CN216879831U - Electric tar precipitator for roasting furnace - Google Patents

Abstract

The utility model relates to the technical field of environment-friendly and energy-saving equipment, in particular to an electric tar precipitator for a roasting furnace, which comprises an inlet flue, a filter box, a dust chamber, a high-frequency direct-current power supply and an outlet flue, wherein the inlet flue is connected to the front end of the dust chamber, the outlet flue is connected to the rear end of the dust chamber, the filter box is arranged in the inlet flue, and the high-frequency direct-current power supply for generating an electric field is arranged at the top of the dust chamber. The front-end filter box can adsorb tar/asphalt in smoke, reduce the electric field load of a subsequent electric tar precipitator, and the adsorbed tar can be recycled. The number of electric fields of electric capture can be correspondingly reduced on the whole, the shape of the electric field is correspondingly reduced, the installation floor area can be reduced, and the investment and the operation cost can be saved.

Description

Electric tar precipitator for roasting furnace

Technical Field

The utility model relates to the technical field of environment-friendly and energy-saving equipment, in particular to an electric tar precipitator for a roasting furnace, which is equipment suitable for precipitating tar pitch and dust in flue gas at an outlet of a quenching and tempering tower of a carbon roasting furnace in an electrolytic aluminum plant or in the similar field.

Background

Harmful substances including asphalt smoke, fluoride, dust and the like can be emitted in the production process of the carbon anode roasting furnace of the electrolytic aluminum plant, and the smoke of the carbon roasting furnace must be treated according to the requirements of GB25465-2010 aluminum industry pollutant emission standard and aluminum industry admission conditions (revised 2012) issued by the ministry of industry and informatization. At present, all large aluminum plants commonly adopt an electric tar precipitator system for treatment, wherein flue gas from a roasting furnace is firstly sprayed and cooled by a pervaporation tower, the temperature of waste gas is reduced to 90 +/-5 ℃, and then the waste gas enters the electric tar precipitator to collect tar and dust in the flue gas.

The electrical tar precipitator of the roasting furnace consists of a high-voltage electrostatic device (comprising a controller and a high-voltage generator) and a dust remover body. The inlet of the electrical tar precipitator is generally provided with an air flow uniform distribution plate, so that the uniform distribution of flue gas in an electric field is ensured, the vortex is reduced, and the electrical tar precipitator is favorable for exerting the purification capacity. When the air flow distribution plate is in operation, flue gas enters the polar plate after being stabilized by the inlet air flow distribution plate. The high voltage direct current forms a strong electric field between the electrode and the polar plate to ionize the smoke between the electrode and the polar plate, smoke particles and tar pitch suspended in the asphalt smoke are adsorbed on the polar plate under the action of the electric field force, and the mixture of the smoke particles and the tar pitch trapped on the dust collecting polar plate automatically flows to a bottom ash bucket along the polar plate under the action of gravity to be discharged. When the electrical tar precipitator operates for a period of time, the pressure difference between the inlet and the outlet reaches a set value, the polar plates need to be cleaned, and manual cleaning is needed when the blockage is serious.

With the improvement of environmental emission standards, electric fishing generally needs three electric fields. The initial investment and the operation cost of equipment are increased, the occupied area of the electric catcher is large due to the other three electric fields, and the arrangement of the electric catcher is difficult for the environmental protection reconstruction of the old roasting furnace. In addition, the tar mixture collected by the ash bucket of the electric tar precipitator is treated as hazardous waste, and needs to be recycled by special hazardous waste treatment enterprises, and carbon enterprises need to pay treatment cost.

SUMMERY OF THE UTILITY MODEL

The utility model provides an electric tar precipitator for a roasting furnace, which can recover part of tar and has small floor area.

In order to realize the purpose of the utility model, the technical scheme is that the electric tar precipitator for the roasting furnace comprises an inlet flue, a filter box, a dust removal chamber, a high-frequency direct-current power supply and an outlet flue, wherein the inlet flue is connected to the front end of the dust removal chamber, the outlet flue is connected to the rear end of the dust removal chamber, the filter box is arranged in the inlet flue, and the high-frequency direct-current power supply for generating an electric field is arranged at the top of the dust removal chamber.

As an optimized scheme of the utility model, the electric tar precipitator for the roasting furnace further comprises a corona electrode and an anode plate, an electric field is formed between the corona electrode and the anode plate under the action of a high-frequency direct-current power supply, the smoke passing through the anode plate is ionized, and smoke dust particles and tar pitch suspended in the smoke are adsorbed on the anode plate under the action of the electric field force.

