Experimental study on SO2 recovery using a sodium-zinc sorbent based flue gas desulfurization technology

doi:10.1016/j.cjche.2014.10.007

Abstract

Abstract: A sodium-zinc sorbent based flue gas desulfurization technology (Na-Zn-FGD) was proposed based on the experiments and analyses of the thermal decomposition characteristics of CaSO₃ and ZnSO₃·2.5H₂O, the waste products of calcium-based semi-dry and zinc-based flue gas desulfurization (Ca-SD-FGD and Zn-SD-FGD) technologies, respectively. Itwas found that ZnSO₃·2.5H₂O first lost crystal H₂O at 100 ℃ and then decomposed into SO₂ and solid ZnO at 260 ℃ in the air, while CaSO₃ is oxidized at 450 ℃ before it decomposed in the air. The experimental results confirm that Zn-SD-FGD technology is good for SO₂ removal and recycling, but with problem in clogging and high operational cost. The proposed Na-Zn-FGD is clogging proof, and more cost-effective. In the newprocess, Na₂CO₃ is used to generate Na₂CO₃ for SO₂ absorption, and the intermediate product NaHSO₃ reacts with ZnO powders, producing ZnSO₃·2.5H₂O precipitate and Na₂CO₃ solution. The Na₂CO₃ solution is clogging proof, which is re-used for SO₂ absorption. By thermal decomposition of ZnSO₃·2.5H₂O, ZnO is re-generated and SO₂ with high purity is co-produced as well. The cycle consumes some amount of raw material Na₂CO₃ and a small amount of ZnO only. The newly proposed FGD technology could be a substitute of the traditional semi-dry FGD technologies.

Key words: Flue gas desulfurization, Waste treatment, ZnSO₃·, 2.5H₂O pyrolysis, Sodium-zinc sorbent based, SO₂ co-production

摘要： A sodium-zinc sorbent based flue gas desulfurization technology (Na-Zn-FGD) was proposed based on the experiments and analyses of the thermal decomposition characteristics of CaSO₃ and ZnSO₃·2.5H₂O, the waste products of calcium-based semi-dry and zinc-based flue gas desulfurization (Ca-SD-FGD and Zn-SD-FGD) technologies, respectively. Itwas found that ZnSO₃·2.5H₂O first lost crystal H₂O at 100 ℃ and then decomposed into SO₂ and solid ZnO at 260 ℃ in the air, while CaSO₃ is oxidized at 450 ℃ before it decomposed in the air. The experimental results confirm that Zn-SD-FGD technology is good for SO₂ removal and recycling, but with problem in clogging and high operational cost. The proposed Na-Zn-FGD is clogging proof, and more cost-effective. In the newprocess, Na₂CO₃ is used to generate Na₂CO₃ for SO₂ absorption, and the intermediate product NaHSO₃ reacts with ZnO powders, producing ZnSO₃·2.5H₂O precipitate and Na₂CO₃ solution. The Na₂CO₃ solution is clogging proof, which is re-used for SO₂ absorption. By thermal decomposition of ZnSO₃·2.5H₂O, ZnO is re-generated and SO₂ with high purity is co-produced as well. The cycle consumes some amount of raw material Na₂CO₃ and a small amount of ZnO only. The newly proposed FGD technology could be a substitute of the traditional semi-dry FGD technologies.

关键词: Flue gas desulfurization, Waste treatment, ZnSO₃·, 2.5H₂O pyrolysis, Sodium-zinc sorbent based, SO₂ co-production

Yang Zhang, Tao Wang, Hairui Yang, Hai Zhang, Xuyi Zhang . Experimental study on SO₂ recovery using a sodium-zinc sorbent based flue gas desulfurization technology[J]. Chin.J.Chem.Eng., 2015, 23(1): 241-246.

Yang Zhang, Tao Wang, Hairui Yang, Hai Zhang, Xuyi Zhang . Experimental study on SO₂ recovery using a sodium-zinc sorbent based flue gas desulfurization technology[J]. Chinese Journal of Chemical Engineering, 2015, 23(1): 241-246.

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Experimental study on SO₂ recovery using a sodium-zinc sorbent based flue gas desulfurization technology

Experimental study on SO₂ recovery using a sodium-zinc sorbent based flue gas desulfurization technology

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