CN212492187U - Wet dust removal device for steelmaking slag-stewing smoke dust - Google Patents
Wet dust removal device for steelmaking slag-stewing smoke dust Download PDFInfo
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- CN212492187U CN212492187U CN202021314441.6U CN202021314441U CN212492187U CN 212492187 U CN212492187 U CN 212492187U CN 202021314441 U CN202021314441 U CN 202021314441U CN 212492187 U CN212492187 U CN 212492187U
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Abstract
A wet dust removal device for steelmaking slag-stewing smoke dust belongs to the technical field of smoke dust treatment. The device comprises a collecting cover, a dust removal vertical pipe, a dust removal inclined pipe, a wet dust collector, a fan, a chimney, a main water supply pipe slag stewing pool and the like. The components 1-20 form a flue gas dust removal system, and a connected three-level wet type filtration high-efficiency dust remover technology is adopted; and the water supply system is used for meeting the metal water film filtering water supply requirement of the fine filtering section of the wet dust collector and the cleaning water supply requirement of the fan impeller. The wet dust removal system has the advantages that the technology of the integrated three-level wet-type filtering high-efficiency dust remover is adopted, the wet dust removal process for the steelmaking smoldering slag moisture-containing smoke dust is realized, the problem that the dust emission of the conventional wet dust removal system cannot reach the standard is solved, the technology of recycling water resources according to the quality is adopted, the water consumption is reduced, the operation cost is reduced, the zero emission of sewage is realized, and the environmental pollution is reduced.
Description
Technical Field
The utility model belongs to the technical field of the smoke and dust is administered, in particular to a wet dedusting device for steelmaking smoldering slag smoke and dust.
Background
The smoke dust generated by the steelmaking slag stewing process mainly comprises the following components: CaO, SiO2Particulate dust such as MgO, S, MnO and the like and a large amount of water vapor are discharged in an unorganized way in many enterprises at present, and slag is produced in a cross-region mannerThe mist is diffused, the atmospheric environment is seriously influenced, and meanwhile, the diffused steam corrodes the steel structure, so that potential safety hazards exist.
At present, the ecological environment department, "iron and steel enterprises low emission reconstruction working scheme (solicited comments drafts)"; the new-built (including the relocation) steel project is required to reach the ultra-low emission level, and the ultra-low emission limit value of the dust particles is required to reach not more than 10mg/Nm 3; by the end of 2025, iron and steel enterprises with modification conditions in the country strive to achieve ultra-low emissions. In 2017, the national environmental protection department publishes a standard modification bill (a petition suggestion) aiming at the emission standard of atmospheric pollutants in the steel-making industry (GB 28664-. From the current situation, the part of the water-containing smoke dust is treated to meet the requirement of ultra-low emission, and certain technical problems exist.
At present, some large national enterprise steel plants make organized emission treatment measures, and the implemented technical schemes mainly comprise three types: the first is that the mode of direct high-altitude emission is adopted after the moisture-containing flue gas is collected, the system is simple, but the emission of particulate matters can not meet the requirement of environmental protection; secondly, a washing tower spraying device is adopted to treat dust in the flue gas in a spraying and washing mode, the dedusting efficiency is low, and the ultralow emission requirement of less than or equal to 10mg/Nm3 cannot be met; the third is a washing tower spraying pre-dedusting and wet electric dedusting technology, the mode is used for the first time in first Steel Jingtangtang, the using effect cannot be checked, and the defects of complex system, large water consumption, increased sewage treatment difficulty, high one-time investment and the like exist.
In summary, the main problems of the prior art are:
1. the adoption of the unorganized emission and the conventional wet dust removal technology cannot meet the requirement of ultra-low emission of dust.
2. The technology of adopting the washing tower to spray and pre-remove dust and wet electric dust removal has the defects of complex system, large floor area, large water consumption, high operating cost, increased sewage treatment difficulty, high one-time investment and the like.
Disclosure of Invention
An object of the utility model is to provide a wet process dust collector for steelmaking smoldering sediment smoke and dust has solved the unable up to standard scheduling problem of dust emission when adopting unorganized emission and conventional wet process dust removal technique, has shortened dust pelletizing system treatment procedure, reduces area, carries out quality-based recycle to the water resource simultaneously, reduces the water consumption, reduces the working costs, has realized sewage "zero release", reduces environmental pollution.
