which is difficult It is difficult to deal with when it is reused. 2. Flue gas evaporation process Desulfurization wastewater zero discharge Flue gas evaporation process refers to the process of evaporating the moisture in the desulfurization wastewater by the heat of the flue gas generated by the boiler, and the ash produced after the evaporation is processed together with the dust collector to achieve zero desulfurization wastewater. emission. According to different sources of flue gas, the process can be divided into high-temperature flue gas evaporation and low-temperature flue gas evaporation. High-temperature flue gas evaporation means that a part of high-temperature flue gas is drawn from the front of the air preheater to evaporate the desulfurization wastewater. The evaporated flue gas enters the flue before the dust collector, and the generated dust is removed by the dust collector to achieve zero emission; Gas evaporation refers to the process of spraying the desulfurization wastewater into the low-temperature flue between the air preheater and the dust collector to evaporate the desulfurization wastewater, and the generated dust is collected by the subsequent dust collector to achieve zero discharge of the desulfurization wastewater. The characteristics of the flue gas evaporation process are that the entire system is relatively simple, the area is small, and the investment and operating costs are low; there are many process routes, and different process routes can be selected for different operating conditions; the dust generated after evaporation can be removed by subsequent dust The device removes, no secondary pollutants are produced. However, the flue gas evaporation process has higher requirements for process design. If the design is not good, there will be problems such as fouling and corrosion of the flue. The content of the zero-discharge desulfurization wastewater process has been introduced for you today. I hope it will be helpful to you. Users can choose the process that suits them according to their actual conditions.
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