Purification technique for HCI gas in high temperature flue gas

Abstract

The present invention discloses a method, pertaining to the technical field of high-temperature flue-gas purification. The technical proposal includes: (1) alumina, silicon and lime are taken as the raw materials to obtain CaxALySizOwHv powder through chemical reaction by controlling the reaction conditions (wherein, x is equal to 1 to 3, y is equal to 1 to 4, z is equal to 3 to 6, w is equal to 6 to 14 and v is equal to 8 to 12); or (2) industrial mineral with abundant CaxAlySizOwHv is selected from the market as reactant (shortened as Ca-Al-Si reactant). The reactant can remove HCL gas from the high temperature (400 to 950 DEG C) flue gas and the efficiency is up to 90 to 99 percent. According to velocity and flux of the high-temperature flue-gas, the Ca-Al-Si reactant can be blown into the flue gas in the form of powder so as to ensure a certain reaction contact time; or the Ca-Al-Si reactant is processed into particles, blocks, etc. so as to be prepared into a form of a filler fixing bed reactor; when the high-temperature flue gas passes through the filler bed, HCL gas therein can be chemically purified, thus achieving the aim of flue-gas purification.

Description

technical field [0001] The invention relates to a technology for purifying gaseous hydrogen chloride in high-temperature flue gas, in particular to a purification agent capable of efficiently removing hydrogen chloride at high temperature. Background technique [0002] At present, the well-known HCl gasification technology in flue gas at home and abroad mainly adopts wet washing, dry or semi-dry alkaline chemical removal and other methods. Wet scrubbing produces a large amount of acidic wastewater, serious secondary pollution, and will greatly reduce the temperature of the flue gas, while greatly increasing the humidity of the flue gas, corroding downstream equipment; dry or semi-dry alkaline chemicals (such as lime, limestone, hydroxide Sodium, etc.) injection is only suitable for the removal of acid gases in medium and low temperature (≤400°C) environments, and is not suitable for the removal of HCl in high temperature environments. [0003] In coal combustion, solid wast...

AI Technical Summary

Problems solved by technology

Wet scrubbing produces a large amount of acidic wastewater, serious secondary pollution, and will greatly reduce the temperature of the flue gas, while greatly increasing the humidity of the flue gas, corroding downstream equipment; dry or semi-dry alkaline chemicals (such as lime, limestone, hydroxide Sodium, etc.) injection is only suitable for the removal of acid gases in medium and low temperature (≤400°C) environments, and is not suitable for the removal of HCl in high temperature environments

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