CN212440597U - Flue gas quenching dust collector that restraines dioxin regeneration - Google Patents
Flue gas quenching dust collector that restraines dioxin regeneration Download PDFInfo
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- CN212440597U CN212440597U CN202021083416.1U CN202021083416U CN212440597U CN 212440597 U CN212440597 U CN 212440597U CN 202021083416 U CN202021083416 U CN 202021083416U CN 212440597 U CN212440597 U CN 212440597U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/30—Technologies for a more efficient combustion or heat usage
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Abstract
The utility model belongs to the field of dioxin suppression and flue gas dust removal of electric arc furnace flue gas, and relates to a flue gas quenching dust removal device for suppressing the regeneration of dioxin, which comprises a water-cooling cyclone separator, a mixed air cooler, a bag-type dust remover and a chimney which are arranged in sequence; one end of the outlet of the bag-type dust collector is connected with the chimney, and the other end of the outlet of the bag-type dust collector is connected with the air-mixing cooler through the circulating flue; and the air mixing cooler is internally provided with an air mixing fan. The utility model has the advantages of high heat exchange efficiency, and effective inhibition of the re-synthesis of dioxin; but also can not cause the problems of sewage treatment, pipeline blockage, bag pasting of a dust removal cloth bag and the like; the flue gas is mixed for cooling instead of air, so that the problems caused by secondary combustion of the flue gas can be effectively avoided; the dust removal equipment in the system can realize dust removal and purification of the flue gas in the circulation process, and the flue gas reaches the emission standard.
Description
Technical Field
The utility model belongs to electric arc furnace flue gas dioxin restraines and flue gas dust removal field, relates to a flue gas rapid cooling dust collector who restraines dioxin regeneration.
Background
The electric arc furnace steelmaking has the characteristics of short flow, energy conservation and the like, and the short-flow electric arc furnace steelmaking gradually replaces part of the long-flow converter steelmaking along with the continuous increase of the scrap steel amount in China and the adjustment of the national industrial structure. However, in the process of steelmaking in an electric arc furnace, chlorine-containing organic matters such as plastics and paint are adhered to the waste steel raw materials, and the chlorine-containing organic matters are decomposed and combusted into dioxin-like substances at high temperature, and the dioxin-like substances have acute lethal toxicity, high carcinogenicity, teratogenicity and the like, and can generate large-range and long-term harm to any animals. On the other hand, the flue gas generated by electric arc furnace steel making contains a large amount of dust, and the flue gas can be discharged after being subjected to dust removal treatment.
According to theoretical calculation and experimental data, when the flue gas temperature of the electric arc furnace is higher (such as 1000 ℃), dioxin substances can be decomposed, but when the flue gas temperature is reduced to a window range (such as 250 ℃ -450 ℃), the dioxin substances in the flue gas can be synthesized again, and the dioxin substances enter the atmosphere along with the emission of the flue gas, so that the environmental pollution is caused. The device and the system in the patent can let the flue gas reach rapid cooling when resynthesizing temperature window through the mode of circulation mixed wind, reduce the dwell time of flue gas at the resynthesizing temperature scope to reach the purpose that suppresses the regeneration of dioxin class material in the flue gas, and realize the purification of flue gas through dust collector among the flue gas circulation system. The traditional water-cooled wall heat exchange cooling method has low heat transfer efficiency, longer time of high-temperature flue gas staying in a resynthesis temperature window and poorer synthesis inhibition on dioxin substances. The traditional direct water spraying cooling method can generate more sewage, the sewage treatment is very troublesome, the moisture content of the flue gas can be increased rapidly due to direct water spraying, and the problems of pipeline blockage or bag pasting of a dust removal cloth bag can be easily caused after dust and water in the flue gas are mixed; the flue gas mixes the wind with the air and can reach the effect of cooling, but the oxygen in the air can produce postcombustion or explosion with remaining carbon dust or carbon monoxide in the flue gas, not only influences and mixes the cooling effect, more can bring the potential safety hazard.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model aims at providing a flue gas rapid cooling dust collector who restraines dioxin regeneration utilizes the flue gas to mix the cooling rather than utilizing the air mixing cooling, effectively avoids the problem that flue gas postcombustion brought.
