Classification of wet dust collectors:
(1) Can be divided into categories according to energy consumption
(1) Low energy consumption type: resistance below 4000Pa, dust removal The efficiency can reach 90. This type of dust collector includes spray type, water bath type, impulse type, foam type, and cyclone water film type dust collector.
(2) High energy consumption type: The resistance is above 4000Pa and has high efficiency against fine dust. This type mainly refers to the Venturi dust collector.
The structure of wet dust collectors: Although the structures of different types of wet dust collectors are quite different, they generally consist of a dust gas introduction device, a water diversion device, a water gas contact body, a droplet separator and It consists of sewage (mud) discharge device.
(2) According to the gas-liquid contact method, it can be divided into
(1) Overall contact type: dust-laden airflow rushes into the liquid and is washed, such as self-excited type, cyclone water type Membrane type, foam type and other dust collectors;
(2) Dispersed contact type: spray into the dust-containing airflow, dust particles collide with water droplets and liquid film and are captured, such as venturi tube, spray Tower etc.
(3) According to the structural type, it can be divided into
(1) Water storage type: a certain amount of water is contained inside, and the high-speed dust-containing gas impacts to form water droplets, water films and bubbles, which are harmful to Dust-containing gas is washed, such as impulse dust collector, water bath dust collector, and horizontal cyclone water film dust collector.
(2) Pressurized water spray type: Supply pressurized water into the dust collector, and use spray or spray to generate water droplets to wash the dust-containing gas; such as Venturi dust collector, foam dust collector Containers, packed towers, turbulent towers, etc.
(3) Forced rotating spray type: Use mechanical force to force rotating spray, or rotate the blades, so that the water supply forms water droplets, water films, and bubbles to wash the dust-containing gas. Such as rotary spray dust collector.
Selection basis of wet dust collector:
1. Corrosiveness. Anti-corrosion measures should be considered when purifying corrosive gases.
2. Dust removal efficiency. The efficiency of the wet dust collector is one of the most important performance indicators to choose. The gas flow rate under a certain state determines the specific dust pollutants, and the state of the gas has a direct impact on the collection efficiency.
3. Adhesion. Wet dust collectors can purify cohesive dust, but flushing and cleaning should be considered. To prevent clogging.
4. Water consumption. How much water is consumed by the dust collector and the discharged sewage treatment, and the winter antifreeze measures for the water.
5. Mud treatment. Slurry treatment is a problem that wet dust collectors will inevitably encounter, and efforts should be made to reduce the harm of pollution.
6. Operation and maintenance. Generally, moving or rotating parts should be avoided inside the dust collector. Note that if the gas passes through the flow channel section too small, it will cause blockage.