给水

So the proposed method in this dissertation not only meet the requirements for fossil-fuel unit set in GB/T 12145-1999, but also can effectively restrain condensate and feed water system corrosion. Thereby the proposed method can reduce the loss by corrosion's leading accident, lower Fe content in boiler feed water, slow the boiler's scaling speed, delay boiler's chemical cleaning interval, effectively enhance unit's reliability, usability and using life and solve the problem of poisonous chemical deoxidant. So the proposed method can economize substantial expense for power plant.

所以，本文所提出的汽包炉有限氧化性水化学工况不但能满足GB/T12145-1999中对火力发电机组及蒸汽动力设备的要求，而且可有效抑制凝结水和给水系统的腐蚀，减少因这些部位腐蚀损坏而引发的事故停机损失，降低锅炉给水中的金属含量，减轻炉内的结垢速度，延长锅炉的酸洗间隔，有效提高机组的可靠性、可用率和使用寿命，同时也解决了有毒化学除氧剂的使用问题，为电厂节省大笔运行费用。

water distribution networks of small towns ; network theory ; dynamic programming ; optimum design ; time-dependent electricity price

再以给水管网年费用最小为目标，应用动态规划求出各管段管径。若小城镇给水管网对供水可靠性有

Based on the presentation of types of pressure reducing valve , how to select the position of pressure reducing valve in building fire water supply system was discussed in the design of No.

在介绍了减压阀类型的基础上，结合南宁世贸商城三号楼设计，探讨了减压阀在建筑消火栓给水系统中的位置选择问题，可供建筑消防给水系统设计和审查人员参考。

The water retaining capacity decreases with the increasing of diesel content and the decreasing of water bearing capacity and drainable porosity are relatively light. While, all of them reduce notably with the increasing of crude oil.

柴油污染对砂土容水度和给水度影响较小，持水度随含油率升高而减小；原油污染砂土孔隙度、持水度和给水度随含油率升高而减小。

In this thesis, firstly, some main models have been checked on their accuracy, and the reliability of MACORS code has been verified by the RELAP5/MOD2 code on five transient conditions for QSNP: loss of flow; loss of offsite power; incontrollable control rod withdrawal; the feed-water temperature increasing and the feed-water lost. The results obtained are very satisfactory. Secondly, MACORS is used to calculate the operating and accident transients for QSNP, and the analysis results are significant to real engineering. And finally for MNRS, MACORS is used to simulate the steady-state natural circulation heat-removed capacity and the transient behaviors from forced circulation to natural circulation. Some important conclusions are obtained by the analysis results.

本论文首先从各方面对核动力系统中最主要的、热工水力特性最复杂的反应堆和蒸汽发生器进行单独验证和理论分析，其次分别利用RELAP5/MOD2程序和MACORS程序对秦山核电站的双环路失流、全厂断电、反应性事故引入、主给水参数变化及丧失主给水五种瞬态工况进行了计算，结果符合很好，从而证明了本程序模型的准确合理性，选择数值方法的有效性和编制程序的正确性；尔后，利用MACORS程序对秦山核电站的多种运行及事故瞬态进行了分析，得出了具有工程价值的结论；对船用核动力装置的稳态自然循环载热能力以及相应参数的特性、强迫循环与自然循环的过渡工况等进行了仿真分析，所得结论对我国核动力船舶的设计，运行以及安全审评具有重要的意义。

In the light of the problem of the superstandard dissolved oxygen in the feed water of the direct air-cooled unit, analyzes on the causes of the superstandard dissolved oxygen in the feed water of the power plant s boilers, and puts forward some measures for the corresponding treatment.

针对直接空冷机组给水溶氧在实际运行中存在的超标问题，分析了造成电厂锅炉给水溶氧超标的原因并给出了相应的处理措施。

Design of drainage system discharges the way of draining water and the sureness of the system to include; calculation of the water force of the pipeline, mainly includes the design of the crosswise pipe slop and pipe diameter and the design of the vertical pipe diameter; the design of the way of ventilation and the calculation of the ventilative pipe; the design of the inspection shaft to choose the sewage waste water pump.

