焦?fàn)t煙氣高效氧化吸收脫硫脫硝一體化中試實(shí)驗(yàn)及模擬優(yōu)化
發(fā)布時(shí)間：2019-07-10 11:15
【摘要】：焦?fàn)t煙道氣中含有大量SO_2和NO_x,排放濃度呈周期性變化。本論文采用氧化吸收法對焦?fàn)t煙氣中SO_2和NO_x同時(shí)脫除進(jìn)行研究,發(fā)現(xiàn)氧化劑、工藝條件和催化劑是高效脫硫脫硝一體化的重要影響因素。選擇流量為2000 m~3/h(180 oC)的焦?fàn)t煙氣作為中試試驗(yàn)對象,根據(jù)焦?fàn)t煙氣的特點(diǎn),設(shè)計(jì)氧化吸收脫硫脫硝一體化工藝。選擇O3和H2O2作為煙氣脫硝的氧化劑,氨水為吸收劑,利用實(shí)驗(yàn)室自制催化劑提高氧化劑的氧化效率。NO分兩階段被氧化,第一階段大部分NO被臭氧氧化,剩余的NO被H2O2在第二階段氧化,氧化產(chǎn)物隨煙氣進(jìn)入吸收塔。在吸收塔中,高價(jià)態(tài)的NO_x和SO_2一起被吸收液吸收,生成硝酸銨和硫酸銨,可作為化肥原料。中試試驗(yàn)發(fā)現(xiàn),當(dāng)氨水濃度為1 wt.%,液氣比為5 L/m~3時(shí)SO_2的脫除率達(dá)到98%,而NO基本未脫除。采用臭氧氧化脫硝中試過程中發(fā)現(xiàn),臭氧注入量與煙氣中NO摩爾比為0.8時(shí),NO的脫除率達(dá)到94%;增加臭氧用量,NO脫除率無明顯變化;使用自制臭氧增強(qiáng)催化劑后,臭氧和氣態(tài)水在催化劑表面反應(yīng)產(chǎn)生羥基自由基,以提高臭氧的氧化效率,當(dāng)O3:NO(mol:mol)=0.7時(shí),脫硝效率達(dá)到85%以上。雙氧水氧化脫硝實(shí)驗(yàn)中發(fā)現(xiàn),溫度是影響雙氧水氧化脫硝的重要因素,氣態(tài)雙氧水與液態(tài)雙氧水相比脫硝效率更高。在煙氣溫度120 oC,雙氧水氣態(tài)進(jìn)料同時(shí)使用催化劑的條件下,當(dāng)H2O2與NO的摩爾比為1.5時(shí),氮氧化物脫除率達(dá)到31.4%。利用Aspen Plus大型模擬軟件對100000 Nm~3/h的煙氣進(jìn)行工藝流程模擬優(yōu)化,分別考察了煙氣溫度、氧化劑用量等對SO_2和NO脫除率的影響,為工程應(yīng)用提供了有力的數(shù)據(jù)支持。
文內(nèi)圖片：
圖片說明：煙氣脫硫脫硝一體化工藝流程圖
[Abstract]:The flue gas of the coke oven contains a large amount of SO _ 2 and NO _ x, and the emission concentration is periodically changed. In this paper, the simultaneous removal of SO _ 2 and NO _ x in the flue gas of the coke oven was studied by the oxidation-absorption method, and it was found that the oxidizing agent, the process condition and the catalyst were the important factors of the integration of high-efficiency desulfurization and denitrification. The coke oven flue gas with the flow rate of 2000m ~ 3/ h (180oC) is selected as a pilot test object, and the integrated process of oxidation absorption and desulfurization and denitrification is designed according to the characteristics of the coke oven flue gas. And the oxidation efficiency of the oxidizing agent is improved by using the laboratory self-made catalyst as the oxidizing agent and the ammonia water of the flue gas denitration by using the O3 and the H2O2 as the absorbent. The NO is oxidized in two stages, most of the NO in the first stage is oxidized by ozone, the remaining NO is oxidized by H2O2 in the second stage, and the oxidation product enters the absorption tower with the flue gas. In the absorption tower, the high-valence NO _ x and SO _ 2 are absorbed by the absorption liquid to form the ferric nitrate and the sulfur sulfate, and can be used as a chemical fertilizer raw material. The pilot test found that when the ammonia concentration was 1 wt. The removal rate of SO _ 2 is 98% when the gas-to-gas ratio is 5 L/ m ~ 3, and NO is basically not removed. in that experiment of ozone oxidation and denitration, the removal rate of NO is reach 94 percent when the molar ratio of the ozone injection to the NO in the flue gas is 0.8, the amount of the ozone is increased, the NO removal rate is not obviously change, and after the self-made ozone-enhanced catalyst is used, And the ozone and the gaseous water react on the surface of the catalyst to generate hydroxyl radicals so as to improve the oxidation efficiency of the ozone, and when the O3: NO (mol: mol) is 0.7, the denitration efficiency can reach more than 85 percent. In the experiment of hydrogen peroxide oxidation and denitration, the temperature is an important factor which influences the oxidation and denitration of hydrogen peroxide, and the denitration efficiency of the gaseous hydrogen peroxide is higher than that of the liquid hydrogen peroxide. The removal rate of nitrogen oxide is 31.4% when the molar ratio of H2O2 to NO is 1.5 when the temperature of the flue gas is 120oC and the gaseous feed of the hydrogen peroxide is used as the catalyst. The influence of the flue gas temperature and the dosage of the oxidant on the removal rate of SO _ 2 and NO was studied by using the Aspen Plus large-scale simulation software. The effect of the flue gas temperature and the dosage of the oxidizing agent on the removal rate of SO _ 2 and NO was investigated. The data support was provided for the engineering application.
