直立型ESFR喷头货架实体火试验研究

为研究直立型ESFR喷头对高架仓库的保护性能以及配水支管对灭火性能的影响,将K202直立型ESFR喷头安装在DN50的配水支管上,在10.5 m净空高度下分别开展5层和6层货架的实体火试验,测量喷头开启时间、开启数量、吊顶下温度、点火位置正上方钢梁温度及货品烧损量等试验参数.结果表明:不超过3只的ESFR喷头会在火灾初期迅速启动,喷头启动后,火势得到快速抑制,整个试验过程中火均未蔓延至邻排货架.K202直立型ESFR喷头能有效保护储物为箱装不发泡塑料的高架仓库,外径不超过60 mm的配水支管或类似的障碍物对直立型ESFR喷头灭火性能无明显影响.     

台山电厂5号机组烟气脱硝液氨储存区设计

介绍了广东省台山电厂5号机组烟气脱硝工程选用液氨作为反应剂的工艺设计以及针对危险化学品液氨采取的一些具体措施,并对液氨储存区的设计提出了一些看法.     

中储式煤粉锅炉燃烧优化调整试验研究

为提高电厂锅炉燃煤煤质变差后锅炉运行的经济性,进行了燃烧优化调整试验,通过比较飞灰可燃物含量、锅炉热效率、排烟温度、制粉系统耗电率重新确定了制粉系统最佳出力下的经济煤粉细度,分析了制粉系统运行方式、二次风配风方式、过量空气系数、燃煤配比对锅炉运行经济性的影响,提出了锅炉更经济的运行工况。     

Measurement and Modelling of Ammonia Emissions at Waste Treatment Lagoon-Atmospheric Interface

Global emissions of ammonia are approximately 75 Tg N/yr (1 Tg =10¹²g). The major global source is excreta from domestic animals ( 32 Tg N ^-1yr^-1). Waste storage and treatment lagoonsare used to treat the excreta of hogs in North Carolina (NC). Proteins and nitrogen rich compounds in the lagoon are convertedto ammonia, through a series of biological and chemical transformations. The process of ammonia emission has been investigated using two different model approaches: (1) CoupledMass Transfer with Chemical Reaction Model (Model I), and (2)Mass Transport without Chemical Reaction Model (Model II). Asensitivity analysis is performed with the models, and the modelresults are compared with ammonia emission experiments at a swinewaste storage and treatment lagoon in NC using a dynamic emissionflux chamber.Results of model predictions of emission flux indicate an exponential increase in ammonia flux with increasing lagoontemperature and pH, a linear increase with increasing lagoontotal ammoniacal nitrogen (TAN), and a secondary degree increasewith the increasing wind speed. In addition, the fluxes predictedby Model I are consistently larger than fluxes predicted by Model II. Experimental values of flux agreed well with model predictions, with the experimental values lying in different positions between the two model predictions under different physical and chemical conditions. Further, when compared to diurnal and seasonal experimental flux values, Model I corroborates the results in calm meteorological conditions (windspeed U10 = 1.5 m s^-1). However, the observed results are better predicted by Model II during unstable conditions, when wind speeds are higher than 2.0 m s^-1 and physical transfer process functions dominate.     

Phosphorus Storage in Fine Channel Bed Sediments

Deposition and storage of fine sediment on channel beds represents an important component of a catchment’s sediment budget and can have important implications for sediment-associated P fluxes, due to storage and remobilisation, and for P concentrations through water–sediment interactions. Spatial and temporal variations in P content and storage in fine bed sediment have been studied in two UK lowland catchments, the Rivers Frome and Piddle in Dorset. Fine bed sediment was sampled in representative reaches on a bi-monthly basis using a re-suspension cylinder, and the resulting samples were analysed for total P, a range of P fractions and particle size. The results demonstrate significant spatial and temporal variability in PP concentrations and storage, with maximum and minimum P concentrations and storage occurring in late summer and winter, respectively. Temporal variations in concentrations reflect residence times of the sediment and ambient P concentrations, while variations in storage are mainly due to hydrological regimes. Spatial variations reflect catchment characteristics, the location of inputs and local variations in hydrological and channel bed conditions.     

脱硫石粉贮存库气化装置改造

对火电厂脱硫石粉贮存库运行过程中散装机出料口下料缓慢,进气母管及气化槽体中进粉等问题进行了分析,提出了改造对策,石粉贮存库气,石粉贮存气化装置改造后运行效果良好,以60t罐车为例,石粉的装车为例,石粉的装车时间同原来的30min减少到15min.     

POND SIZING FOR RATIONAL FORMULA HYDROGRAPHS1

ABSTRACT: The Modified Rational formula hydrograph and the Yarnell generalized rainfall chart are generally accepted procedures for sizing storm water detention ponds for small drainage areas. A procedure has been developed to choose the rainfall duration which, for a chosen return period, will result in the largest required storage volume of a detention pond. A graphical solution has been provided and its use has been described by application to an example.     

地下储气库工程竣工环境保护验收调查方法初探

随着天然气应用和天然气管道建设的不断加快,地下储气库的建设也随之不断发展。文章分析了地下储气库建设中存在的主要环境问题,阐述了地下储气库竣工环境保护验收调查的主要内容,提出了地下储气库竣工环境保护验收调查的技术路线和技术方法,从而有助于为地下储气库工程竣工环境保护验收调查提供参考。     

POTENTIAL FOR AUGMENTING WATER YIELD THROUGH FOREST PRACTICES IN WESTERN WASHINGTON AND WESTERN OREGON1

Western Washington and western Oregon comprise a water-rich region that has a very uneven annual distribution of both precipitation and streamflow. Highest demand for water coincides with lowest streamflow levels between July 1 and September 30 when less than 5 percent of annual water yield occurs. Increases in annual water yield in small, experimental watersheds in the region have ranged up to 600 mm after entire watersheds were logged and up to 300 mm in watersheds that were 25 to 30 percent logged. Most of the increase has occurred during the fall-winter rainy season, and yield increases have been largest during the wettest years. Estimated sustained increases in water yield from most large watersheds subject to sustained yield forest management are at best only 3-6 percent of unaugmented flows. Realistically, watersheds in this region will not be managed to produce more water. Water yield augmentation will continue to be only a small and variable by-product of logging. The utility of water yield augmentation is limited by its size and by its occurrence relative to the time of water demand. In some local areas, reduction of fog interception and drip or establishment of riparian phreatophytic hardwoods may reduce summer flows.