As an optimized scheme of the utility model, the filter box comprises a feeding hole at the top and a discharging hole at the bottom.

As an optimized scheme of the utility model, the filter box is welded on the inlet flue through a wire mesh.

As the optimization scheme of the utility model, the number of the filter boxes is one or more.

As an optimized scheme of the utility model, a differential pressure meter is arranged in front of and behind the filter box.

As an optimized scheme of the utility model, the filter box is filled with porous coke blocks.

As an optimized scheme of the utility model, the diameter of the coke block is more than or equal to 5 mm.

As an optimized scheme of the utility model, the electric tar precipitator for the roasting furnace further comprises a discharging hopper which is arranged at the bottom of the dust removal chamber.

As an optimized scheme of the utility model, a discharge valve is arranged at the discharge position of the discharge hopper.

The utility model has the positive effects that: 1) the coke block in the adsorption device at the inlet of the electrical tar precipitator is of a porous structure, can adsorb part of tar/asphalt in the smoke, reduces the electric field load of the subsequent electrical tar precipitator, and can realize the recycling of the adsorbed tar. The number of electric fields of electric catching can be correspondingly reduced on the whole, the external shape of the electric catching device is correspondingly reduced, the installation floor area can be reduced, and the investment and the operation cost can be saved;

2) the tar mixture collected from the discharge port of the utility model belongs to hazardous waste, and the tar mixture adsorbed by the filter box is discharged along with coke blocks and finally returns to the roasting system, thereby realizing the recycling of part of hazardous waste;

3) the utility model can reduce the periodic cleaning times of the polar plate of the electric tar precipitator.

Drawings

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

FIG. 1 is a schematic view of an adsorption scheme of the present invention;

FIG. 2 is a schematic diagram of the dust removal process of the present invention.

Wherein: 1. the device comprises an inlet flue, 2, a filter box, 3, a dust removal chamber, 4, a high-frequency direct-current power supply, 5, an outlet flue, 6, a corona electrode, 7, an anode plate, 8, a blanking hopper, 9, a discharge valve, 21, a feeding port, 22 and a discharging port.

Detailed Description

As shown in figure 1, the utility model discloses an electric tar precipitator for a roasting furnace, which comprises an inlet flue 1, a filter box 2, a dust removal chamber 3, a high-frequency direct-current power supply 4 and an outlet flue 5, wherein the inlet flue 1 is connected to the front end of the dust removal chamber 3, the outlet flue 5 is connected to the rear end of the dust removal chamber 3, the filter box 2 is arranged in the inlet flue 1, and the high-frequency direct-current power supply 4 for generating an electric field is arranged at the top of the dust removal chamber 3. Wherein, the filter box 2 is a vertical filter box, one or more filter boxes 2 can be arranged according to the tar content of the inlet flue gas, each box body is about 20cm wide, and the inside is filled with the coke block of the calcining furnace as the adsorption raw material. The coke blocks of the calcining furnace are obtained by screening, the diameter of each coke block is not less than 5mm, and the calcined coke blocks have a porous structure and can effectively adsorb tar, asphalt, water vapor and the like in the flue gas. A differential pressure meter is arranged in front of and behind the filter tank 2, and when the differential pressure exceeds a set value (200Pa), the coke block in the tank body is replaced. The coke cake can be fed by a bucket elevator from an upper feed inlet 21 and discharged by a lower discharge outlet 22 to be returned to the raw material of the roasting furnace process. Therefore, the tar adsorbed on the coke blocks is recycled, and the amount of discharged hazardous wastes is reduced.

The two sets of vertical filter boxes 2 are arranged in front of and behind the conical inlet flue 1 in the figure 1, the filter boxes 2 are welded on the inlet flue 1 through silk screens, and the pore size of each silk screen is 3 mm.

The electric tar precipitator for the roasting furnace further comprises a corona electrode 6 and an anode plate 7, an electric field is formed between the corona electrode 6 and the anode plate 7 under the action of the high-frequency direct-current power supply 4, the smoke passing through the anode plate 7 is ionized, and smoke particles and tar pitch suspended in the smoke are adsorbed on the anode plate 7 under the action of the electric field force. Because the adsorption of front end, pollutant concentration such as tar in the flue gas reduces, consequently can set up 2 electric fields in subsequent clean room 3, every electric field is equipped with one set of high frequency direct current power supply unit. Therefore, the initial investment and the operating cost of the equipment can be reduced, the occupied area is correspondingly reduced, and the improvement of the roasting furnace is particularly facilitated. When the device runs, smoke enters the polar plate, high-voltage direct current forms a strong electric field between the corona electrode 6 and the anode plate 7, so that the smoke between the corona electrode 6 and the anode plate 7 is ionized, smoke particles and tar pitch suspended in asphalt smoke are adsorbed on the anode plate 7 under the action of the electric field force, and tar mixture enriched on the anode plate 7 automatically flows to the bottom discharging hopper 8 under the action of gravity to be discharged. When the pressure difference of the inlet and the outlet of the electrical tar precipitator reaches a set value, the polar plates need to be cleaned, and steam is generally used for heating between chambers to melt the tar mixture so as to achieve the purpose of self-flowing.

