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第93章 改进方案,震惊的翟
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第93章 改进方案,震惊的翟工

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    烟囱是简称,专业术语是蒸汽机的乏汽喷口和送风气喷嘴,它是是烟箱通风系统的核心部件,其结构参数直接影响炉膛负压与燃烧效率。
    而据林言根据从图纸以及脑海中的记忆得知,目前1954年的烟囱设计依旧采用单孔直喷结构,喷口直径300mm、高度300mm,乏汽以80m/s速度垂直上排,依靠喷射引射作用形成烟箱负压。
    该结构虽简单可靠,但喷口截面积偏大导致蒸汽流速不足,抽力有限,严重限制了炉床通风强度与煤炭燃烧充分性。
    听到林言的话,翟工摸着下巴,沉吟道:“改烟囱吗?”
    此前他考虑的是高压动能,机械蒸汽能,材料性能等等,还真没考虑过这些方面,
    林言点点头,在脑海里用数据模型瞬间估算上百遍后,小脸正经地和对方探讨:“送风气喷嘴的直径和高度决定了乏汽排出时的速度和抽力,这不是不能动的东西。”
    我建议把喷口直径缩到220毫米左右,喷口高度从现在的300毫米加到800毫米左右,再让喷嘴中心线偏移三度,这样子应该比现在的还要好。“
    翟旭一愣:“还要偏移3度?“
    “对。“
    林言用手指在图纸上画了一道斜线,“乏汽斜着往上喷,能在烟箱里形成旋流,抽力更均匀,通风效率反而比直喷高。而且这个改动没什么技术难度,焊一个锥形套筒套上去就行了,都不用重做整个烟筒。“
    虽然翟工不清楚林言为什么像开挂般随口就能报出这样的精确数据,但在听到林言的构想并在脑海里验证其合理性后,二话不说拿过稿纸就开始算。
    笔尖刷刷地划着,公式一行一行列下来:
    【喷口面A69=π×(0.15)05=0.0707m05;改后D60=220mm,A60=π×(0.11)05=0.0380m05。假定蒸汽流量不变,速度与截面积成反比:v60/v69=A69/A60=0.0707/0.0380≈1.86。原喷气速度约80m/s,改进后149m/s......】
    翟工笔尖一顿,猛地抬起头:
    “将近一百五十米每秒?比原来快了将近一倍!”
    林言点头:“而且喷气速度上来了,烟箱里的负压也就跟着上来了,到时候抽力什么的数据都能跟上,到时候既能提速又能省煤。”
    翟旭立刻埋头继续算。
    烟箱负压来源于喷口抽力,与速度平方成正比:Δp=kv05/2,原本的烟箱负压大约100mm水柱。速度从80m/s提升到150m/s,速度平方之比为(15005(8005)=22500/6400≈3.52。假设效率系数不变:p2=100×3.52x0.44≈155mm。
    炉膛燃烧效率η69≈70%,
    改进后燃烧更充分,按经验曲线,抽力提升50%......
    “节煤将近百分之十五!”
    翟工激动的猛拍大腿,眸子里异彩连连。
    然而林言并没有就此停下建议,在对方计算的同时,心分多用的在脑海里构建数据模型,并报着自己算出的数据供对方检验:
    “还有爬坡的时候,因为喷口偏移三度,乏汽有了一个横向分速度,对蒸汽在烟箱里的扩散路径产生了改变,瞬间爬坡速度也会有变化,例如你算一下千分之二十坡道的情况。“
    翟工埋头又算了一页:
    机车牵引力与锅炉蒸发能力正相关,蒸发能力又受通风效率影响。原来在20%坡道上稳定速度约15km/h,改进后效率提升约12%,速度为......
    “快了将近两公里!“翟旭抬头,看着林言的眼神已经有点发直了。
    林言又把图纸往外拉了拉:“炉篦子间距也可以动一下。你们现在是十五毫米间距,调大到二十五毫米吧。间隙大了,灰渣落得快,通风阻力减少,炉床上的火层能烧得更透。”
    “还有气阀开度——现在满开100%吧?调到75%就够了,喷口缩径之后,乏汽流速已经上来了,不需要开那么大浪费蒸汽压力。喷口缩径、炉篦间距、气阀开度,这三个改装配在一起,你重新算一下。“
    翟旭深吸一口气,重新拿了一张白纸,把三个变量叠加进去:
    抽力提升:烟箱负压100→155mm水柱,增幅55%;
    燃烧效率提升:70%→85%,节煤约15%;
    气阀开度从100%降至75%,蒸汽利用率提高约8%;
    炉篦通风阻力下降,热交换效率再改善约5%......
