预防餐饮油烟污染利国利民

俗话说"民以食为天".城市生活和经济发展衍生出的各类大小餐馆,为繁忙的都市人提供了快捷方便的餐饮服务,也为经济繁荣贡献了不可忽视的力量.餐馆位于城市中心区是城市生活的必需.然而,由于城市的餐馆深入社区,其烟气排放已成为环保投诉较多的问题,餐饮的烟气与噪音对周边居民生活环境的污染日益加剧.     

Study on the removal of NOx from simulated flue gas using acidic NaClO2 solution

The study on the removal of NOx from simulated flue gas has been carded out in a lab-scale bubbling reactor using acidic solutions of sodium chlorite. Experiments were performed at various pH values and inlet NO concentrations in the absence or presence of SO2 gas at 45℃. The effect of SO2 on NO oxidation and NO2 absorption was critically examined. The oxidative ability of sodium chlorite was investigated at different pH values and it was found to be a better oxidant at a pH less than 4. In acidic medium, sodium chlorite decomposed into C102 gas, which is believed to participate in NO oxidation as well as in NO2 absorption. A plausible NOx removal mechanism using acidic sodium chlorite solution has been postulated. A maximum NOx removal efficiency of about 81% has been achieved.     

Removing and recycling mercury from scrubbing solution produced in wet nonferrous metal smelting flue gas purification process

Wet purification technology for nonferrous metal smelting flue gas is important for mercury removal; however, this technology produces a large amounts of spent scrubbing solution that contain mercury. The mercury in these scrubbing solutions pose a great threat to the environment. Therefore, this research provides a novel strategy for removing and recycling mercury from the scrubbing solution, which is significant for decreasing mercury pollution while also allowing for the safe disposal of wastewater and a stable supply of mercury resources. Some critical parameters for the electrochemical reduction of mercury were studied in detail. Additionally, the electrodeposition dynamics and electroreduction mechanism for mercury were evaluated. Results suggested that over 92.4% of mercury could be removed from the scrubbing solution in the form of a Hg-Cu alloy under optimal conditions within 150 min and with a current efficiency of approximately 75%. Additionally, mercury electrodeposition was a quasi-reversible process, and the controlled step was the mass transport of the reactant. A pre-conversion step from Hg(Tu)₄²⁺ to Hg(Tu)₃²⁺ before mercury electroreduction was necessary. Then, the formed Hg(Tu)₃²⁺ on the cathode surface gained electrons step by step. After electrodeposition, the mercury in the spent cathode could be recycled by thermal desorption. The results of the electrochemical reduction of mercury and subsequent recycling provides a practical and easy-to-adopt alternative for recycling mercury resources and decreasing mercury contamination.     

Fe2+EDTA络合-铁屑还原连续脱除烟气中NO

研究了铁屑塔式反应器连续脱除烟气中NO的过程,建立了该过程的数学模型,并对其主要影响因素进行了讨论.结果表明,铁屑塔式反应器可连续稳定地脱除烟气中NO,进气NO浓度的变化对脱硝效率没有影响,脱硝效率随烟气流量的增加而下降,随脱硝溶液流量和填料层高度的增加而增加.所建模型的计算值和实测值能够很好地吻合,该模型可用于预测脱硝过程参数对脱硝效率的影响.     

酸改性对褐煤半焦脱除烟气中元素态汞性能的影响

为减少燃煤烟气中零价汞的排放,利用HCl和HNO3溶液对褐煤半焦改性研制了一种高效、低成本的吸附剂.运用酸碱滴定、Boehm滴定、BET、SEM和FTIR等技术对半焦吸附剂的表面特性进行表征与分析,利用固定床吸附实验装置及烟气测汞仪在线考察了半焦吸附剂对气态Hg0的吸附特性.结果表明,酸改性使半焦灰分含量降低,增加了半焦比表面积和羧基、酚羟基等官能团含量.酸改性处理可提高半焦对元素态单质汞的脱除效率,特别是盐酸溶液改性褐煤半焦可使吸附温度为140℃时的脱汞效率显著提高,这与改性半焦表面羧基、酚羟基和C-Cl官能团的含量及性质有关,半焦表面这些官能团能为Hg0的化学吸附提供活性位.     

