Where does dust pollution come from?

The deterioration of the environment is not only the traditional soil erosion and desertification, but also the marine pollution, global warming, and El Niño have become major problems in the 21st century, and dust pollution is one of the most serious problems. Dust pollution is by no means a trivial matter, it directly threatens people's lives, especially in the dust polluted environment will cause a variety of cardiovascular and respiratory diseases.

With the passage of time, we have entered the 21st century, a science and technology and achievements have been unveiled, science and technology is developing rapidly, but the development of the 21st century has long been far more than the development of science and technology, an increasingly serious, more prominent problem is quietly rising; Deterioration of the environment. The rapid increase in the incidence of asthma and bronchitis this year is a typical manifestation of the aggravation of dust pollution, which has the greatest impact on the elderly and children. Moreover, excessive dust is easy to breed germs and viruses, which is extremely bad for health.

It will also be extremely harmful to health.

Within 8 hours, when the average dust concentration in the workshop is lower than 1 (milligram cubic meter), it is harmless to the human body, the concentration is in the range of 1 3 (milligram cubic meter), there is a certain hazard, when it is higher than 3 (milligram cubic meter), there is greater harm, the maximum allowable value is 10 (milligram cubic meter), at present, in fact, most of the woodworking workshop, artificial stone workshop can not meet this requirement.

Dust does not directly hurt people, but it can cause great harm to organs such as the respiratory tract and eyes. Dust with a particle size greater than 10 microns stays in the air for a short time, and can be effectively trapped in the respiratory tract during respiration and does not enter the alveoli, but because wood dust contains wood tar, this substance is composed of various phenols and hydrocarbons, and contains carcinogenic substances, in the long run, workers will be partially suffering from bronchitis, asthma and emphysema, etc., and even carcinogenic. Wood flour with a particle size of less than 10 microns will directly enter the human lung tissue and precipitate in the alveoli, which may cause chronic fibrosis of the lung tissue, and even lead to a series of pathologies such as pulmonary heart disease and cardiovascular disease.

Moreover, these inhalable substances can also carry a variety of pollutants or germs into the lungs, which is very harmful to the human body. If dust bounces into or flies into a person's eye, it can cause injury and affect normal operation. In addition, wood dust is also one of the most dangerous flammable items, which is easy to cause disasters.

In addition, suspended dust will increase the abnormal wear and tear of production equipment, shorten the life of equipment, and increase maintenance costs, thus having an impact on the output and economic benefits of enterprises that cannot be underestimated.

One: It is caused by human activities.

Two: It is caused by natural processes.

The latter includes various types of dust caused by volcanic eruptions, forest fires, thunder and lightning, etc. At present, human beings cannot fully control the pollution of the atmosphere caused by natural processes, but these natural processes are mostly occasional and regional, and the two same processes often occur for a long time. Because the natural environment has a certain capacity and self-purification energy, the dust pollution caused by the natural process will automatically disappear after a period of time, and there is no fundamental harm to the development of the whole human being.

The chemical composition of dust is the main factor that determines whether dust is harmful to the human body.

In the "Classification Catalogue of Occupational Disease Hazard Factors", there are 52 kinds of dust (including 1 open clause), but in actual production activities, the types of dust are not only a single dust, but also a mixture of multiple dusts, which is more complex. Different dust has different harm to the human body.

In addition to pneumoconiosis, the damage caused by dust can also cause poisoning, bacterial infection, radiation sickness and other diseases, that is to say, the impact of dust on the human body, in addition to physical damage, can also cause chemical injury, biological injury, radiation injury, etc.

The harm of dust to the human body.

1. Destroy the normal defense function of the human body.

2. It can cause lung diseases. Long-term inhalation of a large amount of dust can cause diffuse and progressive fibrous tissue proliferation in lung tissue, causing pneumoconiosis, resulting in serious impairment of respiratory function and loss of working ability. Silicosis is the most severe, fastest-progressing, and most harmful pneumoconiosis with fibrotic lesions.

3. Carcinogenic. Some dusts are carcinogenic, such as asbestos is recognized as a human carcinogen in the world, asbestos dust can cause mesothelioma, which can significantly increase the incidence of lung cancer.

Answer] Trace: the production, transportation, molding, and packaging process of powdered materials; crushing process of solid materials; the process of smelting and welding of metallic substances; The substance burns the first minute and the heating process.

The chemical properties and chemical composition of dust are the main factors that determine the biological role of dust.

Dust pollutes the atmosphere and endangers human health. Dust wafting in the atmosphere often contains many toxic components, such as chromium, manganese, cadmium, lead, mercury, arsenic, etc. When the human body inhales dust, particles smaller than 5 m can easily penetrate deep into the lungs, causing toxic pneumonia or silicosis, and sometimes lung cancer.

Once the pollutants deposited in the lungs are dissolved, they will directly invade the bloodstream, causing blood poisoning, and the undissolved pollutants may also be absorbed by the cells, leading to the destruction of cell structure. In addition, dust can contaminate buildings, exposing valuable ancient buildings to corrosion. Dust that falls on the leaves of plants can hinder photosynthesis and inhibit its growth.

Dust, like other substances, has a certain amount of energy. Due to the small particle size and large surface area of the dust, its surface energy also increases. The surface area of a 1g piece of coal is only 5 6C, and the surface area of 1g of coal dust can reach 2.

