查询词典 boiler

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。

But it is difficult to find a perfect method to control drum boiler's corrosion. Now deoxidization water chemistry for drum boiler has the characteristics of high corrosion speed, high Fe content in feedwater and boiler water, high scaling speed, short chemical cleaning interval and needing poisonous chemical deoxidant, etc.

火力发电站由于大量使用金属材料，并且金属材料的使用环境大都接近其极限使用条件，因而常由腐蚀而引发事故，造成重大损失。

Consequently the diathermancy was strengthened, the effect of heat transfer was improved and the flow and combustion process in the boiler has become much better. First, in this thesis the burn characteristic of the rubbish and the process of combustion in the chain boiler has been studied. A series of mathematic model has been given. This thesis carefully introduced the principle and formula of the turbulent flow model、two-equation model、radiation model、dispersed phase model and standard wall function method. The software FLUENT has been applied to simulate the temperature、pressure、velocity and mass fraction of species in the boiler furnace and stokehole. The analysis and the comparison have been done. The calculation results indicate agreement with the fact and the studies both here and abroad.

首先，本文针对SZL10-1.25-MJ造纸垃圾焚烧锅炉，结合其燃料的特性，对垃圾的燃烧特性以及层燃炉中垃圾的焚烧过程进行分析；给出一套完整的垃圾锅炉炉内传热数学模型，并分别详细阐述了湍流流动模型、双方程模型、辐射传热模型、离散相模型及标准壁面函数的原理及计算公式；借助于Fluent软件平台对炉膛内的温度场、速度场、组分浓度场及炉膛出口的温度分布、速度分布、组分浓度分布等进行数值模拟，分别从定性和定量的角度与实际情况进行了比较，得到了较满意的结果；模拟结果与国内外的很多研究能较好符合。

Compared to where technology in espresso is going today - individual group-cap boilers for each group, dual boiler, dual PID, heat exchanger pre-heating the brew boiler water and mix-valve fine tuning individual on the fly grouphead temperature controls - the heat exchange boiler/brew system is possibly at the limit of its capabilities and risks being left behind by these newer technologies.

对比今天意式浓缩咖啡机技术的发展-独立冲泡锅炉系统对于每个冲煮头，双锅炉，双锅炉PID，热交换冲煮之前的预热水和混合阀微调在不同的冲煮头上进行温度控制-热交换锅炉/冲煮系统是在处理他们能力受到限制或者是减低风险的时候留下了这个继续解决的新技术。

This thesis is aimed to study the flow field in Circulating Fluidized Bed holier in cold state based on the system of Particle Image Velocimetry, Several parts are included: the distribution of particles velocity in CFB boiler including radial velocity and axial velocity of particles; the average radial and axial concentration distribution of particles in CFB boiler; the average radial and axial size distribution of particles in CFB boiler.

本文采用PIV系统对循环流化床锅炉冷态流场进行了试验研究，研究的主要内容包括：循环流化床冷态流场粒子的速度分布特性，包括粒子的径向速度和轴向速度分布；循环流化床颗粒的平均浓度沿径向和轴向分布特性；循环流化床颗粒平均粒径的轴向和径向分布特性。

On account of the fact that the signal of total boiler radiant energy fully embodies the changes of combustion conditions in a boiler and can foreshow the variation trend of inlet flue gas temperature , the signal of total boiler radiant energy is introduced in the control system for superheated steam temperature .

鉴于锅炉总辐射能信号充分体现了锅炉内燃烧工况的变化，能提前反映烟道进口烟温变化趋势，为此，在过热蒸汽温度控制系统中引入了锅炉总辐射能信号，通过检测烟气温度及其变化趋势来提前调节减温水量，从而改善主蒸汽温度调节的品质。

In this paper, the strength theory is adopted to analyze the stress of the pressure component of boiler, and the calculation method of metal fatigue and creep is adopted to estimate the life loss of the boiler. Meanwhile, the short-cut calculation method is put forward which can meet the requirement of on-line monitoring. On the basis of above, the on-line monitoring and management system of boiler life is developed.

本文采用强度理论和疲劳、蠕变寿命计算方法，分别对电站锅炉的炉外、炉内主要承压部件进行了应力分析和寿命计算，并提出满足在线监测要求的简化计算方法，在此基础上，开发了锅炉承压部件的寿命在线监测和管理系统。

First,the paper introduce the automation summarizer of marine boiler and the basic principle of PLC(SIEMENS PLC S7-200 of Germany). Following, the paper introduce a typical boiler system of shipping. On this base, the paper pay more attention to making control programme of S7-200 for oil auxiliary boiler.

文章首先介绍了船舶辅助锅炉自动控制的总体概述和可编程控制器（德国西门子可编程控制器S7-200）的基本工作原理，详细介绍了船舶燃油辅助锅炉的典型系统，在此基础上，着重对采用S7-200控制的燃油辅助锅炉进行了PLC编程，其中对蒸汽压力采用多位控制。

Facing boiler tubes life prediction in practice,the method about boiler tube life prediction with measuring thickness of oxidation layer in inter tube wall was introduced and advanced technology on boiler bube appearance valuation and life prediction both at home and abroad was recommended.

3针对工程实际中受热面管的的寿命预测问题，介绍了通过内壁氧化皮厚度的测量进行受热面管寿命预测的方法，推荐了国内外先进的炉受热面状态评估与寿命预测技术。

A new leak supervision over waste boiler is introduced. Waste heat boiler gas phase, i.e., content change of non condensable gas and dissolved gas is determined to judge the leak status of waste heat boiler.

介绍了一种废热锅炉漏点监控新方法：在生产系统不停车的情况下，通过测定废热锅炉气相即蒸汽中不凝性气体和溶解性气体的含量变化趋势来判定废热锅炉泄漏状况。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。