超重力法锅炉烟气同时除尘脱硫脱硝
Simultaneous removal of dust, SO2, and NOx from flue gas in a rotating packed bed
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摘要: 锅炉燃烧过程中产生的粉尘、SO2和NOx会对环境和人类造成严重的危害。随着人们环保意识的加强，锅炉烟气净化要求日趋严苛。进行了以O3为氧化剂，NaOH溶液为吸收剂，使用超重力反应器对锅炉尾气进行同时除尘脱硫脱硝的侧线实验研究，考察了不同操作条件对粉尘、SO2和NOx脱除率的影响规律，确定了适宜的操作条件：超重力反应器转速为1 000 r·min-1，气液比为125，pH值为11，O3/NOx物质的量之比为1.1。在该条件下，粉尘脱除率可达98.3%，SO2脱除率为98.4%，NOx脱除率为68.7%，处理后烟气能达标排放。超重力除尘脱硫脱硝一体化技术具有成本低、效率高、设备小和投资少等优点，在中小锅炉烟气净化过程具有广泛的应用前景。Abstract: Dust, SO2 and NOx generated in the process of boiler combustion has caused great harm to the environment and human body. With the enhancement of people's environmental awareness, the requirement of the flue gas purification become increasingly stringent. This article presents the side-stream test research on the simultaneous removal of dust, SO2 and NOx from flue gas by using O3 as oxidant and NaOH solution as absorbent in a rotating packed bed. The effects of different operation conditions on removal rate of dust, SO2 and NOx were investigated. The dust removal rate, desulfurization efficiency and denitration efficiency can reach 98.3%, 98.4% and 68.7% respectively under the optimum operation conditions of a rotation speed of 1000 r/min, a gas/liquid ratio of 125, a pH of 11 and a O3/NOx molar ratio of 1.1.The treated flue gas can achieve the environmental protection standard. This process with the advantages of low costs, high efficiency, small size and low investment cost exhibits widely application prospect in the purification of flue gas generated from middle or small boilers.
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