CN210993738U - Semidry flue gas desulfurization dust collector - Google Patents
Semidry flue gas desulfurization dust collector Download PDFInfo
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- CN210993738U CN210993738U CN201921201899.8U CN201921201899U CN210993738U CN 210993738 U CN210993738 U CN 210993738U CN 201921201899 U CN201921201899 U CN 201921201899U CN 210993738 U CN210993738 U CN 210993738U
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Abstract
The utility model discloses a semidry flue gas desulfurization dust collector, thereby realize the desulfurization through setting up the mixture that independent reactor is used for realizing desulfurizer and flue gas before every dust remover unit, the flue gas that adds the desulfurizer carries out the flue gas dust removal in the dust remover unit of rear end, finally realizes the desulfurization dust removal purification of flue gas. The utility model discloses a thereby the system is used for realizing the mixture of desulfurizer and flue gas through set up independent reactor before every dust remover unit and realizes the desulfurization, and the flue gas that adds the desulfurizer carries out the flue gas dust removal at the dust remover of rear end, finally realizes the desulfurization dust removal purification of flue gas.
Description
Technical Field
The utility model belongs to the technical field of flue gas purification, a flue gas desulfurization dust removal system and method are related to, especially relate to a flue gas desulfurization dust removal system and method of electrolysis aluminium trade electrolysis trough low concentration sulfur dioxide.
Background
The sulfur dioxide in the flue gas of the aluminum electrolysis cell mainly comes from the prebaked anode of the raw materials for production of the electrolysis cell, and the sulfur in the anode carbon block is oxidized into the sulfur dioxide to enter the electrolysis flue gas under the high-temperature environment in the electrolysis cell. According to the calculation, the concentration of sulfur dioxide in the electrolytic flue gas at the present stage is low and is mostly 200-350 mg/Nm 3. The flue gas of the electrolytic cell has the other characteristic of large flue gas volume which reaches about 70000Nm3/t aluminum. Therefore, compared with the desulfurization system applied in the power and steel industry, the flue gas of the aluminum electrolysis cell has the characteristics of large flue gas quantity and low sulfur dioxide concentration, so the main factor influencing the operation cost of the purification system is the system resistance.
The flue gas desulfurization of the electrolytic cell of the electrolytic aluminum enterprise at the present stage is mostly applied by a mature limestone-gypsum wet desulfurization technology applied in the power industry or a circulating fluidized bed semi-dry desulfurization technology using slaked lime as a desulfurizing agent, and the two technologies are relatively suitable for purifying high-concentration sulfur dioxide flue gas in the power industry, the steel industry and other industries. Particularly, in the circulating fluidized bed dry desulfurization technology, a circulating fluidized bed desulfurization tower needs to be separately arranged in front of a bag type dust collector, and the high flue gas flow velocity of a venturi throat is utilized to build a bed in the desulfurization tower to realize flue gas desulfurization and purification, so that the technology has high construction cost and large running resistance (reaching 3000-5000 Pa), and the technology is higher in running cost when being directly applied to the electrolytic aluminum industry.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a semidry flue gas desulfurization dust collector to solve above-mentioned technical problem.
The utility model adopts the following technical scheme:
a semidry flue gas desulfurization dust removal device comprises dust remover units and reactors, wherein the reactors are arranged on inlet vertical pipes of the dust remover units; a spray pipe for conveying a desulfurizer is arranged on the reactor, one end of the spray pipe is connected with a flue gas inlet outside the reactor, the other end of the spray pipe is led to the central position inside the reactor, a desulfurizer inlet is arranged on a pipe section of the spray pipe, which is positioned outside the reactor, and a nozzle is arranged at the joint of the spray pipe and the desulfurizer inlet; a diffusion device is arranged at the pipe orifice of the spray pipe in the reactor and is used for realizing the uniform distribution of the desulfurizer at the position of the cross section of the reactor; a water atomization spray gun is arranged below the diffusion device; the water mist sprayed out by the water atomization spray gun is radially sprayed out in the reactor.
