小资料

一九八三年华北重点钢铁企业高炉煤气、焦炉煤气放散情况企业名称高炉煤气放散率82年{1083年4 .16」:.55。91焦炉煤气放散率82年{1983年。·56…。·261。10 10。52‘.几一9自J.占10山。831。028一.75.一21首钢}包钢一太己,.目山涉44。41544。546。88!一l…一8。091。8510。257。88一n︺一no一‘万一一八口30。423。0013。9213。10 119。052。9914。8110。17)29。9560一00钢化.县一郸一德一庄治一台一汾 一,一家一.邯一承一石一长一邢一临。z卜.0卜。卜.。一。。。.。一卜,。.。。卜卜.0一,。。.。一。。。.。一。。。.。LT66·多。…     

风车之歌

(二一少}6一)丝}“ 是那风纠吹动‘...t...r...万.乎二..月,......1..里......卜‘.,直6纵*一业}卜平一二卜着我的翅膀,不停地3一的3一我卫一啊别一风一一少·1我·25一4情歌22一有你}“ 唱。i7我才}i 能诊~一一邑卜-一6}4- 发电,一、 1。一“21生命,想 ·2·的、6、7/3仿产5﹄里、2一一。|一非一.!6一类厂3一浮走卜.;一.斌 叱、.︸洲6一人7一才能将 厂一一—‘弓丝1“在空中实现。 产一一一一一、了一~--一纠几凤啊我l、旧沮姗·1给 O“川】了一‘卜一独1丝二誓一苏一。厂断熟飞里一牟,、:澳匕呈‘笋麟7一世互}B-一·}16一人间。驱动.1082…     

国际

7000多座城市参与"地球一小时"活动3月23日晚8时30分,中国各地的标志性建筑熄灯一小时,共同度过一年一度的绿色节日——地球一小时。今年各国的地球一小时都强调了用行动超越一小时的理念。地球一小时不再是象征性的熄灯一小时,更是一种从地方到全球的行动力量,推动各地的人们为环境做出积极的改变。     

何处青山不道场

修行今天是一个时髦的词,做什么都可以是修行,因为人间是道场,一荼一饭,一呼一吸,一期一会,都可以是一场漫长的修行,关键是,你有一颗修行的心。     

(火用)平衡及其在化工节能中的应用

一、问题的提出众所周知,能量不能创造,也不能消灭,只能从一种形式转变为另一种形式,从一种物质传递到另一种物质。能量在数量上是守恒的。这就是热力学第一定律,即能量守恒和转化定律,它是能量平衡的基础。     

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5装配工件时发现工件小5.。.,尺寸不合格指出废品率比较高的原因: 检验时,抽检的比例小。 裹零件制造工艺过程参数一”’…’一‘””厂}一”犷一{一『’『加’全一毓范盯 设备}夹具}刀具}测量工具Ise一瓦.石瓜喜二厂丁一厄二兀二二-厂几互仄奋- {}(}叨日绪沐沃},叨日Ul胜、刀之}戈上拍l翻‘—{—{—{-一-一}里兰卜里竺一阵丝一,半自动车床}弹簧夹头}魏黔洲}袅瞿翌:…1}8。{。.1;、、.一.‘.}:-.-一1一,丁厂岁方尸}:盯丫:丫、_{一__.:二_},.--一::一}抽检10%┌─────┬─┐ │群套一J │哥│┌───┼─────┤ ││匕习…│厂粉…     

循环流化床锅炉一次风机单台运行分析

300MW循环流化床(CFB)锅炉设计为两台一次风机同时运行,主要提供锅炉炉内床料的流化风。当运行中出现一台一次风机故障需要停运检修时,就只能维持一台一次风机运行,此时锅炉的运行安全性就明显降低。通过一次风机单独运行时与正常运行方式时的对比分析,介绍了一台一次风机运行时的注意事项和成功经验总结,为300MW CFB锅炉遇到此类情况时提供了很好的借鉴作用。     

