CN201949765U - Electrostatic bag dust collector - Google Patents

Abstract

The utility model discloses a novel electrostatic bag dust collector, which organically combines the electrostatic dust collector and the bag dust collector in the same air chamber, the electrostatic part (discharging electrode and dust collecting electrode) and the filter bag part Arranged alternately. The flue gas passes through the electric field first, and most of the particles carried by the flue gas are adsorbed on the dust collecting plate before reaching the filter bag, and the preliminarily purified flue gas flows to the filter bag through the gap of the dust collecting plate, and the flue gas is further purified by filtration . When the filter bag is cleaned, the electric field can effectively prevent the filter bag from reattaching to the dust. Greatly reduces the possibility of dust being re-entrained onto the filter bag. The utility model is efficient, compact, capable of capturing fine particles of PM2.5, has the ability to synergistically remove other pollutants, and has low resistance, significantly improves the filtering wind speed of the filter bag, and is also suitable for the transformation of the electrostatic precipitator; In the future, new types of dust collectors with great potential will be developed.

Description

An electric bag dust collector

technical field

The utility model belongs to the field of dust removal equipment for air pollution control, in particular to an electric bag dust collector.

Background technique

At present, the dust removal equipment for air pollution control mainly includes electrostatic precipitator, bag filter and front electric back bag filter.

Among them, the electrostatic precipitator has the advantages of high dust removal efficiency, low running resistance, simple operation, and less operation and maintenance. However, the dust removal performance of the electrostatic precipitator is greatly affected by the physical and chemical characteristics of the dust, and it is not ideal for the application of high specific resistance dust, fine dust and high viscosity dust. In order to improve the dust removal efficiency, it is necessary to greatly increase the dust collection area, which will inevitably lead to a large investment, and even cannot be used normally under some special conditions.

The efficiency of the bag filter is high, and the dust removal efficiency is not affected by the dust characteristics. When the bag filter is working, the dust discharge at the outlet is stable, and the discharge can be achieved. However, it has the problems of large running resistance, high power of the induced draft fan, high operating cost, limited life of the filter bag, and high cost of replacing the filter bag. At the same time, the bag filter has poor tolerance to high-temperature flue gas, and has strict requirements on the moisture content and oily content in the flue gas.

The front electrostatic precipitator and the rear bag filter combine the characteristics of the electrostatic precipitator and the bag filter. However, in the application, it is found that once the dust leaves the electric field area of the electrostatic precipitator, the electron neutralization speed of the dust is very fast, and the dust cannot produce the result of electrostatic effect in the filter bag area far away from the electric field. In order to overcome the above shortcomings, the electric bag The front-to-back arrangement is changed to a mixed arrangement, that is, the electric field part and the filter bag part are placed in the same flue gas area. No matter in the dust collection process or the dust settles to the ash hopper, the two can interact well, which not only greatly improves the dust removal Efficiency, significantly reduced drag, and compact structure, cost-effective.

Contents of the invention

The purpose of this utility model is to provide an electric bag dust collector which is not affected by dust characteristics and has low running resistance. The problem of repeated dust collection.

The utility model is realized through the following technical solutions: an electric bag dust collector, including a closed shell, a filter bag and an electric field located in the shell, and is characterized in that: the filter bag part includes a flower plate, a bag cage and a spray cleaning The ash device; the electric field part includes the anode plate and the discharge electrode, the rapping device and the power supply; the filter bag part and the electric field part each constitute a complete independent system, and the two are arranged in a staggered manner.

It includes a closed shell, a bag filter and an electrostatic precipitator in the shell, and multiple bag filters are arranged in parallel in the shell, and each bag filter consists of a set of filter bags and an anode on the side of the filter bag. plate and a baffle outside the filter bag at the entrance of the electrostatic bag filter, discharge electrodes are arranged between the anode plates, and a ventilation channel is provided on the anode plate, and the ventilation channel is the air inlet of the bag filter.

One type of the positive plate is a perforated plate, and the porosity is 30-60%.

The other type of anode plate is a strip plate, and the gap between the strip plates is 50-150mm.

The discharge is extremely prickly.

Each group of the filter bag area of the electrostatic precipitator consists of 1-3 filter bags arranged side by side.

The electrostatic precipitator also includes a vibration cleaning device or a sonic cleaning device.

The bag filter also includes a pulse cleaning device.

The utility model organically combines the two dust removal principles in the same air chamber by alternately arranging the static area (discharge electrode and dust collection plate) and the filter bag area, and fully utilizes the advantages of the electrostatic precipitator and the bag type dust collector. Use the electrostatic precipitator to collect coarse dust and charge the uncollected fine dust to reduce the dust concentration of bag dust removal. Then use the high-performance filtering characteristics of the bag filter to overcome the shortcomings of the electrostatic precipitator's insufficient collection of fine dust. The charged particles not collected by the electrostatic precipitator will flow to the filter bag through the gap or the porous plate, so that the dust layer on the surface of the filter bag is arranged in an orderly and loose manner, which improves the air permeability of the dust layer, thereby effectively reducing the running resistance and improving The life of the filter bag is extended, the operating cost is reduced, and the advantages of the two dust removal mechanisms are fully utilized. The utility model can capture the dust of 0.01 μm-1 μm, and the dust removal efficiency can reach 99.99%, or even higher. Because it is not affected by the specific resistance of dust, it is suitable for the purification of all industrial kiln dust, and can be used for the transformation of old dust collectors. It has a compact structure, can save space, and has strong practicability.

