CN114608339A - High-efficiency dust removal and power generation system for metallurgical flue gas and working method thereof - Google Patents
High-efficiency dust removal and power generation system for metallurgical flue gas and working method thereof Download PDFInfo
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- CN114608339A CN114608339A CN202210284299.2A CN202210284299A CN114608339A CN 114608339 A CN114608339 A CN 114608339A CN 202210284299 A CN202210284299 A CN 202210284299A CN 114608339 A CN114608339 A CN 114608339A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
- B03C3/017—Combinations of electrostatic separation with other processes, not otherwise provided for
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/008—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases cleaning gases
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D2017/009—Cyclone for separating fines from gas
Abstract
The invention discloses a high-efficiency dust removal and power generation system for metallurgical flue gas and a working method thereof, and belongs to the technical field of metallurgical flue gas treatment. Comprises a cyclone filter, an electric polymerization filter, a bag type electrostatic filter, a toxic gas purification system and a waste heat utilization system which are connected in sequence; the electric focusing filter comprises an electric focusing filter cylinder body, the lower part of the electric focusing filter cylinder body is connected with an electric focusing filter dust collecting box, an ultrasonic horn, a stirring device and a plurality of groups of electric focusing dust collectors are arranged in the electric focusing filter cylinder body, the ultrasonic horn is arranged above the plurality of groups of electric focusing dust collectors, and the stirring device is arranged below the plurality of groups of electric focusing dust collectors; the bag-type electrostatic filter comprises a bag-type electrostatic filter cylinder, the lower part of the bag-type electrostatic filter cylinder is connected with a bag-type electrostatic filter dust collection box, and a plurality of groups of bag-type electrostatic precipitators are arranged in the bag-type electrostatic filter cylinder. The invention can remove solid particles of metallurgical flue gas at high temperature, increase heat transfer effect in the waste heat boiler and deeply utilize the waste heat of the flue gas.
Description
Technical Field
The invention belongs to the technical field of metallurgical flue gas treatment, and particularly relates to a metallurgical flue gas efficient dust removal and power generation system and a working method thereof.
Background
The industrial dust and smoke dust are main pollution sources influencing atmospheric environment and causing haze, and the effective control of particulate matter emission is the focus of industrial departments and social attention. Meanwhile, flue gas carrying industrial dust often contains a large amount of heat energy, and comprehensive utilization of the heat energy is the hot spot field of angular force in the industry.
In the metal smelting process, the temperature of the generated flue gas is high. Generally, the flue gas temperature of the smelting reverberatory furnace and the fuming furnace is about 1200-1250 ℃, the flue gas temperature of the refining reverberatory furnace is 1250-1300 ℃, and the flue gas temperature of the flash furnace and the vortex furnace is up to 1300-1350 ℃. The temperature grade of the flue gas belongs to a high-temperature heat source in the field of waste heat utilization, is very suitable for being converted into electric energy, and also has high thermoelectric conversion efficiency.
However, metallurgical fumes often contain a large amount of dust, e.g. about 80-150g/m3About 150-350g/m of fluidized bed roaster3And the device is easy to block and deposit on the heat transfer surface, thereby reducing the heat transfer effect. Therefore, the dust-containing problem of metallurgical high-temperature flue gas hinders the application of the metallurgical high-temperature flue gas in the aspect of waste heat utilization.
Under current technical condition, some miniature metallurgical enterprises, the flue gas dust volume is big, and the waste heat utilization technique degree of difficulty is too big, often adopts the mode of natural cooling, sack dust removal. For large-scale metallurgical enterprises, the existing waste heat utilization system has the defects of serious ash deposition on the inner pipe wall of the boiler, low heat transfer efficiency, easy blockage of a flue gas passage, high exhaust gas temperature and insufficient and incomplete waste heat utilization due to the problem of acid dew point of the boiler.
Disclosure of Invention
In order to solve the above problems, an object of the present invention is to provide a high-efficiency dust removal and power generation system for metallurgical flue gas and a working method thereof, which can remove solid particles of metallurgical flue gas at a high temperature, increase the heat transfer effect in a waste heat boiler, and deeply utilize the waste heat of the flue gas.
