System and method capable of carrying out flue gas denitration and efficiency increasing through ozone

Abstract

The invention relates to the field of industrial waste gas purifying environment friendliness and energy, in particular to a system and method capable of carrying out flue gas denitration and efficiency increasing through ozone. The system capable of carrying out flue gas denitration and efficiency increasing through the ozone comprises a circulating fluidized bed boiler and an online monitoring system, a gas outlet pipe of the circulating fluidized bed boiler is connected with a cyclone separator, a gas outlet pipe of the cyclone separator is connected with a flue, the flue is internally andsequentially provided with a high-temperature economizer, a denitration catalyst, and a medium / low temperature economizer, an ozone generation system is connected to the gas outlet pipe of the circulating fluidized bed boiler, a gas inlet pipe and the gas outlet pipe of the cyclone separator are connected with ammonium hydroxide supply systems, the flue is provided with an ash blowing system usedfor removing accumulated ash on the surface of the denitration catalyst, SNCR and SCR methods can be coupled, the denitration efficiency can be improved, the NOx ultra-emission needs can be met, the site can be saved, and the investment can be saved.

Description

technical field [0001] The invention relates to the fields of industrial waste gas purification, environmental protection and energy, in particular to a system and method for utilizing ozone to denitrify flue gas and increase efficiency. Background technique [0002] my country's coal-based energy structure will not change for a long time, therefore, the control of coal-fired flue gas NO x Emission is an important task in my country's air pollution control. Selective non-catalytic reduction (SNCR) technology and NH 3 NO as reducing agent x Selective catalytic reduction (SCR) technology is the most widely used and most effective coal-fired flue gas denitrification technology in recent years. However, circulating fluidized bed boilers have the characteristics of rapid load changes and complex fuels, so the NO in flue gas x The concentration varies greatly, and the existing SNCR method has low efficiency and cannot cope with NO x In the case of high content, rapid change a...

AI Technical Summary

Problems solved by technology

[0004] The present invention is mainly aimed at rapid load changes of circulating fluidized bed boilers, complex fuels, and NO in flue gas x Due to the characteristics of large concentration changes, the existing SNCR method has low efficiency and cannot deal with NO x In the case of high content, rapid change, and large ammonia escape, the SCR method has high requirements for the site and high investment. A system and method for using ozone to increase the efficiency of flue gas denitrification is provided, which can couple SNCR and SCR methods to improve denitrification. efficiency, meeting high NO x super discharge requirements, and can save space and save investment

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