Device and method for treating power plant waste water

Abstract

The invention provides a device for treating power plant waste water, aiming at solving the technical problem of how to achieve zero emission of the power plant waste water. The device has a structurecomprising an atomizing evaporation tower provided with a flue gas distributor and an evaporation tower tank; the evaporation tower tank is provided with a flue gas outlet and an ash discharge hole;the flue gas distributor is arranged on the top or the side wall of the evaporation tower tank; the flue gas distributor comprises a flue and a flue gas guide plate; the flue is communicated with an inner cavity of the evaporation tower tank; the flue of the flue gas distributor is internally provided with a rotary atomizer mounting sleeve; the rotary atomizer mounting sleeve is internally provided with a rotary atomizer; the rotary atomizer is communicated with the inner cavity of the evaporation tower tank; a concentrating tower is provided with a waste water input interface, a concentratedwater output interface, a concentrated flue gas inlet and a concentrated flue gas outlet; the concentrated water output interface is connected with the rotary atomizer in a sealing way by means of a pipeline; the concentrated flue gas inlet and the concentrated flue gas outlet are connected with a power plant flue gas discharge pipeline. The device has the technical advantage of realizing zero emission of the power plant waste water.

Description

technical field [0001] The invention relates to the technical field of flue gas desulfurization wastewater treatment, in particular to a power plant wastewater treatment device and method. Background technique [0002] Although the wet desulfurization process in the prior art can solve the basic technical problems of electric field wastewater treatment, the operation steps are too complicated, and the treatment process requires a lot of manpower and material resources, resulting in high sewage treatment costs, which cannot be ignored in thermal power operation management. economic burden. [0003] Chinese patent CN 106167283A provides a coal-fired power plant desulfurization wastewater flue spray evaporation zero-emission treatment device and method, including hot flue gas distribution components, desulfurization wastewater atomization components and hot secondary air injection components, through which the desulfurization The salt in the wastewater is crystallized and drie...

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Problems solved by technology

[0002] Although the wet desulfurization process in the prior art can solve the basic technical problems of electric field wastewater treatment, the operation steps are too complicated, and the treatment process requires a lot of manpower and material resources, resulting in high sewage treatment costs, which cannot be ignored in thermal power operation management. economic burden

[0003] Chinese patent CN 106167283A provides a coal-fired power plant desulfurization wastewater flue spray evaporation zero-emission treatment device and method, including hot flue gas distribution components, desulfurization wastewater atomization components and hot secondary air injection components, through which the desulfurization The salt in the wastewater is crystallized and dried to achieve zero discharge of desulfurization wastewater under high load and simultaneously remove Hg in the flue gas; The temperature is low; for renovation projects or projects with low-temperature economizer installed, due to the short length of the available flue, the evaporation is not complete, which will further lead to dust accumulation and corrosion

Chinese patent CN 107089755A provides a zero-discharge system device for desulfurization wastewater evaporated by a drying tower after concentration, including a pretreatment unit, a membrane concentration unit, and an air preheater bypass drying unit, through which the desulfurization wastewater is evaporated to achieve wastewater Zero emission, but due to the use of a membrane concentration unit in this process, the system is complex and the investment cost is high, and the reverse osmosis membrane used needs to be replaced regularly, and the operating cost is high; at the same time, it is required to set up a pretreatment unit before the membrane concentration, which further increases the cost. Investment cost and operating cost, poor economy, and will generate new waste sludge, difficult to promote

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