The trial production link is the most critical link in the entire Yu's Seven Towers project. Through the trial production link, the production efficiency data, quality data, performance parameters, and the most critical actual output data of the product are obtained. In addition, there are still inspection margins.

Is the seven-tower unit running stably and reliably? There are loopholes in some manufacturing links.

If the actual output of Yu's Seven Towers cannot meet the design standards and there are errors in the operation of trial production, it will mean rework and delay the manufacturing schedule.

However, the only good thing is that for the environment of the era of 1937, there was no need to consider issues such as high energy consumption, high pollution, and environmental protection. As for the materials and documents that countless corporate project personnel in later generations were worried about, it was even more

does not exist.

In the trial production process of Yu's seven-tower prototype device, the core performance indicator is the actual output.

The designed output is 22 tons in 24 hours, and the output per hour is 0.916 tons. The actual output reaches more than 95%, which can pass the production standards set by Yu Hua.

In the experimental site, Lin Wan, as the deputy team leader, is leading team members such as Fang Yu and Zhou Yuan, as well as a team of welders to conduct a final safety inspection to check whether there are gaps in the welds connecting the pipelines, their firmness, and the lines and centrifugal pumps.

etc.

This is the last safety inspection before trial production and must be carried out extremely carefully.

Lin Wan and others braved the scorching sun, climbing up and down, carefully checking the pipelines between the core containers of the Seven Towers of the Yu Family. After checking the last core container, Lin Wan, who was completely soaked with sweat, stood.

On the metal scaffolding, he raised his right hand high like a braised pig's trotter, giving a thumbs up to Yu Hua.

This means passing the inspection.

After more than half a month, Lin Wan's skin darkened at a speed visible to the naked eye, and the skin even peeled off her shoulders.

Immediately afterwards, team members Fang Yu and Zhou Yuan all gave a thumbs up, indicating that the inspection passed.

At this moment, Xiong Shenggang and the nine welders, who saw the actions of the three people, finally breathed a sigh of relief and relaxed slightly.

For them, this safety inspection before trial production is nothing more than a 'graduation exam'. Fortunately, everyone passed this graduation exam.

However, now is not the time to celebrate happily.

As the core members of the design team passed the inspection, the workers surrounding the experimental site, including Liu Wei and the elegant man, all understood that the most critical moment had come.

"Each team is ready to enter the trial production phase." Yu Hua stared at the Yu's Seven Towers prototype device that had passed the last safety inspection in the experimental site, took a deep breath, and issued instructions as the team leader.

The big thing in front of him is the second work that condenses his countless efforts.

Whether we can succeed or not depends on today!

I have been working hard to forge a sword for a month, now I will test my edge.

If this 'sword' is sharp, it can cut out the future of the China Chemical Industry Building and fill in the gaps left by the China Chemical Industry.

Following the order from the top leader of the project, several production teams that had been trained to a qualified level quickly entered the experimental site and went to their respective posts. Although these warrior production team members had no academic qualifications and were not literate, they won. With a flexible mind and strong execution ability, he can complete the "parts" responsibilities well.

As long as each 'part' can operate normally and play its role, then Yu's Seven Pagodas can operate normally.

Soon, all production teams were on duty.

"Seat No. 1 is ready!"

"Seat number two is ready!"

"Position three is ready!"

One message after another was sent back to Yu Hua through the dispatcher at the experimental site. A few minutes later, all the production teams at the production station were ready.

At this moment, everyone is paying attention.

Everyone present held their breaths, and the elegant man was concentrating on it. With a pair of star-like eyes, he stared at the Yu's Seven Towers, which was completely beyond his imagination and full of industrial beauty. He clenched his right hand slightly, and there was a trace of worry in his heart.

Liu Wei didn't say a word, he was breathing slightly, his heartbeat was a little faster, and his focus was entirely on the experimental site. After working in the revolutionary cause for so many years, he had never been so nervous and expectant as he was today.

At this time, everyone was silent.