The invention is realized by the following technical scheme:
the invention discloses a high-efficiency dust removal and power generation system for metallurgical flue gas, which comprises a cyclone filter, an electrocoagulation filter, a bag type electrostatic filter, a poisonous gas purification system and a waste heat utilization system which are sequentially connected;
the electric focusing filter comprises an electric focusing filter cylinder body, the lower part of the electric focusing filter cylinder body is connected with an electric focusing filter dust collecting box, an ultrasonic horn, a stirring device and a plurality of groups of electric focusing dust collectors are arranged in the electric focusing filter cylinder body, the ultrasonic horn is arranged above the plurality of groups of electric focusing dust collectors, and the stirring device is arranged below the plurality of groups of electric focusing dust collectors;
the bag-type electrostatic filter comprises a bag-type electrostatic filter cylinder, the lower part of the bag-type electrostatic filter cylinder is connected with a bag-type electrostatic filter dust collection box, and a plurality of groups of bag-type electrostatic precipitators are arranged in the bag-type electrostatic filter cylinder.
Preferably, the cyclone filter comprises a cyclone filter cylinder body, the lower part of the cyclone filter cylinder body is connected with a cyclone filter dust collection box, the center of the cyclone filter is connected with a high-temperature-resistant filter bag, a flue gas outlet is provided with a cyclone filter air back-blowing device, and the flue gas outlet is connected with an inlet of the electric polymerization filter.
Preferably, the cylinder wall of the cyclone filter cylinder body is of a multilayer composite structure, a support body made of temperature-resistant alloy steel is arranged in the middle of the cylinder wall, the inner side of the support body is provided with an assembled ceramic tile block, and the outer side of the support body is provided with a heat-insulating material; the high temperature resistant filter bag is made by carbon fiber weaving, needle punching or spunlace process.
Preferably, the electric aggregation filter is of an upper inlet and lower outlet structure, an inlet is connected with a smoke outlet of the cyclone filter, and an outlet is connected with an inlet of the bag type electrostatic filter; each group of the electric aggregation dust collector comprises an electric aggregation filter electrode needle and an electric aggregation filter electrode plate, the electric aggregation filter electrode plate is in a cylindrical shape gradually expanding from top to bottom, and the electric aggregation filter electrode needle is arranged in the electric aggregation filter electrode plate.
Further preferably, the electropolymerization filter electrode pins in each group of electropolymerization dust collectors are opposite in polarity to the electropolymerization filter electrode plates, the adjacent electropolymerization filter electrode pins are opposite in polarity, and the adjacent electropolymerization filter electrode plates are opposite in polarity.
Further preferably, the stirring device is a self-operated stirrer; the electrode plate of the electric polymerization filter is made by stacking carbon fiber cloth.
Preferably, the bag-type electrostatic filter has a structure of downward inlet and upward outlet, an inlet is connected with an outlet of the electrocoagulation filter, and an outlet is connected with a toxic gas purification system; each group of electrostatic precipitator comprises a bag type electrostatic filter electrode needle and an electrostatic filter bag, wherein the opening of the electrostatic filter bag faces downwards, the bag type electrostatic filter electrode needle is arranged in the electrostatic filter bag, the polarity of the bag type electrostatic filter electrode needle is opposite to that of the electrostatic filter bag, and the upper part of the electrostatic filter bag is provided with a bag type electrostatic filter air back-blowing device.
Further preferably, the electrostatic filter bag is made of sintered metal particles or woven carbon fibers.
Preferably, the separation precision of the cyclone filter is more than 20 μm, the separation precision of the electrocoagulation filter is more than 10 μm, and the separation precision of the bag type electrostatic filter is more than 2.5 μm.
