Thousand Years' Scientific Problems Behind the Fire of Foot Xintang in Taizhou, Zhejiang Province

Recently, the "roof of Taizhou Xin Tong foot foot center" 2.5 "major fire accident investigation report" hot baked, immediately spread throughout the micro-channel world. The full text is 12560 words, including 310 words about the direct cause of the accident . In other words, the truth is only about 2.5% . There is a problem of understanding in this 2.5% "truth". Why do you say that? Because I saw the sentence "Khan steaming room laying bamboo, wood keel and other combustible materials, after long-term baking of the various components of the material is very dry, burning rapidly, a short time to form a flash fire." Looks very natural and reasonable, ? No, this is a typical "overheated wood" or "self-ignition carbon" problem. It has a thousand-year history and 200 years of research history. It has not been resolved until now. We are very surprised.

(Some people say that the main problem is not the problem of overheating wood. It is a standard for electrical film products and electrical wiring. In fact, everything should be pursued for internal causes rather than external factors.)

Around the beginning of the 19th century, insurance practitioners in Europe noticed that some boilers and fuels near steam plants are particularly easy to light.

There were dozens of researchers (mainly Germans) before and after studying this issue.

The standard statement of this problem is: Under long-term low-temperature heating conditions, the ignition point of certain wood will be significantly reduced.

In general, the ignition temperature of wooden fuel is more than 200 degrees, and the so-called "overheated wood" (usually periodically heated and cooled wood) has an ignition temperature below 100 degrees.

At about the beginning of the 20th century, the insurance industry's firefighting manual clearly indicated that if there were long-term heat sources in the area, special fire prevention measures would be required.

Generally, the maximum allowable temperature of this fire wood is (presumably) 75C , otherwise there is a danger of fire. The difference between the two is so great that people have given this long-term heat-treated fuel a special name: Pyrophoric Carbon , which is characterized by long-term low-temperature heating of wood. Although it is not ignited, its ignition point is very low. As it is easy to light.

The insurance company cannot control the heat source that causes long-term heating of wood, but has to control the temperature that the latter can contact. This is the origin of all the insurance materials for “overheated wood” and it is forbidden to touch the temperature regulation above 75 degrees.

If the reformer of the electric heating device of Zhejiang Foot State's Zhu Xin Tang knew this experience, he would not dare install a high-risk power supply near the “overheated wood”.

In doing so, catastrophes are unavoidable, and the difference in results is only a matter of death and death. Therefore, the core of the problem is that this is scientific knowledge that even relevant experts do not understand. Can we use it to convict the parties?

It has been nearly a hundred years since the insurance companies implemented this rule, but the issue of the ignition theory has not been solved. In 1997, Professor Pagani (Patrick Pagni) University of California at Berkeley to enable students Kuqi Luo (Bernard Cuzzillo) on spontaneous combustion of carbon (with the original Latin root an elegant name Pyrophoria, as we use classical Chinese to name Enthalpy as for the entropy), we reviewed 100 studies over the years, and make a point of change of physical properties, to resolve outstanding ignition problems.

After the publication of their research results, another expert in the field of ignition, Vyto Babrauskas , strongly disagreed that the pyrophoric carbon phenomenon is not a physical phenomenon (physical properties are physical phenomena) but chemical phenomena (wood degeneration, Involving unquantifiable chemical processes), and then started an academic debate, and ultimately there is no definitive conclusion.

The latter point of view is that long-term heating of wood undergoes changes in chemical properties, and therefore it is more prone to internal auto-ignition.

The former point of view is that long-term heating of wood causes physical characteristics to change, so that the heat transfer efficiency at the time of ignition is increased, resulting in easier ignition.

The former's view seems more reasonable, but his experiments cannot be heated for years and months, so it is impossible to simulate the physical properties of “self-ignition carbon”. This is the biggest handle of Pagani’s theory and it is not captured by Bab Raxkis. put.

However, besides complicating the issue, he did not propose a better solution.

Now, there is only one way to deal with this problem. That is to limit the contact temperature of “overheated wood” or “self-ignition carbon” and must not exceed 75C .

Asking academic questions to ask firefighters is too high, but how to avoid the phenomenon of spontaneous combustion of carbon, which is the common sense of insurance companies, has been nearly 100 years old.

In China, this lesson has at least 985 years of history. Do not believe, please look at the disaster in the Song Dynasty.

Song Renzong Ming Dynasty (AD 1032 ). It is the night, Daehnei Fire, and the three halls of Chongde, Changchun, Zifu, Huiqing, Chonghui, Tianhe, Chengming and Yanqing. Emperor and Empress Dowager refuge from the fire court; The wording of the fire in the “Mirror of Mirrors” was: When the time blasphemer had placed a prison on a fire, he had to sew and smash people's fire. Cheng Linfu, the matter of Cheng Zhilin’s identification, was the place where the fate of the fate of the fate of the fire had passed and he said: “The harem is full of people and the people are living in it. They’re ? 罱 灞冢 灞冢 灞冢 昃 昃 昃 昃 昃 伲 伲 伲 舜 舜 煸 煸 煸 ? ? 灰 灰 灰The government of Shih Yixing, who monitors the governor Yixing Jiangtang, also said: "The fire has not been traced. Is it safe to know God? His Majesty, Yi Xi De strain, wants to be attributed to the palace man. When a palace man pays a prison, he must not ask for it, but the death given by him is a heavy contingency. "The emperor (Song Renzong, really house-hearted ah) to widen his prison, the death of the dead.

see it? Cheng Lin, the founder of the Kaifeng Mansion in the Song Dynasty, had a scientific mind and a logic of reasoning. It was inferred from the spread of the fire that the fire came from the kitchen. The key reason was that it was “dry and burn for a long time” (it was a typical overheating phenomenon). ) Therefore, it is proposed that "this plague of natural disasters should not be a sinner."

The information in this article comes from the Internet and was reorganized and edited by China Rescue Equipment Network.