"Connect the power to the unit, feed the boiling furnace and ignite it." Yu Hua gave instructions in an orderly manner to the dispatcher holding a flag.

The dispatcher immediately waved the two flags in his hand and conveyed instructions to the production teams staying in different areas and locations of each device. Immediately afterwards, Yu's seven-tower unit was powered on, and the fans installed at the bottom of the two boiling furnaces entered working status and rotated at high speed. The air is extracted into the boiling furnace, sprayed out at high speed through the small holes in the refractory base layer at the bottom of the furnace, and impacts the quartz sand from top to bottom.

At the same time, the feed port opened the closed warehouse door, and countless light yellow solid sulfur particles as big as rice grains poured into the boiling furnace like water flow, rising and flying under the action of high-speed airflows, doing Brownian motion. , then, the furnace lance is ignited, and the sulfur particles fully combined with oxygen burst into flames, burning violently under the influence of oxygen, emitting a beautiful blue flame.

This is a fluidized bed boiling furnace design born in the 1950s. It has low technical content. It consists of a furnace, a refractory base layer, and a fan. Its advantages are full combustion, easy control, simple production and manufacturing, and it takes into account both sulfur combustion and iron sulfide powder gas production. The disadvantage is that quartz sand causes serious wear and tear on equipment, has high smoke and dust content, and causes high pollution.

However, there is no need to worry about the shortcomings of smoke pollution.

In the fluidized bed boiling furnace with a radius of 1.5 meters and a height of 3 meters, countless violently burning sulfur solid particles and quartz sand are constantly rolling and boiling like boiling water. The high-purity sulfur produced after the sulfur is burned combines with oxygen to form a high-temperature state. The sulfur dioxide passes through the metal pipe connected to the cold water. After cooling, the temperature drops to about 450 degrees Celsius, and flows towards the first core container and the second core container.

With the continuous supply of high-temperature sulfur dioxide gas, the acid-forming tower and the denitrification tower entered working state one after another, and the large centrifugal pump started to rotate and pressurized the gas.

In the experimental site, white steam slowly emerged, and the sound of the fan running and the sound of the large centrifugal pump complemented each other, playing a symphony unique to the chemical industry.

The high-temperature gas treated in the acid-forming tower and the denitrification tower passes through the metal pipeline and flows into the No. 2 acid-forming tower again. The sulfur dioxide generates nitrate-containing sulfur trioxide under the oxidation. These nitrate-containing sulfur trioxides at a pressure slightly higher than atmospheric pressure and high temperature

The sulfur gases continue to flow to the next core container. They have to undergo decontamination and oxidation treatment to remove the nitrogen oxides and nitrates contained in them, forming dilute sulfuric acid with a mass fraction of 76%, which is then sprayed with concentrated sulfuric acid to increase the concentration.

.

In the concentrated sulfuric acid spray treatment process, except for the first portion of the original concentrated sulfuric acid, the remaining concentrated sulfuric acid is supplied from the internal circulation.

The prerequisite for producing sulfuric acid is that you must first have concentrated sulfuric acid.

Chemical reaction formulas appear simple and concise on paper, but in the actual production process, they appear extremely complex.

As time passed, everyone became more and more nervous. Lin Wan, Fang Yu and Zhou Yuan held their breath, not daring to take a breath. Only Yu Hua had a calm face, bright and natural eyes, and did not show any signs of panic.

Perhaps because he felt Yu Hua's calmness and composure, even though the people around him were anxious and nervous, they still held firm and did not lose their balance.

Ten minutes later, pure, colorless, oil-like finished sulfuric acid finally flowed out from the metal pipe opening connected to the steel sulfuric acid storage tank at the end of the Yu's Seven Towers device.

"Yes, sulfuric acid is coming out!" In an instant, the two members of the production team in charge here immediately became excited and hurriedly reported the situation to the dispatcher not far away.

As soon as the news came out, it swept through everyone in the experimental site like a bombshell. After a short period of calm, the entire Liucun Experimental Site was boiling. Workers involved in the construction of the project cheered and were excited, and some even flashed.