The invention discloses a working method of the metallurgical flue gas high-efficiency dust removal and power generation system, which comprises the following steps:
the high-temperature flue gas enters a cyclone filter, the larger and heavier solid particles are collected, the smaller solid particles are captured inside, and the rest flue gas carrying dust leaves the cyclone filter and enters an electric aggregation filter; the electric aggregation dust collector enables smaller solid particles in the smoke to be captured and collected, the residual solid particles and gas which are not captured are driven by the rotation of the stirring device to mix dust carrying gas of the adjacent electric aggregation dust collector, the solid particles are aggregated into a group to form large particles, the large particles fall into the dust collection box of the electric aggregation filter, and then the smoke leaves the electric aggregation filter and enters the bag type electrostatic filter; the ultrasonic horn generates ultrasonic oscillation to enable solid particles which are deposited on the electric aggregation dust collector and cannot fall down to fall into the dust collection box of the electric aggregation filter; the flue gas filtered by the electric polymerization filter enters a bag type electrostatic filter, under the discharge action of an electrostatic precipitator, dust carrying gas and solid particles are charged and adsorbed and deposited, clean gas flows out, and the solid particles fall into a bag type electrostatic filter dust collection box;
the dust-free gas filtered by the cyclone filter, the electrostatic precipitator and the bag-type electrostatic filter sequentially enters a toxic gas purification system for detoxification and harm removal, and then enters a waste heat recovery system for efficiently converting the rest heat into electric energy, and part of the electric energy is used for meeting the power consumption requirements of the electrostatic precipitator and the bag-type electrostatic precipitator and a flue gas circulating fan in the system.
Compared with the prior art, the invention has the following beneficial technical effects:
at present, the process flow of waste heat utilization of large-scale metallurgical enterprises generally includes that heat energy of the large-scale metallurgical enterprises is transferred to other media such as water vapor or other working media with low boiling points through a waste heat boiler, the heat energy of the large-scale metallurgical enterprises is converted into electric energy, and then dust removal and purification of flue gas are carried out. The process flow has the advantages that dust is removed at a lower temperature, and dust removal equipment is simplified; however, the method has the problems of serious dust deposition on the inner tube wall of the boiler, low heat transfer efficiency, easy blockage of a flue gas passage, high exhaust gas temperature and insufficient and incomplete waste heat utilization due to the problem of acid dew points of the boiler.
According to the high-efficiency dust removal and power generation system for the metallurgical flue gas, disclosed by the invention, the dust of the high-temperature flue gas is removed through the cyclone filter, the electric aggregation filter and the bag type electrostatic filter, and the dust is fully utilized in a subsequent waste heat power generation system by matching with a toxic gas purification system, so that the waste heat utilization rate is greatly improved. The metallurgical flue gas is filtered and arranged in front of the waste heat power generation utilization system, so that the dust-containing flue gas is prevented from depositing on the wall surface of a heat transfer pipe in the waste heat boiler to influence the heat exchange effect of the boiler, and meanwhile, deposited dust is prevented from blocking a flue gas channel, and boiler safety accidents are avoided; the continuous three-stage dust powerful filter can reduce the diameter of solid particles to below 2.5 mu m, and reaches the relevant national environmental protection standard; the toxic gas purification system is arranged in front of the waste heat power generation system, so that the exhaust smoke of the waste heat boiler is not limited by acid dew point temperature, the exhaust smoke temperature is fully reduced, and waste heat is deeply utilized; and part of electric energy generated by waste heat utilization meets the power consumption requirements of a cyclone filter, an electric aggregation filter, a bag type electrostatic filter and a flue gas circulating fan.
Compared with the traditional cyclone filter, the high-temperature-resistant filter bag and the air back-blowing device of the cyclone filter are arranged in the cyclone filter, the high-temperature-resistant filter bag can filter part of dust which does not impact the wall surface of the cylinder body of the cyclone filter through inertia, and the air back-blowing device can be started in due time to blow the high-temperature-resistant filter bag, so that the filtering effect is ensured, and the resistance is prevented from being increased after blockage.
Furthermore, the detachable ceramic tile blocks are arranged on the inner side of the cylinder body of the cyclone filter, so that high-temperature erosion of the cylinder body supporting body by smoke is prevented. And meanwhile, the heat insulation material is arranged on the outer side of the support body, so that heat is prevented from leaking.
Furthermore, the electric aggregation filter of the invention adds a dust aggregation function with different charges on the basis of the working principle of the traditional electrostatic filter, can aggregate fine dust into dust groups with larger sizes to a greater extent, and then falls into the dust collection box under the action of gravity. Meanwhile, dust deposited on the cylinder of the electric focusing filter under the action of static electricity is difficult to fall into the dust collecting box under the action of gravity, so that the ultrasonic horn is arranged at the head of the electric focusing filter, and the dust can be promoted to fall into the dust collecting box under the vibration of sound waves.