【學(xué)位授予單位】：濟(jì)南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：X784
本文編號：2512566
文內(nèi)圖片：
圖片說明：煙氣脫硫脫硝一體化工藝流程圖
[Abstract]:The flue gas of the coke oven contains a large amount of SO _ 2 and NO _ x, and the emission concentration is periodically changed. In this paper, the simultaneous removal of SO _ 2 and NO _ x in the flue gas of the coke oven was studied by the oxidation-absorption method, and it was found that the oxidizing agent, the process condition and the catalyst were the important factors of the integration of high-efficiency desulfurization and denitrification. The coke oven flue gas with the flow rate of 2000m ~ 3/ h (180oC) is selected as a pilot test object, and the integrated process of oxidation absorption and desulfurization and denitrification is designed according to the characteristics of the coke oven flue gas. And the oxidation efficiency of the oxidizing agent is improved by using the laboratory self-made catalyst as the oxidizing agent and the ammonia water of the flue gas denitration by using the O3 and the H2O2 as the absorbent. The NO is oxidized in two stages, most of the NO in the first stage is oxidized by ozone, the remaining NO is oxidized by H2O2 in the second stage, and the oxidation product enters the absorption tower with the flue gas. In the absorption tower, the high-valence NO _ x and SO _ 2 are absorbed by the absorption liquid to form the ferric nitrate and the sulfur sulfate, and can be used as a chemical fertilizer raw material. The pilot test found that when the ammonia concentration was 1 wt. The removal rate of SO _ 2 is 98% when the gas-to-gas ratio is 5 L/ m ~ 3, and NO is basically not removed. in that experiment of ozone oxidation and denitration, the removal rate of NO is reach 94 percent when the molar ratio of the ozone injection to the NO in the flue gas is 0.8, the amount of the ozone is increased, the NO removal rate is not obviously change, and after the self-made ozone-enhanced catalyst is used, And the ozone and the gaseous water react on the surface of the catalyst to generate hydroxyl radicals so as to improve the oxidation efficiency of the ozone, and when the O3: NO (mol: mol) is 0.7, the denitration efficiency can reach more than 85 percent. In the experiment of hydrogen peroxide oxidation and denitration, the temperature is an important factor which influences the oxidation and denitration of hydrogen peroxide, and the denitration efficiency of the gaseous hydrogen peroxide is higher than that of the liquid hydrogen peroxide. The removal rate of nitrogen oxide is 31.4% when the molar ratio of H2O2 to NO is 1.5 when the temperature of the flue gas is 120oC and the gaseous feed of the hydrogen peroxide is used as the catalyst. The influence of the flue gas temperature and the dosage of the oxidant on the removal rate of SO _ 2 and NO was studied by using the Aspen Plus large-scale simulation software. The effect of the flue gas temperature and the dosage of the oxidizing agent on the removal rate of SO _ 2 and NO was investigated. The data support was provided for the engineering application.
【學(xué)位授予單位】：濟(jì)南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：X784
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