"Chief, I have another question!"
In the laboratory, Mo Lingwei frowned and asked: "Since we need DC power so much, and light bulbs can only be lit with DC power, why didn't we just use a DC generator to generate electricity in the first place?"
Hearing Mo Lingwei ask this question, Li Zexuan couldn't help but secretly praise this girl for her extraordinary intelligence. He thought for a while and said: "Miss Mo, have you ever thought about this problem? If the hydropower station emits direct current, then it will How much voltage will be attenuated through a mile of wire?
You must know that the longer the length of wires of the same thickness, the higher the resistance, and the greater the partial voltage. Assuming that the output voltage of a hydropower station is 200 volts, and it is transmitted to a place one mile away, the voltage is likely to be only 150 volts. Voltage or so, farther away, the voltage will be lower!
The calibrated voltages of the lamps produced in our workshop are all the same. If DC power is used for transmission, places far away from the hydropower station will not be able to obtain enough voltage to light the lamps!
If AC power is used for transmission, this problem will not exist, because we have transformers. In places far away from hydropower stations, we can use transformers to boost the voltage to the value we need. Converting DC voltage is not as easy as AC voltage!
In addition, Miss Mo, you should also know that the internal structure of an alternator is simpler than that of a DC generator, and its lifespan is longer than that of a DC generator. Therefore, after considering many aspects, I chose the transmission of AC power. plan! "
In fact, the dispute between AC and DC, even in modern times, does not end with AC winning. As far as the power system of the 21st century is concerned, high-voltage power transmission is a situation where AC and DC coexist and complement each other. Even with the development of power electronics technology, DC power transmission may once again return to its dominant position, because DC power only requires Consider the loss caused by line resistance. During the transmission process of alternating current, impedance, inductive reactance, and capacitive reactance will cause losses to the transmitted power!
However, in terms of the current technical conditions of Datang, choosing alternating current for transmission is the most feasible and economical solution!
Mo Lingwei suddenly understood after hearing this. She nodded and said with admiration: "I didn't expect that there is such great knowledge in it. The mountain leader was really far-sighted when he built the hydropower station!"
Li Zexuan smiled, did not answer, but looked at Wang Ji and asked: "Mr. Wang, I believe the DC power supply problem will be solved in a few days, but I don't know if the various raw materials and equipment over there are ready. ?”
Wang Ji nodded and said: "Don't worry, Commander. Everything is ready, all we need is the east wind! The electrolytic tank, thick copper, and bile alum are all ready!"
Li Zexuan was surprised and said: "Oh? The progress is so fast? Then Mr. Wang, can the quantity of bile alum you have prepared be sufficient?"
After all, the amount of copper that the workshop will refine in the future will be quite large, so Li Zexuan must ask clearly in advance.
Wang Ji smiled and said: "Captain, please rest assured, this gall alum is not a rare thing. There is a mine in Lantian County that specifically produces gall alum, which is enough to supply our workshop with refined copper!"
When Li Zexuan heard this, he was surprised and said: "What? There is a gall alum mine in Lantian County? Why didn't I know?"
Wang Ji said strangely: "There has always been this gall alumite! But this thing only has some medicinal uses and is not very valuable. It is normal that you don't know about it, Mr. Hou!"
Bile vitriol, copper sulfate crystals, can also be used to make medicine. It can stimulate the gastric mucosa, cause the vomiting center to be excited and induce vomiting. It is used for wind and phlegm congestion, laryngeal paralysis, epilepsy, ingestion of poisonous substances, aphthous sores, dental malnutrition, rheumatoid arthritis, sores, gallbladder, swollen and poisonous swelling, etc.
Li Zexuan quickly interrupted: "Who said it's not valuable? This gall alum can be used to refine blister copper, and it can also use electricity to make electrolyte to electrolyze and refine copper. With this gall alum mine, we can use it to a great extent. Solving our current copper shortage dilemma!”
"Smelting copper from gall alum? How can copper be extracted from gall alum? Oh, by the way! This is indeed possible. Ge Xianweng mentioned in "Huang Bai" in "Baopuzi Neipian" that soaking iron sheets with gall alum solution can obtain copper. The method, in chemistry, this is called a displacement reaction! Hey! Why didn’t I think of this~?”
Wang Ji was confused at first, then patted his head and said annoyed.
The methods of refining copper can be roughly divided into two types - fire copper smelting and wet copper smelting. Among them, pyrometallurgical copper smelting involves contacting malachite with ignited charcoal to decompose it into copper oxide, and then reduce it to metallic copper. The equation is (OH)2+C==2Cu+2CO2+H2O!
