Academician Que Duanlin was also stunned, "No, what is this thing so expensive?! Imported?"
He took a closer look and saw that the huge reduction workshop actually only had two reduction furnaces and a lot of open space. Obviously it is prepared for future expansion.
Zhang Huiguo pointed to the two reduction furnaces and sighed, "The reduction furnace plays a key role in the production of high-purity polysilicon, and its internal environment is extremely harsh.
Silicon During operation, the surface temperature of the rod can be as high as 1100C, and heat radiation occurs in all directions, causing the furnace body to heat up. At the same time, the gases in the furnace, such as trichlorosilane and hydrogen chloride, are also highly corrosive, posing severe challenges to the furnace wall materials. Stringent requirements.
At present, domestic technology cannot meet the level of foreign countries. If we use domestic products, we will not be able to pass the environmental impact assessment. It will be too polluting and wasteful.
This stove can only be imported. I asked, the cost is only a few million, Hans Cat will cost us 38 million.
And this material is very fragile and must be replaced basically every three years. Now the unit cost of polysilicon is very large. Part of the proportion is the depreciation caused by this thing."
Que Duanlin understood that Zhang Huiguo, who had always insisted on being independent, had no solution at all. This was a problem of basic materials.
Not to mention quartz glass, even ordinary glass is more expensive the thicker it is.
Thicker means that more materials and more complex processes are required during the production process, resulting in increased production costs.
The 5, 10, and 15 ultra-white tempered glass used to seal the balcony window at home. The 10-thick glass is twice as thick as the 5-thick glass, and the price of 15-thickness glass is four times that of 5-thickness glass.
As for the reduction furnace in front of us, the thickness of the quartz glass of the heat shield has reached an astonishing 90%, which is a technology that is currently completely unavailable in China.
There is no way to attack the fortress.
Some things are difficult to tackle at the application level, and some things require breakthroughs at the theoretical level.
90-thick quartz glass, at this time, domestic manufacturers can only shake their heads, it is unheard of.
And Emperor Yun over there rolled his eyes when he heard this.
90 thick is certainly unheard of.
Because it doesn’t exist at all!
In fact, it is three pieces of 30-meter-thick quartz glass bonded together through a special technique.
This technique is called craftsmanship.
It's just that fact that sounds a little insulting.
Just like in the 1980s, Sakura came to us to buy 30,000 tons of peanuts. We had to wait for the valuable glue-free fiberboard. Sakura directly used a machine to shell the peanuts in front of us, and then Producing fiberboard in situ allows us to pull back the general.
Those who are technologically backward deserve to be beaten, wronged, and insulted. This is what countless ancestors told future generations with their swollen faces.
Stop talking about a big country and small people. Without a big country, you can’t even be a people.
But at this time, Qing Yun was too lazy to expose Hans Cat's lies.
Because he wants to fundamentally replace quartz glass.
Qing Yun listened on the side and asked out of curiosity, "Since it is so expensive, why not change the material?"
He asked directly and simply, trying to be as simple as possible. His eyes were full of clarity, like a college student full of stupid curiosity about the world.
This question is indeed a bit silly, but the chairman is asking, and Zhang Huiguo is not impatient.
Since Qing Yun is Chen Yiquan’s new disciple, he means that no matter what others say, he must have something to do with scientific research, even if it is just a name for himself, he must understand it.
What’s more, this is a good opportunity to demonstrate professional knowledge and deepen the chairman’s understanding of the project.
He cleared his throat and began to explain in detail: “Mr. Maintain stability and performance in a sexual environment."
He pointed to the technical parameter table and continued: "You see, we require the density of the material to be between 0.95g and 1.35g per cubic centimeter. This is to ensure its stability at high temperatures.
The ash content must be controlled below 500pp. This is to prevent impurity reactions at high temperatures.
The thermal conductivity must be controlled at 5. -30 watts/meter to ensure effective heat transfer. As for the compressive strength, it needs to reach 50-200 MPa to withstand the pressure that may be generated in the furnace."
Zhang Huiguo paused. Then he emphasized: "But the most important thing is the three major indicators of the material's dimensional stability, corrosion resistance and high temperature resistance.
Dimensional stability is directly related to the thermal expansion coefficient, which is particularly important in high-temperature operations. Any mistakes may lead to equipment damage or production accidents.”
These are actually key data for improving the Siemens method.
Zhang Huiguo knows that the future colleagues next to him are good at theory but have no practical experience. After all, he is the only one who is responsible for the actual production of the improved Siemens method.
So he explained it very patiently and comprehensively, and in order to ensure that Qing Yun could understand it, he tried to make it as easy to understand as possible.
Qingyun was also patiently reviewing basic knowledge, and at the same time suppressed his urge to correct the flaws in Zhang Huiguo's words, and listened carefully to Zhang Huiguo's every word.
His eyes revealed all respect for his seniors.
