Flue Gas Desulfurization and Denitration Project of 2×360 m2 Sintering Machine of Hanbao Iron and Steel Co., Ltd. of Handan Iron and Steel Group in Hebei Province, China

1. Profile

(1) Project site:

No. 232 Fuxing Road, Fuxing District, Handan City, Hebei Province.

(2) Owner:

Hanbao Iron and Steel Co., Ltd. of Handan Iron and Steel Group.

(3) Capacity:

Flue gas desulfurization and denitration of 2×360m² sintering machine.

(4) Date of operation:

April 2018.

(5) Investment, construction and operation:

It was invested and operated by the Owner, designed by Handan Iron and Steel Group Design Institute Co., Ltd. and built by Handan Iron and Steel Group Engineering Co., Ltd.

2. Major environmental problems to be addressed

Emission control of SO₂ and NO_x in sintering flue gas.

3. Environmental standards and/or main index limits to be followed

According to the Ultra-low Emission Standard of Air Pollutants of Iron and Steel Industry (DB 13/2169-2018), the purified flue gas shall achieve ultra-low emission, with particulate matter emission concentration≤10 mg/m³, SO₂ emission concentration≤35mg/m³ and NO_x emission concentration≤50 mg/m³.

4. Technological process

The limestone-gypsum wet process was originally used for desulfurization, and then the reverse flow SCR active carbon desulfurization and denitration technology was adopted for renovation. The sintering flue gas was desulfurized through the desulfurization bed of the adsorption tower, then mixed with atomized ammonia water in the intermediate air chamber behind the desulfurization bed, and denitrated through the denitration bed.

5. Environmental pollution control effects

Before renovation, SO₂ concentration in flue gas was 130~140 mg/m³, NO_x concentration (taking NO₂ was 270~300 mg/m³ and particulate matter concentration was 30~40 mg/m³; after renovation, SO₂ emission concentration was≤10 mg/m³, NO_x concentration (taking NO₂, with 8% O₂ was ≤50 mg/m³ and particulate matter emission concentration was ≤10 mg/m³.

6. Investment and operation cost

The project investment was about RMB 300 million and the operation cost was RMB 20~23/t·sinter.

Highlights: The project is a model for using activated carbon for desulfurization and denitration, with high desulfurization and denitration efficiency, low system resistance and small floor space.