As the source of life, water usually accounts for up to 70% of the average human body. It can be said that humans are composed of water. Humans can survive for about seven to ten days without food. Of course, there are some exceptions that can survive for as long as seventy-four days.
, this record was set by Terrence McSwain, a political prisoner under the old Irish government.
However, if the human body is separated from the water source, it can generally only survive for three to five days.
Therefore, in all construction plans of the shelter, the water circulation system is the top priority.
The natural water circulation system usually combines the atmosphere, hydrosphere, and lithosphere through a series of processes and links such as evaporation of various water bodies on the earth (including plant transpiration), water vapor transport, precipitation, infiltration, surface runoff, and groundwater runoff.
It is organically connected with the biosphere to form a huge "water circulation system".
The water circulation system of Xiongan Shelter No. 1 can be said to have almost perfectly restored the system of nature, and achieved record water circulation efficiency.
This water circulation system not only refers to the various circulation equipment in the deep well circulation area in the right leaf of the lowermost layer of the shelter, but also includes various ancillary facilities such as water transportation, recycling, water vapor collection and reuse throughout the shelter. It can be said that water circulation
The system is everywhere, including the entire shelter.
And attached to this huge water cycle "tree" are many cultivation systems that rely on the water cycle system, such as marine algae breeding pools for self-sufficiency in shelters, photosynthesis oxygen supply chambers, etc., all of which are water cycles.
There are fruits on a "big tree", so once there is a problem with the water circulation system of the shelter, it will be a devastating blow to the entire shelter.
Now, after a preliminary accident investigation, the cause of the overflow problem in the bottom sewage sedimentation tank is that the pressure pump responsible for the two-way transportation of sewage and clean water was damaged. The three pressure pumps are 19 meters high and 7 meters in diameter.
It is manufactured by Xingyi Heavy Industry, a subsidiary of Shengfengmao. The factory date is March 3, 2140. It was originally used in the ocean water circulation and purification system of the Nanhai No. 3 Experimental Ecological Zone. It was later transformed and used as the internal water circulation of the shelter.
System sewage and purified water are transported in two directions for use.
At the beginning of installation, considering that the interior of the shelter may be closed for a long time, the three pressure pumps have been reinforced and reinforced, and a complete set of laser self-checking and maintenance devices are built inside to prevent serious problems in the pressure pumps.
Submit issues before damage occurs to ensure proper operation of the pressure pump.
However, after more than a year of operation, the person in charge of monitoring and maintenance of the water circulation system felt that the laser self-checking function inside the pressure pump was too sensitive. Many times, small metal fragments appeared in the sewage and got stuck inside the pump body.
This causes the pressure pump to stall, which causes great trouble to the maintenance personnel of the water circulation system. Many maintenance personnel say that such a small problem does not require extensive disassembly and cleaning. It is not only time-consuming and labor-intensive, but also easily leads to the leakage of the pressure pump itself.
Lowering it will cause serious damage to the pressure pump sooner or later.
So after discussion with the supervisors, they privately adjusted the laser self-test standard value of the pressure pump without permission from their superiors. The advantage of this was that the workload of the maintenance personnel was suddenly reduced by half, and everyone's mood became stable.
, but they ignored a more serious problem, that is, these three pressure pumps were originally designed and produced according to the seawater self-purification system. Even after secondary strengthening and transformation, the pressure pumps themselves did not consider that there would be a large amount of water in the transported water.
particles and even metal fragments, so if the siltation and blockage problem is not cleaned up in time, it can easily accumulate into a big hidden danger.
Finally, after a month of load operation, two of the three pressure pumps experienced serious failures.
After the shutdown, the maintenance personnel entered to clean it but found that the turbine inside the pressure pump used for water absorption and transportation had been shattered by debris. There was no way to effectively adjust the sewage in the sedimentation tank between the three different levels of sedimentation tanks.
After discovering the problem, the supervisors made an even bigger mistake! They concealed the truth and planned to use their own methods to remedy the problem.
They prepared a total of three plans to replace the turbine blades. The first plan took a long time and required three pressure pumps to stop running at the same time. When the power was cut off, the top cover of the pressure pump was removed and the turbine energy guide shaft was removed.
Dismantle the whole thing, and then replace it with a new turbine. It will take at least a week to dismantle and install the second turbine, and the current purified water storage is enough for the entire shelter to last for three days at most, so the first option was quickly replaced.
turn down.
The second solution is very short-term, but the risk is also very high! That is to cut the damaged turbine blade directly inside the pressure pump and then re-weld the new turbine blade. The advantage of this is that there is no need to increase the pressure of normal operation.
The pump is shut down, and only one day is enough. But considering the problem of solid welding, the managers of the water circulation system must second a group of senior welders and a complete set of/emergency welding equipment from other departments, which involves different departments
Considering that the problem was likely to spread before coordination was completed, the managers finally decided to abandon the second plan.
The third plan, which was also the one that eventually led to the accident, involved almost no time loss. That was to restart the two pressure pumps that had automatically shut down due to faults. However, because the internal turbines had been damaged, the work efficiency would be greatly reduced.
