A high-temperature flue gas mercury removal device and process

Abstract

The invention discloses a high temperature flue gas mercury removal device and technology. The device comprises a water-saving condenser, a triple water tank, an agent adding system and an ultrasonic atomization system, the water-saving condenser is inserted into a smoke discharge pipe, a water outlet of the water-saving condenser is connected to the triple water tank, the triple water tank is connected to the agent adding system, a water outlet of the triple water tank is connected to the ultrasonic atomization system, the ultrasonic atomization system is arranged in a boiler flue above an economizer, flue gas goes through the economizer and the ultrasonic atomization system and then orderly enters a denitration device, a dedusting device and a desulphurization device and a clean flue gas discharge outlet of the desulphurization device is connected to a flue gas discharge pipe. The water-saving condenser is an inserted water-saving condenser, is used for condensation and collection of saturated water vapor in desulfurated clean flue gas, reduces a flue gas water carrying amount, does not influence stable operation of later devices and realizes water saving and consumption reduction. Condensed water is added with an agent and is adjusted in the triple water tank, is used for changing a flue gas mercury form, is convenient for mercury removal and effectively improves mercury removal efficiency.

Description

technical field [0001] The invention relates to the technical field of industrial waste treatment equipment, in particular to a high-temperature flue gas mercury removal device and process. Background technique [0002] With the increasingly stringent national environmental protection policies, most of the thermal power units in service and new thermal power units are equipped with flue gas desulfurization devices, denitrification devices, and dust removal devices to ensure that the boiler flue gas SO 2 , NO X , dust and other pollutants discharge up to standard. At present, the limestone-gypsum wet desulfurization process is the most widely used flue gas desulfurization technology in coal-fired power plants, the SCR denitrification process is the most widely used denitrification technology, and the electrostatic precipitator process is the most widely used dust removal technology. [0003] Facing the increasingly severe environmental protection situation, China has issued...

AI Technical Summary

Problems solved by technology

In the prior art, the most effective and widely used technology for removing elemental mercury is activated carbon injection technology. Although this technology has a remarkable effect—it can remove 99% of elemental mercury, the operating cost of this technology is mainly due to the relatively high cost of activated carbon. High, so it cannot be widely used

However, calcium-based adsorbents have high adsorption efficiency for gaseous divalent mercury, but low removal efficiency for elemental mercury.

The results of the study showed that calcium-based substances such as Ca(OH) 2 , for HgCl 2 The adsorption efficiency can reach 85%; basic adsorbents such as CaO can also achieve good adsorption of HgCl 2 effect, but the adsorption efficiency of these calcium-based substances on elemental mercury is very low

[0008] Patent No. "201310328146.4" "A device and method for flue gas mercury removal using polyvinyl chloride and boiler fly ash", the invention patent of "201320050555.8" "A flue gas mercury removal device for coal-fired power stations" The new patents all propose the scheme of using chlorine salt and boiler to oxidize elemental mercury into gaseous divalent mercury, and then remove it in subsequent dust removal and desulfurization equipment, but the above schemes need to add a lot of new equipment, equipment investment is high, and chlorine The reaction efficiency between salt and elemental mercury is not high, which affects the conversion rate of elemental mercury, which is not conducive to industrial application

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