Diameter selection of dust collector ducts

Commonly used white iron pipe diameter (also known as nominal diameter.

Or call the diameter) dn mm: dn15, dn20, dn25

dn32、dn40、dn50、dn65、dn80、dn100、dn125、dn150

Commonly used low-pressure fluids (working pressure in "MPa") to transport welded steel pipes.

There are: DN8, DN10, DN15, DN20, DN25, DN32, DN40, DN50, DN65, DN80, DN100, DN125, DN150 and the outer diameters of them are

Commonly used low-pressure fluid fittings are: pipe joints, union joints.

Elbows, tees, tees, large and small heads, fillers, external joints, plugs.

Ordinary seamless steel pipe.

Common specifications (outer diameter) are: DN57, DN60, DN73, DN76, DN89, DN102, DN108, DN114, DN133, DN140, DN159, DN168, DN219, DN245, DN273

Spiral seam welding.

The common specifications (outer diameter) of steel pipes are: DN219, DN245, DN273, DN325, DN377, DN426, DN478, DN529, DN630, DN720

There are other things that don't need to be cited so much, you go to check the relevant information, such as longitudinal seam coiled welded steel pipes, socket type water supply cast iron pipes, and rigid PVC pipes.

If welded pipes are used, they are all national standard or non-standard. If you use a spiral duct, the diameter is from 100mm to 1000mm, and the number of steps is increased by 50mm......1000) thickness0, there are other non-standard plate thickness, larger than almost none (the reel can not roll).

The selection of pipe diameter should be calculated according to the required air volume, wind speed and wind pressure of each section of the pipeline, otherwise it is easy to have a small air volume and low wind speed at the far end of the tuyere. I can teach you how to do the math if needed.

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The comparison table of the diameter of the pro-dust removal pipe is as follows: the commonly used white iron pipe diameter (also known as the nominal diameter or called the diameter) dn mm is: dn15, dn20, dn25dn32, dn40, dn50, dn65, dn80, dn100, dn125, dn150 The square of the diameter of the dust collector pipe = 4 Air volume:

3600 pipeline wind speed such as 10000m3 h air volume of the pipe required to calculate the pipe diameter, if the pipeline wind speed is calculated according to 18m s 4 10000:3600. In 1966, then open the square to get the rice, that is, 450mm, in order to avoid the blockage of the bag filter pipe, according to the nature of the dust, the small diameter of the pipe containing fine dust in the dusty gas should not be less than 4100mm, the small diameter of the pipe containing coarser particles in the dusty gas should not be less than 4150mm, and the small diameter of the pipe containing viscous powder or larger lumpy mixed dust in the dusty gas should not be less than 4200mm.

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Summary. Hello, I am glad to serve you and give you the following answers: The multi-tube dust collector is located in the dust collection room at the tail of the No. 1 belt, which is mainly used to collect coal dust and reduce air pollution.

Reasons for the problem:1Clogged pipes:

Due to the excessive accumulation of coal dust in the pipeline, the pipeline is blocked, which affects the normal operation of the dust collector. 2.Fan failure:

A faulty fan will cause the dust collector to not work properly, which will affect the dust collection effect. Workaround:1

Clean the pipes: Clean the coal dust inside the pipes regularly to prevent the pipes from clogging. 2.

Check the fan: check the fan regularly, find the fault in time, and repair it in time to ensure the normal operation of the dust collector. Personal Experience:

The dust collector is an important equipment for coal dust collection, and the coal dust in the pipeline should be cleaned regularly and the fan should be checked in time to ensure the normal operation of the dust collector and reduce air pollution.

The model of the dust collector used in the coal conveying system of our plant is the multi-tube dust collector division in the dust removal room at the tail of the No. 1 belt () Hello, we are happy to serve you and give you the following answers: The multi-tube dust collector division is in the dust removal room at the tail of the No. 1 belt, which is mainly used to collect coal dust and reduce air pollution. Causes of the problem:

1.Pipeline blockage: Due to the excessive accumulation of coal dust in the pipeline, the pipeline is blocked, and Danbi affects the normal operation of the dust collector.

2.Fan failure: Fan failure will cause the dust collector to not work properly, which will affect the dust removal effect.

Workaround:1Clean up the pipes:

Clean the coal dust in the pipes regularly to prevent the pipes from clogging. 2.Check the fan:

Regularly inspect the fan, find faults in time, and maintain them in time to ensure the normal operation of the dust collector. Personal experience: The dust collector is an important equipment for the collection of coal dust, and the coal dust in the pipeline should be cleaned regularly and the fan should be checked in time to ensure the normal operation of the dust collector and reduce air pollution.