.The supervisors felt that the two pressure pumps were simply damaged.
, it was not really that it could no longer work, so they decided to forcibly increase its output efficiency by increasing the load power of the pressure pump. However, considering that the remaining turbine blades might continue to be damaged, the supervisors also formulated a three-hour shutdown schedule.
Examine the internal rotation strategy to deal with this dilemma.
Logically speaking, if the executives of the internal water circulation system of Xiongan No. 1 Shelter can report the problem as soon as possible and adopt the first set of solutions, the problem can definitely be solved securely. At most, the entire shelter can be implemented once
A water-saving emergency plan that lasts for two to three days is enough. But it can solve the problem from the root. At most, these senior officials can only receive talks and face-to-face reprimands.
But they were so clever that they concealed their mistakes and even came up with countermeasures to increase the load rate and make the three-hour rotation shutdown less superficial. This major decision-making mistake directly led to the already scarred two people.
The pressure pump was completely paralyzed.
Sewage collects from all directions in the shelter. The seven sewage sedimentation tanks No. 1 to No. 7 can accommodate 130,000 cubic meters of sewage for simultaneous primary sedimentation. However, due to damage to the pressure pump, the surface sewage cannot be effectively transported to the secondary sedimentation tank.
Purification and reprocessing eventually led to the sedimentation tank overflowing.
When the foul-smelling sewage overflowed from the sedimentation tank, the supervisors of the water circulation system were still imagining that the two pressure pumps could be restarted under high-load voltage transmission. As a result, the two pressure pumps did not move, and the next door was responsible for power transmission.
The controllable nuclear fusion staff discovered the anomaly and reported the situation promptly.
After much back and forth, the shelter's senior management finally discovered that there was a fire in the backyard.
Before Masato Shimizu arrived, seven senior managers and three technical consultants had been taken away by Zhang Yenan's people, and the rest were left behind under the gunpoint of the special service team members to prevent the accident from deteriorating into a disaster.
The man who was slapped in the face by Masato without even daring to fart was one of the leaders of the nineteen maintenance teams within the water circulation system. The area he was responsible for was the three pressure pumps, and he was also the first
Feeling that it was unfair, he stood up to protest against his subordinates, and then privately discussed with the supervisor and modified the sensitivity of the pressure pump laser self-test, which was the source of all evil.
Such people would have been pulled out and shot long ago during the war.
However, even if he has not been shot yet, what awaits him may be more than ten years of reform through labor and restricted imprisonment... Of course, the specifics will depend on the outcome of the final accident.
After reading the investigation report, Li Dan's face was livid, her hands were shaking, and she was so angry that she walked back and forth in the control room, not knowing how to vent her anger.
Natsume has already directed the staff to seal the sewage that overflowed into the sedimentation tank. Now apart from the frightened staff, there are only two girls, Li Dan and Shimizu Masato, left in the control room.
Masato has contacted the senior emergency engineers arranged by the Shimizu family inside the shelter. They have come up with a plan and found a new emergency pressure pump and other related maintenance components from the underground warehouse. But the problem is that a group of warriors must risk it.
Entering an area occupied by sewage at the risk of life and may be swept away by eddy currents at any time, or killed by electric shock due to leakage in the underlying pipeline network, repair the damaged pressure pump and install a new pressure pump at the same time.
As a special agent of the First Central Axis, Li Dan could stay out of the matter, but the sense of justice in her heart prevented her from sitting idly by, so she sent a request for help to the First Central Axis in her own name.
Soon, the emergency team on the first central axis came up with a new plan.
That is to double the number of staff required by the previous plan of the Shimizu family team, then completely cut off the power to the purification area, and at the same time open the sewage outlet to drain all kinds of existing water bodies inside the shelter 30.
The advantage of this is that it reduces the risk of installation, but it also lengthens the time to resolve this accident. After all, when the water body inside the shelter is in a circulating state, it can meet the normal operation of the overall shelter. Once the total water volume is regarded as pure
If the wastewater is discharged into the ground, the shelter will need to obtain water from other sources to replenish it.
This kind of supplement seems simple, but after the sun disappears, not only the surface turns into a world of ice and snow, but even the utilization of shallow groundwater becomes very difficult.
This reminds people of a cruel reality that seems to be a joke, that is, there are two places in the world that are most water-scarce! One is the desert, and the other is the continent of Antarctica!
Some people may say, you are funny! The continent of Antarctica is full of ice, how can it be short of water?
Yes, the Antarctic continent is not short of ice, but ice needs a lot of heat to turn into water. Now it only takes about an hour for the shelter to drain 30% of the total existing circulating water, but it is possible to replenish this 30%.
It will take more than a month, and will also consume a lot of energy in the shelter.
So, now is the time to make a choice.
The emergency team arranged by the Qingshui family in Xiongan No. 1 shelter consists of 375 people, including 90 purely technical personnel, and the rest are warriors who have signed life and death certificates. But according to the Qingshui family emergency team
According to the plan given, this "battle" requires at least 1,500 people to be invested, which means that even if the Qingshui family's emergency team is fully deployed, there will still be a gap of more than 1,200 people.
