I ran over from afar, but told me that I didn’t have money to buy firewood. Do I want this face? But if I really want it, Tianyou really has no money to buy materials.

Heizi has already said that he would not charge his rental fee, but you can't let others pay the materials, right? Tianyou now feels a little in a dilemma.

Here, hesitating, but unexpectedly, the old man was moving quickly and had already started to add firewood to the stove. Tianyou subconsciously opened his mouth and shouted "Don't", but the old man was wrong and smiled and was kind: "It's okay, I'm idle anyway, I'll give you some help. What's the point of helping a little?"

"I'm dizzy! I'm not polite to you, I can't afford to use this stove!" Tianyou felt distressed, but he couldn't say, "I'll do it myself, old man!"

Anyway, the furnace has been turned on, so let's talk about it first! Tianyou really has no choice. It's impossible to stop at this time. Heizi obviously is not the kind of person who is good at observing words and expressions. He immediately started to help excitedly. After a while, the entire furnace was lit. The huge chimney at the tail of the centipede furnace began to emit black smoke with sparks.

Tianyou simply stopped thinking about money, or he had already thought about it, and at worst he would mortgage the worry-free bag here, and just go back to Ying Ying to settle the debt and pay it back. Now he finally knows how harmful the triangle debt is, and he is the rhythm of being cheated and going bankrupt!

Although they had decided to make things first and think about other things, Tianyou found that he had made things simple, because after the fire rose, they fell into a long wait.

The furnace temperature rise is much slower than expected.

There are valves on all the furnace openings of the centipede furnace. Tianyou kept opening the furnace openings to observe the temperature of the flame, which everyone could see that he was too anxious.

The old man looked very anxious and said comforting, "Don't be anxious. The stove will catch a slow fire, and it will be fine when it heats up. When you come, I just sealed the stove. The stove is not cold yet and it will be able to heat up soon. Usually I get up early and start to start the fire. After washing, eating and drinking, I wait for everyone to arrive, and wait for an hour to go to work. You are already fast."

When Tianyou heard the old man's words, he suddenly thought of something.

"Brother Black."

"Hmm? What's the matter?" Heizi didn't understand what Tianyou asked him to do.

Tianyou thought for a while and asked, "If there is such a thing that is very useful to the store, I wonder if Brother Hei can make the decision to pay for it on behalf of the store?"

"What's the problem with this?" Kuroko asked in confusion: "Since it is a useful thing, just buy it, why can't you make a decision?"

"Since that's the case, it's easy to do." Tianyou said: "I happen to have a technology here. What I made is worth ten thousand yuan for your workshop. I wonder if Brother Hei can make the decision?"

"Wanjin?" Heizi didn't think too much at first, but he was panicked when he heard the price. Bai. Bingfang's things are not cheap, but Wanjin is too exaggerated. "This... may need to discuss with the boss."

"It's okay, Brother Hei will contact me." This store belongs to Lu Meng. The little girl has a good time with Tianyou along the way. Tianyou doesn't think she will reject her proposal. After all, Lu Meng is actually taking advantage of this matter.

After Heizi agreed to look for Lu Meng, Tianyou didn't waste any more time. Heizi directly asked Heizi to help find tools, and then made a tool that almost everyone in later generations knew about - bellows.

Don’t underestimate this tool with a simple structure that is almost without structure. It is its emergence that has allowed humans to enter the era of large-scale use of iron tools, because bellows can greatly increase the furnace temperature. Before entering the Iron Age, the biggest problem restricting human iron smelting was that the furnace temperature could not be increased.

The metal used by humans was not iron, but copper, or bronze, that is, copper-tin alloy.

The hardness of the correct combination of bronze is actually greater than that of pure iron, and its corrosion resistance is much stronger than that of iron, but iron is still a metal that is more important than copper. There are two specific reasons. One is ferroalloy, that is, steel has higher hardness than bronze. The other is that there are a lot of iron ore.

Although hardness is also important, the second point is actually the most critical. The reserves of copper are too low to be applied on a large scale, but the reserves of iron are much more and are widely distributed, which is conducive to large-scale applications.

However, although iron ore is widely distributed and has large reserves, humans initially chose to apply bronze rather than iron on a large scale. The reason for this is the difficulty of smelting.