Furthermore, a self-operated stirrer is arranged at the lower part of the electric aggregation filter, so that the dust with different charges flowing out of the adjacent electric aggregation dust collectors is mixed and aggregated into a dust block.
Furthermore, the cylinder body of the electric aggregation filter is in an expanded cylindrical shape, so that dust can fall off conveniently.
Further, the bag-type electrostatic filter is based on the working principle of the traditional bag-type filter, the novel filter bag is positively charged, the electrodes are arranged in the filter bag to generate negative charges, and after dust-containing gas enters the filter bag, the electrodes discharge to enable dust to be negatively charged and diffuse and deposit on the surface or in pores of the filter bag with the positive charges. The air pulse back-blowing device is started in time to blow dust on the filter bag in the bag type electrostatic filter so as to ensure the filtering effect and avoid the resistance rise after blockage.
The working method of the metallurgical flue gas efficient dust removal and power generation system disclosed by the invention has high automation degree, can remove solid particles of metallurgical flue gas at a high temperature, increases the heat transfer effect in the waste heat boiler and deeply utilizes the waste heat of the flue gas.
Drawings
FIG. 1 is a schematic diagram of the overall structure of the system of the present invention;
FIG. 2 is a schematic view of a cyclone filter;
FIG. 3 is an enlarged partial schematic view of FIG. 2;
FIG. 4 is a schematic structural view of an electropolymerization filter;
fig. 5 is a schematic structural view of a bag-type electrostatic filter.
In the figure: 1-a cyclone filter, 2-an electrocoagulation filter, 3-a bag type electrostatic filter, 4-a toxic gas purification system, 5-a waste heat utilization system, 6-a cyclone filter cylinder, 7-a cyclone filter dust box, 8-a high temperature resistant filter bag, 9-a cyclone filter air back-blowing device, 10-a support body, 11-an assembled ceramic tile block, 12-a thermal insulation material, 13-an electrocoagulation filter cylinder, 14-an electrocoagulation filter dust box, 15-an ultrasonic horn, 16-an electrocoagulation dust collector, 17-a stirring device, 18-an ultrasonic signal generator, 19-an electrocoagulation electrode filter needle, 20-an electrocoagulation filter electrode plate, 21-an electrocoagulation filter power supply, 22-a bag type electrostatic filter cylinder and 23-a bag type electrostatic filter dust box, 24-bag electrostatic filter air blowback device, 25-electrostatic precipitator, 26-bag electrostatic filter electrode needle, 27-electrostatic filter bag, 28-bag electrostatic filter power supply.
Detailed Description
The invention will now be described in further detail with reference to the following figures and examples, which are intended to illustrate and not to limit the invention:
referring to fig. 1, the process flow diagram of the metallurgical flue gas high-efficiency dust removal and power generation system of the invention comprises a cyclone filter 1, an electrocoagulation filter 2, a bag type electrostatic filter 3, a toxic gas purification system 4 and a waste heat utilization system 5. After passing through the cyclone filter 1, the high-temperature flue gas sequentially enters the electrocoagulation filter 2 and the bag type electrostatic filter 3, then enters the toxic gas purification system 4, finally enters the waste heat power generation system 5, and is discharged into the atmospheric environment.
Fig. 2 is a schematic diagram of the cyclone filter 1 of the present invention, which comprises a cyclone filter cylinder 6, a cyclone filter dust box 7, a high temperature resistant filter bag 8 and a cyclone filter air back-blowing device 9, wherein the filter material of the high temperature resistant filter bag 8 is made by carbon fiber weaving, needle punching or spunlace process. As shown in fig. 3, the support body 10 of the cyclone filter cylinder 6 is made of temperature-resistant alloy steel, the assembled ceramic tile 11 is arranged on the inner side of the support body 10, and the heat-insulating material 12 is arranged on the outer side of the support body 10.