The utility model discloses a thereby the system is used for realizing the mixture of desulfurizer and flue gas through set up independent reactor before every dust remover unit and realizes the desulfurization, and the flue gas that adds the desulfurizer carries out the flue gas dust removal at the dust remover of rear end, finally realizes the desulfurization dust removal purification of flue gas. Because the system does not need a circulating fluidized bed desulfurization tower in the traditional technology, the system has small occupied area, low construction cost and low running resistance, and the total resistance of the desulfurization system including a reactor and a dust remover is within 1500-2000 Pa. The method is suitable for the purification system of the aluminum cell flue gas or the similar flue gas with low sulfur dioxide concentration and large flue gas quantity.
The utility model discloses a concrete realization like this: a plurality of independent dust remover units are arranged according to the amount of the treated flue gas, and a reactor for mixing a desulfurizing agent with the flue gas to realize the desulfurization and purification of the flue gas is arranged on an air inlet pipeline of each dust remover unit. In the reactor, a desulfurizing agent (the desulfurizing agent can be slaked lime, quicklime and other alkaline substances capable of reacting with sulfur dioxide) and water required for realizing acid-base neutralization reaction are simultaneously added. The flue gas is mixed with a desulfurizer and water in the reactor for reaction, and then enters a dust remover for flue gas dust removal, and finally the flue gas is desulfurized, dedusted and purified.
Wherein, the reactor is a device for realizing the full mixing of the flue gas, the desulfurizer and the water. As the powdery desulfurizer is sprayed into the reactor in a pneumatic conveying mode, the flue gas and the desulfurizer can be rapidly mixed, so that the purification efficiency of the purification system on sulfur dioxide is ensured. Meanwhile, in order to ensure the full contact of water, sulfur dioxide and a desulfurizer and avoid the adhesion and blockage of downstream equipment and pipelines caused by the insufficient evaporation and vaporization of the sprayed water and the mixing of the desulfurizer, the water is sprayed into the flue gas by an atomizing spray gun, the diameter of liquid drops is controlled to be below 50 mu m, and the smaller the diameter of the liquid drops, the more favorable the desulfurization reaction is and the safety of the system is ensured.
In order to improve the mixing effect of the flue gas and the desulfurizer, the powdery desulfurizer takes the flue gas as power and is sprayed into the reactor, so that the premixing effect of the flue gas and the desulfurizer is achieved. The flue gas used for driving the desulfurizer is high-temperature flue gas extracted from an air inlet main pipe of the system, is filtered by a filter and then is pressurized by a pressurizing fan and sent to a desulfurizer nozzle flue gas inlet of the reactor. Meanwhile, the filtered flue gas can be used as a gas source of a pneumatic chute for conveying a desulfurizing agent and a desulfurization byproduct. By extracting high-temperature flue gas blowing desulfurizer to enter the reactor and serve as an air source of the pneumatic chute, the flue gas condensation caused by cold air entering a system can be avoided, or the energy of heating hot air by an air heater can be saved.
The reactor is cylindrical. A desulfurizer nozzle and a water atomization spray gun are arranged according to functional requirements. The desulfurizer is introduced to the central position of the reactor through the spray pipe, and the uniform distribution of the desulfurizer on the cross section of the reactor is realized through the diffusion device, so that the desulfurizer and the flue gas are fully mixed. The lower part of the diffusion device is provided with a water atomization spray gun. The water mist sprayed out by the water atomization spray gun is sprayed out in the radial direction of the reactor barrel. Under the action of the diffusion device and the wall of the reactor cylinder, an eddy current area can be formed at the wall of the cylinder, so that the mixing effect of the flue gas, the desulfurizer and the water mist is further ensured, and the desulfurization and purification efficiency of the purification system is ensured. And, since the reactor does not have a venturi device of the conventional reactor, the reactor resistance can be controlled below 300 Pa.
