strictlysupreme Chapter 607: The Principles, Advantages And Disadvantages And Construction Principles Of Hydraulic B
Chapter 607: The Principles, Advantages And Disadvantages And Construction Principles Of Hydraulic B
In the [Daming First Biogas Tank College], most of the original school buildings in the college have been demolished and replaced by model houses built to imitate ordinary people's families.
After all, it is a biogas digester that is intended to be used in ordinary people's households, so it must be built based on ordinary people's households.
Yan Changqing stood in front of the model houses of common people's residences. In front of him was a small podium. Behind him were several large mobile blackboards, and in his hand was a small podium. A piece of chalk.
As for the princes Zhu Biao, Zhu Xi, Zhu Fan, Zhu Di and other princes, Xinguo Gong Tang He, imperial physician Wang Lu, as well as the magistrate of Haizhou City and a group of local officials in Haizhou City, the dean of the old academy who was watching, As well as many students from the original academy.
He was sitting in front of a desk with a brush in his hand and a white paper on the table, ready to record what Yan Changqing said.
"Biogas digesters are mainly divided into three types, namely fixed arch cover hydraulic biogas digesters, modified hydraulic pressure biogas digesters, and no movable cover bottom-discharge hydraulic pressure biogas digesters."
“Today we are mainly talking about the fixed arch cover hydraulic biogas digester!”
"As for the fixed arch cover hydraulic biogas pool, there are three pool types: cylindrical, spherical and ellipsoid."
"Although there are differences among these three pool types, they are not very different. We mainly choose different pool types based on the actual situation." 17
“The reason why it is called a hydraulic biogas pool is because the upper air chamber of these biogas pools is completely closed. As the biogas continues to be generated, the pressure of the biogas increases accordingly.
"This continuously increasing air pressure forces part of the feed liquid in the biogas pool to enter the water pressure chamber connected to the tank body, causing the liquid level in the water pressure chamber to rise."
“In this way, there is a water level difference between the liquid level in the water pressure chamber and the liquid level in the biogas tank. This water level difference is called ‘water pressure’.
"When using biogas, turn on the biogas switch and the biogas will be discharged under water pressure."
"When the biogas decreases, the liquid in the water pressure chamber returns to the inside of the pool, causing the water level difference to continue to decrease, resulting in a corresponding decrease in the biogas pressure."
"This type of pool that uses part of the feed liquid to move back and forth, causing repeated changes in water pressure to store and discharge biogas, is called a hydraulic biogas pool.
As Yan Changqing spoke, he drew two-dimensional diagrams showing the operating principles of the hydraulic biogas digester on the blackboard behind him.
The princes Zhu Biao, Zhu Xi, Zhu Fan, Zhu Di and other princes below believed in the Duke Tang He and the imperial physician Wang Lu.
As well as the magistrate of Haizhou City, local officials and other personnel in Haizhou City, as well as the dean of the old academy and students of the original academy who were observing, they all copied and memorized it by hand.
Yan Changqing on the podium also continued to talk about the various advantages and disadvantages of hydraulic biogas digesters:
"This hydraulic biogas digester has the following benefits."
“First, the pool structure has good stress performance and makes full use of the soil’s bearing capacity, so it saves labor and materials, and the cost is relatively low.
"Second, it is suitable for filling a variety of fermentation raw materials, especially a large amount of crop straw, which is very beneficial to fertilizer accumulation in rural areas."
“Third, in order to facilitate frequent feeding, toilets and pig pens can be built on top of the biogas pool, and feces can be swept into the pool at any time.
"Fourth, the surrounding area of the biogas pool is in contact with the soil, which also plays a certain role in the insulation of the pool body."
"But again, there are several disadvantages to hydraulic digesters, for example."
“First, due to repeated changes in air pressure, it has certain adverse effects on the strength of the pool and the stability and improvement of the combustion efficiency of lamps and stoves.
"Second, since there is no stirring device, the scum in the pool is easy to crust and difficult to break."
"So the utilization rate of fermentation raw materials is not high, and the gas production rate of the pool volume (that is, the amount of gas produced per cubic meter of pool volume per day and night) is low. The general gas production rate is only about 0.15 m3/m3 per day."
"Third, because the diameter of the movable cover cannot be enlarged, it is more difficult for biogas digesters whose fermentation raw materials are mainly straw."