本建筑为河南省某管理局综合办公楼，对给水排水系统的要求较高。主要设计包括：给水方式的确定，竖向分区的合理划定，管材的确定，管道的水力计算，加压设备和贮水设备的选择计算。排水系统的设计主要包括：排水体制及其排水方式的确定；管道的水力计算（主要包括排水横管的坡度管径的确定，竖管管径的确定）；通气方式的确定以及通气管道的设计计算；集水坑的选择计算并由此选择潜污泵。

It uses middle extracted steam from steam turbine to heat the feetwater of boiler to the saturate temperature under working pressure of deaerator, so as to remove dissolved oxygen and other gases. To prevent or slow boiler and steam turbine as well as pipeline from corroding, and extend them service life, to ensure the operation of the power plant under safety economic condition. The high-pressure deaeator of 235t/h is a kind of mixture-type heater, which shall match with 55 MW units, whose deaerated head adopts a kind of new-style stuffing way with rotation film.

它是利用汽轮机的中间抽汽将锅炉给水加热到除氧器工作压力下的饱和温度，以达到除去给水中的溶解氧和其它气体，防止或减缓锅炉、汽机及其管道的腐蚀，延长其使用寿命，确保电厂的安全经济运行。235t/h高压除氧器是配55MW机组的混合式加热器。

In China, the balance has long been overweighed towards the social aspects and results in the current stagnancy of the water supply industry.

长期以来，给水工业在平衡自身经济效益与社会用水效益过程中，一直以满足于后者的要求为主导，造成了我国当前给水工业发展中的举步维艰。

Drainage system Design of drainage system is it discharge way drain off water the sureness of the system to include; Calculation of the flow of second of design of the sanitary sewage drainage pipeline of the building ; Is it in charge of sideways to drain off water , water conservancy in charge ofed to set up calculate and in charge of pipeline slope , pipe diameter and sureness of elevation sideways, set up calculation to in charge of pipe diameter , is it confirm pipe diameter size and position and sewage waste water design of the inspection shaft after discharging of breather pipe to come from this.

消火栓给水系统消火栓给水系统的设计内容具体包括：根据建筑物性质选择设计参数，包括每支水枪的射流量、消火栓的口径、水枪口径、龙带长度等；消火栓系统计算，具体包括消火栓的布置计算和消防立管和横支管的水力计算；减压孔板的计算；消火栓设施的确定，包括水泵结合起的设置、消防水泵和泵房的要求。

Cynanchum Lingtai apricot production in the average weight 65 grams, the brightly-colored fruit, juicy rich, sweet-sour taste, sweet from the nucleolus, when the late Qing Dynasty famous Shaanxi, Gansu provinces, the Qing imperial court Tongzhi tribute for years.

灵台生产的牛心杏平均单果重65克，果实色泽鲜艳，汁多味浓，甜酸适口，离核仁甜，清末时就驰名陕、甘两省，清同治年间曾为朝廷贡品。

Chenopodium album,Solanum nigrum, and Amaranthus retroflexus were very susceptible to the herbicides. Polygonum persicaria and Abutilon theophrasti were relatively less susceptible to the herbicides, and Lycopersicon esculentum was not susceptible to it. The relationship between reduction rates of weed biomass and PPM values of weed leaves 2,4, and 6 days after treatment was established.

供试的6种杂草对该混剂的敏感性存在显著差异：红心藜Chenopodium album、龙葵Solanum nigrum和反枝苋Amaranthus retroflexus对该混剂最敏感，ED90值分别为47.65、71.67和29.17g/hm2；春蓼Polygonum persicaria和苘麻Abutilon theophrasti敏感，ED90值分别为96.91、114.20g/hm2；而番茄不敏感。