In the Taiji Hall, Li Shimin and Fang Xuanling both stared at Li Kuan and lit the honeycomb coal stove with a fire breaker.

After listening to Li Kuan's words just now, they already have a simple understanding of the situation of honeycomb coal, and now it depends on whether the facts are the same as what Li Kuan said.

"Your Majesty, the first time you use a honeycomb coal stove, you need a little charcoal or other flammable things to help ignite the honeycomb coal. After that, it is only necessary to replace the honeycomb coal one by one after it has been burned. ”

Li Kuan also used honeycomb coal when he was a child, and this cheap thing, even when Li Kuan was crossing, was also used in many rural areas.

"According to what you say, isn't the honeycomb coal burning all the time, too wasteful?"

Li Shimin can be regarded as a frugal emperor, at least in his early years.

So after listening to Li Kuan's words, his first reaction was waste.

"Your Majesty, you're on the point."

Li Kuan put his hands on the honeycomb coal that was beginning to turn red, answered Li Shimin's question unhurriedly, and gently patted a sycophant by the way.

"If the general furnace is not extinguished and burns all the time, it will definitely be a waste of materials, and even more waste than used. But His Majesty has noticed that my honeycomb coal stove is different from ordinary stoves. ”

"What's the difference? Except for the slightly strange shape, I don't see much difference from the carbon furnace. Li Shimin circled around the honeycomb coal stove and looked at Li Kuan with a little confusion.

"Yes, it doesn't make much difference, but do you see this little piece of iron?"

"Little piece of iron? This is what you're talking about, what's the use of it? Li Shimin saw that there was a round iron sheet under one of the sides of the entire stove.

"That's right, here's the magic." Li Kuan showed a smile that met social expectations, "When I explained carbon poison just now, I mentioned the principle of combustion. If the burning object does not come into full contact with the air, it will burn inadequately, or even not burn......"

Before Li Kuan finished speaking, Fang Xuanling suddenly slapped his head, "I probably understand, could it be that this little iron sheet is in contact with the air from the vacant honeycomb coal?" Open it when you need to use it to allow the honeycomb coal to burn fully; Cover it when it is not in use, so that the honeycomb coal does not burn as much as possible, so that the honeycomb coal can become more resistant to burning. ”

As soon as Fang Xuanling said this, Li Shimin quickly understood, "In this way, this honeycomb coal and honeycomb coal stove are really good things, and they are very suitable for every household." By the way, is this honeycomb coal expensive? ”

"Your Majesty, the cost of this honeycomb coal is very low, an ordinary craftsman can process two thousand a day, counting the personnel who excavated and crushed the coal mine in front of him, an average person can also have more than five hundred outputs, so Weichen thinks that five honeycomb coal for a penny is a more suitable price."

Li Kuan likes money, but he is not the kind of person who can take advantage of the fire to rob for money.

Chang'an City and even Guanzhong Road are in great need of heating materials during this time, and if there is cheap honeycomb coal, at least half of the problems can be solved.

"Five for a penny? His Royal Highness the King of Chu, an ordinary family of five, how many honeycomb coals do you need in such weather? ”

Fang Xuanling looked at Li Kuan a little nervously, for fear of hearing a very high number.

If honeycomb coal wants to enter thousands of households, it must have the attributes of cheap and easy to use, otherwise it is useless no matter how good it is.

Li Kuan: "In this kind of weather, if you live at home all day, heating will consume more coal, and you will need about ten honeycomb coals; If you save a little, seven or eight will do. ”

Li Shimin: "Is it just simple heating or does it include cooking with two meals a day?" ”

Two meals a day, you read that right.

In the Tang Dynasty and even most feudal dynasties, ordinary people eat two meals a day.

The so-called sunrise and sunset rest is not such a thing as lunch for ordinary people.

At most, when the farm is busy, two meals in the morning and evening are a little thicker.

"Nature is not included. In fact, the use of this honeycomb coal stove is often a combination of heating and heating. An iron pot is placed on top and filled with water, which can neither delay heating nor boil water. In the same way, it is also very convenient to eat something with stew. ”

Looking at the appearance of Li Shimin and Fang Xuanling, it seems that there is a large-scale promotion of honeycomb coal, and Li Kuan naturally wants to seriously introduce the advantages of honeycomb coal.

All kinds of things sold in his palace, and he still expects the mines outside the city to become mountains of gold and silver, so that he can buy them back.

"If the weather is not cold, how many honeycomb coals does the average person need a day?"

Fang Xuanling already had a plan in his heart, and it seemed that there was a way to deal with this inverted spring cold, but at this time he began to pay attention to more long-term things.

It is worthy of the ages.

"Fang Xiang, if ordinary people simply cook, three or four honeycomb coals a day are enough, and two or three yuan may be enough for more saving."

Fang Xuanling silently calculated an account in his heart.

If you have two or three yuan a day, it will cost half a penny, which is more than ten pennies a month.

Placed in the mountain people, naturally it is not a small number, they cut firewood very well, and there is no need to use honeycomb coal.

But for people in Chang'an City, whether it is to buy firewood or charcoal, they need more than a dozen yuan a month, and now honeycomb coal is convenient and cheap, so there is no reason why it is not popular.

"Your Majesty, outsiders have a lot of misunderstandings about His Royal Highness the King of Chu, even Weichen didn't understand the intelligence of the King of Chu before. The coal mines outside the city have been mined since the time of the former Sui Dynasty, but it has not been until now that His Royal Highness the King of Chu has really played its role, which is really turning waste into treasure and benefiting the country and the people. ”

Li Kuan solved the matter that Fang Xuanling had been worried about recently, and he naturally did not hesitate to praise a few words.

"This Kuan'er finally did a serious job. However, Wuji has looked away this time, and the nobles of the entire Chang'an City have looked away. ”

Li Shimin didn't have a smile on his face, but he was satisfied in his heart.

"30,000 guan sold the coal mines, the eldest grandson's family thought it was sold at a good price, if someone wants to buy those coal mines in a few days, Weichen estimates that His Royal Highness the King of Chu may not be willing to sell it with 300,000 guan."

Fang Xuanling glanced at Li Kuan with a smile.

"Xuan Ling, don't praise him, otherwise maybe he will do something unreliable again. The top priority is to immediately increase the production of honeycomb coal, so that the people of Chang'an City can use honeycomb coal in the shortest possible time! ”

As soon as Li Shimin's words came out, Li Kuan seemed to see countless copper coins coming towards the Chu Palace, inexhaustible.