活性焦改性及脱硫效果研究

采用加入金属氧化物的方法对活性焦进行改性 ,研究金属氧化物的加入对活性焦脱硫性能及再生性能的影响 ,并对活性焦改性前后的性能进行了对比实验     

活性焦烟气脱硫技术

贵州宏福实业开发有限总公司等三家单位联合开发的“活性焦烟气脱硫技术”通过了科技部863专家组的验收。贵州省环境监测中心的测试结果表明，通过这一技术净化后的含硫烟气．脱硫率达到95％以上。     

彬县煤活性焦表面性质对其脱硫性能的影响

在流化床上用彬县煤制备了脱硫用活性焦样品，使用XPS等分析手段考察了制得的活性焦表面性质对其脱硫性能的影响．分析了活性焦表面性质与其脱硫性能之间关系．结果表明，活性焦表面多环芳香平面层上的离域π电子系统是脱硫用活性焦碱性的主要来源，并在活性焦吸附转化烟气中的SO2过程中起着重要的作用，在与O2和H2O共存的情况下，SO2可能被在活性焦表面碱性活性位上催化生成的H2O2氧化为硫酸．随着活化强度的增加，活性焦脱硫能力增强，但是活化温度、活化时间以及活化介质中的水蒸汽浓度对活性焦表面碱性活性位影响则有所差异。     

工业烟气脱硫脱硝新技术研究进展

依据大量文献,综述了近几年来从工业烟气中脱除有害气体SO_2和NO_(?)的新技术。着重论述了国外在高能电子束辐射技术和脉冲流光电晕放电技术方面的新进展。通过比较单位能耗的脱除率,指出了电晕放电技术的优越性。并概述了近几年来作者参与脉冲电晕放电脱硫脱硝的研究情况,提出了进一步研究此课题的建议。     

电厂烟气脱硫脱硝技术研究分析

烟气脱硫脱硝技术的应用,需既能符合电厂运行的实际需求,又能确保脱硫脱硝技术具备节能的效益,最大化的体现脱硫脱硝技术的环保水平,因此,本文通过对烟气脱硫脱硝技术进行研究,分析其在电厂运行中的应用。     

燃煤工业锅炉烟气湿法脱硫脱硝技术研究

电厂作为燃煤工业的重要组成部分,生产过程中产生的烟气中含有大量的SOx与NOx,其对环境造成的影响较大。在持续发展理念背景下,必须就电厂燃煤生产烟气排放处理技术进行研究,选择合适的脱硫脱硝技术对烟气进行处理。湿法脱硫脱硝技术是现在比较常用的一种,并且在实际应用上也取得了一定的效果。本文对电厂燃煤烟气脱硫脱硝技术进行了分析,并着重对湿法脱硫脱硝技术系统进行了研究。     

氯酸盐复合吸收剂同时脱硫脱硝试验研究

通过一种新型的NaClO/NaClO2复合吸收剂,在小试级别的喷淋塔装置内进行同时脱硫脱硝试验研究.通过考察各种工艺运行参数对脱除效率的影响,确定了NaClO/NaClO2复合吸收液同时脱硫脱硝的工艺条件:NaClO浓度为4mmol/L,NaClO2浓度为2mmol/L,吸收液初始pH值为5.5,液气比为25L/m3,烟气流量为20m3/h,反应温度为50℃.最佳工艺条件下,平均脱硫脱硝率可分别达到99.7%,93.9%.NaClO/NaClO2复合吸收剂成本比单纯使用NaClO2要低,而脱硝效率有较大提高.     

“高效流态化滤泡法烟气脱硫脱硝装置”通过鉴定

江苏省盐城市东大热能机械制造有限公司研制的、广泛适用于电站锅炉、工业锅炉和工业窑炉烟气治理的“高效流态化滤泡法烟气脱硫脱硝装置”,在北京通过了科技成果鉴定。     

烟气脱硫工程中脱硫率、烟气温度稳定性控制的分析及解决方法

介绍了回流式循环流化床烟气脱硫技术的原理;阐述了控制系统的实现过程;细致分析了烟气脱硫工程中出现的烟气温度、脱硫率调节控制跟踪滞后问题的原因,并有针对性地提出了解决办法.从运行的实际效果来看,方法行之有效,对同类问题的解决提供了有益的借鉴.     

烟气中气体组分对活性半焦脱硫性能的影响

用自制的活性半焦颗粒在SO2-O2-N2-H2O(g)体系下,在动力学控制条件范围内,考察了SO2浓度为0.08%～0.2%,O2浓度为4%～10%,H2O(g)浓度为6%～14%,反应温度为368～398 K范围内SO2、O2、H2O(g)及温度等对活性半焦脱硫性能的影响。结果表明:脱硫速率对O2浓度变化最不敏感,SO2次之;对H2O(g)的浓度变化最为敏感,且存在一个最佳的浓度值(8%)。     

烟气联合脱硫脱氮技术的模糊综合评判

在选择联合脱硫脱氮技术过程中,涉及因素较多且各因素具有不同程度的模糊性,使采用模糊综合评判成为最佳选择。通过合理确定因素集、评语集、评判矩阵、权重,建立了锅炉烟气联合脱硫脱氮技术的二级模糊综合评判模型。通过选择“max-product”和“add-product”两种算子,使评判模型对各种因素既全面考虑又突出重点。以一定条件下的电厂联合脱硫脱氮技术选择为例,利用此模型对8种主要的联合脱硫脱氮技术(活性炭法、CuO法、NOXSO法、SNAP法、WSA-SNOX法、SNRB法、Parsons、电子束法)进行了模糊综合评判,得到了客观的评价结果。     

