Application of large diameter butterfly valve in environmental protection industry and introduction of particulate matter

Large diameter butterfly valve

In the environmental protection industry, the type of valve used is more than a large-diameter butterfly valve. The main reason is that the large-diameter butterfly valve has a relatively simple structure. Under the same caliber, the butterfly valve has a small volume* and a light weight*. The larger the diameter of the valve, the more obvious the weight and volume advantage of the butterfly valve. For example, the 40" valve, if it is a butterfly valve, can be done by many manufacturers, and if it is a ball valve, this caliber is made to be expensive.

Corresponding technical requirements for valves in purification systems

The environmental protection engineer shall put forward corresponding technical requirements according to the function and use occasions of the selected valve in the purification system, mainly including: reliability, rigidity, tightness, wear resistance, turbidity, temperature resistance, ** Sex.

Respirable particulate matter

Inhalable particulate matter refers to particulate matter suspended in air with an aerodynamic equivalent diameter of < 10 microns. The concentration of respirable particulate matter is expressed in milligrams of respirable particulate matter per cubic meter of air. In the Environmental Air Quality Standard (GB3095-1996) promulgated by the State Environmental Protection Administration in 1996, the fly ash was renamed as respirable particulate matter as the official atmospheric environmental quality standard.

The smaller the diameter of the particles, the deeper the area into the respiratory tract. Particles of 10 micron diameter are usually deposited in the upper respiratory tract, 5 micron in diameter can enter the deep part of the respiratory tract, and below 2 microns can penetrate 100% into the bronchioles and alveoli.

Total suspended particulate matter

Total suspended particulate matter refers to a general term for solid and liquid particulate matter floating in the air, and has a particle size ranging from about 0.1 to 100 micrometers. Some particulate matter can be seen by the naked eye due to its large particle size or black color, such as smoke. Some are so small that they can be observed using an electron microscope. Particles with a particle size below 10 microns are often referred to as PM10, also known as respirable particulates or fly ash. Inhalable particulate matter (PM10) lasts long in ambient air and has a significant impact on human health and atmospheric visibility. Some particulate matter comes from direct emissions from sources such as chimneys and vehicles. Others are fine particles formed by the interaction of sulfur oxides, nitrogen oxides, volatile organic compounds and other compounds in the ambient air. Their chemical and physical composition varies depending on location, climate, and season of the year. Very big. Respirable particulate matter is usually derived from motor vehicles that are used on unpaved, cemented road surfaces, crushing and grinding processes of materials, and dust that is raised by the wind.

Hazard of particulate matter

When inhaled particulate matter is inhaled by humans, it accumulates in the respiratory system, causing many **. Exposure to coarse particles can invade the respiratory system and induce disease. Fine particles may cause heart disease, lung disease, respiratory tract, and lower lung function. Therefore, the risk is greater for sensitive people such as the elderly, children and people with heart and lung disease. In addition, particulate matter in the ambient air is the main cause of reduced visibility and can damage the building surface.