A wet dust removal device for steelmaking slag-stewing smoke dust comprises a collecting cover 1, a dust removal vertical pipe 2, a dust removal inclined pipe 3, a dust removal inclined pipe spray water inlet 4, a dust removal inclined pipe water outlet 5, a wet dust remover smoke inlet 6, a wet dust remover 7, a wet dust remover smoke outlet 8, a wet dust remover second water inlet 9, a wet dust remover first water inlet 10, a wet dust remover third water inlet 11, a wet dust remover fine filtering section water outlet 12, a wet dust remover fourth water inlet 13, a wet dust remover total water outlet 14, a fan inlet smoke pipeline 15, a fan 16, a fan impeller cleaning water inlet 17, a fan impeller cleaning water outlet 18, a fan outlet smoke pipeline 19, a smoke cylinder 20, a total water supply pipe 21, a first water supply pipe 22, a second water supply pipe 23, a first spray pipe 24, a first spray pump 25, a second spray pipe 26, a third spray pipe 27, a first spray pipe 27, a second spray pipe 24, a second spray pipe, A first drain pipe 28, a second drain pipe 29, a main drain 30, a sewage pool 31, a communicating pipe 32, a sedimentation tank 33, a fourth spraying pipe 34, a second spraying pump 35, a fifth spraying pipe 36, a sixth spraying pipe 37, a first sewage pipe 38, a sewage pump 39, a second sewage pipe 40 and a slag stewing pool 41; the device comprises a collecting cover 1, a dust removing vertical pipe 2, a dust removing inclined pipe 3, a dust removing inclined pipe spray water inlet 4, a dust removing inclined pipe water outlet 5, a wet type dust collector flue gas inlet 6, a wet type dust collector 7, a wet type dust collector flue gas outlet 8, a wet type dust collector second water inlet 9, a wet type dust collector first water inlet 10, a wet type dust collector third water inlet 11, a wet type dust collector fine filtering section water outlet 12, a wet type dust collector fourth water inlet 13, a wet type dust collector total water outlet 14, a fan inlet flue gas pipeline 15, a fan 16, a fan impeller cleaning water inlet 17, a fan impeller cleaning water outlet 18, a fan outlet flue gas pipeline 19 and a chimney 20, wherein the dust removing system comprises the device; the total water supply pipe 21, the first water supply pipe 22 and the second water supply pipe 23 constitute a water supply system of the apparatus; the first spraying water system of the device is composed of a first spraying pipe 24, a first spraying pump 25, a second spraying pipe 26 and a third spraying pipe 27; the first drainage pipe 28, the second drainage pipe 29, the main drainage ditch 30, the sewage tank 31, the communicating pipe 32 and the sedimentation tank 33 form a sewage collecting and sedimentation system of the device; a fourth spray pipe 34, a second spray pump 35, a fifth spray pipe 36 and a sixth spray pipe 37 form a second spray water system of the device; the first sewage pipe 38, the sewage pump 39, the second sewage pipe 40 and the slag stewing pond 41 form a sewage recycling system of the device; the collecting cover 1 is positioned above the slag stewing pond 41, the flue gas outlet of the collecting cover 1 is connected with the air inlet end of the dust removing vertical pipe 2, the air outlet end of the dust removing vertical pipe 2 is connected with the air inlet end of the dust removing inclined pipe 3, the spraying water inlet 4 of the dust removing inclined pipe is positioned at the highest position of the dust removing inclined pipe 3, the water outlet 5 of the dust removing inclined pipe is positioned at the lowest position of the dust removing inclined pipe 3, the air outlet end of the dust removing inclined pipe 3 is connected with the flue gas inlet 6 of the wet dust collector, the flue gas outlet 8 of the wet dust collector is connected with the flue gas pipeline 15 of the fan inlet, the other end of the flue gas pipeline 15 of the fan inlet is connected with the air inlet of the fan 16, the air outlet of the fan 16 is connected with the flue gas pipeline 19 of the fan outlet, the other end of the flue gas pipeline 19 of the fan outlet is connected with the air inlet of the chimney 20, the first water inlet 10 of the wet dust collector is positioned at the outer wall of the, a third water inlet 11 of the wet dust collector is positioned at the outer wall of the lower box body of the fine filtering section of the wet dust collector 7, a fourth water inlet 13 of the wet dust collector is positioned at the outer wall of the middle box body between the first-stage filtering section and the second-stage filtering section of the wet dust collector 7, a water outlet 12 of the fine filtering section of the wet dust collector is positioned at the outer wall of the lower ash hopper of the fine filtering section of the wet dust collector 7, a total water outlet 14 of the wet dust collector is connected with a total water drainage ditch 30, the water outlet end of the total water supply pipe 21 is respectively connected with the water inlet end of a first water supply pipe 22 and the water inlet end of a second water supply pipe 23, the water outlet end of the first water supply pipe 22 is connected with the first water inlet 10 of the wet dust collector, the water outlet end of the second water supply pipe 23 is connected with a cleaning water inlet 17 of a fan impeller, the water absorbing end of a first spray pipe 24 is connected with the water outlet 12 of the fine filtering section of, the water outlet end of the second spray pipe 26 is connected with the second water inlet 9 of the wet dust collector, the water inlet end of the third spray pipe 27 is connected out from the pipeline of the second spray pipe 26, the other end is connected with the third water inlet 11 of the wet dust collector, one end of the first drainage pipe 28 is connected with the fan impeller cleaning water outlet 18, the other end is connected with the main drainage ditch 