Method for efficiently spraying, evaporating and coring desulfurization wastewater in thermal power plant

Abstract

The invention discloses a method for efficiently spraying, evaporating and coring desulfurization wastewater in a thermal power plant. The method comprises the following steps: introducing desulfurization wastewater into a wastewater flowing channel, mixing dust-containing fume with additives, subsequently introducing into an inner side air flue, introducing compressed air of high pressure and high flow velocity into an outer side air flue, after the desulfurization wastewater is sprayed, firstly, mixing with ejected dust-containing fume and the additives for chemical reaction subsequently, further crushing and atomizing the desulfurization wastewater by high-speed air ejected from the outer side flue, and further feeding into the flue for evaporating and coring. The method adopts an inner / outer side flue mode, the desulfurization wastewater is firstly subjected to chemical reaction with the mixture of the dust-containing fume and the additives to form sediment particles, furthermore the coring effect of the dust particles and the sediment particles in the fume is utilized to enhance atomization, evaporation and crystallization coring of wastewater, and finally liquid drops are crushed and atomized by the high-speed air. By adopting the method, the time that the wastewater drops are evaporated and cored in the tail gas flue of a boiler is shortened, the particles after the evaporation and crystallization coring are easy to capture in a dust collector, and thus zero emission of desulfurization wastewater is achieved.

Description

technical field [0001] The invention relates to a high-efficiency spray evaporation nucleation method for thermal power plant desulfurization wastewater, which is mainly applicable to the treatment of thermal power plant flue gas wet desulfurization wastewater. Background technique [0002] A certain amount of desulfurization wastewater is produced during the limestone-gypsum wet flue gas desulfurization process. Compared with the general industrial wastewater of thermal power plants, the water quality is special, mainly in the following aspects: (1) The wastewater is weakly acidic, PH is 4-6; (2) The content of suspended solids is high, but the particles are fine, and the main component is gypsum, followed by fly ash from flue gas, calcium carbonate and calcium sulfite added in the desulfurization process; (3) Wastewater Contains soluble chlorides, fluorides, etc., and the fluoride content generally exceeds 50mg / L; (4) Wastewater contains heavy metal elements such as Pb, Cd...

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Problems solved by technology

[0011] However, due to the relatively low temperature of the flue gas at the tail of the boiler, a longer flue is required after spraying the flue at the tail of the boiler in the above invention patents so that the droplets after the atomization of the wastewater are completely evaporated and crystallized to nucleate, while the actual flue at the tail of the boiler The distance is very limited. Before entering the dust collector, if the droplets are not completely evaporated and nucleated, it will cause problems such as dust accumulation in the dust collector and reduced dust removal efficiency.

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