CN113893627A - Dust treatment system and method in slag dumping and dragging process of steel slag hot-stewing pool - Google Patents
Dust treatment system and method in slag dumping and dragging process of steel slag hot-stewing pool Download PDFInfo
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- CN113893627A CN113893627A CN202111202860.XA CN202111202860A CN113893627A CN 113893627 A CN113893627 A CN 113893627A CN 202111202860 A CN202111202860 A CN 202111202860A CN 113893627 A CN113893627 A CN 113893627A
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Abstract
The invention discloses a dust treatment system in a slag dumping and dredging process of a steel slag hot stewing pool, which comprises a stewing pool, a blower, a dust hood, an induced draft fan, a wet dust removal tower, a pneumatic high-efficiency dust removal demister, a circulating water pump, a slurry discharge pump and a plate and frame filter press, wherein the dust hood is connected and arranged on a stewing pool cover, the blower is arranged on one side opposite to the input end of the dust hood at intervals, the output end of the dust hood is connected and arranged with a flue gas inlet of the wet dust removal tower through the induced draft fan, and the pneumatic high-efficiency dust removal demister is coaxially arranged on a tower body between a flue gas outlet and a water washing layer. The system of the invention breaks through the limitation of dust removal of the existing slag stewing pool, collects and processes the dust generated in the slag dumping and fishing process of the slag stewing pool, adopts the combination of dust blowing and dust sucking cover and wet dust removal technology, has good dust collecting and processing effect, low investment cost and low operating cost, ensures that the discharged dust is less than 10mg/Nm3, and meets the latest national environment-friendly emission requirement.
Description
Technical Field
The invention belongs to the technical field of slag stewing pool dust removal, and particularly relates to a dust treatment system and a dust treatment method in a slag dumping and dragging process of a steel slag hot stewing pool.
Background
The purpose of the steel slag treatment is to finish the cooling, pulverization and magnetic separation of high-temperature liquid steel slag generated in the steel-making (converter and electric furnace) process. The mainstream process for treating the steel slag of domestic iron and steel enterprises comprises the following steps: the hot splashing method, the hot stewing pool method, the rolling hot stewing method, the roller method and the air quenching method are adopted for treating the hot steel slag in most domestic steel enterprises, wherein the hot stewing pool method has the advantages of small investment, simple maintenance and low operation cost. The hot stewing pool method can generate a large amount of dust in the process of pouring and fishing out the steel slag, because of the characteristics of the structure of the hot stewing pool and the limitation of the operation in the process of deslagging and fishing out the slag, the collection and treatment difficulty of the dust is larger, and at present, part of steel enterprises adopting the hot stewing method in China have treated the dust generated in the deslagging process, but the dust generated in the deslagging and fishing out the slag is not treated. Iron and steel enterprises using the hot stewing pond method do not carry out dust treatment on the process, so that the dust content in a stewing pond factory building exceeds the standard, the working environment is severe, and the problem is difficult to solve by a steel slag hot stewing technology for many years. At the present stage, the national environmental protection requirement is increasingly strict, and the emission standard of the unorganized dust is 8mg/m according to the latest environmental protection requirement3How to collect and treat the dust generated by the steel slag in the deslagging and slag-dragging process is a problem which needs to be solved urgently in domestic steel enterprises.
Through searching, the following patent publications related to the patent application of the invention are found:
1. a method and system (CN 110694399A) for treating steel slag flue gas, wherein high-temperature liquid steel slag generated by steel making is conveyed into a hot stewing pool, water is sprayed into the hot stewing pool to cool and pulverize the high-temperature liquid steel slag to obtain dust-containing steam, the dust-containing steam is conveyed to a spray tower through a pipe network, the dust-containing steam is sprayed in the spray tower to obtain dust-containing flue gas, the dust-containing flue gas is dehydrated through a dehydrator to obtain dry flue gas, the dry flue gas is conveyed to a wet absorption tower through an induced draft fan, and the dry flue gas is discharged into the atmosphere after being dedusted and whitened by the wet absorption tower; the invention sequentially treats the high-temperature liquid steel slag, then passes through the dust-containing steam, the dust-containing flue gas and the dry flue gas, finally passes through the wet absorption tower for filtration and then is discharged into the atmosphere,the dust concentration reaches the national ultra-low standard, namely the dust concentration is less than 10mg/m3The method meets the requirement of deep purification of the steel slag waste gas, and has the advantages of good dust removal effect, low cost, safety, environmental protection and no pollution.