国外已投产的转子发动机主要参数表

璐。的呼 O闪呻 xo匕9x寸NN工OON一O﹂曰。翌哪9一的︷。·。一。·。一一叫.。一,·。一,·﹄一,·八一,·︵一·一!卜。些对工一咐6O的对00的哪、璐。O0009 、O价招太樱谓党葬书O的叼国一叫应一里协侧弼苏啊 掩 短资 赶石 刁从,布二峪O甲F叫知O,、尹布下 沪、 叫 暄 ,.碑口闷‘翻,.嘴兰兰{兰攀摇l):之习戴兰落,敏雏狂称八岁裂串佗,划口鹅军普妮神粉发玲松四八甘.撰仁耸侣解八狠冬祷创岁喊咤维贯枷 口, 口刃火力x心二呢乙,‘口沪刁几O呢口..闷l乃亡门称国钊易甘甲..目如.一‘恤...,... XX O弓口‘J 口翎卜户切 弓01口口‘目-一~一-…     

一种监控风粉混合均匀性的好方法

我厂两台400t/h 煤粉锅炉,呈四角喷燃、切圆燃烧。每个角的喷燃器有8只喷嘴,其中三次风喷嘴一只,二次风喷嘴四只,一次风喷嘴三只。喷嘴排列位置为(自下而上):二、一、一、二、一、二、二、三。每个一次风喷嘴配有1台叶轮给粉机,由一次风将煤粉送至炉内各角进行燃烧。运行人员主要以一次风的风压和给粉机的转速作为燃烧调整的监控依据。为使同排火嘴有     

祁红—Ⅱ型省柴灶

为了充分地利用山区燃料资源,根据,山区木材加工后的废料一锯屑,结合烧柴、煤等情况,我们研制成功了一种一灶多用的祁红—Ⅱ型省柴灶。一、省柴灶性能特点:1、燃料适应性广。有一灶多用效     

湿压缩对压缩系统失速后瞬态响应的影响分析

建立了湿压缩系统的Moore-Greitzer模型,该模型可以用来分析湿压缩对压缩系统失速后瞬态响应的影响,模型仿真结果定性的描述了湿压缩对压缩系统不稳定工作特性的影响,结果显示：在一定条件下,湿压缩可以消除喘振和旋转失速,提高系统的运行稳定性,增强压气机、压缩系统和燃气轮机的性能。     

两级离心式压气机湿压缩实验台系统改进设计与实验研究

详细介绍了两级离心式压气机湿压缩实验台系统的改进设计,并在改进的实验台上进行湿压缩试验,测得了单级离心压气机等折合转速下干压缩和湿压缩的特征参数,得到特性线和耗功变化情况,揭示了湿压缩对压气机工作的影响。     

Numerical analysis of performance and emissions behavior of a bi-fuel engine with compressed natural gas enriched with hydrogen using variable compression ratio strategy

The increase in the compression ratio reduces the fuel consumption and improves the performance. These effects of compression ratio could be observed in all of the engines, such as compression or spark ignition engines. Moreover, due to the compression ratio constraint based on the knocking phenomenon in spark ignition engines, there will always be an optimal compression ratio, which is one of the most fundamental factors in engine design. The optimum compression ratio could be achieved depending on the type of fuel, but in the case of bi-fuel engines, since the nature of each fuel is different, the design must be relatively optimal for both fuels. In this work, by using the VCR (variable compression ratio) strategy, the bi-fuel EF7 engine performance, combustion, and emissions were investigated in different compression ratios when the engine uses gasoline or HCNG (hydrogen enriched compressed natural gas) as fuel. The results revealed that by changing the compression ratio from 11.05 (actual compression ratio of engine) to 11.80 in HCNG mode, an increase of 13% in power could be achieved. Also CO formation, at the compression ratio of 11.80, was slightly lower (7%) than the compression ratio of 11.05. In addition, by reducing the compression ratio from 11.05 to 10.50 in gasoline mode, there was a significant increase in emissions; that was 44% for the NO_x and 16% for the CO, which could be one of the limiting factors of the advance in spark timing. Moreover, due to the VCR strategy and the significant optimization of the compression ratio, the combinatory method of VCR – HCNG can be used as an effective method for the bi-fuel engines in order to improve the performance and reduce emissions.     

