查询词典 feed water

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。

New type of water chemistry for utility drum boiler and its principle and characteristic Two kinds of water chemistry's main principle and characteristic are detailedly analyzed. Against the problem of high eroding speed, high Fe content in feed water and boiler water, high scaling speed, short chemical cleaning interval, needing poisonous chemical deoxidant, etc for drum boiler's deoxidization water chemistry and difficulty of using oxidation water chemistry, a new type of water chemistry is put forward on the basis of analyzing the characteristic of whole power station's water steam cycle system, principle of two kinds of water chemistry and their practical effect in every cycle stage. Considering two water chemistry's merit, a new water chemistry called Limited Oxidation Water Chemistry is put forward, which is a local slight oxidization no-deoxidant water chemistry. And the proposed method's principle, control parameter, applying condition, start-lay up and emergency measures are initially calculated and analyzed.

三、新型汽包炉水化学工况的提出及其原理和特点详细分析了国内外现行两大类水化学工况处理的核心原理和特点，针对现行汽包炉还原性水化学工况处理所存在的系统腐蚀速度相对较大、给水和炉水铁浓度高、锅炉结垢速度快、机组酸洗间隔短、无法避免有毒化学除氧剂的使用以及氧化性水化学工况在汽包炉机组上应用的困难等问题，在详细分析电站整个水蒸汽循环系统的特点、两类水工况处理的原理和对循环中各段处理的实际效果等的基础上，综合两者的优点，提出了一种新型的局部轻微氧化性无除氧剂汽包炉水化学工况－"汽包炉有限氧化性水化学工况"处理原理，并初步计算、分析和确定了该种新型水化学工况的主要工艺控制参数、应用条件、启停与紧急情况处理等。

Therefore, a control valve which maintains a constant feed water temperature is installed and used to control the flow rate of feed water to the AQC economizer.

因此，一个控制阀，供水温度保持恒定安装和使用来控制流量的AQC给水器。

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。

Though studying the rate of permeable salt of two-pass reverse osmosis system,the effects of feed water pH value, permeant flux ,feed water conductivity on the permeable salt rate of the system are analyzed and the change regular of permeable salt rate along with the three factors is summarized.

以二级反渗透系统的透盐率为研究对象，分析了给水pH值、产水通量、给水电导率对系统透盐率的影响，总结了透盐率随三个因素的变化规律，比较得出了其中给水pH值对透盐率的影响最大的结论，且给水pH值为弱碱性条件下的透盐率最低

We hope you pay more attention to jobs are as follows haven't been finished this week:(1) right and left side of upper water wall has been aligned and fixed;(2) Nine downcomers been pre-stored;(3) All the wall packing aligned and fixed, then install right and left side rigid beam;(4) Finishing welding counterpart of front wall packing;(5) Get two booster pump for turbine driven boiler feed water pump aligned and make inspection;(6) Electric Feed Water Pump Unit, Coupling and Motor Pump positioned;(7) Equipment in Start-up Boiler House aligned and make inspection;(8) Get three Reusing Water Pump aligned;(9) Equipment in Integrated Water Pump House aligned and make inspection.

本周，以下工作未完成，希望贵单位引起重视：（1）上水左右侧找正完，且加固完；（2）下降管9根预存完；（3）包墙全部找正完，加固完，之后安装左右侧刚性梁；（4）前包墙对口焊接完毕；（5）2台汽动前置泵找平找正，并验收；（6）电动给水泵组，耦合器和电泵就位；（7）启动锅炉房内设备找平找正，并验收；（8）3台复用水泵就位；（9）综合水泵房内设备找平找正，并验收。

In the design of the supercritical high pressure feed water heater,choose the two kinds of materials of WB36 and 15CrMo at the same time,the high pressure feed water heater must carry on the whole heat treatment,so the anneal temperature of WB36 must be raised above 600 ℃ to satisfy the request of the whole function of the high pressure feed water heater.

在超临界高压加热器的设计中，同时选用了WB36和15CrMo两种材料，由于高压加热器必须进行整体热处理，因此必须提高WB36焊接退火温度至600℃以上来满足高压加热器整体性能的要求。

It has important real signification to study the condition forecasting of feed water pump, advance the safety and reliability of operation of feed water pump and to develop condition maintenance to feed water pump.

开展给水泵状态预测的研究，提高给水泵运行的安全性、可靠性及状态维修，都具有重要的现实意义。

The system uses PID controller and fuzzy controller to design automatic control loops, a study of fuzzy three-element feed-water control system for a CFB municipal waste incinerator is introduced. The incinerator is faced with problems such as large-scale fluctuation of furnace heat load and low regulation resolution of main control feed-water valve. The fuzzy logic control system is applied to modulate PI control parameters according to steam drum water level to fit fluctuated heat load, the inner and outer control loops are realized in an asynchronous way to effectively decrease regulation time and improve regulation precision.

针对垃圾炉炉膛负荷波动较大，同时给水调节阀门执行机构的调节精度较低的现状，在传统三冲量串级汽包水位控制方式的基础上，采用模糊控制策略对内、外串级回路的PI控制参数进行分区域调整，强调了PI参数在被控参量处于不同范围时的分离作用，同时内、外控制回路采用异步控制方式，浙江大学硕士学位论文从而有效地减小了被控参量的调节时间，提高调节精度，使水位波动控制在△为士12~范围内。

Establishing on the foundation of the project of 'the monitoring state and maintenance assist support system of feed pump for 300MW unit, Shiheng Power Plant, Shandong', this paper's content comprise on-line monitoring and thermodynamic calculation on small steam turbine for feed water pump, and supply the necessary data for feed water pump's performance analysis, trouble analysis and small steam turbine's performance analysis, optimization, heat stress calculation and tremble monitoring.

本论文的内容是建立在&山东石横电厂给水泵状态监测与维修辅助支持系统&项目基础上，涉及大型机组锅炉给水泵驱动用小汽轮机进行在线监测和热力计算，为给水泵的性能分析、故障分析以及小汽轮机的性能分析和优化、热应力计算和震动监测提供必需的数据。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。