CN211133498U - Equipment for treating waste gas generated by carbonizing blast furnace gas ash and electric furnace ash - Google Patents
Equipment for treating waste gas generated by carbonizing blast furnace gas ash and electric furnace ash Download PDFInfo
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- CN211133498U CN211133498U CN201922032328.2U CN201922032328U CN211133498U CN 211133498 U CN211133498 U CN 211133498U CN 201922032328 U CN201922032328 U CN 201922032328U CN 211133498 U CN211133498 U CN 211133498U
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Abstract
The utility model discloses a blast furnace gas ash, electric stove ash carbonization accompany and burn waste gas treatment equipment relates to the waste gas treatment field, including pipeline, install coagulation ware, forced air cooling radiator, pulsed sack dust collector, first U-shaped condenser pipe, second U-shaped condenser pipe, centrifugal fan, first absorption tower that sprays, second spray absorption tower and water smoke interceptor on pipeline of pipeline in proper order. The utility model discloses a waste gas treatment equipment can effectively, fast, stably purify the improvement to the waste gas that blast furnace gas ash, electric stove ash carbonization accompany and burn the production, the emission of pollution in the waste gas that has significantly reduced, green, just the utility model discloses a waste gas treatment equipment uses reliably, long service life.
Description
Technical Field
The utility model relates to a blast furnace gas ash and electric furnace ash that produce among the iron-making/steelmaking process are accompanied in the carbonization and are burnt produced waste gas treatment technical field of resource utilization in-process, specifically say one kind and utilize sack dust removal to retrieve metal dust and multistage spray desulfurization comprehensive combination waste gas treatment technique, can realize that the dry process of metal dust is retrieved and contain the effective desulfurization of sulphur waste gas and administer.
Background
Blast furnace gas ash is the waste produced by blast furnace ironmaking. In the blast furnace smelting process, impurities such as zinc, aluminum, lead and the like contained in iron ore raw materials are reduced under a high-temperature condition to form steam, and the steam is discharged together with dust particles such as ores, coke, fluxes and the like along with blast furnace gas and is removed by a wet or dry dust removal system, so that the iron ore raw materials are one of main solid emissions of iron and steel enterprises. The blast furnace gas ash has complex chemical components, and comprises iron, metals such as lead, zinc, aluminum, copper, bismuth, indium, cadmium and the like and alkali metal oxides except incompletely combusted carbon, wherein the content of iron is the highest, and carbon is the second, and the sum of the iron content and the alkali metal oxides is about 45-65%. The gas ash is gray black powder in shape and fine in granularity, wherein particles smaller than 200 meshes (74 mu m) account for 97-100%, the average particle size is only 20-25 mu m, and nonferrous metals such as zinc, copper and the like are mainly distributed in the grade of fine particles smaller than 200 meshes.
The electric furnace dust is one of iron-containing dust and mud, and is collected after the electric furnace dust is processed by a collector, a flue and a bag type dust collector in the process of electric furnace steelmaking, and the production amount of each ton of steel is about 5-20 kg. Because the electric furnace is mainly used for smelting galvanized plates and other zinc-and lead-containing anticorrosive steel, the zinc and lead contents of the electric furnace ash are higher. The Zn content can reach 5-15%, and partially even 30%. It also contains a certain amount of Pb (3-5%), has a high MgO content of about 15%, and contains a large amount of unburned carbon.
Because the particle size of the blast furnace gas ash and the electric furnace ash is small, the density is small, and the blast furnace gas ash and the electric furnace ash are easy to fly in the atmosphere and form fly dust which has great harm to human bodies; if the heavy metals are directly discharged into the environment without treatment, not only can serious harm be caused to human bodies, but also the heavy metals such as zinc, lead and the like in the heavy metals easily enter the underground water environment under the erosion of rainwater, thereby generating adverse effects on the ecological environment system.
Blast furnace gas ash and electric furnace ash mainly comprise mineral particles, coke powder, flux dust and the like, are rich in nonferrous metals such as iron, carbon, aluminum, zinc and the like, and are valuable secondary resources. At present, the main refining mode of blast furnace gas ash and electric furnace ash is a rotary kiln carbon reduction method, wherein metals such as iron, zinc, lead and the like are reduced, heavy metal substances are sublimated under a high-temperature environment to be changed into gas, and the gas is convenient to capture and recycle at a rear section. The waste gas contains a large amount of metal particles, carbon monoxide and a small amount of sulfur dioxide
The main process of the existing rotary kiln carbon reduction method for treating waste gas by using blast furnace gas ash and electric furnace ash is wet spraying, mainly comprising the steps of washing metal substances in the waste gas by using a spraying method, precipitating the metal substances, drying and purifying, and recycling water.
