磷矿浆液相同时脱硫脱硝实验研究

磷矿含有Fe_2O_3、MgO、MnO以及稀土元素La、Ce等,利用磷矿浆中过渡金属离子的催化作用,对烟气中的SO_2及NO_x进行催化氧化同时脱硫脱硝。结果表明,在反应温度25℃,气流速率0.15 L/min,含氧量21%,矿浆固液比20 g/40 mL条件下,脱硫率为100%持续的反应时间为100 min,脱硝率≥80%的反应时间为40 min。该法工艺简单,操作较简便,不会产生二次污染。     

液相同时脱硫脱硝技术研究进展

煤燃烧过程中排放的SO2和NOx是造成大气污染的主要成分,如何经济有效地控制二者的排放量是我国乃至世界节能减排领域中急需解决的关键问题。文章综述了国内外目前开发的液相同时脱硫脱硝技术,分析了各法的工艺特点和存在的问题．包括氧化吸收法、还原吸收法及湿式络合吸收法等,并对研究和应用进行了展望,对湿式脱硫脱硝一体化技术的应用具有一定参考价值。     

磷矿浆催化氧化湿法脱硫研究

讨论了磷矿浆湿法脱硫的方法。实验以磷矿浆为吸收剂与低质量浓度SO2气体进行液相催化氧化脱硫反应。失效的矿浆可回收生产磷化工产品。实验主要研究了影响反应的主要因素．找到了反应的最佳条件，并研究了矿浆中pH值的变化。采用这种方法脱硫，反应过程简单，脱硫效率高，且具有良好的经济效益。     

粉煤灰改性脱硫脱硝特性实验研究

以粉煤灰、石灰、添加剂为原料,通过湿法/干法制备了"富氧型"粉煤灰改性吸收剂.通过固定床实验,筛选出添加业氯酸钠(NaClO2)粉煤灰改性吸收剂,具有较好的脱硫脱硝效果;正交实验表明,Ca/(S+N)、温度是影响湿法制备的改性吸收剂脱硫脱硝的主要因素,且在实验条件下,脱硫率可以达到100%,脱硝率最高达到90%;而干法...     

磷矿浆催化氧化湿法脱硫研究(Ⅱ)

本文进一步讨论了磷矿浆湿法脱硫的方法.实验考察了磷矿浆液相催化氧化净化低质量浓度SO2气体时,气体氧体积分数和SO2气体质量浓度对净化脱硫的影响,得出了一条SO2质量浓度与氧气体积分数比与反应时间关系的线性方程,并在磷化工厂对此脱硫方法进行了现场试验,取得了较好的净化效果.     

火电厂脱硝技术与脱硫脱硝一体化分析

通过观察国内目前的电力企业发展状况可知,大多数电力企业都需要依靠火力来发电,不过因为火能源在燃烧时,会给大气以及环境带来较大的污染,不利于对环境的保护,也不符合可持续发展的要求,尤其是在发电时所形成的大量的粉尘以及烟雾,会严重的污染空气。在上述污染因素当中,硫污染所带来的危害是最大的,所以为了有效的防止污染现象,以火电厂脱硫技术为着眼点,展开深入的研究,并且剖析了未来脱硫脱硝一体化的发展方向,旨在可以更好地保护环境。     

碱性固废赤泥脱硫脱硝研究进展

介绍了赤泥的主要成分、堆存现状及存在的问题,阐述了赤泥脱硫、脱硝及同步脱硫脱硝的机理等方面的国内外进展研究,并对赤泥脱硫脱硝的方式及工业化应用作了综述.对比分析了赤泥浆液脱硫、赤泥附液脱硫、赤泥脱硫剂脱硫、赤泥基催化剂脱硫及赤泥基催化剂脱硝这五种不同方法各自的优缺点,总结认为赤泥分别对H2 S、SO2、NOx均有良好的去除效率,但同步去除H2 S、SO2、NOx等酸性气体的研究报道较少,而且赤泥堆存及排放对环境有着持续性负面影响,提出赤泥同步脱硫脱硝是今后赤泥用于废气净化的新方向.     