Symbolizing tears of hope.

For them, highly corrosive pure sulfuric acid is the real hope.

"Huh..." Lin Wan and Fang Yu, who were nervous inside, breathed a sigh of relief.

"Haha, there's sulfuric acid!" Zhou Yuan shouted excitedly.

The elegant man and Liu Wei also showed expressions of joy and excitement. Their eyes were filled with joy as they stared at the thick light yellow exhaust gas being discharged into the blue sky.

"Collect samples."

Yu Hua's face remained calm, and he didn't care about the excitement of the people around him, and said seriously.

In an instant, the dispatcher conveyed the order. The production team located at the metal pipe mouth at the end of the production device immediately executed the order. One person immediately opened the metal valve on the main pipeline in accordance with the pre-existing procedures. One person wearing protective gloves held a five-capacity pipe in his right hand.

100 ml glass beaker to collect samples.

The sample needs to be divided three times, with an interval of more than one minute each time, and the total quantity is 1.5 liters. The detection method is chemical detection, using a phenolphthalein indicator to conduct a standard alkali solution neutralization titration experiment.

Three minutes later, the sample collection was completed and delivered by a member of the production team in person, and placed on the podium where various chemical instruments were arranged.

As the team leader, Yu Hua conducted the first sample quality inspection under the spotlight. The three Linwa people stayed nearby and carefully watched Yu Hua's operating steps and techniques. The others stared nervously at the podium.

Let Yu Hua conduct an extremely critical test.

The final result of the test is crucial, and this waiting process is tantamount to the moment of giving birth to the workers around.

"The quality scores are all 98%, and the quality is qualified."

After completing the standard alkali solution neutralization titration experiment, Yu Hua calculated based on the experimental weights and parameters given by the three bottles of samples, and finally obtained the mass fraction data of the three bottles of samples. He nodded and announced the test results.

After the quality inspection passed, everyone breathed a sigh of relief again and showed joy again.

This is the second good news.

"Comrade Yu, what are we going to do next?" At this time, the elegant man came up and asked Yu Hua.

"wait."

Yu Hua greeted Lin Wan and signaled to record the data, then turned around with a look of respect on his face and explained carefully: "Now the mass fraction of the finished sulfuric acid has been obtained. After 24 hours, we only need to obtain the flow rate

By measuring the sulfuric acid flow rate data, the actual production parameters can be obtained. If the first experimental trial production reaches more than 95%, that is, 20.9 tons per day, it is considered qualified."

Lin Wan nodded and quickly took charge of recording the quality score data.

"Is thirty tons of sulfur enough?" The elegant man nodded after hearing this. He had an idea in his mind and continued to ask.

"Enough, the molecular weight of sulfur is 32. One ton of sulfur can produce three tons of sulfuric acid. In theory, thirty tons of sulfur can produce ninety tons of sulfuric acid." Yu Hua nodded and smiled. One ton of sulfur, three tons of acid, this is the standard.

"Ninety tons of sulfuric acid?! According to the current sulfuric acid price of 300 silver dollars per ton on the market, doesn't it mean that the sulfuric acid produced from this sulfur is equivalent to 27,000 silver dollars!" The elegant man was startled when he heard this data, and his mind immediately reacted,

Somewhat incredible.

Since sulfuric acid is one of the strategic resources and is highly regulated by the government, sulfuric acid and other chemicals on the market in Beiping are now very scarce and in short supply. The price of 80% concentration sulfuric acid products has reached about 180 silver dollars per ton, while 98%

High-concentration sulfuric acid can reach 300 silver dollars. The key is that it has a price but no market.

The value of 90 tons of sulfuric acid is as high as 27,000 silver dollars.

How much does it cost?

Thirty tons of sulfur cobbled together here and there are not easy to buy, but the price is only about 50 oceans per ton, and the gap between cost and total value is six times.

Darling, the Yu's Seven Pagodas in front of you are not producing sulfuric acid, but producing 'money'!

As soon as the machine is turned on, money flows out like water.
To be continued...