The main process of the existing rotary kiln carbon reduction method waste gas treatment of blast furnace gas ash and electric furnace ash is wet spraying, mainly comprising the steps of washing metal substances in waste gas by a spraying method (wet recovery method), precipitating the metal substances, carrying out filter pressing, drying and purifying, and recycling water.
Because the waste gas contains sulfur dioxide, the sulfur dioxide is easy to dissolve in water to generate sulfurous acid, the sulfurous acid is easy to be oxidized to generate sulfuric acid, and the sulfurous acid and the sulfuric acid are easy to dissolve metal substances, such as zinc oxide, sodium oxide, potassium oxide, lead oxide and other heavy metals, and the like, which affect the recovery of the metal substances. And when the sulfur dioxide is gradually absorbed and reaches a saturated state, the spraying solution does not absorb the sulfur dioxide, the sulfur dioxide in the discharged waste gas is extremely easy to exceed the standard, and the spraying solution cannot be continuously recycled and needs to be replaced. The changed spraying solution belongs to secondary pollution, can not be directly discharged, and can be discharged after being treated to reach the standard.
SUMMERY OF THE UTILITY MODEL
To the problems in the prior art, the utility model provides a waste gas treatment equipment is accompanied to burn in carbonization of blast furnace gas ash, electric stove ash.
In order to achieve the purpose, the utility model discloses a following technical scheme realizes:
a kind of blast furnace gas ash, electric stove ash carbonization accompany burning waste gas treatment equipment, including the conveying pipeline, install the coagulator, air-cooled radiator, pulsed sack dust-collecting equipment, first U-shaped condenser pipe, second U-shaped condenser pipe, centrifugal fan, first spray absorption tower, second spray absorption tower and water fog interceptor sequentially on the pipeline of the conveying pipeline; and a temperature sensor and 1 or more bypass valves are arranged on a conveying pipeline between the air-cooled radiator and the pulse type cloth bag dust removal device, and the temperature sensor is electrically connected with the bypass valves and is linked with the bypass valves.
Furthermore, the bottoms of the first U-shaped condenser pipe and the second U-shaped condenser pipe are respectively provided with a support frame, each support frame comprises a bearing plate, a support rod arranged on the side portion of the bearing plate and a support plate arranged at the bottom end of the support rod, the support plates are fixedly connected with the ground through fastening bolts, and rubber pads are arranged between the bearing plates and the first U-shaped condenser pipe as well as between the bearing plates and the second U-shaped condenser pipe.
Furthermore, the waste gas treatment equipment also comprises an adjusting tank, wherein drain valves are arranged at the bottoms of the first U-shaped condensing pipe and the second U-shaped condensing pipe, the water outlet ends of the drain valves are connected with a first water pipe, the water outlet end of the first water pipe is communicated to the adjusting tank, and a hydrocyclone is arranged in the adjusting tank; the water outlet ends of the first spray absorption tower and the second spray absorption tower are connected with a second water pipe, and the water outlet end of the second water pipe is communicated to the regulating tank; and a third water pipe is connected between the water inlet ends of the first spray absorption tower and the second spray absorption tower and the regulating tank, and a water pump is arranged on the third water pipe.
Preferably, the inner cloth bag in the pulse type cloth bag dust removal device is a PTFE (polytetrafluoroethylene) film-coated filter bag.
Furthermore, the surface of the external machine body of the pulse type cloth bag dust removal device is provided with an insulation board.
Preferably, the heat insulation board is a rock wool board.
Preferably, the first spray absorption tower and the second spray absorption tower are made of 316 stainless steel plates.