30, one end of the second drainage pipe 29 is connected with the inclined dust-collecting pipe water outlet 5, the other end is connected with the main drainage ditch 30, the starting end of the main drainage ditch 30 is communicated with the main drainage port 14 of the wet dust collector, the drainage end of the main drainage ditch 30 is connected into the sewage pool 31, the communicating pipe 32 is positioned below the water level line on the pool wall between the sewage pool 31 and the sedimentation pool 33, the water suction end of the fourth spray pipe 34 is communicated with the sedimentation pool 33, the other end is connected with the water inlet of the second spray pump 35, the water outlet of the second, the water outlet end of the fifth spray pipe 36 is connected with the fourth water inlet 13 of the wet dust collector, the water inlet end of the sixth spray pipe 37 is connected out from the pipeline of the fifth spray pipe 36, and the other end of the sixth spray pipe is connected with the spraying water inlet 4 of the dust collection inclined pipe; the water suction end of the first sewage pipe 38 is communicated with the sewage tank 31, the other end of the first sewage pipe is connected with the water inlet of the sewage pump 39, the water outlet of the sewage pump 39 is connected with the water inlet end of the second sewage pipe 40, and the water outlet end of the second sewage pipe 40 is positioned above the high water level of the slag stewing pond 41.
The sewage tank 31 and the sedimentation tank 33 are of underground concrete structures.
The application method of the dust removal device comprises the following specific steps and parameters:
1. firstly, the water supply system of the device is operated, the water quality of the water supply system is industrial clean ring water and is divided into two branches, one branch enters the fine filtering section of the wet dust collector 7, a water film is formed on the surface of the metal filter bag, the double filtration of the water film and the metal filter bag is realized, and the water film and the metal filter bag are filtered every 10000m3The water supply amount of the/h dust removal air quantity is controlled to be less than or equal to 4t/h, the water spraying pressure is greater than or equal to 0.2MPa, the other path is used for cleaning an impeller of the fan 16 to ensure the stable operation of the fan, the water supply amount is controlled to be less than or equal to 2t/h, the water spraying pressure is greater than or equal to 0.2MPa, the impeller cleaning sewage of the fan 16 is cleaned by the impeller of the fan to clean a sewage18, through the first drain pipe 28 into the main drain 30 and into the sump 31.
2. After the water supply system normally operates, the first spray pump 25 is started, the first spray water system of the device is operated, and clean water with less suspended matters in the ash bucket at the lower part of the fine filtering section of the wet dust collector 7 is utilized, so that the self-spraying circulating water requirement at the lower part of the fine filtering section of the wet dust collector 7 is met, the spraying water supply requirement of the metal wire nets at the upper parts of the primary filtering section and the secondary filtering section of the wet dust collector 7 is met, and the fresh water consumption of the system can be saved. Per 10000m3The self-spraying circulating water quantity at the lower part of the fine filtering section of the wet dust collector 7 for removing dust wind quantity is controlled to be less than 20t/h, the water spraying pressure is more than or equal to 0.2MPa, the spraying water supply quantity at the upper parts of the primary filtering section and the secondary filtering section of the wet dust collector 7 for removing dust is controlled to be less than or equal to 4t/h, and the water spraying pressure is more than or equal to 0.2 MPa. The sprayed water flows into a sewage tank 31 through a main drainage ditch 30 via a main drainage ditch 14 in an ash hopper at the lower part of the wet dust collector 7.
3. After the first spraying water system operates normally, a second spraying pump 35 is started to operate a second spraying water system of the device; utilize the water after the sedimentation tank 33 sinks, satisfy wet dust collector 7 one-level filter stage and second grade filter stage lower part on the one hand and spray the water supply requirement from spraying, on the other hand satisfies the 3 inner chambers of dust removal pipe chute and sprays the water supply requirement, and the primary function is to wash dust removal pipeline bottom surface dust precipitate, prevents that dust removal pipeline bottom from producing the dust and hardening, can play preliminary cooling condensation and dust removal effect in advance to the moisture smoke and dust simultaneously again, can further practice thrift the new water quantity of system. Per 10000m3The amount of self-spraying circulating water at the lower parts of a primary filtering section and a secondary filtering section of a wet dust collector 7 for removing dust air volume is controlled to be less than or equal to 15t/h, and the water spraying pressure is more than or equal to 0.2 MPa; the water supply amount of each spraying point sprayed in the inner cavity of the dust removal inclined pipe 3 is controlled to be less than or equal to 10L/min, and the water spraying pressure is more than or equal to 0.2 MPa. The water sprayed by the wet dust collector 7 flows into the sewage tank 31 through the main drainage ditch 30 through the main drainage ditch 14 in the ash hopper at the lower part of the wet dust collector 7, and the water sprayed by the inner cavity of the inclined dedusting pipe 3 flows into the main drainage ditch 30 through the second drainage pipe 29 by the inclined dedusting pipe drainage ditch 5 and then flows into the sewage tank 31.
