本文選題：高濃度NOx　切入點：分級氧化　出處：《湘潭大學》2015年碩士論文　論文類型：學位論文

【摘要】：目前NOx漸漸取代SO2成為大氣污染最主要的污染物,對其進行治理迫在眉睫,現有的高濃度NOx廢氣治理技術都有不足,難以達標排放,需要技術創(chuàng)新。本文針對高濃度NOx廢氣的凈化,設計了分級氧化尿素還原吸收的凈化方案,并進行了小試、放大實驗和中試研究。首先以鼓泡吸收器為吸收裝置,模擬某石化企業(yè)生產催化劑產生的高濃度NOx廢氣進行了小試研究,NOx濃度100000 mg/m3,NO/NO2的體積比為2,實驗結果表明,分級氧化尿素還原吸收工藝基本能夠滿足NOx達標排放,經過第一級氧化NOx出口濃度為2100 mg/m3左右,經過第二級氧化NOx出口濃度為300 mg/m3,第三級氧化最終出口濃度為100 mg/m3左右。隨后在內徑φ100 mm的有機玻璃篩板塔中進行了放大實驗,篩板開口率為7.65%,分三個吸收段。并進一步深入討論分級氧化階段,氧化罐中停留時間與氧化度的關系,停留時間對吸收塔內吸收段脫硝效率的影響,尿素濃度、液氣比對NOx去除率的影響。實驗結果表明,氧化度越大所需停留時間越長,在一級氧化罐中停留時間為150s,第二、三級氧化罐中停留時間為4min,尿素吸收液濃度為10%,塔內液氣比為3.5 L/m3時,吸收塔內脫硝效率可達99.87%,最終出口濃度可達到100 mg/m3左右。最后,在小試和放大實驗的基礎上在某催化劑企業(yè)現場開展中試實驗研究,以該催化劑企業(yè)生產廢氣為煙氣,自制吸收裝置,以尿素為吸收液,調節(jié)空塔氣速、氧化劑濃度、循環(huán)水、吸收液濃度等實驗條件,得出本中試裝置最佳實驗條件為,空塔氣速0.016m/s、O3/NOx為0.17、尿素濃度20%時,本吸收裝置可達最佳吸收效果,出口NOx為100 mg/m3左右。本文通過小試、放大、中試實驗研究了分級氧化處理濃度高達100000 mg/m3的NOx(NO/NO2=2)的性能,NOx出口濃度為100 mg/m3,滿足我國最新NOx排放標準,是可行的新工藝。
[Abstract]:At present, NOx is gradually replacing SO2 as the most important pollutant in air pollution. It is urgent to treat it. The existing treatment technology of high concentration NOx exhaust gas is insufficient, and it is difficult to meet the emission standard. Technology innovation is needed. In this paper, the purification scheme of redox absorption of NOx waste gas with high concentration is designed, and small scale experiment, scale up experiment and pilot-scale study are carried out. Firstly, bubbling absorber is used as absorber. The volume ratio of 100000 mg / m ~ (3) no ~ (2) O _ (2) to 100000 mg / m ~ (3) O _ (3) no _ (2) in high concentration NOx waste gas produced by a petrochemical plant was simulated. The experimental results showed that the stepwise redox urea reduction absorption process could basically meet the standard of NOx emission. After the first oxidation of NOx was about 2100 mg/m3, after the second stage of oxidation the outlet concentration of NOx was 300 mg / m 3, the final outlet concentration of the third stage of oxidation was about 100 mg/m3. Then the amplification experiments were carried out in the inner diameter 蠁 100mm column of organic glass sieve plate. The opening rate of sieve plate is 7.65, which is divided into three absorption sections. The relationship between residence time and oxidation degree in oxidation tank, the effect of residence time on denitrification efficiency of absorption section in absorption tower, urea concentration, urea concentration are discussed. The experimental results show that the longer the residence time is, the longer the residence time in the primary oxidation tank is 150 s. When the residence time is 4 minutes, the concentration of urea absorbent is 10 and the ratio of liquid to gas is 3.5 L / m ~ 3, the denitrification efficiency can reach 99.87 and the final outlet concentration is about 100 mg/m3. On the basis of small scale test and scale up experiment, a pilot experiment was carried out in a catalyst enterprise. The waste gas produced by the catalyst enterprise was used as flue gas, the absorption device was made by oneself and urea was used as the absorbent liquid to adjust the air velocity, the concentration of oxidant and the circulating water. The optimum experimental conditions are as follows: the gas velocity of the empty tower is 0.016 m / s / s O _ 3 / no _ x = 0.17, and the concentration of urea is 20%, the best absorption effect can be achieved, and the NOx at the outlet is about 100 mg/m3. In this paper, the gas velocity of the empty tower is 0.016 m / s / s O _ 3 / no _ x = 0.17, and the outlet NOx is about 100 mg/m3. The performance of no _ x / no _ 2 / no _ 2 / no _ 2 / no _ 2 / no _ 2 / no _ x / no _ 2O _ (2) treated by staged oxidation with concentration up to 100000 mg/m3 was studied in a pilot scale.
【學位授予單位】：湘潭大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：X701

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本文編號：1616538