The utility model discloses following beneficial effect has: the utility model discloses a waste gas treatment equipment can effectively, fast, stably purify the improvement to the waste gas that blast furnace gas ash, electric stove ash carbonization accompany and burn the production, the emission of pollution in the waste gas that has significantly reduced, green, just the utility model discloses a waste gas treatment equipment uses reliably, long service life, and is concrete:
1. the intervention of the condenser and the preliminary dust removal are carried out, so that the sedimentation and blockage of the internal pipe fitting of the air-cooled radiator are avoided, and on the other hand, high-boiling-point substances are desublimated, and the scaling phenomenon of the wall of a rear-stage radiating pipeline is avoided;
2. the air-cooled radiator, the bypass valve and the temperature sensor are linked, so that the temperature is effectively stabilized, and the temperature is ensured to be 150 +/-20 ℃ when entering the pulse type cloth bag dust removal device;
3. the heat-insulating layer arranged on the pulse type bag dust collector ensures that the temperature loss is less than or equal to 10 percent, namely ensures that the temperature of the waste gas is over 100 ℃ after passing through the bag dust collector, and ensures that the problem of bag blockage caused by water vapor condensation in the bag dust collector is avoided;
4. a cloth bag in the pulse type cloth bag dust removal device adopts a PTFE special film-coated filter bag, so that the filtering effect of metal substances is ensured to be more than 99.99 percent;
5. two U-shaped condensing pipes are selected to be connected in series, so that the temperature of the waste gas can be reduced to be below 100 ℃, and water vapor can be effectively removed;
6. two spraying absorption towers are selected to carry out spraying absorption operation on the waste gas, SO that harmful substances (such as SO2, metal substances which are not completely filtered and the like) are ensured to be thoroughly washed;
7. and the selected water mist interceptor is used for mechanically intercepting and demisting the waste gas, removing water vapor in the waste gas and discharging the waste gas after whitening.
Drawings
The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention, and together with the description serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic structural view of the apparatus of the present invention;
FIG. 2 is a partial schematic structural view of the support frame of FIG. 1;
labeled as: 1. a delivery conduit; 2. a condenser; 3. an air-cooled radiator; 4. a pulse type cloth bag dust removal device; 5. a first U-shaped condenser tube; 6. a second U-shaped condenser tube; 7. a centrifugal fan; 8. a first spray absorption tower; 9. a second spray absorption tower; 10. a water mist interceptor; 11. a temperature sensor; 12. a bypass valve; 13. a regulating tank; 14. a drain valve; 15. a first water pipe; 16. a second water pipe; 17. a third water pipe; 18. a water pump; 19. a support frame; 191. a support plate; 192. a strut; 193. a support plate; 194. and (7) a rubber pad.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the drawings in the embodiments of the present invention are combined below to clearly and completely describe the technical solutions in the embodiments of the present invention.
In the description of the present invention, it is to be noted that, unless otherwise specified, "a plurality" means two or more; the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "top", "bottom", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; the connection can be mechanical connection or circuit connection; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present invention can be understood as the case may be, by those of ordinary skill in the art.
A device for treating waste gas generated by carbonizing blast furnace gas ash and electric furnace ash and burning together is shown in figure 1, and the device is mainly structured as follows:
the device comprises a conveying pipeline 1, wherein a condenser 2, an air cooling radiator 3, a pulse type bag dust removal device 4, a first U-shaped condensing pipe 5, a second U-shaped condensing pipe 6, a centrifugal fan 7, a first spraying absorption tower 8, a second spraying absorption tower 9 and a water mist interceptor 10 are sequentially arranged on a pipeline of the conveying pipeline 1.
A temperature sensor 11 and 1 or more bypass valves 12 are arranged on the conveying pipeline 1 between the air-cooled radiator 3 and the pulse type bag dust collector 4, and the temperature sensor 11 is electrically connected with the bypass valves 12 and is linked with the bypass valves 12;
the waste gas treatment equipment further comprises a regulating tank 13, a drain valve 14 is arranged at the bottom of the U-shaped condensing pipe, the water outlet end of the drain valve 14 is connected with a first water pipe 15, the water outlet end of the first water pipe 15 is communicated into the regulating tank 13, and a hydrocyclone (not shown) is arranged in the regulating tank 13; the water outlet ends of the first spray absorption tower 8 and the second spray absorption tower 9 are connected with a second water pipe 16, the water outlet end of the second water pipe 16 is communicated to the regulating tank 13, in addition, a third water pipe 17 is connected between the water inlet ends of the first spray absorption tower 8 and the second spray absorption tower 9 and the regulating tank 13, and a water pump 18 for providing power is installed on the third water pipe 17.
Based on the foregoing, as shown in fig. 2, in order to facilitate the stability of the first U-shaped condensation pipe 5 and the second U-shaped condensation pipe 6, the bottom of each of the first U-shaped condensation pipe 5 and the second U-shaped condensation pipe 6 is provided with a support frame 19, each support frame 19 includes a support plate 191, support rods 192 vertically arranged on the side portions of the two sides of the support plate 191, and a support plate 193 arranged at the bottom ends of the support rods 192, the support plate 193 is fixedly connected with the ground through fastening bolts; in addition, rubber pads 194 are arranged between the supporting plate 191 and the first U-shaped condenser pipe 5 and between the supporting plate and the second U-shaped condenser pipe 6, and the rubber pads 194 are used for shock absorption and protection, so that the service life of each U-shaped condenser pipe is prolonged.
