In addition to flammable gases, can flour and pulverized coal also explode?

Yes....It is enough to emit into the air like a gas, but also be flammable...The local volume fraction is in the range of 4% to 74%.

The dust that cannot occur is raw stone powder.

Dust**, refers to the combustible dust within the limit range, encountering a heat source (open flame or high temperature), the flame instantly spreads in the entire mixed dust space, the chemical reaction speed is extremely fast, and a large amount of heat is released at the same time, forming a very high temperature and a lot of pressure, the energy of the system is converted into mechanical energy and light and heat radiation, which has a strong destructive force.

Dust is mostly in the production and processing sites accompanied by aluminum powder, zinc powder, aluminum processing and grinding powder, various plastic powders, intermediates of organic synthetic drugs, wheat flour, sugar, sawdust, dyes, bakelite ash, milk powder, tea powder, tobacco powder, coal dust, plant fiber dust, etc.

Characteristics of dust**.

1. Multiple times**. The first air wave will blow up the dust deposited on the equipment or the ground, and in a short period of time, negative pressure will be formed in the central area, and the surrounding fresh air will be filled in from the outside to the inside, mixed with the dust raised, thus triggering the second time. Second, the dust concentration will be higher.

2. The minimum ignition energy required for dust ** is high, generally more than tens of millijoules.

3. Compared with flammable gas, the pressure of dust rises slowly, the higher pressure lasts for a long time, the energy released is large, and the destructive force is strong.

The dust that cannot be burned cannot be burned.

All flammable gases, vapors of flammable liquids, and combustible dusts can occur when they ignite in the air, and each flammable substance has a certain limit. For example, the mixture of hydrogen and oxygen, the mixture of carbon monoxide and oxygen, etc., can occur after ignition**.

If the concentration of flammable gases, vapors of flammable liquids and combustible dust in the air is lower or higher than the ** limit, when ignited, it will generally not cause ** phenomenon.

Is flour dust physical or chemical? In fact, flour dust is a chemical reaction.

In the TV series "The Pretender", we saw a scene where in order to destroy all the unfavorable evidence in the flour mill operated by Mingtai, Mingcheng and Minglou used a large amount of flour to create a dusty environment, and then ignited it to cause violent **. This is the most straightforward demonstration of flour**.

One of the conditions for dust ** is combustible dust particles, flour belongs to starch composed of glucose molecules, glucose is burned and decomposed into carbon dioxide and water, while coffee powder is composed of sugar, fat, protein and some carbohydrates, which also belong to combustible particles. These combustible dust particles reach a certain concentration in the air and will occur when exposed to an open flame**, which is dust**.

In specific environments such as confined spaces, if particles of flammable substances such as flour, coal dust, and aluminum powder reach a certain concentration in the air, they will encounter open flames or high temperatures, and dust will be generated**. This situation mostly occurs in industrial sites that are prone to dust, such as mines and flour mills. Therefore, care must be taken to avoid open flames in these places.

The 2014 Kunshan dust** incident killed 146 people and injured 91. The reason for this accident was that the dust was not cleaned up in the workshop for a long time, resulting in the accumulation of aluminum powder on the ground, and when the fan of the dust removal system was turned on, a large amount of aluminum powder was blown up and encountered the high-temperature particles of the grinder and ignited directly**. Mixing fine aluminium powder with air can form a mixed ** substance, which can be ignited when the concentration in the air reaches 40 milligrams of cubic meters.

Fire experts pointed out that there are three conditions for dust: first, combustible dust floats in the air at the concentration released; second, there is sufficient oxidant and air; Third, there is an ignition source or strong vibration or friction. How can we prevent and avoid dust**?

The first is to strengthen ventilation; the second is to put an end to fire; The third is to do regular inspections to eliminate hidden dangers.

This kind of ** belongs to physics**, because flour dust** does not produce new substances, and what does not produce new substances is physics**.