The melting point of copper is 1083.4 degrees, and tin is even lower. After the two are mixed, the bronze can be melted at only 1,000 degrees, and the difficulty of smelting is relatively low. But iron is different. The melting point of iron is as high as 1,535 degrees. In ancient times, there was no electric furnace, it was very difficult to heat something to more than 1,500 degrees, so the ancients had to use scarce bronze to make various instruments and weapons.

The centipede furnace in front of Tianyou is already a very high-end smelting equipment. It not only saves fuel by connecting the combustion chamber, but also increases the front furnace temperature. More importantly, it leaves a low-temperature furnace port specially used for annealing, normalizing and back-tempering.

Such an advanced smelting furnace is among the top among the ten countries, but in Tianyou's opinion, it is still not good to fall behind. Moreover, this backwardness is not even due to the lack of high-end technology, but purely because of the incompleteness of the basic theory.

First of all, the fuel used in this centipede furnace is firewood rather than charcoal, which is strange if the temperature is high.

Secondly, the furnace wall of this centipede furnace is too thick, which is said to be for insulation, but actually causes difficulties in heating. In fact, the best insulation method is not to thicken the furnace wall, but to use hollow bricks. Air is the best insulation material. As long as the convection of the air is limited, the heat loss rate of the air is actually very low by relying on heat exchange alone.

Third, that is, what Tianyou decided to improve - combustion aids.

The centipede furnace uses a tandem structure, which runs from the beginning to the end, and there is a chimney at the end. The hot air rises and is naturally discharged along the chimney, and then forms negative pressure inside the furnace body, sucking fresh air outside into the furnace chamber to help burn. To put it bluntly, this process is naturally inhaling.

No one may think that there is anything wrong with this, but Tianyou is not a person from this world, so of course he will not be satisfied with ordinary natural aspiration. Of course, a stove cannot play with turbocharge like a car engine, but it is still necessary to add an active intake, and the added device is - a bellows.

Because the structure of the bellows is too simple, it does not require processing accuracy or airtightness, and as long as the air leakage is not particularly serious, it will not affect the use, so Tianyou almost nailed a simple bellows with wooden boards in just a few seconds.

The correct way to do it was to have a simple seal between the bellows and the fire, but Tianyou only used it temporarily and didn't pay much attention to it. Heizi helped to lift the bellows to the furnace entrance and put them in a try.

Heizi and the old man didn't know what Tianyou was going to do, so he could only stare stupidly. When Tianyou pulled out the bellows lever, the two of them didn't see any changes. They were confused when they saw Tianyou suddenly pushed the lever back in. This was awesome, and Heizi and the old man almost glared out.

As Tianyou suddenly pushed the pull rod, a strong wind poured into the furnace, and the entire furnace was frying. The gaps on the edges of more than a dozen furnace doors that were not tightly sealed were whizzing out, and the chimney at the end of the furnace instantly turned into a large torch, spewing out a burst of flames more than two meters high, like a large torch.

With the shock of Heizi and the old man, Tianyou slowly pulled back the bellows lever and pushed it in again. This time it was even more scarier than before. The flames spewed out of the edge of the furnace door had changed from orange-red to bright white, and the chimney at the tail of the furnace sprayed more than ten feet high. In this dark night, the huge pillar of fire that soared into the sky could be seen almost the whole city.

Because the centipede furnace is very large, Tianyou is worried that the intake volume is insufficient, so the volume of the bellows is also very large. In addition to its power, it is beyond ordinary people, so the amount of air blowing in the bellows is quite scary. The centipede furnace itself is a sealed whole. In addition, the gas entering the furnace entrance must be sent out from the chimney except for a trace of leaking from the furnace door. Moreover, blowing a cubic air into the bellows will aggravate the combustion of the flames and generate more heat. High temperatures will cause the air to expand, so the cubic air pressed into the furnace will be more than one cubic cube when it goes out, but much larger.

This series of factors caused such a terrifying fire blowing effect, but it looked scary. The furnace temperature really came up very quickly. It was only two times. The wet linen cloth that the old man had placed outside the furnace body had already started to smoke, which means that the furnace body had been completely burned and could start smelting iron. But now, Heizi and the old man dared not let Tianyou burn again!

"Brother, please take away your magical powers! If you come to this house twice, you may be burning together!"
Chapter completed!