Can you add, I don't quite understand it.

Hello, I am glad to serve you and give you the following answers: The multi-tube dust collector is located in the dust collection room at the tail of the No. 1 belt, which is mainly used to collect coal dust and reduce air pollution. Causes of the problem:

1.Pipeline blockage: Due to the excessive accumulation of coal dust in the pipeline, the pipeline is blocked, and Danbi affects the normal operation of the dust collector.

2.Fan failure: Fan failure will cause the dust collector to not work properly, which will affect the dust removal effect.

Workaround:1Clean up the pipes:

Clean the coal dust in the pipes regularly to prevent the pipes from clogging. 2.Check the fan:

Regularly inspect the fan, find faults in time, and maintain them in time to ensure the normal operation of the dust collector. Personal experience: The dust collector is an important equipment for the collection of coal dust, and the coal dust in the pipeline should be cleaned regularly and the fan should be checked in time to ensure the normal operation of the dust collector and reduce air pollution.

The most commonly used common material for dust removal pipes is Q235 steel plate, which has the characteristics of sturdy, durable, low cost, and easy to make and install. The way to chooseCangzhou Yiyang Environmental Protection Technology Co., Ltd. believes that it should be according to the matching of wind speed and dust properties, the larger the air volume, the larger the reasonable diameter of the average wind, and the comparison of pipe diameter and thickness is generally recommended to be carbon steel plate with a diameter of 400 or less, between 400 and 600mm, and higher than the carbon steel pipe used in 600mm.

Galvanized spiral pipe.

In addition, in the past two years, the largest amount of organic waste gas is galvanized spiral pipe, which has low cost, easy installation and high resistance, and is not recommended to be used in working conditions with large dust concentration!

The following two types of pipes are less used in general dust removal conditions, and only the answer to the suggestion is made:

Wear-resistant materials mainly include quenched wear-resistant steel, heat-resistant and wear-resistant alloy steel, silicon carbide wear-resistant materials, C-T ceramic composite steel pipes, etc. Because the abrasive wear is mainly abrasive in the wear of dust removal and pneumatic transmission pipelines, the degree of wear mainly depends on the hardness of the material itself, so the research of wear-resistant materials is mainly in the direction of improving the hardness of the material.

In addition, according to the characteristics of the conveying medium and the variety of pipe materials in the chemical plant, (GB8163-1987) hot-rolled seamless steel pipes, (GB3092-1993) welded steel pipes, (YB242-1963) longitudinal welded steel pipes, cast iron pipes, etc. are generally used.

Hope it helps!

Dust removal duct materials include common materials and wear-resistant materials.

Q235 steel plate is a commonly used material for dust removal pipes. It is rugged, low-cost, and easy to manufacture and install.

Wear-resistant materials mainly include hardened wear-resistant steel, heat-resistant and wear-resistant alloy steel, silicon carbide wear-resistant materials, C-T ceramic composite steel pipes, etc. Since the wear of the dust removal pneumatic conveying pipeline is mainly abrasive wear, and the degree of wear mainly depends on the hardness of the material itself, the research of wear-resistant materials is mainly aimed at improving the hardness of the material.

In addition, according to the characteristics of the conveying medium and the type of pipeline material in the chemical plant, hot-rolled bellless copper pipes (GB8163-1987), Han copper pipes (GB3092-1993), longitudinal seam copper pipes (YB242-1963) and cast iron pipes are generally used.

When the diameter of the dust removal pipe is 1420 mm, the bracket spacing is different according to the lead crack and wall thickness of the pipe material, assuming that the pipe material is 10 steel, when the wall thickness is 12mm, the maximum allowable horizontal span is 278 meters, when the wall thickness is 5mm, the maximum allowable horizontal span is 291 meters, and the calculation method adopts the formula of Macro SH T 3073-2016.

How to determine the air speed of the air duct of the dust collector The wind speed of the air duct of the dust collector should be selected according to the density of the dust, generally 10-20 meters.

Second. Heavy dust should choose a higher wind speed, otherwise the dust will be deposited in the pipe and block the pipe.

What is the formula for calculating the wind speed of the dust removal pipe?

First, divide the air volume (m 3 h) by 3600, that is, convert its unit to m 3 s.

Then calculated: Pipe section area (m2) = air volume (m 3 s) Wind speed (m s).

Knowing the cross-sectional area of the pipe, the diameter of the pipe (m) can be determined.

How to determine the wind speed of the air duct?

