What is the difference between wet electrostatic precipitator and dry electrostatic precipitator is

Dust collector equipment can be divided into two categories: Dry dust collector equipment: inertial dust collector, electrostatic precipitator, bag dust collector, cyclone dust collector.

Wet dust collector equipment: spray tower, impact dust collector, venturi dust collector, foam dust collector and water film dust collector, etc. At present, cyclone dust collectors, electrostatic precipitators and bag filters are widely used.

Puhua Technology will introduce to you today a variety of wet dust collector equipment represented by Venturi.

1. Spray tower washing dust collector

In a counter-flow spray tower, the dusty gas moves upwards and the droplets are ejected from the nozzle and move downward. Due to the inertial collision, interception and condensation between the droplets and the particles, the larger particles are trapped by the droplets. The spray tower has the characteristics of simple structure, small pressure loss, stable operation, etc., and is often used in conjunction with high-efficiency scrubbers to capture particles with larger particle size.

2. Venturi dust collector

It is mainly composed of a venturi and a cyclone. The dusty gas enters the shrink tube and is atomized by the high-velocity air current. The dust particles in the gas are lubricated in contact with the droplets.

After entering the expansion tube, the flow rate gradually decreases, and the dust particles adhere to each other, so that the particles increase and are easy to remove. Finally, it enters the cyclone separator, due to the action of centrifugal force, the water and lubricated dust particles are thrown onto the inner wall of the separator and flow down to the outside of the separator, and the purified gas is discharged by the ** pipe of the separator. The venturi scrubber has a simple structure, high dust removal efficiency, and has a cooling effect in addition to dust removal.

3. Impact dust collector

The impact water bath dust collector has a good purification and dust removal effect on industrial waste gas with high humidity, large emissions and large dust content. It is especially suitable for purifying non-fibrous, non-corrosive dusty gases with a temperature of no higher than 300°. Dust removal in viscous quicklime transport systems yields good results.

4. Water film dust collector

The dust-containing gas is used to impact the inner wall of the dust collector, so that the dust is captured by the water film and the gas is purified, and this kind of purification equipment is called a water film dust collector. Including impact water film, inert (louver) water film and centrifugal water film dust collector and so on. The structure of the water film dust collector is simple, the metal consumption is small, and the water consumption is small.

Its disadvantages are that the height is large, the layout is difficult, and the phenomenon of water is found in actual operation.

5. Foam dust collector

The dust-laden gas enters the lower cylinder from the air inlet, turns sharply upward, and the larger dust particles are separated from the air flow and fall into the lower cone due to inertia. The upward movement of the air and the water entering from the inlet collide through the sieve plate, and some of the dust particles are carried away by the water. When the air flow passes through the small holes in the sieve plate, the air and water are fully contacted, forming a boiling foam layer on the sieve plate, and most of the dust particles are washed.

The purified gas is removed by the water mist through the baffle and discharged through the exhaust port.

The main principle of these two devices is to release static electricity to adsorb dust on the plates.

However, dust and particulate matter adsorbed on the plates need to be treated.

Therefore, the dry precipitator uses vibration to reduce dust, and the wet electrostatic precipitator uses a spray system to flush dust and particulate matter down.

In this way, the wet type needs to be fitted with a water treatment unit.

However, the dry precipitator occupies a larger area, and the dust treatment concentration limit is worse than that of the wet electrostatic precipitator, and the service life is shorter.

Pollution control is relatively narrow and can only treat part of the smoke and dust, while the wet electrostatic precipitator has a wide range of applications.

Summary. I have helped you find the results: Is the wet electrostatic precipitator a special equipment?

Yes, a wet electrostatic precipitator is a secondary dust removal equipment that is added after the primary dust collector and wet desulfurization. The wet electrostatic precipitator technology used to control the smoke and dust in the flue gas of coal-fired power plants is the first in the chemical industry.

I have helped you find the result: Is the wet electrostatic precipitator a special equipment: Yes, the wet electrostatic precipitator is a kind of secondary dust removal equipment added after the primary dust collector and wet desulfurization.

The wet electrostatic precipitator technology used to control the smoke and dust in the flue gas of coal-fired power plants is the first to imitate the collar and cover fiber domain of the collar of the Hongshan.

The capture process of charged dust in the wet electrostatic precipitator: on the two metal anodes and cathodes with large differences in the radius of curvature, an electric field sufficient to ionize the gas is maintained through high-voltage direct current, and the electrons: anions and cations generated after the ionization of the gas are adsorbed on the dust through the electric field, so that the dust obtains an electric charge.

Under the action of electric field force, the dust with different polarity moves to the electrodes of different polarity and is deposited on the electrode, so as to achieve the separation of dust and gas. In accordance with the principle of repulsion of the same sex and attraction of the opposite sex, the dust and acid mist after the charge will move to the electrode that is opposite to the polarity. The particulate matter and acid mist will be adsorbed on the anode wall, and the dust acid will be adsorbed on the anode plate through the spray tower system.

