Method for determining sulfur dioxide oxidation rate of selective catalytic reduction denitration catalyst

测定选择性催化还原脱硝催化剂二氧化硫氧化率的方法

Abstract

The invention relates to a method for determining a sulfur dioxide oxidation rate of a selective catalytic reduction denitration catalyst. The method is characterized by comprising the following steps of 1, controlling a temperature of a gas trap in a range of 85 to 95 DEG C, and connecting the gas trap to a boiler for flue gas trapping, wherein a gas absorption bottle is connected to the gas trap and a H2O2 solution for absorption of SO2 gas is placed in the gas absorption bottle, 2, starting a suction pump and sucking out flue gas in the boiler, 3, after sampling, flushing the flue gas trapped by the gas trap by a sulfuric acid solution having a pH value of 5 to 6, and collecting the solution obtained by flushing, wherein the H2O2 solution absorbs SO2 gas to form absorption liquid, 4, through a sodium borate solution, titrating the solution obtained by flushing until a pH value of the solution obtained by flushing reaches 5.5, and calculating the concentration SO3(ppm) of SO3, 5, analyzing the concentration of SO2 in the absorption liquid by a precipitation titration method, and 6, calculating an oxidation rate of SO2. The method can guarantee that water vapor in flue gas does not condense; SO2 does not react with oxygen and water vapor; and a measuring result is accurate.
本发明涉及一种测定选择性催化还原脱硝催化剂二氧化硫氧化率的方法,特征是,包括以下工艺步骤:(1)控制气体捕集器的温度恒定在85~95℃,并将气体捕集器连接到锅炉上以捕集烟气,在气体捕集器上连接有气体吸收瓶,气体吸收瓶里盛放有用于吸收SO2气体的H2O2溶液;(2)打开抽气泵,抽取锅炉内的烟气;(3)取样结束后,用pH值为5~6的硫酸溶液冲洗气体捕集器上的烟气,收集冲洗液,SO2气体被H2O2溶液吸收得到吸收液;(4)用硼酸钠溶液滴定冲洗液直到pH为5.5,计算得到SO3的浓度SO3(ppm);(5)采用沉淀滴定法分析吸收液中的SO2的浓度;(6)计算SO2的氧化率。本发明具可以保证烟气中的水蒸汽不会冷凝,SO2不会和氧气、水汽发生反应,测量准确。

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Cited By (1)

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    CN-102778518-ANovember 14, 2012东南大学Method and device for measuring SOx in fire coal fume