多钒取代磷钼杂多酸的脱硫脱硝性质研究

研究溶液的浓度、pH值、温度、烟气流量、含氧量等对4种多钒取代磷钼杂多酸水溶液的脱硫脱硝性质的影响。结果表明,Dawson-V6杂多酸具有最佳的脱硫脱硝效果,当杂多酸溶液浓度为3. 96 mmol/L,温度为25℃,p H为11,烟气流量0. 05 m3/h,含氧量9%时去除效果最好,杂多酸的脱硫效率可达100%,脱硝效率为79. 58%。对实际锅炉排放的烟气除尘,杂多酸对二氧化硫和氮氧化物的去除率分别可以达到60. 96%和35. 27%。     

多钒取代磷钼杂多酸的脱硫脱硝性质研究

研究溶液的浓度、pH值、温度、烟气流量、含氧量等对4种多钒取代磷钼杂多酸水溶液的脱硫脱硝性质的影响。结果表明,Dawson-V6杂多酸具有最佳的脱硫脱硝效果,当杂多酸溶液浓度为3. 96 mmol/L,温度为25℃,p H为11,烟气流量0. 05 m3/h,含氧量9%时去除效果最好,杂多酸的脱硫效率可达100%,脱硝效率为79. 58%。对实际锅炉排放的烟气除尘,杂多酸对二氧化硫和氮氧化物的去除率分别可以达到60. 96%和35. 27%。     

燃煤烟气同时脱硫脱硝技术研究进展

对比分析了传统的脱硫和脱硝技术,并从SO_2和NO_x脱除效率、脱硫和脱硝技术存在的问题等方面对传统的脱硫和脱硝技术做了对比分析。针对同时脱硫脱硝的技术,以氧化法、等离子体法、吸附法进行分类,分别从脱除原理、研究进展、优缺点等方面对臭氧氧化法、NaClO_2氧化法、电子束法、脉冲电晕法、钙基吸附法、碳基吸附法等进行了具体论述,对比了上述6种同时脱硫脱硝技术的工艺特征和经济性,并指出了未来我国脱硫和脱硝市场的发展方向。     

Simultaneous desulfurization and denitrification of sintering flue gas via composite absorbent

Experiments on simultaneous absorption of SO_2 and NO_X from sintering flue gas via a composite absorbent NaClO_2/NaClO were carried out. The effects of various operating parameters such as NaClO_2 concentration(ms), NaClO concentration(mp), molar ratio of NaClO_2/NaClO(M), solution temperature(TR), initial solution pH, gas flow(Vg) and inlet concentration of SO_2(CS) and NO(CN) on the removal efficiencies of SO_2 and NO were discussed. The optimal experimental conditions were determined to be initial solution pH = 6, TR=55 °C and M = 1.3 under which the average efficiencies of desulfurization and denitrification could reach99.7% and 90.8%, respectively. Moreover, according to the analysis of reaction products, it was found that adding NaClO to NaClO_2 aqueous solution is favorable for the generation of ClO_2 and Cl_2 which have significant effect on desulfurization and denitrification. Finally, engineering experiments were performed and obtained good results demonstrating that this method is practicable and promising.     

A composite absorption liquid for simultaneous desulfurization and denitrification in flue gas

A composite-liquid absorbent (CLA), NaClO/KMnO₄, for simultaneous desulfurization and denitrification (SDD) was studied in a homemade bubbling reactor. The experimental results showed that the CLA configured by sodium hypochlorite (NaClO) and potassium permanganate (KMnO₄) had a very good synergistic effect on SDD. The effects of NaClO concentration (C_Na), KMnO₄ concentration (C_K), gas space velocity (V_g), initial pH value, and temperature of the absorption liquid (T_s) on efficiencies of the SDD were investigated. Under the optimal reaction conditions, the best removal efficiencies were 100% for sulfur dioxide (SO₂) and above 94% for nitric oxide (NO). The ion chromatography and titration were used to analyze the changes of both the ion species and concentrations in the liquid before and after the reaction. According to the experiment results and related literature, the reaction mechanism of the SDD based on the CLA was proposed.     

Simultaneous desulfurization and denitrification of flue gas by pre-ozonation combined with ammonia absorption

A process of simultaneous desulfurization and denitrification of flue gas was conducted in this study. The flue gas containing 200 mg·m^-3 NO, 1000-4000 mg·m^-3 SO₂, 3%-9% O₂, and 10%-20% CO₂ was first oxidized by O₃ and then absorbed by ammonia in a bubbling reactor. Increasing the ammonia concentration or the SO₂ content in flue gas can promote the absorption of NO_X and extend the effective absorption time. On the contrary, both increasing the absorbent temperature or the O₂ content shorten the effective absorption time of NO_X. The change of solution pH had substantial influence on NO_X absorption. In the presence of CO₂, the NO_X removal efficiency reached 89.2% when the absorbent temperature was raised to 60 °C, and the effective absorption time can be maintained for 8 h, which attribute to the buffering effect in the absorbent. Besides, both the addition of Na₂S₂O₃ and urea can promote the NO_X removal efficiency when the absorbent temperature is 25 °C, and the addition of Na₂S₂O₃ had achieved better results. The advantage of adding Na₂S₂O₃ became less evident at higher absorbent temperature and coexistence of CO₂. In all experiments, SO₂ removal efficiency was always above 99%, and it was basically not affected by the above factors.     

