"Mountain chief, I still have a question!"

In the laboratory, Mo Lingwei frowned and asked, "Since we need direct current so much, and the light bulb can only be lit with direct current, why didn't we directly use a DC generator to generate electricity?" ”

Hearing Mo Lingwei ask this question, Li Zexuan couldn't help but secretly praise this girl for being smart, he thought for a while and said: "Miss Mo, have you ever thought about this question, if the hydropower station generates direct current, then how much voltage will it attenuate after a mile-long wire?"

You know, the longer the length of the same thickness of the wire, the higher the resistance, the greater the partial voltage, assuming that the output voltage of the hydropower station is 200 volts, transmitted to a place a mile away, the voltage is likely to be only about 150 volts, farther away, the voltage will be lower!

The calibrated voltage of the lamps produced in our workshop is the same, and if direct current is used for transmission, it will not be possible to obtain enough voltage to light the lamps far away from the hydropower station!

If we use alternating current for transmission, we don't have this problem, because we have transformers, and at a distance from the hydropower station, we can use the transformer to boost the voltage to the value we need. And DC voltage is not as easy to convert as AC power!

In addition, Miss Mo, you should also know that the internal structure of the alternator is simpler than that of the DC generator, and the life span is longer than that of the DC generator, so after considering many aspects, I chose the transmission scheme of alternating current! ”

In fact, the controversy over alternating current, even in modern times, does not end with the victory of alternating current. As far as the power system of the 21st century is concerned, high-voltage transmission is the coexistence of alternating and straight, complementing each other, and even, with the development of power electronics technology, DC transmission may return to the dominant position again, because the direct current only needs to consider the loss caused by the line resistance in the transmission process, and the alternating current in the transmission process, impedance, inductive reactance, capacitive reactance will produce losses on the transmitted power!

However, as far as the current technical conditions of Datang are concerned, choosing alternating current for transmission is the most feasible and economical solution!

Mo Lingwei suddenly realized when she heard this, she nodded, and said with admiration: "I didn't expect that there is such a big knowledge here, when the mountain chief built the hydropower station, it was really far-sighted!" ”

Li Zexuan smiled, did not answer, but looked at Wang Ji and asked: "Mr. Wang, I believe that the problem of DC power supply can be solved in a few days, but I don't know if all kinds of raw materials and equipment can be prepared over there?" ”

Wang Ji nodded and said: "Don't worry, the old man's side is ready for everything, and he only owes the east wind!" The electrolyzer, blister copper, gallium are all ready! ”

Li Zexuan was surprised: "Oh? Progress so fast? Mr. Wang, is there enough bile alum you have prepared? ”

After all, the amount of copper that the workshop will refine in the future is also a lot, and Li Zexuan must ask in advance.

Wang Ji said with a smile: "Mountain Chief, you can rest assured, this gallium is not a rare thing, there is a mine in Lantian County that specializes in producing gallalum, which is completely enough to supply our workshop to refine copper!" ”

When Li Zexuan heard this, he was pleasantly surprised: "What? Is there a ball mine in Lantian County? How did I not know? ”

Wang Ji said strangely: "This ball mine has always been there!" However, this thing is only used for medicine, and it is not very valuable, so it is normal for you not to know, Master Hou! ”

Cholelum, that is, copper sulfate crystals, can also be used as medicine, it can stimulate the gastric mucosa, cause vomiting center excitement and induce vomiting. It is used for wind phlegm congestion, throat paralysis, epilepsy, accidental ingestion of poisons, mouth sores, tooth chancre, red eye rot, sores, gium, swelling and poison, etc.

Li Zexuan hurriedly interrupted: "Who said it's worthless?" This bileum can be used to refine blister copper, and can use electricity as an electrolyte to electrolyze and refine copper. ”

"Bile-alum smelting copper? How can copper be refined in gall alum? Oh yes! This is indeed possible, Ge Xianweng mentioned in "Hug Puzi Inner Chapter: Huang Bai" that the method of soaking iron sheets with bile alum solution to obtain copper is chemically called displacement reaction! Huh! Why didn't I think of this~? ”

Wang Ji was puzzled at first, then patted his head and said with annoyance.

The methods of copper refining can be roughly divided into two types - pyrometallurgical copper smelting and wet copper smelting. Among them, pyrometallurgical copper smelting is to decompose malachite into copper oxide by contact with ignited charcoal, which is then reduced to metallic copper. The equation is (OH)2+C==2Cu+2CO2+H2O!