In order to achieve the above purpose, the utility model provides a following technical scheme:
a flue gas quenching dust removal device for inhibiting the regeneration of dioxin comprises a water-cooling cyclone separator, an air-mixing cooler, a bag-type dust remover and a chimney which are sequentially arranged; one end of the outlet of the bag-type dust collector is connected with the chimney, and the other end of the outlet of the bag-type dust collector is connected with the air-mixing cooler through the circulating flue; and the air mixing cooler is internally provided with an air mixing fan.
Optionally, the water-cooled cyclone separator comprises an inner cylinder and an outer cylinder which are composed of water-cooled tubes; the inner cylinder is communicated with the outer cylinder, and the inner cylinder is connected with the air mixing cooler.
Optionally, the water-cooled cyclone separator further comprises an inlet connected to the outer cylinder, and the inlet is also composed of a water-cooled tube.
Optionally, a first temperature and flow monitoring unit is arranged between the water-cooling cyclone separator and the air mixing cooler, a second temperature and flow monitoring unit is arranged between the air mixing cooler and the bag-type dust remover, and a third temperature and flow monitoring unit is arranged on the circulating flue.
Optionally, at least one group of water-cooling heat exchangers is further arranged on the circulating flue.
Optionally, a smoke exhaust fan is further arranged between the bag-type dust collector and the chimney.
Optionally, a smoke exhaust adjusting valve is further arranged between the smoke exhaust fan and the bag-type dust collector.
Optionally, an atmospheric access valve is further disposed on the circulating flue.
The beneficial effects of the utility model reside in that:
the utility model can ensure the heat exchange efficiency, effectively inhibit the resynthesis of dioxin by controlling the temperature, and can not cause the problems of sewage treatment, pipeline blockage, bag pasting of a dust removal cloth bag and the like; the utility model utilizes the mixed cooling of the flue gas rather than the mixed cooling of the air, thereby effectively inhibiting the problems caused by the secondary combustion of the flue gas; the dust removal equipment in the system can realize dust removal and purification of the flue gas in the circulation process, and the flue gas reaches the emission standard.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and/or combinations particularly pointed out in the appended claims.
Drawings
For the purposes of promoting a better understanding of the objects, features and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:
fig. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic structural view of a water-cooled cyclone separator.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The present invention can also be implemented or applied through other different specific embodiments, and various details in the present specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and the features in the following embodiments and examples may be combined with each other without conflict.
Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in any way limiting the scope of the invention; for a better understanding of the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", "front", "back", etc., indicating directions or positional relationships based on the directions or positional relationships shown in the drawings, it is only for convenience of description and simplification of description, but it is not intended to indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore, the terms describing the positional relationships in the drawings are only used for illustrative purposes and are not to be construed as limiting the present invention, and those skilled in the art can understand the specific meanings of the terms according to specific situations.
Referring to fig. 1-2, the reference numbers in the figures refer to the following elements: the device comprises an electric arc furnace 1, an inlet 2, an outer barrel 3, an inner barrel 4, a first temperature flow monitoring unit 5, a second temperature flow monitoring unit 6, a third temperature flow monitoring unit 7, a mixed air cooler 8, a mixed air fan 9, an atmospheric connection valve 10, a bag-type dust collector 11, a bag-type dust collection and discharge port 12, a water-cooled heat exchanger 13, a smoke exhaust regulating valve 14, a smoke exhaust fan 15, a fourth flow control unit 16 and a chimney 17.