2. The utility model provides a dust pelletizing system (CN 208018351U) for hot braising slag is handled, includes the entrapment cover, flue gas dewatering defogging device, flue gas heating device, dust collector, air exhauster and the emission chimney that connect gradually through the tuber pipe, just still through the supplementary grey device of scribbling in advance of pipe connection filter material on the tuber pipe between flue gas heating device and the dust collector, tuber pipe and dust collector all set up thermal-insulated heat preservation, a dust pelletizing system for hot braising slag is handled prevents that the flue gas dewfall deliquesces hardens, blocks up tuber pipe and dust removal filter material, causes the too early inefficacy of dust pelletizing system, extension dust pelletizing system's life.
By contrast, the patent application of the invention and the patent publications have different links for processing the braising slag dust, so that the invention has great essential difference.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a system and a method for treating flying dust in the deslagging and dredging process of a steel slag hot-stewing pool.
In order to achieve the purpose, the invention adopts the technical scheme that:
a dust treatment system in the slag dumping and dragging process of a steel slag hot stewing pool comprises a stewing pool, a blower, a dust hood, a draught fan, a wet dust removing tower, a pneumatic high-efficiency dust removing demister, a circulating water pump, a slurry discharging pump and a plate and frame filter press, the top of the slag stewing pool is movably connected with a slag stewing pool cover, the slag stewing pool cover is connected with a dust hood, one side opposite to the input end of the dust hood is provided with a blower at intervals, the output end of the dust hood is connected with a flue gas inlet of a wet dust removal tower through a draught fan, the wet dust removal tower comprises a tower body, a flue gas outlet, a water washing layer, a flue gas inlet, a dust removal section and a slurry storage tank, the tower body is sequentially and coaxially provided with a flue gas outlet, a water washing layer, a flue gas inlet, a dust removal section and a slurry storage tank at intervals from top to bottom, a pneumatic high-efficiency dust and mist removing device is coaxially arranged on the tower body between the flue gas outlet and the water washing layer;
the input end of the circulating water pump is connected with the pulp storage tank, the output end of the circulating water pump is connected with the input end of the water washing layer, and the output end of the water washing layer can downwards output dedusting cleaning water;
the slurry storage pool is connected with the input end of the plate-and-frame filter press through a slurry discharge pump, the output end of the plate-and-frame filter press comprises a mud cake output end and a clean water output end, and the clean water output end is connected with the slurry storage pool.
Further, the system further comprises a demister flushing system, a demister flushing pump and a process water tank, wherein the demister flushing system is arranged in the tower body between the pneumatic high-efficiency dust removal demister and the flue gas outlet, the process water tank is connected with the demister flushing system through the demister flushing pump, and the demister flushing system can flush the pneumatic high-efficiency dust removal demister.
Further, the hair dryer sets up two.
A method for treating dust in the slag dumping and dragging process of a steel slag hot stewing pool by using the treatment system comprises the following steps:
(1) high-temperature liquid steel slag generated in the steelmaking process is put into or taken out of a slag stewing pool by a crane, dust can be generated in the process, and dust is blown towards a dust hood by a blower;
(2) the dust generated in the slag dumping and slag salvaging processes of the slag stewing pool is conveyed to the wet dust removal tower through the induced draft fan under the double functions of the blower and the dust hood;
(3) a washing layer is arranged in the wet dust removal tower, dust removal cleaning water in a water storage tank below the dust removal section is conveyed to the washing layer by a circulating water pump, and the washing layer is used for washing and removing dust from the dust-containing flue gas;
(4) after primary dust removal through water washing, the flue gas enters a pneumatic high-efficiency dust removal demister at the upper part of a dust removal tower, dust-containing flue gas is further efficiently removed, and the treated flue gas is discharged from a flue gas outlet at the top of the tower;
(5) along with continuous circulation, the dust removal cleaning water washes dust-containing flue gas, dust in the water storage pool is enriched, the dust-containing concentrated solution is conveyed to a plate-and-frame filter press through a slurry discharge pump, the plate-and-frame filter press performs solid-liquid separation on the concentrated solution to generate a filter cake for outward transportation, and the clear water is recycled to the wet method dust removal tower for reuse.
