The dust removal principle of bag filter is discussed.

A dust collection hood is set up in each ash place, and the dust-containing gas is transported to the dust removal device through the pipeline gas path, in which the dust is collected in the dust removal device after the gas-solid separation is carried out, and the clean gas is introduced into the main pipe or directly discharged into the whole set of equipment into the atmosphere, that is, the dust removal system, and the dust collector is an important part of the system. From the perspective of ventilation and dust removal, dust is all solid small particles that can float in the air for a long time, and is a dispersion system, called aerosol, in which air is the dispersed medium and solid particles are the dispersed phase. A dust collector is a device that separates these small solid particles from aerosols.

Hello: The gas purification method of the bag filter is external filter, and the dusty gas enters the filter room of each unit evenly from the air flow distribution device at the inlet. The airflow enters the bag chamber evenly from the side and the lower part through the appropriate diversion and natural flow direction distribution of the choke and diversion type airflow distribution device, and the airflow in the entire filter chamber is evenly distributed; The particle dust in the dust-containing gas falls directly into the ash hopper after being separated by natural sedimentation in the air inlet duct, and the rest of the dust enters the filter area of the middle box with the air flow under the guidance of the flue gas diversion device, and is adsorbed on the outer surface of the filter bag.

The filtered clean gas is discharged through the filter bag through the upper box and exhaust pipe.

With the progress of the filtration condition, when the surface area of the filter bag reaches a certain amount of dust, the ash cleaning control device (timing control) opens the electromagnetic pulse valve according to the set program to spray, and the compressed gas induces several times the amount of air jet to enter the filter bag through the nozzle on the injection pipe through each pulse valve in a very short time sequence, forming an air wave, so that the filter bag produces a sharp expansion and impact vibration from the bag mouth to the bottom, resulting in a strong ash cleaning effect and shaking off the dust on the filter bag.

The dust that falls into the hopper is sent out centrally through the ash conveying facility.

There are 5 types of dust removal methods, and the following describes the various principles.

1. Electrostatic precipitator At present, the common types of electrostatic precipitator equipment in China can be roughly divided into the following categories: vertical and horizontal according to the direction of airflow, plate type and tube type according to the precipitation pole type, dry wet type, rotary umbrella type high-efficiency electrostatic precipitator and special high-voltage electrostatic precipitator according to the dust removal method on the precipitation plate. Uses Separation of particulate dust and fine dust in industrial exhaust gas, widely used in metallurgy, mining, cement, thermal power plants, building materials, foundry, chemical industry, tobacco, asphalt mixer, grain, mechanical processing, boiler dust removal, cement raw meal, clinker mill, cupola and so on.

2. Bag filter Most of the types of bag filters are named according to the way of ash cleaning, which are mainly divided into three types: mechanical vibration bag filter, atmospheric back-blowing bag filter and pulse jet bag filter, which have a high grading dust removal efficiency for fine dust with sub-micron particle size, and a wide range of gas volume. Uses Separation of particulate dust and fine dust in industrial waste gas, widely used in metallurgy, mining, cement, thermal power plants, building materials, foundry, chemical industry, tobacco, asphalt mixer, grain, mechanical processing, boiler dust removal.

3. Cyclone dust collector Cyclone dust removal equipment is a device that uses the principle of centrifugal force generated by accelerating the rotation of gas, and separating the rotating solid dust from the gas. Uses: Suitable for all kinds of industrial boilers, machining, metallurgical building materials, casting, mining, cement, mining dust coarse and intermediate purification.

4. Wet dust collector The types of wet dust collectors have different classifications from different angles: according to the structural type, they can be divided into water storage wet dust collectors, pressurized water spray types and forced rotary spray wet desulfurization dust collectors;According to the energy consumption, it can be divided into low energy consumption and high energy consumptionAccording to the gas-liquid contact type, it can be divided into integral and dispersed contact wet dust collectors. It is suitable for metallurgy, coal, chemical industry, casting, power generation, building materials and refractory industries.

5. Desulfurization dust collector The desulfurization dust collector mainly uses the flue gas through the stainless steel bulk packing, which increases the contact surface between the flue gas and the aqueous solution, accelerates the full dissolution and neutralization of the flue gas and spray water, and improves the dust removal and desulfurization efficiency of the dust removal device. Uses: It is suitable for all boilers and kilns that emit smoke and dust.

Using the gravity sedimentation, inertia or centrifugal force of BAI dust to separate the dust, its dust removal efficiency is generally in.

DAO is less than 90%, the dust removal efficiency is low, the resistance is low, and the advantage is to save energy.

The dust-containing gas passes through a strong electric field, so that the dust particles are charged, and when it passes through the dust removal electrode, the particles with positive and negative charges are adsorbed by the negative positive electrode plate respectively, thereby removing the dust in the gas. The dust removal efficiency of the electrostatic precipitator is high, but its dust removal efficiency is greatly affected by the specific resistance of dust, which is easy to lead to the instability of the dust removal efficiency. After the 90s of the 20th century, electrostatic precipitators have been widely used in the control of smoke and dust pollution at high temperature, large flue gas volume and complex working conditions such as thermal power generation and cement kilns.

The fiber filter material is used to capture the solid particles in the dust-containing gas to form a filter dust cake, and the fine dust particles are further filtered through the filter dust cake to achieve the purpose of efficient dust removal. The bag dust removal equipment can stably achieve a high dust removal efficiency, and the dust emission can reach less than 5mg m3, and the dust removal efficiency is not affected by dust characteristics such as dust specific resistance. In general, dust with a particle size of less than 10 microns (i.e., inhaled particulate matter) has a greater impact on human health, and baghouses have a high separation efficiency for inhalable particulate matter.

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Answer]: C needle mesh filter material has a deep filtration effect, and the mechanical vibration cleaning method is suitable for the filter bag based on the surface Qiaoyin digging filtration, and has almost no effect on the dust cleaning and cleaning ash of deep filtration.