4. After the second spraying water system operates normally, the wind is startedA machine 16; after the water-containing smoke dust generated in the slag stewing process of the steel-making steel slag is trapped by the trapping cover 1, the dust concentration of the water-containing smoke dust is 2-6g/Nm3When the temperature is 50-80 ℃, the moisture-containing smoke firstly enters a wet dust collector 7 through a dust collection vertical pipe 2 and a dust collection inclined pipe 3; after the water-containing smoke dust is sprayed with water in the dust removal inclined pipe 3, condensation cooling and preliminary pre-dust removal effects on the water-containing smoke dust can be properly achieved. The wet dust collector 7 adopts a conjoined three-level wet filtering high-efficiency dust collector, the water-containing smoke dust in the wet dust collector 7 firstly passes through the spraying washing of the primary and secondary filtering sections and the pre-dust collection of the metal filter screen, and the processes of wetting, condensation, sedimentation and the like of the dust particles can occur when the dust particles in the smoke gas meet sprayed water drops, so that the dust particles are separated from the gas, and the purpose of pre-dust collection is achieved; and then the fine dust is removed by spray washing of a fine filtering section and a water film metal filter bag, so that the tiny dust in the flue gas is further separated from the gas, and the dust removal efficiency of a wet dust remover 7 is more than or equal to 99.9 percent.
5. The dust emission index of the flue gas after dust removal by the wet dust collector 7 meets the requirement that the emission index is less than or equal to 10mg/Nm3The flue gas is discharged from the high altitude after flowing into the chimney 20 through the fan 16 and the fan outlet flue gas pipeline 19, thus finishing the flue gas treatment.
6. The sewage in the sewage tank 31 is completely sent to the slag stewing tank 41 through the sewage pump 39 and is used for steelmaking slag stewing.
The utility model has the advantages that: by adopting the integrated three-stage wet-type filtration high-efficiency dust remover technology, the dust removing device has the advantages of simple treatment flow, small occupied area, high dust removing efficiency and stable performance operation index, and solves the problem that the dust emission cannot reach the standard by adopting the unorganized emission and the conventional wet dust removing technology; by adopting the technology of recycling water resources according to the quality, the new water consumption is saved by more than 50%, and the operating cost is reduced; the dust removal system does not produce redundant sewage, realizes zero discharge of the sewage and reduces environmental pollution.
Drawings
Fig. 1 is a schematic structural diagram of the device. Wherein, the collecting cover 1, the vertical dedusting pipe 2, the inclined dedusting pipe 3, the spray water inlet 4, the inclined dedusting pipe water outlet 5, the flue gas inlet 6, the wet deduster 7, the flue gas outlet 8, the second water inlet 9, the first water inlet 10, the third water inlet 11, the fine filtering section water outlet 12, the fourth water inlet 13, the total water outlet 14, the flue gas pipeline 15, the fan 16, the fan impeller cleaning water inlet 17, the fan impeller cleaning water outlet 18, the flue gas pipeline 19, the chimney 20, the total water supply pipe 21, the first water supply pipe 22, the second water supply pipe 23, the first spray pipe 24, the first spray pump 25, the second spray pipe 26, the third spray pipe 27, the first water discharge pipe 28, the second water discharge pipe 29 and the total water discharge ditch 30, The sewage pool 31, the communicating pipe 32, the sedimentation tank 33, the fourth spray pipe 34, the second spray pump 35, the fifth spray pipe 36, the sixth spray pipe 37, the first sewage pipe 38, the sewage pump 39, the second sewage pipe 40 and the slag stewing pond 41.
