湿法烟气脱硫系统出口净烟气的温湿度变化特性

发布时间：2019-02-23 18:11

【摘要】：水汽相变技术与湿法烟气脱硫系统(wet flue gas desulfurization,WFGD)结合可有效控制细颗粒物排放,脱硫净烟气所能达到的过饱和度直接影响细颗粒物脱除效果,而烟气过饱和度取决于脱硫净烟气温湿度和水蒸气添加量。因而脱硫净烟气温湿度变化特性研究可为WFGD系统中应用水汽相变促进细颗粒物脱除提供依据,对于优化湿法脱硫操作条件、估算水蒸气添加量以及实现低能耗高效脱除细颗粒物具有重要意义。该文基于石灰石-石膏法脱硫工艺,试验考察了脱硫塔进口烟气温湿度、空塔气速、液气比、脱硫液温度等操作条件以及脱硫塔类型对脱硫净烟气温湿度的影响。结果表明,空塔气速由2.5 m/s提高至2.9 m/s可使脱硫净烟气相对湿度和绝对湿度分别由88%、82.2 g/kg先急剧降低至52%、57.3 g/kg,随后趋于相对平缓;液气比由5 L/m~3增至20 L/m~3有利于提高脱硫净烟气的相对湿度和绝对湿度,可分别由39%、46.4 g/kg提高至91%、84.3 g/kg,但相对湿度的增幅明显高于绝对湿度增幅;脱硫净烟气的相对湿度、绝对湿度及温度均随脱硫液温度升高而迅速提高,液气比为15 L/m3时,脱硫液温度由25℃升至60℃可使脱硫净烟气相对湿度、绝对湿度、温度分别由54%、25.9 g/kg、42℃提高至85%、98.5 g/kg、56℃,但脱硫液温度升至40℃后,脱硫净烟气的相对湿度趋于平缓;脱硫液温度保持不变时,提高塔进口烟气温度可使脱硫净烟气的绝对湿度和温度先明显增加,随后趋于平缓,而相对湿度随塔进口烟温提高稍有降低;并且不同的脱硫塔型对脱硫净烟气温湿度也有影响,液气比为5 L/m3时,经湍球塔、旋流板塔、喷淋塔脱硫后的净烟气相对湿度分别为90%、91%、44%。该研究结果为湿法烟气脱硫系统的应用提供参考。
[Abstract]:The combination of water vapor phase change technology and wet flue gas desulfurization system (wet flue gas desulfurization,WFGD) can effectively control the emission of fine particles, and the supersaturation of flue gas can directly affect the removal effect of fine particles. The supersaturation of flue gas depends on the temperature and humidity of desulfurized flue gas and the amount of water vapor added. Therefore, the study on the characteristics of temperature and humidity change of desulfurization net flue gas can provide a basis for the application of water vapor phase change in WFGD system to promote the removal of fine particles, and to optimize the operating conditions of wet desulfurization. It is of great significance to estimate the amount of water vapor and to realize the removal of fine particles with low energy consumption and high efficiency. Based on the limestone gypsum desulfurization process, the effects of operating conditions such as inlet flue gas temperature and humidity, gas velocity of empty tower, liquid gas ratio, desulfurization liquid temperature and type of desulfurization tower on flue gas temperature and humidity of desulfurized net flue gas were investigated experimentally in this paper. The results showed that the relative humidity and absolute humidity of desulfurized flue gas decreased sharply from 88 ~ 82.2 g/kg to 527.3 g / kg, respectively, when the empty tower gas velocity was increased from 2. 5 m / s to 2. 9 m / s. Then it tends to be relatively flat; Increasing the ratio of liquid to gas from 5 L/m~3 to 20 L/m~3 can increase the relative humidity and absolute humidity of the desulfurized net flue gas, which can be increased from 39 g/kg to 84.3 g / kg, respectively. But the increase of relative humidity is obviously higher than that of absolute humidity. The relative humidity, absolute humidity and temperature of the desulfurized net flue gas increase rapidly with the increase of the temperature of the desulfurized liquid. When the ratio of liquid to gas is 15 L/m3, the relative humidity and absolute humidity of the flue gas can be increased from 25 鈩，

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