Electric-furnace flue gas emission treatment device and method

Abstract

The invention provides an electric-furnace flue gas emission treatment device and method. The electric-furnace flue gas emission treatment device comprises a settling cooling assembly, a roof hood, aflow confluence pipeline, an electric-bag composite dust removing assembly and an activated carbon jetting device, wherein an inlet of the settling cooling assembly is connected with a flue gas outletof an electric furnace, the roof hood is arranged above the electric furnace, and an inlet of the flow confluence pipeline communicates with an outlet of the settling cooling assembly and an outlet of the roof hood; an inlet of the electric-bag composite dust removing assembly is connected with an outlet of the flow confluence pipeline, and a flue gas outlet of the electric-bag composite dust removing assembly communicates with a chimney; and an outlet of the activated carbon jetting device is connected to the flow confluence pipeline and can jet activated carbon to the flow confluence pipeline. The activated carbon jetting device is arranged so that an appropriate amount of activated carbon can be jet into the flow confluence pipeline before the electric-bag composite dust removing assembly, and it is guaranteed that flue gas is fully and uniformly mixed with the activated carbon; and meanwhile, gas-phase and solid-phase dioxins in electric-furnace flue gas can be adsorbed, emissionof particulate matters in the electric-furnace flue gas is superior to the ultra-low emission standard, and flue gas heat can be effectively recycled.

Description

technical field [0001] The invention relates to the field of electric furnace flue gas emission, in particular to an electric furnace flue gas emission treatment device and method. Background technique [0002] The electric furnace is mainly smelted by using scrap steel, ferroalloy and some slag materials, and at the same time, according to the requirements of different steel types, a certain proportion of molten iron is mixed. The flue gas produced by the electric furnace during the smelting process contains dust particles and dioxins, and the dust concentration of the primary flue gas particles can reach 30g / Nm 3 , the content of dioxin is 5-12ngTEQ / Nm 3 , although it belongs to trace amounts, it has been valued by more and more countries due to its highly toxic properties. [0003] For the treatment of dioxins in electric furnace flue gas, iron and steel enterprises currently use scrap steel pretreatment to reduce the amount of scrap steel containing organic matter such...

AI Technical Summary

Problems solved by technology

[0007] Disadvantages of prior art 1: Dust and dioxins are filtered and catalyzed by only two layers of packing, fine dust and gaseous dioxins escape at the outlet of the packing device, and it is impossible to ensure that the flue gas meets the ultra-clean emission standard, that is, the particle content is ≤ 5mg / Nm 3 , dioxin content ≤ 0.1ngTEQ / Nm 3

[0009] Disadvantages of existing technology 2: In order to suppress the resynthesis of dioxin to the greatest extent, this technology adopts water spray evaporative cooling for rapid cooling, which wastes a lot of high-temperature heat. At the same time, in order to avoid condensed water affecting the bag, a high-temperature filter material at 200 ° C must be selected , expensive

Moreover, this technology cannot ensure that the flue gas reaches the ultra-clean emission standard

Images