Detailed Description
A wet dust removal device for steelmaking slag-stewing smoke dust comprises a collecting cover 1, a dust removal vertical pipe 2, a dust removal inclined pipe 3, a dust removal inclined pipe spray water inlet 4, a dust removal inclined pipe water outlet 5, a wet dust remover smoke inlet 6, a wet dust remover 7, a wet dust remover smoke outlet 8, a wet dust remover second water inlet 9, a wet dust remover first water inlet 10, a wet dust remover third water inlet 11, a wet dust remover fine filtering section water outlet 12, a wet dust remover fourth water inlet 13, a wet dust remover total water outlet 14, a fan inlet smoke pipeline 15, a fan 16, a fan impeller cleaning water inlet 17, a fan impeller cleaning water outlet 18, a fan outlet smoke pipeline 19, a smoke cylinder 20, a total water supply pipe 21, a first water supply pipe 22, a second water supply pipe 23, a first spray pipe 24, a first spray pump 25, a second spray pipe 26, a third spray pipe 27, a first spray pipe 27, a second spray pipe 24, a second spray pipe, A first drain pipe 28, a second drain pipe 29, a main drain 30, a sewage pool 31, a communicating pipe 32, a sedimentation tank 33, a fourth spraying pipe 34, a second spraying pump 35, a fifth spraying pipe 36, a sixth spraying pipe 37, a first sewage pipe 38, a sewage pump 39, a second sewage pipe 40 and a slag stewing pool 41; the device comprises a collecting cover 1, a dust removing vertical pipe 2, a dust removing inclined pipe 3, a dust removing inclined pipe spray water inlet 4, a dust removing inclined pipe water outlet 5, a wet type dust collector flue gas inlet 6, a wet type dust collector 7, a wet type dust collector flue gas outlet 8, a wet type dust collector second water inlet 9, a wet type dust collector first water inlet 10, a wet type dust collector third water inlet 11, a wet type dust collector fine filtering section water outlet 12, a wet type dust collector fourth water inlet 13, a wet type dust collector total water outlet 14, a fan inlet flue gas pipeline 15, a fan 16, a fan impeller cleaning water inlet 17, a fan impeller cleaning water outlet 18, a fan outlet flue gas pipeline 19 and a chimney 20, wherein the dust removing system comprises the device; the total water supply pipe 21, the first water supply pipe 22 and the second water supply pipe 23 constitute a water supply system of the apparatus; the first spraying water system of the device is composed of a first spraying pipe 24, a first spraying pump 25, a second spraying pipe 26 and a third spraying pipe 27; the first drainage pipe 28, the second drainage pipe 29, the main drainage ditch 30, the sewage tank 31, the communicating pipe 32 and the sedimentation tank 33 form a sewage collecting and sedimentation system of the device; a fourth spray pipe 34, a second spray pump 35, a fifth spray pipe 36 and a sixth spray pipe 37 form a second spray water system of the device; the first sewage pipe 38, the sewage pump 39, the second sewage pipe 40 and the slag stewing pond 41 form a sewage recycling system of the device; the collecting cover 1 is positioned above the slag stewing pond 41, the flue gas outlet of the collecting cover 1 is connected with the air inlet end of the dust removing vertical pipe 2, the air outlet end of the dust removing vertical pipe 2 is connected with the air inlet end of the dust removing inclined pipe 3, the spraying water inlet 4 of the dust removing inclined pipe is positioned at the highest position of the dust removing inclined pipe 3, the water outlet 5 of the dust removing inclined pipe is positioned at the lowest position of the dust removing inclined pipe 3, the air outlet end of the dust removing inclined pipe 3 is connected with the flue gas inlet 6 of the wet dust collector, the flue gas outlet 8 of the wet dust collector is connected with the flue gas pipeline 15 of the fan inlet, the other end of the flue gas pipeline 15 of the fan inlet is connected with the air inlet of the fan 16, the air outlet of the fan 16 is connected with the flue gas pipeline 19 of the fan outlet, the other end of the flue gas pipeline 19 of the fan outlet is connected with the air inlet of the chimney 20, the first water inlet 10 of the wet dust collector is positioned at the outer wall of the, a third water inlet 11 of the wet dust collector is positioned at the outer wall of the lower box body of the fine filtering section of the wet dust collector 7, a fourth water inlet 13 of the wet dust collector is positioned at the outer wall of the middle box body between the first-stage filtering section and the second-stage filtering section of the wet dust collector 7, a water outlet 12 of the fine filtering section of the wet dust collector is positioned at the outer wall of the lower ash hopper of the fine filtering section of the wet dust collector 7, a total water outlet 14 of the wet dust collector is connected with a total water drainage ditch 30, the water outlet end of the total water supply pipe 21 is respectively connected with the water inlet end of a first water supply pipe 22 and the water inlet end of a second water supply pipe 23, the water outlet end of the first water supply pipe 22 is connected with the first water inlet 10 of the wet dust collector, the water outlet end of the second water supply pipe 23 is connected with a cleaning water inlet 17 of a fan impeller, the water absorbing end of a first spray pipe 24 is connected with the water outlet 12 of the fine filtering section of, the water outlet end of the second spray pipe 26 is connected with the second water inlet 9 of the wet dust collector, the water inlet end of the third spray pipe 27 is connected out from the pipeline of the second spray pipe 26, the other end is connected with the third water inlet 11 of the wet dust collector, one end of the first drainage pipe 28 is connected with the fan impeller cleaning water outlet 18, the other end is connected with the main drainage ditch 30, one end of the second drainage pipe 29 is connected with the inclined dust-collecting pipe water outlet 5, the other end is connected with the main drainage ditch 30, the starting end of the main drainage ditch 30 is communicated with the main drainage port 14 of the wet dust collector, the drainage end of the main drainage ditch 30 is connected into the sewage pool 31, the communicating pipe 32 is positioned below the water level line on the pool wall between the sewage pool 31 and the sedimentation pool 33, the water suction end of the fourth spray pipe 34 is communicated with the sedimentation pool 33, the other end is connected with the water inlet of the second spray pump 35, the water outlet of the second, the water outlet end of the fifth spray pipe 36 is connected with the fourth water inlet 13 of the wet dust collector, the water inlet end of the sixth spray pipe 37 is connected out from the pipeline of the fifth spray pipe 36, and the other end of the sixth spray pipe is connected with the spraying water inlet 4 of the dust collection inclined pipe; the water suction end of the first sewage pipe 38 is communicated with the sewage tank 31, the other end of the first sewage pipe is connected with the water inlet of the sewage pump 39, the water outlet of the sewage pump 39 is connected with the water inlet end of the second sewage pipe 40, and the water outlet end of the second sewage pipe 40 is positioned above the high water level of the slag stewing pond 41.
