CN206027932U - Wet -type electrostatic dust collector - Google Patents

Abstract

The utility model discloses a wet electrostatic precipitator, which comprises a casing, a cathode line and a dust collection pole tube; the cathode line is fixed at the center of the dust collection pole tube, the cathode line is externally connected to a high-voltage power supply, and the high-voltage power supply is introduced into the cathode line through an insulator chamber. There is an insulating sealing sleeve on the body, and the insulating sealing sleeve is used to fix the dust collecting pole tube at the upper and lower ends; the dust collecting pole tube is fixed inside the shell, and the inner wall of the dust collecting pole tube is covered with fibers for uniform water film distribution The upper end of the dust collector tube is provided with a water distributor for uniform water film distribution; the lower part of the shell is provided with a flue gas inlet and a sewage outlet, and the upper part of the shell is provided with a flue gas outlet. The dust collection pole tube is a conductive glass fiber reinforced plastic anode tube, and the section of the dust collection pole tube is a regular hexagon with rounded corners, and is arranged in a honeycomb shape inside the shell. The utility model can guarantee the uniformity of the water flow on the dust collecting pole plate, the reliability of the discharge of the cathode line, the corrosion resistance of the dust collecting pole tube, and can ensure the efficiency of washing and the stability of operation, thereby improving the efficiency of dust removal.

Description

A wet electrostatic precipitator

technical field

The utility model belongs to the technical field of environmental protection, in particular to a wet electrostatic precipitator.

Background technique

In recent years, environmental protection requirements at home and abroad have become higher and higher. All kinds of petrochemical tail gas and furnace flue gas must be discharged after dedusting and desulfurization. At present, the process of wet dedusting and desulfurization is still a reliable mainstream process. However, the currently commonly used wet dedusting and desulfurization treatment emits flue gas with high humidity, dust and foam content, white smoke and tailing phenomenon are serious. In order to reduce the phenomenon of white smoke and trailing from the chimney, the flue gas after wet dedusting and desulfurization treatment must be treated by an electrostatic precipitator or a wet electrostatic precipitator before being discharged from the chimney.

Electrostatic precipitator is an industrial equipment that relies on electrostatic force to collect the above-mentioned dust. Its work includes the following processes: (1) The high voltage from the high-voltage power supply is applied to the corona wire, and the corona wire generates corona discharge and forms an electric field; (2) The dust in the flue gas flowing through the electric field is charged by the electric field The ion charge generated by corona discharge; (3) The charged dust is collected on the dust collecting plate under the action of the electric field force; (4) The dust collected on the dust collecting plate is separated from the plate. According to the way the dust is separated from the plate, the electrostatic precipitator is divided into two types: dry type and wet type. The dry electrostatic precipitator removes the dust by vibrating or rotating the brush, and the wet electrostatic precipitator removes the dust by means of a flowing water film.

As a terminal purification equipment, the wet electrostatic precipitator uses high-voltage discharge to collect the dust in the flue gas on the plate, and uses the water film to remove the dust collected on the plate. It has a very good removal effect on fine particulate matter (PM2.5 dust, SO3 acid mist, aerosol), heavy metals (Hg, As, Se, Pb, Cr), organic pollutants (polycyclic aromatic hydrocarbons, dioxins) and other particulate matter , can control its emission from the source, and is widely used in waste gas treatment in industries such as electric power, steel, chemical, textile, cement, ceramics and glass, and can effectively solve the problems of gypsum rain, blue smoke plume or white smoke, and the effect is very significant.

However, the traditional wet electrostatic precipitator has the following disadvantages: 1. The corona intensity of the traditional plate electrode, wire electrode and rod electrode is not high enough, and it is necessary to increase the voltage to obtain a high dust collection rate and prevent arc extinction; 2. .Usually the acid gas forms dilute acid between the plate and the water film after being captured. The dilute acid will corrode the equipment and affect the service life; 3. The distribution of the gas flow between the electrodes is uneven, and there are even "dead angles", which reduces the Dust collection efficiency; 4. The traditional circular electrode tube has the problem of being difficult to maintain accurate concentricity, which makes the electric field uneven, which easily causes frequent electric sparks and affects the overall dust collection effect; 5. Usually the nozzles of the spray layer are only set in the electrostatic dust On the upper end of the component, the distribution of the nozzle position is usually relatively simple, and it is easy to produce a spray dead angle. In addition, the rinse water film cloth formed by the nozzle is not uniform on the surface of the dust collector, and it is easy to form groove-like water flow and spot stains. Electrode failure occurs after fouling builds up. Due to the unevenness of the flushing water film, it is necessary to install the flue gas humidification spray at the lower end of the dust removal component. Although the problem of uneven water film is made up for, it is easy to form a phenomenon of corona sealing; and the mist nozzle can achieve a more uniform flushing water film , but it is easy to form conductive small droplets, resulting in a short circuit of the electric field.