Preferably, the internal cloth bag (not shown) in the pulse type cloth bag dust collector 4 is a PTFE film filter bag.
Further, an insulation board (not shown), preferably a rock wool board, is fixedly connected to the surface of the external machine body of the pulse type bag dust collector 4 through bolts.
Preferably, the first spray absorption tower 8 and the second spray absorption tower 9 are made of 316 stainless steel plates, so that the corrosion prevention effect is good.
The utility model discloses a waste gas treatment equipment theory of operation and flow as follows:
(1) under the action of a centrifugal fan 7, introducing high-temperature waste gas generated by carbonizing and burning blast furnace dust and electric furnace dust of the rotary kiln into a condenser 2 through a conveying pipeline 1, cooling the waste gas to 200-300 ℃ from 350-450 ℃, condensing and desublimating high-temperature gas-phase substances under the cooling of the condenser 2, settling large-particle dust into an ash bucket, and feeding small-particle substances into the conveying pipeline 1;
(2) after passing through the condenser 2, the waste gas is guided into the air-cooled radiator 3 at a certain speed, and under the action of the air-cooled radiator 3, the temperature of the waste gas is reduced from 200-300 ℃ to 150 (+ -20 ℃);
(3) and then the waste gas enters the pulse type bag dust collector 4 after being detected by the bypass valve 12 and the temperature sensor 11. When the temperature sensor 11 is linked with the bypass valve 12, when the temperature of the waste gas in the conveying pipeline 1 is higher than 170 ℃, the bypass valve 12 is opened, the fresh air is mixed for cooling, and when the temperature is lower than 150 ℃, the bypass valve 12 is closed;
(4) in the pulse type cloth bag dust removing device 4, the whole dust removing efficiency can reach 99.99 percent by the filtration of the inner cloth bag, and the dust concentration is reduced to 1.7mg/m3The thickness of the heat preservation plate arranged outside the dust removal device is more than or equal to 75mm, so that the temperature loss of the waste gas passing through the dust removal device is less than or equal to 10%, and the water vapor in the waste gas is prevented from being condensed in a cloth bag in the dust removal device to influence the use of the dust removal device;
(5) after passing through a dust removal device, the waste gas enters a first U-shaped condensing pipe 5 and a second U-shaped condensing pipe 6 in sequence to be cooled, so that the temperature of the waste gas is controlled below 100 ℃; when the temperature is reduced to be below 100 ℃, a large amount of water vapor is separated out from each U-shaped condensing pipe and flows to the bottom along the inner pipe wall of the U-shaped condensing pipe, so that the drain valves 14 are correspondingly arranged at the water accumulation areas at the bottoms of the U-shaped condensing pipes, and then the condensed water is introduced into the regulating tank 13 through the first water pipes 15;
(6) then the waste gas enters a first spray absorption tower 8 and a second spray absorption tower 9 in sequence, the empty tower flow rate of the absorption towers is controlled at 1m/s, the gas-liquid ratio is 1:3, the coverage rate is 300 percent, NaOH (the mass fraction is 5 percent) and Na are adopted2CO3(5% by mass) and Ca (OH)2(the mass fraction is 10%) mixed solution is used as starting solution to absorb the waste gas, and the sprayed solution flows into the regulating tank 13 through the second water pipe 16 to be precipitated;
(7) spraying waste gas, wherein the temperature of the waste gas is about 60-80 ℃, then enabling the waste gas to enter a water mist interceptor 10, mechanically intercepting and demisting the waste gas, removing water vapor, and finally enabling the flue gas to enter a 30-meter high altitude to be discharged;
(8) wherein Ca (OH) is added into the adjusting tank 132Stabilizing the pH of the absorption solution at a value of between 8 and 9, Ca (OH)2When sulfurous acid or sulfuric acid is encountered, CaSO is generated3Or CaSO4And (4) precipitating, concentrating the precipitate by using a hydrocyclone after primary precipitation, and returning the concentrated water to the spray tower for recycling through a water pump 18 and a third water pipe 17.
