Aogong teaches you the key factors to consider when selecting a spray‑type dust suppression system.

Aogong teaches you how to select a spray‑type dust suppression system and the key factors to consider for dust control.

Dust source;

Dust refers to fine solid particles that can remain suspended in the air, originating from natural processes or industrial production. Internationally, particles with a diameter of less than… 75 mu m Solid particulate matter is defined as dust. Among these, the dust particles that contribute to atmospheric pollution are primarily generated by human activities; for example, thermal power generation, steel plants, and chemical factories are major sources of air and particulate‑matter pollution. Meanwhile, pollution from residential, industrial, and construction activities is widespread, with large total emissions and significant localized impacts that cannot be ignored. Currently, worldwide annual emissions of coal dust and other particulates into the atmosphere exceed 100 million tons, with the most severe atmospheric pollution occurring in industrial zones.

Spray‑based dust suppression: This method uses high‑pressure atomization to generate fine mist particles that disperse into the air. The rapidly moving water droplets efficiently capture airborne particulates, causing them to coalesce with the mist. Through diffusion, moisture absorption, and adhesive forces, the particles become heavier and aggregate, effectively trapping dust in the atmosphere or particulates in exhaust gases. Ougong’s commonly used spray‑type dust‑control equipment includes dust‑suppression fog cannons, industrial humidifiers, dry‑mist dust‑suppression systems, micron‑scale dry‑mist dust control, two‑fluid dry‑mist systems, and wet‑type dust collectors. These devices are highly targeted, deliver excellent dust‑removal efficiency, and can… 10 Sub-micron dust particles can still maintain very high dust removal efficiency. Moreover, it exhibits excellent performance and superior safety when purifying high-temperature, high-humidity, and flammable dust.

Factors to Consider When Selecting a Dust Removal Method

( One ) Consideration of dust particle size distribution

The dispersion of dust has a significant impact on its performance, and even when the same equipment is used, variations in operating conditions can lead to substantial differences in dust dispersion. Therefore, when selecting a particular type of equipment, the first priority is to accurately determine the dust’s degree of dispersion. For example, if the particle size of the dust is in… 10 mu m In the above cases, centrifugal force should be selected, and for particle size… 10 mu m When particulate matter constitutes the majority, micron‑scale dry fog or dry‑fog dust suppression systems should be selected. The specific choice can be determined based on the particle size distribution and other requirements, and subsequently aligned with the performance and design criteria of the various spray types and configurations.  

( Two ) Consideration of dust particle size

When dust particles collide with droplets of an appropriately sized distribution, the dust‑capture efficiency increases. If the droplets are too small, they cannot effectively capture fine dust particles; conversely, excessively small droplets may evaporate too rapidly, releasing the captured dust. Therefore, determining the particle size distribution of the dust is essential for the design of spray‑based dust‑control systems.  

( Three ) Consideration of the material’s motion state

When dust‑removal water is sprayed onto stationary material, droplet size and nozzle spray angle influence the spray coverage area.

When dust‑removal water mist is sprayed onto moving material, droplet size and spray velocity influence the spray coverage area.

These factors must be taken into account when selecting and installing nozzles.  

( Four ) Considerations Regarding Dust Adhesion

The adhesion mechanism between dust particles and surfaces is highly complex and is known to be strongly influenced by the specific surface area of the dust. The specific surface area of the dust… F It is the surface area per unit volume of dust particles, for example, if… d Let denote the diameter of a spherical dust particle; then F It will be expressed as follows: particle size of dust d The smaller it is, the larger the specific surface area. F The larger the particle size, the greater its adhesion. Of course, dust adhesion depends not only on its specific surface area but also on the dust’s composition, the properties of the gas, and the characteristics of the interactions between the dust particles themselves.

( Five ) Considerations regarding water source quality

In many dust‑removal applications, poor‑quality water can lead to frequent nozzle maintenance, accelerate nozzle wear, shorten nozzle service life, and reduce dust‑removal efficiency.

( Six ) Considerations for the Temperature of Dust-Laden Gases

In principle, dry‑fog dust‑removal equipment must operate at a temperature above the dew point of the dust‑laden gas. For instance, even trace amounts of sulfur trioxide in such a gas can significantly raise its dew point. Furthermore, in wet‑type systems, due to water evaporation and subsequent condensation upon release into the atmosphere, treatment should be carried out at as low a temperature as possible.

