With increasing environmental awareness in various countries, dust removal in oil processing production lines has become an indispensable part. Today, we'll discuss dust removal equipment for oil processing production lines.
1.Mechanical Dust Collection
1.1 Gravity Settling Chamber:
This is the most basic dust collection device. The principle is that when dust-laden gas enters a large space, the sudden increase in cross-sectional area causes a rapid decrease in gas velocity. Dust particles gradually settle to the bottom of the chamber under their own gravity, while the purified gas is discharged from the top. This method is simple in structure and low in cost, and can handle high-temperature gases, but its dust collection efficiency is relatively low, generally only removing larger particles (usually greater than 50μm). For example, in some small oil processing workshops, gravity settling chambers can be used as a preliminary dust collection method for some large dust particles generated during raw material transportation.
1.2 Inertial Dust Collector:
This method utilizes the difference in inertial forces between dust and gas during motion to remove dust. When dust-laden gas enters the dust collector, the gas moves in a straight line, while dust particles, due to inertia, deviate from the direction of gas movement and collide with obstacles such as baffles inside the dust collector, thus being separated. Inertial dust collectors have a higher dust removal efficiency than gravity settling chambers and can handle dust particles larger than 10μm. Their structure is also relatively simple, resulting in lower resistance. However, their effectiveness in removing small-diameter dust particles is limited. In oil processing, inertial dust collectors can be used to collect larger dust particles flying at the feed inlet of some processing equipment.
2. Filter-type dust collection
2.1 Baghouse dust collector:
This is a typical example of filter-type dust collection. Dust-laden gas enters from the outside of the filter bags. As the gas passes through the bags, the dust is trapped on the outer surface, and the purified gas is discharged from the inside through the bags. Baghouse dust collectors have a high dust removal efficiency, reaching over 99%, and can effectively remove dust particles with a diameter of 0.1-20μm. They are highly adaptable and have good dust removal effects on dust of different properties. However, baghouse dust collectors also have some drawbacks. For example, the filter bags are prone to clogging, requiring regular cleaning and replacement. Furthermore, they are sensitive to certain conditions regarding gas humidity and temperature. For instance, excessively high humidity can cause the filter bags to become clogged, affecting dust collection efficiency. In oil processing plants, baghouse dust collectors are highly effective for collecting fine dust such as flour dust and meal dust generated during processing.
2.2 Cartridge Dust Collector:
Similar in principle to baghouse dust collectors, it removes dust through filtration. However, it uses cartridges as the filtration element. Compared to bags, cartridges have a larger filtration area, allowing for a smaller volume for the same airflow. Filter cartridge replacement is also relatively convenient. It boasts high dust removal efficiency, effectively removing fine particulate dust, making it suitable for oil processing workshops with limited space and relatively low dust concentrations.
3. Wet Dust Collector
3.1 Spray Tower Dust Collector:
Dust-laden gas enters from the bottom of the tower, while liquid (usually water) is sprayed down through nozzles. Dust particles are captured by the liquid droplets upon contact and are carried to the bottom of the tower by the water flow, while the purified gas exits from the top. This type of dust collector effectively removes small dust particles while also cooling and humidifying the gas. However, it presents wastewater treatment challenges, and its effectiveness is affected if the dust particles are hydrophobic. In oil processing, spray tower dust collectors are effective for some hydrophilic dusts, such as dust containing some water-soluble impurities.
3.2 Venturi dust collector:
When dust-laden gas passes at high speed through the throat of a Venturi tube, a negative pressure is created at the throat, drawing in and atomizing liquid (such as water). Dust particles are thoroughly mixed and collided with the atomized droplets, being captured by the droplets, and then separated into gas and liquid in a subsequent separation device (such as a cyclone separator). Venturi dust collectors have high dust removal efficiency and can handle dust particles with a diameter of 0.1-10μm, but they have relatively high resistance losses and operating costs. They are suitable for oil processing processes with extremely high dust removal efficiency requirements, such as the removal of extremely fine dust in high-precision oil refining workshops.
4. Electrostatic Precipitation
4.1 Plate Electrostatic Precipitator:
This type of precipitator contains a series of plates. A high voltage is applied between the plates, creating a strong electric field. When dust-laden gas enters the electric field, the dust particles become charged under the influence of the electric field force. The charged dust particles move towards the plates and are adsorbed onto them, thus separating the dust from the gas. Plate electrostatic precipitators have high dust removal efficiency, reaching 90%-99%, and can handle dust particles with a diameter of 0.01-100μm. They also have low resistance loss and low operating costs. However, they have high equipment investment costs and require a certain level of conductivity from the dust particles. In oil processing plants, for applications requiring high-precision dust removal and with fine dust particles, such as oil packaging workshops, plate electrostatic precipitators can ensure a clean packaging environment.
4.2 Tubular Electrostatic Precipitator:
The working principle is similar to that of a plate electrostatic precipitator, except that it uses tubular electrodes. Tubular electrostatic precipitators are more suitable for handling gases with low dust concentrations, and offer relatively high safety when handling flammable and explosive dusts. In specific stages of grease processing, such as in workshops where fine grease raw materials prone to static electricity are pre-treated, tubular electrostatic precipitators can reduce the risk of static electricity generation while removing dust.
5. Cyclone Dust Collectors
5.1 Ordinary Cyclone Dust Collectors:
Dust-laden gas rotates at high speed inside the cyclone dust collector. Due to centrifugal force, dust particles are thrown against the wall and then fall into the ash hopper under gravity. The purified gas is discharged from the central tube. It has a simple structure, is easy to operate, and is inexpensive. It can handle dust particles with larger diameters (usually greater than 5μm) and can handle high-temperature, high-pressure gases. However, its dust removal efficiency is not particularly high, and its effect on removing smaller dust particles is limited. Ordinary cyclone dust collectors can be used in some primary dust removal stages in grease processing plants, such as during the initial cleaning of raw materials, to remove larger particulate impurities and dust.
5.2 High-efficiency cyclone dust collector:
By improving the structure of the cyclone dust collector, such as optimizing the inlet method and adding flow guiding devices, the flow field of gas within the dust collector is made more reasonable, thereby improving dust removal efficiency. High-efficiency cyclone dust collectors can handle dust particles with a diameter of approximately 3-5μm. In oil processing, they can be used as intermediate-level dust removal equipment and combined with other dust removal equipment to improve the efficiency of the entire dust removal system.