Therefore, those skilled in the art urgently need to provide a wet electrostatic precipitator that can ensure the uniformity of the water flow on the dust collecting electrode tube, the reliability of the discharge of the cathode line, and the operation stability, thereby improving the dust removal efficiency.

Utility model content

Aiming at the deficiencies in the above-mentioned prior art, the utility model provides a wet electrostatic precipitator which can ensure the uniformity of the water flow on the dust collecting electrode tube, the reliability of the discharge of the cathode line, and the stability of the operation, thereby improving the efficiency of dust removal.

In order to achieve the above object, the utility model adopts the following technical solutions:

A wet electrostatic precipitator, comprising a housing, a cathode wire and a dust collection pole tube; the cathode line is fixed at the center of the dust collection pole tube, the cathode line is externally connected to a high-voltage power supply, and the high-voltage power supply is introduced into the cathode line through an insulator chamber. The casing is provided with an insulating sealing sleeve, and the insulating sealing sleeve is used to fix the dust collecting pole tube at the upper and lower ends at the same time; the dust collecting pole tube is fixed inside the housing, and the inner wall of the dust collecting pole tube is covered to realize The fiber cloth with uniform water film distribution, the upper end of the dust collector tube is provided with a water distributor for realizing uniform water film distribution; the lower part of the housing is provided with a smoke inlet and a sewage outlet, and the upper part of the housing is provided with a smoke outlet.

Preferably, the dust collector tube is a conductive glass fiber reinforced plastic anode tube.

Further, the section of the dust collection pole tube is a regular hexagon with rounded corners, and the dust collection pole tubes are arranged in a honeycomb shape inside the housing.

Further, an air flow distribution plate is provided at the flue gas inlet in the housing.

Further, the airflow distribution plate, the dust collection pole tube, and the insulating sealing sleeve are all made of glass fiber reinforced plastic composite corrosion-resistant material.

Preferably, a grid plate is fixed at the bottom of the dust collection pole tube in the housing, and a grid hole corresponding to the central axis of each pole tube inner cavity is provided on the grid plate, and the lower end of the cathode wire passes through Through the grid hole, the end of the cathode wire is fixed on the grid plate.

Preferably, the cathode wire is RSB barbed wire.

Preferably, the fiber cloth is made of polypropylene fiber fabric or polyphenylene sulfide fiber fabric or polytetrafluoroethylene fiber fabric or high silica fiber fabric.

Preferably, the water distributor is connected with a PLC for controlling the water distribution valve to adjust the water distribution amount.

The beneficial effects of the utility model are:

The wet electrostatic precipitator provided by the utility model can ensure the uniformity of the water flow on the dust collection plate, the reliability of the discharge of the cathode line, the corrosion resistance of the dust collection pole tube, and can ensure the efficiency of washing and the stability of operation, thereby improving Dust removal efficiency.

Description of drawings

Fig. 1 is a schematic diagram of the structure of the utility model.

The meanings of the marked symbols in the figure are as follows:

1-housing 10-insulation sealing sleeve 11-flue gas inlet 12-sewage outlet

13-Flue gas outlet 14-Air distribution plate 2-Cathode line 20-Cathode frame line

3- Dust collector tube 4- High voltage power supply 5- Insulator chamber 6- Water distributor

60-Water distribution valve 61-Water distribution pipeline 7-Grille

detailed description

The technical solution in the utility model will be clearly and completely described below in combination with the drawings in the embodiments of the utility model. The following examples are only used to illustrate the technical solution of the utility model more clearly, but not to limit the protection scope of the utility model.