Fig. 4 is a schematic view of an electrofusion filter 2 according to the present invention, comprising an electrofusion filter cylinder 13, an electrofusion filter dust box 14, an ultrasonic horn 15, an electrofusion dust collector 16 and a stirring device 17, wherein the ultrasonic horn 15 is arranged with an ultrasonic signal generator 18, and the electrofusion dust collector 16 comprises an electrofusion filter electrode pin 19, an electrofusion filter electrode plate 20 and an electrofusion filter power supply 21. The stirring device 17 is a self-operated stirrer. Wherein the polarity of the electrode needle 19 of the electric polymerization filter is opposite to that of the corresponding electrode plate 20 of the electric polymerization filter, the polarity of the electrode needle 19 of the adjacent electric polymerization filter is opposite to that of the electrode plate 20 of the electric polymerization filter, and the electrode plate 20 of the electric polymerization filter is in an expanding cylinder shape and is made by stacking carbon fiber cloth.
Fig. 5 is a schematic view of the bag-type electrostatic filter 3 of the present invention, which includes a bag-type electrostatic filter cylinder 22, a bag-type electrostatic filter dust box 23, a bag-type electrostatic filter air blowback device 24, and an electrostatic precipitator 25. The electrostatic precipitator 25 comprises a bag type electrostatic filter electrode needle 26, an electrostatic filter bag 27 and a bag type electrostatic filter power supply 28, wherein the electrostatic filter bag 27 is made of metal particle sintering or carbon fiber weaving.
The working method of the metallurgical flue gas efficient dust removal and power generation system comprises the following steps:
the metallurgical high-temperature flue gas passes through a cyclone filter 1 to filter solid particles with the size of more than 20 microns, passes through an electrocoagulation filter 2 to filter solid particles with the size of more than 10 microns, passes through a bag-type electrostatic filter 3 to filter solid particles with the size of more than 2.5 microns, enters a toxic gas purification system 4, finally converts the waste heat of the high-temperature flue gas into electric energy in a waste heat power generation system 5, and the boiler exhaust gas enters the atmospheric environment.
High temperature flue gas gets into cyclone 1, and is rotatory around its axis circumference, and the great heavier solid particle impact cyclone 6 of size falls into cyclone dust collection box 7, and remaining dust-carrying gas filters through high temperature resistant filter bag 8, leaves cyclone 1, gets into electric polymerization filter 2, and cyclone 9 pulse blowback of air blowback device is high temperature resistant filter bag 8, avoids its jam.
The flue gas filtered by the cyclone filter 1 enters the electric polymerization filter 2, the electric polymerization filter electrode needle 19 discharges to enable the dust-carrying flue gas to carry positive charges or negative charges, the dust-carrying flue gas is captured by the electric polymerization filter electrode plate 20 with opposite charges in the downstream flowing process and deposited on the surface of the electric polymerization filter electrode plate, then the electric polymerization filter electrode needle sinks into the electric polymerization filter dust collection box 14 under the action of gravity, the dust-carrying gas which is not captured by the electric polymerization filter electrode plate 20 is driven by the rotation of the stirring device 17 at the outlet area of the electric polymerization filter electrode plate, the dust-carrying gas with different charges at the outlet of the adjacent electric polymerization filter electrode plate 20 is mixed, solid particles are aggregated into a cluster to form large particles, the large particles fall into the electric polymerization filter dust collection box 14, and then the flue gas leaves the electric polymerization filter 2 and enters the electrostatic filter 3. In addition, the ultrasonic signal generator 18 generates ultrasonic waves, and the ultrasonic waves are oscillated by the ultrasonic horn 15, so that the solid particles which are deposited on the electrode plate 20 of the electric focusing filter but cannot fall off fall into the dust collection box 14 of the electric focusing filter.
The flue gas filtered by the electric polymerization filter 2 enters the bag type electrostatic filter 3, under the discharging action of the electrode needle 26 of the bag type electrostatic filter, the dust-carrying gas is charged with negative charges, rises along the interior of the electrostatic filter bag 27 cylinder, and is deposited under the adsorption action of the electrostatic filter bag 27 with positive charges, and the clean gas flows out from the outlet of the bag type electrostatic filter 3 through the pores of the electrostatic filter bag 27 cylinder. In addition, the solid particles deposited on the inner side of the cylinder of the electrostatic filter bag 27 fall into the bag-type electrostatic filter dust collecting box 23 under the back blowing action of the bag-type electrostatic filter air back blowing device 24.