According to the specific friction resistance, the specific friction resistance of the general air duct is between, according to this, the approximate range of the wind speed of the air duct can be obtained, the wind speed of the large pipe is fast, and the wind speed of the small pipe is slow, you can look at the design specifications.

Resistance, the specific friction resistance of the general air duct is between, according to this, you can get the approximate range of the wind speed of the air duct, the general wind speed of the large pipe is fast, the wind speed of the small pipe is slow, you can look at the design specifications.

2013-08-06

d=√[q*4/(ν*

d-Duct diameter (m).

Q-Air volume (m3 h).

v-Wind speed (m s); Let the wind speed be 5m s.

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It is best to consult the equipment supplier for the recommended exhaust volume first. Calculating the size of a duct segment can be done using a series of calculations called the velocity pressure method, which consists of two main variables:

q = gas flow (sometimes referred to as gas volume).

sp = static pressure.

Calculations used to determine the appropriate airflow (q) are provided in the Industrial Ventilation Manual. Air is also needed to overcome resistance from ducts and other parts of the industrial dust collection system. This resistance is known as the total system static pressure (SSP).

Collect ash dust and particles.

When sizing its network, it is important to know the types of pollutants that are collected by the industrial ventilation system. Contaminants have a variety of characteristics, including:

Size particle size distribution.

vapors, gases and fumes.

Welding fumes and metal fumes.

Light or fine dust, such as cotton or flour.

Dust from grinding, polishing, material handling and casting.

Heavy dust such as sawdust, blast dust, boring dust and lead dust.

Heavy dust and damp dust, such as most cement, asbestos and stone dust.

Conveying speed requirements.

It is also key to consider the minimum conveying speed (known as the conveying velocity), which is to move the dust (dust, condensable vapors) without accumulating, stationary to the air flow.

Other speed considerations:

What size dust is being transported?

Does it have any specific properties such as high water content, abrasive, corrosive or flammable?

Calculate the pipe size.

After finally understanding the exhaust volume, collecting pollutants and velocity requirements, the flow equation Q = VA can be used to determine the duct size of the industrial ventilation system.

Airflow volume = velocity of the pipe cross-sectional area.

Dust removal filter cartridges are widely used in cement mills, raw material mills, fuel coal mills, silos, conveyor belt dust points and packaging workshops in cement plants all over the world. The filter cartridge is a kind of cylindrical element used for filtration, and the filter cartridge is generally divided into a filter cartridge used to filter liquid media and a filter cartridge for filtering gaseous media.

Dust removal filter cartridge structure:

1.The dust removal filter cartridge is cylindrical as a whole, the upper and lower covers of the filter cartridge are made of plastic, and the cover plates of other levels of filter cartridges are stamped and formed by electrolytic plate or stainless steel plate.

2.The filter cartridge adopts diamond-shaped mesh, and other levels of filter cartridges use galvanized perforated mesh or stainless steel perforated mesh, and all dust removal filter cartridges are bonded with special glue, which has excellent tensile and impact resistance to ensure that the lid is not taken off and the powder is not leaked.

3.The dust removal filter cartridge is equipped with stiffeners, which has excellent resistance to deformation.

4.Due to different working conditions, dust filtration at room temperature is more suitable for dust removal cartridges. The filter cartridge dust collector has the advantages of high dust removal efficiency, stable equipment operation, and few wearing parts, so it is widely used in industry.

There are three ways to install the dust filter cartridge pulse dust collector: vertical, tilt, and horizontal. The filter cartridge is installed vertically, and when the ash is pulsed, the dust is easy to clear and settle down to the ash hopper, which has a good effect.

When the inclined installation, the filter cartridge is stacked on top of each other, the structure is compact, the floor area is small, and it is convenient to change the cartridge, but when the ash is cleaned, the dust cleared by the upper filter cartridge settles on the lower filter cartridge, which is difficult to remove. Installed horizontally, dust is more difficult to remove from the upper part of the lower cartridge. The inclined installation dust removal cartridge is suitable for the non-viscous, low-concentration, coarse-grained dust removal of small and medium-sized dust removal systems, and is also suitable for the transformation of some old-fashioned bag dust collectors.

There are many varieties of dust removal filter cartridges, which are thin and long and coarse and short. The slender filter cartridge (such as 160, l=1 2m), the gap between the pleats (such as 45 pleats) is large, the angle is large, the pleats are few and shallow, the filtration area is 2 5 times larger than that of the filter bag of the same diameter and length, and the ash cleaning is easy and the effect is good; It is suitable for filtration and dust removal of dust with a concentration of 15g m, and the wind speed is filtered.