    “综合马力提升将近五成?“翟旭话说到一半,又自己摇了摇头,
    “不对,有些是锅炉蒸发量的提升,轮周功率不能直接这么乘,还得打折扣。实际到车轮上——“
    他涂涂改改又算了半页纸,最终得出了一个相对保守的数字:
    “综合下来,马力能提升两成多,接近三成。节煤十五个点,爬坡提速将近两公里。一套焊上去的锥形套筒加上调间距、改开度——三个改动加起来,效果翻倍都不止。“
    更让翟旭惊喜的是林言提到的热应力变化。
    林言说喷口速度提升后,乏汽在烟箱内停留时间缩短,热交换趋于均匀,锅炉管板处的热冲击变小,温度波动范围从原来的正负80度降到了正负40度左右。翟旭在稿纸上推算了几个循环周期,确认这个判断大致合理,当即长吁一口气:
    “热应力减一半,锅炉寿命至少能多跑好几年,大修周期也能拉长。这比节煤还划算!“
    他放下笔,转过头来看林言的眼神,已经彻底变了——那是一种带着惊叹、痴迷、甚至有些虔诚的目光,像是考古学家突然挖出了一件稀世珍宝。他嘴唇动了动,声音有点发颤:
    “小林……你这脑袋是怎么长的?我干了二十多年的蒸汽机车,烟筒这事天天看在眼里,愣是没往这处想过。你才多大?看一眼图纸就全给我翻了个个儿!“
    林言被他看得有点不好意思,挠了挠头,眼里没多少得意:“翟工您别夸了,都是些小改动。“
    如果不是靠从系统商城里韩来的技术,他的真实能力可能还不如翟工,毕竟人家可是正儿八经的靠真才实意地钻研弄到各种首创啊。
    “小改动?“
    翟旭把稿纸往桌上一拍,
    “你管这叫小改动?抽力涨五成、煤省一成半、马力提两成多、热应力减一半——这叫小改动?我告诉你,要是按你这套改下来,全国几千台蒸汽机车都动一遍,每年光煤钱就能省下成千上万吨!“
    他越说越激动,站起身在屋里来回走了两圈,忽然停住脚步,目光灼灼地盯着林言:
    “小林,你来我这儿吧!机车厂副总工的位置我给你留着!不,总工也能谈!你要什么条件我都去跟上面争取!“哪怕你待遇是咱们全场最好的都没问题!”
    林言身后那群学生们,此刻已经彻底跟不上了。
    他们看着翟旭密密麻麻的稿纸,直接两眼放空,嘴唇微张,脸上的表情写满了“我是谁我在哪“的迷茫之情。
    翟旭带的那帮学生更惨。他们平日里跟着翟旭也算见过不少技术讨论,可今天这讨论速度的架势完全超出了他们的常规认知。
    几个年轻人挤在墙角,手里拿着笔记本却一个字都写不下去,他们手里刚记下两个公式,下一个就多出数道数据和公式,以及各种模型推演,让他们根本没有丝毫能承受的能力,眼神只剩阿巴阿巴的空洞和麻木。
    两伙人的目光在空中相遇,全是同病相怜的茫然,既尴尬又心酸。
    有人低头假装在翻资料,有人偷偷掐自己大腿保持清醒,试图继续参与大佬讨论的余波。
    可随即仅仅是再坚持数分钟的听课后,再次和其他同学们一起缩在角落里埋头自闭,脸上写满弱小可怜又无助。
    就这么一直到下午五点多,甚至天色都已经暗了下来,翟旭完全没有停下来的意思,拉着林言还要继续算第三版方案。
    最后还是铁道部那位赵司长闻讯赶来,看到这两人忘我的阵势,又好气又好笑:
    “小翟!你看看几点了!小林到现在一口饭没吃,你也早上就啃了半个馒头,你俩这是打算把命搭在图纸上?“
    翟旭这才回过神,看了看窗外灰蒙蒙的天色,又看了看林言略显疲惫的脸,顿时有些惭愧:“哎呀怪我怪我,一聊起来就忘了时辰。小林快快快,先去吃饭先去吃饭!“
    可他说着“去吃饭“,手却还攥着林言的袖子不撒开,趁端茶倒水的间隙又凑过来低声问:
    “小林,那个烟箱锥套角度要是再偏一度,会不会更合适?还有,新炉篦子的铸铁牌号有没有讲究?“
    林言笑着答了两句,翟旭听得连连点头,刚要追问第三句,赵司长已经黑着脸把两人隔开了。赵司长压低声音对翟旭说:“老翟,你别太过分啊,人刚下火车就被你拽来算了一下午,接风宴都没办,你这像话吗?“
    翟旭讪讪地松了手,可目光还是黏在林言身上舍不得移开,脸上还写满了各种稀罕和惊叹,就像是普通人看到好宝贝般,恨不得拖回家里占为己有并珍藏。
    这样的好宝贝,要是能把对方挖到自己部门的话,就算少活10年也值了呀!这辈子他们部门算是传承有望了呀!
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