White smoke should be the most common smoke we have now, and many people will find that the colder the weather, the more obvious the white smoke. What the white smoke is? Why is the colder the more obvious the day? In fact, most of the white "smoke", especially in cold weather, only water vapor (and condensed droplets). The boiler feed water tank is equipped with a chimney that only emits water vapor and air. Water is one of the important by-products of combustion, so there is water vapor in the chimneys of coal, oil and natural gas boilers.

Moreover, this can also prove that the company uses environmentally friendly equipment. In order to reduce the dust pollution by the emission standard, the company will install water filtration equipment at the equipment discharge terminal. The exhaust gas of the boiler will be filtered into the water, and all the dust inside will be filtered out and then discharged to the atmosphere. in. While filtering the dust, the high heat in the exhaust gas is also absorbed by the water, and the water vapor is discharged from the chimney. When it is cold, it is the white smoke we see. This can also be a side note that the pollutants emitted by the boiler comply with national emission standards.

Careful friends should find that there are fewer and fewer black smoke emitted from the chimneys, but some small businesses and small workshops still emit a lot of black smoke. Most of these small enterprises burn the cheapest and the worst quality loose coal, and the exhaust gas generated by the combustion is directly discharged without treatment. The loose coal contains a large amount of sulfur and nitrate components, and the sulfur dioxide and nitrogen oxides formed after combustion are applied to the human body. The damage is great, so the pollution is also the biggest.

If the smoke column emitted by the chimney is yellow, the flue gas contains a large amount of sulfide, indicating that the boiler's desulfurization equipment is not put into use.

In the chemical plant, you can always see a "chimney" that is burning with flames. It burns day and night. In fact, this is not a chimney, its name is called a safety torch. In the production process, chemical plants produce many flammable and explosive gases, many of which are harmful to humans. Most of them are heavier than air. If they are placed in the atmosphere, they will spread on the ground and reach a high concentration. This will cause serious environmental pollution and endanger human health. If it encounters fire, it will cause fire and even explosion. . In order to prevent these dangers from happening, people put them together and burned them to prevent future troubles.

The torch converts these flammable, explosive, toxic, corrosive gases into harmless carbon dioxide, water or other substances that are non-toxic and less toxic. It is indeed wasteful to burn these fuels directly, so the factory is doing everything possible to recover the flare gas as a useful fuel. However, even if the recycling is thorough, the torch cannot be abolished, because in the event of an accident, it is still necessary to burn a large amount of combustible gas to ensure safety. Therefore, the torch device can be said to be the last safety barrier of the chemical plant.

Another type of tank that is mistaken for a chimney is actually a cooling tower, unless it is a fire in the cooling tower, it is a discharge of water vapor and some micro-bacteria and algae-killing drugs. The cooling tower uses the principle of water and air flow to exchange cold heat exchange to generate steam. The steam volatilizes away heat to achieve the principles of evaporative heat dissipation, convective heat transfer and radiation heat transfer to dissipate the waste heat generated in the industrial or refrigeration air conditioner to reduce the water temperature. Evaporative heat sink to ensure the normal operation of the system, so the top is water vapor.

There are two cases of basic smoke-free. One case is the installation of environmental protection facilities, and the unit is equipped with a GGH flue gas heat exchanger. The principle is to increase the exhaust gas temperature by heating, so that the flue gas discharge is higher, but it is gradually being eliminated due to the high failure rate and high investment operation cost.

In another case, environmental protection equipment is not installed, but the coal quality is good or simple dust removal treatment is carried out, but the smoke contains a large amount of sulfur dioxide and nitrogen oxides, which is much more serious than white smoke.

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