The invention has the advantages and effects that:
1. the system of the invention breaks through the limitation of dust removal of the existing slag stewing pool, collects and processes the dust generated in the slag dumping and fishing process of the slag stewing pool, adopts the combination of dust blowing and dust sucking cover and wet dust removal technology, has good dust collecting and processing effect, low investment cost and low operating cost, ensures that the discharged dust is less than 10mg/Nm3, and meets the latest national environment-friendly emission requirement.
2. The system has high dust removal efficiency, and the removal rate of particles with the particle size of 1-5 um is more than 90 percent, and the removal rate of particles with the particle size of 10um is 100 percent.
3. The invention adopts a pneumatic high-efficiency dedusting and demisting technology, a cyclone plate is additionally arranged in a multistage double-pneumatic cyclone dedusting and demisting device cylinder to enable flue gas to rotate in the cyclone cylinder, severe rotation and disturbance of gas-liquid phases are formed above the cyclone device, so that fine liquid drops, fine dust particles, aerosol and other fine particles in the flue gas collide with each other and are agglomerated into large liquid drops, then the flue gas is enabled to move outwards in a centrifugal mode under the structural action of the pneumatic cyclone device, the large liquid drops formed by polymerization collide with the cyclone cylinder wall and are captured and absorbed by a liquid film of the cyclone cylinder wall, and the high-efficiency dedusting and demisting are realized through regular washing of washing water.
4. The system of the invention integrates the smoke tower into one, thus effectively saving investment and occupied area.
5. The high-temperature liquid steel slag generated in the steel-making (converter and electric furnace) process is loaded into (or fished out of) a slag stewing pool by a crane, and a large amount of dust can be generated in the process. The dedusting tower is provided with a slurry discharging pump, when the dust concentration in the water storage pool at the lower part of the dedusting tower is higher, the slurry discharging pump conveys the dust-containing concentrated solution to the plate-and-frame filter press, and clear water generated after the concentrated solution passes through the plate-and-frame filter press returns to the slurry storage pool of the dedusting tower, so that the mud and the dust are transported outside. The device is provided with a process water tank and a flushing water pump, and the pneumatic high-efficiency dust removal demister at the upper part of the dust removal tower is flushed regularly. The invention adopts the combination of dust blowing and dust collection technologies and wet dust collection technologies, so that the raised dust is effectively collected and treated, and the national emission standard is reached. The invention has good effect of collecting and treating the flying dust, low operation cost, safety, environmental protection and no secondary pollution.
Drawings
FIG. 1 is a schematic diagram of a structural connection of the system of the present invention.
Detailed Description
The present invention will be further described with reference to specific examples, which are intended to be illustrative, not limiting and are not intended to limit the scope of the invention.
The raw materials used in the invention are all conventional commercial products if no special description is provided, the method used in the invention is all conventional methods in the field if no special description is provided, and the mass of all the materials used in the invention is the conventional use mass. The structures, connection relations, etc., which are not described in detail in the present invention, can be understood as conventional technical means in the art.
The utility model provides a slag-dumping and dragging for sediment process raise dust processing system in slag hot stewing pond, as shown in figure 1, the system includes stewing pond 4, hair-dryer 1, suction hood 3, draught fan 5, wet process gas wash tower, pneumatic high-efficient dust removal defroster 73, circulating water pump 6, fan pump 8, filter press 9, the top activity in stewing pond is connected and is set up stewing pond lid 2, and stewing pond is covered to be connected and is provided with the suction hood, and the relative one side interval of suction hood's input is provided with the hair-dryer, and the output of suction hood is connected the setting through the draught fan with the flue gas entry of wet process gas wash tower, and this wet process gas wash tower includes tower body 72, exhanst gas outlet 71, washing layer 74, flue gas entry 75, dust removal section 76 and slurry storage tank 77, tower body top-down is provided with exhanst gas outlet, washing layer, flue gas entry, dust removal section and slurry storage tank in proper order and at the same axial interval, the flue gas outlet, A pneumatic high-efficiency dust and mist removing device is coaxially arranged on the tower body between the water washing layers;
the input end of the circulating water pump is connected with the pulp storage tank, the output end of the circulating water pump is connected with the input end of the water washing layer, and the output end of the water washing layer can downwards output dedusting cleaning water;
the slurry storage pool is connected with the input end of the plate-and-frame filter press through a slurry discharge pump, the output end of the plate-and-frame filter press comprises a mud cake output end 92 and a clean water output end 91, and the clean water output end is connected with the slurry storage pool.