利用臭氧同时脱硫脱硝过程中NO的氧化机理研究

NO的氧化过程是实现臭氧氧化同时脱硫脱硝技术的关键，在构建65步臭氧氧化NOx的详细化学反应机理的基础上，通过敏感度分析确定了NOx的主要氧化历程，并与机理试验结果进行了对比验证.结果表明NOx的氧化是逐级进行的，首先NO氧化生成NO₂，当O₃过量后生成NO₃和少量N₂O₅.在n(O₃)∶n(NO)<1的情况下主要产物为NO₂，NO₃、N₂O₅只有在O₃过量条件下才会产生.在多层栓塞流反应器中进行的试验结果与模拟结果吻合良好，进一步验证了本反应机理的正确性.在机理分析与试验中均发现有N₂O的生成，但其生成量很小，试验中发现均小于4×10-6.试验结果发现在100 ℃和200 ℃条件下，温度变化对于O₃与NO之间的氧化反应影响很小，当n(O₃)∶n(NO)=1.0时，分别达到了89.2％和85.0％的氧化效率.     

Possibility of Reducing Formations of NOx and SO2 Simultaneously during Coal Combustion

Comparing with other NO_x and SO_2 control technologies, in-bed reducing NO_x and SO_2 simultaneously during coal combustion may lower the investment and operation cost. However, there are several possible contradictions between the reduction of NO_x and the capture of SO2 during combustion: 1) CO rich atmosphere is favorable for the reduction of NO_x, whereas O_2 rich favorable for the capture of SO_2; 2) higher preheating temperature of coal is favorable for reducing NO_x, but unfavorable for reducing SO_2; 3) sulphation of some minerals may deactivate their catalytic effect on the reduction of NO_x. The attempts to eliminate such contradictions by coating coal granules with thin layer of monometallic oxides and mixed oxides were proposed. Ni_2O_3 and Fe_2O_3 showed high activity on NOx reduction and CaO and Cr_2O_3 showed good effect on sulfur capture. The mixed metallic oxides, e.g., Fe_2O_3NiO, etc., showed effective for both NO_x reduction and SO_2 retention. It is possible to in-bed reduce NO_x and SO_2 simultaneously if the adhering materials are properly chosen to be difunctional materials of both active catalysts for NO_x reduction reactions and better sorbents for SO_2 retention.     

液相催化氧化脱除烟气中SO2和NOX的机理讨论

对液相催化氧化SO2和NOx进行了较为系统的理论讨论,综述了液相催化氧化吸收SO2和NOx以及过渡金属离子的催化作用,探讨了液相溶液中SO2和NOx同时存在时可能发生的反应,为今后研究SO2和NOx的湿式脱除提供参考。     

Pilot study on combined process of catalytic ozonation and biological activated carbon for organic pollutants removal

A combined process of catalytic ozonation in the presence of a novel heterogeneous catalyst and biological activated carbon was investigated for the removal of priority control organic pollutants, the reduction of genotoxicity, and the improvement of biodegradable dissolved organic carbon (BDOC). Results confirm that the catalytic ozonation has higher effectiveness for the removal of refractory harmful organic pollutants, the reduction of genotoxicity and the increase of bio-degradability of organics than ozonation alone, which results in lower pollution load for subsequent biological activated carbon process, and then leads to less organic pollutants penetrating biological activated carbon. The novel catalytic ozonation with this combined process exhibits excellent performance to guarantee the safety of drinking water.     

A2N/BAF组合工艺深度除磷脱氮研究

针对我国南方低碳氮比生活污水,开展以BAF为硝化单元的A2N工艺小试研究,针对超越污泥携带NH4+导致出水超标及二沉池出水SS偏高时TP超标问题,进一步研究增加二级BAF单元的处理效果,形成A2N/BAF工艺.结果表明:A2N段对COD、NH4+-N、TP平均去除率分别为82.0%、70.9%、90.0%;当进水NH4+-N超过40.0 mg/L时,二沉池出水NH4+-N超过10.0 mg/L;二级BAF单元能够硝化二沉池出水NH4+-N及截留SS,最终出水COD、TP、NH4+-N、NO3--N、SS平均质量浓度分别为35、0.35、1.06、8.01、7 mg/L,稳定达到一级A标准.     

Effects of surface chemical properties of activated coke on selective catalytic reduction of NO with NH3 over commercial coal-based activated coke

Surface chemical properties of typical commercial coal-based activated cokes were characterized by X-ray photoelectron spectroscopy (XPS) and acid-base titration, and then the influence of surface chemical properties on catalytic performance of activated cokes of NO reduction with NH₃ was investigated in a fixed-bed quartz micro reactor at 150 °C. The results indicate that the selective catalytic reduction (SCR) activity of activated cokes with the increase of its surface acidic sites and oxygen content, obviously, a correlation between catalytic activity and surface acidic sites content by titration has higher linearity than catalytic activity and surface oxygen content by XPS. While basic sites content by acid-base titration have not correlation with SCR activity. It has been proposed that surface basic sites content measured by titration may not be on adjacent of acidic surface oxides and then cannot form of NO₂-like species, thus the reaction of reduction of NO with NH₃ have been retarded.     

SO2/Hg removal from flue gas by dry FGD

To study the mechanism of SO2 and Hg removal from flue gas,an experimental packed bed reactor was designed to simulate the dry FGD,where a mixture of lime and fly ash in ratio 1∶3 w/w was used as the S...     

Theoretical evaluation on nitrogen removal of step-feed anoxic/oxic activated sludge process

Topreventeutrophicationoftraditionalbiologicaltreatmenteffluent,minimizethedischargeratebywastewaterreuse,andtoalleviateawatersourcecrisis,researchonbiologicalremovalnitrogenandphosphorusarebeingdevelopedallovertheworld.Typicalbiologi calnitrogenremovalpr…