Method of desulfurizing and denitrate simultaneously of exhaust gas by micro wave catalysis

Abstract

The present invention discloses a flue gas purifying method capable of catalyzing flue gas by using microwave and simultaneously making desulfurization and denitration. Said method is characterized by that firstly, the catalyst is placed in a special-designed fixed bed reactor, then the normal-pressure simulated flue gas is introduced to make microwave catalytic desulfurization and denitration reaction. Its desulfurization and denitration efficiency is high, when the space velocity is 8000h-1 and the temperature is 150deg.C, its desulfurization rate can be up to 95% and its denitration rate can be up to 87%, and its catalyst can be regenerated and reused.

Description

technical field [0001] The invention belongs to the field of industrial waste gas treatment, and in particular relates to a simultaneous desulfurization and denitrification purification method for microwave catalytic flue gas. Background technique [0002] Coal is the main energy source in our country. For quite a long time in the future, the utilization of coal in my country will still be dominated by combustion. A large amount of SO emitted during coal combustion 2 and NOx, seriously polluting the ecological environment such as the atmosphere. Therefore, how to economically and effectively control SO in coal-fired flue gas 2 and NO x The discharge of coal has become a major problem that needs to be solved urgently in my country's sustainable development strategy, and it is also the development direction of the world's coal-burning pollution control technology. At home and abroad, in the analysis of SO in coal-fired flue gas 2 and NO x Many technologies have been dev...

AI Technical Summary

Problems solved by technology

The main problem of this method is: need to inject NH 3 , easy to leak during transportation and storage; the denitrification rate is low and only suitable for use in high-sulfur coal areas; the electron accelerator and vacuum system equipment is huge, and the primary cost is high; X-ray radiation is harmful, so it is necessary to install 1-2m thick radiation-proof cement layer; titanium target window is easily damaged, etc.

However, the electron gun in this method is expensive; the reaction temperature is 70°C, the flue gas needs to be cooled first, and then heated up when it is discharged; use NH 3 Recovery of SO 2 and NO, NH 3 Leakage may occur during transportation and storage, resulting in secondary pollution

[0008] The use of microwave heating for flue gas catalytic denitrification has been reported in Chinese patent (application number 200510027964.6). Microwave heating not only has a denitrification rate of over 90%, but also can reduce the reaction temperature and increase the reaction speed; but the patent does not involve catalyst deactivation After how to regenerate and SO 3 , NO 2 Recycling and other issues