freenovelworld Chapter 677 System Incompatibility? We'd Considered It Before!
Chapter 677 System Incompatibility? We'd Considered It Before!
"Forget the navy! Pick up my master!"
Jiang Xia didn't even look up, waving his hand irritably, "No wonder I was so anxious after giving out all the key points, like I had a rabbit in my hand!"
"Ah... I thought you figured out why that strange ship looks like that..." Old Wang was taken aback, lowered his head somewhat embarrassedly, and quickly spoke politely into the microphone, asking the operator to switch the communication target back to Li Changfu.
“What’s so hard to guess?” Jiang Xia was still buried in the pile of papers, his pen flying across the paper, leaving behind a string of complex data and symbols. Without looking up, he tossed out a sentence, “That thing is just a hydrofoil design. It wants to run fast but is afraid of wobbling… Brother Liu, quick! Open up Big Yellow’s scientific computing interface and help me calculate these parameters!”
Secretary Liu took it and immediately looked distressed.
Superheated steam: p=f(P,T), saturated steam: p=1/vg. The calculated steam density is approximately 38.5 kg/m3.
Calculation of cross-sectional abrupt change loss:
1. Sudden increase in losses:
Δh=(1?A1/A2)^2*c1^2/2 (J/kg)，其中A1为小截面，A2为大截面，C1为小截面处流速。
2. Suddenly reduce the loss
Δh=K?c2^2/2g, K≈0.5(1?A2/A1), 设A1为0.0491m^2，则Δh=？
So, the actual flow velocity c = m/p? In A = ?
This... this, just kill me!
Secretary Liu felt dizzy. He stiffly extended two fingers and began to perform "two-finger Zen" on the calculation interface of the Big Yellow clone, struggling to find symbols that matched the scribbles on Jiangxia's manuscript.
your sister!
We found the 'h', but what does the triangle symbol in front of it represent?
How did these two symbols end up together?
We found the 'm' too, but why is there a dot on top of its head? What does that mean?!
He glanced back at Jiang Xia pitifully, his eyes filled with a plea for help. But seeing Jiang Xia intently writing something rapidly on a new blueprint, his brow furrowed, clearly absorbed in thinking about another crucial issue, he didn't dare to make a sound to disturb him.
Left with no other choice, Secretary Liu could only resign herself to bending down, opening the small compartment under the computer console, and pulling out the brand-new "Computer Operation Guide" to begin her painful last-minute cramming.
As soon as the call connected, Jiang Xia rushed to the receiver: "Master! Master!"
"Comrade Xiao Jiang, your mentor is having a site meeting with several equipment team leaders. Is there anything important? Can I pass it on for you?" A strange male voice came from the other end of the phone.
Will you relay this message?
Jiang Xia pulled himself out of the formula and considered asking about the other party's identity. But then he thought, what's the point of asking? The person who answered the call must be of a high enough rank to be qualified.
"System! System problem... Hey! We've been focusing on the equipment itself all along, and we seem to have forgotten about this!"
Without bothering to ask who the other person was, he blurted out all the worries that Lao Wang had inadvertently pointed out: "Although I'm not very familiar with the power plant's equipment, our power plant's pipeline design, manufacturing, and installation standards are basically based on the Soviet GOST standard! That steam turbine probably uses the NF standard. Piping standards are not uniform, so you absolutely must not force a parallel connection!"
After he finished speaking, he felt a little relieved of the pressure in his heart. He quickly waved to Secretary Liu to see if the formulas he had just used had been calculated.
There's no data to speak of; we haven't even finished typing the first formula yet.
Secretary Liu kept her head bowed very low...
"Yes, Comrade Xiao Jiang, we are currently using the Alliance's 'small outer diameter series' (metric pipes)," while France uses the 'large outer diameter series' (imperial pipes). Currently, the measured inner diameter of a DN250 pipe in China is 249mm, while in France it is 251mm, a difference of 1.6% in cross-sectional area!"
Just as Jiang Xia was struggling with the calculation results, the person on the other end of the phone gently uttered a string of data.
This surprised him. The other party not only instantly understood his concerns but also provided precise data!
The other person continued speaking, as if recounting a familiar story:
"Meanwhile, we use a flat surface seal (FF) and a 30° bolt hole distribution, while the French use a raised-concave surface seal (MFM) and a 22.5° non-standard bolt hole angle..."
"Another point is that our main pipeline material is 20 carbon steel, with a temperature resistance limit of 540°C. The design steam parameters for the French steam turbine are 565°C/16.6MPa, and our pipelines may experience creep rupture during long-term operation..."
"In addition, our current boiler's maximum pressure is only 12.7 MPa, while the French steam turbine is designed for a pressure of 16.6 MPa. The decrease in steam enthalpy has led to a power output reduction of more than 30%..."
The other party seems to have considered the issue extremely thoroughly!
This series of readily available and incredibly precise data and analyses left Jiang Xia completely stunned. Just who was this gentle-voiced comrade?
It not only instantly pointed out the differences in pipe standards, but also took into account deep-seated and systemic issues such as material temperature resistance limits and boiler output bottlenecks in such a comprehensive way!