The dust-free gas filtered by the cyclone filter 1, the electrostatic precipitator 2 and the bag-type electrostatic precipitator 3 in sequence enters a toxic gas purification system 4 for detoxification, and then enters a waste heat recovery system 5 for efficiently converting the rest heat into electric energy, and part of the electric energy is used for meeting the power consumption requirements of the electrostatic precipitator 2, the bag-type electrostatic precipitator 3 and the flue gas circulating fan.
The above description is only a part of the embodiments of the present invention, and some terms are used in the present invention, but the possibility of using other terms is not excluded. These terms are used merely for convenience in describing and explaining the nature of the invention and are to be construed as any additional limitation which is not in accordance with the spirit of the invention. The foregoing is merely an illustration of the present invention for the purpose of providing an easy understanding and is not intended to limit the present invention to the particular embodiments disclosed herein, and any technical extensions or innovations made herein are protected by the present invention.
Claims (10)
1. A high-efficiency dust removal and power generation system for metallurgical flue gas is characterized by comprising a cyclone filter (1), an electric aggregation filter (2), a bag type electrostatic filter (3), a toxic gas purification system (4) and a waste heat utilization system (5) which are sequentially connected;
the electric focusing filter (2) comprises an electric focusing filter cylinder body (13), the lower part of the electric focusing filter cylinder body (13) is connected with an electric focusing filter dust collection box (14), an ultrasonic horn (15), a stirring device (17) and a plurality of groups of electric focusing dust collectors (16) are arranged in the electric focusing filter cylinder body (13), the ultrasonic horn (15) is arranged above the plurality of groups of electric focusing dust collectors (16), and the stirring device (17) is arranged below the plurality of groups of electric focusing dust collectors (16);
the bag type electrostatic filter (3) comprises a bag type electrostatic filter cylinder (22), the lower part of the bag type electrostatic filter cylinder (22) is connected with a bag type electrostatic filter dust collection box (23), and a plurality of groups of bag type electrostatic dust collectors (25) are arranged in the bag type electrostatic filter cylinder (22).
2. The metallurgical flue gas high-efficiency dust removal and power generation system according to claim 1, wherein the cyclone filter (1) comprises a cyclone filter cylinder (6), a cyclone filter dust collection box (7) is connected to the lower part of the cyclone filter cylinder (6), a high-temperature resistant filter bag (8) is connected to the center of the cyclone filter (1), a flue gas outlet is provided with a cyclone filter air back-blowing device (9), and the flue gas outlet is connected with an inlet of the electric aggregation filter (2).
3. The metallurgical flue gas high-efficiency dust removal and power generation system according to claim 2, wherein the cylinder wall of the cyclone filter cylinder (6) is of a multilayer composite structure, a support body (10) made of temperature-resistant alloy steel is arranged in the middle of the cylinder wall, the inner side of the support body (10) is provided with an assembled ceramic tile block (11), and the outer side of the support body (10) is provided with a heat-insulating material (12); the high-temperature resistant filter bag (8) is made by carbon fiber weaving, needling or spunlace process.
4. The metallurgical flue gas high-efficiency dedusting and power generation system according to claim 1, wherein the electrocoagulation filter (2) is of an upper-inlet-lower-outlet structure, an inlet is connected with a flue gas outlet of the cyclone filter (1), and an outlet is connected with an inlet of the bag-type electrostatic filter (3); each group of the electric aggregation dust collector (16) comprises an electric aggregation filter electrode needle (19) and an electric aggregation filter electrode plate (20), the electric aggregation filter electrode plate (20) is in a cylindrical shape gradually expanding from top to bottom, and the electric aggregation filter electrode needle (19) is arranged in the electric aggregation filter electrode plate (20).
5. The metallurgical fume dust-removing and power generating system according to claim 4, characterized in that the electric focusing filter electrode needle (19) in each group of electric focusing dust collector (16) is opposite to the electric focusing filter electrode plate (20) in polarity, the adjacent electric focusing filter electrode needle (19) is opposite in polarity, and the adjacent electric focusing filter electrode plate (20) is opposite in polarity.
6. The high-efficiency dust removal and power generation system for metallurgical flue gas as recited in claim 4, wherein the stirring device (17) is a self-operated stirrer; the electrode plate (20) of the electric polymerization filter is made by superposing carbon fiber cloth.