Although as a reborn person, he clearly understands the future development direction of science and technology and knows the limitations and room for improvement of many existing technologies, he understands better that without the diligent exploration of the older generation of scientific researchers like Zhang Huiguo, and accumulated practice, there would be no “future” as he knew.
The road to scientific research is never smooth sailing, and every bit of progress is the result of standing on the shoulders of those who came before us.
Just like Einstein’s theory of relativity, without Newton’s classical mechanics as the basis,Perhaps it is still just a fantasy of philosophers.
Every small step in scientific research is the result of the unremitting efforts of countless scientific researchers. Their work may seem insignificant at the time, but it paved the way for those who came after.
Otherwise, throw Einstein back to the Stone Age, and he will just starve to death because there will be no use for him.
As a reborn person, he actually wanted to tell the former leader in the polysilicon field in front of him how brilliant the future was.
After Zhang Huiguo finished explaining, he pondered for a moment, pretended to think about it, and continued to ask questions,
"Mr. Zhang, since the material is required to withstand high temperatures and reduce intergranular corrosion, And to reduce costs, why not replace it with much lower-cost low-carbon stainless steel?
Quartz glass may crystallize at ultra-high temperatures and affect its performance. ”
Zhang Huiguo et al. Hearing this, something strange arose in my heart.
They suddenly realized that the young chairman in front of them was the top scorer in this year's national college entrance examination at the epic level of difficulty. It was said that he had perfect scores in all three subjects of mathematics, physics and chemistry.
Although the question raised by Qing Yun is still a little bit silly, they feel that this way of transforming thinking is much better than many undergraduates in this major.
This is an essential quality for scientific researchers.
After Qing Yun raised a question about material substitution, Zhang Huiguo explained in detail the differences in physical properties between currently used quartz glass and low-carbon stainless steel.
He pointed out that although low-carbon stainless steel has advantages in some aspects, its durability and stability at high temperatures are still insufficient compared with quartz glass.
Zhang Huiguo explained, "Chairman, you are right. In terms of material properties, low-carbon stainless steel does have the possibility to replace quartz glass, but there is a problem with low-carbon stainless steel. It cannot be used for a long time, and How to ensure thermal stability?
The most important point is that the maximum heat-resistant temperature of quartz glass is 1500c, and the safe heat-resistant temperature is 1200c, which meets the requirements of 1050c and above for polysilicon production.
As for low-carbon stainless steel, such as 304l stainless steel, the general use temperature range is -196°c to 800°c. The mechanical strength of 310s stainless steel decreases after exceeding 800c. Although the heat-resistant temperature of 317l stainless steel can reach 1500c, its creep strength As a result, its expansion coefficient did not meet the standard."
Qing Yun listened carefully to Zhang Huiguo's explanation. He nodded to express his understanding, but then raised a new question,
"Mr. Zhang. , you have been emphasizing the high limit of heat resistance temperature. Can I draw the conclusion that the higher the temperature of the reduction furnace, the faster the chemical reaction rate and the higher the output?
If the conclusion is true? , my question is, why is it constant 1100c instead of 1150c?
My idea is that if the temperature is variable, and the product efficiency changes accordingly,So why don't we look for a new type of material instead? ”
This question made Zhang Huiguo a little stunned. This chairman...
Is he such a monster?!
All the big guys looked at him.
This is...
Mastering concepts - generating questions - deriving arguments - generating experiments to verify ideas?
At this time, Zhang Huiguo was digging. He twitched his brows, pondered for a moment, and then answered frankly, "Mr. Xiaoqing, regarding this issue, we have indeed not conducted in-depth experimental research before, nor have we conducted verification experiments.
We have always controlled the furnace temperature in accordance with traditional operating standards. The temperature of the reduction furnace is controlled at 1100 degrees.
As for why it is this temperature, it is because when I was inspecting Hans Cat’s house, I secretly saw others controlling it like this.
Your question... I think that the heat-resistant safety limit of quartz glass is 1200°, and Hans Cat is controlled at 1100°, so it is very likely that the conclusion is not that the higher the temperature, the better, so it is very possible Quartz glass is sufficient. ”
When everyone heard this, they didn’t accuse Zhang Huiguo of being too imprecise.
Because this is the norm in the country’s primary stage.
This is There is nothing to be embarrassed about, because many domestic industries do this.
When carrying out restoration projects, many things are known but not understood.
To put it mildly, we do not know why. , it's called crossing the river by feeling for the stones.
The main purpose is to solve the problem of "can it be built" first.
As for how it came about, it doesn't matter. Let’s leave it blank.
The next step is to solve the problem of improvement and make magic modifications, just like the replacement method of computer troubleshooting accessories. If you keep replacing them, you will naturally understand why it is.
So the big guys had no objection to what Zhang Huiguo said
What they were more interested in was the young entrepreneur in front of them who kept asking questions.
< p>Innate scientific research on the holy body?......
(End of this chapter) The transcoding has been serious recently, which makes us more motivated and updates faster. Please use your little hands to quit reading. Pattern.Thank you