Method and system for high-efficiency mercury removal by modification of dust collector fly ash

Abstract

The invention provides a fly ash modified high-efficient mercury removal method of a dust remover. The method includes steps of delivering fly ash collected by the dust remover to an ultrasound wave atomization plant held with modified reagent solution; after obtaining modified fly ash, spraying to an ash conveying pipeline and remove mercury in the smoke gas. Meanwhile, the invention also provides a fly ash modified high-efficient mercury removal system of the dust remover. The fly ash modified high-efficient mercury removal system comprises the dust collector, a cone funnel at the bottom part of the dust collector, the ultrasound wave atomization plant and a coal saver which are orderly interconnected with the funnel; the ultrasound wave atomization plant is orderly interconnected with a modifying tank and a waste water pond at the same time. The invention improves the situation of unclear mercury removal route, and provides the mercury removal method and system with high practice degree, low operation cost and saved running cost for mercury removal of waste gas, tail gas and smoke gas of a heat-engine plant, an industry kiln stove, a garbage incinerator and other fixed pollution sources; besides, the system can consume waste water in the plant area and cannot influence the quality of fly ash.

Description

technical field [0001] The invention relates to a modified high-efficiency mercury removal method and system for dust collector fly ash, and belongs to the technical field of flue gas mercury removal and purification. Background technique [0002] Mercury is a transition element in the periodic table of elements, and it is the only liquid metal in the standard state (0°C, 101.325KPa), commonly known as mercury. Metallic mercury evaporates at room temperature to form colorless, odorless mercury vapor, and the higher the temperature, the more liquid metal mercury releases more vapor. Due to its many valuable properties, mercury was widely used in commerce, industry, mining, metallurgy, manufacturing, medicine and dentistry during the Industrial Revolution. [0003] However, mercury is also the only heavy metal pollutant that mainly exists in the atmosphere in gaseous phase, and has the characteristics of persistence, easy migration, high bioaccumulation and biomagnification. ...

AI Technical Summary

Problems solved by technology

The adsorbent adsorption method is mainly a method of treating pollutants by using the adsorption of porous solid substances, including physical adsorption and chemical adsorption. and other factors, the adsorption effect is not the same, the effect is unstable, and the cost of the adsorbent with better effect is higher, which is not conducive to widespread use

The mercury removal method using existing waste treatment facilities mainly refers to the use of desulfurization facilities and denitrification facilities of dust removal facilities to adsorb mercury in the flue gas, remove part of the mercury, and reduce mercury emissions. The dust removal facilities mainly include bag filter and static electricity. Dust collector, the removal of mercury by the dust collector is mainly to capture most of the particulate mercury in the flue gas, and part of the gaseous elemental mercury is also captured because it is adsorbed on the surface of the particles, but the adsorption effect of the dust collector on the gaseous elemental mercury is small. The mercury removal efficiency of the bag filter is about 70%, and its removal efficiency is higher than that of the electrostatic precipitator, but because the bag filter is close to the rear of the furnace, the flue gas temperature is relatively high Factors such as cost limit its use

[0005] At present, there are also attempts to use modified fly ash to remove mercury. However, many modified reagents and equipment do not have strong operability, or the modified reagents are highly corrosive and unstable, or the equipment structure is complicated and expensive, and it is not easy to clean and maintain. Not suitable for industrial scale use

Images