When the entire ninja world knew that there was a serious shortage of water in the Land of Wind, it was basically impossible for the residents of the Land of Wind and Sand to buy cheap fresh water.

There have never been fewer difficulties such as sitting on the ground and asking for cards, even the strategic materials sold to the Sand Hidden Village by Konoha Village, which is an ally, are much higher than the market price.

In a sense, there are not a lot of precious metals in the Land of Wind, but the money will never be enough, and it is inevitable that key resources will be controlled by others.

In the past, Daimaru had thought about it for a long time and wanted to find a way to alleviate the water shortage in Shayin Village, but it was not practical.

The most direct means, of course, is to use the power of ninjas.

Can Aqua Ninja desalinate seawater?

It should be possible, but Daimaru doesn't know.

However, how many water ninjas does it take to support a ninja village, or even the freshwater of a big country?

With this spare time, it may be more cost-effective to let these ninjas do tasks and use money to buy water.

What's more, there aren't many ninjas in Sand Hidden Village who are good at water escape.

"Purely relying on "manpower" will not solve the problem!"

It is not difficult to draw this conclusion.

So Daimaru whimsically thought of using the "filthy earth body" of the infinite chakra to help.

Let's not talk about whether it can be realized, at least the current Daimaru doesn't have the ability to learn such an S-level forbidden technique as Filthy Earth Reincarnation.

The ideal desalination method in Daimaru's mind for the village should be the limited participation of ninjas, using ninjutsu to cross the key technological gap, and then using ordinary people and even natural forces to desalinate a large amount of seawater.

In view of this, solar heating distillation was the first to be eliminated among several suitable methods, and the amount of fresh water prepared was too small.

The advantages and disadvantages of reverse osmosis are very obvious, and the biggest problem is that the chemical technology of the ninja world is too backward, and there is no way to produce cheap and efficient reverse osmosis membranes.

Originally, the most energy-efficient low-temperature multi-effect distillation desalination technology was Daimaru's most promising method, but unfortunately, the material, heat conduction and exchange, and process maturity were far from reaching the desired height.

As for those desalination methods that seem to be more high-end, but more difficult, there is basically no possibility of achieving them in the ninja world.

In the end, only one of the more traditional desalination technologies stood out.

That's multi-stage flash evaporation.

In terms of energy saving, multi-stage flash evaporation is far less effective than low-temperature multi-effect, but it is better in that the process is simple, the material requirements are not high, and the technical ability of Shayin Village can be completely realized.

The most important advantage of Daimaru is that the amount of seawater desalination is very large in a short period of time.

In addition to this, the safety is high, and ordinary people are also competent enough to operate; If you are a ninja, you can even take advantage of your extraordinary strength.

In the end, there were two other points that made Daimaru decide to choose multi-stage flash evaporation, one is that it can be combined with thermal power stations to prepare fresh water with the help of waste heat from power plants; The second is that it is especially suitable for the puppet technology of the unique ninja world in Sand Hidden Village.

The entire ninja world is in the transition stage from the steam age to the electricity age, and because the petrochemical industry has not developed, the internal combustion engine has no room to play.

Stupid and stupid, this is the current status quo of the ninja industry.

High power consumption, high output, and low efficiency are the mainstream of mechanical and electrical devices.

This level of technology is especially suitable for ultra-large thermal power plants and multi-stage flash desalination units.

As for the coal and iron resources needed for thermal power plants, and the pollution they bring, the ninja world has not yet reached the point where it needs to be considered.

"A power generation and multi-stage flash desalination plant by the sea is enough to support a small town!"

The industrial town that thrived because of the factory is rare in the ninja world, and there are many Daimaru before the crossing.

There should be a great possibility that the idea will be realized, but the problem is that the upfront investment is too scary, and it is impossible for the village to invest too much money without seeing Daimaru make water.

But without strong support, where did Daimaru turn into a power plant and a desalination plant?

"How can I convince the elders who have no concept of industrialization or scientific spirit to agree with my ideas?"

At present, the biggest problem is to convince others that the so-called "multi-stage flash desalination seawater technology" is not Daimaru's nonsense in order to cheat money.

The principle is actually not complicated.

Everyone knows that water freezes at zero degrees Celsius and boils at a hundred degrees Celsius.

Because water is not completely pure, the above temperatures vary slightly depending on the solute.

However, this boiling point of 100 degrees Celsius is actually the temperature at standard atmospheric pressure, and if the air pressure decreases, the boiling point temperature will also decrease, so theoretically, the boiling temperature of water at the top of the Himalayas is much lower than the boiling point of water at sea level.

Multi-stage flash evaporation is a seawater desalination technology designed according to such differences.

The waste heat of steam from a thermal power plant is used to heat the seawater to a very high temperature, such as 98 degrees, but it does not boil.

At this time, 98 degrees of water is injected into a flash chamber with low air pressure, and the water will boil at 95 degrees Celsius.

But at this time, the water in the flash chamber is already ninety-eight degrees, exceeding the boiling point, at this time, what will happen? Obviously, water above the boiling point will quickly evaporate a large amount of water in a very short time, taking away the heat and lowering the water temperature to below 95 degrees, a process called "flash evaporation".

And after the condensation of the evaporated water, it is fresh water.

Next, hot seawater, which has been lowered to below 95 degrees Celsius, is injected into a flash chamber with a lower air pressure and a boiling point of 90 degrees Celsius, and a large amount of water is condensed into fresh water.

Repeating the above process, the air pressure of the flash chamber can be reduced step by step, and a large amount of seawater can be desalinated in a short time, which is "multi-stage flashing".

The principle is simple, the actual operation is slightly complicated, but it is not too difficult, it depends on whether the process is reasonable and the efficiency is high.

The "multi-level flash evaporation" technique is not very clever, but it is definitely a method suitable for the ninja world, especially in the Sand Hidden Village, which has the ability to create large puppets, some operations that are not suitable for civilians or even ninjas can be completely replaced by puppets.

Such a desalination technology cannot provide cheap water for the residents of the Land of Winds, but it is of great significance.

It is difficult to achieve "good quality and low price" in one step, first to achieve "good quality", "low price" problem slowly, more importantly, to a certain extent, you can get rid of the dependence on external input of fresh water, and in the future, you can also be a little harder.

However, the scene envisioned by Daimaru is more like a conjecture, there is no physical proof, who believes it!

Just when Daimaru was at a dead end and had nothing to do, the Shangnin Centipede, who was originally just a general friend, came to the door and seemed to want to talk to Daimaru about a slightly mysterious topic......