Yue Yunhe also looked at the two of them again and said with Yan Xiao: "The Ministry of Electricity has the intention to select these two young comrades. After all, our age is here. Whether it is thinking and the technology in our minds, it is relatively traditional and old. Letting the young comrades discuss and discuss with new thinking and new angles is beneficial or not."

No one responded anymore. Yue Yunhe was a bit self-deprecating. In the eyes of most people, what power technology has always been for hard, stable, not new. Besides, most experts have not retired and have not been out of business. How could they be technically behind these two young people?

Yue Yunhe didn't say anything more and started the issue.

"After the first nine discussions and research results, based on the 175-meter water storage level plan, the conclusions of this group are as follows. I will read out the last item one by one, point by point. After each item is read out, the final statement and discussion will be conducted, and the argumentation report will be finalized."

The water storage level design of Sanxi Dam is the basis for all subsequent research and demonstration. After decades of discussion, the 175-meter water storage level design plan finally stood out.

A seemingly simple number of 175 meters is actually the result of a comprehensive study on geology, environment, hydrology, power generation technology, etc., which can be explained clearly without a few words. As Zhang Yifu, he only needs to know the simplest truth. The lower the water storage level, the lower the water storage capacity, the smaller the actual effect of the dam, the smaller the impact on the environment, and the smaller the power generation.

vice versa.

In fact, many people oppose 175 meters. This is a height that has been reached after working hard for a long time. Of course, it can be higher, but that is a higher challenge to technology and will have a greater impact on the Yangtze River. No one can afford to play.

Why Mr. Yue said that the technology of power generation should be based on this 175. The reason is also very simple. According to the physics of middle school, p=pgh. It is translated as the pressure inside the liquid increases with the increase of depth. Therefore, the higher the water storage level, the deeper the head of the turbine generator can be, and the greater the pressure pressure can be used to push the impeller.

To put it this way, the principle of a hydropower generator set is actually much simpler than a thermal generator set. The boiler turbine and water-vapor pipeline are no longer needed. The water flow directly drives the rotor to rotate and cuts the magnetic inductive line to generate electricity. While saving the heat part, it also saves tens of millions of tons of oil and coal.

Of course, the relationship between water storage level and power generation is a bit superficial. A little more scientific, the term "water head" is introduced to measure all this. Water head refers to the mechanical energy of a liquid per unit weight, which is somewhat similar to the potential energy. It can be said that the higher the water storage level and the higher the water head, the greater the potential energy, the more work it does, and therefore the power generation is greater. The concept of "maximum water head" should be used in engineering design. Because at different times of the year, especially during the dry period and flood season, the difference in water heads is relatively large.

According to the information held by Zhang Yifu, experts have already made this part of the calculation.

Assume that the water storage levels are 156 meters and 175 meters, respectively.

Then their largest heads are 93 meters and 112 meters respectively.

The final average annual power generation is 70 billion kWh and 85 billion kWh.

A brief look at the difference in water storage level of 19 meters represents a difference of 15 billion kWh of electricity per year, which is approximately equivalent to 4 to 5 Hebei power plants, or tens of thousands of Wentianming.

However, according to what Zhang Yifu knows, the highest annual power generation in Sanxi is almost 100 billion kWh in more than 20 years, which is more Wen Tianming...

No matter what, Zhang Yifu has already lost so much in order to understand the first sentence Yue Yunhe said. What should Xia Xue do?

Looking at Xia Xue, she was calm and did not even look at the report in her hand.

"Do you make sure you understand?" Zhang Yifu asked in a low voice. "Do you want me to tell you?"

Xia Xue looked at Zhang Yifu disdainfully: "Do you know why I applied for the electricity major?"

"Um?"

"Because of the water conservancy book, I was already broken when I was in high school." Xia Xue's expression revealed a sense of freehand painting like a lonely madman.

“…”

The cold air that I haven't felt for a long time blows gently again. If you spend all your spare time on reading... this person should not be too scary.

After Yue Yunhe simply scanned everyone, he began to read it one by one.

"We start with the hydraulic turbine generator set. The first point is the choice of the type of turbine. According to the water head change range of 61-112 meters, mixed flow or inclined flow turbines can be selected. Considering that the hybrid flow type is simple in structure, mature technology, widely used at home and abroad, and has rich design, manufacturing and operation experience, all the turbines above 500,000 kilowatts produced abroad are mixed flow types, and inclined flow types are... Therefore, Sanxi Power Station should use mixed flow turbines."

After saying that, Yue Yunhe looked up and said, "Today we need to confirm the final report. If you have any opinions, you can submit it immediately, including the two young comrades. After the discussion is over, they will have to sign the plan. It will be meaningless to argue again."