This system is including smoldering cinder pond, hair-dryer, suction hood, draught fan, wet process gas wash tower, pneumatic high-efficient dust removal defroster, circulating water pump, fan pump, plate and frame filter press, and the raise dust is collected through hair-dryer + suction hood dual function, and the wet process gas wash tower removes dust for washing and pneumatic high-efficient dust removal defroster, utilizes plate and frame filter press to carry out desorption aquatic dust.
In this embodiment, the system still includes defroster rinse-system (not numbered in the figure), defroster wash water pump 10 and process water tank 11, the defroster rinse-system sets up in the tower body between pneumatic high-efficient dust removal defroster, the exhanst gas outlet, the process water tank is connected the setting through defroster wash water pump and defroster rinse-system, and defroster rinse-system can carry out the washing operation to pneumatic high-efficient dust removal defroster.
In this embodiment, the blowers are provided in two.
A method for treating dust in the slag dumping and dragging process of a steel slag hot stewing pool by using the treatment system comprises the following steps:
(1) high-temperature liquid steel slag generated in the steel-making process (such as a converter and an electric furnace) is put into or taken out of a slag stewing pool by using a crane, a large amount of raised dust is generated in the process, and the dust is blown towards the dust hood by using a blower;
(2) the dust generated in the slag dumping and slag salvaging processes of the slag stewing pool is conveyed to the wet dust removal tower through a (flue and) a draught fan under the dual functions of a blower and a dust hood;
(3) a washing layer is arranged in the wet dust removal tower, dust removal cleaning water in a water storage tank below the dust removal section is conveyed to the washing layer by a circulating water pump, and the washing layer is used for washing and removing dust from the dust-containing flue gas;
(4) after primary dust removal through water washing, the flue gas enters a pneumatic high-efficiency dust removal demister at the upper part of a dust removal tower, dust-containing flue gas is further efficiently removed, and the treated flue gas is discharged from a flue gas outlet at the top of the tower;
(5) along with continuous circulation, the dust removal cleaning water washes dust-containing flue gas, dust in the water storage pool is enriched, after certain concentration is reached (which can be automatically determined according to operation experience), the dust-containing concentrated solution is conveyed to a plate-and-frame filter press through a slurry discharge pump, the plate-and-frame filter press performs solid-liquid separation on the concentrated solution, a filter cake is produced and transported outwards, and the clean water is recycled to the wet method dust removal tower.
Although the embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that: various substitutions, changes and modifications are possible without departing from the spirit and scope of the invention and the appended claims, and therefore the scope of the invention is not limited to the embodiments disclosed.
Claims (4)
1. The utility model provides a slag-dumping and dragging process raise dust processing system in steel slag hot stewing pond which characterized in that: the system comprises a slag stewing pool, a blower, a dust hood, an induced draft fan, a wet dedusting tower, a pneumatic high-efficiency dedusting demister, a circulating water pump, a slurry discharge pump and a plate-and-frame filter press, wherein the top of the slag stewing pool is movably connected with a slag stewing pool cover which is connected with the dust hood, the blower is arranged on one side opposite to the input end of the dust hood at intervals, the output end of the dust hood is connected with a flue gas inlet of the wet dedusting tower through the induced draft fan, the wet dedusting tower comprises a tower body, a flue gas outlet, a washing layer, a flue gas inlet, a dedusting section and a slurry storage pool, the tower body is sequentially and coaxially provided with the flue gas outlet, the washing layer, the flue gas inlet, the dedusting section and the slurry storage pool at intervals from top to bottom, and the pneumatic high-efficiency dedusting demister is coaxially arranged on the tower body between the flue gas outlet and the washing layer;
the input end of the circulating water pump is connected with the pulp storage tank, the output end of the circulating water pump is connected with the input end of the water washing layer, and the output end of the water washing layer can downwards output dedusting cleaning water;
the slurry storage pool is connected with the input end of the plate-and-frame filter press through a slurry discharge pump, the output end of the plate-and-frame filter press comprises a mud cake output end and a clean water output end, and the clean water output end is connected with the slurry storage pool.