As shown in Figure 1, it is a wet electrostatic precipitator, including a housing 1, a cathode line 2 and a dust collecting pole tube 3; the cathode line 2 is fixed at the center of the dust collecting pole tube 3, and the cathode line 2 is externally connected to a high voltage power supply 4, The high-voltage power supply 4 is introduced into the cathode line 2 through the insulator chamber 5, and the bottom and top of the housing 1 are provided with insulating sealing sleeves 10, and the insulating sealing sleeves 10 are used to fix the dust collecting electrode tube 3 at the upper and lower ends, and effectively prevent the airflow from escaping. Prevent the air flow from passing through the non-electric field area and enter the outlet of the dust collector, thereby affecting the efficiency of the wet electrostatic precipitator; the dust collecting pole tube 3 is fixed inside the shell 1, and the inner wall of the dust collecting pole tube 3 is covered with fiber cloth for uniform water film distribution. The upper end of the dust collector tube 3 is provided with a water distributor 6 for uniform distribution of the water film;

Among them, the dust collection pole tube 3 is a conductive glass fiber reinforced plastic anode tube, which has light weight, high tensile strength, corrosion resistance, long service life, excellent electrical conductivity, small deformation affected by temperature, good rigidity, and no sharp edge on the edge of the pole plate. Glitch, not easy to produce partial discharge phenomenon.

The cross-section of the dust collection pole tube 3 is a regular hexagon with rounded corners, and the dust collection pole tube 3 is arranged in a honeycomb shape inside the housing 1 . The cross section of the dust collector tube 3 can also be a square with rounded corners or other shapes to avoid dust accumulation at the corners. The regular hexagonal dust collection pole tubes 3 arranged in a honeycomb pattern increase the dust collection area of the wet electrostatic precipitator compared with the plate dust collection, and improve the efficiency.

The flue gas inlet 11 in the casing 1 is provided with an air flow distribution plate 14 for evenly distributing the air flow, and it is also arranged inside the dust collector as an inspection platform.

Due to the acid gas contained in the treated flue gas, in order to prevent corrosion of the internal components of the wet electrostatic precipitator, the internal components of the precipitator, such as the air flow distribution plate 14, the dust collection pole tube 3, and the insulating sealing sleeve 10, are all made of FRP composite corrosion-resistant materials.

A grid plate 7 is provided at the bottom of the dust collection pole tube 3 in the housing 1, and a grid hole corresponding to the central axis of each pole tube cavity is provided on the grid plate 7, and the lower end of the cathode wire 2 passes through the grid. The grid hole, the end of the cathode line 2 is fixed on the grid plate 7; it can make the fixation of the cathode line 2 stable and reliable, thereby reducing the occurrence of swing and amplitude, preventing local short circuit, making the discharge uniform and stable, and improving the removal efficiency and power efficiency.

Among them, the cathode line 2 adopts RSB barbed wire; it not only has the advantages of continuous line, no deformation, no dust accumulation on the top and bottom of the thorn tip, and high discharge intensity of the traditional RS barbed wire, but also overcomes its poor discharge uniformity, and the average The disadvantage of weak electric field strength improves the uniformity of the density of the corona current, and the discharge orientation is more, avoiding the corona dead zone and enhancing the average current density, which can effectively improve the dust removal efficiency and improve the reliability of operation.

Fiber cloth adopts polypropylene fiber fabric or polyphenylene sulfide fiber fabric or polytetrafluoroethylene fiber fabric or high silica fiber. It can be selected according to specific working conditions. For example, the working temperature of polypropylene fiber fabric, polyphenylene sulfide fiber fabric and Teflon fiber fabric is about 110°C, and the high temperature resistant high-silica fiber can ensure that the equipment is kept at 180°C. work normally. At the upper end of the dust collector tube 3, the water flows downward under the action of gravity, and diffuses and infiltrates to the surroundings by using the fiber capillary effect. At the lower part of the water distribution hole about 300mm, the formed uniform water film spreads down to the bottom in a corrugated shape. A uniform water film is formed on the surface of the fiber cloth dust collecting pole tube.

The water distributor 6 is connected with a PLC for controlling the water distribution valve 60 to adjust the water distribution volume. The thickness of the water film can be adjusted in real time by the PLC-controlled water distribution valve 60 to adjust the flushing water volume and flushing time, so that the thickness of the water film can be uniform. Moreover, the design of the present invention has low requirements on flushing water volume, can be charged intermittently, removes flakes and falls off without secondary pollution, and can operate continuously and reliably for a long time.