Flour dust should be chemical because there is a chemical reaction, which is also mentioned in chemistry books.

It belongs to physics, if there is too much dust in the production space, and the concentration reaches a certain value, it will be produced when it encounters an open flame. So it belongs to physics**.

Conditions for pulverized coal: 1. The concentration of pulverized coal reaches the limit; 2. The flammable substances are highly dispersed, which is a prerequisite for the occurrence of **; 3. The gas can reach the height of explosion; 4. There are ignition sources, such as spontaneous combustion of pulverized coal, excessive heat of drying gas, etc.

Conditions for pulverized coal**

1. The concentration of pulverized coal reaches the highest limit

The concentration of pulverized coal in the gas is within the limit range, and it is generally believed that the maximum range of the concentration of pulverized coal in the gas mixture under standard conditions is 150 1500g m. When the fineness of pulverized coal is 10% 15 of 4900 holes, the concentration range below the lower limit of ** limit is 0 15g m.

2. Flammable substances are highly dispersed

Pulverized coal is highly dispersed, when the pulverized coal is suspended in the air, it is mixed with the air filled with hail and excavated, and the contact is good, once ignited, the combustion can spread rapidly, which is the prerequisite for the occurrence of the explosion.

3. The gas can reach the height of explosion;

The oxygen content in the gas mixture reaches the level where it is sufficient to occur, and the oxygen content in the gas should be controlled below 14%, otherwise it is easy to occur. Reducing the oxygen content can increase the lower limit and lower the upper limit of the limit, thereby narrowing the limit range and improving the safety of the pulverized coal preparation system.

4. The existence of a fire source

There is an ignition source, and there is sufficient heat energy in the environment to ignite, such as spontaneous combustion of pulverized coal, excessive heat of drying gas, overheating of machine parts, electric sparks of electrical equipment, static electricity, etc.

Combustible dusts such as flour occur** because of their fast-burning properties.

Combustible dust such as flour, fine particles, huge surface area, can be suspended in the air for a long time, once it encounters high temperature or open flame, it can be quickly burned, releasing a lot of heat, and at the same time producing a large amount of gas carbon dioxide and water vapor, while causing rapid expansion of air, thus triggering **.

Because flour dust is a flammable substance, when ground into relatively small particles, the contact area with air will increase, so when the concentration reaches a certain standard, it will cause **.

Because the burning degree of flour is very high, and flour is very easy to occur, and flour is a solid substance, so we must look at it rationally.

Friends who have watched the TV series "The Pretender" should still remember the clip of the fried flour mill, right? In order to destroy the evidence, Ah Cheng blew up the flour mill. However, instead of using explosives or gasoline, he just ripped through a few bags of flour and sprinkled it into the air.

Then throw the lit lighter into the flour.

Boom! Flour Mill**!

Why does dust **?

The dust is within the limit range, when it encounters an open flame or high temperature, the flame instantly spreads in the entire mixed dust space, and the chemical reaction speed is extremely fast, and a large amount of heat is released at the same time, forming high temperature and high pressure. In this process, there will be a continuous increase in pressure to produce shock waves, therefore, the destructive power of dust ** is also very large.

Dust is essentially a violent redox reaction, through the oxygen in the air as an oxidant, flammable dust as a reducing agent, in a relatively closed environment, especially in some factory workshops, when their concentration is between the lower limit and the upper limit, there will be a risk of **, if there is an open flame, equipment release arc, electrostatic discharge, and even sparks generated by friction, will make the flammable dust and oxygen contact with a violent redox reaction, thereby triggering dust.

In addition to the condition of reaching a certain concentration, there is another reason for the occurrence of dust** is that they are small in size and have a large surface area, and when the surface area is increased and the contact area increases, the reaction will become more rapid.

There is a premise for flour to produce ** effect, when the flour concentration in the air reaches the standard, the oxygen is sufficient, the flour will occur, if the concentration is not reached, the flour will not occur. When the condition contains flour per cubic meter of air, when it encounters a fire source, dry flour will have a ** effect.