Validation of a fuel cell compression spring equivalent model using polarisation data

Fuel cell stack compression is a vital part of the manufacturing process, however limited research exists in predicting the optimal compression force to maximise fuel cell performance. This paper validates a spring equivalent model proposed in a previous publication which, when coupled with literature derived gas diffusion layer (GDL) optimal compression data, can predict the compression force required based on gas diffusion layer and gasket properties. The error between the model and the optimal performance of the stack is a maximum of 6.4%. This is a positive indication as to the model's validity. In addition, the compression homogeneity applied by the compression system to the flow field plate is measured to confirm the GDL is experiencing the predicted compression force. The impact of this research is a reduction in development time and cost as less empirical testing will be required to identify optimal fuel cell stack compression.     

湿蒸汽两相压缩过程工作特性理论研究

为了抑制高温进汽水蒸气压缩过程的温度升高，可以采用湿压缩方式，利用水滴升温显热和汽化潜热来降低压缩终了的排汽温度，改善压缩机工作性能。本文通过对两相湿压缩过程的分析，建立水蒸气基元容积两相湿压缩过程数学模型。根据所建立的模型，采用数值模拟的方法对螺杆压缩机压缩水蒸气过程进行了计算，并分析了湿蒸汽进汽千度及水滴微粒直径对排汽温度和压缩功率的影响。     

Development of Wavelet Image Compression Technique to Particle Image Velocimetry

IntroductionParticle Image Velocimetry (PIV) is a non-intrusiveflow visualization technique and is now firmly established as a powerful fluid dynandcs tool to measure flowvelocity in the area of fluid mechanics. Even moreimportant than this remarkably improved performance ofthe PIV technique, is its unique ability to captureinstantaneous full-field flow and thus to allow thequantitative detection of spahal stfuctllres in unsteadyflows, which is not possible with other experimentaltechniques…     

Performance optimization of transcritical CO2 cycle with parallel compression economization

Being a low critical temperature fluid, CO₂ transcritical system offers low COP for a given application. Parallel compression economization is one of the techniques to improve the COP for transcritical CO₂ cycle. An optimization study of transcritical CO₂ refrigeration cycle with parallel compression economization is presented in this paper. Further, performance comparisons of three different COP improvement techniques; parallel compression economization alone, parallel compression economization with recooler and multistage compression with flash gas bypass are also presented for chosen operating conditions. Results show that the parallel compression economization is more effective at lower evaporator temperature. The expression for optimum discharge pressure has been developed which offers useful guideline for optimal system design and operation. Study shows that the parallel compression with economizer is promising transcritical CO₂ cycle modifications over other studied cycle configurations. A maximum improvement of 47.3% in optimum COP is observed by employing parallel compression economization for the studied ranges.     

Effect of compression ratio and spark timing on the power performance and combustion characteristics of an HCNG engine

This paper investigates the effect of compression ratio and spark timing on the power performance and combustion characteristics of a hydrogen enriched compressed natural gas engine. The experimental data was conducted under variable compression ratios (i.e. 10:1, 11:1 and 12:1) by varying the spark ignition timing. The engine was kept running at a constant speed of 1200 rpm with a constant excess air ratio of 1.6 and a constant manifold absolute pressure of 50 kPa. It has been found from the results that the higher compression ratio, the higher the indicated thermal efficiency. Increase in compression ratio leads to higher brake torque and lower break specific fuel consumption. But the improvements are weakened between higher compression ratios. The peak pressure is higher with higher compression ratio. Faster heat release rates and lesser coefficient of variations of indicated mean effective pressure can also been observed at higher compression ratios.     

湿压缩过程的热力学指标及湿压缩燃机循环性能分析

给出了评价湿压缩过程完善性的热力学指标－湿压缩效率的定义,研究了压气机入口喷水湿压缩简单燃机循环的性能特点和规律,并与常规简单燃机循环进行了比较,结果表明湿压缩在提高燃机循环性能方面有很大潜力。     

压缩比对四行程内燃机性能的影响分析

通过分析压缩比在使用过程的变化趋势,以及压缩比与工作参数的关系,进而分析压缩比对四行程内燃机性能的影响。