The adsorption process of the filter box is specifically implemented as shown in figure 1, the adsorption coke block comes from the raw material of a calcining furnace, and before operation, the adsorption coke block can be fed into the filter box 2 from an upper feed inlet 21 by a bucket elevator. When the device is in operation, tar and asphalt smoke of the roasting furnace cooled by the pervaporation tower sequentially enters the front filter box 2 and the rear filter box 2 from the inlet flue 1, the smoke is in contact with coke blocks in the filter boxes 2 and penetrates through gaps, and part of tar and asphalt in the smoke is captured and adsorbed by the coke blocks and then enters the dust removal chamber 3. When the pressure difference between the inlet and the outlet of the filter box 2 reaches an alarm set value (200Pa), the bottom discharge hole 22 is opened to send the coke blocks back to the calcining system, and the upper feed hole 21 is opened to add new coke blocks.

The dust removal process is specifically implemented as shown in fig. 2, the flue gas sequentially enters a filter box 2 through an inlet flue 1, part of tar and asphalt are adsorbed and then enter a dust removal chamber 3, a high-frequency direct-current power supply 4 is arranged on the upper portion of the dust removal chamber 3, a corona electrode 6 and an anode plate 7 are arranged inside the dust removal chamber, an electric field is formed in the dust removal chamber 3 when the high-frequency direct-current power supply 4 works, the flue gas passing through the anode plate 7 is ionized, and mixtures of tar, asphalt, dust and the like in the flue gas move and are adsorbed on the anode plate 7 under the action of the electric field. When the mass of the tar mixture increases to be greater than its cohesion, it flows under the action of gravity into the discharge hopper 8 and is periodically discharged by the bottom discharge valve 9. The flue gas after dust removal leaves from the outlet flue 5 and enters the subsequent treatment process.

The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. An electric tar precipitator for a roasting furnace is characterized in that: including entry flue (1), rose box (2), clean room (3), high frequency DC power supply (4) and export flue (5), entry flue (1) connect the front end at clean room (3), export flue (5) connect the rear end at clean room (3), rose box (2) set up in entry flue (1) for high frequency DC power supply (4) that produce the electric field set up the top at clean room (3).

2. An electrical tar precipitator for a roasting furnace according to claim 1, wherein: the electric tar precipitator for the roasting furnace further comprises a corona electrode (6) and an anode plate (7), an electric field is formed between the corona electrode (6) and the anode plate (7) under the action of a high-frequency direct-current power supply (4), smoke passing through the anode plate (7) is ionized, and smoke particles and tar pitch suspended in the smoke are adsorbed on the anode plate (7) under the action of the electric field force.

3. An electrical tar precipitator for a roasting furnace according to claim 2, wherein: the filter box (2) comprises a feed inlet (21) at the top and a discharge outlet (22) at the bottom.

4. An electrical tar precipitator for a roasting furnace according to claim 3, wherein: the filter box (2) is welded on the inlet flue (1) through a wire mesh.

5. An electrical tar precipitator for a roasting furnace according to claim 3, wherein: one or more filter boxes (2) are provided.

6. An electrical tar precipitator for a roasting furnace according to claim 3, wherein: a differential pressure meter is arranged in front of and behind the filter tank (2).

7. An electrical tar precipitator for a roasting furnace according to claim 3, wherein: the filter box (2) is filled with porous coke blocks.

8. An electrical tar precipitator for a roasting furnace according to claim 7, wherein: the diameter of the coke block is more than or equal to 5 mm.

9. An electrical tar precipitator for a roasting furnace according to claim 3, wherein: the electric tar precipitator for the roasting furnace further comprises a discharging hopper (8), and the discharging hopper (8) is arranged at the bottom of the dust removal chamber (3).

10. An electrical tar precipitator for a roasting furnace according to any of claims 1 to 9, wherein: a discharge valve (9) is arranged at the discharge position of the discharge hopper (8).

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