Simultaneous desulfurization and denitrification of flue gas by pre-ozonation combined with ammonia absorption

A process of simultaneous desulfurization and denitrification of flue gas was conducted in this study. The flue gas containing 200 mg·m⁻³ NO, 1000–4000 mg·m⁻³ SO₂, 3%–9% O₂, and 10%–20% CO₂ was first oxidized by O₃ and then absorbed by ammonia in a bubbling reactor. Increasing the ammonia concentration or the SO₂ content in flue gas can promote the absorption of NO_X and extend the effective absorption time. On the contrary, both increasing the absorbent temperature or the O₂ content shorten the effective absorption time of NO_X. The change of solution pH had substantial influence on NO_X absorption. In the presence of CO₂, the NO_X removal efficiency reached 89.2% when the absorbent temperature was raised to 60 °C, and the effective absorption time can be maintained for 8 h, which attribute to the buffering effect in the absorbent. Besides, both the addition of Na₂S₂O₃ and urea can promote the NO_X removal efficiency when the absorbent temperature is 25 °C, and the addition of Na₂S₂O₃ had achieved better results. The advantage of adding Na₂S₂O₃ became less evident at higher absorbent temperature and coexistence of CO₂. In all experiments, SO₂ removal efficiency was always above 99%, and it was basically not affected by the above factors.     

烟气脱硫脱硝的应用与发展

发电锅炉烟气排放基本都需要脱硫脱硝,现在多采用钙基化合物与SO2生成石膏处理烟气,但该工艺不能充分利用产物和同时脱硫脱硝,脱硝采用SCR工艺。研究了炭基材料、金属氧化物和稀土元素作为催化剂在脱硫脱硝中的应用。     

液相脱氮工艺在环烷基润滑油生产中的应用

WSQ-2型脱氮剂应用于辽河环烷基润滑油基础油工业化生产,通过对反应温度、精制电压、混合器混合强度的调整,解决了影响脱氮装置长周期运行的问题;改善了润滑油的产品质量,达到了润滑油通用基础油标准中氧化安定性指标;精制油的收率大幅度提高,增加了改善润滑油质量的手段。     

电极生物膜反应器中同步硝化反硝化的研究

为研究分隔式电极生物膜反应器(C-BER)在限氧条件下的硝化/反硝化,溶氧质量浓度约1mg/L时考察了低碳氮比时微电解对脱氮效果的影响。发现脱氮作用主要为同步硝化反硝化(SND)。碳氮的量比为1,电流为5mA和15mA时的平均TN去除率分别为33%和45%;碳氮的量比为0.5,电流为25mA并将30%出水回流,TN去除率可达60%,其中自养反硝化脱氮占51%。碳氮的量比为1,电流为15mA时,NH3-N去除率约为50%。碳氮的量比为0.5,电流25mA,NH3-N去除率增加到70%。两极之间SND脱氮量占总氮去除的64%。试验表明,提高电流和出水回流都有利于限氧条件下发生SND;微电解能促进硝化和反硝化作用。     

燃煤烟气氧化脱硫脱硝技术进展

SO_2和NO_x是燃煤烟气的主要产物,严重威胁着生态环境和人类的生命安全。如何有效地减少大气污染物的排放已成为环保工作者研究的热点。介绍了燃煤烟气氧化脱硫脱硝一体化技术的最新研究进展,详细阐述了NaClO_2/NaClO、O_3、KMnO_4、H_2O_2及新型氧化脱硫脱硝技术原理、特点和存在问题,展望了脱硫脱硝技术的发展前景。     

燃煤烟气氧化脱硫脱硝技术进展

SO_2和NO_x是燃煤烟气的主要产物,严重威胁着生态环境和人类的生命安全。如何有效地减少大气污染物的排放已成为环保工作者研究的热点。介绍了燃煤烟气氧化脱硫脱硝一体化技术的最新研究进展,详细阐述了NaClO_2/NaClO、O_3、KMnO_4、H_2O_2及新型氧化脱硫脱硝技术原理、特点和存在问题,展望了脱硫脱硝技术的发展前景。