Sintering flue gas desulfurization and denitrification system and implementation method thereof

Abstract

The invention relates to a sintering flue gas desulfurization and denitrification system and an implementation method thereof. According to the method, after two paths of sintering flue gas coming out of a sintering machine pass a dust collector, one path of sintering flue gas and high-temperature sintering ore coming out of the sintering machine are subjected to heat exchange and temperature rise, the sintering flue gas is mixed with the other path of sintering flue gas and enters an SCR (selective catalytic reduction) reactor after temperature rise, catalytic reduction reaction is performed in the SCR reactor, nitrogen oxide in the sintering flue gas is removed, the sintering flue gas without the nitrogen oxide enters a waste heat boiler, waste heat of the flue gas is recycled, the sintering flue gas subjected to heat exchange and cooling by the waste heat boiler enters a desulfurization device, sulfur dioxide is removed, and purified flue gas subjected to desulfurization and denitrification is discharged with standard level. The sintering flue gas is simultaneously subjected to desulfurization and denitrification, sensible heat of the sintering ore and the sintering flue gas is sufficiently recycled, and sintering energy conservation and emission reduction are realized in a real sense.

Description

technical field [0001] The invention belongs to the field of comprehensive utilization of sintering flue gas denitrification and energy recovery, in particular to a system for simultaneous desulfurization and denitrification of sintering flue gas and its implementation method, that is, to realize the discharge of nitrogen oxides and sulfur dioxide in sintering flue gas up to the standard, and at the same time, greatly increase the Improve the recycling rate of sinter waste heat. Background technique [0002] my country is a big steel producing country with the highest total steel output in the world. It is also a key monitoring object for national pollutant discharge. In 2011, the energy consumption of the national iron and steel industry exceeded 400 million tons of standard coal, accounting for more than 15% of the country's total energy consumption. Therefore, iron and steel Industrial energy conservation and emission reduction is an important aspect of my country's energy...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a system for simultaneous desulfurization and denitrification of sintering flue gas and its implementation method for the above-mentioned prior art, which not only solves the problem that NOx is difficult to remove from sintering flue gas at present, but also realizes simultaneous desulfurization and denitrification of sintering flue gas, It also fully recovers the sensible heat of sintering ore and sintering flue gas, realizing energy saving and emission reduction in sintering in a true sense

Images