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Types and application scope of fire extinguishers

It's better to rely on yourself than on the sky and the earth
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Fire fighting knowledge is a must for everyone. Here are the types of fire extinguishers and their applications

Operation method

Dry powder extinguisher: use compressed carbon dioxide to blow out dry powder (mainly containing sodium bicarbonate) for extinguishing. The advantages of dry powder fire extinguishers are: good fluidity, high ejection rate, non corrosive containers and non perishable. In addition to putting out ordinary fires, it can also be used to put out fires caused by oil and gas combustion. Its dry powder is a kind of flowing fine powder, mainly composed of inorganic salts and some additives. Scope of application: fire fighting of petroleum, petroleum products, paints, organic solvents and electrical equipment.

Foam fire extinguisher: there are two containers in the foam fire extinguisher, respectively containing two kinds of liquids, which are aluminum sulfate and sodium bicarbonate solutions, and the two solutions do not contact each other. When we need to use a fire extinguisher, turn it upside down and mix the two solutions together to produce a large amount of carbon dioxide gas. As some foaming agents are added to the fire extinguisher, a large amount of foam will be produced. After the switch is turned on, it can be used by ejecting it. Scope of application: Class A, Class B and polar solvent fire hazard places such as ether, alcohol, ester, ketone, organic acid, heterocycle, etc. In addition, it can also be used for oil and general substance fires.

Carbon dioxide fire extinguisher: liquid carbon dioxide is stored in the fire extinguisher cylinder. When working, the handle of the cylinder valve is pressed down. The internal carbon dioxide extinguishing agent is sprayed from the siphon through the bottle valve to the spray barrel, which makes the oxygen concentration in the combustion area drop rapidly. When the carbon dioxide reaches sufficient concentration, the flame will suffocate and extinguish. At the same time, because the liquid carbon dioxide will rapidly vaporize, it will absorb a large amount of heat in a very short time, so it plays a certain role in cooling the combustor and also helps to extinguish the fire. Scope of application: It is applicable to fire fighting in places with live electrical appliances, valuables, equipment, books, instruments and instruments below 600V. It can also be used for fires under the same general conditions.

1211 fire extinguisher: generally, this kind of fire extinguisher cannot be used because its extinguishing agent destroys the ozone layer. Its principle is to use the nitrogen pressure installed in the cylinder to spray 1211 extinguishant out of the fire. It belongs to the pressure storage type I, 1211 is the code name of difluoro chloro bromomethane, and the molecular formula is CF2ClBr. 1211 fire extinguishing agent is a kind of low boiling point liquefied gas, which has the advantages of high fire extinguishing efficiency, low toxicity, low corrosivity, long storage without deterioration, no traces left after fire extinguishing, no pollution to protected objects, and good insulation performance. Scope of application: It is suitable for extinguishing flammable liquids, flammable liquids and flammable gases. Or some important occasions.

Wandering Heart 2024-01-09 17:40:13

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Top ranking generally refers to the top

Ranking top does not always refer to the top. Ranking top is an idiom in Chinese. It originally meant that when the troops of the ancient Chu State marched, if the outpost met the enemy's situation, they would give a warning. Later, "Ranking top" literally meant ranking first, describing excellent performance. Its own structure is subject predicate, which can be used as predicate, attribute and commendatory in sentences. From the Twelve Years of Zuo Zhuan Xuangong written by Zuo Qiuming in the Spring and Autumn Period: "As the ruler of the State of Chu, he chose the order and code of the State of Chu for military conduct, right shaft, and left pursuit of production. He had no foresight, power, and stamina. All officials moved like objects, and military and political affairs were not disciplined, so he could use the code."
At first sight, the idiom "Top Rank" means that Chu's army is well-trained and orderly. In fact, it reflects that Chu's morality, punishment, politics, affairs, code and etiquette are not against the rules. Such a country and army are invincible.

Emphasize sentence structure and usage

Emphasize the structure and usage of sentence patterns. For example, emphasize that sentence patterns refer to present or future situations. Use It is to refer to the past. Use It was
For example:
It is I who, that am wrong
Basic definition: The emphatic pattern is a kind of rhetoric, which is a form used by people to express their will or emotion. Emphasize a certain part of the sentence in various ways to play a rhetorical role. The commonly used emphasis structure in English is It is (was)+the stressed part (subject, object or adverbial)+who (that).... Generally speaking, when the stressed part refers to people, when the who refers to things, it uses that, but that can also refer to people. In American English, which is often used instead of that
Common sentence patterns:
1. The emphatic sentence pattern of declarative sentences:
It is, was+emphasized part (usually subject, object or adverbial)+that/who (when emphasizing subject and subject refers to person)+other parts.
It was yesterday that he met Li Ping
2. The emphatic sentence pattern of general questions:
Same as above, just mention is and was before it.
Example: Was it yesterday that he met Li Ping
3. The emphatic sentence pattern of special questions:
The emphasized part (usually interrogative pronoun or interrogative adverb)+is, was+it+that, who+other parts.
Example: When and where was it that you were born

Is Sun Jing a historical figure

Sun Jing is a historical figure, a famous statesman and strategist of the Han Dynasty, and the hero of the "hanging beam" in the idiom "hanging beam and stabbing shares".
Sun Jing was a native of Xindu (today's Jizhou District, Hengshui City) in the Han Dynasty. He was eager to learn at a young age, learned extensively and memorized well, and regarded books as his life. Reading and studying at night often stay up all night. The neighbors called him "Mr. Closer".
When Sun Jing was reading, he kept taking notes at any time. He often saw it in the second half of the night. As time went by, he sometimes fell asleep. When I woke up, I felt regretful again. One day, when he looked up and pondered, his eyes stopped on the beam of the room, and suddenly his eyes lit up. Then he found a rope, one end of which was tied to the beam, and the lower end was tied to his hair. In this way, whenever he is tired and sleepy and wants to doze off, as long as his head is lowered, the rope will suddenly pull his hair, and a pain will wake him up and drive away the drowsiness. From then on, he used this method to study hard every night. Years of hard work enabled Sun Jing to read poetry and become a knowledgeable scholar. At that time, he was quite famous north of the Yangtze River and Huaihe River, and students from thousands of miles often came to him to learn and discuss knowledge.

Does the temperature rise with the increase of internal energy

When the internal energy of the object increases, the temperature does not necessarily increase. The size of internal energy is related to the mass, volume, temperature of the object and the kind of substances that make up the object. For example, when the crystal melts or the liquid boils, the temperature remains the same, but it needs to absorb heat and the internal energy increases.
In general physical problems (not involving the excited ionization of electrons, chemical reaction and nuclear reaction), only the molecular kinetic energy and potential energy will change in the internal energy. At this time, we only care about these two parts, and define the sum of these two parts as internal energy. This is a simplified definition, namely internal energy in a narrow sense. When it comes to excited ionization of electrons, chemical reaction and nuclear reaction, in order not to cause misunderstanding, internal energy in the narrow sense should be strictly called thermodynamic energy (formerly called heat energy, which is still widely used in some engineering fields).
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