"Therefore, it is best to use a certain discharging machinery to assist in discharging materials."
Yan Changqing held chalk in his hand and wrote quickly on the large mobile blackboard. In a short time, a large area was filled with dense writing.
And with the same number of written words, the writing speed of chalk calligraphy is absolutely faster than the writing speed of calligraphy.
After all, there is a whole piece of chalk, and he doesn't have to stop until he finishes writing.
As for the brush, you have to dip it in ink from time to time, even if you dip it in too much or too little ink.
If there is too much ink, the brush will easily turn into a puddle of ink when it falls on the paper.
If there is less ink, the brush will not be able to write many words when it falls on the paper.
So when Yan Changqing took the chalk and finished writing on the blackboard, the people below could only barely finish copying one-third to one-half of the blackboard.
At this time, the princes Zhu Biao, Zhu Xi, Zhu Fan, Zhu Di and other princes, as well as the Duke Tang He and the imperial physician Wang Lu, had given up copying.
After all, they couldn't keep up with Yan Changqing's writing speed, so they might as well listen carefully first, and then ask Haizhou Prefecture Zhizhou and others for a copy of the copied notes later.
As for the magistrate of Haizhou City, a group of local officials and other personnel in Haizhou City, as well as the dean of the old academy and a group of students from the original academy who were observing.
They didn't dare to ask Yan Changqing to accommodate their speed, so they could only wait and keep up with Yan Changqing's writing and speaking speed.
Someone copied a little faster and accidentally splashed a trace of ink on his front. He didn't even bother to wipe it off. He still just took the time to copy and record the writing on the blackboard.
However, this situation did not last long before Yan Changqing discovered it on the podium, and then slowed down and said warmly:
"Don't worry, the writing on the blackboard will not be erased. It won't be too late for you to copy the writing on the blackboard later. Now, the main thing is to listen carefully and understand.
As soon as these words came out, the governor of Haizhou City and all the local officials and other personnel in Haizhou City, as well as the dean of the old academy and the students of the original academy who were listening, all felt a warm current rushing through their hearts, and they couldn't help but join in. He stood up, bowed and saluted and said gratefully:
“Thank you Saint for your accommodation!!!”
Yan Changqing shook his head, indicating that this was not necessary, and then continued:
"During the construction process of biogas digesters, the following three principles need to be followed."
"The first principle is the 'three combinations' principle!"
"The so-called 'three combinations' means that the biogas tank is connected to the livestock pen and toilet, so that human and animal feces continue to enter the biogas tank, ensuring normal and continuous gas production, and is conducive to feces management and improving environmental sanitation."
"The second principle is the principle of roundness, smallness and shallowness!"
“The so-called ‘round’ means that the pool shape is mainly cylindrical, with a pool capacity of 6 to 12 cubic meters and a pool depth of about 2 meters.
The 453" circular biogas digester has the following advantages: First, according to the principle of geometry, the surface area of a circular biogas digester of the same volume is smaller than that of a square or rectangular one, and it saves more materials.
"Second, it has good sealing and is relatively strong; the internal structure of the circular pool is reasonable, and the pool wall has no right angles, which is easy to solve the sealing problem, and the force is evenly distributed around it, making the pool body stronger." 1
"Third, the temperature in the north of the Ming Dynasty is low, and the circular pool is placed underground, which is conducive to winter insulation and safe overwintering."
"Fourth, it is suitable for promotion. Regardless of the south or the north, building a circular biogas pool is conducive to ensuring the quality of the pool construction. It is possible to build one, succeed in one, use one, and consolidate one, so as to actively and steadily popularize it. ”
"The so-called 'small' means that the volume of the main pool should not be too large."
"The so-called 'shallow' is to reduce the depth of excavation and avoid underground water. At the same time, the surface area of the fermentation liquid is relatively expanded, which is conducive to gas production and fertilizer production."
"This is the principle of 'round, small and shallow'!!!"
“The third principle is, ‘Adhere to the principle of separating incoming and outgoing materials’!”
"The purpose of straight tube feeding is to make the feeding smooth and facilitate mixing."
"The grate is added to the feed inlet to prevent pigs from falling into the feed pipe of the biogas digester, and the outlet is covered to maintain environmental hygiene, eliminate mosquito and fly breeding sites, and prevent people and livestock from falling into the pool."
“The above are the construction principles that should be followed when building a biogas digester!!!”
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