Zero-discharge system for desulfurization wastewater

Abstract

The invention discloses a zero-discharge system for desulfurization wastewater. The zero-discharge system comprises a boiler, a dust remover and a desulfurization tower, which are arranged in sequence; a drying tower is arranged between the boiler and the dust remover; and a rotary atomizer is arranged on the tower top of the drying tower. The rotary atomizer rotates at a high speed and wastewatergenerated by the desulfurization tower is sprayed into the drying tower by the rotary atomizer; and an air flow diversion device is arranged in the drying tower, exhaust gas generated by the boiler enters the drying tower through an exhaust gas inlet and forms a downwards rotating air flow under the diversion of the air flow diversion device, and the rotating direction of the air flow is oppositeto the rotating direction of the rotary atomizer. The zero-discharge system for the desulfurization wastewater provided by the invention is used for wastewater treatment, in which the desulfurizationwastewater is directly atomized by the rotary atomizer and instantaneously evaporated by the hot exhaust gas in the drying tower, therefore no sludge is produced and no heating is needed in the process, so that the construction cost and the running cost of the zero-discharge system for the desulfurization wastewater are greatly reduced.

Description

technical field [0001] The invention relates to a wastewater treatment system, in particular to a discharge system for desulfurization wastewater. Background technique [0002] Desulfurization wastewater is mainly the discharge water from the absorption tower in the process of boiler flue gas wet desulfurization (limestone / gypsum method). In order to maintain the balance of substances in the slurry circulation system of the desulfurization unit, prevent the soluble part of the flue gas, that is, the chlorine concentration from exceeding the specified value, and ensure the quality of gypsum, a certain amount of wastewater must be discharged from the system. The wastewater mainly comes from the gypsum dehydration and cleaning system. The impurities contained in wastewater mainly include suspended solids, supersaturated sulfite, sulfate and heavy metals, many of which are the first category of pollutants that are strictly controlled in the national environmental protection stan...

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Problems solved by technology

[0003] At present, domestic technologies for zero discharge of desulfurization wastewater mainly include membrane method + evaporation crystallization technology, flue direct injection technology and bypass flue evaporation technology, etc., but these treatment processes have problems such as high operating costs and large and complex systems.

For enterprises, high construction costs and processing costs are difficult to bear

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