7. The metallurgical flue gas high-efficiency dedusting and power generation system according to claim 1, wherein the bag-type electrostatic filter (3) has a structure of a lower inlet and an upper outlet, an inlet is connected with an outlet of the electrocoagulation filter (2), and an outlet is connected with the poisonous gas purification system (4); each group of electrostatic dust collector (25) comprises a bag type electrostatic filter electrode needle (26) and an electrostatic filter bag (27), the opening of the electrostatic filter bag (27) is downward, the bag type electrostatic filter electrode needle (26) is arranged in the electrostatic filter bag (27), the polarity of the bag type electrostatic filter electrode needle (26) is opposite to that of the electrostatic filter bag (27), and the upper part of the electrostatic filter bag (27) is provided with a bag type electrostatic filter air back blowing device (24).
8. The metallurgical fume dust-removing and power generating system with high efficiency according to claim 7, wherein the electrostatic filter bag (27) is made of sintered metal particles or woven carbon fiber.
9. The metallurgical flue gas high-efficiency dedusting and power generation system according to claim 1, characterized in that the separation precision of the cyclone filter (1) is more than 20 μm, the separation precision of the electrocoagulation filter (2) is more than 10 μm, and the separation precision of the bag type electrostatic filter (3) is more than 2.5 μm.
10. The working method of the metallurgical flue gas high-efficiency dust removal and power generation system according to any one of claims 1 to 9, characterized by comprising the following steps:
high-temperature flue gas enters the cyclone filter (1), larger and heavier solid particles are collected, relatively smaller solid particles are captured inside, and the rest flue gas carrying dust leaves the cyclone filter (1) and enters the electric polymerization filter (2); the electric aggregation dust collector (16) enables smaller solid particles in the smoke to be captured and collected, the residual solid particles and gas which are not captured are driven by the rotation of the stirring device (17) to mix dust carrying gas of the adjacent electric aggregation dust collector (16), the solid particles are aggregated to form large particles and fall into the dust collection box (14) of the electric aggregation filter, and then the smoke leaves the electric aggregation filter (2) and enters the bag type electrostatic filter (3); the ultrasonic horn (15) generates ultrasonic vibration to enable solid particles which are deposited on the electric aggregation dust collector (16) and cannot fall down to fall into the electric aggregation filter dust collection box (14); the flue gas filtered by the electric polymerization filter (2) enters a bag type electrostatic filter (3), under the discharge action of an electrostatic precipitator (25), dust carrying gas and solid particles are charged and adsorbed and deposited, the clean gas flows out, and the solid particles fall into a bag type electrostatic filter dust collection box (23);
the dust-free gas filtered by the cyclone filter (1), the electrostatic precipitator (2) and the bag-type electrostatic precipitator (3) in sequence enters a toxic gas purification system (4) to carry out detoxification and harm-removal work, then enters a waste heat recovery system (5) to efficiently convert the rest heat into electric energy, and part of the electric energy is used for meeting the power consumption requirements of the electrostatic precipitator (2), the bag-type electrostatic precipitator (3) and a smoke circulating fan in the system.
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| CN110986605A (en) * | 2019-11-30 | 2020-04-10 | 南京常荣声学股份有限公司 | Comprehensive treatment system and method for flue gas of rotary hearth furnace |
| CN210544073U (en) * | 2019-05-10 | 2020-05-19 | 华电电力科学研究院有限公司 | Device of many fields desorption fine particles thing in coordination |
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2022
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| CN2381394Y (en) * | 1999-07-27 | 2000-06-07 | 无锡东雄重型电炉有限公司 | Electric filter-bag dust collector |
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| CN203355545U (en) * | 2013-07-08 | 2013-12-25 | 安徽省元琛环保科技有限公司 | Cyclone bag-type composite dust collector |
| CN106123613A (en) * | 2016-06-30 | 2016-11-16 | 凯天环保科技股份有限公司 | A kind of glass furnace cigarette advanced purification process |
| CN210544073U (en) * | 2019-05-10 | 2020-05-19 | 华电电力科学研究院有限公司 | Device of many fields desorption fine particles thing in coordination |
| CN110986605A (en) * | 2019-11-30 | 2020-04-10 | 南京常荣声学股份有限公司 | Comprehensive treatment system and method for flue gas of rotary hearth furnace |
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