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 described in the foregoing embodiments, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. The utility model provides a blast furnace gas ash, electric stove ash carbonization accompany burns waste gas treatment equipment, includes pipeline (1), its characterized in that, installs coagulator (2), forced air cooling radiator (3), pulsed sack dust collector (4), first U-shaped condenser pipe (5), second U-shaped condenser pipe (6), centrifugal fan (7), first spraying absorption tower (8), second spraying absorption tower (9) and water smoke interceptor (10) on the pipeline of pipeline (1) in proper order.
2. The blast furnace gas ash and electric furnace ash carbonization combustion-supporting waste gas treatment equipment as claimed in claim 1, wherein a temperature sensor (11) and 1 or more bypass valves (12) are arranged on the conveying pipeline (1) between the air-cooled radiator (3) and the pulse type bag dust removal device (4), and the temperature sensor (11) and the bypass valves (12) are electrically connected and linked.
3. The blast furnace gas ash and electric furnace ash carbonization combustion-supporting waste gas treatment equipment as claimed in claim 1, wherein the bottoms of the first U-shaped condensation pipe (5) and the second U-shaped condensation pipe (6) are respectively provided with a support frame (19), each support frame (19) comprises a bearing plate (191), a support rod (192) arranged on the side of the bearing plate (191) and a support plate (193) arranged at the bottom end of the support rod (192), the support plates (193) are fixedly connected with the ground through fastening bolts, and rubber gaskets (194) are arranged between the bearing plates (191) and the first U-shaped condensation pipe (5) and the second U-shaped condensation pipe (6).
4. The blast furnace gas ash and electric furnace ash carbonization combustion-accompanying waste gas treatment equipment as claimed in claim 1, wherein the waste gas treatment equipment further comprises a regulating reservoir (13), drain valves (14) are arranged at the bottoms of the first U-shaped condensing pipe (5) and the second U-shaped condensing pipe (6), a water outlet end of each drain valve (14) is connected with a first water pipe (15), a water outlet end of each first water pipe (15) is communicated into the regulating reservoir (13), and a hydrocyclone is arranged in the regulating reservoir (13); the water outlet ends of the first spray absorption tower (8) and the second spray absorption tower (9) are connected with a second water pipe (16), and the water outlet end of the second water pipe (16) is communicated to the regulating tank (13); a third water pipe (17) is connected between the water inlet ends of the first spray absorption tower (8) and the second spray absorption tower (9) and the regulating tank (13), and a water pump (18) is arranged on the third water pipe (17).
5. The blast furnace gas ash and electric furnace ash carbonization combustion-accompanying waste gas treatment equipment as claimed in claim 1, wherein an inner cloth bag in the pulse type cloth bag dust removal device (4) is a PTFE membrane filter bag.
6. The blast furnace gas ash and electric furnace ash carbonization combustion-accompanying waste gas treatment equipment as claimed in claim 1, wherein an insulation board is arranged on the surface of the external machine body of the pulse type cloth bag dust removal device (4).
7. The blast furnace gas ash and electric furnace ash carbonization combustion-accompanying waste gas treatment device as claimed in claim 6, wherein the heat insulation board is a rock wool board.
8. The blast furnace gas ash and electric furnace ash carbonization combustion-accompanying exhaust gas treatment equipment as claimed in claim 1, wherein the first spray absorption tower (8) and the second spray absorption tower (9) are made of 316 stainless steel plates.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922032328.2U CN211133498U (en) | 2019-11-22 | 2019-11-22 | Equipment for treating waste gas generated by carbonizing blast furnace gas ash and electric furnace ash |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922032328.2U CN211133498U (en) | 2019-11-22 | 2019-11-22 | Equipment for treating waste gas generated by carbonizing blast furnace gas ash and electric furnace ash |
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| CN211133498U true CN211133498U (en) | 2020-07-31 |
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| CN201922032328.2U Active CN211133498U (en) | 2019-11-22 | 2019-11-22 | Equipment for treating waste gas generated by carbonizing blast furnace gas ash and electric furnace ash |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114350959A (en) * | 2021-12-03 | 2022-04-15 | 中冶赛迪技术研究中心有限公司 | Device and process flow for preparing zinc powder from zinc-containing electric furnace ash |
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2019
- 2019-11-22 CN CN201922032328.2U patent/CN211133498U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114350959A (en) * | 2021-12-03 | 2022-04-15 | 中冶赛迪技术研究中心有限公司 | Device and process flow for preparing zinc powder from zinc-containing electric furnace ash |
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