【作者】 陈国庆； 高继慧； 赵海谦； 吴少华； 秦裕琨；

【Author】 CHEN Guo-qing;GAO Ji-hui;ZHAO Hai-qian;WU Shao-hua;QIN Yu-kun;School of Energy Science and Engineering,Harbin Institute of Technology;

【机构】 哈尔滨工业大学能源科学与工程学院；

【摘要】 为了分析钙基吸收剂硫氮协同脱除过程中产物层的生长机制,采用氢氧化钙单晶体表面(0001)模拟吸收剂孔隙的孔壁及外表面,针对脱硫、脱硝及硫氮协同脱除过程中产物层的生长规律进行了分析,结合晶体生长理论及脱硫和脱硝过程中产物层生长的差异,提出了硫氮协同脱除过程中产物层生长的机制。研究结果表明,脱硫反应首先发生在单晶表面局部区域,并使该区域膨胀形成颗粒状凸起结构;之后,随着反应区域不断扩大,表面膨胀趋于一致,从而形成连续致密产物层。由于脱硝产物易溶于水,且在液膜中扩散,因此脱硝反应对单晶表面表现出刻蚀作用。硫氮协同脱除过程中,脱硝反应的刻蚀作用抑制了脱硫连续致密产物层的形成,同时,液膜中脱硝产物的出现也改变了脱硫产物的生长习性,因此反应后产物层为疏松结构。更多还原

【Abstract】 In order to analyze the growth mechanism of product layer in SO₂ and NO_x removal by calcium based sorbent,the single-crystal Ca（OH）₂（0001） surfaces were employed to simulate the pore wall and the external surface of the sorbent.The growth law of product layer was analyzed under different reaction environment.The growth mechanism of procudt layer in SO₂ and NO_x simultaneous removal by calcium sorbent was proposed,combining the crystal growth theories and the discrepancy between SO₂ and NO_x single removal.The results show that SO₂ removal reaction firstly occurs in the partial area of the single-crystal surface,and result in the expansion of the surface and the formation of the convex structure.Subsequently,the reaction and expansion area gradually extend,which leads to the formation of the continuous dense product layer.Due to the solubility and diffusion of NO₂ removal product in the water film,NO₂ reaction has obvious etching effct on the sorbent surface.When SO₂ removal reaction coexists with NO₂ removal reaction,the etching action of NO₂ removal reaction can inhibit the formation of the continuous dense SO₂ removal product layer.Meanwhile,the presence of NO₂ removal product can change the grow habit of SO₂ removal product.Therefore,the sorbent surface structure after simultaneously reacting with SO₂ and NO_x are loose.更多还原