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Types and working principles of mechanical dust removal equipment


What is the type and working principle of mechanical dust removal equipment ?


Mechanical dust removal equipment is a device that uses gravity, inertia force, centrifugal force and other mechanical forces to separate dust particles from gas. What is the type and working principle of mechanical dust removal equipment ? There are three main types: sedimentation chambers, inertial dust collectors and cyclones.


(1) Settling chamber


含尘气体中的粉尘在重力作用下与沉降室分离。 The work of the sedimentation chamber uses gravity. The so-called gravity is the attraction of the earth to the object. The dust in the dust-containing gas is separated from the sedimentation chamber by the gravity.


Inertial dust removal equipment


Inertial dust removal equipment uses inertial forces. The so-called inertial force is a force that reflects the state of motion of the material itself. The material changes its state of motion under the action of external forces. Under the same action, the small inertia object is more likely to change the motion state than the large inertia object. E. The obtained acceleration is larger, which is beneficial to the separation of small inertia dust.


Cyclone dust removal equipment


Cyclone dust removal equipment uses centrifugal force. The so-called centrifugal force refers to the reaction force of a circular moving object to the centripetal separation force applied to it. The separation process of a heterogeneous system by centrifugal force separation is usually called centrifugal separation. It works according to the principle that the centrifugal force obtained during the rotation of a substance with high mass and high speed is also large.


Mechanical dust removal equipment has low efficiency, low resistance, and energy saving, and can be used alone for occasions with low air volume and low dust removal requirements. In high demand situations, it is often used as pre-dust removal for advanced dust collectors.


What is the type and working principle of mechanical dust removal equipment ? What parts of the gravity sedimentation chamber are made of them? How to judge its technical performance?


The structure of the horizontal airflow sedimentation chamber is mainly composed of a chamber body, an air inlet, an air outlet and an ash collecting bucket. The dust-containing gas flows slowly in the room, and the dust particles are separated by their own gravity and captured.


Horn type exhaust pipe


机械除尘设备类型和工作原理


The technical performance of the sedimentation chamber can be determined according to the following principles.


("The lower the velocity (basic velocity) of the gas to be processed in the sedimentation chamber, the more favorable it is to capture fine dust particles, but the device is relatively large.


With the same basic flow rate, the longer the depth of the sedimentation chamber, the higher the dust removal efficiency, but it should not exceed 101 x1.


A rectifier plate is installed at the air source, and a baffle is installed in the sedimentation chamber to make the airflow in the sedimentation chamber uniform, improve the inertial collision rate, and help improve the dust removal efficiency.


What is the type and working principle of mechanical dust removal equipment ? What is the principle of dust removal in gravity sedimentation chamber?


The gravity settling chamber is an empty chamber with a large cross section. When the dust-containing gas enters the settling chamber through a pipe with a small cross section, the air velocity is greatly reduced, and the dust particles settle under the action of gravity. For a certain density of dust particles, the larger the particle size, the greater the sedimentation speed under the action of gravity. The smaller the particle size, the smaller the sedimentation speed.


If very fine dust particles settle in the sedimentation chamber by gravity, the sedimentation chamber will become very long. If the length of the sedimentation chamber is to be reduced, the horizontal flow velocity of the airflow must be reduced very low, that is, the horizontal The cross section must grow very large, which is difficult to achieve in reality. Therefore, gravity settling chambers are only suitable for collecting greater than 50 |! !! dust. The velocity of airflow through the settling chamber is usually not greater than 3. "Claw, pressure loss is 10? Surname 00.


The invention has a simple structure, can use bricks, has low cost, easy construction, and convenient management. Especially in the case of no induced draft fan, only in the case of natural ventilation, is a better method of dust removal. Disadvantages are large floor area and low dust removal efficiency. Gravity sedimentation type can be divided into dry type and wet type, dry dust removal efficiency is 40 |? 605, wet dust removal efficiency is 60,? 80 |. In order to improve the dust removal efficiency, you can reduce the height of the sedimentation chamber or set up a multilayer sedimentation chamber.


机械除尘设备类型和工作原理


Generally, only the sedimentation chamber is used for the first-stage rough purification, and the more efficient secondary dust collector is connected in series behind the sedimentation chamber.


What is the type and working principle of mechanical dust removal equipment ? How can I improve the dust removal efficiency of the sedimentation chamber?


In order to improve the dust removal efficiency of the sedimentation chamber, some vertical baffles or shutters can be installed in the sedimentation chamber. The principle is as follows.


Door) to change the direction of the airflow. Due to the large inertia of the dust particles, it is not possible to change the direction with the air, hit the baffle, and lose the ability to continue to fly and settle into the ash collection bucket below.

Prolong the passing time of dust, and make it gradually settle down under the effect of gravity. For settling chambers with baffles, the air velocity can be increased.


The multi-stage dust removal chamber is provided with multiple chamber sections, which relatively reduces the sedimentation height of dust particles and is also conducive to improving the dust removal efficiency.


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