( Seven ) Considerations for Using Wet Dust Collection

Most wet‑type systems use water. When the dust‑generating equipment is relatively small, when it is necessary to simultaneously remove harmful gases, or when extremely fine particulates such as carbon black must be completely captured, wet‑type processes are often employed. The temperature of the dust‑laden gas discharged in wet systems is reduced; therefore, in addition to considering potential reductions in atmospheric dispersion, longer plume lengths, and downwind deposition of aerosols, measures must also be taken to treat the washwater.

( Eight ) Considerations Regarding the Properties of Dust-Laden Gases

To ensure effective utilization, the properties of the following dusts and dust-laden gases should be addressed on a case-by-case basis. (1) Oxidation of Carbon Monoxide Flue Gas: When treating exhaust flue gas containing carbon monoxide, to prevent explosions, air is introduced into the high-temperature section of the flue at the outlet of the gasifier, oxidizing carbon monoxide into carbon dioxide. (2) Enhance dust agglomeration by employing indirect cooling methods such as heat exchangers, direct cooling and humidification via water spray, or electrostatic coalescence. (3) Changing the specific resistivity of dust: In cases involving high-resistivity dust, such as in fuel coal, heavy oil can be co-fired with high-sulfur coal, or conditioning agents like water, steam, or sulfur trioxide can be injected to reduce the dust’s specific resistivity. On the other hand, when burning heavy oil produces dust with excessively low resistivity, ammonia can be sprayed to form ammonium sulfate, which has a higher resistivity, thereby adjusting the overall static resistivity of the dust to 10 ~ 10 Within the scope.

( Nine ) Considerations for the decision on capacity

The properties of dust-laden gases can vary significantly with operating or combustion conditions, exerting a substantial influence on dust-collection performance. Once dust-collection equipment is put into actual operation, achieving dust concentrations that meet the design specifications is often quite challenging. Moreover, it is difficult to predict whether the environmental conditions at the operating site and during equipment installation will degrade or enhance its performance. Consequently, when sizing the equipment, it is essential to allow for a sufficient margin of capacity and to reserve additional space for potential future upgrades.

(10) Considerations Regarding Gas Supply Conditions

Air‑atomizing nozzles mix liquid with compressed air to produce extremely fine droplets, which evaporate rapidly, making them ideal for dust‑control applications that require a specific level of humidity without excessive moisture. The ultra‑fine atomized particles are also well suited for dust‑removal tasks that demand the capture of minute airborne particulates.

(11) Considerations Regarding Material Properties

The moisture‑addition response varies among different materials; therefore, precise control of the moisture level is essential. Insufficient moisture will fail to fully address dust‑generation issues, while excessive moisture can alter material properties and lead to quality problems.

When selecting and designing a dust‑removal solution, these factors deserve careful consideration; choosing the right spray equipment is paramount.

General-purpose spray dust-control systems are typically the most economical and the easiest to design and implement.

Adding a dust‑removal additive to water reduces the surface tension of the droplets, enhances the adhesive forces between water and a specific type of dust, and improves dust‑removal efficiency; however, this approach is not suitable for all material properties.

Foam dust‑removal systems can conserve water, but they typically require compressed air, which may also lead to material contamination.

When a binder is used in the spray medium, the binder coalesces dust particles upon evaporation of the moisture, achieving a dust‑removal effect; however, the binder can harden and clog the nozzle.

Fog‑gun dust suppression: covers a large area, boasts a long spray range, and uses minimal water (ideal for outdoor dust control).

Guangzhou Aogong Spray Equipment Co., Ltd. -13 A specialized manufacturer integrating the production, design, sales, and installation of industrial nozzles, misting equipment, and misting systems. With many years of experience in R&D, manufacturing, sales, and installation, the company boasts strong technical expertise, state-of-the-art process equipment, a robust quality assurance system, and comprehensive testing facilities. Key personnel across design, production, R&D, sales, quality assurance, and marketing departments have all undergone professional training, and the company has successfully obtained… ISO9001 Quality management system certification. Possesses import and export rights, 20 Patent certificates for the remaining product lines. A comprehensive quality management system provides robust quality assurance to our broad customer base. More information on spray dust suppression technology 020-86877326 。