Dust mixed with air, can form a combustible mixed gas, if it encounters an open flame or a high-temperature object, it is easy to catch fire, complete the combustion process in an instant, release a large amount of heat energy, make the combustion gas rise suddenly, the volume of potatoes or violently expand, forming a high expansion pressure.

Dust control:

Bio-nano membrane dust suppression technology, bio-nano membrane is a double ionospheric membrane with nanolayer spacing reaching the nanometer level, which can maximize the ductility of water molecules and has strong charge adsorption; Spraying the bio-nanofilm on the surface of the material can attract and agglomerate small particles of dust, so that they can polymerize into large particle dust particles, which will increase their weight and settle.

The cloud dust suppression technology is through high-pressure ion atomization and ultrasonic atomization, which can produce ultra-fine dry fog of 1 m and 100 m. The ultra-fine dry mist particles are fine, fully increasing the contact area with the dust particles, and the water mist particles collide and condense with the dust particles to form agglomerates, which continue to grow larger and heavier in the hail cavity until the final natural settlement to achieve the purpose of eliminating dust.

Wet dust collection technology absorbs the air attached to the dust through pressure drop, and removes the dust under the dual action of centrifugal force and the mixing of water and dust gas; Key designs such as unique impellers provide higher dust collection efficiency. It is suitable for bulk material production, processing, transportation, loading and unloading, such as mines, construction, quarries, storage yards, ports, thermal power plants, steel plants, garbage disposal and other places.

1) Solid materials are formed by mechanical impact, grinding and rolling, and are dispersed by air flow and suspended in the air.

2) The vapor produced when the substance is heated condenses in the air or is oxidized to form soot.

3) incomplete combustion of organic matter, the formation of smoke.

Yili energy-saving YK filter cartridge dust purifier has a purification efficiency that can be achieved.

1) Mechanical processing or crushing of solid substances, such as metal grinding, cutting, drilling, blasting, crushing, grinding, processing of agricultural and forestry products, etc.

2) Dust particles formed by the condensation or oxidation of the collision vapor generated when the substance is heated in the air, such as metal smelting, welding, casting, etc.

3) Particuates formed by incomplete combustion of organic matter, such as smoke and dust generated by the combustion of wood, oil, coal, etc.

4) The mixing of sand turning, sand cleaning powder substances of castings, sieving, packaging, handling and other operations, as well as the deposited dust due to vibration or Qin Song air movement, so that the deposited dust floats in the air again (producing secondary dust) is also dust.

2. Introduction. Solid particles that can float in the air for a long time are called dust. The dust formed in the production process is called production dust. According to colloidal chemistry, dust is an aerosol with air as the dispersed medium and solid particles as the dispersed phase.

Dust hazards are manifold. Dust has a negative impact on the human body, production process, product quality, economic benefits, environment and ecological balance.

1) Harm to the human body. Workers who have been exposed to production dust for a long time will gradually increase the accumulation of dust in the lungs due to long-term inhalation of dust, and pneumoconiosis can be caused when it reaches a certain amount. Pneumoconiosis is one of the most important hazards of productive dust to the human body, long-term inhalation of free silica dust can cause silicosis, long-term inhalation of metallic dust such as manganese dust, beryllium dust, etc., can cause manganese lung, beryllium disease and other metal lungs; Long-term inhalation of coal dust can cause coal lungs, etc.

Long-term exposure to productive dust can also cause respiratory diseases such as rhinitis, pharyngitis, bronchitis, as well as mucosal damage, rash, dermatitis, and ocular conjunctival damage. For example, inhalation of lime dust can cause nasal mucosal damage; Inhalation of fibrous dust such as wool and hemp can cause tracheitis and bronchitis; Exposure to asphalt fumes in sunlight can cause photosensitive dermatitis, ocular conjunctivitis, etc. Inhalation of harmful substances and dust can also cause acute or chronic poisoning, such as long-term inhalation of manganese dust in welding operations, which can cause manganese poisoning, and lead smelting workers are prone to lead poisoning.

2) Harm to production. The dust in the air in the workplace adheres to high-level, precision instruments and meters, which can reduce the accuracy of these equipment; Attached to the transmission and running parts of machinery and equipment, the wear is strong and the service life is shortened; Dust can make certain chemical products, mechanical products, electronic products, such as paints, films, miniature bearings, motors, integrated circuits, capacitors.

deterioration of the quality of equipment, televisions, video recorders, cameras, etc.; It affects people's vision in the production process and reduces work efficiency.

3) Harm to the environment. Dust floating in the air can cause other harmful substances to adhere to it, forming serious air pollution. Inhalation of organisms can cause various diseases, and the surface of cultural relics, monuments, and buildings will be corroded and polluted.

In addition, large amounts of dust are suspended in the air, which can reduce the visibility of the atmosphere, promote the formation of smog, and affect the thermal radiation of the sun.

4) Impact on economic benefits. It is mainly manifested in reducing product quality, reducing product qualification rate, and reducing product quality; Due to the shortening of the service life of machinery and equipment, the investment in fixed assets increases, the cost of products rises, and the market competitiveness weakens; Occupational patients are incapacitated due to dust, and medical expenses, nursing expenses, and health welfare expenses increase; Working in the high-concentration dust workplace, the operator is worried about health, the psychological burden is heavy, and the ability to work is lost earlier than under normal circumstances, which accelerates the cycle of training technical personnel of the enterprise, and the training cost is large, and at the same time causes the instability of labor productivity.