發(fā)布時間：2019-02-23 18:11

【摘要】：水汽相變技術(shù)與濕法煙氣脫硫系統(tǒng)(wet flue gas desulfurization,WFGD)結(jié)合可有效控制細顆粒物排放,脫硫凈煙氣所能達到的過飽和度直接影響細顆粒物脫除效果,而煙氣過飽和度取決于脫硫凈煙氣溫濕度和水蒸氣添加量。因而脫硫凈煙氣溫濕度變化特性研究可為WFGD系統(tǒng)中應用水汽相變促進細顆粒物脫除提供依據(jù),對于優(yōu)化濕法脫硫操作條件、估算水蒸氣添加量以及實現(xiàn)低能耗高效脫除細顆粒物具有重要意義。該文基于石灰石-石膏法脫硫工藝,試驗考察了脫硫塔進口煙氣溫濕度、空塔氣速、液氣比、脫硫液溫度等操作條件以及脫硫塔類型對脫硫凈煙氣溫濕度的影響。結(jié)果表明,空塔氣速由2.5 m/s提高至2.9 m/s可使脫硫凈煙氣相對濕度和絕對濕度分別由88%、82.2 g/kg先急劇降低至52%、57.3 g/kg,隨后趨于相對平緩;液氣比由5 L/m~3增至20 L/m~3有利于提高脫硫凈煙氣的相對濕度和絕對濕度,可分別由39%、46.4 g/kg提高至91%、84.3 g/kg,但相對濕度的增幅明顯高于絕對濕度增幅;脫硫凈煙氣的相對濕度、絕對濕度及溫度均隨脫硫液溫度升高而迅速提高,液氣比為15 L/m3時,脫硫液溫度由25℃升至60℃可使脫硫凈煙氣相對濕度、絕對濕度、溫度分別由54%、25.9 g/kg、42℃提高至85%、98.5 g/kg、56℃,但脫硫液溫度升至40℃后,脫硫凈煙氣的相對濕度趨于平緩;脫硫液溫度保持不變時,提高塔進口煙氣溫度可使脫硫凈煙氣的絕對濕度和溫度先明顯增加,隨后趨于平緩,而相對濕度隨塔進口煙溫提高稍有降低;并且不同的脫硫塔型對脫硫凈煙氣溫濕度也有影響,液氣比為5 L/m3時,經(jīng)湍球塔、旋流板塔、噴淋塔脫硫后的凈煙氣相對濕度分別為90%、91%、44%。該研究結(jié)果為濕法煙氣脫硫系統(tǒng)的應用提供參考。
[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，

本文編號：2429076