Method for removing SO2 in gas

Abstract

A method for removing SO2 in gas is characterized in that tetrahydroxyethyl-ethylene diamine or tetrahydroxypropyl-ethylene diamine, H3PO4 and the like are subjected to molar reaction to generate ammonium salt water solution serving as an absorbent, the absorbent contacts with the gas containing the SO2 to remove the SO2 by absorption, the molar concentration of the ammonium salt water solution serving as the absorbent is 0.2-0.5mol/L, the volume concentration of the SO2 in the absorbed gas is 0.5-99%, absorption temperature is 0-70 DEG C, the saturated ammonium salt water solution desorbs the SO2 by heating under normal pressure after absorbing the SO2, so that the saturated ammonium salt water solution can be reused, SO2 desorption temperature is 70-102 DEG C, and SO2 desorption time is 20-120 minutes. Compared with the prior art, the method has the advantages that the absorbent is good in desulfurization performance and recycling performance, the saturated absorbent easily desorbs the SO2 after absorbing the SO2, and the absorbent is easily dissolved in water and free from saturated vapor pressure and avoids the problems of equipment blockage due to scaling and the like.

Description

technical field [0001] The invention relates to a method for removing SO in gas 2 method, specifically related to the removal of flue gas, containing SO 2 SO in waste gas and / or industrial feed gas 2 . Background technique [0002] With the rapid development of industry, flue gas, containing SO 2 exhaust emissions are increasing day by day. Contains SO 2 The discharge of waste gas has brought serious harm to the ecological environment, such as the formation of acid rain, acidification of water quality, respiratory diseases, etc. Countries around the world are concerned about flue gas, containing SO 2 More and more attention has been paid to the emission of exhaust gas, and researchers are also trying to control flue gas, containing SO 2 Great efforts have been made in the emission of exhaust gases. However, so far flue gas, containing SO 2 Exhaust gas desulfurization technology is still an important problem to be solved urgently. [0003] Existing flue gas, contain...

AI Technical Summary

Problems solved by technology

Dry desulfurization and desulfurization agents mainly include activated carbon, iron oxide, zinc oxide, manganese oxide, etc., which have problems such as low removal efficiency and non-renewable absorbents.

Wet desulfurization includes water washing method, limestone / gypsum method, sodium alkali method, double alkali method and ammonia method, etc. Among them, water washing method has large water consumption, water resources cannot be recycled, secondary pollution caused by sulfur-containing sewage and poor desulfurization effect and other problems; limestone / gypsum method has problems such as large equipment investment, solid deposits that cause easy scaling and blockage of equipment, and serious wear and tear of equipment parts; sodium-alkali method and double-alkali method have high alkali consumption and difficult repetition of absorbents Use and other problems; while the ammonia method has problems such as absorbent ammonia escape and aerosols