The sewage tank 31 and the sedimentation tank 33 are of underground concrete structures.
Please refer to example 1 for the application method of the dust removing device.
Example 1
A use method of a wet dust removal device for steelmaking slag-stewing smoke dust comprises the following specific steps and parameters:
1. firstly, a water supply system of the device is operated, the water quality of the water supply system is industrial clean ring water and is divided into two branches, one branch enters a fine filtering section of a wet dust collector 7, a water film is formed on the surface of a metal filter bag, the double filtration of the water film and the metal filter bag is realized, and when the steelmaking slag stewing wet dust collector system is used for treating the air quantity of 50000m3When the pressure is over the set pressure, the water supply amount is 20t/h, and the water spraying pressure is more than or equal to 0.2 MPa; the other path is used for cleaning an impeller of the fan 16, so that the fan can run stably, the water supply amount is 2t/h, and the water spraying pressure is more than or equal to 0.2 MPa. The impeller cleaning sewage of the fan 16 flows from the fan impeller cleaning sewage discharge outlet 18 into the main drainage ditch 30 through the first drainage pipe 28 and then flows into the sewage tank 31.
2. After the water supply system operates normally, starting a first spray pump 25 to operate a first spray water system of the device; the clean water with less suspended matters in the ash bucket at the lower part of the fine filtering section of the wet dust collector 7 is utilized, on one hand, the requirement of self-spraying circulating water at the lower part of the fine filtering section of the wet dust collector 7 is met, on the other hand, the requirement of spraying water supply by the metal wire nets at the upper parts of the primary filtering section and the secondary filtering section of the wet dust collector 7 is met, and the consumption of fresh water of the system can be saved. The self-spraying circulating water quantity at the lower part of the fine filtering section of the wet dust collector 7 is controlled to be 90t/h, the water spraying pressure is more than or equal to 0.2MPa, the spraying water supply quantity of the wire mesh at the upper parts of the primary filtering section and the secondary filtering section of the wet dust collector 7 is 20t/h, and the water spraying pressure is more than or equal to 0.2 MPa. The sprayed water flows into a sewage tank 31 through a main drainage ditch 30 via a main drainage ditch 14 in an ash hopper at the lower part of the wet dust collector 7.
3. After the first spraying water system operates normally, a second spraying pump 35 is started to operate a second spraying water system of the device; utilize the water after the sedimentation tank 33 sinks, satisfied 7 one-level filter stages of wet dust collector and second grade filter stage lower parts on the one hand and sprayed the water supply requirement, on the other hand satisfies 3 inner chambers of dust removal pipe chute and sprays the water supply requirement, and the primary function is to wash dust removal pipeline bottom surface dust precipitate, prevents that the dust removal pipeline bottom from producing the dust and hardening, can play preliminary cooling condensation and dust removal effect in advance to the moisture smoke and dust simultaneously again, can further practice thrift the new water quantity of system. The self-spraying circulating water quantity at the lower parts of the primary filtering section and the secondary filtering section of the wet dust collector 7 is 75t/h, and the water spraying pressure is more than or equal to 0.2 MPa; the water supply amount of each spraying point sprayed in the inner cavity of the dust removal inclined pipe 3 is controlled to be less than or equal to 10L/min, and the water spraying pressure is more than or equal to 0.2 MPa. The water sprayed by the wet dust collector 7 flows into the sewage tank 31 through the main drainage ditch 30 through the main drainage ditch 14 in the ash hopper at the lower part of the wet dust collector 7, and the water sprayed by the inner cavity of the inclined dedusting pipe 3 flows into the main drainage ditch 30 through the second drainage pipe 29 by the inclined dedusting pipe drainage ditch 5 and then flows into the sewage tank 31.