Description of drawings

Fig. 1 is the utility model schematic diagram of parallel single row filter bag;

Fig. 2 is the utility model schematic diagram of two rows of filter bags juxtaposed;

1. Baffle, 2. Puncture wire, 3. Anode plate, 4. Filter bag, 5. Housing.

Detailed ways

Further illustrate the utility model below in conjunction with accompanying drawing:

As shown in Fig. 1, the utility model includes a closed casing 5, and the electric field part and the filter bag part located in the casing 5 are included. These two parts are arranged alternately. After the flue gas enters the dust collector, the baffle 1 in front of the filter bag blocks the airflow from entering the filter bag area and guides the flue gas flow into the electric field. The anode 3 of the electric field part is arranged on both sides of the filter bag, and the discharge electrode 2 is between the anodes. The electric field cleans the dust Mechanical rapping, electromagnetic rapping or sonic cleaning is adopted, and the filter bag cleaning adopts a pulse valve cleaning device. The anode plate 3 of the anode plate part is a perforated pole plate or a strip plate. When the anode plate 3 is a perforated pole plate, the porosity is 30-60%. When the anode plate 3 is a strip plate, the strip plate The gap is 50-150mm.

After the flue gas enters the utility model, because the baffle plate 1 blocks the filter bag at the front end, the flue gas first passes through the electrostatic area with the barbed wire 2, and the air is ionized under the action of the high-voltage electric field. After the dust is charged, under the action of the electric field force, each of them moves to the opposite electrode according to the polarity of the charge. The preliminarily purified flue gas flows to the filter bag 4 through the holes or gaps of the anode plate 3 under the action of the induced draft fan, the dust not collected by the anode plate 3 is intercepted outside the filter bag, and the purified flue gas enters upward from the inside of the filter bag The clean air chamber then enters the chimney to complete the dust removal process. The anode plate 3 is cleaned by vibration or sound waves, and the filter bag 4 is cleaned by pulses.

The charged dust agglomerates on the surface of the filter bag 4, and the properties of the dust have changed. Part of the dust condenses into larger particles. Because the same-sex charged dust repels each other, the dust on the surface of the filter bag is arranged loosely and orderly, and the filtration resistance And cleaning resistance is significantly reduced. At the same time, when the filter bag is pulse-cleaned, the adjacent electric field can effectively capture the scattered dust, reducing the possibility of dust being entrained to the filter bag again, and greatly improving the working conditions of the filter bag. The utility model realizes that the resistance does not exceed 1500Pa when the air-to-cloth ratio is greater than or equal to 2m/min. Under the condition of processing the same gas volume, the number of filter bags, bag cages and pulse valves is less, which can reduce initial investment and operating costs. Moreover, the utility model has a higher trapping effect on PM2.5 fine dust, resulting in a lower outlet emission concentration, even up to no more than 30mg/Nm ³ , which meets the development requirements of air pollution prevention and control technology in the future.

As shown in Figure 2, the filter bags can also be arranged in two parallel rows or in parallel three rows according to the distance from the electric field outlet position. The principle and effect of the implementation are similar to the parallel single row arrangement.

Claims (8)

1. An electric bag dust collector, comprising a closed housing, a filter bag and an electric field positioned in the housing, is characterized in that: the filter bag part includes flower plates, bag cages and blowing dust cleaning devices; the electric field part includes anode plates and The discharge electrode, rapping device and power supply; the filter bag part and the electric field part each constitute a complete independent system, and the two are arranged in a staggered manner. 2. The electric bag dust collector according to claim 1, characterized in that: it comprises a closed housing, a bag filter and an electric dust collector located in the housing, and a plurality of bag filter are arranged in parallel in the housing, Each bag filter consists of a set of filter bags, an anode plate on the side of the filter bag and a baffle outside the filter bag at the entrance of the electric bag filter. Discharge electrodes are arranged between the anode plates. There is a ventilation channel, which is the air inlet of the bag filter. 3. The electric bag filter according to claim 1, characterized in that: the anode plate is a perforated plate, and the perforation rate is 30-60%. 4. The electric bag filter according to claim 1, characterized in that: the anode plates are strip plates, and the gap between the strip plates is 50-150mm. 5. The electric bag filter according to claim 1, characterized in that: the discharge pole is a prickly wire. 6. The electrostatic bag dust collector according to claim 1, characterized in that 1-3 filter bags are arranged side by side in the bag dust removal area and filter bags. 7. The electrostatic bag dust collector according to claim 1, characterized in that: the electric dust collector further comprises a vibration cleaning device or a sonic cleaning device. 8. The electrostatic bag filter according to claim 1, characterized in that: the bag filter also includes a pulse cleaning device.

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