Zou Shiliang smiled and said, "Mixed streaming is definitely the only option, there is no controversy."

"Yes, this was confirmed in the third meeting."

"The inclined flow type is only used in small units, how can it be used in Sanxi?"

Amid the laughter, Zhang Yifu also asked Xia Xue in a low voice: "What's the difference between these two?"

"What big-tailed wolf are you pretending to be?"

"No, I really don't know."

"It is to make the structure very complicated and improve efficiency. The large unit dare not use it. If you explain it in detail, you will draw a picture for you. Let's talk about it later when you go back."

"So that's it..." Zhang Yifu was really convinced. He understood this unpopular professional knowledge so well.

After confirming that there was no objection to this, Yue Yunhe continued the meeting process.

"The second small point in the turbine part is that there are some small differences in the capacity of the unit. Most of us think that 700,000 kilowatts is more appropriate, while a small number of people think that 800,000 or 600,000, while a very small number of comrades insist on 500,000. This is one of the two core issues discussed in this meeting. I hope to determine a conclusion."

Yue Yunhe said, looking at Lao Zou next to him: "Shiliang, you can speak on behalf of 700,000 first."

"Well." Zou Shiliang took the information in his hand and said to the surroundings, "According to the spirit of the central government and the water resources of our Sanxi, this power station must be the world's number one hydropower station, and the unit capacity must also meet this standard. From foreign experience, 500,000-700,000 units are the mainstream of large power stations, and some have been put into production and running smoothly for 10 years. Take the world's largest Itap Hydropower Station for example. In the past decade, 700,000 units have been put into production. This is the best combination of the gold rated power, technology, efficiency and economy of advanced hydropower units. We have no reason to oppose it."

"Is that true?" Zhang Yifu asked Xia Xue in a low voice.

"It's certain, Sanxi's unit is at least 700,000 yuan." Xia Xue nodded, "No matter how high a single machine is, it's useless. On the one hand, the water head will be wasted, and on the other hand, the technical difficulty and cost will increase sharply. It's better to go directly to two units with 700,000 yuan."

"You understand very much."

"These information is on my dad's desk every day..."

Shortly after Lao Zou finished speaking, another younger expert spoke: "Dear leaders and experts, I did support 800,000 before this. The reason is very simple. After all, it is Sanxi, and the goal is the world's largest power station. I think it should be more first, and 800,000 units are undoubtedly more efficient. Specifically, assuming that our Sanxi target installed capacity is 20 million kilowatts, and 29 units are needed to use 700,000 units, and 800,000 units are needed, it only needs 25 units. All of you here are power experts, but you should pay attention to the fundamental difference between hydropower and thermal power. Adding a unit to thermal power is nothing more than the expansion of the power plant in the area, while hydropower requires a brand new water inlet on the dam, which has a considerable impact on the entire dam. The number and density of our water inlets will affect the stability of the dam. The smaller the better. Therefore, I only supported 800,000 units for the future expansion of Sanxi."

"Before expanding capacity, we must first consider stability." A person on the other side quickly retorted, "It is the first time anyone has done a project like Sanxi. You must be down-to-earth and avoid being too ambitious. We can first ensure that 700,000 is stable operation, and then consider what you said 800,000."

"Yes, you're right." The young expert nodded immediately, "Later, I also did some research in private. There are indeed rare precedents in the international market. If you use it at the beginning, there are still certain potential risks. We must first be stable before we can consider these issues. Therefore, I no longer insist on 800,000 and agree to a single-machine capacity plan of 700,000."

People around him nodded and finally got one. It seemed that 700,000 yuan was already a foregone conclusion.

At this moment, an old lady's voice came...

"You always talk about international and foreign. Have you ever considered the importance of the Sanxi Project?"

It was only then that Zhang Yifu noticed that there was such an old female expert in the venue!

The old lady was covered in white hair and neatly carried her head, and she also had a pair of thick black plastic eyes and a dark blue top. No matter how she looked, she was a pretty old-fashioned and terrifying existence.

No one spoke, and everyone's expressions were quite awkward.

After looking around, the old lady continued, "I know that many people think that the unit of 500,000 is too small and too backward, but seeking truth from facts, this is the unit that we have the ability to produce domestically. The Yangtze River is the lifeblood of the country, and the Sanxi is the throat. How can the United States and Germany get involved here? I think everything in the Sanxi project must be absolutely domestic. 500,000 domestically produced units are the only choice. Of course, with the advancement of technology, we can develop units of 600,000 or 700,000, and it will be fine if we go on at that time."

After the sensational old lady's voice fell, no one rushed to refute it. It was all embarrassing. Some people coughed twice, and some people scratched their heads.
Chapter completed!