This was also the main way to produce copper before the Song Dynasty in China!
Copper smelting by hydrometallurgy is also called the gall copper method, and its production process mainly includes two aspects. The first is copper immersion, which is to put the iron in a bile alum (CuSO4·5H2O) solution (commonly known as bile water), so that the copper ions in the bile alum are replaced by metals into elemental copper and deposited; the second is to collect the copper that is about to be replaced. The powder is collected and then smelted and cast.
The Chinese were the first to use natural copper compounds to smelt copper by hydrometallurgy. In the Western Han Dynasty, sulfuric acid was first used to react with copper oxide, and then iron was used to replace the copper. Liu An's "Huainan Wanbi Shu" "Zeng Qing gets iron and turns it into copper." "Zeng Qing" refers to soluble copper salts, that is, when copper salts meet iron, copper is formed.
There is also a record in Jin Gehong's "Baopuzi Neipian·Huangbai" that "Iron is painted with Zeng Qing, and the iron is as red as copper". During the Northern and Southern Dynasties, it was further realized that not only copper sulfate, but other soluble copper salts could also undergo displacement reactions with iron.
But these methods were just accidental discoveries by alchemists during the alchemy process, and were not actually used in production! It was not until the late Tang Dynasty and the Five Dynasties that the principle of water-based copper smelting began to be applied in production. It further developed in the Song Dynasty and became one of the important methods for mass production of copper.
In the early Tang Dynasty, very few people knew about wet copper smelting, let alone used it in actual production!
Seeing that Wang Ji had reacted, Li Zexuan nodded and said: "That's right! The gall alum used to smelt copper is the displacement reaction in chemistry! I will send people to find the mine you mentioned, Mr. Wang, and explore it as soon as possible. To determine the reserves of bile alum, we can then dig a bile tank around the mine, forge the iron into thin slices and place them in the tank, and immerse the iron sheets with bile water. The copper in the bile alum will adhere to the surface of the iron sheets.
Although it would be troublesome to forge the iron sheets into thin sheets, our workshop now has a hydraulic stamping machine, so this is no longer a trouble! In addition, forging iron into thin sheets can increase the surface area of iron, greatly shorten the replacement time, and increase the yield of copper. It is hoped that the copper produced by this mine can fully supply the consumption of laying wires in Lantian County! "
A while ago, he was worried about where to get some copper. Unexpectedly, there was a gall alum mine in his fiefdom. People of this era obviously did not realize the true purpose of the gall alum mine. Otherwise, This mine has been expropriated and exploited by the imperial court a long time ago, and it won’t wait until now!
When Wang Ji heard this, he couldn't help but sigh with longing: "If the reserves of alum in this mine are really amazing, we can cover the entire Lantian County with electric wires~! This kind of grand scene has never been seen in Wang's dreams. look forward to!"
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After leaving Mo Lingwei's laboratory, Li Zexuan immediately sent Liu Feng and Liu Yun to take people to inspect the gall alum mine. After that, he went to the edge of the Bahe River and looked at the progress of Zhang Hongsheng's armor manufacturing. Zhang Hongsheng asked Li Zexuan It is guaranteed that the first set of plate armor will be made the day after tomorrow at the latest. After the first set is made, the subsequent production speed will be faster and faster!
"Young Master, yesterday I had someone forge a batch of iron sheets of the same size and thickness with a hydraulic stamping machine. With these iron sheets, we can make the chains you mentioned before. I have arranged for craftsmen to assemble the chains. It is expected that tomorrow It can be completed! Now that you have the chain, Master, are you planning to build a second-generation chain-driven bicycle?"
Uncle Fu was also at the hydropower station. When he saw Li Zexuan coming to "inspect the work," he quickly walked over and said.
When Li Zexuan heard this, he felt happy and secretly thought that the backward and clumsy front-wheel drive bicycles could finally be eliminated. He smiled and said:
"Build it! Build it quickly! The sooner the better! Oh, by the way, Fu Bo, this bicycle is driven by a chain. Even if I don't give you the drawing, you can imagine its structure, right?"
Uncle Fu nodded and said: "Don't worry, young master. I know what I know. This second-generation bicycle is only different from the first-generation bicycle in its transmission method. The other parts are basically the same. This is not a problem for me!"
Li Zexuan said excitedly: "Haha! That's good! I'll just wait for the good news from Fu Bo! The previous bicycles created extremely generous profits for our workshop. Now we have mastered the technology of production chains to create more flexible, I believe that more people will like this brisk second-generation bicycle and be willing to spend money on it! In the near future, the bicycles produced by our Qiqige workshop will definitely be spread all over the country in the Tang Dynasty!"