The diffusion device is provided with an expansion cavity, and the periphery of the bottom of the expansion cavity is provided with a strip seam. The flow rate of the desulfurizer is reduced after the desulfurizer enters the cavity and passes through the enlarged cavity, so that the mixture of the desulfurizer and the flue gas is sprayed out from the strip seam arranged at the periphery of the bottom under the action of pressure, and the uniform distribution of the desulfurizer at the cross section of the reactor is realized, so that the desulfurizer and the flue gas are fully mixed.
Following conduct the utility model discloses preferred technical scheme, nevertheless do not conduct the utility model provides a technical scheme's restriction, through following technical scheme, can be better reach and realize the utility model discloses a technical purpose and beneficial effect.
As the utility model discloses preferred technical scheme sets up flue gas damper before every reactor of clean system, has ensured that the flue gas volume that gets into every desulfurization reactor and dust remover unit is even unanimous. The desulfurizer is uniformly distributed into each reactor through a horizontal material distributing device, and uniform feeding of each reactor is realized.
The water supply of each reactor is supplied by a unified valve frame water supply system, and the valve frame water supply system is provided with a variable-frequency speed-regulating water pump and a flow regulating mechanism, so that the water spray quantity of the purification system can be regulated as required. Meanwhile, a hydraulic balance valve is arranged on each reactor water supply branch pipe to ensure the balance of the water injection quantity of each reactor.
Preferably, a circulating material control device is arranged at the lower part of each dust remover unit, so that the desulfurizer separated by the dust remover can be circularly fed into the reactor. The material quantity of the desulfurizer circularly fed into the reactor is controlled by the circulating material control device, so that the times that the desulfurizer reenters the reactor to participate in adsorption reaction can be increased, the concentration of the desulfurizer is increased, and the purification efficiency of the purification system on sulfur dioxide is improved.
Preferably, the desulfurization by-product discharged from the circulating material control means (which differs in accordance with the kind of desulfurization by-product of the desulfurizing agent) is transported to the storage bin through a by-product transport chute provided downstream of the circulating material control means.
Drawings
FIG. 1 is a process flow diagram of a flue gas desulfurization and dust removal system provided in embodiment 1 of the present invention;
FIG. 2 is a schematic diagram of the structure of the reactor of the present invention;
the labels in the figures are: 1-a dust remover unit, 2-an inlet vertical pipe, 3-a reactor, 4-a desulfurizer nozzle, 5-a desulfurizer inlet, 6-a flue gas inlet, 7-a reactor cylinder wall, 8-a water atomization spray gun, 9-a spray pipe, 10-a diffusion device, 11-an expansion cavity, 12-a tray, 13-a strip seam, 14-an air inlet main pipe, 15-a filter, 16-a pressurizing fan, 17-a flue gas adjusting valve, 18-a horizontal material distributing device, 19-a valve frame water supply system, 20-a hydraulic balance valve, 21-a circulating material control device and 22-a byproduct conveying chute.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted", "provided", "sleeved/connected", "connected", and the like are to be understood in a broad sense, such as "connected", which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The embodiment of the utility model provides a:
as shown in figure 1, clean system constitute such, according to the size of flue gas volumn, clean system sets up independent dust remover unit 1 of a plurality of according to what of handling flue gas volumn, on every dust remover unit entry riser 2, sets up a reactor 3, in reactor 3, drops into the desulfurizer (the desulfurizer can be the alkaline material that ability and sulfur dioxide reaction such as lime hydrate, quick lime) and realizes the water that acid-base neutralization reaction needs simultaneously. The flue gas is mixed with a desulfurizer and water in the reactor 3 for reaction, and then enters the dust remover unit 1 for flue gas dust removal, and finally the desulfurization, dust removal and purification of the flue gas are realized.
