When two dust collectors of the same model are running in series, how to calculate the dust removal

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.

If it's a cyclone.

Wet dust collectors can be connected in series, which can improve dust collection efficiency.

Bag filter.

If these two dust collectors cannot meet the emission standards, please consider whether the material of the ash cleaning, filter bag or filter cartridge and the filtration area are too small.

Under normal circumstances, the two units are connected in series, and the dust removal efficiency is 90%: the dust removal efficiency of the first unit is 90%, and the dust removal efficiency of the second unit is 90% of the dust concentration after the first unit removes 90%. But after our many field trials, we came to the conclusion that:

Both are connected in series with dust collectors with a dust removal efficiency of 90%, and the final dust removal efficiency can only reach about 95%.

Why do you want to run in series? Generally, it is run in parallel in order to increase the filtration area.

The efficiency of the cyclone increases with the inlet airflow velocity, and the resistance also increases with the inlet airflow velocity.

Therefore, if the efficiency of the dust collector is to be improved, the inlet air velocity must be increased, and the dust collector resistance must be increased.

If you want to reduce the resistance of the dust collector, you have to reduce the inlet air velocity, and the efficiency of the dust collector will be reduced accordingly.

This shows that in the selection of dust collectors, efficiency and energy saving are always contradictory and cannot be both.

8.There are two dust removal devices connected in series, and the second level dust removal efficiency is known to be, and the total dust removal efficiency is the <>

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<> to calculate the efficiency of two series dust removal devices, we can use the following formula: total efficiency = 1 - 1 - efficiency 1) 1 - efficiency 2) where efficiency 1 is the efficiency of the first stage dust removal device and efficiency 2 is the efficiency of the second stage dust removal device. According to the known conditions, the second level of dust collection efficiency is, and the total dust collection efficiency is.

Substituting these values into the formula, we can solve the efficiency of the first stage of the dust collector. = 1 - 1 - Efficiency1) 1 - By calculating, we can get the efficiency of the first stage of the dust collector by calculating the ridge height. Therefore, the efficiency of the first-stage dust removal device is, and the efficiency of the second-stage dust removal device is.

Answer]: A hint The classification efficiency refers to the dust removal efficiency of the dust removal device for a certain particle size or particle size separation, and for the same model of dust collector, the classification efficiency is the same. When the dust collector runs in series, due to the different particle companion search diameters of the dust they process, the dust removal efficiency of each is different, the first stage dust removal efficiency is high, and the second stage dust removal efficiency is low.

The efficiency of demilicate classification is not necessarily the same, but depends on a variety of factors, such as the collector model, operating status, matching method, etc. Arguments.

Under normal circumstances, the series classification dust collector can effectively improve the particulate matter removal rate of the whole system, even if the treatment efficiency of a single dust collector is low, it can further reduce the thickness of the dirt bench stove stain in the flue gas through the multi-stage series connection method on the premise of ensuring that the emission standard is met. However, there can also be some problems with a series graded dust collector, such as:

Increased pressure loss: Each dust collector will increase a certain resistance and pressure loss, and the total pressure loss will gradually increase after multi-stage series connection, which will affect the efficiency of the system.

Increased operating costs: Tandem classification requires multiple dust collectors to operate at the same time, which increases energy consumption and maintenance costs, especially when the demand for air pollution control is becoming more and more stringent, and the issue of operating costs needs to be considered.

Increased probability of failure: Multiple dust collectors interact with each other, and the probability of failure increases accordingly, making maintenance more difficult and costly.

Therefore, the selection and design of the demilide classification of the dust collector need to be weighed and optimized according to the specific situation, so as to avoid unnecessary problems and improve the efficiency and stability of the whole system.

The efficiency of a tandem multistage dust collector is determined by the product of the efficiency of each level, not the same for each level. In a multi-stage dust collector system, each level can remove a specific size of particles, but their efficiency depends on factors such as airflow velocity, particulate characteristics, collector materials, and design. Therefore, the efficiency of the system should be the product of the efficiency of each level.

Answer: Zheng Min]: c

The total efficiency of the dust removal system = 1-(1-80%) (1-90%) = 98%.

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The premise of calculating the dust removal efficiency of the cyclone usually includes the following points:

Determine the type of dust to be removed and the particle size distribution to be removed in order to determine the cyclone diameter and design parameters to be used in the collector.

Determine the inlet airflow velocity, which is usually determined by the velocity of the gas to be treated and the amount of megalead in the flow beam.

Determine the volume concentration of dust in the inlet gas in order to determine the design capacity of the cyclone.

Determine the length and height of the cyclone tube, as well as the length and pressure drop limits of the cyclone duct to ensure adequate rotation and efficient separation of the airflow within the equipment.

Determine the dust collection efficiency of the cyclone and the concentration of dust in the exhaust gas in order to evaluate the performance and cost-effectiveness of the equipment.

It should be noted that the dust removal efficiency of the cyclone dust collector is also affected by many influencing factors, such as airflow velocity, inlet and outlet shape, airflow pressure and temperature, etc., so the actual efficiency may be biased.