4. After the second spray water system operates normally, starting the fan 16; after the water-containing smoke dust generated in the slag stewing process of the steel-making steel slag is trapped by the trapping cover 1, the dust concentration of the water-containing smoke dust is 6g/m3When the temperature is 60 ℃, the moisture-containing smoke firstly enters a wet dust collector 7 through a dust collection vertical pipe 2 and a dust collection inclined pipe 3; after the water-containing smoke dust is sprayed with water in the dust removal inclined pipe 3, condensation cooling and preliminary pre-dust removal effects on the water-containing smoke dust can be properly achieved. The wet dust collector 7 adopts a conjoined three-level wet filtering high-efficiency dust collector, the water-containing smoke dust in the wet dust collector 7 firstly passes through the spraying washing of the primary and secondary filtering sections and the pre-dust collection of the metal filter screen, and the processes of wetting, condensation, sedimentation and the like of the dust particles can occur when the dust particles in the smoke gas meet sprayed water drops, so that the dust particles are separated from the gas, and the purpose of pre-dust collection is achieved; and then the fine dust is removed by spray washing of a fine filtering section and a water film metal filter bag, so that the tiny dust in the flue gas is further separated from the gas, the dust removal efficiency of a wet dust remover 7 is more than or equal to 99.9 percent, and the dust emission concentration after dust removal by the wet dust remover is as follows: y is2＝(1-99.9％)x6000＝6mg/Nm3。
5. The flue gas after dust removal by the wet dust collector 7 flows into the chimney 20 by the dust removal fan 16 through the fan outlet flue gas pipeline 19 and is discharged at high altitude, and the flue gas treatment is completed.
6. The sewage in the sewage tank 31 is completely sent into a slag stewing tank 41 by a sewage pump 39 and is used for steelmaking slag stewing.
Claims (2)
1. The wet dust removal device for the steelmaking slag-stewing smoke dust is characterized by comprising a collecting cover (1), a dust removal vertical pipe (2), a dust removal inclined pipe (3), a dust removal inclined pipe spraying water inlet (4), a dust removal inclined pipe water outlet (5), a wet dust collector smoke inlet (6), a wet dust collector (7), a wet dust collector smoke outlet (8), a wet dust collector second water inlet (9), a wet dust collector first water inlet (10), a wet dust collector third water inlet (11), a wet dust collector fine filtering section water outlet (12), a wet dust collector fourth water inlet (13), a wet dust collector total water outlet (14), a fan inlet smoke pipeline (15), a fan (16), a fan impeller cleaning water inlet (17), a fan impeller cleaning water outlet (18), a fan outlet smoke pipeline (19), a smoke pipe (20), The device comprises a main water supply pipe (21), a first water supply pipe (22), a second water supply pipe (23), a first spray pipe (24), a first spray pump (25), a second spray pipe (26), a third spray pipe (27), a first drainage pipe (28), a second drainage pipe (29), a main drainage ditch (30), a sewage pool (31), a communication pipe (32), a sedimentation tank (33), a fourth spray pipe (34), a second spray pump (35), a fifth spray pipe (36), a sixth spray pipe (37), a first sewage pipe (38), a sewage pump (39), a second sewage pipe (40) and a slag stewing pool (41); the device comprises a collecting cover (1), a dust removing vertical pipe (2), a dust removing inclined pipe (3), a dust removing inclined pipe spray water inlet (4), a dust removing inclined pipe water outlet (5), a wet type dust collector flue gas inlet (6), a wet type dust collector (7), a wet type dust collector flue gas outlet (8), a wet type dust collector second water inlet (9), a wet type dust collector first water inlet (10), a wet type dust collector third water inlet (11), a wet type dust collector fine filtering section water outlet (12), a wet type dust collector fourth water inlet (13), a wet type dust collector main water outlet (14), a fan inlet flue gas pipeline (15), a fan (16), a fan impeller cleaning water inlet (17), a fan impeller cleaning water outlet (18), a fan outlet flue gas pipeline (19) and a chimney (20), wherein a flue gas dust removing system of the device is formed by the collecting cover; the main water supply pipe (21), the first water supply pipe (22) and the second water supply pipe (23) form a water supply system of the device; a first spray water system of the device is composed of a first spray pipe (24), a first spray pump (25), a second spray pipe (26) and a third spray pipe (27); a first drainage pipe (28), a second drainage pipe (29), a main drainage ditch (30), a sewage tank (31), a communicating pipe (32) and a sedimentation tank (33) form a sewage collecting and sedimentation system of the device; a second spraying water system of the device is composed of a fourth spraying pipe (34), a second spraying pump (35), a fifth spraying pipe (36) and a sixth spraying pipe (37); a sewage recycling system of the device is composed of a first sewage pipe (38), a sewage pump (39), a second sewage pipe (40) and a slag stewing pool (41); the collecting cover (1) is positioned above the slag stewing pool (41), the flue gas outlet of the collecting cover (1) is connected with the air inlet end of the dust removing vertical pipe (2), the