This was also the main way copper was produced before the Song Dynasty in China!

Wet copper smelting, also known as the bile copper method, has two main aspects in its production process. The first is copper immersion, that is, iron is placed in bile alum (CuSO4·5H2O) solution (commonly known as bile water), so that the copper ions in bile alum are replaced by metal into elemental copper deposits; The second is collection, that is, the copper powder that is replaced is collected, and then smelted and cast.

The Chinese were the first to use natural copper compounds for wet copper smelting, and in the Western Han Dynasty, sulfuric acid was used to react with copper oxide, and then iron was used to replace copper. Liu An's "Huainan Wanbi Shu" "Zeng Qing gets iron and turns into copper", "Zeng Qing" refers to soluble copper salt, that is, when copper salt meets iron, copper is generated.

Jin Gehong's "Hug Puzi Inner Chapter: Yellow and White" also has a record of "coating iron 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 also other soluble copper salts could also undergo displacement reactions with iron.

But these methods were only discovered by chance in the alchemy process, and were not really used in production! It was not until the end of the Tang Dynasty that the principle of water copper smelting began to be applied to production, and it was developed in the Song Dynasty and became one of the important methods for mass production of copper.

At the beginning of the Tang Dynasty, there were very few people who knew about wet copper smelting, let alone used it for actual production!

Seeing that Wang Ji reacted, Li Zexuan nodded and said, "That's right!" This bile alum copper smelting is used in the chemical displacement reaction! After a while, I will send someone to find the mine you mentioned, Mr. Wang, and find out the reserves of gallium in it as soon as possible, and then we can dig a bile water tank around the mine, forge the iron into thin sheets and arrange them in the tank, and submerge the iron pieces with bile water, and the copper in the bile alum will adhere to the surface of the iron sheets.

Although it will be more troublesome to forge iron sheets into thin sheets, our workshop now has a hydraulic stamping machine, which is not a trouble! In addition, forging iron into thin sheets can increase the surface area of iron, greatly shorten the replacement time, and improve 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 still worried about where to get some copper, but he didn't expect that there was a gallum mine on his fiefdom, and the people of this era obviously haven't realized the true use of gallum ore, otherwise this mine would have been requisitioned and mined by the imperial court a long time ago, and it wouldn't have waited until now!

When Wang Ji heard this, he couldn't help but sigh with a wistful expression: "If the gall alum in this mine is really amazing, we will be able to cover the entire Lantian County with wires~!" This kind of grand scene, Wang is looking forward to it in his dreams! ”

............................

Leaving Mo Lingwei's laboratory, Li Zexuan immediately sent Liu Feng and Liu Yun to take people to inspect the gall alum mine, and after that, he went to the edge of the Bahe River to see the progress of Zhang Hongsheng's armor manufacturing, Zhang Hongsheng assured Li Zexuan that at the latest, the day after tomorrow, he could make the first set of plate armor, and after the first set was made, the production speed would be faster and faster!

"Young master, yesterday the old man let people forge a batch of iron pieces of the same size and thickness with a hydraulic stamping machine, with these iron pieces, you can make the chain you said before, the old man has arranged for the craftsman to assemble the chain, and it is expected to be completed tomorrow!" After this has a chain, young master, have you begun to plan to build a second-generation chain drive bicycle? ”

Fu Bo was also on the side of the hydropower station, and when he saw Li Zexuan coming over to "inspect the work", he hurriedly walked over and said.

When Li Zexuan heard this, he was overjoyed, and secretly said that the backward and clumsy front-wheel drive bicycle could finally be eliminated, and he said with a smile:

"Build! Hurry up and build it! The sooner the better! Oh, by the way, Fauber, this is a chain-driven bike, even if I don't give you the drawings, you can imagine its construction, right? ”

Fu Bo nodded and said: "Young master, don't worry, the old man knows in his heart, this second-generation bicycle is just different from the first-generation bicycle in terms of transmission, and other places are basically the same, this is not difficult to decay!" ”

Li Zexuan said excitedly: "Hehe! All right! I'll just wait for Fauber's good news! The previous bicycle created a huge profit for our workshop, and now we have mastered the technology of the production chain to create a more flexible and light second-generation bicycle, I believe that more people will like it and are willing to spend money for it! In the near future, the bicycles produced by our Qiquge workshop will be all over the north and south of the Tang Dynasty! ”

Last year, because he didn't have a dam or a hydraulic stamping machine, he couldn't build a chain, so he could only build the kind of "ancient" bicycle with pedals installed on the front wheel, which was laborious to ride and easy to get bored, Li Zexuan just started to feel fresh, and he never rode again after riding for a few days, he is a modern person, and any bicycle he has ridden is 10,000 times better than that "ancient" bicycle!

