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Selection of dust collector principle method
 
 
Selection of dust collector principle method
 
In 1, the flow rate ( Q )
Air processing refers to the dust collection equipment in unit time can purge gas volume. Unit per hour cubic ( m3 / h ) or standard cubic meters per hour ( Nm3 / h ). Is in the bag type dust collector design is one of the most important factors in.
According to the air volume design or selection of a bag type dust collector, generally can not make the dust collector in exceeding the prescribed quantity of running, otherwise, the filter bag easy blockage, life shortening, loss of pressure rise substantially, the dust collecting efficiency to decrease; but it cannot be air selected is too large, or to increase investment in equipment and covers an area of. Reasonable selection of air processing is often based on technology and experience to decide.
2, the use of temperature
For bag type dust collector, the use of temperature depends on two factors, the first is the highest under temperature filter material, second is the gas temperature must be above the dew point temperature. At present, due to the large glass fiber filter material selection, the maximum temperature is 280 degrees higher than the temperature, the gas must take steps to lower the temperature to below the dew point temperature, the gas must take temperature measures. The bag type dust collector, using temperature and dust collection efficiency is not obvious, which differ from the electric dust, the dust collector, the changes in temperature will affect the dust specific resistance effect of dust collection efficiency.
3, entrance dust concentration
The entrance dust concentration, which is composed of dust emission process of the decision, in the design or selection of a bag type dust collector, it is the second volume of another important factor. In g / m3 or g / Nm3 to represent.
For bag type dust collector, entrance dust concentration will directly affect the following factors:
The pressure loss and the cleaning cycle. Entrance concentration increases, the same area of the filter ash on speed, pressure loss increases, the result is to increase the frequency of cleaning.
The filter bag and the casing wear. In the dust with strong abrasion condition, the wear volume can be seen with dust is proportional to the concentration of.
It is necessary for the pre-collecting. The pre-collecting dust collector at the entrance is in before adding a dust collection equipment, also known as the first stage of dust collection.
The ash discharging device for ash discharge capacity. Ash discharge apparatus of ash-draining ability should be able to discharge all the collected dust is dust quantity, is equal to the entrance dust concentration by volume.
The mode of operation. Bag type dust collector is divided into positive and negative pressure of two kinds of mode of operation, in order to reduce fan wear, entrance large concentration should not adopt the positive pressure operation mode.
In 4, the outlet dust concentration
Outlet dust concentration of dust collector of emission concentration, said the same entrance dust concentration, dust concentration of outlet size should be based on local environmental requirements or user requirements as the standard, a bag type dust collector discharge concentration generally can reach 50mg / Nm3 below.
In 5, the pressure loss
Bag type dust collection of the pressure loss is gas from the dust collector inlet to the outlet of the pressure drop, or resistance. Bag dust collecting pressure loss depends on the following three factors:
The device structure of the pressure loss.
The filter pressure loss. And the filter material properties ( such as porosity, etc.).
The sand dust layer pressure loss.
In 6, the operating pressure
Bag type dust collector operating pressure is according to the dust collector and fan device and the static pressure value and its installation position and set, and a bag type dust collector design pressure.
7, filtration velocity
The filtration rate is the design and selection of bag type dust collector in the important factor, which is defined as the filtration of gas through the filter speed, or through the filter material and filter material flow area ratio. Unit using M / min to represent.
Bag dust collector filter area, then the volume size depends on the filtration speed selected, the formula for:
Q = V * s * 60 ( m3 / h )
Type : Q - Volume
V - filtration velocity ( M / min )
S - total filtration area ( M2 )
Note: the filtration area ( M2 ) = volume ( m3 / h ) / ( filtration velocity ( M / min ) X60 )
Bag type dust collector filter speed hairy filtering velocity and the net filtration speed, the so-called wool filtration rate refers to the volume set with bag dust collector of total filtration area, while the net filtration rate refers to the volume set with bag dust collector net filtration area.
In order to improve the dust removing effect and the continuous working ability, in the design of the bag dust collector is divided into several rooms ( or area), each chamber has a main valve to control the chamber in a filter or stop filter state (online or offline ). When a chamber for cleaning or repair, must make the main valve is closed and stopped at a filter state ( offline ), this volume consists entirely of other room burden, other rooms total filtration area called the net filtration area. That is to say, the net filtration area is equal to the total area of the filter is subtracted from the operation of the cleaning chamber is required to maintain and repair room number the sum of the filter area.
In 8, the ratio of length to diameter
The ratio of length to diameter is the bag length and diameter ratio. The ratio of length to diameter shall be as follows:
Back blowing type - 30 - 40
Mechanical shaking type - 15 - 35
Pulse flushing type - 18 - 23
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