After visiting the third floor, Zhu Cijing was full of expectations because the extracted substances on the third floor were already liquid. The next step is fuel, which is the focus of future development. If there is fuel, the internal combustion engine will have hope. With internal combustion engines, trains and ships, the speed of the speed will be improved leaps and cars will no longer be dreams!

With excitement, Zhu Cijing quickly climbed the steps to the fourth floor. He couldn't wait to see if Song Yingxing really refined diesel, kerosene and gasoline.

The temperature of the fourth layer is a little lower than that of the third layer, and it has dropped to a level that ordinary people can tolerate, and the air is filled with moisture.

From the appearance of this floor, this floor is similar to the first three floors. There is still a blast furnace in the middle, not like a blast furnace, and the room is not like a giant in the room. It also leads into the inside like a door hole. There are also two people standing next to the opening. It seems that the outer layer is used for heat insulation. Song Yingxing didn't spend too much effort, so it all looks the same.

So what does it look like inside? Zhu Cijiu curiously put his head into the door hole and looked at it. It turned out to be a huge iron can. However, this iron can is a bit similar to a common boiler, but it is much larger.

After feeling the moisture in the air, Zhu Cijing turned around and asked, "Is this layer heated with steam?"

Song Yingxing nodded and said, "Yes, the emperor, because the things extracted from several temperatures at the beginning were too easy to catch fire. After experimenting many times, Weichen thought it was safer to use steam to heat it, so he added a steam tank between the oil storage tank and the coal fire. He first heated the steam with a coal fire, and then heated the oil with steam."

Sure enough, fuel is flammable and explosive. It is really too dangerous to heat it directly with fire. The steam in the compartment is safe. Judging from Song Yingxing's description, starting from this layer, the fuel should be extracted. Zhu Cijing couldn't wait to say: "What about the things extracted from this layer? Take it to take a look."

Upon hearing this, Song Yingxing quickly asked the person on duty to go to the storage room to pick it up.

Soon, the on-duty staff on this floor brought an iron bucket. The things inside were obviously liquid and should be fuel.

Zhu Cijiu looked carefully and found that it was black in the gray, which looked a bit like heavy oil. He dripped it a little more and put it in front of his nose and smelled it carefully. It turned out to be the smell of diesel!

He understood that this should be a mixture of heavy oil and diesel.

Heavy oil is generally used on large generator sets and large ocean-going ships and requires heating to be used, while diesel can be used on ordinary trains, cars and small ships and can be used at room temperature. There is a difference between these two oils. How to explain it?

Looking at Song Yingxing's eager eyes, Zhu Cijing sorted out his thoughts and then mentioned: "This oil is not pure yet, so it must be separated and separated into two types of oils. One is a slightly yellow and transparent oil like rapeseed oil, called diesel, the remaining one is slightly black, and the more sticky one is called heavy oil. You can send diesel directly to Wang Zheng and ask him to study the new car power. If you have heavy oil, you send it to Xu Fuyuan and Xia Yunyi to see if they can make a larger generator."

When Song Yingxing heard this, he was so excited that he finally understood the purpose of the emperor asking him to study oil refining. These things are too useful for refining them. They are like steam engines and are the foundation of other industries. Being able to engage in such important research is a great honor. He nodded heavily and said, "I understand."

Zhu Cijiu nodded, took the lead in stepping onto the fifth floor.

Before I could reach the fifth floor, a strong smell of kerosene came to me.

Kerosene is definitely kerosene, and Zhu Cijing couldn't help but speed up his pace to walk towards the fifth floor.

The temperature of the fifth layer is much lower than that of the fourth layer, and the air is still wet. Needless to ask, Song Yingxing used steam heating again.

Needless to mention the shape in the middle of the five layers, it is the same as the first four layers, but there is a big difference inside. In addition to a large iron can, there is also a small iron can next to it with a pipe connected to the large iron can. The height difference feels like distilled liquor.

This time, Zhu Cijing felt that the temperature inside was not very high and wanted to go in and take a look. However, he was about to walk in, but the two door-holes stumped him and looked at Song Yingxing in embarrassment.

Seeing this, the Jinyiwei and the Dongchang masters on both sides pressed their hands towards the handle of the knife. As long as the emperor spoke, they would chop people!

Zhu Cijiu looked back at Song Yingxing for no reason. Can't we just go in here?

Song Yingxing didn't know if it was hot or something, but a lot of people burst out from his forehead. He explained in panic: "The emperor calmed down. It was very dangerous here. Weichen had stipulated that those who had not been trained were not allowed to enter."

Upon hearing this, Zhu Cijiu immediately retreated. It was not that he was afraid of danger, but mainly to comply with the regulations of the experimental field. He knew that many experiments were very dangerous. If he did not follow the regulations, he would die if he died, and if he was seriously damaged, he might destroy the entire experimental field.

However, he really couldn't see the danger here. He couldn't help but ask curiously: "Isn't this a hot topic? What's the danger?"

When Song Yingxing saw that the emperor had retracted, he breathed a sigh of relief and explained carefully: "Prince, it is indeed very dangerous here, because the steam inside is not ordinary steam. When the oil was extracted, several accidents occurred directly and burned several people. So Weichen thought of using steam to heat the oil first. However, after many experiments, Weichen found that if the steam was burned open, the temperature would not rise. Later, Weichen sealed the steam and continued to burn, so that the temperature could rise."

Zhu Cijing didn't understand even more. Isn't it just a little higher temperature? He asked in confusion: "Is it okay if you don't touch it, and there are other dangers?"

Song Yingxing nodded in panic and said, "Yes, when the experiment was first to seal the heated steam, the jar was not sealed. The steam was heated for a while and it sprayed out from a crack, directly spraying a person's hands! Therefore, Weichen stipulated that the place where the steam was sealed and heated was not allowed to enter."

Zhu Cijiu was startled when he heard this. Only then did he realize that it was high-pressure steam. That thing was indeed very dangerous. He nodded and said, "Well, you are right to do this, I won't go in. Take this layer of refined things to see."

Upon hearing this, Song Yingxing ordered that the staff on duty soon brought a porcelain jar, which seemed to be a jar for wine!

Zhu Cijing said in surprise: "Is this to prevent evaporation?"

When Song Yingxing heard this, he said in surprise: "Volatile? The emperor's word is really wonderful. Indeed, if it is open and it will go down a lot in a few days, it should be evaporated, so the empress is asked to seal it with a jar of wine."

When Zhu Cijiu heard this, he nodded, went forward and took the sandbag pressed on the jar and sniffed it gently. It was indeed kerosene, and the kerosene inside was relatively clear.
Chapter completed!