The reactor 3 is a device for realizing the full mixing of the flue gas, the desulfurizer and the water. The flue gas and the desulfurizer can be rapidly mixed, and the powdery desulfurizer is sprayed into the reactor 3 from the desulfurizer inlet 5 of the desulfurizer nozzle 4 in a pneumatic transmission mode, so that the purification efficiency of the purification system to sulfur dioxide is ensured. Meanwhile, in order to ensure the full contact of the water with the sulfur dioxide and the desulfurizer and avoid the adhesion and blockage of downstream equipment and pipelines caused by insufficient evaporation and vaporization of the sprayed water and the mixing of the desulfurizer, the water is sprayed into the flue gas by an atomizing spray gun 8.
The reactor 3 has a cylindrical outer cylindrical wall 7. The reactor 3 is provided with a desulfurizer nozzle 4 and a water atomization spray gun 8. The desulfurizer is led to the central position of the reactor through a spray pipe 9 behind the nozzle 4, and the uniform distribution of the desulfurizer at the cross section position of the reactor 3 is realized through a diffusion device 10, so that the full mixing of the desulfurizer and the flue gas is realized. The lower part of the diffusion device 10 is provided with a water atomization spray gun 8. The water mist sprayed by the water atomization spray gun 8 is radially sprayed out in the reactor 3. Under the action of the diffusion device 10 and the outer cylinder wall 7 of the reactor, a vortex region is formed around the diffusion device 10, so that the mixing effect of the flue gas, the desulfurizer and the water mist is further ensured, and the desulfurization and purification efficiency of the purification system is ensured. And, since the reactor 3 does not have a venturi device of the conventional circulating fluidized bed reactor, the reactor resistance can be controlled below 300 Pa.
The diffusion device 10 is provided with an enlarged cavity 11, and the enlarged cavity 11 and the periphery of a tray 12 arranged at the bottom are provided with slits 13. The flow rate of the desulfurizer is reduced after the desulfurizer enters the enlarged cavity 11, so that the desulfurizer is uniformly distributed in the cavity 11, and under the action of pressure, the mixture of the desulfurizer and the flue gas is sprayed out from the strip seam 13 at the bottom, so that the desulfurizer is uniformly distributed at the cross section of the reactor 3, and the desulfurizer and the flue gas are fully mixed.
The flue gas for driving the desulfurizer is high-temperature flue gas extracted from a system air inlet main pipe 14, is filtered by a filter 15, is pressurized by a pressurizing fan 16 and is conveyed to a desulfurizer nozzle 4 flue gas inlet 6 of the reactor 3, and is used for driving the desulfurizer added from a desulfurizer nozzle 4 desulfurizer inlet 5. Meanwhile, the filtered flue gas can be used as a gas source of a pneumatic chute for conveying a desulfurizing agent and a desulfurization byproduct. Through setting up the particulate matter that contains in the filter 15 filtration flue gas, can avoid pnematic chute ventilating plate to block up.
The flue gas adjusting valve 17 is arranged in front of each reactor 3 of the purification system, so that the uniform and consistent flue gas amount entering each desulfurization reactor 3 and the dust remover unit 1 is ensured.
The desulfurizer is uniformly distributed into each reactor 3 through the horizontal material distributing device 18, and uniform feeding of each reactor 3 is realized.
The water supplied by each reactor 3 is supplied by a unified valve frame water supply system 19, and a variable-frequency speed-regulating water pump and a flow regulating mechanism are arranged in the valve frame water supply system 19, so that the water spraying amount of the purification system can be regulated as required. Meanwhile, a hydraulic balance valve 20 is provided on the water supply branch pipe of each reactor 3 to ensure the balance of the amount of water sprayed from each reactor 3.
The lower part of each dust remover unit 1 is provided with a circulating material control device 21, so that the desulfurizer separated from the dust remover sub-unit 1 can be circularly put into the reactor 3 and a desulfurization byproduct is discharged. The material amount of the desulfurizer circularly fed into the reactor 3 is controlled by the circulating material control device 21, so that the number of times that the desulfurizer reenters the reactor 3 to participate in adsorption reaction can be increased, the concentration of the desulfurizer is increased, and the purification efficiency of the purification system on sulfur dioxide is improved.