air outlet end of the dust removing vertical pipe (2) is connected with the air inlet end of the dust removing inclined pipe (3), the spraying water inlet (4) of the dust removing inclined pipe is positioned at the highest position of the dust removing inclined pipe (3), the water outlet end of the dust removing inclined pipe (3) is connected with the flue gas inlet (6) of the wet dust remover, the flue gas outlet (8) of the wet dust remover is connected with the flue gas pipeline (15) at the inlet of the fan, the other end of the flue gas pipeline (15) at the inlet of the fan is connected with the air inlet of the fan (16), the air outlet of the fan (16) is connected with the flue gas pipeline (19) at the outlet of the fan, the other end of the flue gas pipeline (19) at the outlet of the fan is connected with the air inlet of the flue pipe (20), the first water inlet (10) of the wet dust remover is positioned at the, a second water inlet (9) of the wet dust collector is positioned on the outer wall of the upper box body between the primary filtering section and the secondary filtering section of the wet dust collector (7), a third water inlet (11) of the wet dust collector is positioned on the outer wall of the lower box body of the fine filtering section of the wet dust collector (7), a fourth water inlet (13) of the wet dust collector is positioned on the outer wall of the middle box body between the primary filtering section and the secondary filtering section of the wet dust collector (7), a water outlet (12) of the fine filtering section of the wet dust collector is positioned on the outer wall of the ash hopper at the lower part of the fine filtering section of the wet dust collector (7), a total water outlet (14) of the wet dust collector is connected with a total water drainage ditch (30), the water outlet end of a total water supply pipe (21) is respectively connected with the water inlet end of a first water supply pipe (22) and the water inlet end of a second water supply pipe (23), the water outlet end of the first water supply pipe (, the water outlet end of a second water supply pipe (23) is connected with a cleaning water inlet (17) of a fan impeller, the water absorbing end of a first spray pipe (24) is connected with a water outlet (12) of a fine filtering section of the wet dust collector, the other end of the first spray pipe is connected with a water inlet of a first spray pump (25), the water outlet of the first spray pump (25) is connected with the water inlet end of a second spray pipe (26), the water outlet end of the second spray pipe (26) is connected with a second water inlet (9) of the wet dust collector, the water inlet end of a third spray pipe (27) is connected out from a pipeline of the second spray pipe (26), the other end of the third spray pipe is connected with a third water inlet (11) of the wet dust collector, one end of a first water drainage pipe (28) is connected with a cleaning water outlet (18) of the fan impeller, the other end of the first water drainage pipe is connected with a main drainage ditch (30), one end of the second water drainage pipe, the starting end of a main drainage ditch (30) is communicated with a main drainage port (14) of the wet dust collector, the drainage end of the main drainage ditch (30) is connected into a sewage tank (31), a communicating pipe (32) is positioned below the water level line on the wall between the sewage tank (31) and a sedimentation tank (33), the water absorbing end of a fourth spraying pipe (34) is communicated with the sedimentation tank (33), the other end of the fourth spraying pipe is connected with the water inlet of a second spraying pump (35), the water outlet of the second spraying pump (35) is connected with the water inlet end of a fifth spraying pipe (36), the water outlet end of the fifth spraying pipe (36) is connected with a fourth water inlet (13) of the wet dust collector, the water inlet end of the sixth spraying pipe (37) is connected out from the pipeline of the fifth spraying pipe (36), and the other end of the sixth spraying pipe is connected with a spraying water inlet (4) of the dust collector; the water suction end of the first sewage pipe (38) is communicated with the sewage pool (31), the other end of the first sewage pipe is connected with the water inlet of the sewage pump (39), the water outlet of the sewage pump (39) is connected with the water inlet end of the second sewage pipe (40), and the water outlet end of the second sewage pipe (40) is positioned above the high water level of the slag stewing pool (41).
2. The apparatus according to claim 1, characterized in that the lagoon (31) and the settling tank (33) are both underground concrete structures.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021314441.6U CN212492187U (en) | 2020-07-07 | 2020-07-07 | Wet dust removal device for steelmaking slag-stewing smoke dust |
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| CN202021314441.6U CN212492187U (en) | 2020-07-07 | 2020-07-07 | Wet dust removal device for steelmaking slag-stewing smoke dust |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111790235A (en) * | 2020-07-07 | 2020-10-20 | 北京首钢国际工程技术有限公司 | A wet dust removal device for steel-making slag slag dust |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111790235A (en) * | 2020-07-07 | 2020-10-20 | 北京首钢国际工程技术有限公司 | A wet dust removal device for steel-making slag slag dust |
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