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 a rotary atomizer, an evaporation tower deduster, a concentrating tower and an atomizing evaporation tower; the atomizing evaporation tower is provided with a hot air distributor and an evaporation tower tank; the hot air distributor comprises an air flue and a hot air guide plate; an outlet of the air flue is communicated with an inner cavity of the evaporation tower tank; the air flue of the hot air distributor is internally provided with a rotary atomizer mounting sleeve, and the rotary atomizer mounting sleeve is internally provided with the rotary atomizer; the concentrating tower is provided with a waste water input interface, a concentrated water output interface, a concentrated flue gas inlet and a concentrated flue gas outlet; the concentrated water output interface isconnected 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 evaporation tower deduster is provided with a dedusting interface and a dust-free air discharge hole; an air outlet is connected with the dedusting interface. The device has the technicaladvantage 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

However, since the fine solid particles or salts evaporated from the crystallization tower of this process enter the fly ash, heavy metals and chloride ions in the desulfurization wastewater migrate into the fly ash, which will affect the comprehensive utilization of fly ash in power plants. Power plants with strict standards are not suitable

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