And these 1,200 people are not
Anyone can do it. They must be young and strong men, and do not have claustrophobia or other symptoms. They must also obey orders and follow arrangements. Their execution ability must be strong enough, and they must be able to operate without any auxiliary equipment.
Carry out diving operations below.
Once such a request was made, the original plan of the senior officials to mobilize manpower directly from the troops stationed in the refuge was shattered.
If the modified plan given by the First Central Axis combined with the Qingshui Family emergency plan is followed, at least 3,000 people will need to enter the sedimentation area to operate simultaneously, but the advantage is that drainage can effectively slow down the overflow problem of the sedimentation tank, and this hour
It also gave senior management a certain amount of breathing time.
We have countermeasures, but the specific decision-making depends on the top management.
Masato Shimizu stood at the door of the control room with a gloomy face. There was already a shallow layer of spilled sewage on the ground under his feet, and rescue personnel were still stationed. Now if a new problem occurs, it will inevitably cause a large number of casualties.
, this is what Masato Qingmizu doesn’t want to see.
Li Dan is also worried now. Of course, she is more worried about Natsume's safety.
Natsume, who was on the front line, was setting up blocking devices with more than a dozen patrolmen. There were not many of these emergency flood-fighting equipments, so they were all used at the front.
Facing the stinking sewage with white foam, Natsume gritted his teeth and shouted, "Don't retreat! Hold on!"
Everyone roared "Hey!" in unison, leaning forward and pressing their arms against the blocking device, turning themselves into wooden stakes.
Worried about Natsume, Li Dan finally ran to the front. When she saw Natsume and others using manpower to fight against more and more sewage, she shouted, "Natsume! Don't resist! The water will come up later.
You can’t escape like this!”
Natsume didn't move. He shouted angrily at Li Dan behind him, "I told you to stay in the control room, why did you come here again! Ah? You are crazy!"
Li Dan stepped on the sewage and ran to Natsume. She wiped the mud on Natsume's face with a scarf and said, "Don't always yell at me! You treated me like a child when I was in school! I'm grown up now."
Now! You can take care of yourself!”
Natsume laughed angrily. He saw that the gap at the connection point of the blocking device was beginning to leak, and said to his subordinates, "Pay attention, there should be a wave coming. Push it over, and then retreat to the next line of defense!"
"yes!"
wave?
Will there be waves in the water gushing out of the cesspool?
Of course. The biggest feature of the sedimentation purification method used in Xiongan No. 1 Shelter is that the reservoir is large enough and has enough sedimentation volume at one time. In order to ensure smooth cleaning of the sediment at the bottom of the sedimentation tank, the bottom of the tank is pre-installed.
Well, the gravity-driven distributor is a bit like the principle of a waterwheel. It does not require power from a transmission shaft. As long as the amount of sediment reaches a certain level, it will automatically rotate and push the sediment with the help of the overall potential energy of the water body.
into a special cleaning pool.
Therefore, waves will also be generated in the sedimentation tank, and they are big waves that may not seem surprising but are powerful!
Li Dan didn't know the specific structure of the sedimentation tank and thought it was a wave formed by the sewage vortex, so he and Natsume resisted the flood control blocker together. Natsume's face changed when he saw this and said, "Hey! What are you doing! Go away! You can't resist it."
of!"
Li Dan lost her temper. She rolled her eyes at Natsume and said, "I want you to take care of it! If you don't leave! I won't leave either!"
"Hey! You!" Natsume was about to say something, when the undercurrent waves hit the flood control blocker in the channel.
At that time, Natsume felt that her arms were numb and her feet were slipping.
The next second, the overwhelming stench of sewage swept his and Li Dan's bodies into it.
The blocker was torn apart instantly, and a "rumbling" roar of sewage came from the channel. The eyelids of the staff on the second line of defense twitched, but under the supervision of the command staff, no one retreated. After all, the last line of defense was behind them.
If the sewage cannot be blocked here, there will be no time to remedy it.
Water is definitely the most amazing thing in the world. When it is calm, it is so gentle, but when it surges, it is so violent and ruthless.
Water accumulated at one point under high pressure can cut even the hardest steel. At this moment, tens of thousands of cubic meters of sewage rushing into the channel was like a galloping horse trampling over Natsume.
By the time the sewage waves hit the winding passage several times and the lighting equipment kept flashing, the sewage reaching the second flood control line had lost its strength.
Everyone took a long breath and smiled, but the commander's face was extremely ugly. When he saw the wave of sewage receding, he immediately ordered "Save people!!!"
At this time, everyone remembered that there was a team of fifteen people in front of them. They were carrying a few flood control arresters. They should have withdrawn before the waves hit the second flood control line, but now the water has receded.
, but they disappeared.
At that time, more than 20 people poured into the passage and began to look for Natsume and others in the sewage.
But most of the 120-meter-long Z-shaped channel is now submerged, and the deepest part can reach an adult's neck.
It is extremely difficult to find survivors in this environment.
Just when all the rescuers were in despair, a figure swam out of the sewage.
He raised his head suddenly, holding a girl in his arms.