But the "natives" of the Tang Dynasty like Cheng Yanjin didn't know that there were better bicycles in the world to ride, they only knew that the bicycles produced by the Qiquge Workshop were faster, more flexible, and more convenient than horse-drawn carriages, so they would ride them every day.

Now with the chain, everything is different, Li Zexuan is not only able to produce a bicycle with a chain to drive the rear wheel, he also wants to build some mountain bikes with disc brake shifting, and even wants to make electric .....

This improved bicycle is believed to not only replace horse-drawn carriages, but also horses!

.............................

Day 2.

The first thing Li Zexuan did after breakfast was to go to the hospital, and when Dr. Wang saw Li Zexuan coming, he hurriedly reported:

"Chief, this time, our Datang United Medical Center has recruited a total of 58 doctors with superb medical skills and noble medical ethics, including eight female doctors and 50 male doctors, among them, some of them are good at orthopedic and treatment of bruises, some are good at treating children's diseases, and some are good at acupuncture and massage, anyway, the departments we were divided into before have doctors who can be competent!"

Li Zexuan nodded and said, "That's very good!" The medical hall should be operated normally as soon as possible, and it should be fully open to the people of Lantian County, and all the prices and consultation fees of medicinal materials should be open and transparent, and the people should not be cheated! In addition, this female doctor is still too small in number compared to male doctors, I told you before, doctors are not divided into men and women, and in the eyes of doctors, there should be no concept of male and female gender, don't look down on each other's medical skills just because others are women, yesterday's Ge Qingyue is a good example! In the future, we will recruit more female doctors! ”

Li Zexuan heard that in yesterday's interview and assessment, Ge Qingyue "smiled proudly" with a double perfect score, I don't know how many people's eyeballs were shocked, Li Zexuan felt that he could use Ge Qingyue to set an example for women who are interested in medicine in the world, and tell the world that women can also study medicine and practice medicine, and their medical skills will not be worse than men!

Dr. Wang arched his hand and said: "Mountain Chief, after yesterday's interview and assessment, no one dares to despise female doctors anymore, the reason why there are only eight female doctors is because there are too few female doctors who come to apply!" However, today's "Datang Daily" published a notice that our United Medical Center can recruit female doctors, and I believe that soon, there will be female doctors with superb medical skills who will come to our medical center! ”

When Li Zexuan heard this, he nodded and said, "That's fine!" If there are any difficulties in the future on the side of the medical center, Dr. Wang, you can just tell He Xianling, or you can tell me. If you can help, the county government and Benhou will definitely help! ”

"Yes! Mountain Chief! ”

.........................

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 bike that Fuber was responsible for supervising were all ready!

"Yamacho, this is the electric motor, as long as it is connected to the battery, the rotor inside can rotate rapidly!"

In the Strange Pavilion Workshop, Mo Lingwei pointed to the "lump" iron lump on the ground and said.

Li Zexuan frowned, and had to admit that the appearance of this motor was a little ugly, and the shell should be directly cast, with no polishing, no quenching, and no spray paint on the surface, how ugly it is, I just don't know if this ugly thing can be used normally!

"I'll take a look when I get it!"

Li Zexuan said softly.

"Hmm!"

Mo Lingwei responded, and hurriedly beckoned Song Xiaosi next to her to move a lead-acid battery from Wang Ji.

Yan Shaoning has not come since he hurried home yesterday, and Mo Lingwei has no one to call, so she can only call Song Xiaosi!

After the lead-acid battery was carried over, Mo Lingwei placed the motor upside down, and let Song Xiaosi hold it steady, and then she went to connect the power supply herself, when the wire was connected to the positive and negative electrodes of the battery, "woo~", the motor quickly spun up!

"It worked! It worked! We have changed the way we power this era! ”

Li Zexuan looked at the motor that was spinning wildly and said with emotion.

......................

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