The utility model discloses a flue gas rapid cooling dust collector who restraines dioxin regeneration, the high temperature flue gas that 1 department of electric arc furnace produced at first gets into urceolus 3 through water-cooling cyclone's entry 2 and carries out thick dust removal and cooling, then flows through inner tube 4. The flue gas then enters the air mixing cooler 8 to be mixed with the low-temperature circulating flue gas, and the air mixing fan 9 provides flue gas circulating power and simultaneously enables the high-temperature flue gas and the circulating flue gas to be mixed more quickly and fully. The mixed flue gas is subjected to fine dust removal through a bag-type dust remover 11, and the emission standard is met. One part of the flue gas after fine dust removal is directly discharged through a chimney 17, and the other part of the flue gas enters a circulating flue. And a water-cooling heat exchanger 13 is arranged in the circulating flue to further cool the circulating flue gas, so that the air-mixing cooling effect is better. Temperature and flue gas flow balance in the circulation system are ensured through temperature flow monitoring point and flow control valve in the system, make this utility model effectively restrain the regeneration of dioxin in, also can reach the effect that the flue gas removed dust. Fig. 2 is a partial schematic view of a water-cooled cyclone separator, which comprises an inlet 2, an outer cylinder 3 and an inner cylinder 4, all parts of which are composed of water-cooled tubes, and circulating water passes through the inside of the water-cooled cyclone separator to achieve the effect of cooling flue gas.
The utility model discloses can adopt following control means to ensure the cooling effect. The flow of circulating water in the water-cooling cyclone separator can be adjusted in real time according to the temperature measured at the first temperature flow monitoring unit 5, the temperature of flue gas at the inlet of the air-mixing cooler 8 is always kept higher than a regeneration temperature window of dioxin, and the phenomenon that the water-cooling cyclone separator overcools the flue gas to cause dioxin regeneration is avoided.
Or a first temperature and flow monitoring unit 5 can be arranged between the water-cooling cyclone separator inner cylinder 4 and the air-mixing cooler 8, a second temperature and flow monitoring unit 6 can be arranged between the air-mixing cooler 8 and the bag-type dust collector 11, and a third temperature and flow monitoring unit 7 can be arranged on the circulating flue; the temperature detected by the first temperature and flow monitoring unit is T1Flow rate of F1(ii) a The temperature detected by the second temperature and flow monitoring unit is T2Flow rate of F2(ii) a The temperature detected by the third temperature flow monitoring unit is T3Flow rate of F3(ii) a The flue gas temperature and the flow at the first temperature flow monitoring unit 5, the second temperature flow monitoring unit 6 and the third temperature flow monitoring unit 7 are controlled to meet the following requirements: t is1*F1+T3*F3＝T2*F2。
Furthermore, a part of the flue gas after the fine dust removal by the bag-type dust remover 11 passes through the smoke exhaust fan 15 and is exhausted from the chimney 17. To ensure the internal flue gas circulation balance, the flow at the fourth flow control unit 16 can be controlled by adjusting the smoke damper 14 to be equal to the flow measured at the first temperature and flow monitoring unit, i.e. F4＝F1。
Furthermore, the flue gas entering the circulating flue needs to be further cooled by the water-cooling heat exchanger 13, so that the flue gas in the air-mixing cooler 8 can be quenched and cooled more effectively. One or more water-cooled heat exchangers 13 can be selected in series according to actual conditions. As shown by theoretical calculation and experimental data, dioxin regenerationThe temperature window is 250 ℃ to 450 ℃, and the temperature T of the inlet 2 of the air mixing cooler 8 is controlled1At 500 ℃ and an outlet temperature T2200 ℃, if the water-cooled heat exchanger 13 can cool the circulating flue gas to about 60 ℃, the required circulating flue gas amount F3For an electric arc furnace 1 flue gas quantity F1About 2 times of the total weight of the product. The lower the temperature of the water-cooled heat exchanger 13 capable of cooling the circulating flue gas, the less the amount of the circulating flue gas required, and the lower the energy consumption of the air mixing fan 9.
