Double alkali flue gas desulfurization process flow

脱硫工艺主要包括5个部分：吸收剂制备与补充；吸收剂浆液喷淋；塔内雾滴与烟气接触混合；再生池浆液还原钠基碱；石膏脱水处理。

The desulfurization process mainly includes five parts: preparation and supplement of absorbent; Absorbent slurry spray; The droplets in the tower contact and mix with the flue gas; The slurry of regeneration tank reduces sodium base alkali; Gypsum dehydration treatment.

采用锻钢炉的烟气经换热降温到≤200℃，经烟道从塔底进入脱硫塔。在脱硫塔内布置若干层数十支喷嘴，喷出细微液滴雾化均布于脱硫塔溶积内，烟气与喷淋脱硫液进行充分汽液混合接触，使烟气中SO2和灰尘被脱硫液充分吸收、反应，达到脱尘除SO2的目的。经脱硫洗涤后的净烟气经塔顶除雾器脱水，经脱硫塔上部进入烟囱排入大气。

The flue gas from the forged steel furnace is cooled to ≤ 200 ℃ by heat exchange and enters the desulfurization tower from the bottom of the tower through the flue. Several layers of ten nozzles are arranged in the desulfurization tower, and the atomization of fine droplets is uniformly distributed in the dissolution of the desulfurization tower. The flue gas is fully mixed with the spray desulfurization liquid, so that SO2 and dust in the flue gas are fully absorbed and reacted by the desulfurization liquid, so as to achieve the purpose of dust removal and SO2 removal. The net flue gas after desulfurization and washing is dehydrated by the tower top demister, and then enters the chimney through the upper part of the desulfurization tower and is discharged into the atmosphere.

脱硫循环液经塔内气液接触除SO2后，经塔底管道流入沉淀池在此将灰尘沉淀下来，清液经上部溢进入反应再生池，在池内与石灰乳液制备槽引来的石灰乳进行再生反应，再生液流入泵前循环槽补入Na2CO3，由泵打入脱硫塔顶脱除SO2循环使用。其中再生产出的CaSO3及烟气中过剩氧生成的CaSO4于沉淀池中沉淀分离。

After SO2 is removed by gas-liquid contact in the tower, the desulfurization circulating liquid flows into the sedimentation tank through the pipeline at the bottom of the tower to precipitate the dust here. The clear liquid overflows into the reaction regeneration tank through the upper part, and regenerates with the lime milk introduced from the lime lotion preparation tank in the tank. The regenerated liquid flows into the circulating tank in front of the pump to supplement Na2CO3, and is pumped into the desulfurization tower top to remove SO2 for recycling. CaSO3 produced by regeneration and CaSO4 produced by excess oxygen in flue gas are precipitated and separated in the sedimentation tank.

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