Spray evaporation treatment method of wet method flue gas desulfurization wastewater in thermal power station

Abstract

The invention discloses a spray evaporation treatment method of the wet method flue gas desulfurization wastewater in a thermal power station. In the method, an atomizing nozzle is arranged in the region with the temperature at 413-470 K and the flue gas speed of 5-11 m / s in a flue of the boiler tail part; desulfurization wastewater is pumped by utilizing a water pump, air is compressed by a compressor, and the pressure ratio of the compressed air to the desulfurization wastewater entering into the atomizing nozzle is 0.25-0.6; the speed of liquid droplets atomized by the atomizing nozzle is 50-80 m / s, and particle diameters of the liquid droplets are less than 50 mu m; and the liquid droplets are evaporated and then exhausted out of a chimney together with the flue gas. The invention can save chemical drugs utilized in the conventional wastewater treatment method; overcome the defects of many apparatuses, large investment, high running cost and heavy apparatus repair and maintenance load of a wastewater treatment system in the prior art, overcome the great corrosion influence of chlorine ions in water meta-acidity environment, reduce the specific resistance of ashes in a dust collector and improve the dust collector efficiency through increasing the flue gas humidity and properly lowering the flue gas temperature.

Description

technical field [0001] The invention relates to a treatment method for wet flue gas desulfurization wastewater in a thermal power plant, in particular to a spray evaporation treatment method for wet flue gas desulfurization wastewater in a thermal power plant. Background technique [0002] Generally, the treatment methods of wet flue gas desulfurization wastewater in thermal power plants are carried out by chemical methods such as neutralization, flocculation, and precipitation. However, due to the special properties of wet desulfurization wastewater from thermal power plants: it is weakly acidic, with a pH value lower than 5.7; the suspended matter is high, but the particles are fine, and the main components are dust and desulfurization products (CaSO4 and CaSO3); it contains soluble chloride and fluorine compounds, nitrates, etc.; and heavy metals such as mercury, lead, nickel, arsenic, and chromium. Wastewater treated with chemical methods such as neutralization, floccula...

AI Technical Summary

Problems solved by technology

The main problems faced by the spray evaporation treatment technology of wastewater droplets in low-temperature flue gas are: 1. How to realize the rapid evaporation of desulfurization wastewater after spraying has always been a difficult problem to be solved; 2. Wastewater droplets evaporate in low-temperature flue gas, which will Decreasing flue gas temperature and increasing flue gas humidity may cause corrosion of flue and dust collector

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