(1) Flour will happen**!

2) Flour in the air will happen when it encounters an open flame**!

3) Fireworks are strictly prohibited in flour mills

No, it won't. You're mistaken, it's not this fan.

Yes, there was an accident in China one year. In the flour production workshop, the scattered flour is piled up in a corner, which must be cleaned up in time, and when the limit is reached, the static spark occurs immediately, and the power is also very great, so the flour production workshop must do anti-static treatment, clean up the scattered flour in time, and prevent the occurrence of the first can not.

Flour is flammable and explosive. For example, open flames are prohibited in flour mills.

Here's how it works:

Flour itself is flammable and contains elements C, H, and O. Since the flour is small and granular, in the dry state, once it encounters an open flame, it is easy to fully contact with oxygen, and at this time, its flammability will be exerted to the extreme. There is a large amount of oxygen around each small particle of flour to support combustion, and in an instant, the heat cannot be released quickly, and it will be produced.

This is similar to the principle of gas **. When gas enters the air, it is also in full contact with oxygen, and if it burns in case of open flame, the heat cannot be released in an instant, which causes **.

Depending on the state you are in, under normal circumstances, it will not burn when placed in a bag**.

However, when dispersed into the air, due to the large contact area with the air, it will encounter an open flame.

That's why open flames are forbidden in flour mills.

Flour floating in the air is explosive and flammable. Otherwise not.

Yes, open flames and smoking are forbidden in the flour mill, otherwise it is easy**.

All organic particles can occur in the air**, and flour is one of its species.

Dry, explosive when mixed with air.

Yes, there is often news of which flour mill **.

Does flour dust**? This is a common question. In fact, flour dust** is possible.

First of all, Bu Xun needs to understand what dust is**. It is caused by the ignition source after the combustible dust forms a certain concentration with the air**. Dust** is often caused by the accumulation of dust and the surrounding air encountering ignition sources such as static electricity, sparks, or high temperatures.

Secondly, dust** is not limited to industrial fields such as chemical plants, and everyday foods such as flour can also cause dust**. When the flour is poured out, a fine layer of powder forms on its surface, which can happen if it encounters an ignition source.

Therefore, in order to prevent flour dust**, we can take the following measures: keep the flour dry and avoid moisture; Pay attention to fire and explosion prevention during operation to reduce dust scattering; Strengthen anti-static measures to avoid static sparks, etc.

Although flour dust is possible, by taking precautions, we can reduce the risk of occurrence and make our lives safer.

It is highly likely to occur when pulverized coal is exposed to a fire source**. In fact, pulverized coal is one of the deadliest and most devastating disasters in industry. Pulverized coal usually occurs in industries such as coal mining, petrochemical, and powder coating, all of which produce large amounts of coal dust and other dust.

Therefore, these hazardous substances must be strictly controlled and disposed of to ensure the safety of workers and the environment.

The principle of pulverized coal is that pulverized coal forms a flammable mixture in the air, which occurs when the mixture reaches a certain concentration and encounters an ignition source. It releases a large amount of energy, producing high temperatures, high pressures, and harmful gases, causing serious damage to equipment and buildings, and causing great harm to people and even the entire community.

In order to prevent pulverized coal**, a series of measures must be taken. First, dust generation and diffusion must be controlled, which can be achieved through the use of dust suppressants, wet cleaning, and air filters. Second, it is important to control the source of burning, which can be achieved by regularly inspecting and maintaining equipment, using explosion-proof appliances, and keeping the workplace clean.

In addition, training and education programs must be implemented to increase workers' awareness and awareness of pulverized coal and dust control.

Overall, pulverized coal is an extremely dangerous phenomenon, but the risk of its occurrence can be minimized by taking proper precautions. We must remain vigilant and take all necessary actions to ensure the safety of workers and environmental molders.