Atomizer used in flue gas desulphurization wastewater evaporator

Abstract

The invention discloses an atomizer used in a flue gas desulphurization (FGD) wastewater evaporator. The atomizer is characterized in orderly arranged communicable components of: an inlet straight section, an evaporation section with a gradually decreasing cross section size, and a mixing section. The mixing section communicates with a wastewater outlet port. The inlet straight section is provided with a Laval nozzle. A wastewater inlet and a superheated vapor inlet are arranged on an end of the inlet straight section. An inlet of the nozzle communicates with the superheated vapor inlet. An annular cavity is provided around the mixing section. The annular cavity is provided with a compressed air inlet and a compressed air outlet. With the atomizer provided by the present invention, wastewater can be effectively atomized and vaporized without an increase in energy consumption.

Description

technical field [0001] The invention relates to an atomizer used for a desulfurization waste water flue gas evaporation device, in particular to an airflow atomization spray gun. Background technique [0002] As my country's environmental protection continues to increase, most coal-fired power plant boilers are equipped with flue gas desulfurization devices. Among them, the limestone-gypsum wet flue gas desulfurization process has been widely used at home and abroad due to its mature and reliable technology, wide sources of limestone and easy availability, accounting for about 90% of the installed desulfurization capacity. Since the fuel used in power plant boilers is mainly coal, during the process of washing the flue gas with limestone gypsum slurry, the gaseous pollutants and fly ash in the flue gas are washed into the gypsum slurry, and the harmful substances such as chloride ions and heavy metal ions contained in it It also enters the flue gas desulfurization system, a...

AI Technical Summary

Problems solved by technology

However, the temperature at the outlet of the air preheater in the power station is generally not high (usually about 130°C), and the water content of the wastewater is relatively high (usually about 95%). To achieve effective evaporation treatment of wastewater, a larger gas-liquid Contact area and residence time; at present, a two-fluid spray gun is usually used, that is, compressed air is used as the atomizing medium, and the wastewater is atomized into fine particles under the action of high-pressure air. The diameter is reduced, requiring more compressed air; even then, at low loads, there is still some wastewater that cannot be treated due to the lack of available heat

[0005] Some scholars also proposed to use thin-film evaporator to directly evaporate and crystallize to remove excess water in wastewater. However, since most of the solid content in wastewater is limestone and gypsum, the scaling phenomenon is very serious, and the actual operation effect is not good.

Images