次氯酸钠湿法烟气脱硝及同时脱硫脱硝技术研究

采用NaClO作氧化吸收剂,在鼓泡反应装置进行了湿法烟气脱硝实验研究,考察了NaIO、NO浓度、液相温度、气体流量、pH对脱硝效率的影响以及SO2对同时脱硫脱硝效率的影响,并结合液相产物分析探讨了同时脱硫脱硝反应机理.研究结果表明,pH值是影响活性成分HClO存在形式的重要因素,同时也是影响氧化吸收的关键因素;在一定范...     

利用燃煤锅炉烟道气处理工业废水的理论与实践

阐述了燃煤锅炉烟道气的主要化学成分及处理废水的机理 ,介绍了锅炉烟道气处理废水的研究与应用     

硅铁炉生产工艺及烟气处理

硅铁电炉目前应用比较广泛,分析硅铁的生产工艺和烟气处理不仅是完成节能减排的需要,也是保护环境的重要手段。     

Experimental and mechanism studies on seawater flue gas desulfurization

ＩｎｔｒｏｄｕｃｔｉｏｎＩｎｓｔａｌｌａｔｉｏｎｏｆｓｃｒｕｂｂｅｒｓｏｒｔｈｅｕｓｅｏｆｌｏｗｓｕｌｆｕｒ ｃｏｎｔａｉｎｉｎｇｃｏａｌａｒｅｔｗｏｏｐｔｉｏｎｓｕｓｅｄｂｙｐｏｗｅｒｐｌａｎｔｓｔｏｒｅｄｕｃｅＳＯ2 ｅｍｉｓｓｉｏｎｓ.ＴｈｅｍａｊｏｒｉｔｙｏｆｐｏｗｅｒｐｌａｎｔｓｃｏｎｔｒｏｌＳＯ2 ｅｍｉｓｓｉｏｎｓｕｓｉｎｇｌｉｍｅｂａｓｅｄｓｃｒｕｂｂｉｎｇ ,ａｌｔｈｏｕｇｈｔｈｉｓｄｅｓｕｌｆｕｒｉｚａｔｉｏｎｐｒｏｃｅｓｓｈａｓａｎｕｍｂｅｒｏｆａｄｖａｎｔａｇｅｓ,ｉｔａｌｓｏｈ…     

Desulfurizing absorbent for flue gas and its absorption mechanism

A new desulfurizing absorbent for flue gas,i.e.,an organic physical solvent of DMSO(dimethyl sulfoxide) mixed with a relatively small amount of chemical solvent(Mn^2 ) was studied.Compared with pure physical solvent of DMSO,the purification efficiency of the new absorbent was improved .And its absorption and reaction mechanism are discussed.     

NaClO2海水溶液强化烟气脱硝效果的实验研究

海水中富含多种盐类,具有一定碱性,是天然的缓冲剂,在脱硫脱硝方面具有良好的应用前景.利用不同浓度的NaClO_2溶液进行废气循环喷淋脱硝实验.结果表明,NaClO_2模拟海水溶液与NaClO_2淡水溶液都能将NO完全脱除,且当NO完全被脱除时,模拟海水溶液的持续时间比淡水溶液更长,模拟海水中所含有的少量HCO_3~-和OH~-是造成这种差异的主要原因.滴定实验结果显示0.066 mmol的HCl就可使NaClO_2淡水溶液的pH值降到7,而NaClO_2模拟海水溶液的pH值降到7需要0.114 mmol的HCl;在循环喷淋脱硝过程中NaClO_2模拟海水溶液的pH值基本维持在7以上.离子色谱检测结果显示脱硝后溶液中主要阴离子为Cl~-和NO_3~-.基于质量平衡计算结果,当NaClO_2浓度为20 mmol·L~(-1)时,在脱硝过程中淡水溶液中NaClO_2的利用率为56%,而模拟海水溶液中NaClO_2的利用率可达67.25%,提高幅度为20.1%.