1) High dust removal efficiency, the initial dust removal efficiency can reach 99%, and it can capture fine dust below 1um;

2) The flue gas treatment volume is large, and it can be used in high temperature (up to 500), high pressure and high humidity (relative humidity up to 100%) and high sulfur content (sulfur more than 3%), which can be operated continuously and can be automated.

3) It has the characteristics of low resistance, and the pressure loss is only 100 200pa.

5) The electrostatic precipitator has a moderate cost and a long service life, at least 8-10 years of use; (6) The electrostatic precipitator runs stably, no condensation, no creepage, and the failure rate is very low; (7) The operating cost of electrostatic precipitator is low.

High dust removal efficiency;

The equipment resistance is small, and the total energy consumption is low;

Wide range of applications;

It can handle flue gas with large air volume;

The one-time investment is larger.

Electrostatic precipitators are mainly used in the following fields:

1. Iron and steel industry.

Electrostatic precipitators are mainly used in the iron and steel industry to purify the exhaust gas of sintering machines, iron-making furnaces, cast iron cupolas, and coke ovens.

2. Coal-fired power plants.

Electrostatic precipitator for fly ash in coal-fired power plants.

3. Other industries.

The application of electrostatic precipitators in the cement industry is also quite common, and most of the rotary kilns and dryers of newly built large and medium-sized cement plants are equipped with electrostatic precipitators. Dust sources such as cement mills and coal mills can be controlled by electrostatic precipitators. Electrostatic precipitators are also widely used in acid mist in the chemical industry, flue gas treatment in the non-ferrous metallurgical industry and particulate matter.

Pros:

The purification efficiency is high, and it can accumulate fine particles of dust above microns. Different operating parameters can be used in the design to meet the required purification efficiency.

The resistance loss is small, generally below 20 mm water column, and compared with the cyclone dust collector, even if the power consumption of the power supply unit and the rapping mechanism is considered, its total power consumption is still relatively small.

The permissible operating temperature is high, such as the SHWB circuit dust preferably 250 operating temperature, and other types can reach 350 400 or higher.

Large range of gases to be processed.

Automatic control of the operation can be fully realized.

Cons:

The equipment is relatively complex, requiring a high level of equipment dispatch, installation and maintenance management.

There are certain requirements for the specific resistance of dust, so there is a certain selectivity for dust, and all dust can not obtain high purification efficiency.

Affected by the operating conditions such as gas body temperature and temperature, the same kind of dust is operated at different temperatures and humidity, and the effect obtained is different, and some dust works very well at a certain temperature and humidity, and the electrostatic precipitator can hardly be used due to the change of dust resistance at another temperature and humidity.

Electrostatic precipitator is one of the gas dust removal methods. When the dust-containing gas passes through the high-voltage electrostatic field, it is electroelectrically separated, and the dust particles are combined with negative ions to carry negative electricity, and tend to discharge on the surface of the anode and be deposited. It is used in metallurgy, chemical and other industries to purify gases or useful dust particles.

A dust collection method that ionizes a gas using an electrostatic field so that dust particles are electrically adsorbed onto the electrode. In a strong electric field, air molecules are ionized into positive ions and electrons, and the electrons encounter dust particles in the process of running to the positive electrode, so that the dust particles are negatively adsorbed to the positive electrode and collected. Of course, through technological innovation, there are also ways to collect dust from negative plates.

In the past, it was often used in coal-fueled factories and power stations to collect coal ash and dust from flue gas. In metallurgy, it is used to collect oxides such as tin, zinc, lead, aluminum, etc., and there are also dust and sterilization products that can be used for household use.

Advantages: (1) The initial dust removal efficiency can reach 99%, which can capture fine dust below 1um, but from the economic aspect, a reasonable dust removal efficiency is generally controlled. (2) The flue gas can be processed in large quantities, which can be used in high temperature (up to 500), high pressure and high humidity (relative humidity up to 100%), can operate continuously, and can be automated.

3) It has the characteristics of low resistance, and the pressure loss of the electrostatic precipitator is only 100 200Pa.

Disadvantages: (1) The equipment is huge, the steel consumption is more, and the high-voltage substation and rectifier equipment are required, and the output peak voltage of the high-voltage power supply equipment is usually 70 100kV, so the investment is high. (2) The technical level of manufacturing, installation and management is high.

3) The dust removal efficiency is greatly affected by the specific resistance of the dust, and the dust with the contrast resistance is generally less than 104 105 ·cm or greater than 1010 1011 ·cm, if certain measures are not taken, the dust removal efficiency will be affected. (4) A pretreatment device should be set up for dust-containing gases with an initial concentration greater than 30g cm3. (5) It does not have the function of offline maintenance, once the equipment fails, or runs with illness, or can only stop the furnace for maintenance.

The electrostatic precipitator has a good dust removal effect, up to more than 99%, and most of the models of FSD-high-efficiency electrostatic precipitator can even achieve the ideal effect of dust-free, smoke-free and fog-free;

2) The electrostatic precipitator has a moderate cost and a long service life, at least 8-10 years of use;

3) The electrostatic precipitator runs stably, no condensation, no creepage, and the failure rate is extremely low;

4) The operating cost of electrostatic precipitator is low.