DBD技术脱除恶臭气体H_2S和CS_2的可行性

采用DBD技术脱除工业废气中的H2 S和CS2 .1 2kV的电压下 ,分压为 4kPa的H2 S ,放电 5s ,去除率接近1 0 0 % ;分压为 1 33kPa的CS2 ,放电 1 5s ,其去除率可达 80 % H2 S和CS2 的去除率都随其浓度的增加而下降 .在实验室研究的基础上 ,设计了废气处理量为 4 2 0m3/h、流速为 1 0m/s的DBD净化装置 ,进行了实际含H2 S和CS2 的工业废气净化研究 ,H2 S去除率可达 89% ,能量消耗为 5 2W·h/m3.结果表明DBD技术对于处理含硫恶臭工业废气 。

Experimental Investigation of the Flame Propagation and Flashback Behavior of a Green Propellant Consisting of N2O and C2H4

Regarding the research on alternatives for monopropellant hydrazine, several so called green propellants are currently under investigation or qualification. Aside others, the DLR Institute of Space Propulsion investigates a N20/C2I-I4 premixed green propellant. During the research activities, flashback from the rocket combustion chamber into the feeding system has been identified as a major challenge when using the propellant mixture. This paper shows the results of ignition experiments conducted in a cylindrical, optical accessible ignition chamber. During the ignition and flame propagation process, pressure, temperature and high-speed video data were collected. The high speed video data were used to analyze the flame propagation speed. The obtained propagation speed was about 20 rn/s at ignition, while during further propagation of the flame speeds of up to 120 m/s were measured. Additionally, two different porous materials as flame arresting elements were tested： Porous stainless steel and porous bronze material. For both materials Peclet numbers for flashback were derived. The critical Peclet number for the sintered bronze material was around 20, while for the sintered stainless steel the critical Peclet number seems to be larger than 40. Due to the test results, sintered porous materials seem to be suitable as flashback arresters.

Utilization of fruit waste for H_(2)-rich syngas production via steam co-gasification with brown coal

In this work,to efficiently utilize waste fruit and low-rank coal for the hydrogen(H_(2))-rich syngas production,steam co-gasification of banana peel(BP)and brown coal(BC)was studied in a fixed-bed reactor.The results showed that the gasification rate of BC was highly enhanced after mixing it with BP and the obvious synergistic effect was observed in all investigated three mixing weight ratios(i.e.,1:1,1:4,4:1),resulting in a higher carbon conversion as well as a H_(2)-rich gas production yield for the co-gasification.However,the extent of promotion by synergistic effect was affected by the reaction temperature,mixing ratio,and steam amount.It was found that the high potassium(K)species content in the BP provided the catalytic effect not only on water-gas shift reaction but also on tar reforming/cracking,thereby enhancing the gasification of BC.In addition,it is confirmed that steam should be an important factor to promote the synergistic effect and H_(2)-rich gas production.

氯胺酮复合乌司他丁对大鼠内毒素性急性肺损伤的影响

目的 探讨氯胺酮复合乌司他丁对大鼠内毒素性急性肺损伤（acute lung injury, ALI）的影响。方法 成年雄性SD大鼠100只，体重280 g ~ 320 g，采用计算机简单随机分组法随机分为5组（每组20只）：对照组（C组）、内毒素组（L组）、氯胺酮组（K组）、乌斯他丁组（U组）、氯胺酮复合乌斯他丁组（K＋U组）。除C组外，其余大鼠腹腔注射0.03 %脂多糖（lipopolysaccharide, LPS）1 mg/kg，注射后16 h时，由尾静脉再次注射0.l % LPS 1.5 mg/kg，建立大鼠ALI 模型。U组、K＋U组分别在第2次注射LPS后经尾静脉注射乌司他丁 50 000 U/kg，注射乌司他丁后即刻，K 组、K＋U 组经尾静脉以微量泵持续输注氯胺酮 10 ㎎？㎏-1？h-1，其余组注射等容量生理盐水。于第2次注射 LPS 后1、2、3、4 h （T1~4）时，各组取5只大鼠，抽取腹主动脉血样0.5 ml，测定氧分压（PaO2），抽取下腔静脉血样2 ml，测定血清肿瘤坏死因子（tumor necrosis factor，TNF）-α和白介素（interleukin，IL）-6浓度；放血处死大鼠，取右肺上叶组织，光镜下观察肺组织病理学结果，进行肺组织病理半定量评分及测定核因子（nuclear factor-κB, NF-κB）抑制蛋白α （inhibitor of nuclear factor-κBα, IκBα）表达；取右肺中叶组织100 mg测定肺组织NF-κB活性；取右肺下叶组织，计算肺湿干重比（W/D）。结果 与C组比较，L组、K组、U组和K＋U组PaO2降低，血清TNF-α、IL-6浓度和肺组织NF-κB活性升高，IκBα表达降低， W/D升高（P〈0.01）；与L组比较，K组、U组和K＋U组PaO2升高，血清TNF-α、IL-6浓度和肺组织NF-κB活性降低，IκBα表达升高，W/D降低，肺组织病理评分降低 （P〈0.05或0.01）；与K组和U组比较，K＋U组各时点PaO2升高，血清TNF-α、IL-6浓度和肺组织NF-κB活性（2.49±0.23）降低，IκBα表达（35.1±3.4）升高，W/D（4.91±0.16）降低，肺组织病理评分（7.8±0.8）降低（P〈0.05或0.01） 。结论 氯胺酮复合乌司他丁可减轻大鼠ALI，较两者单独应用效果显著。