The wet electrostatic precipitator of the utility model can be arranged vertically on the top of the desulfurization tower or at the rear of the desulfurization tower.

Below in conjunction with accompanying drawing, working process of the present utility model is described in detail as follows.

As shown in Figure 1, the flue gas enters the wet electrostatic precipitator through the air inlet 11, enters the electric field through the air distribution plate 14, and the high voltage from the high voltage power supply 4 is applied to the cathode line 2 through the insulator chamber 5 to form a high voltage electrostatic field .

The air flow passes through the electric field, and the dust is collected on the fiber cloth water film of the dust collecting pole plate 3 under the action of the electric field force, and the flushing water controlled by PLC flows to the inner wall of the dust collecting pole pipe 3 through the water distributor 60 and the water distribution pipeline 61 On the fiber cloth, flow down to form a uniform water film. With the extension of the adsorption process, a paste layer is formed on the surface of the fiber cloth dust collector, and the thickness of the water film gradually becomes thinner and drier. After a certain degree, it breaks and falls off in flakes, and is discharged through the sewage outlet 12; according to the thickness and shedding of the paste layer, the water distribution valve 60 of the water distributor 6 controlled by PLC adjusts the water distribution to form a water film again. The purified flue gas is discharged from the upper flue gas outlet 13, and the sewage is discharged from the lower sewage outlet 12 and flows into the sewage treatment system.

High-voltage power supply 4, cathode frame line 20, cathode line 2 and other energized equipment are cathodes, and 3 bundles of dust collecting pole tubes are reliably grounded as anodes.

The above is only the preferred embodiment of the utility model, it should be pointed out that for those of ordinary skill in the art, without departing from the technical principle of the utility model, some improvements and deformations can also be made. And deformation should also be regarded as the protection scope of the present utility model.

Claims (9)

1. a kind of wet cottrell, it is characterised in that：Including housing (1), cathode line (2) and pole pipe of gathering dust (3)；Described the moon Polar curve (2) is fixed on the center of pole pipe of gathering dust (3), and cathode line (2) external high voltage power supply (4), described high voltage power supply (4) pass through exhausted Edge seed cell (5) introduces cathode line (2), is provided with insulated enclosure set (10) on housing (1), and insulated enclosure set (10) while For fixing pole pipe of gathering dust in upper and lower ends；Pole pipe of gathering dust (3) are fixed on housing (1) inside, in pole pipe of gathering dust (3) Wall covers the fiber cloth for realizing uniform moisture film, and pole pipe of gathering dust (3) upper end is provided with the water-locator for realizing uniform moisture film (6)；Housing (1) bottom is provided with gas approach (11) and outlet of sewer (12), and housing (1) top is provided with exhanst gas outlet (13)。

2. a kind of wet cottrell according to claim 1, it is characterised in that：Described pole pipe of gathering dust (3) are conduction Fiberglass anode tube.

3. a kind of wet cottrell according to claim 2, it is characterised in that：The section of pole pipe of gathering dust (3) Regular hexagon in rounding, and pole pipe of gathering dust (3) is in honeycomb arrangement inside housing (1).

4. a kind of wet cottrell according to claim 2, it is characterised in that：Flue gas in housing (1) enters Mouth (11) place is provided with airflow-distribution board (14).

5. a kind of wet cottrell according to claim 4, it is characterised in that：Airflow-distribution board (14), receive Dirt pole pipe (3), insulated enclosure set (10) adopt fiberglass composite anticorrosive material.

6. a kind of wet cottrell according to claim 1, it is characterised in that：The dust collector pole in the housing (1) The bottom of pipe (3) is installed with flase floor (7), is provided with the lattice corresponding with every pole pipe lumen centers axis on flase floor (7) Gate hole, and described cathode line (2) lower end passes through the grate opening, cathode line (2) end fixes on the flase floor (7).

7. a kind of wet cottrell according to claim 1, it is characterised in that：Described cathode line (2) adopt RSB awns Thorn line.

8. a kind of wet cottrell according to claim 1, it is characterised in that：The fiber cloth is fine using polypropylene Dimensional fabric or polyphenylene sulfide fiber fabric or PTFE fiber fabric or high silica fiber fabric.

9. a kind of wet cottrell according to claim 1, it is characterised in that：It is connected with water-locator (6) The PLC of the cloth water yield is adjusted for controlling cloth penstock (60).