In comparison, Jiang Xia's worries just now seemed like something a primary school student would say, a bit like... showing off one's limited knowledge before an expert.
"Teacher, what is your surname?" A feeling of sincere respect welled up in Jiang Xia, and she subconsciously lowered her voice, speaking with a touch of caution.
"Haha, don't mention the price, you're being too polite. Just call me Comrade Changnian..."
Who is this? Jiang Xia was impressed but didn't know. However, there are too many experts these days, so it's only right to be respectful.
Jiang Xia wanted to say a few more modest words, but Comrade Changnian spoke first: "I talked to my good-for-nothing younger brother at home a couple of days ago, and he also praised you to the skies. After today's exchange, I can see for myself. Without seeing the actual objects on site, and relying solely on logical deduction, you were able to keenly grasp the most core and most easily overlooked fatal flaw of 'system incompatibility'. This insight... truly amazes me, Comrade Jiang."
"Hey, I'm just showing off my limited skills... It's like a blind cat stumbling upon a dead mouse, I'm just saying whatever comes to mind. You and the experienced masters here are truly amazing, you've got all the key points covered in one go!" Jiang Xia laughed self-deprecatingly, but he was genuinely impressed.
That's for sure. They know every detail, from the sealing method of the flange interface to the bolt angle and the temperature limit of the material. They've considered everything meticulously. My previous discovery really did seem like an overreaction.
“Since you’ve considered everything so thoroughly, I won’t bother you any longer. Well then…” Jiang Xia felt the issue was basically clear and prepared to end the call.
"and many more!"
"Huh? Is there anything else?"
A warm laugh came from the other end of the phone: "Hehe, Xiao Jiang, I have a question. To adapt to the parameters, compensate for the difference in flow area, and reduce the dependence on the existing boiler, we are considering adding guide cones at the diameter changes in the piping system, and changing the original single DN250 main steam pipe to two DN200 pipes running in parallel. We want to use this method to increase the total flow cross-sectional area and ensure the steam flow rate. What do you think of this process improvement plan?"
Jiang Xia, holding the microphone, froze for a moment, only one thought popping into her mind:
Another underhanded trick!
Yes! This is absolutely a wicked trick! By inserting a guide cone at the bend in the pipe and replacing a thick pipe with two thin pipes connected in parallel, they try to bypass the problems of standard mismatch and insufficient boiler output, so as to ensure that the steam can "feed" that French steam turbine. This is essentially a compromise solution that sacrifices efficiency for safety and feasibility!
It's a complete waste of resources, squandering the performance potential of that excellent steam turbine!
Following the other person's line of thought, Jiang Xia scribbled a few more notes on his notebook, wrote down a series of formulas, and handed them to Secretary Liu.
While waiting for the numerical results, we also considered the feasibility of this plan.
Hmm... this plan seems familiar...
However, Jiang Xia also had to admit that this "evil trick" contained the shadow of a "surprise trick"! Adding a well-designed guide cone at the bend and diameter change of the pipe can indeed effectively guide the airflow and reduce the vortex loss caused by airflow separation. This is a good idea in itself to reduce local resistance.
But why does Jiang Xia still feel that something is "evil"?
The problem lies in the design difficulty of that guide cone! It's not as simple as just stuffing a cone into a pipe and calling it a day!
Ah... If the cone angle is too large, the airflow will still separate on the surface of the cone and generate strong vortices, but the local drag coefficient (ξd value) can soar to over 0.6, and all the energy is wasted on spinning!
Insufficient cone length? If it doesn't cover the entire variable diameter area, the airflow will "go wild" at the edge of the cone, causing edge flow separation and triggering terrible duct vibration!
How terrifying is this vibration? Have you ever seen a kilometer-long pipe dancing?
Jiang Xia had seen a five-kilometer-long tailings transport pipe that, due to a similar vibration problem, caused the entire pipeline to twist wildly in the air as if it had been given life, twisting more gracefully than a green snake that had cultivated for eight hundred years!
Finally, the section of pipeline at the epicenter of the vibration was flung ten meters into the air. The entire pipeline broke into pieces...
In addition, pipe center offset is also a troublesome issue. If the centerline of the guide cone is offset from the centerline of the pipe by more than 3% of the pipe diameter, wow, the energy loss (head loss) of the original design will jump by at least 50%!
This is just a conservative estimate!
To propose such an unconventional improvement plan that balances ingenious ideas with enormous technical risks... Comrade Changnian, or rather his technical team, is definitely not an ordinary person who follows the rules! They are absolutely bold, experienced, and even a bit "crazy" technical experts!
However, the more Jiang Xia thought about this plan, the more familiar it seemed.
How similar this is to a little story I told my mentor over drinks in my later years, about the author of a method for calculating the stability of power systems...
Jiang Xia cautiously continued, "Is your surname Cai...?"
"Yes!"
"Did you work at the Shijingshan Power Plant?"
"Hahaha, that old bastard Li Changfu has cursed me quite a bit, hasn't he..."
"Did your younger brother write a book on information theory?"
"Yes!"
The case is solved! It was you! Wait a minute, let me have the guy studying power dispatch kowtow to you...
By the way, have the student from the University of Posts and Telecommunications kowtow to your brother.