The device and the system are provided with the atmospheric access valve 10, when a cooling device in the system breaks down to cause poor smoke cooling effect, the atmospheric access valve 10 can be opened emergently to mix part of cold air, and smoke overtemperature in an accident state is avoided. All dust in the flue gas is firstly discharged through the dust discharge port at the lower part of the outer barrel 3, and the rest dust is discharged through the cloth bag dust removal dust discharge port 12, so that a large amount of dust is prevented from being accumulated in the system.
Finally, the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the scope of the claims of the present invention.
Claims (8)
1. A flue gas quenching dust removal device for inhibiting the regeneration of dioxin is characterized by comprising a water-cooling cyclone separator, an air-mixing cooler, a bag-type dust remover and a chimney which are arranged in sequence; one end of the outlet of the bag-type dust collector is connected with the chimney, and the other end of the outlet of the bag-type dust collector is connected with the air-mixing cooler through the circulating flue; and the air mixing cooler is internally provided with an air mixing fan.
2. The flue gas quenching and dedusting device for inhibiting the dioxin regeneration as claimed in claim 1, wherein the water-cooled cyclone separator comprises an inner cylinder and an outer cylinder which are composed of water-cooled pipes; the inner cylinder is communicated with the outer cylinder, and the inner cylinder is connected with the air mixing cooler.
3. The flue gas quenching and dust removing device for inhibiting the regeneration of dioxin in claim 2, wherein the water-cooled cyclone separator further comprises an inlet connected with the outer cylinder, and the inlet is also composed of a water-cooled tube.
4. The flue gas quenching and dust removing device for suppressing the regeneration of dioxin in claim 1, wherein a first temperature and flow monitoring unit is provided between the water-cooled cyclone separator and the air-mixed cooler, a second temperature and flow monitoring unit is provided between the air-mixed cooler and the bag-type dust remover, and a third temperature and flow monitoring unit is provided on the circulating flue.
5. The flue gas quenching and dedusting device for inhibiting the dioxin regeneration as claimed in claim 1, wherein at least one set of water-cooled heat exchangers is further arranged on the circulating flue.
6. The flue gas quenching and dust removing device for inhibiting the regeneration of dioxin in claim 1, wherein a smoke exhaust fan is further arranged between the bag-type dust remover and the chimney.
7. The flue gas quenching and dust removing device for inhibiting the regeneration of dioxin in claim 6, wherein a smoke exhaust adjusting valve is further arranged between the smoke exhaust fan and the bag-type dust remover.
8. The flue gas quenching and dedusting device for inhibiting the dioxin regeneration as in claim 1, wherein an atmosphere access valve is further arranged on the circulating flue.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021083416.1U CN212440597U (en) | 2020-06-12 | 2020-06-12 | Flue gas quenching dust collector that restraines dioxin regeneration |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021083416.1U CN212440597U (en) | 2020-06-12 | 2020-06-12 | Flue gas quenching dust collector that restraines dioxin regeneration |
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| CN212440597U true CN212440597U (en) | 2021-02-02 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111530216A (en) * | 2020-06-12 | 2020-08-14 | 中冶赛迪技术研究中心有限公司 | Flue gas quenching and dust removing device for inhibiting dioxin regeneration and control method |
| CN115823578A (en) * | 2022-11-24 | 2023-03-21 | 四川川锅锅炉有限责任公司 | Two-stage cyclone liquid slag-condensing boiler for burning high-alkali coal |
-
2020
- 2020-06-12 CN CN202021083416.1U patent/CN212440597U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111530216A (en) * | 2020-06-12 | 2020-08-14 | 中冶赛迪技术研究中心有限公司 | Flue gas quenching and dust removing device for inhibiting dioxin regeneration and control method |
| CN115823578A (en) * | 2022-11-24 | 2023-03-21 | 四川川锅锅炉有限责任公司 | Two-stage cyclone liquid slag-condensing boiler for burning high-alkali coal |
| CN115823578B (en) * | 2022-11-24 | 2023-11-17 | 四川川锅锅炉有限责任公司 | Two-stage cyclone liquid slag condensing boiler for burning high-alkali coal |
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