2. The dust treatment system in the slag dumping and dragging process of the steel slag hot stewing pond according to claim 1 is characterized in that: the system further comprises a demister flushing system, a demister flushing pump and a process water tank, wherein the demister flushing system is arranged in the tower body between the pneumatic high-efficiency dust removal demister and the flue gas outlet, the process water tank is connected with the demister flushing system through the demister flushing pump, and the demister flushing system can flush the pneumatic high-efficiency dust removal demister.
3. The dust treatment system in the slag dumping and dragging process of the steel slag hot stewing pond according to claim 1 or 2 is characterized in that: the hair dryer sets up two.
4. A method for treating dust generated in the deslagging and slag-salvaging process of a steel slag hot-braising pool by using the treatment system as claimed in any one of claims 1 to 3, is characterized in that: the method comprises the following steps:
(1) high-temperature liquid steel slag generated in the steelmaking process is put into or taken out of a slag stewing pool by a crane, dust can be generated in the process, and dust is blown towards a dust hood by a blower;
(2) the dust generated in the slag dumping and slag salvaging processes of the slag stewing pool is conveyed to the wet dust removal tower through the induced draft fan under the double functions of the blower and the dust hood;
(3) a washing layer is arranged in the wet dust removal tower, dust removal cleaning water in a water storage tank below the dust removal section is conveyed to the washing layer by a circulating water pump, and the washing layer is used for washing and removing dust from the dust-containing flue gas;
(4) after primary dust removal through water washing, the flue gas enters a pneumatic high-efficiency dust removal demister at the upper part of a dust removal tower, dust-containing flue gas is further efficiently removed, and the treated flue gas is discharged from a flue gas outlet at the top of the tower;
(5) along with continuous circulation, the dust removal cleaning water washes dust-containing flue gas, dust in the water storage pool is enriched, the dust-containing concentrated solution is conveyed to a plate-and-frame filter press through a slurry discharge pump, the plate-and-frame filter press performs solid-liquid separation on the concentrated solution to generate a filter cake for outward transportation, and the clear water is recycled to the wet method dust removal tower for reuse.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111202860.XA CN113893627A (en) | 2021-10-15 | 2021-10-15 | Dust treatment system and method in slag dumping and dragging process of steel slag hot-stewing pool |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111202860.XA CN113893627A (en) | 2021-10-15 | 2021-10-15 | Dust treatment system and method in slag dumping and dragging process of steel slag hot-stewing pool |
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| CN113893627A true CN113893627A (en) | 2022-01-07 |
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| DE2416195A1 (en) * | 1973-04-05 | 1974-10-24 | Universal Oil Prod Co | DUST FILTER |
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| CN112121567A (en) * | 2020-10-15 | 2020-12-25 | 航天环境工程有限公司 | Dedusting treatment system and method for flue gas of steel slag hot stewing pool |
| CN213134425U (en) * | 2020-06-05 | 2021-05-07 | 新兴河北工程技术有限公司 | Steel slag hot-braising dust collecting device |
| CN113230831A (en) * | 2021-05-11 | 2021-08-10 | 云南皓普工程技术有限公司 | System and method for washing, arsenic removal and purification of nonferrous smelting flue gas through adiabatic evaporation and cooling |
| CN216418769U (en) * | 2021-10-15 | 2022-05-03 | 航天环境工程有限公司 | Slag dumping and slag fishing process raise dust treatment system for steel slag hot-stewing pool |
-
2021
- 2021-10-15 CN CN202111202860.XA patent/CN113893627A/en not_active Withdrawn
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2416195A1 (en) * | 1973-04-05 | 1974-10-24 | Universal Oil Prod Co | DUST FILTER |
| CN102451609A (en) * | 2010-10-20 | 2012-05-16 | 中国石油化工股份有限公司 | Pneumatic ammonia method flue gas desulfurizing and dedusting process |
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| CN213134425U (en) * | 2020-06-05 | 2021-05-07 | 新兴河北工程技术有限公司 | Steel slag hot-braising dust collecting device |
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| CN113230831A (en) * | 2021-05-11 | 2021-08-10 | 云南皓普工程技术有限公司 | System and method for washing, arsenic removal and purification of nonferrous smelting flue gas through adiabatic evaporation and cooling |
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Application publication date: 20220107 |