The desulfurization by-product discharged from the circulation material control device 21 (which differs in accordance with the kind of desulfurization by-product of the desulfurizing agent) is transported to a storage bin through a by-product transport chute 22 provided downstream of the circulation material control device 21.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.
Claims (8)
1. The utility model provides a semidry process flue gas desulfurization dust collector which characterized in that: the device comprises dust collector units (1) and reactors (3), wherein the reactors (3) are arranged on inlet vertical pipes (2) of the dust collector units (1); a spray pipe (9) for conveying a desulfurizer is arranged on the reactor (3), one end of the spray pipe (9) is connected with a flue gas inlet (6) outside the reactor (3), the other end of the spray pipe is led to the central position inside the reactor (3), a desulfurizer inlet (5) is arranged on a pipe section of the spray pipe (9) outside the reactor (3), and a nozzle (4) is arranged at the joint of the spray pipe (9) and the desulfurizer inlet (5); a diffusion device (10) is arranged at the pipe orifice of the spray pipe (9) in the reactor (3) and is used for realizing the uniform distribution of the desulfurizer along the cross section of the reactor (3); a water atomization spray gun (8) is arranged below the diffusion device (10); the water mist sprayed out by the water atomization spray gun (8) is radially sprayed out in the reactor (3).
2. The semi-dry flue gas desulfurization and dust removal device according to claim 1, characterized in that: the reactor (3) has a cylindrical outer cylinder wall (7).
3. The semi-dry flue gas desulfurization and dust removal device according to claim 1, characterized in that: the diffusion device (10) is provided with an expansion cavity (11), and the expansion cavity (11) and the periphery of a tray (12) arranged at the bottom are provided with strip slits (13).
4. The semi-dry flue gas desulfurization and dust removal device according to claim 1, characterized in that: a flue gas regulating valve (17) is arranged on a connecting pipe of the flue gas inlet (6) of each reactor (3) and the air inlet main pipe (14).
5. The semi-dry flue gas desulfurization and dust removal device according to claim 1, characterized in that: the desulfurizer inlet (5) is connected with the horizontal distributing device (18), and the desulfurizer is uniformly distributed into each reactor (3) through the horizontal distributing device (18).
6. The semi-dry flue gas desulfurization and dust removal device according to claim 1, characterized in that: the water supply of each reactor (3) is supplied by a unified valve frame water supply system (19), and a variable-frequency speed-regulating water pump and a flow regulating mechanism are arranged in the valve frame water supply system (19); meanwhile, a hydraulic balance valve (20) is arranged on each water supply branch pipe of the reactor (3).
7. The semi-dry flue gas desulfurization and dust removal device according to claim 1, characterized in that: a circulating material control device (21) is arranged at the lower part of each dust remover unit (1), so that the desulfurizer separated by the dust remover unit (1) can be circularly put into the reactor (3) and a desulfurization byproduct is discharged; a byproduct conveying chute (22) is arranged at the downstream of the circulating material control device (21) and communicated with the storage bin.
8. The semi-dry flue gas desulfurization and dust removal device according to claim 4, characterized in that: a filter (15) and a pressurizing fan (16) are arranged on a connecting pipe of the air inlet main pipe (14) and the flue gas inlet (6) of each reactor (3).
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| CN201921201899.8U CN210993738U (en) | 2019-07-29 | 2019-07-29 | Semidry flue gas desulfurization dust collector |
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| CN201921201899.8U CN210993738U (en) | 2019-07-29 | 2019-07-29 | Semidry flue gas desulfurization dust collector |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110327768A (en) * | 2019-07-29 | 2019-10-15 | 贵阳铝镁设计研究院有限公司 | Semi-dry process flue gas desulphurization dust collecting process and its device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110327768A (en) * | 2019-07-29 | 2019-10-15 | 贵阳铝镁设计研究院有限公司 | Semi-dry process flue gas desulphurization dust collecting process and its device |
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