Last year, because he didn't have a dam or a hydraulic stamping machine, he couldn't make a chain. He could only make an "ancient" bicycle with a pedal on the front wheel. This kind of bicycle was laborious to ride and easy to fall over. Li Zexuan just It felt fresh at first, but after riding it for a few days, he never rode it again. He is a modern person, and any bicycle he has ridden is ten thousand times easier to ride than that "ancient" bicycle!
But the "natives" of the Tang Dynasty like Cheng Yaojin didn't know that there were better bicycles in the world. They only knew that the bicycles produced by Qiquge Workshop were faster, more flexible and more convenient than horse-drawn carriages, so they I ride every day when I go out.
Now that there are chains, everything is different. Not only can Li Zexuan produce bicycles with chain-driven rear wheels, he also wants to build some mountain bikes with disc brake shifting functions, and he even wants to develop electric...
I believe this improved bicycle can not only replace the carriage, but even the horse!
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The second day.
The first thing Li Zexuan did after having breakfast was to go to the medical clinic. When Dr. Wang saw Li Zexuan coming, he quickly reported:
"Chief, this time our Datang United Medical Center has recruited a total of fifty-eight doctors with superb medical skills and high medical ethics. Among them, there are eight female doctors and fifty male doctors. Some of them are good at bone setting and treating bruises. For injuries, some are good at treating children’s diseases, and even more are good at acupuncture and massage. Anyway, the departments we were divided into before all have doctors who are competent!"
Li Zexuan nodded and said: "That's great! The medical center must operate normally as soon as possible and be fully open to the people of Lantian County. The prices of all medicinal materials and medical fees must be open and transparent, and the people must not be deceived!" In addition, the number of female doctors is still too small compared to male doctors. I have told you before that doctors do not distinguish between men and women. In the eyes of doctors, there should not be the concept of male and female. Don't treat others just because they are women. Look down on the other party’s medical skills. Ge Qingyue yesterday was a good example! We will need to recruit more female doctors in the future!”
Li Zexuan heard that in yesterday's interview and assessment, Ge Qingyue "smiled proudly" with double perfect scores. He didn't know how many people's eyes were shocked. Li Zexuan felt that Ge Qingyue could be used to teach women in the world who are interested in medicine. Be an example and tell the world that women can also study and practice medicine, and their medical skills will not be worse than men!
Dr. Wang cupped his hands and said: "Chief, after yesterday's interview and assessment, no one dares to look down on female doctors anymore. The reason why there are only eight female doctors is because there are too few female doctors who applied for the job! But today " Datang Daily published a notice that our United Medical Center can recruit female doctors. I believe that soon, there will be female doctors with superb medical skills coming to our medical center!"
Hearing this, Li Zexuan nodded and said: "That's good! If you have any difficulties in the medical center in the future, Dr. Wang, just tell County Magistrate He, or you can tell me. If you can help, the county government and I will definitely help." Help us with all your strength!”
"Yes! Chief Shan!"
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In the afternoon, Li Zexuan rode to the workshop again.
Because he got the news that Mo Lingwei's electric motor and the second-generation chain bicycle that Fu Bo was responsible for supervising were all ready!
"Chief Shan, this is an electric motor. As long as it is connected to a battery, the rotor inside can rotate rapidly!"
In the Qiquge Workshop, Mo Lingwei pointed at the "bump" of iron lumps on the ground and said.
Li Zexuan frowned and had to admit that the appearance of this motor was a bit ugly. The casing should have been directly cast. The surface was not polished, quenched, or painted. It was as ugly as it could be. Ugly, I just don’t know if this ugly thing can be used normally!
"Put it on and let me take a look!"
Li Zexuan said softly.
"Um!"
Mo Lingwei responded and quickly called Song Xiaosi next to her to move a lead-acid battery from Wang Ji.
Yan Shaoning has not come since he hurriedly returned home yesterday. Mo Lingwei has no one to call on, so she can only call on Song Xiaosi!
After the lead-acid battery was brought over, Mo Lingwei placed the motor upside down and asked Song Xiaosi to hold it steady. Then she went to connect the power supply herself. When the wires were connected to the positive and negative electrodes of the battery, there was a "woo~" sound and the motor It spun quickly!
"Successful! Successful! We have changed the power model of this era!"
Li Zexuan looked at the motor that was spinning wildly and said with emotion.
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